/* Layout: sectional-chart study room — chart-paper ground, airspace blue/magenta ink, one reading column with a sticky element rail. */
:root{
  --paper:#F1F4F7; --surface:#FFFFFF; --ink:#0B2440; --muted:#526174; --line:#D5DDE6;
  --blue:#1373BE; --magenta:#9A2B76; --good:#2D7A4C; --bad:#B03737; --warn:#9A6A12;
  --chip:#E4EBF2;
  --sky:#F6F8FA; --e-fill:rgba(154,43,118,.07); --g-fill:rgba(45,122,76,.10);
  --b-fill:rgba(29,79,145,.14); --b-fill2:rgba(29,79,145,.24); --c-fill:rgba(154,43,118,.16); --d-fill:rgba(29,79,145,.10);
  --f-display:"Saira Condensed","Arial Narrow",Arial,sans-serif;
  --f-body:"Source Sans 3","Segoe UI",system-ui,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --paper:#0A1624; --surface:#112234; --ink:#E6EDF5; --muted:#97A8BB; --line:#24384D;
  --blue:#5AA9EE; --magenta:#E486C4; --good:#62C98E; --bad:#EE8080; --warn:#E3B45A; --chip:#1A2E44;
  --sky:#0F1D2C; --e-fill:rgba(228,134,196,.07); --g-fill:rgba(98,201,142,.08);
  --b-fill:rgba(122,169,234,.14); --b-fill2:rgba(122,169,234,.26); --c-fill:rgba(228,134,196,.16); --d-fill:rgba(122,169,234,.10);
  color-scheme:dark }}
:root[data-theme="dark"]{
  --paper:#0A1624; --surface:#112234; --ink:#E6EDF5; --muted:#97A8BB; --line:#24384D;
  --blue:#5AA9EE; --magenta:#E486C4; --good:#62C98E; --bad:#EE8080; --warn:#E3B45A; --chip:#1A2E44;
  --sky:#0F1D2C; --e-fill:rgba(228,134,196,.07); --g-fill:rgba(98,201,142,.08);
  --b-fill:rgba(122,169,234,.14); --b-fill2:rgba(122,169,234,.26); --c-fill:rgba(228,134,196,.16); --d-fill:rgba(122,169,234,.10);
  color-scheme:dark }
body{background:var(--paper);color:var(--ink);font-family:var(--f-body);font-size:17px;line-height:1.55}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:10;background:var(--surface)}
*{box-sizing:border-box}
a{color:var(--blue)}
button{font:inherit;color:inherit;cursor:pointer}
:focus-visible{outline:2px solid var(--magenta);outline-offset:2px}
.wrap{max-width:1040px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}

/* top bar */
.bar{position:sticky;top:env(safe-area-inset-top,0px);z-index:5;background:var(--surface);border-bottom:1px solid var(--line)}
.bar .wrap{display:flex;align-items:center;gap:16px;padding-block:10px;flex-wrap:wrap}
.brand{font-family:var(--f-display);font-weight:700;font-size:22px;letter-spacing:.02em;text-transform:uppercase;display:flex;align-items:center;gap:10px;background:none;border:0;padding:0}
.brand .mark{width:26px;height:26px;border:2px solid var(--blue);border-radius:50%;position:relative}
.brand .mark::after{content:"";position:absolute;inset:4px;border:2px dashed var(--magenta);border-radius:50%}
.nav{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}
.nav button{background:none;border:0;padding:6px 12px;border-radius:6px;font-weight:600;color:var(--muted)}
.nav button[aria-current="page"]{color:var(--ink);background:var(--chip)}
.nav button:hover{color:var(--ink)}

main{padding-block:28px 64px}
h1,h2,h3{font-family:var(--f-display);text-wrap:balance;line-height:1.15}
h1{font-size:clamp(34px,6vw,52px);font-weight:700;margin:0;letter-spacing:.005em}
h2{font-size:28px;font-weight:600;margin:0}
h3{font-size:21px;font-weight:600;margin:28px 0 8px}
.eyebrow{font-family:var(--f-mono);font-size:12.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.code{font-family:var(--f-mono);font-size:11.5px;font-weight:500;color:var(--magenta);background:color-mix(in srgb,var(--magenta) 10%,transparent);padding:1px 6px;border-radius:4px;white-space:nowrap;vertical-align:2px}
.muted{color:var(--muted)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:8px;border:1px solid var(--line);background:var(--surface);font-weight:600}
.btn:hover{border-color:var(--blue)}
.btn.primary{background:var(--blue);border-color:var(--blue);color:var(--surface)}
.btn.primary:hover{filter:brightness(1.08)}
.btn.danger{border-color:var(--bad);color:var(--bad)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}

/* home */
.hero{display:grid;grid-template-columns:1.4fr 1fr;gap:32px;align-items:end;padding-bottom:28px;border-bottom:2px solid var(--ink)}
.hero p{max-width:58ch;margin:12px 0 0;color:var(--muted)}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.stats div{background:var(--surface);padding:14px 12px}
.stats .n{font-family:var(--f-display);font-size:30px;font-weight:700;font-variant-numeric:tabular-nums;display:block;line-height:1.1}
.stats .l{font-size:13px;color:var(--muted)}
.hero .row{margin-top:20px}
.test-facts{display:flex;gap:24px;flex-wrap:wrap;margin:18px 0 0;font-size:14px;color:var(--muted)}
.test-facts b{color:var(--ink);font-family:var(--f-mono);font-weight:500}

.area{margin-top:36px}
.area-head{display:grid;grid-template-columns:auto 1fr auto;gap:14px;align-items:baseline}
.area-num{font-family:var(--f-display);font-size:40px;font-weight:700;color:var(--blue);line-height:1;min-width:52px}
.area-head h2{font-size:26px}
.weight{font-size:13px;color:var(--muted);text-align:right;white-space:nowrap}
.wbar{grid-column:2/4;height:6px;background:var(--chip);border-radius:3px;position:relative;overflow:hidden}
.wbar span{position:absolute;top:0;bottom:0;background:var(--blue);border-radius:3px;opacity:.85}
.tasks{margin-top:12px;border-top:1px solid var(--line)}
.task{display:grid;grid-template-columns:96px 1fr auto auto;gap:14px;align-items:center;padding:12px 4px;border-bottom:1px solid var(--line);background:none;border-left:0;border-right:0;border-top:0;width:100%;text-align:left}
.task:hover{background:var(--surface)}
.task .tc{font-family:var(--f-mono);font-size:12.5px;color:var(--muted)}
.task .tt{font-weight:600;min-width:0}
.task .tk{font-size:13px;color:var(--muted);white-space:nowrap}
.chip{font-size:12px;font-weight:600;padding:3px 9px;border-radius:999px;background:var(--chip);color:var(--muted);white-space:nowrap}
.chip.read{color:var(--blue);background:color-mix(in srgb,var(--blue) 14%,transparent)}
.chip.good{color:var(--good);background:color-mix(in srgb,var(--good) 15%,transparent)}
.chip.bad{color:var(--bad);background:color-mix(in srgb,var(--bad) 13%,transparent)}
.area-quiz{margin-top:10px;font-size:14px;background:none;border:0;color:var(--blue);font-weight:600;padding:4px 0}

/* lesson */
.crumbs{display:flex;gap:8px;align-items:center;font-size:14px;color:var(--muted);flex-wrap:wrap}
.crumbs button{background:none;border:0;padding:0;color:var(--blue);font-weight:600}
.lesson-head{padding:14px 0 22px;border-bottom:2px solid var(--ink)}
.lesson-head h1{font-size:clamp(30px,5vw,44px);margin-top:6px}
.obj{margin:10px 0 0;max-width:62ch}
.refs{margin:8px 0 0;font-size:14px;color:var(--muted)}
.lesson{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:40px;margin-top:8px}
.body{min-width:0;max-width:68ch}
.body p,.body li{color:var(--ink)}
.body ul,.body ol{padding-left:22px}
.body li{margin:4px 0}
.fact{border:1px solid var(--line);border-left:4px solid var(--magenta);background:var(--surface);padding:12px 16px;border-radius:0 8px 8px 0;margin:14px 0}
.fact ul{margin:6px 0}
.example{background:var(--surface);border:1px dashed var(--line);padding:10px 14px;border-radius:8px}
.numgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin:10px 0}
.numgrid div{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:12px}
.numgrid .n{display:block;font-family:var(--f-display);font-size:26px;font-weight:700;color:var(--blue);line-height:1.1}
.numgrid .l{font-size:14px;color:var(--muted)}
.table-wrap{overflow-x:auto;margin:10px 0;border:1px solid var(--line);border-radius:8px;background:var(--surface)}
table{border-collapse:collapse;width:100%;font-size:15px}
th,td{text-align:left;vertical-align:top;padding:9px 12px;border-bottom:1px solid var(--line)}
th{font-family:var(--f-display);font-weight:600;font-size:16px;letter-spacing:.02em;background:var(--chip)}
tr:last-child td{border-bottom:0}
pre.metar{font-family:var(--f-mono);font-size:14px;background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:12px 14px;overflow-x:auto;margin:6px 0}
.sample-label{font-size:13px;color:var(--muted);margin:8px 0 0}
.decode{list-style:none;padding-left:0!important}
.decode code{font-family:var(--f-mono);font-size:13px;color:var(--blue);display:inline-block;min-width:110px}
.airspace{-webkit-overflow-scrolling:touch;margin:14px 0;border:1px solid var(--line);border-radius:8px;overflow-x:auto;background:var(--sky)}
.airspace svg{display:block;width:100%;min-width:520px;height:auto}
.svgt{font-family:var(--f-display);font-weight:700;font-size:15px;fill:var(--ink)}
.svgs{font-family:var(--f-body);font-size:11.5px;fill:var(--muted)}
.alpha{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:6px;margin:12px 0}
.alpha span{background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:6px 8px;font-size:14px}
.alpha b{font-family:var(--f-display);font-size:18px;color:var(--magenta);margin-right:6px}

.rail{position:sticky;top:calc(env(safe-area-inset-top,0px) + 72px);align-self:start;display:flex;flex-direction:column;gap:14px}
.rail-box{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:14px}
.rail-box h4{margin:0 0 8px;font-family:var(--f-display);font-size:17px;font-weight:600}
.klist{list-style:none;margin:0;padding:0;max-height:46vh;overflow:auto;font-size:13.5px}
.klist li{display:grid;grid-template-columns:44px 1fr;gap:6px;padding:4px 0;border-bottom:1px dotted var(--line)}
.klist .kc{font-family:var(--f-mono);font-size:11.5px;color:var(--magenta);padding-top:2px}
.klist li.sub{padding-left:10px}
.rail .btn{width:100%;justify-content:center}
.pager{display:flex;justify-content:space-between;gap:12px;margin-top:40px;padding-top:18px;border-top:1px solid var(--line);flex-wrap:wrap}

/* quiz & exam */
.qwrap{max-width:760px}
.qhead{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;padding-bottom:12px;border-bottom:1px solid var(--line)}
.progress{height:4px;background:var(--chip);border-radius:2px;margin:12px 0 20px;overflow:hidden}
.progress span{display:block;height:100%;background:var(--blue)}
.qtext{font-size:21px;font-weight:600;line-height:1.4;margin:6px 0 18px}
.opts{display:flex;flex-direction:column;gap:10px}
.opt{display:grid;grid-template-columns:30px 1fr;gap:10px;align-items:start;text-align:left;padding:12px 14px;border:1px solid var(--line);border-radius:8px;background:var(--surface);font-size:17px}
.opt .ol{font-family:var(--f-mono);font-weight:500;color:var(--muted)}
.opt:hover:not(:disabled){border-color:var(--blue)}
.opt.sel{border-color:var(--blue);box-shadow:inset 0 0 0 1px var(--blue)}
.opt.right{border-color:var(--good);box-shadow:inset 0 0 0 1px var(--good)}
.opt.right .ol{color:var(--good)}
.opt.wrong{border-color:var(--bad);box-shadow:inset 0 0 0 1px var(--bad)}
.opt.wrong .ol{color:var(--bad)}
.opt:disabled{cursor:default}
.feedback{margin-top:16px;padding:14px 16px;border-radius:8px;background:var(--surface);border:1px solid var(--line)}
.feedback .verdict{font-family:var(--f-display);font-size:20px;font-weight:700}
.feedback .verdict.good{color:var(--good)} .feedback .verdict.bad{color:var(--bad)}
.feedback .ref{font-size:13.5px;color:var(--muted);margin-top:6px}
.qfoot{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:22px;flex-wrap:wrap}
.timer{font-family:var(--f-mono);font-size:18px;font-variant-numeric:tabular-nums;padding:4px 10px;border-radius:6px;background:var(--chip)}
.timer.low{color:var(--bad)}
.flag{background:none;border:1px solid var(--line);border-radius:6px;padding:5px 10px;font-size:14px;font-weight:600}
.flag[aria-pressed="true"]{border-color:var(--warn);color:var(--warn)}
.navgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(38px,1fr));gap:6px;margin-top:26px}
.navgrid button{height:36px;border:1px solid var(--line);border-radius:6px;background:var(--surface);font-family:var(--f-mono);font-size:12.5px;font-variant-numeric:tabular-nums;position:relative}
.navgrid button.ans{background:color-mix(in srgb,var(--blue) 16%,var(--surface));border-color:color-mix(in srgb,var(--blue) 40%,var(--line))}
.navgrid button.cur{box-shadow:inset 0 0 0 2px var(--ink)}
.navgrid button.flg::after{content:"";position:absolute;top:3px;right:3px;width:7px;height:7px;border-radius:50%;background:var(--warn)}
.legend{display:flex;gap:16px;font-size:13px;color:var(--muted);margin-top:8px;flex-wrap:wrap}
.confirm{margin-top:16px;padding:14px 16px;border:1px solid var(--warn);border-radius:8px;background:var(--surface)}

.exam-intro{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:32px;margin-top:20px}
.choice{display:flex;flex-direction:column;gap:10px}
.choice label{display:grid;grid-template-columns:22px 1fr;gap:10px;padding:14px;border:1px solid var(--line);border-radius:8px;background:var(--surface);cursor:pointer}
.choice input{margin-top:5px;accent-color:var(--blue)}
.choice .ct{font-weight:700}
.choice .cd{font-size:14px;color:var(--muted)}
.blueprint td:last-child,.blueprint th:last-child{text-align:right;font-variant-numeric:tabular-nums}

/* results */
.aktr{background:var(--surface);border:1px solid var(--line);border-radius:10px;overflow:hidden;margin-top:18px}
.aktr-top{display:grid;grid-template-columns:auto 1fr auto;gap:20px;align-items:center;padding:18px 20px;border-bottom:1px solid var(--line)}
.score{font-family:var(--f-display);font-size:64px;font-weight:700;line-height:1;font-variant-numeric:tabular-nums}
.stamp{font-family:var(--f-display);font-size:22px;font-weight:700;letter-spacing:.08em;padding:6px 14px;border:3px solid currentColor;border-radius:6px;transform:rotate(-4deg)}
.stamp.pass{color:var(--good)} .stamp.fail{color:var(--bad)}
.abars{padding:16px 20px;display:flex;flex-direction:column;gap:10px;border-bottom:1px solid var(--line)}
.abar{display:grid;grid-template-columns:160px 1fr 64px;gap:12px;align-items:center;font-size:14.5px}
.abar .track{height:10px;background:var(--chip);border-radius:5px;overflow:hidden}
.abar .track span{display:block;height:100%;border-radius:5px}
.abar .v{text-align:right;font-variant-numeric:tabular-nums;font-family:var(--f-mono);font-size:13px}
.codes{padding:16px 20px}
.codes h3{margin:0 0 4px}
.codelist{display:flex;flex-direction:column;margin-top:8px}
.codelist button{display:grid;grid-template-columns:120px 1fr;gap:12px;text-align:left;background:none;border:0;border-bottom:1px dotted var(--line);padding:8px 0;font-size:15px}
.codelist button:hover .kt{text-decoration:underline}
.codelist .kc{font-family:var(--f-mono);font-size:12.5px;color:var(--magenta);padding-top:2px}
.review{margin-top:28px}
.ritem{padding:14px 0;border-bottom:1px solid var(--line)}
.ritem .rq{font-weight:600}
.ritem .ra{font-size:15px;margin-top:6px}
.ritem .ra .x{color:var(--bad)} .ritem .ra .ok{color:var(--good)}
.history{margin-top:10px;font-size:14px}
.history td{padding:6px 10px}

/* reference */
.refgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin-top:16px}
.refcard{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:14px}
.refcard .n{font-family:var(--f-display);font-size:30px;font-weight:700;color:var(--blue);line-height:1.1;display:block}
.refcard .l{font-size:14.5px}
.refcard .c{margin-top:6px}
.links{columns:2 280px;margin-top:10px;padding-left:20px}
.links li{margin:6px 0;break-inside:avoid}
.note{font-size:14px;color:var(--muted);max-width:70ch;margin-top:28px;border-top:1px solid var(--line);padding-top:14px}
.empty{padding:20px;border:1px dashed var(--line);border-radius:8px;color:var(--muted)}

@media (max-width:820px){
  .hero{grid-template-columns:1fr}
  .lesson{grid-template-columns:1fr}
  .rail{position:static;order:-1}
  .klist{max-height:220px}
  .exam-intro{grid-template-columns:1fr}
}
@media (max-width:560px){
  body{font-size:16px}
  .task{grid-template-columns:70px 1fr auto;gap:10px}
  .task .tk{display:none}
  .area-head{grid-template-columns:auto 1fr}
  .weight{grid-column:2;text-align:left}
  .wbar{grid-column:1/3}
  .abar{grid-template-columns:1fr 54px}
  .abar .track{grid-column:1/3;grid-row:2}
  .aktr-top{grid-template-columns:auto 1fr}
  .stamp{grid-column:1/3;justify-self:start}
  .codelist button{grid-template-columns:1fr}
  .qtext{font-size:19px}
  .stats .n{font-size:26px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* ---------- multi-user additions ---------- */
.brand img{height:30px;width:auto;display:block}
.acct{position:relative}
.acct>button{background:var(--chip);border:0;border-radius:6px;padding:6px 12px;font-weight:600}
.menu{position:absolute;right:0;top:calc(100% + 6px);background:var(--surface);border:1px solid var(--line);border-radius:8px;min-width:200px;padding:6px;display:flex;flex-direction:column;z-index:6;box-shadow:0 8px 24px rgba(0,0,0,.12)}
.menu button{background:none;border:0;text-align:left;padding:8px 10px;border-radius:6px}
.menu button:hover{background:var(--chip)}
.menu .who{padding:8px 10px;font-size:13px;color:var(--muted);border-bottom:1px solid var(--line);margin-bottom:4px}
.role{font-family:var(--f-mono);font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--magenta)}

.auth{max-width:440px;margin:6vh auto 0}
.auth h1{font-size:40px}
.auth .sub{color:var(--muted);margin:8px 0 22px}
.form{display:flex;flex-direction:column;gap:14px}
.field{display:flex;flex-direction:column;gap:5px}
.field label{font-weight:600;font-size:15px}
.field .hint{font-size:13px;color:var(--muted)}
.field input,.field select,.field textarea{font:inherit;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);width:100%}
.field input:focus,.field select:focus{border-color:var(--blue);outline:none;box-shadow:0 0 0 3px color-mix(in srgb,var(--blue) 20%,transparent)}
.inline{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;align-items:end}
.msg{padding:10px 14px;border-radius:8px;font-size:15px}
.msg.error{background:color-mix(in srgb,var(--bad) 12%,transparent);color:var(--bad)}
.msg.ok{background:color-mix(in srgb,var(--good) 13%,transparent);color:var(--good)}
.links-row{display:flex;gap:16px;flex-wrap:wrap;margin-top:18px;font-size:15px}
.links-row button{background:none;border:0;padding:0;color:var(--blue);font-weight:600}

.req{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:16px;margin-top:4px}
.req h3{margin:0 0 10px}
.req ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}
.req li{display:grid;grid-template-columns:24px 1fr auto;gap:10px;align-items:center;font-size:15px}
.req .tick{width:20px;height:20px;border-radius:50%;border:2px solid var(--line);display:grid;place-items:center;font-size:12px;font-weight:700}
.req .tick.on{background:var(--good);border-color:var(--good);color:var(--surface)}
.req .meter{height:6px;background:var(--chip);border-radius:3px;overflow:hidden;grid-column:2/4}
.req .meter span{display:block;height:100%;background:var(--blue)}
.req .btn{margin-top:14px;width:100%;justify-content:center}

.dtable{width:100%;border-collapse:collapse;font-size:15px}
.dtable th{position:sticky;top:0}
.dtable td{vertical-align:middle}
.dtable tr.click{cursor:pointer}
.dtable tr.click:hover td{background:var(--chip)}
.num{font-variant-numeric:tabular-nums;font-family:var(--f-mono);font-size:13.5px}
.codebox{font-family:var(--f-mono);font-size:15px;letter-spacing:.06em}
.newcodes{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.newcodes span{font-family:var(--f-mono);font-size:16px;background:var(--surface);border:1px solid var(--blue);border-radius:6px;padding:6px 10px}
.toolbar{display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap;margin:18px 0 10px}
.toolbar input{font:inherit;padding:8px 12px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);min-width:0;width:260px;max-width:100%}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:16px;margin-top:16px}
.panel h3{margin-top:0}
.grid2{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px}
.smallbtn{font-size:14px;padding:6px 12px}
.loading{padding:40px 0;color:var(--muted)}
@media (max-width:820px){.grid2{grid-template-columns:1fr}}
@media (max-width:560px){
  .bar .wrap{gap:8px}
  .acct{margin-left:auto}
  .nav{order:3;width:100%;margin-left:0;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none}
  .nav button{white-space:nowrap}
  .brand{font-size:18px}
}

/* ---------- figures ---------- */
.linkbtn{background:none;border:0;padding:0;color:var(--blue);font-weight:600;font-size:inherit}
.linkbtn:hover{text-decoration:underline}
.qfig{margin:0 0 18px;border:1px solid var(--line);border-radius:8px;background:var(--surface);overflow:hidden}
.qfig-btn{display:block;width:100%;border:0;padding:0;background:#fff;cursor:zoom-in}
.qfig-btn img{display:block;width:100%;max-height:480px;object-fit:contain}
.qfig figcaption{font-size:13px;color:var(--muted);padding:6px 10px;border-top:1px solid var(--line)}
.ritem .linkbtn{font-size:13px;margin-left:8px}
.figgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;margin:10px 0 8px}
.figcard{display:flex;flex-direction:column;text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:0;overflow:hidden;cursor:zoom-in}
.figcard:hover{border-color:var(--blue)}
.figcard img{width:100%;height:120px;object-fit:cover;object-position:top;background:#fff;display:block}
.figcard span{padding:8px 10px;font-size:13px;color:var(--muted)}
.figcard b{color:var(--ink)}
.lightbox{position:fixed;inset:0;z-index:50;background:#0b0f15;display:flex;flex-direction:column;padding-top:env(safe-area-inset-top,0px)}
.lb-bar{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;padding:10px max(16px,env(safe-area-inset-right,0px)) 10px max(16px,env(safe-area-inset-left,0px));color:#fff;background:#141b24}
.lb-bar .btn{background:#fff;color:#18212C;border-color:#fff}
.lb-scroll{flex:1;overflow:auto;-webkit-overflow-scrolling:touch;display:block;text-align:center;padding:10px}
.lb-scroll img{max-width:none;background:#fff}
.lb-scroll img.fit{max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain}
.lb-stage{position:relative;display:inline-block;line-height:0;max-width:none}
.lb-stage.fit{max-width:100%}
.lb-stage.fit img{max-height:calc(100dvh - 150px)}
.lb-ruler input,.lb-ruler select{font:inherit;padding:4px 6px;border:1px solid #c9b88a;border-radius:6px;background:#fff;color:#18212C}
.lb-stage.measuring{touch-action:none;cursor:crosshair}
.lb-svg{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.lb-line{stroke:#E0262B;stroke-width:3;vector-effect:non-scaling-stroke;stroke-linecap:round}
.lb-line-bg{stroke:#fff;stroke-width:7;vector-effect:non-scaling-stroke;stroke-linecap:round}
.lb-dot{fill:#E0262B;stroke:#fff;stroke-width:2;vector-effect:non-scaling-stroke}
.lb-ruler{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;padding:8px max(16px,env(safe-area-inset-right,0px)) 8px max(16px,env(safe-area-inset-left,0px));background:#FFF4D6;color:#18212C;font-size:15px;line-height:1.35}
.lb-ruler #lb-read{flex:1 1 220px;min-height:calc(3 * 1.35em)}
.lb-ruler b{font-weight:700}.lb-note{color:#6b5a2a;font-size:13px}
.lb-bar .btn.on{background:#E0262B;color:#fff;border-color:#E0262B}

/* ---------- terms ---------- */
.check{display:grid!important;grid-template-columns:20px 1fr;gap:10px;align-items:start;font-weight:400!important;font-size:14.5px}
.check input{width:18px!important;height:18px;margin-top:3px;accent-color:var(--blue)}
.terms-scroll{max-height:52vh;overflow:auto;background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:6px 18px 16px;font-size:15px}
.terms-scroll h2{font-size:17px;margin:18px 0 4px}
.sitefoot{border-top:1px solid var(--line);margin-top:24px}
.sitefoot .wrap{padding-block:16px 28px;font-size:12.5px;color:var(--muted);line-height:1.5}

/* ---------- ClearedFor107 brand ---------- */
.brand img{height:34px;width:34px;border-radius:50%}
.wordmark{font-family:"Montserrat","Arial Black",Arial,sans-serif;font-weight:800;text-transform:none;letter-spacing:-.01em;font-size:23px}
.wordmark .w1{color:var(--ink)} .wordmark .w2{color:var(--blue)}
.logo-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px;display:flex;justify-content:center;margin-bottom:18px}
.logo-card img{width:100%;max-width:300px;height:auto}
.btn.primary{background:var(--ink);border-color:var(--ink)}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .btn.primary{background:var(--blue);border-color:var(--blue);color:#06121F}}
:root[data-theme="dark"] .btn.primary{background:var(--blue);border-color:var(--blue);color:#06121F}
@media (max-width:560px){.wordmark{font-size:20px}.brand img{height:30px;width:30px}}

/* ---------- beta + feedback ---------- */
.beta-chip{font-family:var(--f-mono);font-size:11px;font-weight:500;letter-spacing:.08em;color:#fff;background:var(--blue);border-radius:4px;padding:2px 6px;margin-left:8px;align-self:center}
.beta-chip.sm{font-size:10px;padding:1px 5px;margin-left:4px;vertical-align:2px}
.fb-link{display:block;margin-top:12px;font-size:13.5px}
.modal-wrap{position:fixed;inset:0;z-index:60;background:rgba(5,12,20,.55);display:flex;align-items:center;justify-content:center;padding:16px}
.modal{background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:12px;padding:20px;width:100%;max-width:520px;max-height:90vh;overflow:auto;box-shadow:0 20px 50px rgba(0,0,0,.25)}
.modal textarea{font:inherit;width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink);resize:vertical}
.subtabs{display:flex;gap:4px;margin:18px 0 4px;border-bottom:1px solid var(--line)}
.subtabs button{background:none;border:0;border-bottom:3px solid transparent;padding:8px 12px;font-weight:600;color:var(--muted)}
.subtabs button[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--blue)}
.linkbox{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:12px;background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:8px 10px}
.linkbox .codebox{flex:1;min-width:0;font-size:13.5px}
.minihead{font-family:var(--f-display);font-size:17px;margin:16px 0 6px}
.trow{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;padding:8px 0;border-bottom:1px dotted var(--line)}
.fbitem{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:14px;margin-top:10px}
.brand,.acct>button{flex-shrink:0;white-space:nowrap}
@media (max-width:980px){
  .bar .wrap{gap:8px}
  .acct{margin-left:auto}
  .nav{order:3;width:100%;margin-left:0;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none}
  .nav button{white-space:nowrap}
}
@media (min-width:981px){
  .bar .wrap{flex-wrap:nowrap}
  .nav{flex-wrap:nowrap;gap:2px;min-width:0;overflow-x:auto;scrollbar-width:none}
  .nav button{padding:6px 10px;white-space:nowrap;font-size:15.5px}
}

/* ---------- mobile ---------- */
.nav-more-wrap{position:relative;display:none}
.nav-more{background:none;border:0;padding:6px 12px;border-radius:6px;font-weight:600;color:var(--muted);white-space:nowrap}
.nav-more[aria-current="page"]{color:var(--ink);background:var(--chip)}
.nav-more-wrap .menu{left:auto;right:0}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
button,a,input,select,label{-webkit-tap-highlight-color:color-mix(in srgb,var(--blue) 18%,transparent)}
.linkbtn,.links-row button,.area-quiz,.fb-link{min-height:44px;display:inline-flex;align-items:center}
.fb-link{display:flex}
.qfig figcaption .linkbtn,.ritem .linkbtn{min-height:36px}
.check input{width:22px!important;height:22px;margin-top:1px}
.check{grid-template-columns:24px 1fr!important;padding:4px 0}
@media (max-width:1240px){
  .nav-staff{display:none}
  .nav-more-wrap{display:inline-block}
  .nav{overflow:visible}
}
@media (max-width:600px){
  .btn{min-height:44px}
  .smallbtn{min-height:40px}
  .navgrid{grid-template-columns:repeat(auto-fill,minmax(44px,1fr))}
  .navgrid button{height:44px}
  .flag{min-height:40px}
  .opt{padding:14px;min-height:52px}
  .qfoot .btn{flex:1;justify-content:center}
  .exam-intro .choice label{padding:16px}
  /* tables become stacked cards */
  table.stack, table.stack tbody, table.stack tr, table.stack td{display:block;width:100%}
  table.stack thead{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
  table.stack tr{border-bottom:1px solid var(--line);padding:10px 12px}
  table.stack td{border:0;padding:3px 0;display:flex;justify-content:space-between;gap:12px;align-items:center;text-align:right}
  table.stack td::before{content:attr(data-label);color:var(--muted);font-size:13px;text-align:left;flex-shrink:0}
  table.stack td:first-child{display:block;text-align:left;padding-bottom:6px}
  table.stack td:first-child::before{display:none}
  table.stack td:empty{display:none}
  table.stack td[data-label=""]::before,table.stack td:not([data-label])::before{display:none}
  table.stack td:last-child:not([data-label]){justify-content:flex-start;padding-top:8px}
  .table-wrap:has(table.stack){overflow-x:visible}
  .toolbar input{width:100%}
  .linkbox{flex-direction:column;align-items:stretch}
  .linkbox .btn{justify-content:center}
  .trow .row{width:100%}
  .trow .row .btn{flex:1;justify-content:center}
  .modal-wrap{align-items:flex-end;padding:0}
  .modal{border-radius:14px 14px 0 0;max-height:92vh;padding-bottom:max(20px,env(safe-area-inset-bottom,0px))}
  .lb-bar{gap:8px}
  .lb-bar .row{width:100%}
  .lb-bar .btn{flex:1;justify-content:center}
}
.nav .sh{display:none}
.table-wrap{position:relative}
@media (max-width:600px){
  .nav{gap:2px;justify-content:space-between}
  .nav button,.nav-more{padding:8px 10px;font-size:15.5px;min-height:40px}
  .nav .lg{display:none}
  .nav .sh{display:inline}
  table.stack thead{position:absolute;left:0;top:0;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%)}
  table.stack thead th{padding:0;border:0}
}
@media (max-width:600px){ .refcard button.code{padding:8px 10px;font-size:12.5px} }

/* ---------- access ---------- */
.chip.locked{color:var(--muted);background:var(--chip);border:1px dashed var(--line)}
.chip.review{color:var(--blue);background:color-mix(in srgb,var(--blue) 14%,transparent)}
.access-line{font-size:13.5px;color:var(--muted);margin:12px 0 0}
.access-line.off{color:var(--bad);font-weight:600}
.access-panel{margin-top:28px;background:var(--surface);border:1px solid var(--line);border-left:5px solid var(--warn);border-radius:12px;padding:18px}
.access-panel h2{font-size:24px}
.access-panel>div>p{margin:8px 0 0;max-width:66ch}
.access-forms{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px;margin-top:16px}
.access-form{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:14px;display:flex;flex-direction:column;gap:10px;align-items:flex-start}
.access-form h3{margin:0;font-size:19px}
.access-form p{margin:0;font-size:14.5px}
.access-form .field{width:100%}
.review-card{margin-top:24px;display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.review-card h3{margin:2px 0 4px;font-size:20px}
.review-card p{margin:0;font-size:14.5px}
.review-card.quiet{background:transparent;border-style:dashed}
.lock-note{background:var(--surface);border:1px solid var(--line);border-left:5px solid var(--warn);border-radius:10px;padding:14px 16px;margin-top:18px;max-width:72ch}
.lock-note p{margin:0 0 8px}
.rv-task{padding:10px 0;border-bottom:1px dotted var(--line)}
.codechips{display:flex;flex-wrap:wrap;gap:6px;margin-top:4px}
@media (max-width:600px){ .review-card .row{width:100%} .review-card .btn{flex:1;justify-content:center} .access-form .btn{width:100%;justify-content:center} }
.rx-row{display:flex;gap:10px;align-items:flex-end;flex-wrap:wrap;margin-top:10px}
.rx-row .field{width:170px}
@media (max-width:600px){ .rx-row .field{width:100%} .rx-row .btn{width:100%;justify-content:center} }
.rx-open{margin-top:10px;background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:10px 12px}

/* ---------- show / hide password ---------- */
.pw-wrap{position:relative;width:100%}
.pw-wrap input{padding-right:72px!important}
.pw-toggle{position:absolute;right:4px;top:50%;transform:translateY(-50%);min-height:36px;padding:0 12px;border:0;border-radius:6px;background:transparent;color:var(--blue);font-weight:600;font-size:14px}
.pw-toggle:hover{background:var(--chip)}
.export-box{width:100%;font-family:var(--f-mono);font-size:13px;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);margin:6px 0 10px}

/* ---------- question reference ---------- */
.qref{margin:8px 0 0;font-size:14px;color:var(--muted);display:flex;flex-wrap:wrap;gap:4px 8px;align-items:baseline}
.qref-label{font-family:var(--f-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.qref a,.feedback .ref a,.ritem a{color:var(--blue)}
.linkbtn.ref-fig{min-height:0;display:inline;font-weight:500;text-decoration:underline}

/* Keep the full staff menu on one row only where it fits */
@media (min-width:981px) and (max-width:1240px){ .nav{flex-wrap:nowrap;overflow:visible} .nav-more-wrap{display:inline-block} }
/* Staff pages always live under the Manage menu so the top bar never overflows */
.nav .nav-staff{display:none}
.nav .nav-more-wrap{display:inline-block}
.nav{overflow:visible!important}
.leave-opts{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-top:12px}
.leave-opts p{margin:6px 0 0;font-size:13.5px}
@media (max-width:600px){ .leave-opts .btn{width:100%;justify-content:center} }

/* ---------- question numbers & bank ---------- */
.qnum{font-family:var(--f-mono);font-size:11.5px;font-weight:500;color:var(--ink);background:var(--chip);border:1px solid var(--line);padding:1px 6px;border-radius:4px;white-space:nowrap;vertical-align:2px}
.bkitem{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:14px;margin-top:10px}
.bk-opts{list-style:none;margin:0;padding:0;font-size:15px;display:flex;flex-direction:column;gap:3px}
.bk-opts li{color:var(--muted)} .bk-opts li.ok{color:var(--good);font-weight:600}

/* ---------- FAA test guide ---------- */
.guide{max-width:76ch;display:flex;flex-direction:column;gap:14px;margin-top:18px}
.guide section{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.guide section.alt{border-left:5px solid var(--warn)}
.guide h2{font-size:22px;display:flex;align-items:center;gap:10px}
.guide ol,.guide ul{margin:10px 0 0;padding-left:22px}
.guide li{margin:6px 0}
.gstep{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--ink);color:var(--surface);font-family:var(--f-mono);font-size:14px;flex-shrink:0}
.guide section.alt .gstep{background:var(--warn)}
.guide-card{display:flex;flex-direction:column;gap:4px;text-align:left;width:100%;background:var(--surface);border:1px solid var(--line);border-left:5px solid var(--blue);border-radius:12px;padding:16px 18px;cursor:pointer}
.guide-card:hover{border-color:var(--blue)}
.guide-card b{font-size:19px;color:var(--ink)}

/* ---------- lesson figures ---------- */
.lesson-figs{margin-top:28px;padding-top:6px;border-top:1px solid var(--line)}
.lfig-list{display:flex;flex-direction:column;gap:10px}
.lfig{display:grid;grid-template-columns:120px 1fr;gap:14px;align-items:start;text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:10px;cursor:zoom-in;font-size:14.5px;color:var(--muted)}
.lfig:hover{border-color:var(--blue)}
.lfig img{width:120px;height:120px;object-fit:cover;object-position:top;border-radius:6px;background:#fff;border:1px solid var(--line)}
.lfig b{color:var(--ink);font-size:15.5px}
@media (max-width:600px){ .lfig{grid-template-columns:88px 1fr;gap:10px} .lfig img{width:88px;height:88px} }

/* ---------- inline lesson figures ---------- */
.ifig{margin:14px 0 20px;background:var(--surface);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.ifig-btn{display:block;width:100%;padding:8px;background:#fff;border:0;border-bottom:1px solid var(--line);cursor:zoom-in}
.ifig-btn img{display:block;max-width:100%;max-height:420px;margin:0 auto;object-fit:contain}
.ifig figcaption{padding:10px 12px;font-size:14.5px;color:var(--muted);line-height:1.5}
.ifig figcaption b{color:var(--ink)}
.ifig-src{display:inline-block;font-size:12px;letter-spacing:.02em;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:0 8px;margin-left:4px;white-space:nowrap}
.src-tag{display:inline-block;font-size:11.5px;font-weight:600;border-radius:999px;padding:0 7px;margin-left:4px;border:1px solid var(--line);color:var(--muted)}
.src-tag.sg{border-color:var(--blue);color:var(--blue)}
@media (max-width:600px){ .ifig-btn img{max-height:300px} .ifig-src{white-space:normal} }

/* ---------- guide acknowledgment ---------- */
.ack-panel{margin-top:26px;padding:18px 20px;background:var(--surface);border:1px solid var(--line);border-left:5px solid var(--blue);border-radius:12px}
.ack-panel h2{margin:0 0 10px;font-size:20px}
.ack-check{display:flex;gap:10px;align-items:flex-start;margin:0 0 14px;font-size:15px;line-height:1.5;cursor:pointer}
.ack-check input{width:20px;height:20px;margin-top:2px;flex-shrink:0}

/* ---------- reset my progress ---------- */
.reset-panel{scroll-margin-top:90px;margin-top:30px;padding:18px 20px;background:var(--surface);border:1px solid var(--line);border-left:5px solid var(--bad);border-radius:12px}
.reset-panel h2{margin:0 0 8px;font-size:20px}
.reset-panel p{margin:0 0 10px}

/* ---------- beta test mode, code links ---------- */
.testmode{display:flex;gap:14px;align-items:center;justify-content:space-between;flex-wrap:wrap;margin:0 0 18px;padding:12px 16px;border:1px dashed var(--warn);border-radius:10px;background:color-mix(in srgb,var(--warn) 9%,var(--surface));font-size:14.5px;line-height:1.5}
.testmode > div{flex:1 1 320px}
.chip.warn{background:color-mix(in srgb,var(--warn) 16%,var(--surface));color:var(--warn)}
.linkcell{display:flex;flex-direction:column;gap:6px;align-items:flex-start;min-width:0}
.linktxt{font-family:var(--f-mono);font-size:12.5px;word-break:break-all;color:var(--muted)}
.newlinks{display:flex;flex-direction:column;gap:8px;margin-top:10px}
.newlink{display:flex;gap:10px;align-items:center;flex-wrap:wrap;padding:8px 10px;background:var(--surface);border:1px solid var(--line);border-radius:8px}
.newlink .linktxt{flex:1 1 220px}
.practice-bar{max-width:1008px;margin:16px auto 0;width:calc(100% - 32px);box-sizing:border-box}

/* ---------- student questions ---------- */
.ask{margin-top:28px;padding-top:6px;border-top:1px solid var(--line)}
.ask textarea,.reply textarea{font:inherit;width:100%;box-sizing:border-box;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink)}
.thread{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin:0 0 12px}
.bubble{margin:10px 0 0;padding:9px 12px;border-radius:10px;max-width:92%}
.bubble .who{font-size:12.5px;color:var(--muted);margin-bottom:3px}
.bubble .body{white-space:pre-wrap;overflow-wrap:anywhere}
.bubble.from-student{background:color-mix(in srgb,var(--blue) 8%,var(--surface));border:1px solid color-mix(in srgb,var(--blue) 22%,transparent)}
.bubble.from-staff{margin-left:auto;background:color-mix(in srgb,var(--good) 9%,var(--surface));border:1px solid color-mix(in srgb,var(--good) 25%,transparent)}
.reply{margin-top:10px}
.badge{display:inline-grid;place-items:center;min-width:18px;height:18px;padding:0 5px;border-radius:9px;background:var(--bad);color:#fff;font-size:11.5px;font-weight:700;line-height:1}
.segs{display:inline-flex;border:1px solid var(--line);border-radius:999px;overflow:hidden;background:var(--surface)}
.seg{border:0;background:transparent;padding:7px 12px;font:inherit;font-size:14px;color:var(--ink);cursor:pointer;min-height:36px}
.seg + .seg{border-left:1px solid var(--line)}
.seg.on{background:var(--ink);color:var(--surface);font-weight:600}
.certbtns{flex-wrap:wrap}
a.btn{text-decoration:none}

/* ---------- start page and free sample test ---------- */
.landing{padding:8px 0 10px}
.land-hero{display:grid;grid-template-columns:minmax(0,300px) minmax(0,1fr);gap:28px;align-items:center;margin-top:12px}
.land-hero .logo-card{margin:0}
.land-hero h1{font-size:clamp(30px,5vw,44px);line-height:1.08;margin:6px 0 10px}
.lead{font-size:18px;line-height:1.55;color:var(--ink)}
.btn.big{padding:12px 20px;font-size:17px;min-height:48px}
.land-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin-top:30px}
.land-card{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.land-card h3{margin:0 0 6px;font-size:18px}
.land-card p{margin:0;color:var(--muted);font-size:15px;line-height:1.5}
.checks{padding-left:20px;line-height:1.6}
.qgrid{display:flex;flex-wrap:wrap;gap:6px;margin:16px 0 4px}
.qgrid button{width:38px;height:38px;border-radius:8px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font:inherit;font-size:14px;cursor:pointer}
.qgrid button.ans{background:color-mix(in srgb,var(--blue) 14%,var(--surface));border-color:color-mix(in srgb,var(--blue) 40%,transparent)}
.qgrid button.cur{outline:2px solid var(--ink);outline-offset:1px}
@media (max-width:700px){ .land-hero{grid-template-columns:1fr;gap:12px} .land-hero .logo-card{max-width:260px} }

/* ---------- start page v2: sectional-chart hero, real screens, honest comparisons ---------- */
.lh{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:40px;align-items:center;padding:28px 0 10px}
.lh-logo{width:280px;height:auto;display:block;margin:0 0 18px}
.lh-title{font-family:'Saira Condensed',var(--f-sans,system-ui),sans-serif;font-weight:700;font-size:clamp(38px,5.6vw,62px);line-height:.98;letter-spacing:-.01em;color:var(--ink);margin:0 0 16px;text-wrap:balance}
.lh .lead{max-width:52ch}
.lh-ctas{gap:10px;margin-top:22px}
.lh-sub{margin:12px 0 0;color:var(--muted);font-size:15px}
.lh-sub .linkbtn{font-size:15px}
.lh-art{position:relative}
.chart-art{width:100%;height:auto;display:block;border-radius:18px;box-shadow:0 1px 0 var(--line),0 18px 40px -22px rgba(11,36,64,.45)}
.chart-art .clbl text{font:700 22px 'Saira Condensed',sans-serif;fill:#9A2B76}
.chart-art .clbl line{stroke:#9A2B76;stroke-width:2.5}
.chart-art .dlbl{font:700 16px 'Saira Condensed',sans-serif;fill:#1373BE;text-anchor:middle}
.chart-art .mlbl{font:600 14px 'Saira Condensed',sans-serif;fill:#5E6A7A;letter-spacing:.04em}
.chart-art .olbl{font:700 17px 'Saira Condensed',sans-serif;fill:#1E3A5F}
.chart-art .olbl.sm{font-weight:500;font-size:15px}
.chart-art .callout rect{fill:#0B2440}
.chart-art .callout text{font:500 15px 'Source Sans 3',sans-serif;fill:#DCE8F5}
.chart-art .callout text.em{font-weight:700;font-size:17px;fill:#fff}

.land-h2{font-family:'Saira Condensed',sans-serif;font-weight:700;font-size:clamp(28px,3.6vw,38px);line-height:1.05;margin:56px 0 6px;color:var(--ink)}
.land-note{font-size:14px;margin:0}
.tour{display:flex;flex-direction:column;gap:38px;margin-top:22px}
.tour-row{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:32px;align-items:center}
.tour-row.flip{grid-template-columns:minmax(0,1fr) minmax(0,1.35fr)}
.tour-row.flip .shot{order:2}
.tour-row h3{font-size:22px;line-height:1.2;margin:0 0 8px}
.tour-row p{margin:0;color:var(--muted);font-size:16.5px;line-height:1.6;max-width:46ch}
.shot{margin:0;border-radius:12px;overflow:hidden;border:1px solid var(--line);background:#fff;box-shadow:0 14px 34px -24px rgba(11,36,64,.5)}
.shot img{display:block;width:100%;height:auto}

.asks{margin:18px 0 0;border-top:1px solid var(--line)}
.ask-row{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.4fr);gap:24px;padding:16px 0;border-bottom:1px solid var(--line)}
.ask-row dt{font-weight:700;font-size:17px;color:var(--ink)}
.ask-row dd{margin:0;color:var(--muted);font-size:16px;line-height:1.55}

.land-cta{display:flex;gap:24px;align-items:center;justify-content:space-between;flex-wrap:wrap;margin-top:48px;padding:26px 28px;border-radius:16px;background:#0B2440;color:#DCE8F5}
.land-cta h2{font-family:'Saira Condensed',sans-serif;font-size:32px;margin:0 0 6px;color:#fff}
.land-cta p{margin:0;max-width:56ch;line-height:1.55}
.land-cta .btn.primary{background:#fff;color:#0B2440;border-color:#fff}

@media (max-width:820px){
  .lh{grid-template-columns:1fr;gap:22px;padding-top:14px}
  .lh-logo{width:230px}
  .tour-row,.tour-row.flip{grid-template-columns:1fr;gap:14px}
  .tour-row.flip .shot{order:0}
  .ask-row{grid-template-columns:1fr;gap:4px}
  .land-cta{padding:22px}
}

/* ---------- beta test page guides ---------- */
.guide-pop h3{margin:2px 0 8px;font-size:22px}
.guide-pop h4{margin:14px 0 6px;font-size:15px}
.guide-pop ul{margin:0;padding-left:20px;line-height:1.55}
.guide-pop li + li{margin-top:4px}
.gp-tag{display:inline-block;font-size:12.5px;font-weight:600;color:var(--warn);border:1px dashed var(--warn);border-radius:999px;padding:1px 10px}
.gp-purpose{margin:0;line-height:1.55}
.about-page{position:fixed;right:16px;bottom:16px;z-index:40;border:1px dashed var(--warn);background:var(--surface);color:var(--ink);border-radius:999px;padding:9px 14px;font:inherit;font-size:14px;font-weight:600;cursor:pointer;box-shadow:0 6px 18px -8px rgba(0,0,0,.35)}
.about-page:hover{border-style:solid}
@media print{.about-page{display:none}}

/* beta tester suggestion box (bottom of every page in test mode) */
.sugg{margin:32px 0 8px;border:1.5px dashed var(--warn);border-radius:14px;background:color-mix(in srgb,var(--warn) 5%,var(--surface));padding:0 16px}
.sugg>summary{cursor:pointer;padding:14px 0;font-weight:600;display:flex;gap:10px;align-items:center;flex-wrap:wrap;list-style:none}
.sugg>summary::-webkit-details-marker{display:none}
.sugg>summary::after{content:"▾";margin-left:auto;color:var(--muted);transition:transform .15s}
.sugg:not([open])>summary::after{transform:rotate(-90deg)}
.sugg form{padding:0 0 16px}
.sugg-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);gap:12px}
.sg-pri{border:0;padding:0;margin:0;min-width:0}
.sg-pri legend{font-weight:600;font-size:14px;margin-bottom:6px;padding:0}
.sg-pri .check{margin:2px 0}
@media (max-width:600px){.sugg-grid{grid-template-columns:1fr}}
@media print{.sugg{display:none}}
@media (max-width:700px){.sugg{margin-bottom:64px}}
/* location numbers and ticket numbers on feedback */
.locno{display:inline-block;font:600 12.5px/1.4 var(--mono,ui-monospace,monospace);color:var(--ink,inherit);background:var(--chip);border:1px solid var(--line);border-radius:6px;padding:1px 8px;white-space:nowrap}
.sugg>summary .locno{font-weight:600}
.locline{margin:-4px 0 12px;font-size:14px;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.ticket{font-family:var(--mono,ui-monospace,monospace);font-size:13px}

/* ---------- lessons in order ---------- */
.task.seq-locked{opacity:.62}
.task.seq-locked .tk{font-style:italic}

/* ---------- lesson add-ons ---------- */
.job{border:1px solid var(--line);border-left:4px solid var(--blue);background:color-mix(in srgb,var(--blue) 6%,var(--surface));border-radius:12px;padding:14px 18px;margin:0 0 22px}
.job p{margin:6px 0}
.job-tag{font:600 12px/1 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--blue)}
.job-ask{font-weight:650}
.job-hint{font-size:14px}
.job-end{margin-top:26px}
.job-ans summary{cursor:pointer;font-weight:600;color:var(--blue);padding:4px 0}
.job-ans p{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:10px 12px}
.bluf{margin:4px 0 12px;padding:8px 12px;border-radius:8px;background:var(--sky);border:1px solid var(--line);font-weight:550}
.bluf span{display:block;font:600 11px/1.4 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:2px}
.hook{margin:10px 0 14px;padding:10px 14px;border-radius:10px;border:1.5px dashed var(--magenta);background:color-mix(in srgb,var(--magenta) 6%,var(--surface))}
.hook p{margin:4px 0 0}
.hook-tag{font:600 11px/1 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--magenta)}
.ckcard{margin:22px 0;padding:14px 16px;border-radius:12px;border:1px solid var(--line);background:var(--surface);box-shadow:0 1px 0 var(--line)}
.ck-tag{font:600 12px/1 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--good);display:flex;gap:8px;align-items:center}
.ck-tag .muted{letter-spacing:0;text-transform:none;font-weight:500}
.ck-q{font-weight:600;margin:10px 0}
.ck-opts{display:grid;gap:8px}
.ck-o{display:flex;gap:10px;align-items:flex-start;text-align:left;width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--paper,var(--surface));color:inherit;font:inherit;cursor:pointer}
.ck-o:hover:not(:disabled){border-color:var(--blue)}
.ck-o:disabled{cursor:default}
.ck-l{font:600 13px/1.5 var(--f-mono);color:var(--muted);min-width:1.2em}
.ck-o.right{border-color:var(--good);background:color-mix(in srgb,var(--good) 10%,transparent)}
.ck-o.wrong{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 10%,transparent)}
.ck-out p{margin:8px 0 0}
.ck-v{font-weight:700}.ck-v.good{color:var(--good)}.ck-v.bad{color:var(--bad)}
.traps,.takeaways{margin-top:26px;padding:14px 18px;border-radius:12px;border:1px solid var(--line)}
.traps{border-left:4px solid var(--warn);background:color-mix(in srgb,var(--warn) 6%,var(--surface))}
.traps h3,.takeaways h3{margin-top:0}
.traps li,.takeaways li{margin:6px 0}
.takeaways{border-left:4px solid var(--good);background:color-mix(in srgb,var(--good) 6%,var(--surface))}
.takeaways ol{font-weight:600}

/* ---------- diagrams ---------- */
.dg{margin:12px 0 18px;padding:12px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.dg svg{display:block;width:100%;max-width:520px;height:auto;margin:0 auto}
.dg figcaption{font-size:14px;color:var(--muted);margin-top:8px;text-align:center}
.dg text{fill:var(--ink);font-family:var(--f-body)}
.dg .dg-b{font-size:12px;font-weight:600}.dg .dg-s{font-size:11px}
.dg .dg-rn{font:700 12px var(--f-mono);fill:var(--ink)}
.dg-ground{stroke:var(--muted);stroke-width:2}
.dg-limit{stroke:var(--bad);stroke-width:2;stroke-dasharray:6 4}
.dg-limit2{stroke:var(--warn);stroke-width:2;stroke-dasharray:6 4}
.dg-zone{fill:var(--warn);opacity:.1}
.dg-tower{stroke:var(--ink);stroke-width:2}
.dg-arrow,.dg-entry{stroke:var(--ink);stroke-width:1.5;fill:none}
.dg-entry{stroke-dasharray:4 3}
.dg-head{fill:var(--ink)}
.dg-drone circle{fill:var(--blue)}.dg-drone line{stroke:var(--blue);stroke-width:2.5}
.dg-cloud ellipse{fill:var(--chip);stroke:var(--muted)}
.dg-pilot{fill:var(--good)}
.dg-rwy{fill:var(--muted);opacity:.55}
.dg-path{stroke:var(--blue);stroke-width:2.5;fill:none}
.dg-tl{max-width:560px;margin:0 auto;font-size:13px}
.tl-row{display:grid;grid-template-columns:2fr 1.3fr 3fr 1.3fr 2fr;gap:3px;text-align:center}
.tl-row>span{padding:8px 4px;border-radius:6px}
.tl-row .n{background:#1d2a3d;color:#e8eef6}.tl-row .tw{background:#7c5a95;color:#fff}.tl-row .d{background:#f3d77a;color:#3a2e00}
.tl-marks{display:grid;grid-template-columns:2fr 1.3fr 3fr 1.3fr 2fr;font-size:12px;color:var(--muted);text-align:center;margin:3px 0}
.tl-marks span:nth-child(2){text-align:right}.tl-marks span:nth-child(4){text-align:left}
.tl-req .y{background:color-mix(in srgb,var(--bad) 16%,transparent);color:var(--bad);font-weight:600}
.tl-req .no{background:var(--chip);color:var(--muted)}
.dg-flow{max-width:560px;margin:0 auto;font-size:14px;text-align:center}
.fl-q{font-weight:700;padding:8px;border-radius:8px;background:var(--chip);margin-bottom:8px}
.fl-cols{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.fl-in{padding:8px;border:1px solid var(--line);border-radius:8px;background:var(--sky)}
.fl-ar{color:var(--muted);line-height:1.4}
.fl-yes,.fl-no{padding:8px;border-radius:8px;font-weight:700}
.fl-yes{background:color-mix(in srgb,var(--bad) 14%,transparent);color:var(--bad)}
.fl-no{background:color-mix(in srgb,var(--good) 14%,transparent);color:var(--good)}
.dg-sym{width:100%;max-width:560px;margin:0 auto;border-collapse:collapse;font-size:14px}
.dg-sym td,.dg-sym th{padding:6px 8px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}
.dg-metar{display:flex;flex-wrap:wrap;gap:6px;justify-content:center}
.mt{display:flex;flex-direction:column;align-items:center;padding:6px 8px;border-radius:8px;border:1px solid var(--line);border-top-width:4px;background:var(--sky);min-width:64px}
.mt code{font:700 14px var(--f-mono)}.mt small{font-size:11.5px;color:var(--muted);text-align:center;max-width:120px}
.mt0{border-top-color:var(--blue)}.mt1{border-top-color:var(--magenta)}.mt2{border-top-color:var(--good)}.mt3{border-top-color:var(--warn)}
@media (max-width:520px){.fl-cols{grid-template-columns:1fr}.tl-row,.tl-marks{font-size:11px}}

/* ---------- flashcards ---------- */
.cards-top{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;margin:14px 0 6px;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.decks{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:10px}
.deck{display:grid;grid-template-columns:auto 1fr;gap:2px 10px;text-align:left;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:inherit;font:inherit;cursor:pointer}
button.deck:hover{border-color:var(--blue)}
.deck .tc{font:600 12px/1.6 var(--f-mono);color:var(--muted)}.deck .tt{font-weight:650}
.deck .tk{grid-column:1/-1;font-size:13px;color:var(--muted)}
.deck .chip{grid-column:1/-1;justify-self:start}
.deck.locked{opacity:.6;cursor:default}
.dbar{grid-column:1/-1;height:6px;border-radius:99px;background:var(--chip);overflow:hidden;margin-top:6px}
.dbar span{display:block;height:100%;background:var(--good)}
.fc-wrap{max-width:620px;margin:10px auto 0;text-align:center}
.fc-meta{display:flex;justify-content:space-between;align-items:center;gap:8px;font-size:14px;color:var(--muted);margin-bottom:6px}
.fc-prog{height:5px;border-radius:99px;background:var(--chip);overflow:hidden;margin-bottom:14px}
.fc-prog span{display:block;height:100%;background:var(--blue)}
.fc{display:block;width:100%;min-height:250px;padding:0;border:0;background:none;cursor:pointer;perspective:1200px;font:inherit;color:inherit}
.fc-in{position:relative;display:block;width:100%;min-height:250px;transition:transform .45s;transform-style:preserve-3d}
.fc.flipped .fc-in{transform:rotateY(180deg)}
.fc-face{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;padding:22px;border-radius:16px;border:1px solid var(--line);background:var(--surface);box-shadow:0 6px 20px rgba(0,0,0,.08);backface-visibility:hidden;-webkit-backface-visibility:hidden}
.fc-back{transform:rotateY(180deg);border-color:var(--blue);background:color-mix(in srgb,var(--blue) 6%,var(--surface))}
.fc-face small{font:600 11px/1 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.fc-txt{font-size:clamp(18px,4.6vw,24px);font-weight:650;line-height:1.35}
.fc-back .fc-txt{font-size:clamp(16px,4vw,20px);font-weight:550}
.fc-tap{margin-top:6px}
.fc-acts{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:14px}
.fc-acts[hidden]{display:none}
.fc-acts kbd{font:600 11px var(--f-mono);border:1px solid currentColor;border-radius:4px;padding:0 4px;margin-left:6px;opacity:.7}
.fc-no{border-color:var(--warn);color:var(--warn)}
.fc-keys{font-size:13px;margin:10px 0 0}
.fc-done{padding-top:24px}
@media (prefers-reduced-motion:reduce){.fc-in{transition:none}}
@media (max-width:600px){.fc-keys{display:none}.fc-acts kbd{display:none}}

/* start page: disabled veteran-owned badge */
.vet-badge{display:inline-flex;align-items:center;gap:7px;margin:0 0 14px;padding:5px 12px 5px 10px;border:1.5px solid var(--ink);border-radius:999px;font:600 13px/1.2 var(--f-mono);letter-spacing:.06em;text-transform:uppercase;color:var(--ink);background:var(--surface)}
.vet-badge svg{fill:var(--bad);flex:none}

/* ---------- color theme ---------- */
.logo-d{display:none!important}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .logo-l{display:none!important}:root:not([data-theme="light"]) .logo-d{display:block!important}}
:root[data-theme="dark"] .logo-l{display:none!important}
:root[data-theme="dark"] .logo-d{display:block!important}
.logo-card .logo-d,.logo-card .logo-l{margin-inline:auto}
.acct{display:flex;align-items:center;gap:6px}
.acct>.theme-btn{display:inline-flex;align-items:center;justify-content:center;width:36px;height:34px;padding:0;color:var(--ink)}
.theme-btn svg{fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round}
.theme-btn svg path[d^="M20.5"]{fill:currentColor;stroke:none}
.theme-pick{display:inline-flex;align-items:center;gap:2px;margin-top:10px;padding:2px;border:1px solid var(--line);border-radius:999px;background:var(--surface)}
.theme-pick span{padding:0 8px 0 10px;font-size:12px;color:var(--muted)}
.theme-pick button{border:0;background:none;color:var(--muted);font:600 12.5px/1 var(--f-body);padding:6px 11px;border-radius:999px;cursor:pointer}
.theme-pick button[aria-checked="true"]{background:var(--ink);color:var(--surface)}
.sitefoot .wrap{display:block}
.theme-pick{display:flex;width:max-content}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .logo-card{background:var(--surface)}}
:root[data-theme="dark"] .logo-card{background:var(--surface)}
.tl-row .n{box-shadow:inset 0 0 0 1px var(--line)}
/* FAA test result card */
.faa-card .row{flex-wrap:wrap;gap:8px}
.faa-card .row .btn{flex:1 1 auto;white-space:nowrap}
.faa-card.passed{border-left:4px solid var(--good)}
.faa-card.failed{border-left:4px solid var(--warn)}

/* start page: what's included */
.lstats{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;margin:34px 0 8px}
.lstat{padding:14px 16px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.lstat b{display:block;font-family:'Saira Condensed',var(--f-sans,system-ui),sans-serif;font-size:34px;line-height:1;color:var(--blue)}
.lstat span{display:block;margin-top:6px;font-size:14px;color:var(--muted);line-height:1.35}
@media (max-width:900px){.lstats{grid-template-columns:repeat(2,minmax(0,1fr))}.lstats .lstat:last-child{grid-column:1/-1}}

/* ---------- step-through lessons ---------- */
.mode-switch{margin:10px 0 0;font-size:14.5px}
.stepper .step{animation:stepin .18s ease-out}
@keyframes stepin{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){.stepper .step{animation:none}}
.stepper .step>.job:first-child,.stepper .step>.traps:first-child,.stepper .step>.job-end:first-child{margin-top:0}
.stepper .step>h3:first-child{margin-top:0}
.step-nav{position:sticky;bottom:0;z-index:4;display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:12px;align-items:center;margin:22px -4px 0;padding:12px 4px calc(12px + env(safe-area-inset-bottom,0px));background:color-mix(in srgb,var(--paper,var(--sky)) 92%,transparent);backdrop-filter:blur(6px);border-top:1px solid var(--line)}
.st-mid{display:flex;flex-direction:column;gap:6px;min-width:0;text-align:center}
#st-count{font-size:13.5px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.st-bar{display:block;height:6px;border-radius:99px;background:var(--chip);overflow:hidden}
.st-bar span{display:block;height:100%;background:var(--blue);transition:width .2s}
.st-hint{font-size:12.5px;color:var(--warn);min-height:0}
.st-hint:empty{display:none}
@media (max-width:600px){.step-nav{grid-template-columns:auto minmax(0,1fr) auto;gap:8px}.step-nav .btn{padding-inline:12px}#st-count{font-size:12px}}

/* ---------- interactive tools ---------- */
.tool{margin:14px 0 18px;padding:14px 16px;border-radius:12px;border:1.5px solid var(--blue);background:color-mix(in srgb,var(--blue) 5%,var(--surface))}
.tool-tag{font:600 11px/1 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--blue)}
.tool h4{margin:6px 0 2px;font-size:17px}
.tool-lead{margin:0 0 8px;font-size:14px}
.tool-svg{display:block;width:100%;max-width:520px;height:auto;margin:4px auto 6px;background:var(--surface);border:1px solid var(--line);border-radius:10px}
.tool-svg text{fill:var(--ink)}
.alt-zone{fill:var(--good);opacity:.12}
.alt-drone circle{fill:var(--good)}.alt-drone line{stroke:var(--good);stroke-width:2.5}
.alt-drone.bad circle{fill:var(--bad)}.alt-drone.bad line{stroke:var(--bad)}
.tool-ctrls{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px 16px;margin:8px 0}
.tool-ctrls label{display:flex;flex-direction:column;gap:4px;font-size:14px;font-weight:600}
.tool-ctrls label.wide{grid-column:1/-1}
.tool-ctrls b{font-family:var(--f-mono);font-weight:600;color:var(--blue)}
.tool-ctrls input[type=range]{width:100%;accent-color:var(--blue);height:28px}
.tool-ctrls select,.tool-ctrls input[type=time]{font:inherit;font-weight:400;padding:6px 8px;border:1px solid var(--line);border-radius:8px;background:var(--paper,var(--surface));color:var(--ink)}
.tool-out{margin:8px 0 0;padding:10px 12px;border-radius:8px;font-weight:600;font-size:15px}
.tool-out.good{background:color-mix(in srgb,var(--good) 13%,transparent);color:var(--good)}
.tool-out.bad{background:color-mix(in srgb,var(--bad) 13%,transparent);color:var(--bad)}
.tool-out.warn{background:color-mix(in srgb,var(--warn) 14%,transparent);color:var(--warn)}
.tool-out b{font-weight:800}
.tw-bar{position:relative;height:26px;border-radius:8px;overflow:hidden;margin:8px 0 2px;background:#1d2a3d}
.tw-bar span{position:absolute;top:0;bottom:0}
.tw-bar .n{background:#1d2a3d}.tw-bar .tw{background:#7c5a95}.tw-bar .d{background:#f3d77a}
.tw-bar i{position:absolute;top:-2px;bottom:-2px;width:3px;margin-left:-1px;background:var(--bad);box-shadow:0 0 0 2px #fff}
body:has(.step-nav) .about-page{bottom:96px}
.step-nav .btn.primary:disabled{opacity:1;background:var(--chip);border-color:var(--line);color:var(--muted)}
@media (max-width:820px){.lesson:has(.stepper) .rail{order:1}}

/* ---------- more lesson tools and quick games ---------- */
.tool-svg .dg-s{font-size:11px}.tool-svg .dg-b{font-size:12px;font-weight:600}.tool-svg .dg-rn{font:700 12px var(--f-mono)}
.tool-ctrls input[type=number],.tool-ctrls input[type=date]{font:inherit;font-weight:400;padding:6px 8px;border:1px solid var(--line);border-radius:8px;background:var(--paper,var(--surface));color:var(--ink);min-width:0}
.cl-ok{fill:var(--good);opacity:.13}
.lf-curve{fill:none;stroke:var(--blue);stroke-width:2.5}.lf-dot{fill:var(--bad)}
.da-rows{display:grid;gap:4px;margin:8px 0}
.da-rows div{display:flex;justify-content:space-between;gap:10px;padding:6px 10px;border-radius:8px;background:var(--surface);border:1px solid var(--line);font-size:15px}
.da-rows b{font-family:var(--f-mono)}.da-rows .da-main{border-color:var(--blue);font-weight:700}
.mt-pick{display:flex;flex-wrap:wrap;gap:6px;margin:6px 0 10px}
.chipbtn{font:600 13px/1 var(--f-body);padding:8px 12px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer}
.chipbtn.on{background:var(--blue);border-color:var(--blue);color:#fff}
.mt-groups{display:flex;flex-wrap:wrap;gap:6px;padding:10px;border-radius:10px;background:var(--surface);border:1px solid var(--line)}
.mt-tok{font:600 15px/1 var(--f-mono);padding:8px 9px;border-radius:7px;border:1px dashed var(--muted);background:transparent;color:var(--ink);cursor:pointer}
.mt-tok.seen{border-style:solid;border-color:var(--line);background:var(--chip)}
.mt-tok.on{border:1px solid var(--blue);background:var(--blue);color:#fff}
.mt-say{min-height:2.6em;margin:8px 0 10px;font-size:15px}
.mt-say code{font:700 14px var(--f-mono);color:var(--blue);margin-right:6px}
.pt-call{font:600 16px/1.45 var(--f-body);padding:10px 12px;border-radius:10px;background:var(--surface);border:1px solid var(--line);margin:6px 0 10px}
.pt-opts,.gm-bins{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:8px}
.pt-svg{max-width:260px}
.pt-arrow{stroke:var(--bad);stroke-width:4}.pt-head{fill:var(--bad)}
.gm-bin{font:600 15px/1.3 var(--f-body);text-align:left;padding:11px 12px;border-radius:10px;border:1.5px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer;min-height:44px}
.gm-bin:hover:not(:disabled){border-color:var(--blue)}
.gm-bin:disabled{cursor:default;opacity:.75}
.gm-bin.right{border-color:var(--good);background:color-mix(in srgb,var(--good) 12%,var(--surface));opacity:1}
.gm-bin.wrong{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 10%,var(--surface));opacity:1}
.gm-prog{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--muted);margin:4px 0 8px}
.gm-prog .st-bar{flex:1}
.gm-card{padding:14px;border-radius:10px;background:var(--surface);border:1px solid var(--line);margin-bottom:10px}
.gm-card p{margin:0;font-size:17px;font-weight:600}
.gm-sw{display:block;width:120px;height:30px;margin-bottom:8px}
.gm-out:empty{display:none}.gm-out{margin-top:10px}.gm-out .tool-out{font-weight:400}.gm-out .tool-out b{font-weight:700}
.gm-end{text-align:center}.gm-score{font:800 28px/1.2 var(--f-body);margin:6px 0}
.gm-missed{text-align:left;max-width:520px;margin:8px auto 12px;font-size:15px}
.mt-ask{margin:4px 0 8px;font-size:16px}
.mt-yn{display:grid;grid-template-columns:1fr 1fr;gap:8px;max-width:360px}
.mt-yn .gm-bin{text-align:center}
.lbody>h4,.step>h4{margin:18px 0 6px;font-size:17px}
.lbody .brk,.step .brk{overflow-wrap:anywhere}

/* ---------- course sales ---------- */
.msg.warn{background:color-mix(in srgb,var(--warn) 14%,transparent);color:var(--warn)}
.setup-list{list-style:none;padding:0;margin:6px 0 0;display:grid;gap:4px;font-size:15px}
.setup-list li.ok span{color:var(--good);font-weight:800}.setup-list li.todo span{color:var(--muted)}
.setup-list code,.panel code.sel{font-family:var(--f-mono);font-size:13px;overflow-wrap:anywhere}
a.btn{text-decoration:none;display:inline-flex;align-items:center;justify-content:center}
.aff-in{width:90px;font:inherit;padding:5px 8px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink)}

/* ---------- step-through guidance ---------- */
.st-do{margin:0 0 12px;padding:9px 12px;border-radius:10px;background:color-mix(in srgb,var(--blue) 9%,var(--surface));border:1px solid color-mix(in srgb,var(--blue) 30%,transparent);font-size:15px}
.howto{margin:0 0 16px;padding:14px 16px;border-radius:12px;border:1.5px solid var(--blue);background:color-mix(in srgb,var(--blue) 5%,var(--surface))}
.howto h3{margin:0 0 6px;font-size:18px}
.howto ol{margin:0;padding-left:22px;display:grid;gap:4px;font-size:15.5px}
.st-cont{margin:0 0 8px;font-size:14px;color:var(--muted)}
.st-cont b{color:var(--ink)}
@media (max-width:820px){.lesson.mid-step .rail{display:none}}
/* simpler step screens */
.lesson-head.compact .eyebrow,.lesson-head.compact .obj,.lesson-head.compact .refs,.lesson-head.compact .mode-switch{display:none}
.lesson-head.compact h1{font-size:22px;margin:0 0 4px}
article.st-on .code{display:none}
details.optbox{margin:12px 0;border:1px dashed var(--line);border-radius:10px;background:var(--surface)}
details.optbox>summary{cursor:pointer;padding:10px 12px;font-weight:600;font-size:15px;list-style:none}
details.optbox>summary::-webkit-details-marker{display:none}
details.optbox>summary::before{content:'▸ ';color:var(--blue)}
details.optbox[open]>summary::before{content:'▾ '}
details.optbox .opt-tag{font:600 11px/1 var(--f-mono);letter-spacing:.06em;text-transform:uppercase;color:var(--blue);margin-right:4px}
details.optbox>.tool{margin:0;border:0;border-top:1px solid var(--line);border-radius:0 0 10px 10px}
details.optbox>.tool>.tool-tag{display:none}

/* ---------- focused lesson layout (step-through) ---------- */
body.focus-lesson .crumbs,body.focus-lesson .lesson-head{display:none}
body.focus-lesson .lesson{display:block;max-width:720px;margin:0 auto}
body.focus-lesson .lesson.mid-step .rail{display:none}
body.focus-lesson .rail{position:static;margin-top:20px}
body.focus-lesson{padding-bottom:calc(84px + env(safe-area-inset-bottom,0px))}
.fl-top{max-width:720px;margin:4px auto 18px;padding:0 0 10px;border-bottom:1px solid var(--line)}
.fl-row{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.fl-title{font-family:var(--f-display);font-weight:700;font-size:19px;flex:1 1 auto;min-width:0}
.fl-count{font-size:13.5px;color:var(--muted);white-space:nowrap}
.fl-row2{display:flex;align-items:center;gap:10px;margin-top:8px}
.fl-row2 .st-bar{flex:1}
.fl-one{font-size:13px;white-space:nowrap}
.fl-sec{font-size:13px;color:var(--muted);margin-top:6px}
body.focus-lesson .step-nav{position:fixed;left:0;right:0;bottom:0;z-index:30;margin:0;padding:10px 16px calc(10px + env(safe-area-inset-bottom,0px));display:block;background:color-mix(in srgb,var(--paper,var(--sky)) 94%,transparent);backdrop-filter:blur(8px);border-top:1px solid var(--line);box-shadow:0 -6px 18px -12px rgba(0,0,0,.35)}
.step-nav .st-in{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:10px;align-items:center;max-width:720px;margin:0 auto}
.step-nav .st-mid{text-align:center}
.step-nav .btn{min-height:46px;padding-inline:20px;font-size:16px}
.step-nav .st-hint{color:var(--muted);font-size:13px}
.step-nav.wait .st-hint{color:var(--warn);font-weight:600}
body.focus-lesson .st-do{display:none}
body.focus-lesson .about-page{bottom:calc(92px + env(safe-area-inset-bottom,0px))}
/* On lesson screens, testers get a one-line test bar and no floating guide button. */
body.focus-lesson .practice-bar{display:flex;align-items:center;gap:10px;padding:6px 10px;margin-bottom:10px}
body.focus-lesson .practice-bar>div:first-child{display:none}
body.focus-lesson .practice-bar::before{content:'Test mode';font-weight:700;font-size:13px;color:var(--warn)}
body.focus-lesson .about-page{display:none}
body.focus-lesson #end-quiz{display:none}

/* ---------- Study page: lesson tiles ---------- */
.home-top{padding:8px 0 22px;border-bottom:1px solid var(--line);margin-bottom:8px}
.home-top h1{margin:0 0 4px;font-size:32px}
.home-sub{margin:0 0 8px;color:var(--muted);font-weight:600}
.home-bar{height:10px;border-radius:99px;background:var(--chip);overflow:hidden;max-width:520px;margin-bottom:16px}
.home-bar span{display:block;height:100%;background:var(--good);border-radius:99px}
.home-top .btn.big{max-width:100%;white-space:normal;text-align:left}
.tiles-area{margin:26px 0 6px}
.ta-head{display:flex;align-items:baseline;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.ta-head h2{font-size:21px;margin:0}
.ta-head h2 span{font:600 12px/1 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--blue);margin-right:6px;vertical-align:middle}
.ta-head .muted{font-size:13.5px}
.tiles{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
@media (max-width:560px){.tiles{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}}
.ltile{position:relative;display:flex;flex-direction:column;align-items:center;text-align:center;gap:6px;padding:18px 10px 14px;min-height:178px;border-radius:14px;border:1.5px solid var(--line);background:var(--surface);color:var(--ink);font:inherit;cursor:pointer;transition:transform .12s, border-color .12s, box-shadow .12s}
.ltile:hover{transform:translateY(-2px);border-color:var(--blue);box-shadow:0 8px 20px -14px rgba(0,0,0,.5)}
.ltile:focus-visible{outline:3px solid var(--blue);outline-offset:2px}
.lt-ic{width:58px;height:58px;fill:none;stroke:var(--ink);stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round;margin-bottom:4px}
.lt-ic .ic-a{stroke:var(--blue)}
.lt-t{font-weight:700;font-size:15.5px;line-height:1.25}
.lt-n{font:600 11px/1 var(--f-mono);letter-spacing:.07em;text-transform:uppercase;color:var(--muted);margin-top:auto}
.lt-st{font-size:12.5px;font-weight:600;color:var(--muted);padding:3px 9px;border-radius:99px;background:var(--chip)}
.lt-st.ok{color:var(--good);background:color-mix(in srgb,var(--good) 14%,transparent)}
.lt-st.go{color:#fff;background:var(--blue)}
.lt-st.try{color:var(--warn);background:color-mix(in srgb,var(--warn) 14%,transparent)}
.lt-st.lock{background:transparent}
.lt-badge{position:absolute;top:-8px;right:-8px;width:32px;height:32px;border-radius:50%;display:grid;place-items:center;font-weight:900;font-size:17px;box-shadow:0 2px 6px rgba(0,0,0,.2)}
.lt-badge.ok{background:var(--good);color:#fff}
.lt-badge.lk{background:var(--surface);border:1.5px solid var(--line)}
.lt-badge.lk svg{width:16px;height:16px;fill:none;stroke:var(--muted);stroke-width:2.2}
.ltile.done{border-color:color-mix(in srgb,var(--good) 55%,var(--line))}
.ltile.done .lt-ic .ic-a{stroke:var(--good)}
.ltile.next{border:2.5px solid var(--blue);box-shadow:0 0 0 4px color-mix(in srgb,var(--blue) 15%,transparent)}
.ltile.locked{opacity:.6}
.ltile.locked .lt-ic,.ltile.locked .lt-ic .ic-a{stroke:var(--muted)}
.ltile.final{background:color-mix(in srgb,var(--blue) 6%,var(--surface))}
.tiles-area .area-quiz{margin-top:10px}
.home-req{margin-top:30px}
details.more-lesson{margin:18px 0 6px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
details.more-lesson>summary{cursor:pointer;padding:12px 14px;font-weight:600;font-size:15px;color:var(--blue)}
details.more-lesson[open]>summary{border-bottom:1px solid var(--line)}
details.more-lesson>*:not(summary){margin:14px}
details.more-lesson .rail{position:static}

/* ---------- Lesson 00: how this course works ---------- */
.intro-body h2{font-size:24px;margin:4px 0 10px}
.intro-body p,.intro-body li{font-size:16.5px;line-height:1.55}
.in-facts{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:16px 0}
.in-facts div{text-align:center;padding:14px 6px;border-radius:12px;background:var(--surface);border:1px solid var(--line)}
.in-facts b{display:block;font-size:28px;color:var(--blue);font-family:var(--f-display)}
.in-facts span{font-size:13.5px;color:var(--muted)}
.in-areas{list-style:none;padding:0;margin:12px 0;display:grid;gap:6px}
.in-areas li{padding:10px 12px;border-radius:10px;background:var(--surface);border:1px solid var(--line);font-size:15.5px}
.in-areas li b{font:600 12px/1 var(--f-mono);letter-spacing:.06em;text-transform:uppercase;color:var(--blue);margin-right:6px}
.in-areas li span{display:block;font-size:13px;color:var(--muted);margin-top:2px}
.in-steps{padding-left:22px;display:grid;gap:6px}
.in-list{padding-left:20px;display:grid;gap:8px}
.in-mock{border:1.5px solid var(--line);border-radius:14px;background:var(--surface);overflow:hidden;margin:6px 0 14px;font-size:13px;max-width:420px}
.in-mtop{display:flex;gap:6px;align-items:baseline;padding:8px 10px 4px;color:var(--blue)}
.in-mtop b{color:var(--ink);flex:1}.in-mtop span{color:var(--muted);font-size:11.5px}
.in-mbar{height:5px;margin:0 10px 8px;border-radius:9px;background:var(--chip)}.in-mbar span{display:block;width:20%;height:100%;background:var(--blue);border-radius:9px}
.in-mbody{padding:4px 10px 8px}
.in-mh{display:block;font-size:15px;margin-bottom:6px}
.in-mbl{border:1px solid var(--line);border-radius:8px;padding:6px 8px;margin-bottom:6px;font-weight:600}
.in-mbl small,.in-mq small{display:block;font:600 9.5px/1.4 var(--f-mono);letter-spacing:.08em;color:var(--muted)}
.in-mbody p{margin:0 0 6px;color:var(--muted);font-size:13px!important}
.in-mq{border:1px solid var(--line);border-radius:8px;padding:6px 8px;font-weight:600}.in-mq small{color:var(--good)}
.in-mq span{display:block;height:14px;border-radius:5px;background:var(--chip);margin-top:5px}
.in-mnav{display:flex;justify-content:space-between;padding:8px 10px;border-top:1px solid var(--line)}
.in-mnav i{font-style:normal;padding:5px 12px;border-radius:8px;border:1px solid var(--line);font-weight:600}
.in-mnav i.p{background:var(--ink);color:var(--surface);border-color:var(--ink)}
.ex-lead{max-width:62ch;font-size:16.5px}
.ex-plan{margin:14px 0 18px;padding:14px 16px;border-radius:12px;border:1.5px solid var(--blue);background:color-mix(in srgb,var(--blue) 5%,var(--surface))}
.ex-plan h3{margin:0 0 6px;font-size:18px}
.ex-plan ol{margin:0;padding-left:22px;display:grid;gap:6px;font-size:15.5px}
.ex-counts{color:var(--good)}
/* Reference page */
.ref-jump{display:flex;flex-wrap:wrap;gap:8px;margin:6px 0 18px}
.ref-jump a{font:600 13.5px/1 var(--f-body);padding:8px 12px;border-radius:99px;border:1px solid var(--line);background:var(--surface);color:var(--blue);text-decoration:none}
.ref-h{font-size:22px;margin:26px 0 10px;scroll-margin-top:130px}
details.ref-fold{margin:18px 0;border:1px solid var(--line);border-radius:12px;background:var(--surface);scroll-margin-top:130px}
details.ref-fold>summary{cursor:pointer;padding:14px 16px;display:flex;flex-wrap:wrap;gap:4px 10px;align-items:baseline;font-weight:700;font-size:17px}
details.ref-fold>summary .muted{font-weight:400;font-size:14px}
details.ref-fold[open]>summary .muted{display:none}
details.ref-fold>*:not(summary){margin-left:16px;margin-right:16px}
details.ref-fold .figgrid{margin-bottom:16px}
@media (max-width:560px){.refgrid{grid-template-columns:1fr 1fr;gap:8px}.refcard .n{font-size:22px}.refcard .l{font-size:13.5px}}
.oc-tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin:14px 0}
.oc-tile{padding:14px;border-radius:12px;background:var(--surface);border:1px solid var(--line);text-align:center}
.oc-tile b{display:block;font:700 30px/1.1 var(--f-display);color:var(--blue)}
.oc-tile span{font-size:13.5px;color:var(--muted)}

/* ---------- exam result: weak spots, and deep dives ---------- */
.weak{margin:18px 0 6px;padding:14px 16px;border:1px solid var(--line);border-left:4px solid var(--bad);border-radius:0 10px 10px 0;background:var(--surface)}
.weak h3{margin:0 0 4px}
.weak-list{list-style:none;margin:0;padding:0}
.weak-list li{padding:12px 0;border-top:1px solid var(--line)}
.weak-list li:first-child{border-top:0}
.wk-top{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap}
.wk-score{margin-left:auto;font-size:14px;color:var(--muted);font-weight:600;white-space:nowrap}
.wk-score.bad{color:var(--bad)}
.wk-codes{margin-top:4px;font-size:14px;color:var(--muted)}
.deep-b{margin:16px 0;padding:14px 16px;border:1px solid var(--line);border-radius:10px;background:var(--surface);max-width:72ch}
.deep-b.hit{border-left:4px solid var(--bad)}
.deep-b h3{margin:8px 0 6px}
.deep-b ul,.deep-b ol{padding-left:22px}
.deep-b li{margin:4px 0}
.deep-src{font-size:14px;color:var(--muted);margin:10px 0 0}
.deep-more{max-width:72ch}
.deep-next{margin:22px 0 10px;padding:14px 16px;border:1px solid var(--line);border-radius:10px;background:var(--surface);max-width:72ch}
.deep-next h3{margin:0 0 4px}
@media (max-width:600px){.wk-score{margin-left:0;width:100%}}

/* ---------- lesson: about this lesson ---------- */
.about{margin:0 0 18px;padding:14px 16px;border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:0 10px 10px 0;background:var(--surface)}
.about-tag{font-family:var(--f-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--blue);font-weight:700}
.about h3.about-h{font-size:16px;margin:10px 0 2px}
.about p{margin:4px 0}
.about-topics{font-size:14.5px;margin-top:10px !important}
.about-weight{font-size:14px}

/* ---------- public: group pricing ---------- */
.groups{max-width:1040px;margin:0 auto;padding:8px 0 24px}
.groups h1{margin:4px 0 8px}
.groups .lead{max-width:68ch}
.gp-top{align-items:start}
.gp-card{margin:18px 0;padding:16px 18px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.gp-card h2{margin:0 0 10px;font-size:20px}
.gp-card .table-wrap{margin:0}
.gp-calc{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:12px}
.gp-calc input{width:6em;font:inherit;padding:6px 8px;border:1px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink)}
.gp-steps{margin:0;padding-left:22px}.gp-steps li{margin:6px 0}
.gp-list{margin:0;padding-left:22px;columns:2;column-gap:28px}.gp-list li{margin:4px 0;break-inside:avoid}
.gp-hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.gp-stform{display:flex;flex-wrap:wrap;gap:10px;align-items:flex-end}
.gp-stform .field{margin:0;flex:1 1 200px}
.gp-stform .field:first-child{flex:0 1 13em}
.lh-group{border-color:var(--blue);color:var(--blue)}
@media (max-width:700px){.gp-list{columns:1}}

.ld-stats{max-width:620px;margin-top:12px}
.ld-bar{display:inline-block;vertical-align:middle;width:70px;height:8px;border-radius:4px;background:var(--line);overflow:hidden;margin-right:4px}
.ld-bar span{display:block;height:100%;background:var(--good)}
.ok-t{color:var(--good);font-weight:700}

/* ---------- start page: teams band ---------- */
.lteam{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:28px;align-items:center;margin:40px 0 10px;padding:26px;border:1px solid var(--line);border-radius:16px;background:var(--surface)}
.lteam h2{margin:4px 0 10px;font-size:clamp(24px,3.2vw,32px);line-height:1.15}
.lteam-copy>p{max-width:60ch}
.lteam-feats{list-style:none;margin:16px 0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:14px 20px}
.lteam-feats li{display:flex;gap:10px;align-items:flex-start}
.lteam-feats b{display:block;margin-bottom:2px}
.lteam-feats span{font-size:14.5px;color:var(--muted)}
.lt-ic{flex:0 0 38px;height:38px;border-radius:10px;display:grid;place-items:center;background:color-mix(in srgb,var(--blue) 14%,transparent);color:var(--blue)}
.lteam-feats li span:not(.lt-ic){display:block}
.lteam-prices{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin:6px 0 16px}
.lteam-prices div{border:1px solid var(--line);border-radius:10px;padding:10px;text-align:center;background:var(--paper)}
.lteam-prices b{display:block;font-size:22px}
.lteam-prices span{display:block;font-size:13px;color:var(--muted)}
.lteam-prices em{display:block;font-style:normal;font-size:12.5px;font-weight:700;color:var(--good);margin-top:2px}
.lteam-ctas{gap:10px;flex-wrap:wrap}
.lt-mock{border:1px solid var(--line);border-radius:12px;background:var(--paper);padding:14px;box-shadow:0 10px 30px rgba(11,36,64,.10)}
.lt-mtop{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.lt-mtop span{font-family:var(--f-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);border:1px solid var(--line);border-radius:6px;padding:2px 6px}
.lt-mstats{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;margin-bottom:8px}
.lt-mstats div{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:8px}
.lt-mstats b{display:block;font-size:18px}.lt-mstats span{font-size:12px;color:var(--muted)}
.lt-mrow{display:grid;grid-template-columns:1fr auto;gap:4px 10px;align-items:center;padding:9px 0;border-top:1px solid var(--line)}
.lt-mname{font-weight:600;font-size:14.5px}
.lt-mrow .chip{grid-column:2;grid-row:1}
.lt-mbar{grid-column:1/-1;height:7px;border-radius:4px;background:var(--line);overflow:hidden}
.lt-mbar span{display:block;height:100%;background:var(--good)}
.lt-mmeta{grid-column:1/-1;font-size:12.5px;color:var(--muted)}
@media (max-width:860px){.lteam{grid-template-columns:1fr;padding:18px}.lteam-feats{grid-template-columns:1fr}.lteam-prices{grid-template-columns:repeat(2,minmax(0,1fr))}}

/* ---------- beyond the test: USNG ---------- */
.usng{max-width:72ch}
.mono{font-family:var(--f-mono)}
.ug-anat{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0 14px}
.ug-p{display:flex;flex-direction:column;align-items:center;padding:8px 14px;border-radius:10px;border:2px solid var(--line);background:var(--surface)}
.ug-p b{font-family:var(--f-mono);font-size:24px}.ug-p small{font-size:12.5px;color:var(--muted)}
.ug-p.z{border-color:var(--muted)}.ug-p.q{border-color:var(--warn)}.ug-p.e{border-color:var(--blue)}.ug-p.n{border-color:var(--magenta)}
.ug-row{display:grid;grid-template-columns:200px 1fr;gap:18px;align-items:center}
.ug-grid{width:200px;height:200px;color:var(--ink)}
.ug-practice{margin:22px 0;padding:14px 16px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.ug-q{padding:10px 0;border-top:1px solid var(--line)}.ug-q:first-of-type{border-top:0}
.ug-qt{margin:0 0 8px}
.ug-opts{display:flex;flex-wrap:wrap;gap:8px}
.ug-o{font-weight:500}
.ug-o.right{border-color:var(--good);color:var(--good);font-weight:700}
.ug-o.wrong{border-color:var(--bad);color:var(--bad)}
.ug-fb{margin:8px 0 0;font-size:14.5px}
@media (max-width:600px){.ug-row{grid-template-columns:1fr}.ug-grid{margin:0 auto}}

/* ---------- visitor questions ---------- */
.land-ask{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;margin:18px 0 0;padding:16px 18px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.land-ask h3{margin:0 0 4px}.land-ask p{margin:0}
.va-q,.va-a{padding:12px 14px;border:1px solid var(--line);border-radius:10px;background:var(--surface);margin:12px 0}
.va-a{border-left:4px solid var(--good)}
.vq{margin:6px 0 22px}

/* ---------- beyond the test: CAP grid, night course ---------- */
.cg-q{display:grid;grid-template-columns:repeat(2,minmax(0,140px));gap:6px;margin:8px 0 12px}
.cg-q span{border:2px solid var(--blue);border-radius:8px;padding:8px;text-align:center;font-family:var(--f-mono);font-size:22px;font-weight:700;color:var(--blue)}
.cg-q small{display:block;font-family:inherit;font-size:12.5px;font-weight:500;color:var(--muted)}
.cg-row{grid-template-columns:330px 1fr}
.cg-svg{width:330px;max-width:100%;color:var(--ink)}
.night-n{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--ink);color:var(--paper);font-size:15px;margin-right:6px;vertical-align:2px}
.night-cert{display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;margin:14px 0;padding:14px 16px;border:1px solid var(--line);border-left:4px solid var(--good);border-radius:0 10px 10px 0;background:var(--surface);max-width:72ch}
.night-cert h3{margin:2px 0}
.nq-q{border:0;margin:0;padding:10px 0;border-top:1px solid var(--line)}
.nq-q legend{padding:0}
.nq-o{display:flex;gap:8px;align-items:flex-start;padding:5px 0;cursor:pointer}
.nq-q.ok .ug-fb{color:var(--good)}.nq-q.bad .ug-fb{color:var(--bad)}
@media (max-width:700px){.cg-row{grid-template-columns:1fr}}

.lbonus{margin:36px 0 0}
.lbonus-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:10px}
.lbonus-card{display:flex;gap:14px;align-items:flex-start;padding:16px 18px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.lbonus-card svg{flex:0 0 40px;color:var(--blue)}
.lbonus-card h3{margin:0 0 4px}.lbonus-card p{margin:0;color:var(--muted)}
@media (max-width:760px){.lbonus-grid{grid-template-columns:1fr}}

/* ---------- reviews and survey ---------- */
.voice-card{margin-top:12px}
.stars{display:flex;gap:4px}
.stars label{cursor:pointer;font-size:34px;line-height:1;color:var(--line)}
.stars input{position:absolute;opacity:0;width:1px;height:1px}
.stars label:has(~ label input:checked),.stars label:has(input:checked){color:#E0A21B}
.stars:hover label{color:#E0A21B}.stars label:hover ~ label{color:var(--line)}
.stars input:focus-visible + span{outline:2px solid var(--blue);border-radius:4px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.stars-ro{color:#E0A21B;letter-spacing:1px}
.survey .sv-q{border:0;margin:0 0 16px;padding:0}
.survey legend{font-weight:600;margin-bottom:6px}
.survey .sv-req{color:var(--bad)}
.survey textarea,.survey select{font:inherit;width:100%;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink)}
.survey select{max-width:16em}
.sv-scale{display:flex;flex-wrap:wrap;gap:6px}
.sv-scale label{cursor:pointer}
.sv-scale input{position:absolute;opacity:0;width:1px;height:1px}
.sv-scale span{display:grid;place-items:center;min-width:40px;height:40px;border:1px solid var(--line);border-radius:8px;background:var(--surface);font-weight:600}
.sv-scale input:checked + span{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.sv-scale input:focus-visible + span{outline:2px solid var(--blue)}
.sv-ends{display:flex;justify-content:space-between;font-size:13px;color:var(--muted);margin-top:4px;max-width:480px}
.sv-multi{display:grid;grid-template-columns:1fr 1fr;gap:4px 16px}
ul.plain{list-style:none;margin:0;padding:0}ul.plain li{display:flex;justify-content:space-between;padding:4px 0;border-bottom:1px solid var(--line)}
.lreviews{margin:36px 0 0}
.lrev-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.lrev{margin:0;padding:16px 18px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.lrev blockquote{margin:8px 0;font-size:16px;line-height:1.5}
.lrev figcaption{font-weight:600;font-size:14.5px}
@media (max-width:600px){.sv-multi{grid-template-columns:1fr}}

/* ---------- instructor share kit ---------- */
.sk-top{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:16px;align-items:start}
.sk-url{word-break:break-all;font-size:15px}
.sk-qrbox{width:220px;max-width:100%;margin:0 auto;border-radius:10px;overflow:hidden;border:1px solid var(--line)}
.sk-qrbox svg{display:block;width:100%;height:auto}
.sk-qr h3{text-align:center}
.sk-prints{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.sk-print{text-align:left;padding:14px 16px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink);cursor:pointer;font:inherit}
.sk-print b{display:block;font-size:17px;margin-bottom:4px}.sk-print span{color:var(--muted);font-size:14px}
.sk-print:hover{border-color:var(--blue)}
.ref-ribbon{display:inline-block;margin:8px 0 0;padding:6px 12px;border-radius:999px;background:color-mix(in srgb,var(--blue) 12%,transparent);color:var(--ink);font-size:14.5px}
@media (max-width:800px){.sk-top,.sk-prints{grid-template-columns:1fr}}
.home-req-top{margin-top:18px}

/* ---------- Part 61 path ---------- */
.lh-61{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:12px 0 0;padding:8px 12px;border-radius:10px;background:color-mix(in srgb,var(--blue) 10%,transparent);font-size:15px}
.lh-61 svg{color:var(--blue);flex:0 0 auto}.lh-61 a{font-weight:600}
.p61-steps{list-style:none;margin:18px 0;padding:0;max-width:760px}
.p61-step{display:flex;gap:14px;align-items:flex-start;padding:14px 0;border-top:1px solid var(--line)}
.p61-step h3{margin:2px 0 6px}.p61-step p{margin:0 0 8px}.p61-step ul{margin:0 0 8px;padding-left:20px}
.p61-check{border-left:4px solid var(--good);max-width:760px}

/* ---------- public header for visitors ---------- */
.bar.pub .nav button{font-size:15.5px}
.bar.pub .acct{display:flex;align-items:center;gap:8px}
.bar.pub .pub-in{background:none;border:1px solid var(--line);border-radius:8px;padding:7px 14px;font-weight:600;color:var(--ink)}
.bar.pub .pub-in:hover{background:var(--chip)}
.bar.pub .pub-sample{padding:8px 14px;font-size:15px;white-space:nowrap}
@media (max-width:980px){.bar.pub .nav{justify-content:flex-start}}
@media (max-width:560px){.bar.pub .pub-sample{display:none}.bar.pub .nav button{font-size:14.5px;padding:6px 9px}}
/* landing: cropped course screens, readable at their shown size */
.tour-row{grid-template-columns:minmax(0,1.5fr) minmax(0,1fr)}
.tour-row.flip{grid-template-columns:minmax(0,1fr) minmax(0,1.5fr)}
.shot.narrow{max-width:560px;justify-self:center;width:100%}
.lstats+.lh-61{margin:14px 0 6px}
@media (max-width:900px){.tour-row,.tour-row.flip{grid-template-columns:1fr}}
#l-tour,#l-faq{scroll-margin-top:84px}
@media (max-width:980px){.bar.pub .nav{overflow-x:auto!important;max-width:100%}}

/* ---------- visitor header links, FAQ and guide pages ---------- */
.bar.pub .nav a{display:inline-block;padding:6px 10px;border-radius:6px;font-weight:600;color:var(--muted);text-decoration:none;white-space:nowrap;font-size:15.5px}
.bar.pub .nav a:hover{color:var(--ink)}
.bar.pub .nav a[aria-current="page"]{color:var(--ink);background:var(--chip)}
@media (max-width:560px){.bar.pub .nav a{font-size:14.5px;padding:6px 9px}}
.static-page{max-width:800px;margin:0 auto;padding:18px 0 28px}
.static-page h1{margin:4px 0 10px}
.static-page .lead{max-width:68ch}
.static-page.guide{display:flex;flex-direction:column;gap:14px}
.static-page.guide>h1,.static-page.guide>.lead,.static-page.guide>.eyebrow,.static-page.guide>.crumbs{margin-bottom:0}
.static-page .note{margin-top:6px}
.static-page .asks{margin-top:18px}
.sp-crumbs a{color:var(--blue);font-weight:600;text-decoration:none}
.sp-cta{margin-top:10px}
.sp-cta .btn{text-decoration:none}
.sp-guides{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:12px;margin-top:16px}
.sp-guide{display:flex;flex-direction:column;gap:6px;padding:16px 18px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink);text-decoration:none}
.sp-guide:hover{border-color:var(--blue)}
.sp-guide h2,.sp-guide h3{margin:0;font-size:19px}
.sp-guide p{margin:0;color:var(--muted);font-size:15px;line-height:1.5}
.sp-guide span{margin-top:auto;color:var(--blue);font-weight:600;font-size:15px}
.sp-more{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 18px}
.sp-more h2{font-size:19px;margin:0}
.sp-more ul{margin:8px 0 0;padding-left:20px}
.land-more{margin:12px 0 0}
.land-more a{font-weight:600}
.land-guides{margin-top:30px}
.bar.pub .acct{margin-left:12px}
@media (min-width:981px) and (max-width:1320px){.bar.pub .nav a[data-pub="ask"]{display:none}}
.comm-item{padding:6px 0;border-bottom:1px solid var(--line);font-size:14.5px}
.comm-item:last-child{border-bottom:0}
.comm-hist{margin:8px 0 0;padding-left:20px;font-size:14.5px}
tr.comm-det td{background:var(--sky)}
.cm-in{font:inherit;padding:5px 8px;border:1px solid var(--line);border-radius:6px;background:var(--paper);color:var(--ink)}
.inst-intro{margin:10px 0 4px;padding:14px 16px;border:1px solid color-mix(in srgb,var(--blue) 35%,var(--line));border-radius:12px;background:color-mix(in srgb,var(--blue) 7%,var(--surface))}
.inst-intro h2{font-size:19px;margin:0 0 6px}
.inst-intro ul{margin:0;padding-left:20px;font-size:15px;line-height:1.5}
.inst-intro li{margin:6px 0}
.sk-pay{margin-top:14px;padding-top:12px;border-top:1px solid var(--line)}
.sk-pay h4{margin:0 0 4px;font-size:16px}
.cn-pop{max-width:620px}
.cn-pop h3{margin:2px 0 8px;font-size:22px}
.cn-pop ul{padding-left:20px;margin:8px 0;font-size:15px;line-height:1.5}
.cn-pop li{margin:7px 0}
.sk-paid{margin-top:14px;padding-top:12px;border-top:1px solid var(--line)}
.sk-paid h4{margin:0 0 4px;font-size:16px}
.w9-due{color:var(--warn)}
.ye{margin-top:14px;padding-top:12px;border-top:1px solid var(--line)}
.ye h4{margin:0 0 4px;font-size:16px}
.ye-year{margin-top:8px}
.ptx h4{margin:12px 0 4px;font-size:16px}
.ptx ol,.ptx ul{margin:0;padding-left:20px;font-size:15px;line-height:1.5}
.ptx li{margin:5px 0}
.ptx p{margin:6px 0;font-size:15px;line-height:1.5}
.ptx-more{margin-top:10px;border:1px solid var(--line);border-radius:10px;padding:8px 12px;background:var(--surface)}
.ptx-more summary{font-weight:700;cursor:pointer}