/* Layout: a left lesson rail beside one lesson at a time; each lesson has Learn / Try it / Quiz tabs. Charcoal + signal orange from the RoadReady print kit. */
:root {
  --bg:#EDEFF1; --surface:#FFFFFF; --surface2:#F5F6F8; --ink:#14181F; --muted:#4D5663; --line:#D5DAE0;
  --accent:#F26B21; --accent-ink:#14181F; --accent-text:#B8470C; --dark:#14181F; --dark-ink:#F7F3EA;
  --good:#1D7A45; --good-bg:#E3F3E9; --bad:#B3261E; --bad-bg:#FBE7E5; --warn:#8A5A00; --warn-bg:#FCEFD3;
  --display:'Oswald','Arial Narrow',Arial,sans-serif; --body:'Public Sans',system-ui,-apple-system,'Segoe UI',Arial,sans-serif;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --bg:#0E1115; --surface:#181D25; --surface2:#1F252E; --ink:#F2F0EA; --muted:#AEB6C2; --line:#303844;
  --accent:#F26B21; --accent-ink:#14181F; --accent-text:#FF9A5C; --dark:#0A0C10; --dark-ink:#F7F3EA;
  --good:#6FD39A; --good-bg:#17301F; --bad:#FF8F86; --bad-bg:#3A1A18; --warn:#F2C46B; --warn-bg:#33270E; color-scheme: dark; } }
:root[data-theme="dark"] {
  --bg:#0E1115; --surface:#181D25; --surface2:#1F252E; --ink:#F2F0EA; --muted:#AEB6C2; --line:#303844;
  --accent:#F26B21; --accent-ink:#14181F; --accent-text:#FF9A5C; --dark:#0A0C10; --dark-ink:#F7F3EA;
  --good:#6FD39A; --good-bg:#17301F; --bad:#FF8F86; --bad-bg:#3A1A18; --warn:#F2C46B; --warn-bg:#33270E; color-scheme: dark; }
* { box-sizing:border-box; }
body { background:var(--bg); color:var(--ink); font-family:var(--body); font-size:16px; line-height:1.5; margin:0; }
h1,h2,h3 { font-family:var(--display); letter-spacing:.02em; line-height:1.15; margin:0; text-wrap:balance; }
h1 { font-size:clamp(30px,5vw,46px); text-transform:uppercase; }
h2 { font-size:clamp(22px,3.4vw,30px); text-transform:uppercase; }
h3 { font-size:19px; text-transform:uppercase; }
p { margin:0 0 10px; } p:last-child { margin-bottom:0; }
a { color:var(--accent-text); }
button { font:inherit; color:inherit; cursor:pointer; }
:focus-visible { outline:3px solid var(--accent); outline-offset:2px; }
.top { background:var(--dark); color:var(--dark-ink); position:sticky; top:env(safe-area-inset-top,0px); z-index:20; }
body::before { content:""; position:fixed; inset:0 0 auto; height:env(safe-area-inset-top,0px); background:var(--dark); z-index:30; }
.strip { height:8px; background:repeating-linear-gradient(90deg,var(--dark-ink) 0 14px,var(--dark) 14px 28px); }
.topin { display:flex; align-items:center; gap:16px; padding-block:10px; padding-left:max(16px,env(safe-area-inset-left,0px)); padding-right:max(16px,env(safe-area-inset-right,0px)); max-width:1200px; margin:0 auto; }
.brand { font-family:var(--display); font-size:22px; text-transform:uppercase; letter-spacing:.06em; color:var(--dark-ink); text-decoration:none; font-weight:700; white-space:nowrap; }
.brand b { color:var(--accent); }
.overall { flex:1; display:flex; align-items:center; gap:10px; min-width:0; }
.bar { flex:1; height:10px; background:rgba(255,255,255,.18); border-radius:99px; overflow:hidden; min-width:60px; }
.bar > i { display:block; height:100%; background:var(--accent); border-radius:99px; transition:width .35s; }
.overall span { font-size:13px; font-weight:600; white-space:nowrap; }
.toplinks { display:flex; gap:6px; }
.toplinks a { color:var(--dark-ink); text-decoration:none; font-size:14px; font-weight:600; padding:6px 10px; border-radius:8px; }
.toplinks a:hover, .toplinks a[aria-current="page"] { background:rgba(255,255,255,.14); }
.wrap { max-width:1200px; margin:0 auto; padding-block:22px 48px; padding-left:max(16px,env(safe-area-inset-left,0px)); padding-right:max(16px,env(safe-area-inset-right,0px)); display:grid; grid-template-columns:250px minmax(0,1fr); gap:24px; align-items:start; }
.rail { position:sticky; top:calc(env(safe-area-inset-top,0px) + 64px); display:flex; flex-direction:column; gap:6px; }
.rail a { display:flex; gap:10px; align-items:center; text-decoration:none; color:var(--ink); background:var(--surface); border:1px solid var(--line); border-radius:12px; padding:10px 12px; font-weight:600; font-size:14px; }
.rail a[aria-current="page"] { border-color:var(--accent); box-shadow:inset 4px 0 0 var(--accent); }
.rail .n { font-family:var(--display); font-size:18px; width:26px; height:26px; border-radius:50%; background:var(--surface2); display:grid; place-items:center; flex:none; }
.rail .done .n { background:var(--good); color:#fff; }
.rail small { display:block; color:var(--muted); font-weight:400; font-size:12px; }
main { min-width:0; display:flex; flex-direction:column; gap:18px; }
.card { background:var(--surface); border:1px solid var(--line); border-radius:14px; padding:20px; min-width:0; }
.card.dark { background:var(--dark); color:var(--dark-ink); border-color:var(--dark); }
.muted { color:var(--muted); } .small { font-size:13px; }
.eyebrow { font-size:12px; font-weight:700; letter-spacing:.14em; text-transform:uppercase; color:var(--accent-text); margin-bottom:6px; }
.dark .eyebrow { color:var(--accent); }
.grid2 { display:grid; grid-template-columns:repeat(auto-fit,minmax(260px,1fr)); gap:16px; }
.grid3 { display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr)); gap:14px; }
.btn { border:1.5px solid var(--ink); background:var(--surface); border-radius:10px; padding:10px 16px; font-weight:700; font-size:15px; }
.btn:hover { background:var(--surface2); }
.btn.primary { background:var(--accent); color:var(--accent-ink); border-color:var(--accent); }
.btn.primary:hover { filter:brightness(1.06); }
.btn:disabled { opacity:.45; cursor:not-allowed; }
.btn.sm { padding:6px 12px; font-size:13px; }
.row { display:flex; gap:10px; flex-wrap:wrap; align-items:center; }
.tabs { display:flex; gap:6px; flex-wrap:wrap; }
.tabs a { text-decoration:none; color:var(--ink); background:var(--surface); border:1px solid var(--line); border-radius:10px; padding:8px 14px; font-weight:700; font-size:14px; display:flex; gap:8px; align-items:center; }
.tabs a[aria-current="page"] { background:var(--ink); color:var(--bg); border-color:var(--ink); }
.pill { display:inline-flex; align-items:center; gap:5px; font-size:12px; font-weight:700; padding:3px 9px; border-radius:99px; background:var(--surface2); color:var(--muted); border:1px solid var(--line); }
.pill.ok { background:var(--good-bg); color:var(--good); border-color:transparent; }
.pill.warn { background:var(--warn-bg); color:var(--warn); border-color:transparent; }
.pill.bad { background:var(--bad-bg); color:var(--bad); border-color:transparent; }
.tbl { overflow-x:auto; } table { border-collapse:collapse; width:100%; font-size:15px; }
th,td { text-align:left; padding:8px 10px; border-bottom:1px solid var(--line); vertical-align:top; }
th { font-size:12px; letter-spacing:.08em; text-transform:uppercase; color:var(--muted); }
td.num, th.num { text-align:right; font-variant-numeric:tabular-nums; }
ul,ol { margin:6px 0 0; padding-left:22px; } li { margin:3px 0; }
.opt { display:flex; gap:12px; align-items:flex-start; width:100%; text-align:left; background:var(--surface); border:1.5px solid var(--line); border-radius:12px; padding:12px 14px; margin-bottom:8px; }
.opt:hover { border-color:var(--ink); }
.opt[aria-pressed="true"] { border-color:var(--accent); box-shadow:inset 4px 0 0 var(--accent); }
.opt.right { border-color:var(--good); background:var(--good-bg); } .opt.wrong { border-color:var(--bad); background:var(--bad-bg); }
.opt .k { font-family:var(--display); font-size:15px; background:var(--surface2); border-radius:6px; min-width:26px; height:26px; display:grid; place-items:center; flex:none; color:var(--ink); }
.fb { border-radius:12px; padding:12px 14px; margin:10px 0; border:1px solid transparent; }
.fb.good { background:var(--good-bg); color:var(--ink); border-color:var(--good); } .fb.bad { background:var(--bad-bg); color:var(--ink); border-color:var(--bad); }
.fb.info { background:var(--warn-bg); border-color:var(--warn); }
.fb strong { display:block; margin-bottom:2px; }
.big { font-family:var(--display); font-size:clamp(30px,6vw,44px); line-height:1; font-variant-numeric:tabular-nums; }
.stat { background:var(--surface2); border-radius:12px; padding:12px 14px; } .stat .small { display:block; }
.stat.hot { background:var(--accent); color:var(--accent-ink); }
.stat.hot .small { color:var(--accent-ink); }
.chips { display:flex; gap:8px; flex-wrap:wrap; }
.chip { border:1.5px solid var(--line); background:var(--surface); border-radius:99px; padding:7px 14px; font-weight:600; font-size:14px; }
.chip[aria-pressed="true"] { background:var(--ink); color:var(--bg); border-color:var(--ink); }
label { display:block; font-weight:600; font-size:14px; margin-bottom:4px; }
input[type=text],input[type=number],textarea,select { width:100%; font:inherit; color:var(--ink); background:var(--surface); border:1.5px solid var(--line); border-radius:10px; padding:9px 11px; }
input[type=range] { width:100%; accent-color:var(--accent); }
textarea { min-height:70px; resize:vertical; }
.field { margin-bottom:12px; }
.meter { height:8px; background:var(--surface2); border-radius:99px; overflow:hidden; } .meter i { display:block; height:100%; background:var(--accent); }
.lcard { display:flex; flex-direction:column; gap:10px; }
.lcard .num { font-family:var(--display); font-size:44px; line-height:1; color:var(--accent-text); }
.cert { border:6px solid var(--ink); border-radius:18px; padding:28px 18px; text-align:center; background:var(--surface); position:relative; overflow:hidden; }
.cert::before, .cert::after { content:""; position:absolute; left:0; right:0; height:14px; background:repeating-linear-gradient(90deg,var(--ink) 0 18px,var(--surface) 18px 36px); }
.cert::before { top:0; } .cert::after { bottom:0; }
.cert h2 { margin:14px 0 8px; font-size:clamp(26px,5vw,40px); }
.cert .nm { font-family:var(--display); font-size:clamp(28px,6vw,44px); border-bottom:2px solid var(--ink); display:inline-block; min-width:60%; padding:0 12px; margin:10px 0 6px; }
.toast { position:fixed; left:50%; transform:translateX(-50%); bottom:calc(20px + env(safe-area-inset-bottom,0px)); background:var(--ink); color:var(--bg); padding:10px 16px; border-radius:10px; font-weight:600; z-index:50; }
.kbd { font-family:var(--display); }
.sev { display:inline-block; width:10px; height:10px; border-radius:50%; margin-right:6px; }
.sev.r { background:var(--bad); } .sev.a { background:#D99A00; }
.tile { border:1.5px solid var(--line); background:var(--surface); border-radius:10px; padding:10px 12px; text-align:left; width:100%; margin-bottom:8px; }
.tile.used { opacity:.45; }
.seq li { margin:4px 0; }
.career { border:1.5px solid var(--line); border-radius:12px; padding:12px 14px; background:var(--surface); }
.career summary { cursor:pointer; font-weight:700; list-style:none; display:flex; justify-content:space-between; gap:8px; }
.career summary::-webkit-details-marker { display:none; }
.star { border:0; background:none; font-size:20px; line-height:1; color:var(--muted); padding:0 2px; }
.star[aria-pressed="true"] { color:var(--accent); }
@media (max-width:900px) {
  .wrap { grid-template-columns:minmax(0,1fr); }
  .rail { position:static; flex-direction:row; overflow-x:auto; padding-bottom:4px; }
  .rail a { flex:none; } .rail small { display:none; }
  .topin { flex-wrap:wrap; } .overall { order:3; flex-basis:100%; } .toplinks { margin-left:auto; }
}
@media (prefers-reduced-motion: reduce) { * { transition:none !important; } }

/* ---- site additions ---- */
.hidden { display:none !important; }
.authwrap { max-width:520px; margin:0 auto; padding-block:28px 60px; padding-left:max(16px,env(safe-area-inset-left,0px)); padding-right:max(16px,env(safe-area-inset-right,0px)); display:flex; flex-direction:column; gap:16px; }
.hero { background:var(--dark); color:var(--dark-ink); border-radius:14px; padding:22px; }
.hero h1 { margin-top:6px; }
.hero p { margin-top:10px; color:var(--dark-ink); }
.errmsg { color:var(--bad); font-weight:600; min-height:1.4em; margin:8px 0 0; }
.hint { color:var(--muted); font-size:13px; margin-top:4px; }
fieldset { border:1.5px solid var(--line); border-radius:12px; padding:10px 14px 12px; margin:0 0 14px; min-width:0; }
legend { font-weight:700; padding:0 6px; }
.radios { display:flex; flex-wrap:wrap; gap:8px; }
.radios label { display:inline-flex; align-items:center; gap:6px; border:1.5px solid var(--line); border-radius:99px; padding:6px 12px; font-weight:600; font-size:14px; margin:0; background:var(--surface); cursor:pointer; }
.radios input { accent-color:var(--accent); }
.userbox { display:flex; gap:8px; align-items:center; color:var(--dark-ink); font-size:14px; font-weight:600; }
.userbox button { background:transparent; color:var(--dark-ink); border:1px solid rgba(255,255,255,.35); border-radius:8px; padding:5px 10px; font-weight:600; font-size:13px; }
.banner { display:flex; gap:12px; align-items:center; justify-content:space-between; flex-wrap:wrap; background:var(--warn-bg); border:1px solid var(--warn); border-radius:12px; padding:12px 16px; }
/* teacher */
.tcols { display:grid; grid-template-columns:repeat(auto-fit,minmax(150px,1fr)); gap:12px; }
.code { font-family:var(--display); font-size:34px; letter-spacing:.18em; background:var(--surface2); border-radius:10px; padding:4px 14px; display:inline-block; }
.cell { min-width:64px; text-align:center; }
.dot { display:inline-block; width:22px; height:22px; border-radius:50%; line-height:22px; font-size:12px; font-weight:700; text-align:center; background:var(--surface2); color:var(--muted); }
.dot.ok { background:var(--good); color:#fff; } .dot.part { background:var(--warn-bg); color:var(--warn); border:1px solid var(--warn); }
.mini { height:8px; width:90px; background:var(--surface2); border-radius:99px; overflow:hidden; display:inline-block; vertical-align:middle; } .mini i { display:block; height:100%; background:var(--accent); }
.modal { position:fixed; inset:0; background:rgba(0,0,0,.55); display:grid; place-items:center; z-index:60; padding:16px; }
.modal > div { background:var(--surface); color:var(--ink); border-radius:14px; max-width:720px; width:100%; max-height:88vh; overflow:auto; padding:20px; }
.wrap.single { grid-template-columns:minmax(0,1fr); }
.bars td { vertical-align:middle; }

/* dashboard icons, video, charts */
.dashtile{display:inline-flex;vertical-align:middle;background:#14171b;border-radius:10px;padding:4px;line-height:0}
.dashicon{display:block}
.dashbig{display:inline-flex;background:#14171b;border-radius:16px;padding:10px;line-height:0}
.vid{margin:0 0 14px}
.vidbox{position:relative;aspect-ratio:16/9;background:#14171b;border-radius:12px;overflow:hidden}
.vidbox iframe,.vidbox video{position:absolute;inset:0;width:100%;height:100%;border:0;background:#000}
.vidplay{position:absolute;inset:0;width:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;background:linear-gradient(135deg,#1d2329,#0e1114);color:#fff;border:0;border-radius:12px;cursor:pointer;font:inherit;padding:16px;text-align:center}
.vidplay .tri{width:64px;height:64px;border-radius:50%;background:var(--accent,#ffb020);display:grid;place-items:center}
.vidplay .tri:after{content:"";border-left:20px solid #14171b;border-top:12px solid transparent;border-bottom:12px solid transparent;margin-left:5px}
.vidplay:focus-visible{outline:3px solid #fff;outline-offset:-6px}
.chart{width:100%;height:auto;display:block}
.chart text{font-family:var(--body,sans-serif);font-size:11px;fill:var(--muted,#667)}
.bar{display:flex;height:26px;border-radius:8px;overflow:hidden;background:var(--surface2)}
.bar span{display:block;height:100%}
.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:13px;margin-top:6px}
.legend i{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:5px;vertical-align:-1px}
tr.cur td{background:var(--surface2);font-weight:700}
.dec{display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:center;padding:12px 0;border-bottom:1px solid var(--line)}
@media (max-width:560px){.dec{grid-template-columns:1fr;justify-items:start}}