@import url('https://fonts.googleapis.com/css2?family=Lora:ital,wght@0,500;0,600;0,700;1,500&family=IBM+Plex+Mono:wght@400;500;600;700&display=swap');

:root{
  --ink:#1C2541; --ink-soft:#4a4433; --muted:#66604a; --paper:#F4EFE3; --paper-deep:#EAE2CF;
  --leaf:#2F7D4F; --leaf-soft:#E2EFE4; --rust:#B33A3A; --rust-soft:#F3DEDE; --teal:#3E7C74; --teal-soft:#E4EDE9;
  --gold:#B7862B; --gold-soft:#F6ECD4; --line:#C9BFA3; --white:#FFFDF8;
  --sec-a:#2F7D4F; --sec-b:#B33A3A; --sec-c:#4B5FA8; --sec-x:#B7862B; --sec-e:#2C7FA0; --sec-l:#3E7C74;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--paper);background-image:linear-gradient(rgba(201,191,163,.55) 1px,transparent 1px),linear-gradient(90deg,rgba(201,191,163,.55) 1px,transparent 1px);background-size:28px 28px;
  font-family:'Lora',serif;color:var(--ink);min-height:100vh;padding:28px 16px 60px;line-height:1.5}
a{color:var(--teal)}
.mono{font-family:'IBM Plex Mono',monospace}
.wrap{max-width:1080px;margin:0 auto}
button{font-family:'IBM Plex Mono',monospace;font-size:12.5px;font-weight:600;border:1.5px solid var(--ink);background:var(--white);color:var(--ink);
  padding:9px 14px;border-radius:3px;cursor:pointer;transition:background .12s,color .12s}
button:hover{background:var(--ink);color:var(--white)}
button:disabled{opacity:.4;cursor:default}
button:disabled:hover{background:var(--white);color:var(--ink)}
button.primary{background:var(--leaf);border-color:var(--leaf);color:#fff}
button.primary:hover{background:#245f3c}
button.ghost{border-color:var(--line)}
:focus-visible{outline:3px solid var(--gold);outline-offset:2px}

/* ---------- header ---------- */
.top{border-bottom:3px solid var(--ink);padding-bottom:14px;margin-bottom:20px}
.eyebrow{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--rust);font-weight:600;letter-spacing:.4px}
.top h1{font-size:34px;margin:6px 0 8px;line-height:1.15}
.top p{margin:0;color:var(--ink-soft);max-width:760px}
.crumbs{display:flex;gap:14px;flex-wrap:wrap;margin-top:12px}
.crumbs a{font-family:'IBM Plex Mono',monospace;font-size:11.5px;font-weight:600;color:var(--teal);text-decoration:none;border-bottom:1px solid var(--teal)}
.crumbs a:hover{color:var(--rust);border-color:var(--rust)}
.chips{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}
.chip{font-family:'IBM Plex Mono',monospace;font-size:11px;font-weight:700;padding:3px 9px;border-radius:20px;border:1px solid var(--line);background:var(--white);color:var(--muted)}
.chip.a{color:var(--sec-a);border-color:var(--sec-a);background:var(--leaf-soft)}
.chip.b{color:var(--sec-b);border-color:var(--sec-b);background:var(--rust-soft)}
.chip.c{color:var(--sec-c);border-color:var(--sec-c);background:#E6E9F5}

/* ---------- panels ---------- */
.panel{background:var(--white);border:1px solid var(--line);border-radius:6px;box-shadow:0 2px 0 var(--line);padding:22px 24px;margin-top:22px}
.panel h2{margin:0 0 4px;font-size:22px}
.panel .sub{margin:0 0 14px;color:var(--muted);font-size:14px}
.step-tag{font-family:'IBM Plex Mono',monospace;font-size:11px;font-weight:700;color:var(--leaf);letter-spacing:.5px;text-transform:uppercase}

/* ---------- path stepper ---------- */
.path{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
@media(max-width:720px){.path{grid-template-columns:1fr 1fr}}
.path a{display:flex;gap:10px;align-items:center;text-decoration:none;color:var(--ink);background:var(--paper-deep);border:1px solid var(--line);border-radius:5px;padding:10px 12px}
.path .num{flex:none;width:28px;height:28px;border-radius:50%;display:grid;place-items:center;font-family:'IBM Plex Mono',monospace;font-weight:700;font-size:13px;border:2px solid var(--ink);background:var(--white)}
.path a.done .num{background:var(--leaf);border-color:var(--leaf);color:#fff}
.path b{display:block;font-size:14px}
.path small{display:block;font-family:'IBM Plex Mono',monospace;font-size:10.5px;color:var(--muted)}

/* ---------- video player ---------- */
.player{background:#10172B;border-radius:8px;overflow:hidden;box-shadow:0 14px 30px -18px rgba(28,37,65,.6)}
.screen{position:relative;aspect-ratio:16/9;background:var(--white);overflow:hidden}
@media(max-width:720px){.screen{aspect-ratio:auto;min-height:560px}}
.scene{position:absolute;inset:0;display:grid;grid-template-columns:1.25fr 1fr;gap:3.5%;padding:3.6% 4% 12.5%;}
@media(max-width:720px){.scene{position:relative;grid-template-columns:1fr;padding:18px 16px 90px;gap:14px}}
.scene::before{content:"";position:absolute;left:0;top:0;width:6px;height:100%;background:var(--leaf)}
.scene .vis{background:var(--paper-deep);border:1px dashed var(--line);border-radius:6px;display:flex;align-items:center;justify-content:center;padding:10px;overflow:hidden;min-height:0}
.scene .vis svg{width:100%;height:100%;max-height:100%}
.scene .txt{display:flex;flex-direction:column;min-height:0;overflow:auto}
.scene .k{font-family:'IBM Plex Mono',monospace;font-size:clamp(10px,1.2vw,12.5px);color:var(--rust);font-weight:700;letter-spacing:.4px;text-transform:uppercase}
.scene h3{font-size:clamp(18px,2.6vw,28px);margin:2px 0 10px;line-height:1.15}
.scene ul{margin:0;padding:0;list-style:none}
.scene li{font-size:clamp(13px,1.45vw,16px);margin:0 0 8px;padding-left:22px;position:relative;opacity:.12;transform:translateY(6px);transition:opacity .5s,transform .5s}
.scene li::before{content:"";position:absolute;left:2px;top:.55em;width:10px;height:10px;border-radius:50%;background:var(--leaf)}
.scene li.on{opacity:1;transform:none}
.scene li b{color:var(--leaf)}
.caption{position:absolute;left:0;right:0;bottom:0;padding:10px 18px 12px;background:linear-gradient(transparent,rgba(16,23,43,.92) 30%);color:#fff;font-size:clamp(12.5px,1.35vw,15px);min-height:13%;display:flex;align-items:flex-end}
.caption span{max-width:92%}
.title-card{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:30px;
  background:radial-gradient(circle at 30% 20%,#2F7D4F 0,#1C2541 60%);color:#fff;z-index:3;transition:opacity .4s}
.title-card.hide{opacity:0;pointer-events:none}
.title-card .k{font-family:'IBM Plex Mono',monospace;font-size:13px;color:#BFE3C9;letter-spacing:1px}
.title-card h3{font-size:clamp(22px,3.6vw,40px);margin:8px 0 6px}
.title-card p{margin:0 0 20px;color:#D8DDEA;max-width:560px}
.bigplay{width:74px;height:74px;border-radius:50%;border:none;background:#fff;color:var(--leaf);font-size:28px;display:grid;place-items:center;padding:0 0 0 6px;box-shadow:0 8px 24px rgba(0,0,0,.35)}
.bigplay:hover{background:var(--gold-soft);color:var(--leaf)}
.controls{display:flex;align-items:center;gap:8px;padding:10px 12px;background:#10172B;flex-wrap:wrap}
.controls button{background:transparent;color:#fff;border-color:#3b4668;padding:7px 11px}
.controls button:hover{background:#2a3456}
.controls button.on{background:var(--leaf);border-color:var(--leaf)}
.scrub{flex:1 1 180px;display:flex;gap:3px;min-width:140px}
.scrub i{flex:1;height:8px;border-radius:3px;background:#3b4668;cursor:pointer;position:relative;overflow:hidden}
.scrub i.seen{background:#5e7d6a}
.scrub i.cur{background:#8fd1a6}
.scrub i .fill{position:absolute;left:0;top:0;bottom:0;background:#fff;opacity:.55;width:0}
.ctime{font-family:'IBM Plex Mono',monospace;font-size:11.5px;color:#c7cde0;min-width:88px;text-align:right}
.voice-note{font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--muted);margin:8px 2px 0}

/* visual widgets */
.w-flow{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:6px;width:100%}
.w-flow .n{background:var(--white);border:2px solid var(--ink);border-radius:6px;padding:7px 10px;font-weight:600;font-size:clamp(11px,1.3vw,14px);text-align:center;max-width:160px}
.w-flow .n small{display:block;font-family:'IBM Plex Mono',monospace;font-size:10px;color:var(--muted);font-weight:500}
.w-flow .ar{font-size:20px;color:var(--leaf);font-weight:700}
.w-flow.col{flex-direction:column}
.w-flow.col .ar{transform:rotate(90deg);line-height:1}
.w-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:8px;width:100%}
.w-cards .c{background:var(--white);border:1.5px solid var(--ink);border-radius:6px;padding:8px 9px}
.w-cards .c b{display:block;font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--rust);margin-bottom:3px}
.w-cards .c span{font-size:clamp(10.5px,1.15vw,12.5px);line-height:1.35;display:block}
.w-table{width:100%;border-collapse:collapse;font-size:clamp(10.5px,1.15vw,13px);background:var(--white)}
.w-table th{background:var(--ink);color:#fff;font-family:'IBM Plex Mono',monospace;font-size:11px;padding:6px;text-align:left}
.w-table td{border:1px solid var(--line);padding:5px 6px;vertical-align:top}
.w-table tr:nth-child(even) td{background:var(--paper-deep)}
.w-eq{font-family:'IBM Plex Mono',monospace;font-size:clamp(12px,1.5vw,17px);background:var(--white);border:2px solid var(--ink);border-radius:6px;padding:12px 14px;text-align:center;line-height:1.7}
.w-eq .sm{display:block;font-size:.78em;color:var(--muted)}
.w-big{text-align:center}
.w-big .v{font-size:clamp(34px,6vw,64px);font-weight:700;color:var(--leaf);line-height:1}
.w-big .l{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--muted)}
.anim > *{animation:pop .55s both}
.anim > *:nth-child(2){animation-delay:.25s}.anim > *:nth-child(3){animation-delay:.5s}.anim > *:nth-child(4){animation-delay:.75s}
.anim > *:nth-child(5){animation-delay:1s}.anim > *:nth-child(6){animation-delay:1.25s}.anim > *:nth-child(7){animation-delay:1.5s}
.anim > *:nth-child(8){animation-delay:1.75s}.anim > *:nth-child(9){animation-delay:2s}.anim > *:nth-child(10){animation-delay:2.25s}
.anim > *:nth-child(n+11){animation-delay:2.5s}
@keyframes pop{from{opacity:0;transform:translateY(8px) scale(.97)}to{opacity:1;transform:none}}
svg .draw{stroke-dasharray:1200;stroke-dashoffset:1200;animation:draw 2.4s ease forwards}
@keyframes draw{to{stroke-dashoffset:0}}
svg .fade{opacity:0;animation:fadein .6s forwards}
@keyframes fadein{to{opacity:1}}
svg text{font-family:'IBM Plex Mono',monospace}
@media (prefers-reduced-motion:reduce){.anim > *,svg .draw,svg .fade{animation:none;opacity:1;stroke-dashoffset:0}.scene li{transition:none}}

/* ---------- notes ---------- */
.notes{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:12px}
.note{background:var(--paper);border:1px solid var(--line);border-left:4px solid var(--leaf);border-radius:4px;padding:12px 14px}
.note h4{margin:0 0 4px;font-size:15.5px}
.note p{margin:0;font-size:14px;color:#2d2a22}
.tips{margin-top:14px;background:var(--gold-soft);border:1px solid #e4cf9e;border-radius:5px;padding:12px 16px}
.tips h4{margin:0 0 6px;font-family:'IBM Plex Mono',monospace;font-size:12px;color:#7a5a17;letter-spacing:.4px}
.tips ul{margin:0;padding-left:18px}.tips li{font-size:14px;margin:3px 0}

/* ---------- practice ---------- */
.q{border:1px solid var(--line);border-radius:5px;padding:14px 16px;margin:12px 0;background:var(--white)}
.q .src{font-family:'IBM Plex Mono',monospace;font-size:10.5px;color:var(--teal);font-weight:600;margin-bottom:4px}
.q .stem{font-weight:600;margin:0 0 8px}
.q label{display:flex;gap:9px;align-items:flex-start;padding:6px 8px;border-radius:4px;cursor:pointer;font-size:14.5px}
.q label:hover{background:var(--paper)}
.q input[type=radio]{margin-top:4px;accent-color:var(--leaf)}
.q.right{border-color:var(--leaf);background:#f5fbf6}
.q.wrong{border-color:var(--rust);background:#fdf6f6}
.q label.correct{background:var(--leaf-soft);font-weight:600}
.q label.picked-wrong{background:var(--rust-soft);text-decoration:line-through}
.fb{font-size:13.5px;margin-top:6px;display:none;padding:8px 10px;border-radius:4px;background:var(--paper)}
.q.checked .fb{display:block}
.score{font-family:'IBM Plex Mono',monospace;font-weight:700;font-size:15px;margin-left:10px}
.sq .parts{margin:8px 0 0}
.sq .part{margin:10px 0 14px;padding-left:12px;border-left:3px solid var(--paper-deep)}
.sq .part p{margin:0 0 6px}
.sq .mk{font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--muted);font-weight:700}
.sq textarea{width:100%;min-height:70px;font-family:'Lora',serif;font-size:14px;padding:8px 10px;border:1px solid var(--line);border-radius:4px;background:#fffef9;resize:vertical}
.scheme{display:none;margin-top:8px;background:var(--teal-soft);border:1px solid #bcd6cf;border-radius:4px;padding:10px 12px}
.scheme.show{display:block}
.scheme h5{margin:0 0 6px;font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--teal)}
.scheme label{display:flex;gap:8px;align-items:flex-start;font-size:14px;margin:4px 0;cursor:pointer}
.scheme input{margin-top:4px;accent-color:var(--leaf)}
.sq-foot{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:6px}
.refs{margin:0;padding-left:18px}.refs li{font-size:14px;margin:3px 0}

/* ---------- readiness ---------- */
.ready{display:grid;grid-template-columns:auto 1fr;gap:22px;align-items:center}
@media(max-width:640px){.ready{grid-template-columns:1fr;justify-items:center;text-align:center}}
.ring{--p:0;--c:var(--rust);width:132px;height:132px;border-radius:50%;background:conic-gradient(var(--c) calc(var(--p)*1%),var(--paper-deep) 0);display:grid;place-items:center}
.ring > div{width:102px;height:102px;border-radius:50%;background:var(--white);display:grid;place-items:center;text-align:center}
.ring b{font-size:30px;line-height:1}
.ring small{font-family:'IBM Plex Mono',monospace;font-size:10px;color:var(--muted)}
.status{font-family:'IBM Plex Mono',monospace;font-size:12px;font-weight:700;padding:4px 11px;border-radius:20px;display:inline-block}
.st0{background:var(--paper-deep);color:var(--muted)}
.st1{background:var(--rust-soft);color:var(--rust)}
.st2{background:var(--gold-soft);color:#7a5a17}
.st3{background:var(--teal-soft);color:var(--teal)}
.st4{background:var(--leaf-soft);color:var(--leaf)}
.bars{display:grid;gap:8px;margin-top:10px}
.bar{display:grid;grid-template-columns:150px 1fr 44px;gap:10px;align-items:center;font-size:13.5px}
@media(max-width:640px){.bar{grid-template-columns:1fr 44px}.bar .bl{grid-column:1/-1;text-align:left}}
.bar .track{height:10px;background:var(--paper-deep);border-radius:6px;overflow:hidden}
.bar .track span{display:block;height:100%;background:var(--leaf);border-radius:6px;transition:width .6s}
.bar .pct{font-family:'IBM Plex Mono',monospace;font-size:12px;text-align:right}
.lesson-nav{display:flex;justify-content:space-between;gap:12px;margin-top:26px;flex-wrap:wrap}
.lesson-nav a{font-family:'IBM Plex Mono',monospace;font-size:12.5px;font-weight:700;text-decoration:none;background:var(--white);border:1.5px solid var(--ink);color:var(--ink);padding:10px 14px;border-radius:3px}
.lesson-nav a:hover{background:var(--ink);color:#fff}

/* ---------- library index ---------- */
.dash{display:grid;grid-template-columns:1.1fr 1fr;gap:22px}
@media(max-width:860px){.dash{grid-template-columns:1fr}}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:14px}
.stats div{background:var(--paper);border:1px solid var(--line);border-radius:4px;padding:8px;text-align:center}
.stats b{display:block;font-size:20px}
.stats span{font-family:'IBM Plex Mono',monospace;font-size:10px;color:var(--muted)}
.next-box{background:var(--leaf-soft);border:1px solid #b9d7c0;border-radius:5px;padding:12px 14px;margin-top:12px}
.next-box a{font-weight:700}
.module-block{margin-top:36px}
.module-head{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:4px}
.module-head h2{margin:0;font-size:23px}
.module-desc{font-size:14px;color:var(--muted);margin:0 0 12px;max-width:780px}
.topic-title{font-family:'IBM Plex Mono',monospace;font-size:11.5px;font-weight:700;color:var(--muted);margin:16px 0 8px;letter-spacing:.4px;text-transform:uppercase}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px}
.card{background:var(--white);border:1px solid var(--line);border-radius:5px;padding:14px 16px;text-decoration:none;color:var(--ink);box-shadow:0 2px 0 var(--line);display:flex;flex-direction:column;gap:6px;transition:transform .12s,box-shadow .12s;border-top:4px solid var(--sec-a)}
.card.b{border-top-color:var(--sec-b)}.card.c{border-top-color:var(--sec-c)}
.card:hover{transform:translateY(-2px);box-shadow:0 6px 0 var(--line)}
.card .obj{font-family:'IBM Plex Mono',monospace;font-size:10.5px;color:var(--teal);font-weight:700}
.card h3{margin:0;font-size:16.5px;line-height:1.3}
.card p{margin:0;font-size:13px;color:var(--ink-soft);flex-grow:1}
.card .mini{display:flex;align-items:center;gap:8px}
.card .mini .track{flex:1;height:7px;background:var(--paper-deep);border-radius:4px;overflow:hidden}
.card .mini .track span{display:block;height:100%;background:var(--leaf)}
.card .mini em{font-family:'IBM Plex Mono',monospace;font-style:normal;font-size:11px;font-weight:700;min-width:36px;text-align:right}
.card .meta{font-family:'IBM Plex Mono',monospace;font-size:10.5px;color:var(--muted)}
.howto{counter-reset:s;display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:12px;padding:0;list-style:none;margin:10px 0 0}
.howto li{background:var(--paper);border:1px solid var(--line);border-radius:5px;padding:12px 14px;font-size:14px}
.howto li::before{counter-increment:s;content:"STEP " counter(s);display:block;font-family:'IBM Plex Mono',monospace;font-size:11px;font-weight:700;color:var(--leaf);margin-bottom:3px}
.fmt{width:100%;border-collapse:collapse;font-size:14px;margin-top:8px}
.fmt th,.fmt td{border:1px solid var(--line);padding:7px 9px;text-align:left;vertical-align:top}
.fmt th{background:var(--paper-deep);font-family:'IBM Plex Mono',monospace;font-size:11.5px}
.tools{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
footer{margin-top:44px;padding-top:14px;border-top:1px solid var(--line);font-size:12px;color:#8a8266;font-family:'IBM Plex Mono',monospace}
.src-list{font-size:13px;color:var(--ink-soft)}
.src-list li{margin:3px 0}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

.chip.x{color:#7a5a17;border-color:var(--sec-x);background:var(--gold-soft)}
.chip.e{color:var(--sec-e);border-color:var(--sec-e);background:#E3F0F5}
.chip.l{color:var(--sec-l);border-color:var(--sec-l);background:var(--teal-soft)}
.card.x{border-top-color:var(--sec-x)}.card.e{border-top-color:var(--sec-e)}.card.l{border-top-color:var(--sec-l)}
a.jump{font-family:'IBM Plex Mono',monospace;font-size:12px;font-weight:700;text-decoration:none;background:var(--white);border:1.5px solid var(--ink);color:var(--ink);padding:8px 12px;border-radius:3px}
a.jump:hover{background:var(--ink);color:#fff}
.video-frame{position:relative;aspect-ratio:16/9;background:#000;border-radius:8px;overflow:hidden}
.video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
video.nlm-video{width:100%;border-radius:8px;background:#000;display:block}
/* mock exam */
.mock-bar{position:sticky;top:0;z-index:5;display:flex;gap:12px;align-items:center;flex-wrap:wrap;background:var(--ink);color:#fff;padding:10px 14px;border-radius:6px;margin-top:18px}
.mock-bar .timer{font-family:'IBM Plex Mono',monospace;font-size:20px;font-weight:700;min-width:84px}
.mock-bar .timer.low{color:#ffb4b4}
.mock-bar .answered{font-family:'IBM Plex Mono',monospace;font-size:12px}
.mock-bar button{background:transparent;color:#fff;border-color:#6b7699}
.mock-bar button.primary{background:var(--leaf);border-color:var(--leaf)}
.sheet{display:grid;grid-template-columns:repeat(auto-fill,minmax(34px,1fr));gap:4px;margin-top:10px}
.sheet a{font-family:'IBM Plex Mono',monospace;font-size:11px;text-align:center;padding:5px 0;border:1px solid var(--line);border-radius:3px;text-decoration:none;color:var(--ink);background:var(--white)}
.sheet a.done{background:var(--teal-soft);border-color:var(--teal)}
.sheet a.right{background:var(--leaf-soft);border-color:var(--leaf)}
.sheet a.wrong{background:var(--rust-soft);border-color:var(--rust)}
.q .qsec{font-family:'IBM Plex Mono',monospace;font-size:10.5px;color:var(--muted)}

/* ---------- maths notation ---------- */
.frac{display:inline-block;vertical-align:middle;text-align:center;line-height:1.15;margin:0 .12em}
.frac>span{display:block;padding:0 .2em}
.frac>span:first-child{border-bottom:1.5px solid currentColor}
sup,sub{line-height:0;font-size:.72em}
.w-eq .ok{color:var(--leaf);font-weight:700}
.w-eq .no{color:var(--rust);font-weight:700}
.w-eq .hl{background:var(--gold-soft);padding:0 .25em;border-radius:3px}
.stem .frac,.note .frac,.scheme .frac,.fb .frac,.part .frac{font-size:.95em}
.mat{display:inline-block;vertical-align:middle;border-left:2px solid currentColor;border-right:2px solid currentColor;border-radius:7px;padding:1px 7px;margin:0 3px;line-height:1.35}
.mat .mr{display:flex;gap:12px;justify-content:center}
.mat i{font-style:normal;min-width:1.1em;text-align:center}
.w-eq{font-size:clamp(14px,1.8vw,20px)}
.w-table{font-size:clamp(11.5px,1.25vw,14px)}
/* Section 4 (probability & statistics) accent */
:root{--sec-d:#7A4B9A}
.chip.d{color:var(--sec-d);border-color:var(--sec-d);background:#EFE6F5}
.card.d{border-top-color:var(--sec-d)}

/* ---------- integrated projects ---------- */
:root{--s-math:#2F7D4F;--s-addm:#4B5FA8;--s-phys:#2C7FA0;--s-chem:#B33A3A;--s-bio:#3E7C74;--s-it:#B7862B}
.chip.s-math{color:var(--s-math);border-color:var(--s-math)}.chip.s-addm{color:var(--s-addm);border-color:var(--s-addm)}.chip.s-phys{color:var(--s-phys);border-color:var(--s-phys)}
.chip.s-chem{color:var(--s-chem);border-color:var(--s-chem)}.chip.s-bio{color:var(--s-bio);border-color:var(--s-bio)}.chip.s-it{color:var(--s-it);border-color:var(--s-it)}
.s-math-bg{background:var(--s-math)}.s-addm-bg{background:var(--s-addm)}.s-phys-bg{background:var(--s-phys)}.s-chem-bg{background:var(--s-chem)}.s-bio-bg{background:var(--s-bio)}.s-it-bg{background:var(--s-it)}
.bar .track span{display:block;height:100%;border-radius:4px;transition:width .3s}
.s-math-panel{border-left:6px solid var(--s-math)}.s-addm-panel{border-left:6px solid var(--s-addm)}.s-phys-panel{border-left:6px solid var(--s-phys)}
.s-chem-panel{border-left:6px solid var(--s-chem)}.s-bio-panel{border-left:6px solid var(--s-bio)}.s-it-panel{border-left:6px solid var(--s-it)}
.note-small{font-size:12.5px;color:var(--muted);margin:12px 0 0}
.howbox{margin-top:14px;background:var(--teal-soft);border:1px solid #b9d0c8;border-radius:5px;padding:12px 16px;font-size:14px}
.role{margin-top:12px;background:var(--gold-soft);border:1px solid #e4cf9e;border-radius:5px;padding:12px 16px;font-size:14.5px}
.connect{display:grid;gap:12px}
.crow{background:var(--paper);border:1px solid var(--line);border-radius:5px;padding:12px 16px}
.crow h3{margin:0 0 4px;font-size:16px}.crow p{margin:0 0 8px;font-size:14px;color:var(--ink-soft)}
.clinks{display:flex;flex-wrap:wrap;gap:6px}
.clinks a,.skills a,.matrix a{font-family:'IBM Plex Mono',monospace;font-size:11.5px;font-weight:600;text-decoration:none;background:var(--white);border:1px solid var(--line);border-radius:3px;padding:2px 7px;color:var(--teal);display:inline-block;margin:1px 2px 1px 0}
.clinks a:hover,.skills a:hover,.matrix a:hover{background:var(--ink);color:#fff;border-color:var(--ink)}
.skills{font-size:13.5px;margin:6px 0 14px;line-height:2}
.dataset{background:var(--paper);border:1px solid var(--line);border-radius:5px;padding:10px 14px;margin:0 0 14px;font-size:14px;overflow-x:auto}
.dataset table{border-collapse:collapse;margin-top:6px}.dataset th,.dataset td{border:1px solid var(--line);padding:4px 12px;text-align:center;font-family:'IBM Plex Mono',monospace;font-size:13px}.dataset th{background:var(--paper-deep)}
.qs{list-style:none;counter-reset:q;padding:0;margin:0;display:grid;gap:12px}
.q{counter-increment:q;border:1px solid var(--line);border-radius:5px;padding:12px 16px;background:var(--white)}
.qh{display:flex;justify-content:space-between;gap:12px;align-items:flex-start}
.qt::before{content:counter(q) ". ";font-weight:700;font-family:'IBM Plex Mono',monospace}
.mk{font-family:'IBM Plex Mono',monospace;font-size:12px;font-weight:700;color:var(--rust);white-space:nowrap}
.q details{margin-top:8px}.q summary{cursor:pointer;font-family:'IBM Plex Mono',monospace;font-size:12.5px;font-weight:600;color:var(--teal)}
.ans{margin-top:8px;padding:10px 14px;background:var(--leaf-soft);border:1px solid #b9d6bf;border-radius:4px;font-size:14px}
.ans p{margin:0 0 6px}.ans ul{margin:4px 0 6px;padding-left:20px}
.att{display:block;margin-top:8px;font-size:13px;color:var(--muted)}
.tm{margin:10px 0 0;font-family:'IBM Plex Mono',monospace;font-size:12px;font-weight:700;color:var(--muted);text-align:right}
.mini-h{margin:16px 0 6px;font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.4px;color:var(--rust);text-transform:uppercase}
.checks{list-style:none;padding:0;margin:0;display:grid;gap:6px}.checks label{font-size:14.5px}
.rub{border-collapse:collapse;width:100%;font-size:14px}.rub th,.rub td{border:1px solid var(--line);padding:7px 10px;text-align:left;vertical-align:top}.rub th{background:var(--paper-deep);font-family:'IBM Plex Mono',monospace;font-size:12px}
.rub td:last-child{text-align:center;white-space:nowrap}
.career-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
.career{border:1px solid var(--line);border-radius:5px;padding:14px 16px;background:var(--paper)}
.career h3{margin:0 0 6px;font-size:17px}.career p{margin:0 0 6px;font-size:13.5px}.career .uses,.career .path{color:var(--ink-soft)}
.refl{padding-left:22px}.refl li{margin:6px 0}
.card.proj .careers-line{font-size:12.5px;color:var(--muted)}
.mwrap{overflow-x:auto}
.matrix{border-collapse:collapse;width:100%;min-width:860px;font-size:13px}
.matrix th,.matrix td{border:1px solid var(--line);padding:7px 8px;vertical-align:top;text-align:left}
.matrix thead th{background:var(--paper-deep);font-family:'IBM Plex Mono',monospace;font-size:11.5px}
.matrix tbody th{background:var(--paper);font-weight:400;min-width:190px}.matrix tbody th b{display:block;font-size:14px}.matrix tbody th span{font-size:12px;color:var(--muted)}
.matrix .none{color:#b8b098}.matrix a.pj{background:var(--ink);color:#fff;border-color:var(--ink)}
.s-math-h{color:var(--s-math)}.s-addm-h{color:var(--s-addm)}.s-phys-h{color:var(--s-phys)}.s-chem-h{color:var(--s-chem)}.s-bio-h{color:var(--s-bio)}.s-it-h{color:var(--s-it)}
@media print{.crumbs,.lesson-nav,.edu-brandbar,button,.att{display:none}details{display:block}details>summary{display:none}details .ans{display:block}body{background:#fff;padding:0}.panel{break-inside:avoid;box-shadow:none}}