@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-e:#B7862B; --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.e{color:#7a5a17;border-color:var(--sec-e);background:var(--gold-soft)}
.chip.l{color:var(--sec-l);border-color:var(--sec-l);background:var(--teal-soft)}
.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)}

/* ---------- games ---------- */
.chip.game{text-decoration:none;color:#7a5a17;border-color:var(--gold);background:var(--gold-soft)}
.play{border-top:4px solid var(--gold)}
.xpline{display:flex;flex-wrap:wrap;align-items:center;gap:6px 12px;font-size:13px;margin:0 0 12px}
.xpline:empty{display:none}
.xpline .xpbar{width:140px}
.xpbar{display:inline-block;height:8px;background:var(--paper-deep);border-radius:5px;overflow:hidden;vertical-align:middle}
.xpbar span{display:block;height:100%;background:linear-gradient(90deg,var(--gold),var(--leaf));border-radius:5px;transition:width .6s}
.gtabs{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:10px}
.gtab{font-size:12px;padding:7px 11px;border-radius:999px}
.gtab[aria-selected=true]{background:var(--ink);color:#fff}
.g-stars{color:var(--gold);letter-spacing:1px}.g-stars i{color:#d6cdb4;font-style:normal}
.gtab[aria-selected=true] .g-stars i{color:#6b7280}
.gstage{position:relative;background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:14px;min-height:160px;overflow:hidden}
.g-intro{margin:0 0 10px;font-size:14.5px}.g-how{color:var(--muted);font-size:13px}
.g-tray{display:flex;flex-wrap:wrap;gap:6px;min-height:44px;padding:8px;border:2px dashed var(--line);border-radius:6px;background:var(--white);margin-bottom:10px}
.g-chip{font-family:'Lora',serif;font-size:13.5px;font-weight:600;padding:6px 10px;border-radius:6px;background:var(--white);border:1.5px solid var(--ink);cursor:grab;text-align:left}
.g-chip.picked{background:var(--gold-soft);border-color:var(--gold);box-shadow:0 0 0 3px rgba(183,134,43,.35)}
.g-chip.ok{background:var(--leaf-soft);border-color:var(--leaf)}.g-chip.bad{background:var(--rust-soft);border-color:var(--rust)}
.g-bins{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:8px}
.g-bin{background:var(--white);border:1.5px solid var(--line);border-radius:6px;min-height:90px;cursor:pointer;display:flex;flex-direction:column}
.g-bin.over{border-color:var(--gold);background:var(--gold-soft)}
.g-bin-h{font-family:'IBM Plex Mono',monospace;font-size:11.5px;font-weight:700;background:var(--ink);color:#fff;padding:6px 8px;border-radius:4px 4px 0 0}
.g-drop{display:flex;flex-wrap:wrap;gap:5px;padding:7px;flex:1}
.g-foot{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:12px}
.g-msg{font-size:13.5px;color:var(--ink-soft)}
.g-order{list-style:none;margin:0;padding:0}
.g-step{display:flex;align-items:center;gap:8px;background:var(--white);border:1.5px solid var(--line);border-radius:6px;padding:6px 8px;margin:5px 0;cursor:grab}
.g-step.ok{border-color:var(--leaf);background:var(--leaf-soft)}.g-step.bad{border-color:var(--rust);background:var(--rust-soft)}
.g-pos{font-family:'IBM Plex Mono',monospace;font-weight:700;color:var(--muted);min-width:20px}
.g-txt{flex:1;font-size:14px}
.g-mv{padding:3px 8px;font-size:11px}
.g-label{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:12px;align-items:start}
@media (max-width:640px){.g-label{grid-template-columns:1fr}}
.g-label-svg{background:var(--white);border:1px dashed var(--line);border-radius:6px;padding:8px}
.g-label-svg svg{width:100%;height:auto;display:block}
.g-lrow{display:flex;align-items:center;gap:8px;margin:5px 0;font-size:14px}
.g-num{font-size:18px;color:var(--rust);font-weight:700;min-width:22px}
.g-lrow select{flex:1;font-family:'Lora',serif;font-size:14px;padding:5px;border:1.5px solid var(--line);border-radius:4px;background:var(--white);min-width:0}
.g-lrow.ok select{border-color:var(--leaf);background:var(--leaf-soft)}.g-lrow.bad select{border-color:var(--rust);background:var(--rust-soft)}
.g-fix{font-size:12.5px;color:var(--rust)}.g-lrow.ok .g-fix{color:var(--leaf)}
.g-hud{display:flex;flex-wrap:wrap;gap:6px 18px;font-family:'IBM Plex Mono',monospace;font-size:12.5px;margin-bottom:10px}
.g-hud .m{color:var(--rust);font-weight:700;font-style:normal}
.g-mem{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:8px}
.g-card{position:relative;min-height:92px;padding:8px;border-radius:8px;border:1.5px solid var(--ink);background:var(--ink);color:#fff;font-family:'Lora',serif;font-size:12.5px;line-height:1.3;font-weight:500;cursor:pointer;transition:background .25s}
.g-card .back{font-size:26px;font-weight:700;color:var(--gold)}
.g-card .face{display:none}
.g-card.up{background:var(--white);color:var(--ink)}
.g-card.up .back{display:none}.g-card.up .face{display:block}
.g-card.term.up .face{font-weight:700;font-size:14px;color:var(--teal)}
.g-card.done{background:var(--leaf-soft);border-color:var(--leaf);cursor:default}
.g-start{font-size:15px;padding:10px 22px}
.g-mf{font-size:clamp(16px,2.4vw,20px);font-weight:600;background:var(--white);border:2px solid var(--ink);border-radius:8px;padding:18px;min-height:90px;display:flex;align-items:center;transition:background .2s}
.g-mf.ok{background:var(--leaf-soft);border-color:var(--leaf)}.g-mf.bad{background:var(--rust-soft);border-color:var(--rust)}
.g-mf-btns{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:10px}
.g-mf-btns button{font-size:16px;padding:12px}
.g-fact{background:var(--leaf);border-color:var(--leaf);color:#fff}.g-myth{background:var(--rust);border-color:var(--rust);color:#fff}
.g-mf-fb{min-height:40px;font-size:13.5px;margin-top:8px}
.g-result{text-align:center;padding:14px;margin-top:12px;background:var(--white);border:2px solid var(--gold);border-radius:8px}
.g-result .g-big{font-size:40px;font-weight:700;color:var(--leaf);line-height:1}
.g-result .g-stars{font-size:26px}
.g-result p{margin:8px 0 10px;font-size:14px}
.g-result button{margin:3px}
.g-toasts{position:fixed;right:14px;bottom:14px;z-index:50;display:flex;flex-direction:column;gap:8px;max-width:300px}
.g-toast{background:var(--ink);color:#fff;border-radius:8px;padding:10px 14px;font-size:13.5px;box-shadow:0 6px 20px rgba(0,0,0,.25);animation:pop .3s both;transition:opacity .5s,transform .5s}
.g-toast.badge{background:linear-gradient(135deg,#7a5a17,var(--gold))}
.g-toast.out{opacity:0;transform:translateY(10px)}
.g-confetti{position:absolute;inset:0;pointer-events:none;overflow:hidden}
.g-confetti span{position:absolute;top:-20px;font-size:20px;animation:fall 1.8s ease-in forwards}
@keyframes fall{to{transform:translateY(420px) rotate(360deg);opacity:0}}
/* game zone on the index */
.gz{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:14px;align-items:stretch}
@media (max-width:640px){.gz{grid-template-columns:1fr}}
.gz-level{background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:12px 14px}
.gz-lv{font-family:'IBM Plex Mono',monospace;font-size:12px;font-weight:700;color:var(--rust)}
.gz-title{font-size:22px;font-weight:700;margin:2px 0 8px}
.gz-level .xpbar{width:100%;height:10px;margin-bottom:6px}
.gz-level small{font-size:12.5px;color:var(--muted)}
.gz-arcade{display:flex;flex-direction:column;gap:4px;text-decoration:none;color:#fff;background:linear-gradient(135deg,var(--ink),#3b4a7a);border-radius:6px;padding:14px 16px}
.gz-arcade b{font-size:20px;color:#f6d98a}.gz-arcade span{font-size:13.5px}.gz-arcade em{font-style:normal;font-family:'IBM Plex Mono',monospace;font-size:12px;color:#f6d98a;margin-top:auto}
.gz-arcade:hover{filter:brightness(1.1)}
.badges{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px;margin-top:6px}
.badge{display:flex;flex-direction:column;align-items:center;text-align:center;gap:2px;background:var(--paper);border:1px dashed var(--line);border-radius:6px;padding:9px;opacity:.6}
.badge span{font-size:24px}.badge b{font-size:13px}.badge small{font-size:11.5px;color:var(--muted)}
.badge.got{opacity:1;border:1.5px solid var(--gold);background:var(--gold-soft)}
/* blitz */
.blitz .g-hud{font-size:14px}
.g-bq{background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:14px}
.g-bsrc{font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--teal);font-weight:700}
.g-bstem{font-weight:600;font-size:16px;margin:4px 0 10px}
.g-bopts{display:grid;gap:7px}
.g-bopts button{font-family:'Lora',serif;font-size:14.5px;font-weight:500;text-align:left;padding:9px 12px;border-radius:6px}
.g-bopts button b{font-family:'IBM Plex Mono',monospace;margin-right:6px}
.g-bopts button.ok{background:var(--leaf-soft);border-color:var(--leaf)}.g-bopts button.bad{background:var(--rust-soft);border-color:var(--rust)}
.g-bfb{font-size:13.5px;margin-top:8px;min-height:20px}
@media (prefers-reduced-motion:reduce){.g-card,.xpbar span,.g-toast{transition:none;animation:none}}

/* ---------- arcade ---------- */
.arc-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px;margin-top:8px}
.arc-card{display:flex;flex-direction:column;gap:4px;text-decoration:none;color:#fff;border-radius:18px;padding:16px;min-height:150px;box-shadow:0 6px 0 rgba(0,0,0,.15);transition:transform .15s}
.arc-card:hover{transform:translateY(-4px) rotate(-.6deg)}
.arc-card .arc-ic{font-size:34px;line-height:1}
.arc-card b{font-size:19px}
.arc-card span:not(.arc-ic){font-size:13.5px;opacity:.95}
.arc-card em{margin-top:auto;font-style:normal;font-size:12px;font-weight:700;background:rgba(255,255,255,.22);border-radius:999px;padding:3px 10px;align-self:flex-start}
.arc-blitz{background:linear-gradient(135deg,#2B1055,#5B3FD6)}.arc-wordlab{background:linear-gradient(135deg,#0E7F96,#13996A)}
.arc-snake{background:linear-gradient(135deg,#2E7D32,#7CB342)}.arc-ladders{background:linear-gradient(135deg,#B5541C,#D9822B)}
.arc-ttt{background:linear-gradient(135deg,#C2185B,#7B1FA2)}.arc-seedling{background:linear-gradient(135deg,#2E8B57,#1F6F43)}
.arc-back{margin:14px 0 0}.arc-back[hidden]{display:none}
.arc-secs{margin:6px 0 4px}
.arc-modal{position:fixed;inset:0;z-index:70;background:rgba(10,20,40,.5);display:flex;align-items:center;justify-content:center;padding:14px}
.arc-q{background:var(--white,#fff);color:var(--ink,#1c2541);border-radius:18px;max-width:600px;width:100%;max-height:92vh;overflow:auto;padding:18px;box-shadow:0 24px 70px rgba(0,0,0,.35)}
.arc-q-h{font-weight:800;font-size:16px;margin-bottom:6px;color:var(--teal,#0A9CC2)}
/* word lab */
.wl-topic{font-size:14px;margin:4px 0 10px}
.wl-k{display:inline-block;padding:0 6px;border-radius:4px;color:#fff;font-weight:700}.wl-k.c{background:#2FA35F}.wl-k.p{background:#D9A21B}.wl-k.a{background:#8A8F98}
.wl-board{display:grid;gap:6px;justify-content:center;margin:6px 0}
.wl-row{display:grid;grid-template-columns:repeat(5,52px);gap:6px}
.wl-row.shake{animation:wlshake .35s}
@keyframes wlshake{25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}
.wl-t{width:52px;height:52px;display:flex;align-items:center;justify-content:center;font-size:26px;font-weight:800;border:2px solid var(--line,#ccc);border-radius:10px;background:var(--white,#fff);text-transform:uppercase}
.wl-t.filled{border-color:var(--ink,#1c2541);animation:pop .15s}
.wl-t.flip{animation:wlflip .35s both;color:#fff;border-color:transparent}
.wl-t.c{background:#2FA35F}.wl-t.p{background:#D9A21B}.wl-t.a{background:#8A8F98}
@keyframes wlflip{0%{transform:rotateX(0)}50%{transform:rotateX(90deg)}100%{transform:rotateX(0)}}
.wl-clue{text-align:center;min-height:22px;font-size:14.5px}
.wl-keys{display:grid;gap:6px;justify-items:center;margin-top:6px}
.wl-kr{display:flex;gap:5px;flex-wrap:nowrap}
.wl-key{min-width:34px;height:44px;padding:0 6px;font-size:15px;font-weight:800;border-radius:8px!important;background:var(--paper-deep,#eee);border:none;color:var(--ink,#1c2541);cursor:pointer}
.wl-key.wide{min-width:58px;font-size:12.5px}
.wl-key.c{background:#2FA35F;color:#fff}.wl-key.p{background:#D9A21B;color:#fff}.wl-key.a{background:#8A8F98;color:#fff}
@media (max-width:480px){.wl-row{grid-template-columns:repeat(5,46px)}.wl-t{width:46px;height:46px;font-size:22px}.wl-key{min-width:27px;height:42px;padding:0 3px;font-size:13px}.wl-key.wide{min-width:46px}.wl-kr{gap:3px}}
/* snake */
.sn-hud{display:flex;flex-wrap:wrap;gap:6px 18px;align-items:center;font-size:15px;margin:6px 0 8px}
.sn-target{background:var(--gold-soft,#FFF0D2);border-radius:999px;padding:4px 12px}
.sn-wrap{position:relative;max-width:640px}
.sn-cv{width:100%;height:auto;display:block;border-radius:14px;border:3px solid var(--leaf,#13996A);background:var(--paper,#fff);touch-action:none}
.sn-over{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(255,255,255,.55);border-radius:14px}
.sn-over[hidden]{display:none}
.sn-end{background:var(--white,#fff);padding:16px 22px;border-radius:14px;text-align:center;box-shadow:0 8px 30px rgba(0,0,0,.2)}
.sn-pad{display:grid;grid-template-columns:repeat(3,56px);grid-template-rows:repeat(2,48px);gap:6px;margin:10px 0 0;justify-content:start}
.sn-pad button{font-size:20px;padding:0}
.sn-pad [data-d=up]{grid-column:2;grid-row:1}.sn-pad [data-d=left]{grid-column:1;grid-row:2}.sn-pad [data-d=down]{grid-column:2;grid-row:2}.sn-pad [data-d=right]{grid-column:3;grid-row:2}
.sn-msg{min-height:22px;font-size:14px}
/* snakes and ladders */
.sl-wrap{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:14px;align-items:start}
@media (max-width:640px){.sl-wrap{grid-template-columns:1fr}}
.sl-board{position:relative;display:grid;grid-template-columns:repeat(6,1fr);aspect-ratio:6/5;border-radius:14px;overflow:hidden;border:3px solid var(--ink,#1c2541)}
.sl-c{background:#FFF6DA;position:relative}.sl-c.alt{background:#FFE3A3}.sl-c.fin{background:#B9F2C8}
.sl-c span{position:absolute;top:3px;left:5px;font-size:12px;font-weight:800;color:#7a5a17}
.sl-svg{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.sl-tok{position:absolute;font-size:clamp(20px,4vw,30px);transition:left .15s,top .15s;filter:drop-shadow(0 2px 2px rgba(0,0,0,.35))}
.sl-side{text-align:center}
.sl-die{font-size:64px;line-height:1.1}
.sl-log{font-size:15px;min-height:44px}
/* noughts and crosses */
.tt-wrap{display:flex;flex-wrap:wrap;gap:18px;align-items:center}
.tt-grid{display:grid;grid-template-columns:repeat(3,92px);grid-template-rows:repeat(3,92px);gap:8px}
.tt-c{font-size:48px;font-weight:800;border-radius:16px!important;background:var(--white,#fff);border:3px solid var(--line,#ccc);color:var(--ink);padding:0}
.tt-c.x{color:var(--rust,#E8505B)}.tt-c.o{color:var(--teal,#0A9CC2)}
.tt-c.win{background:var(--gold-soft,#FFF0D2);border-color:var(--gold,#F29E1F)}
.tt-side{flex:1;min-width:200px;font-size:15px}
/* save the seedling */
.sd-wrap{display:grid;grid-template-columns:180px minmax(0,1fr);gap:16px;align-items:start}
@media (max-width:560px){.sd-wrap{grid-template-columns:1fr}.sd-plant{max-width:160px;margin:auto}}
.sd-svg{width:100%;height:auto}
.sd-clue{font-size:15px;margin:0 0 10px}
.sd-word{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0}
.sd-l{width:30px;height:38px;border-bottom:4px solid var(--ink,#1c2541);display:flex;align-items:flex-end;justify-content:center;font-size:24px;font-weight:800}
.sd-l.on{color:var(--leaf,#13996A)}
.sd-gap{width:16px}
.sd-left{font-size:13.5px;color:var(--muted)}
.sd-keys{display:flex;flex-wrap:wrap;gap:5px;max-width:520px}
@media (prefers-reduced-motion:reduce){.wl-t.flip,.wl-t.filled,.wl-row.shake,.arc-card{animation:none;transition:none}}
@media (max-width:400px){.wl-key{min-width:24px;font-size:12.5px}.wl-key.wide{min-width:40px;font-size:11px}.wl-kr{gap:3px}}