:root{--bg:#101512;--panel:#19201b;--line:#303a31;--muted:#a0ada0;--ink:#edf1e8;--accent:#c4e88b}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.65 system-ui,-apple-system,sans-serif}a{color:inherit;text-decoration:none}a:hover{color:var(--accent)}.sidebar{width:258px;position:fixed;inset:0 auto 0 0;border-right:1px solid var(--line);padding:36px 25px;display:flex;flex-direction:column;background:#151c17}.brand{display:flex;gap:13px;align-items:center;font-weight:800;font-size:13px;letter-spacing:1px}.brand>span{display:block}.brand small{font-size:8px;letter-spacing:1.7px;margin-top:5px;color:var(--muted)}small{display:block;color:var(--muted);font-size:12px}.navlabel{font-size:10px;letter-spacing:2px;color:#79897b;margin-top:60px}nav a{display:block;padding:12px 9px;border-radius:7px;margin:5px 0;color:#bdc8bd}nav a:hover{background:#263426}.sidefoot{margin-top:auto;font-size:12px;color:var(--muted)}.sidefoot strong{color:var(--ink)}.dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--accent);margin-right:5px}main{margin-left:258px;padding:0 55px;max-width:1700px}header{display:flex;justify-content:space-between;gap:15px;align-items:center;padding:26px 0;border-bottom:1px solid var(--line);font-size:10px;letter-spacing:1.5px;color:var(--muted)}.pill{font-size:10px;letter-spacing:1px;border:1px solid var(--line);border-radius:20px;padding:5px 10px;white-space:nowrap}.hero{padding:55px 0 38px;position:relative;overflow:hidden}.eyebrow{color:var(--accent);letter-spacing:2px;font-size:11px;font-weight:600;margin-top:30px}h1{font-size:clamp(32px,4.2vw,62px);line-height:1.12;font-weight:500;letter-spacing:-2px;margin:20px 0 24px;max-width:900px}h1 em{font-family:Georgia,serif;color:var(--accent);font-weight:400}h2{font-size:21px;font-weight:500;line-height:1.35;letter-spacing:-.4px}.intro{max-width:520px}.muted{color:var(--muted)}.button,button{display:inline-block;background:var(--accent);color:#1a2711;border:1px solid transparent;border-radius:6px;padding:11px 18px;font:600 13px system-ui;cursor:pointer;text-align:center}.button:hover,button:hover{background:#d7f4aa;color:#15220e}.secondary{background:transparent;border-color:var(--line);color:var(--ink)}.quiet{background:transparent;color:var(--muted);padding:8px 0;font-size:12px}.hero-art{position:absolute;right:20px;top:75px;transform:rotate(-8deg);width:215px}.hero-art div{border:1px solid #687d50;border-radius:12px;background:linear-gradient(120deg,#364830,#1a231b);padding:18px 24px;margin-bottom:10px;letter-spacing:4px;font:11px monospace;box-shadow:12px 12px 0 #0b100d}.hero-art span{font-size:50px;color:var(--accent)}.stats{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:25px 0;gap:20px}.stats strong{font-size:25px;font-weight:500;display:block}.stats span{color:var(--muted);font-size:11px}.sectionhead{display:flex;justify-content:space-between;align-items:center;gap:16px;margin:25px 0 15px}.sectionhead .muted{font-size:12px}.modules{display:grid;grid-template-columns:1fr 1fr;gap:20px}.panel{border:1px solid var(--line);background:var(--panel);border-radius:10px;padding:25px;margin-bottom:20px;min-width:0}.module{margin:0;display:flex;flex-direction:column;transition:border-color .2s}.module:hover{border-color:#71885b;color:var(--ink)}.module .sectionhead{margin:0}.module .eyebrow{margin:0}.module h2{font-size:24px;margin-bottom:5px}.lessonpreview{margin:15px 0 25px;font-size:13px;color:#b4bfb2}.lessonpreview div{margin:8px 0}.lessonpreview span{color:#77946b;margin-right:7px}.modulelink{color:var(--accent);font-size:12px;margin-top:auto}.back{display:block;margin:30px 0;color:var(--muted);font-size:13px}.actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:20px 0}.prose{line-height:1.85;max-width:100%;overflow-wrap:anywhere}.prose h2{margin-top:32px;color:var(--accent)}.prose a{color:var(--accent);text-decoration:underline}.prose code,pre{font-family:ui-monospace,monospace;background:#0e140f;padding:3px 5px;border-radius:4px}pre{overflow:auto;padding:18px;white-space:pre-wrap;overflow-wrap:anywhere}.prose table{display:block;overflow:auto}.board{margin-top:45px}.forum{border:1px solid var(--line);border-radius:8px;overflow:hidden;margin-bottom:18px}.forumhead{background:#222c23;padding:13px 22px;display:flex;justify-content:space-between;font-size:10px;letter-spacing:2px;color:var(--muted)}.topic{padding:18px 20px;display:flex;justify-content:space-between;gap:15px;align-items:center;border-bottom:1px solid var(--line);overflow-wrap:anywhere}.topic:last-child{border-bottom:0}.topic strong{display:block;font-weight:500}.empty{padding:30px;color:var(--muted);text-align:center}.stack{display:flex;flex-direction:column;gap:18px}.stack button{align-self:flex-start}label{display:block;font-size:13px;color:#c3cec0}input,textarea,select{display:block;width:100%;margin-top:8px;border:1px solid #445141;border-radius:5px;background:#111812;color:var(--ink);font:15px system-ui;padding:12px}input:focus,textarea:focus,select:focus{outline:2px solid #a6ce77;outline-offset:2px}textarea{resize:vertical}summary{cursor:pointer;color:var(--accent)}details[open]>summary{margin-bottom:22px}.auth{max-width:620px;margin:75px auto}.auth h1{font-size:44px}.notice{background:#2d3a22;border:1px solid #5a7044;border-radius:7px;padding:15px;margin:20px 0}.post{display:grid;grid-template-columns:155px 1fr;gap:25px}.author{color:var(--accent);font-weight:600}.plaintext{white-space:pre-wrap;overflow-wrap:anywhere}.post form{grid-column:2}footer{color:#6d7b6d;border-top:1px solid var(--line);font-size:11px;margin-top:55px;padding:24px 0 35px}@media(min-width:1500px){.hero-art{right:90px}}@media(max-width:1100px){main{padding:0 30px}.hero-art{display:none}.sidebar{width:220px}main{margin-left:220px}.stats{grid-template-columns:1fr 1fr}}@media(max-width:700px){.sidebar{position:static;width:auto;padding:20px}.navlabel,.sidefoot{display:none}nav{display:flex;flex-wrap:wrap;margin-top:15px}nav a{font-size:12px;padding:6px 9px;margin:0}.brand small{display:none}main{margin-left:0;padding:0 20px}header{font-size:8px}.pill{font-size:8px}.hero{padding-top:22px}.modules{grid-template-columns:1fr}.sectionhead{flex-wrap:wrap}.stats{gap:15px}h1{letter-spacing:-1px}.panel{padding:20px}.post{grid-template-columns:1fr;gap:14px}.post form{grid-column:1}.auth{margin:35px auto}.auth h1{font-size:35px}}
/* Lab / 03 — a quiet terminal, not a wall of blinking text. */
:root{--bg:#0b1118;--panel:#121d29;--line:#293b4b;--muted:#a0b2c2;--ink:#e9f1f7;--accent:#adf3ba;--cyan:#7ddde8}body{background:radial-gradient(ellipse at 90% 0,#18334566,transparent 55%),var(--bg)}.sidebar{background:#0e1822}.brand{color:var(--accent)}.brand small{color:#94a9bb}.sidebar nav a[aria-current=page]{background:#203346;color:var(--accent);box-shadow:inset 3px 0 var(--accent)}.navlabel,.sidefoot,footer{color:#9baebe}header{font-family:ui-monospace,monospace}.pill{color:var(--cyan)}.hero{min-height:365px;padding-right:340px}.hero h1{font-weight:650;letter-spacing:-2px}.hero h1 em{font-family:inherit;font-style:normal;color:var(--accent)}.hero .intro{font-size:16px}.stats{background:#10212b80;border-radius:10px;padding:23px}.stats strong{color:var(--cyan);font-family:ui-monospace,monospace}.path-tools{border:1px solid var(--line);border-radius:12px;background:#101c28;padding:20px;margin:24px 0}.path-tools input{max-width:600px;background:#09131d;border-color:#456178}.filter-chips{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}.filter-chips button{background:transparent;color:var(--muted);border-color:var(--line);padding:8px 13px;border-radius:25px}.filter-chips button[aria-pressed=true]{color:#091a14;background:var(--accent)}#search-count{font-size:12px;margin:12px 0 0}.module{position:relative;background:linear-gradient(130deg,#162635,#101b26);transition:transform .2s,border-color .2s,box-shadow .2s}.module:hover{transform:translateY(-4px);border-color:var(--cyan);box-shadow:0 10px 30px #0003}.module[data-track=bridge]{border-top:2px solid #d9bbff}.module[data-track=foundations]{border-top:2px solid var(--accent)}.module[data-track=engineering]{border-top:2px solid var(--cyan)}.module h2{font-weight:600}.module-progress{margin:auto 0 18px;color:var(--muted);font:11px ui-monospace,monospace}.module-progress progress{display:block;width:100%;height:5px;margin-top:10px;appearance:none;border:0;border-radius:5px;overflow:hidden;background:#293b4b}.module-progress progress::-webkit-progress-bar{background:#293b4b}.module-progress progress::-webkit-progress-value{background:var(--accent)}.module-progress progress::-moz-progress-bar{background:var(--accent)}.modulelink{margin-top:0}.lessonpreview{color:#becdda}.lessonpreview span{color:var(--accent)}.reading-layout{display:grid;grid-template-columns:210px minmax(0,1fr);gap:22px;align-items:start}.lesson-outline{position:sticky;top:20px;max-height:85vh;overflow:auto;font-size:12px;border-left:1px solid var(--line);padding:12px}.lesson-outline nav a{font-size:12px;margin:0;padding:7px 6px;line-height:1.5}.lesson-outline .subheading{padding-left:16px;color:var(--muted)}.lesson-outline>a{color:var(--accent);display:block;margin-top:18px}.lesson-tools{display:flex;gap:20px;align-items:center;margin:20px 0}.lesson-tools span{font:12px monospace}.prose{background:#101b25}.prose h2,.prose h3{scroll-margin-top:25px}.prose p,.prose li{max-width:80ch}.prose code,pre{background:#07121b}.code-shell{position:relative;border:1px solid #314858;border-radius:8px;margin:20px 0;background:#07121b;padding-top:42px}.code-shell pre{margin:0;padding:16px;border-top:1px solid #233647}.copy-code{position:absolute;right:8px;top:6px;padding:5px 10px;font:11px monospace;background:#223b4d;color:var(--ink)}.notice{background:#1b302b;border-color:#416558}.forumhead{background:#203346}.topic:hover{background:#1e3040}.focus-mode .sidebar,.focus-mode header,.focus-mode .lesson-outline{display:none}.focus-mode main{margin:0 auto;max-width:1100px}.focus-mode .reading-layout{display:block}.focus-mode .lesson-tools{position:sticky;top:0;z-index:5;background:var(--bg);padding:12px 0}.sr-only,.skip-link:not(:focus){position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.skip-link:focus{position:fixed;top:12px;left:12px;z-index:20;background:var(--accent);color:#102018;padding:12px}a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--cyan);outline-offset:4px}[hidden]{display:none!important}@media(max-width:1200px){.hero{padding-right:0}.reading-layout{grid-template-columns:170px minmax(0,1fr)}}@media(max-width:800px){.reading-layout{display:block}.lesson-outline{position:static;max-height:260px;margin-bottom:20px}.hero{min-height:0}.hero h1{font-size:42px}.stats strong{font-size:22px}.lesson-tools{flex-wrap:wrap}.hero{padding-bottom:25px}.module:hover{transform:none}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
/* UI /04: content first, fewer surfaces, more working room. */
body{background:var(--bg)}.sidebar{width:210px;padding:24px 18px}.brand{font-size:11px;letter-spacing:.5px}.brand small{display:none}.sidebar nav{margin-top:24px}.sidebar nav a{font-size:13px;padding:10px 8px}.sidebar .sidefoot{padding-top:24px}main{margin-left:210px;padding:0 32px;max-width:none}header{padding:14px 0;justify-content:flex-start;gap:20px}header button{font-size:12px;padding:7px 11px}h1{font-size:clamp(28px,3vw,42px);letter-spacing:-1px;margin:16px 0}.hero{min-height:0;padding:25px 0;display:flex;gap:24px;align-items:center;justify-content:space-between;overflow:visible}.hero h1{font-size:32px;letter-spacing:-1px;margin:0 0 8px}.hero .intro{font-size:14px;margin:0;max-width:none}.hero .button{flex-shrink:0}.stats{display:flex;flex-wrap:wrap;gap:16px 36px;padding:13px 0;background:none;border-radius:0}.stats>div{display:flex;gap:10px;align-items:baseline}.stats strong{font-size:18px}.stats span{font-size:12px}.sectionhead{margin:20px 0 10px}.path-tools{display:grid;grid-template-columns:minmax(220px,1fr) auto;gap:10px 20px;padding:14px;margin:16px 0}.path-tools label{font-size:12px}.path-tools input{margin-top:5px;padding:10px}.filter-chips{align-items:center;margin:0}.filter-chips button{border-radius:6px;font-size:12px;padding:8px 10px}#search-count{grid-column:1/-1;margin:0}.modules{gap:14px;grid-template-columns:repeat(auto-fit,minmax(min(100%,310px),1fr))}.module{background:var(--panel);transition:none;padding:20px}.module:hover{transform:none;box-shadow:none}.module h2{font-size:20px}.module p{margin:8px 0}.lessonpreview{margin:10px 0 18px;font-size:12px}.module-progress{margin-bottom:12px}.back{margin:20px 0 10px}.eyebrow{margin-top:16px}.review-status{padding:12px 16px;font-size:13px;margin:16px 0}.lesson-actions{gap:10px;margin:16px 0}.secondary-actions{margin-left:auto;display:flex;gap:10px;flex-wrap:wrap}.reading-layout{grid-template-columns:180px minmax(0,1fr);gap:18px}.lesson-outline{font-size:12px}.prose{padding:24px 30px}.nav-collapsed main{margin-left:0}.focus-mode .lesson-actions{position:sticky;top:0;background:var(--bg);z-index:5;padding:10px 0}.focus-mode main{max-width:1200px;margin:auto}.focus-mode .secondary-actions{display:none}.focus-mode .sidebar{display:none}footer{margin-top:32px}@media(max-width:1000px){.path-tools{grid-template-columns:1fr}.filter-chips{justify-content:flex-start}.reading-layout{display:block}.lesson-outline{position:static;max-height:220px;margin-bottom:16px}}@media(max-width:700px){.sidebar{width:auto;padding:16px 20px;position:static}.sidebar nav{margin-top:10px}.sidebar .sidefoot{display:flex;align-items:center;gap:12px;padding-top:10px}.sidefoot small{display:none}.sidefoot form{margin-left:auto}main{margin-left:0;padding:0 18px}header{padding:10px 0}.hero{align-items:flex-start;flex-direction:column;gap:14px;padding:20px 0}.hero h1{font-size:28px}.hero .intro{font-size:13px}.stats{gap:8px 20px}.stats strong{font-size:16px}.stats span{font-size:11px}.secondary-actions{margin-left:0;width:100%}.prose{padding:18px}.modules{grid-template-columns:1fr}.focus-mode .lesson-actions{flex-wrap:wrap}.path-tools{padding:12px}.filter-chips{gap:6px}}