:root{--bg: #0a0b16;--text: #f1f3fb;--muted: #a6acc8;--faint: #717795;--accent: #8aa0ff;--accent-2: #6c7bff;--accent-press: #6d83f5;--accent-soft: rgba(138, 160, 255, .16);--accent-line: rgba(138, 160, 255, .5);--accent-text: #aab8ff;--on-accent: #0a0b16;--glass: rgba(255, 255, 255, .055);--glass-2: rgba(255, 255, 255, .09);--glass-3: rgba(255, 255, 255, .14);--glass-border: rgba(255, 255, 255, .12);--glass-border-hi: rgba(255, 255, 255, .22);--blur: 18px;--shadow: 0 10px 34px rgba(2, 4, 16, .45);--shadow-lg: 0 24px 60px rgba(2, 4, 16, .55);--logo: var(--accent);--copper: #cf9244;--dielectric: #b89a5b;--mask: #3f9b57;--silk: #d7dce4;--r-sm: 12px;--r-md: 16px;--r-lg: 22px;color-scheme:dark;font-family:Nunito,system-ui,sans-serif}:root[data-theme=light]{--bg: #eceefb;--text: #161a2c;--muted: #5a6080;--faint: #8b90ad;--accent: #5b6ee8;--accent-2: #6c5ce7;--accent-press: #4a5cd8;--accent-soft: rgba(91, 110, 232, .12);--accent-line: rgba(91, 110, 232, .38);--accent-text: #4351c4;--on-accent: #ffffff;--glass: rgba(255, 255, 255, .55);--glass-2: rgba(255, 255, 255, .7);--glass-3: rgba(255, 255, 255, .85);--glass-border: rgba(28, 30, 64, .1);--glass-border-hi: rgba(255, 255, 255, .9);--shadow: 0 10px 30px rgba(40, 44, 90, .14);--shadow-lg: 0 24px 54px rgba(40, 44, 90, .18);color-scheme:light}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);overflow:hidden;overscroll-behavior:none}h1,h2,h3{font-family:"Baloo 2",system-ui,sans-serif;margin:0}button{font-family:inherit;cursor:pointer;border:none;color:inherit;background:none}.app{position:fixed;top:0;right:0;bottom:0;left:0;background:radial-gradient(46% 38% at 16% 10%,rgba(124,108,255,.34),transparent 70%),radial-gradient(46% 40% at 90% 16%,rgba(70,108,247,.3),transparent 70%),radial-gradient(54% 46% at 74% 96%,rgba(150,92,255,.26),transparent 72%),radial-gradient(40% 34% at 22% 88%,rgba(46,130,210,.22),transparent 72%),var(--bg)}:root[data-theme=light] .app{background:radial-gradient(46% 38% at 16% 10%,rgba(124,108,255,.22),transparent 70%),radial-gradient(46% 40% at 90% 16%,rgba(70,108,247,.18),transparent 70%),radial-gradient(54% 46% at 74% 96%,rgba(150,92,255,.16),transparent 72%),var(--bg)}.stage{position:absolute;top:0;right:0;bottom:0;left:0;z-index:0}.screen{position:absolute;top:0;right:0;bottom:0;left:0;z-index:2;display:flex;flex-direction:column;padding:max(16px,env(safe-area-inset-top)) 16px max(16px,env(safe-area-inset-bottom))}.glass{background:var(--glass);border:1px solid var(--glass-border);backdrop-filter:blur(var(--blur)) saturate(140%);-webkit-backdrop-filter:blur(var(--blur)) saturate(140%);box-shadow:var(--shadow),inset 0 1px 0 var(--glass-border-hi)}.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:var(--on-accent);font-weight:800;font-size:16px;letter-spacing:.2px;border-radius:var(--r-md);padding:15px 22px;box-shadow:0 8px 24px #6c7bff59;transition:transform .1s ease,filter .15s ease}.btn-primary:active{transform:translateY(1px);filter:brightness(.96)}.btn-primary.big{width:100%;margin-top:auto}.btn-ghost{background:var(--glass-2);color:var(--text);border:1px solid var(--glass-border);border-radius:var(--r-sm);padding:9px 14px;font-weight:700;font-size:14px;backdrop-filter:blur(var(--blur));-webkit-backdrop-filter:blur(var(--blur))}.btn-ghost:active{background:var(--glass-3)}.btn-secondary{background:var(--glass-2);color:var(--text);font-weight:800;font-size:15px;border:1px solid var(--glass-border-hi);border-radius:var(--r-md);padding:13px 20px;backdrop-filter:blur(var(--blur));-webkit-backdrop-filter:blur(var(--blur));transition:background .15s,transform .1s}.btn-secondary.big{width:100%;margin-top:10px}.btn-secondary:active{background:var(--glass-3);transform:translateY(1px)}.logo{display:block;filter:drop-shadow(0 2px 8px rgba(108,123,255,.4))}.logo-plate{fill:var(--logo)}.theme-toggle,.tb-back{width:40px;height:40px;flex:0 0 auto;display:grid;place-items:center;background:var(--glass-2);border:1px solid var(--glass-border);border-radius:12px;color:var(--text);backdrop-filter:blur(var(--blur));-webkit-backdrop-filter:blur(var(--blur));transition:background .15s,transform .1s}.theme-toggle:active,.tb-back:active{background:var(--glass-3);transform:scale(.95)}.topbar{display:flex;align-items:center;gap:12px;min-height:48px;margin-bottom:16px}.tb-titles{flex:1;min-width:0}.tb-title{font-family:"Baloo 2";font-weight:800;font-size:19px;line-height:1.15}.tb-sub{font-size:12.5px;color:var(--muted);margin-top:1px}.tb-right{flex:0 0 auto}.catalog{overflow-y:auto;-webkit-overflow-scrolling:touch}.catalog-head{margin:6px 0 4px}.catalog-bar{display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:10px}.brand h1{font-size:28px;font-weight:800;letter-spacing:-.5px}.catalog-tagline{color:var(--muted);font-size:15px;margin:12px 0 0;line-height:1.4}.catalog-section{font-family:"Baloo 2";font-size:13px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:1.4px;margin:26px 0 14px}.card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;padding-bottom:24px}.subject-card{position:relative;text-align:left;color:var(--text);border-radius:var(--r-lg);padding:0;overflow:hidden;display:flex;flex-direction:column;transition:transform .14s ease,box-shadow .2s ease,border-color .15s}.subject-card:not(.soon){cursor:pointer}.subject-card:not(.soon):hover{transform:translateY(-3px);box-shadow:var(--shadow-lg),inset 0 1px 0 var(--glass-border-hi);border-color:var(--accent-line)}.subject-card:not(.soon):active{transform:translateY(-1px) scale(.99)}.subject-card.soon{opacity:.72}.subject-card.shake{animation:shake .4s}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-5px)}75%{transform:translate(5px)}}.card-cover{position:relative;aspect-ratio:16 / 10;width:100%;overflow:hidden}.card-img{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;object-fit:cover;opacity:.92}.card-cover:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(180deg,transparent 40%,rgba(8,10,22,.55))}:root[data-theme=light] .card-cover:after{background:linear-gradient(180deg,transparent 55%,rgba(255,255,255,.25))}.card-badge{position:absolute;top:10px;left:10px;z-index:1;width:36px;height:36px;border-radius:11px;display:grid;place-items:center;font-size:19px;background:#0a0b1680;border:1px solid rgba(255,255,255,.22);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}.card-lock{position:absolute;top:12px;right:12px;z-index:1;font-size:15px;filter:drop-shadow(0 1px 3px rgba(0,0,0,.5))}.card-body{padding:12px 14px 14px;display:flex;flex-direction:column;gap:5px;flex:1}.card-name{font-family:"Baloo 2";font-weight:700;font-size:16px;line-height:1.15}.card-blurb{color:var(--muted);font-size:12.5px;line-height:1.4;flex:1}.card-go{font-weight:800;font-size:13px;color:var(--accent-text);margin-top:3px}.card-soon{align-self:flex-start;margin-top:3px;font-size:11px;font-weight:800;color:var(--muted);background:var(--glass-2);border:1px solid var(--glass-border);border-radius:999px;padding:3px 11px}.subject-head{display:flex;align-items:center;gap:14px;margin:2px 0 4px}.subject-emoji{width:54px;height:54px;flex:0 0 auto;border-radius:16px;display:grid;place-items:center;font-size:28px;background:var(--glass-2);border:1px solid var(--glass-border);backdrop-filter:blur(var(--blur));-webkit-backdrop-filter:blur(var(--blur))}.subject-head h1{font-size:23px}.subject-head p{color:var(--muted);font-size:13.5px;margin:4px 0 0;line-height:1.4}.intro{align-items:center;justify-content:center;text-align:center}.intro-top{position:absolute;top:max(14px,env(safe-area-inset-top));left:16px;right:16px;z-index:3}.intro-card{border-radius:var(--r-lg);padding:32px 24px;max-width:440px;width:100%}.logo-chip{width:66px;height:66px;margin:0 auto 18px;border-radius:19px;display:grid;place-items:center;background:var(--glass-2);border:1px solid var(--glass-border-hi)}.intro h1{font-size:36px;line-height:1;font-weight:800}.intro h1 span{color:var(--accent-text)}.tagline{color:var(--muted);font-size:15px;line-height:1.5;margin:14px 0 18px}.tagline strong{color:var(--text);font-weight:800}.intro-points{list-style:none;padding:0;margin:0 0 22px;display:grid;gap:8px}.intro-points li{background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--r-sm);padding:11px 14px;font-weight:700;font-size:14.5px;text-align:left}.age-note{display:block;margin-top:12px;color:var(--faint);font-size:12px}.screen-title{font-size:26px;margin-top:4px}.screen-sub{color:var(--muted);font-size:14.5px;line-height:1.5;margin:8px 0 18px}.layer-grid{display:grid;gap:12px;overflow-y:auto;padding-bottom:8px}.layer-card{position:relative;text-align:left;color:var(--text);border-radius:var(--r-md);padding:16px;display:grid;gap:4px;transition:border-color .15s,transform .1s,box-shadow .2s}.layer-card:active{transform:scale(.99)}.layer-card.on{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent),var(--shadow)}.layer-emoji{font-size:26px}.layer-name{font-family:"Baloo 2";font-weight:700;font-size:18px}.layer-blurb{color:var(--muted);font-size:13.5px;line-height:1.45}.ribbon{position:absolute;top:14px;right:14px;font-size:11px;font-weight:800;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:var(--on-accent);padding:4px 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ease}.lesson.peek{max-height:40vh;overflow:hidden}.lesson.expanded{max-height:76vh;overflow-y:auto;-webkit-overflow-scrolling:touch}.lesson-grip{position:absolute;top:7px;left:50%;transform:translate(-50%);padding:6px}.lesson-grip span{display:block;width:38px;height:4px;border-radius:3px;background:var(--glass-3)}.lesson-head{display:flex;align-items:center;gap:10px;margin-top:6px;margin-bottom:4px}.lesson-emoji{font-size:24px}.lesson-head h3{font-size:20px;flex:1}.expand-btn{background:var(--glass-2);color:var(--text);border:1px solid var(--glass-border);border-radius:999px;padding:6px 12px;font-weight:800;font-size:12.5px}.close-btn{width:30px;height:30px;border-radius:50%;font-size:14px;font-weight:800;line-height:1;background:var(--glass-2);color:var(--muted);border:1px solid var(--glass-border)}.close-btn:active{transform:scale(.92)}.lesson-body{font-size:14.5px;line-height:1.55;color:var(--text);margin:10px 0 0}.lesson-body.clamp{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.lesson-tag{display:inline-block;margin-top:12px;font-size:12px;font-weight:700;color:var(--accent-text);background:var(--accent-soft);border:1px solid var(--accent-line);padding:6px 12px;border-radius:999px}.mode-toggle{display:flex;background:var(--glass-2);border-radius:999px;padding:3px;border:1px solid var(--glass-border)}.mode-toggle.inline{margin-top:12px;width:fit-content}.mode-toggle button{color:var(--muted);font-weight:800;font-size:13px;padding:6px 14px;border-radius:999px}.mode-toggle button.on{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:var(--on-accent)}.pills-wrap{margin-top:12px}.pill-rail{display:flex;gap:8px;overflow-x:auto;padding-bottom:6px;scrollbar-width:none}.pill-rail::-webkit-scrollbar{display:none}.pill{flex:0 0 auto;display:flex;align-items:center;gap:7px;background:var(--glass-2);border:1px solid var(--glass-border);border-radius:999px;padding:8px 14px;color:var(--text);font-weight:800;font-size:13px;white-space:nowrap;transition:border-color .15s,background .15s}.pill:active{background:var(--glass-3)}.pill.on{border-color:var(--accent);background:var(--accent-soft);color:var(--accent-text)}.pill-dot{width:11px;height:11px;border-radius:3px;box-shadow:inset 0 0 0 1px #00000059}.pill-note{margin:10px 2px 0;font-size:13.5px;line-height:1.5;color:var(--text);min-height:18px}.stackup{margin-top:14px}.why-note{background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--r-sm);padding:11px 12px;margin:0 0 12px;font-size:13px;line-height:1.5;color:var(--text)}.stackup-head{display:flex;align-items:center;justify-content:space-between;font-size:12px;font-weight:700;color:var(--muted);margin-bottom:8px}.copper-badge{background:var(--accent-soft);color:var(--accent-text);border:1px solid var(--accent-line);border-radius:999px;padding:4px 12px;font-weight:800;font-size:12px}.stackup-list{list-style:none;margin:0;padding:0;display:grid;gap:6px}.stackup-list li{list-style:none}.stack-row{width:100%;text-align:left;color:var(--text);display:grid;grid-template-columns:12px 1fr;gap:4px 10px;align-items:baseline;background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--r-sm);padding:10px 12px;transition:border-color .15s}.stack-row.on{border-color:var(--accent);background:var(--accent-soft)}.stack-dot{width:11px;height:11px;border-radius:3px;align-self:center;box-shadow:inset 0 0 0 1px #00000059}.stack-name{font-weight:800;font-size:14px;color:var(--text)}.stack-num{font-style:normal;font-size:11px;font-weight:800;color:var(--muted);background:var(--glass-3);border-radius:6px;padding:1px 7px;margin-left:8px}.stack-note{grid-column:2;font-size:12.5px;color:var(--muted);line-height:1.4}.chip-rail{position:absolute;left:16px;right:0;bottom:max(14px,env(safe-area-inset-bottom));display:flex;gap:8px;overflow-x:auto;padding:6px 16px 6px 0;scrollbar-width:none;transition:transform .32s cubic-bezier(.4,0,.2,1),opacity .25s ease}.chip-rail.lowered{transform:translateY(180%);opacity:0;pointer-events:none}.chip-rail::-webkit-scrollbar{display:none}.chip{flex:0 0 auto;display:flex;flex-direction:column;align-items:center;gap:3px;background:var(--glass-2);border:1px solid var(--glass-border);border-radius:var(--r-sm);padding:9px 13px;min-width:70px;color:var(--text);backdrop-filter:blur(var(--blur));-webkit-backdrop-filter:blur(var(--blur));transition:border-color .15s,background .15s,transform .1s}.chip:active{transform:scale(.96)}.chip-emoji{font-size:20px}.chip-label{font-weight:800;font-size:12px;white-space:nowrap}.chip.on{border-color:var(--accent);background:var(--accent-soft);color:var(--accent-text)}.journey{position:absolute;top:0;right:0;bottom:0;left:0}.journey-top{position:absolute;top:0;left:0;right:0;z-index:3;padding:max(16px,env(safe-area-inset-top)) 16px 0}.progress{margin-top:2px}.progress-meta{display:flex;align-items:center;justify-content:space-between;margin-bottom:7px}.phase-chip{font-size:11px;font-weight:800;letter-spacing:.4px;text-transform:uppercase;padding:3px 10px;border-radius:999px;border:1px solid var(--glass-border)}.phase-chip.design{color:#a9b6ff;background:#8aa0ff29}.phase-chip.fab{color:#7be0b0;background:#3f9b572e}.phase-chip.assembly{color:#ffb27a;background:#ff8c3c2e}.progress-count{font-size:12px;font-weight:700;color:var(--muted)}.progress-track{height:5px;border-radius:999px;background:var(--glass-2);overflow:hidden;border:1px solid var(--glass-border)}.progress-fill{height:100%;border-radius:999px;background:linear-gradient(90deg,var(--accent),var(--accent-2));transition:width .5s cubic-bezier(.4,0,.2,1)}.journey-panel{position:absolute;left:16px;right:16px;bottom:84px;z-index:3;border-radius:var(--r-lg);padding:16px 16px 14px;max-height:46vh;overflow-y:auto}.jp-head{display:flex;align-items:center;gap:10px;margin-bottom:8px}.jp-emoji{font-size:26px}.jp-head h3{font-size:20px}.jp-explain{font-size:14.5px;line-height:1.55;color:var(--text);margin:0 0 12px}.jp-meta{display:grid;gap:8px}.jp-row{display:grid;grid-template-columns:auto 1fr;gap:4px}.jp-key{font-size:11.5px;font-weight:800;color:var(--muted);text-transform:uppercase;letter-spacing:.4px}.jp-val{grid-column:1 / -1;font-size:13px;line-height:1.45;color:var(--text)}.journey-nav{position:absolute;left:0;right:0;bottom:max(18px,env(safe-area-inset-bottom));z-index:4;display:flex;align-items:center;justify-content:center;gap:12px}.nav-btn{width:46px;height:46px;border-radius:50%;font-size:22px;font-weight:800;color:var(--text);display:grid;place-items:center}.nav-btn:disabled{opacity:.35}.nav-play{min-width:130px;padding:12px 22px;border-radius:999px;font-weight:800;font-size:15px;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:var(--on-accent);box-shadow:0 8px 24px #6c7bff59}.nav-play:active{transform:translateY(1px)}@media (min-width: 720px){.screen{padding:24px 28px}.card-grid{grid-template-columns:repeat(3,1fr)}.layer-grid{grid-template-columns:repeat(3,1fr);align-content:start}.lesson{max-width:560px;margin-left:auto;margin-right:auto}.chip-rail{justify-content:center;left:0}.intro-card{max-width:460px}}