:root{--bg:#f7f3ec;--surface:#fffdf9;--surface-2:#f1eadf;--ink:#2b2522;--muted:#6c5f55;--line:#e4dacb;--accent:#d9482b;--accent-ink:#fff;--accent-soft:#fbe3da;--teal:#1d6b73;--teal-soft:#dcefee;--valley:#1f6fb2;--mountain:#c2410c;--stage:#ece4d6;--focus:#1f6fb2;--radius:14px;--shadow:0 1px 2px #3c28140f, 0 6px 18px #3c281412;--font:system-ui, -apple-system, "Segoe UI", "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Noto Sans JP", sans-serif;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#1b1815;--surface:#24201c;--surface-2:#2d2823;--ink:#f3ece2;--muted:#b8aa9a;--line:#3b342d;--accent:#ff7652;--accent-ink:#1b1815;--accent-soft:#4a2a20;--teal:#7cc6cc;--teal-soft:#1f3638;--valley:#6fb3ef;--mountain:#ff9a66;--stage:#2a2521;--focus:#8cc4ff;--shadow:0 1px 2px #0000004d, 0 6px 18px #00000040;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}}:root[data-theme=dark]{--bg:#1b1815;--surface:#24201c;--surface-2:#2d2823;--ink:#f3ece2;--muted:#b8aa9a;--line:#3b342d;--accent:#ff7652;--accent-ink:#1b1815;--accent-soft:#4a2a20;--teal:#7cc6cc;--teal-soft:#1f3638;--stage:#2a2521;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}[hidden]{display:none!important}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--ink);font-family:var(--font);word-break:keep-all;overflow-wrap:anywhere;margin:0;font-size:16px;line-height:1.6}a{color:var(--teal)}img,svg{max-width:100%}:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:6px}.sr-only{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.wrap{max-width:1120px;margin:0 auto;padding:0 16px}.site-head{z-index:20;background:color-mix(in srgb, var(--bg) 88%, transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);position:sticky;top:0}.site-head .wrap{align-items:center;gap:12px;min-height:56px;display:flex}.brand{color:var(--ink);letter-spacing:-.01em;align-items:center;gap:8px;font-size:18px;font-weight:800;text-decoration:none;display:flex}.brand svg{width:28px;height:28px}.nav{align-items:center;gap:4px;margin-left:auto;display:flex}.nav a,.nav button{color:var(--ink);font:inherit;cursor:pointer;background:0 0;border:0;border-radius:10px;align-items:center;min-height:44px;padding:8px 10px;font-size:15px;text-decoration:none;display:inline-flex}.nav a:hover,.nav button:hover{background:var(--surface-2)}.nav .hide-sm{display:none}@media (min-width:640px){.nav .hide-sm{display:inline-flex}}.lang-switch{position:relative}.lang-switch summary{cursor:pointer;border-radius:10px;align-items:center;gap:4px;min-height:44px;padding:8px 10px;list-style:none;display:flex}.lang-switch summary::-webkit-details-marker{display:none}.lang-switch[open] summary,.lang-switch summary:hover{background:var(--surface-2)}.lang-switch ul{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:12px;min-width:132px;margin:4px 0 0;padding:6px;list-style:none;position:absolute;top:100%;right:0}.lang-switch li a{color:var(--ink);border-radius:8px;padding:10px 12px;text-decoration:none;display:block}.lang-switch li a[aria-current]{background:var(--accent-soft);font-weight:700}.site-foot{border-top:1px solid var(--line);color:var(--muted);margin-top:48px;padding:24px 0 40px;font-size:14px}.site-foot .wrap{flex-wrap:wrap;align-items:center;gap:8px 20px;display:flex}.site-foot a{color:var(--muted)}.btn{border-radius:var(--radius);border:1px solid var(--line);background:var(--surface);min-height:48px;color:var(--ink);font:inherit;cursor:pointer;-webkit-tap-highlight-color:transparent;justify-content:center;align-items:center;gap:8px;padding:10px 18px;font-weight:650;text-decoration:none;transition:transform 80ms,background .15s;display:inline-flex}.btn:hover{background:var(--surface-2)}.btn:active{transform:translateY(1px)}.btn[disabled]{opacity:.4;cursor:not-allowed}.btn-primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}.btn-primary:hover{background:color-mix(in srgb, var(--accent) 88%, #000)}.btn svg{flex:none;width:22px;height:22px}.btn-ghost{background:0 0}.hero{padding:28px 0 8px}.hero .wrap{align-items:center;gap:20px;display:grid}@media (min-width:860px){.hero .wrap{grid-template-columns:1.1fr .9fr;gap:40px;padding-top:24px}}.hero h1{letter-spacing:-.02em;margin:0 0 12px;font-size:clamp(28px,6vw,46px);line-height:1.2}.hero p.lead{color:var(--muted);margin:0 0 22px;font-size:clamp(16px,2.4vw,19px)}.hero-actions{flex-wrap:wrap;gap:10px;display:flex}.hero-art{background:radial-gradient(circle at 50% 45%, var(--surface) 0, var(--surface-2) 70%);aspect-ratio:1/.86;border:1px solid var(--line);border-radius:24px;place-items:center;display:grid;overflow:hidden}.hero-art svg{width:82%;height:auto}.points{gap:12px;margin:32px 0 8px;display:grid}@media (min-width:720px){.points{grid-template-columns:repeat(3,1fr)}}.point{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px}.point h3{margin:0 0 4px;font-size:17px}.point p{color:var(--muted);margin:0;font-size:15px}.section-title{letter-spacing:-.01em;margin:36px 0 14px;font-size:22px}.cat-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;display:grid}.cat-tile{border-radius:var(--radius);background:var(--surface);border:1px solid var(--line);min-height:56px;color:var(--ink);justify-content:space-between;align-items:center;padding:14px 16px;font-weight:650;text-decoration:none;display:flex}.cat-tile span{color:var(--muted);font-size:14px;font-weight:500}.cat-tile:hover{background:var(--surface-2)}.cards{grid-template-columns:repeat(auto-fill,minmax(158px,1fr));gap:12px;display:grid}@media (min-width:720px){.cards{grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:16px}}.card{background:var(--surface);border:1px solid var(--line);color:var(--ink);box-shadow:var(--shadow);border-radius:16px;flex-direction:column;text-decoration:none;transition:transform .12s;display:flex;overflow:hidden}.card:hover{transform:translateY(-2px)}.card[hidden]{display:none}.card-pic{aspect-ratio:1;background:radial-gradient(circle at 50% 45%, var(--surface) 0, var(--surface-2) 78%);place-items:center;display:grid}.card-pic svg,.card-pic img{width:86%;height:86%}.card-body{gap:4px;padding:10px 12px 12px;display:grid}.card-title{margin:0;font-size:17px;font-weight:750}.card-meta{color:var(--muted);flex-wrap:wrap;align-items:center;gap:6px;font-size:13px;display:flex}.badge{background:var(--surface-2);color:var(--ink);border-radius:999px;align-items:center;gap:4px;padding:2px 8px;font-size:12.5px;font-weight:650;display:inline-flex}.badge.d1{background:var(--teal-soft);color:var(--teal)}.badge.d2{background:var(--accent-soft);color:var(--accent)}.badge.d3{color:#5b3d99;background:#e9e1f6}@media (prefers-color-scheme:dark){.badge.d3{color:#c8b5ff;background:#33294a}}.dots{letter-spacing:1px}.badge.preview{color:#7a5b00;background:#fff3c4}@media (prefers-color-scheme:dark){.badge.preview{color:#f2d36b;background:#3d3417}}.catalog h1{margin:24px 0 12px;font-size:28px}.filters{gap:10px;margin-bottom:16px;display:grid}.filter-row{scrollbar-width:thin;gap:6px;padding-bottom:4px;display:flex;overflow-x:auto}.pill{border:1px solid var(--line);background:var(--surface);min-height:44px;color:var(--ink);font:inherit;cursor:pointer;border-radius:999px;flex:none;padding:8px 14px;font-size:15px}.pill[aria-pressed=true]{background:var(--ink);color:var(--bg);border-color:var(--ink)}.cat-search{border-radius:var(--radius);border:1px solid var(--line);background:var(--surface);width:100%;min-height:48px;color:var(--ink);font:inherit;padding:10px 14px}.cat-empty{color:var(--muted);padding:24px 0}.intro{gap:20px;padding-top:20px;display:grid}@media (min-width:860px){.intro{grid-template-columns:.9fr 1.1fr;align-items:start;gap:36px}}.intro-pic{background:radial-gradient(circle at 50% 45%, var(--surface) 0, var(--surface-2) 75%);border:1px solid var(--line);aspect-ratio:1;border-radius:24px;place-items:center;display:grid}.intro-pic svg{width:84%;height:84%}.intro h1{letter-spacing:-.02em;margin:0 0 6px;font-size:clamp(28px,5vw,40px)}.facts{grid-template-columns:repeat(2,1fr);gap:8px;margin:16px 0;padding:0;list-style:none;display:grid}.facts li{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:10px 12px}.facts b{color:var(--muted);font-size:13px;font-weight:600;display:block}.note{background:var(--surface-2);color:var(--muted);border-radius:12px;padding:10px 14px;font-size:14.5px}.step-list{gap:8px;margin:0;padding:0;list-style:none;display:grid}.step-list li{background:var(--surface);border:1px solid var(--line);border-radius:12px;grid-template-columns:64px 1fr;align-items:center;gap:12px;padding:8px 12px 8px 8px;display:grid}.step-list .pic{background:var(--surface-2);border-radius:10px;place-items:center;width:64px;height:64px;display:grid}.step-list .pic img,.step-list .pic svg{width:60px;height:60px}.step-list h3{margin:0;font-size:15.5px}.step-list p{color:var(--muted);margin:2px 0 0;font-size:14.5px}.step-list a{color:inherit;text-decoration:none}.fold{grid-template-columns:1fr;grid-template-areas:"top""stage""controls""status""strip""side";gap:10px;max-width:1280px;margin:0 auto;padding:8px 16px 32px;display:grid}@media (min-width:980px){.fold{grid-template-columns:minmax(0,1fr) 360px;grid-template-areas:"top top""stage side""controls side""status side""strip strip";column-gap:20px}}.fold-top{grid-area:top;align-items:center;gap:10px;display:flex}.fold-top h1{white-space:nowrap;text-overflow:ellipsis;flex:1;min-width:0;margin:0;font-size:20px;overflow:hidden}.back-link{min-height:44px;color:var(--ink);border-radius:10px;align-items:center;gap:4px;padding:0 10px 0 4px;text-decoration:none;display:inline-flex}.back-link:hover{background:var(--surface-2)}.stage{background:var(--stage);border:1px solid var(--line);touch-action:none;border-radius:20px;grid-area:stage;height:clamp(280px,54svh,680px);position:relative;overflow:hidden}@media (min-width:980px){.stage{height:min(66vh,700px)}}.stage canvas{width:100%;height:100%;display:block}.stage-tools{gap:6px;display:flex;position:absolute;top:8px;right:8px}.tool{border:1px solid var(--line);background:color-mix(in srgb, var(--surface) 90%, transparent);min-width:44px;min-height:44px;color:var(--ink);cursor:pointer;font:inherit;border-radius:12px;justify-content:center;align-items:center;gap:6px;padding:0 10px;font-size:14px;display:inline-flex}.tool svg{width:20px;height:20px}.tool .lbl{display:none}@media (min-width:640px){.tool .lbl{display:inline}}.tool[aria-pressed=true]{background:var(--ink);color:var(--bg)}.stage-help{color:var(--muted);pointer-events:none;font-size:12.5px;position:absolute;bottom:8px;left:10px;right:10px}.legend{color:var(--muted);pointer-events:none;background:color-mix(in srgb, var(--surface) 78%, transparent);border-radius:8px;gap:2px;padding:4px 8px;font-size:12.5px;display:grid;position:absolute;top:10px;left:10px}.legend .v{color:var(--valley)}.legend .m{color:var(--mountain)}@media (max-width:520px){.legend{display:none}}.stage-fallback{text-align:center;color:var(--muted);place-items:center;padding:24px;display:grid;position:absolute;top:0;bottom:0;left:0;right:0}.fold-loading{color:var(--muted);place-items:center;display:grid;position:absolute;top:0;bottom:0;left:0;right:0}.controls{grid-area:controls;grid-template-columns:1fr 1.2fr 1fr;gap:8px;display:grid}.controls .btn{min-height:56px;font-size:17px}.btn-play .i-pause{display:none}.btn-play.is-playing .i-pause{display:block}.btn-play.is-playing .i-play{display:none}.status{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);flex-wrap:wrap;grid-area:status;align-items:center;gap:8px 12px;padding:8px 12px;display:flex}.step-counter{font-variant-numeric:tabular-nums;min-width:92px;font-weight:750}.scrub{min-width:120px;accent-color:var(--accent);flex:140px;height:32px}.status label{color:var(--muted);align-items:center;gap:6px;min-height:40px;font-size:14px;display:inline-flex}.status select{border:1px solid var(--line);background:var(--surface);min-height:40px;color:var(--ink);font:inherit;border-radius:10px;padding:0 8px}.status input[type=checkbox]{width:20px;height:20px;accent-color:var(--accent)}.strip{grid-area:strip;grid-template-columns:44px 1fr 44px;align-items:center;gap:6px;min-width:0;display:grid}.strip-list{scroll-snap-type:x proximity;scrollbar-width:thin;gap:8px;min-width:0;margin:0;padding:4px 2px 8px;list-style:none;display:flex;overflow-x:auto}.chip{scroll-snap-align:center;border:2px solid var(--line);background:var(--surface);width:84px;color:var(--ink);font:inherit;cursor:pointer;border-radius:12px;flex:none;grid-template-rows:64px auto;justify-items:center;gap:2px;padding:6px 4px;display:grid;position:relative}.chip-pic{place-items:center;width:64px;height:64px;display:grid}.chip-pic svg{width:64px;height:64px}.chip-num{font-variant-numeric:tabular-nums;font-size:13px;font-weight:800;position:absolute;top:4px;left:6px}.chip-label{-webkit-line-clamp:2;text-align:center;max-width:76px;color:var(--muted);-webkit-box-orient:vertical;font-size:11.5px;line-height:1.25;display:-webkit-box;overflow:hidden}.chip.is-done{border-color:color-mix(in srgb, var(--teal) 40%, var(--line))}.chip.is-current{border-color:var(--accent);background:var(--accent-soft)}.chip.is-current .chip-label{color:var(--ink);font-weight:700}.strip .tool{background:var(--surface)}.side{grid-area:side;align-content:start;gap:10px;display:grid}.instr{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px}.instr-kind{color:var(--teal);background:var(--teal-soft);border-radius:999px;margin-bottom:6px;padding:2px 10px;font-size:13px;font-weight:650;display:inline-block}.instr-title{margin:0 0 4px;font-size:19px;line-height:1.35}.instr-text{margin:0;font-size:16.5px}.instr-tip{color:var(--muted);background:var(--surface-2);border-radius:10px;margin:10px 0 0;padding:8px 10px;font-size:14.5px}.instr-actions{flex-wrap:wrap;gap:8px;margin-top:12px;display:flex}.instr-actions .btn{min-height:44px;padding:6px 12px;font-size:14.5px;font-weight:600}.done{background:linear-gradient(160deg, var(--accent-soft), var(--surface));border:1px solid var(--line);border-radius:var(--radius);padding:16px}.done h2{margin:0 0 4px;font-size:24px}.done ul{margin:8px 0;padding-left:20px}.done .related{flex-wrap:wrap;gap:8px;margin-top:8px;display:flex}.done .related a{background:var(--surface);border:1px solid var(--line);color:var(--ink);border-radius:12px;align-items:center;gap:6px;min-height:44px;padding:4px 10px 4px 4px;text-decoration:none;display:inline-flex}.done .related img,.done .related svg{width:36px;height:36px}.resume{background:var(--teal-soft);border-radius:var(--radius);justify-content:space-between;align-items:center;gap:8px;padding:10px 12px;display:flex}.toast{background:var(--ink);color:var(--bg);z-index:50;border-radius:12px;padding:10px 16px;position:fixed;bottom:24px;left:50%;transform:translate(-50%)}.fallback-steps{margin-top:8px}.no-webgl .stage{height:auto;min-height:120px}.no-webgl .stage canvas,.no-webgl .stage-tools,.no-webgl .stage-help,.no-webgl .legend{display:none}.no-webgl .stage-fallback{position:static}dialog{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:18px;width:min(420px,100vw - 32px);padding:20px}dialog::backdrop{background:#140f0a66}dialog h2{margin:0 0 12px;font-size:20px}.set-row{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:12px;min-height:52px;display:flex}.set-row select,.set-row input[type=checkbox]{min-height:40px;font:inherit}.set-row input[type=checkbox]{width:22px;height:22px;accent-color:var(--accent)}.prose{max-width:760px}.prose h1{font-size:30px}.basics-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px;display:grid}.basic{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px}.basic h3{margin:8px 0 4px}.basic p{color:var(--muted);margin:0;font-size:15px}.basic svg{width:100%;height:120px}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}.hide-xs{display:none}@media (min-width:520px){.hide-xs{display:inline}}.brand span,.nav a,.nav button,.lang-switch summary{white-space:nowrap}@media (max-width:440px){.site-head .wrap{gap:6px}.brand{font-size:16px}.nav a{padding:8px 6px}.lang-switch summary span{display:none}.fold{padding:6px 12px 28px}}