:root{--accent:#7e14ff;--accent-2:#b45cff;--grad:linear-gradient(135deg, #7e14ff 0%, #b45cff 100%);--bg:#faf9fc;--card:#fff;--text:#55496b;--text-h:#1a1226;--text-dim:#8d84a0;--border:#e9e4f2;--code-bg:#f4f0fa;--accent-bg:#7e14ff12;--accent-border:#7e14ff59;--ok:#157f3d;--ok-bg:#15a84c1a;--err:#c02942;--err-bg:#dc385417;--warn:#9a5b00;--warn-bg:#f59e0b21;--warn-border:#f59e0b73;--console-bg:#1c1428;--console-text:#e8e3f2;--console-border:#382a4d;--shadow:0 1px 2px #1a12260d, 0 6px 20px -8px #7e14ff1f;--shadow-lift:0 2px 4px #1a12260f, 0 12px 28px -10px #7e14ff40;--radius:14px;--sans:system-ui, "Segoe UI", Roboto, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;--mono:ui-monospace, "Cascadia Code", Consolas, monospace;font:16px/1.65 var(--sans);--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial;--bg:#141020;--card:#1d1730;--text:#b3a9c9;--text-h:#f2eefa;--text-dim:#7d7194;--border:#2e2545;--code-bg:#251d3b;--accent:#b45cff;--accent-bg:#b45cff1f;--accent-border:#b45cff73;--ok:#4ade80;--ok-bg:#4ade801f;--err:#ff7a90;--err-bg:#ff7a901f;--shadow:0 1px 2px #0000004d, 0 6px 20px -8px #00000080;--shadow-lift:0 2px 4px #00000059, 0 12px 28px -10px #7e14ff66}}*{box-sizing:border-box}body{background:var(--bg);margin:0}h1,h2,h3{color:var(--text-h);margin:0;line-height:1.25}p{margin:0}a{color:var(--accent);text-decoration:none}code{font-family:var(--mono);background:var(--code-bg);color:var(--text-h);border-radius:6px;padding:2px 6px;font-size:.88em}.app{flex-direction:column;min-height:100svh;display:flex}.site-header{z-index:10;background:var(--bg);background:color-mix(in srgb, var(--bg) 82%, transparent);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:10px 20px;display:flex;position:sticky;top:0}.brand{color:var(--text-h);letter-spacing:-.2px;align-items:center;gap:9px;font-size:17px;font-weight:700;display:inline-flex}.brand-mark{background:var(--grad);color:#fff;letter-spacing:0;border-radius:8px;place-items:center;width:28px;height:28px;font-size:12.5px;font-weight:800;display:inline-grid}.site-nav a{color:var(--text);border-radius:9px;padding:7px 12px;font-size:14px;font-weight:600;transition:background .2s,color .2s}.site-nav a:hover{background:var(--accent-bg);color:var(--accent)}.container{flex:1;width:100%;max-width:720px;margin:0 auto;padding:28px 20px 56px}.site-footer{border-top:1px solid var(--border);text-align:center;color:var(--text-dim);padding:20px;font-size:13px}.hero{text-align:center;padding:28px 0 36px}.hero-mark{background:var(--grad);color:#fff;width:64px;height:64px;box-shadow:var(--shadow-lift);border-radius:18px;place-items:center;margin-bottom:18px;font-size:26px;font-weight:800;display:inline-grid}.hero h1{letter-spacing:-.8px;background:var(--grad);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:34px;font-weight:800}.hero-sub{color:var(--text-dim);margin-top:10px;font-size:15.5px}.tier-section+.tier-section{margin-top:22px}.tier-heading{color:var(--text-dim);text-transform:uppercase;letter-spacing:.4px;margin-bottom:10px;font-size:13px;font-weight:700}.chapter-cards{grid-template-columns:1fr;gap:12px;margin:0;padding:0;list-style:none;display:grid}.chapter-cards li:first-child{grid-column:1/-1}@media (width>=480px){.chapter-cards{grid-template-columns:repeat(2,1fr)}.chapter-cards li:first-child{grid-column:1/-1}}.chapter-card{background:color-mix(in srgb, var(--chapter-color) 8%, var(--card));border:1px solid color-mix(in srgb, var(--chapter-color) 22%, var(--border));border-radius:var(--radius);height:100%;box-shadow:var(--shadow);color:var(--text-h);align-items:center;gap:14px;padding:16px;font-size:15.5px;font-weight:600;transition:transform .15s,box-shadow .2s,border-color .2s;display:flex}.chapter-card:hover{box-shadow:var(--shadow-lift);border-color:var(--chapter-color);transform:translateY(-2px)}.chapter-icon{background:color-mix(in srgb, var(--chapter-color) 16%, transparent);width:40px;height:40px;color:var(--chapter-color);border-radius:11px;flex:none;place-items:center;display:grid}.chapter-card-body{flex-direction:column;gap:3px;min-width:0;display:flex}.chapter-num{color:var(--chapter-color);font-size:12px;font-weight:700}.chapter-eyebrow{letter-spacing:.3px;color:var(--chapter-color);font-size:12px;font-weight:700}.chapter-title{color:var(--text-h);font-size:15.5px;font-weight:700;line-height:1.3}.chapter-arrow{color:var(--text-dim);margin-left:auto;transition:transform .15s,color .15s}.chapter-card:hover .chapter-arrow{color:var(--chapter-color);transform:translate(3px)}.chapter-card--featured{padding:22px 20px}.chapter-card--featured .chapter-icon{width:52px;height:52px}.chapter-card--featured .chapter-title{font-size:19px}.chapter-status{color:var(--text-dim);white-space:nowrap;flex:none;align-items:center;gap:5px;margin-left:auto;font-size:11.5px;font-weight:700;display:inline-flex}.chapter-status-dot{background:var(--text-dim);border-radius:50%;width:7px;height:7px}.chapter-status--done{color:var(--ok)}.chapter-status--done .chapter-status-dot{background:var(--ok)}.chapter-status--in_progress{color:var(--accent)}.chapter-status--in_progress .chapter-status-dot{background:var(--accent)}.chapter-card--featured .chapter-status{margin-left:0;margin-right:6px}.progress-summary{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);flex-direction:column;gap:12px;margin-bottom:18px;padding:14px 18px;display:flex}.progress-stats{gap:28px;display:flex}.progress-stat{flex-direction:column;flex:none;display:flex}.progress-stat-value{color:var(--text-h);font-size:26px;font-weight:800;line-height:1.2}.progress-stat-label{color:var(--text-dim);font-size:11px;font-weight:600}.progress-chapters{align-items:center;gap:10px;display:flex}.progress-track{background:var(--code-bg);border-radius:99px;flex:1;height:8px;overflow:hidden}.progress-fill{background:var(--grad);border-radius:99px;height:100%;transition:width .4s}.progress-chapters-label{color:var(--text-dim);flex:none;font-size:12px;font-weight:700}.progress-badges{-webkit-overflow-scrolling:touch;scrollbar-width:none;gap:6px;padding-bottom:1px;display:flex;overflow-x:auto}.progress-badges::-webkit-scrollbar{display:none}.badge{border:1px solid var(--border);white-space:nowrap;border-radius:99px;flex:none;padding:4px 9px;font-size:10.5px;font-weight:600}.badge--locked{color:var(--text-dim);background:var(--code-bg)}.badge--unlocked{color:var(--accent);background:var(--accent-bg);border-color:var(--accent-border);font-weight:700}.errors-banner{border-radius:var(--radius);border:1px dashed var(--accent-border);background:var(--accent-bg);color:var(--text-h);align-items:center;gap:14px;margin-top:22px;padding:16px 18px;font-weight:600;transition:border-style .15s,box-shadow .2s;display:flex}.errors-banner:hover{box-shadow:var(--shadow);border-style:solid}.errors-banner .desc{color:var(--text-dim);margin-top:2px;font-size:13.5px;font-weight:400;display:block}.errors-banner-icon{color:var(--accent);flex:none;place-items:center;display:grid}.back-link{color:var(--text-dim);align-items:center;gap:6px;margin-bottom:18px;font-size:14px;font-weight:600;transition:color .15s;display:inline-flex}.back-link:hover{color:var(--accent)}.page-title{letter-spacing:-.5px;margin-bottom:26px;font-size:26px;font-weight:800}.chapter-scope .chapter-order{color:var(--chapter-color)}.chapter-scope .panel h2:before{background:var(--chapter-color)}.chapter-scope .quiz-choice:hover{border-color:color-mix(in srgb, var(--chapter-color) 45%, transparent)}.chapter-scope .quiz-choice input{accent-color:var(--chapter-color)}.chapter-scope .quiz-choice.selected{border-color:var(--chapter-color);background:color-mix(in srgb, var(--chapter-color) 10%, transparent)}.chapter-scope .quiz-choice.correct{border-color:var(--ok);background:var(--ok-bg)}.chapter-scope .quiz-choice.wrong{border-color:var(--err);background:var(--err-bg)}.panel{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:18px;padding:22px 20px}.panel h2{align-items:center;gap:10px;margin-bottom:14px;font-size:17px;font-weight:700;display:flex}.panel h2:before{content:"";background:var(--grad);border-radius:2px;width:4px;height:18px}.panel>p{font-size:15.5px}.explain-section{margin-bottom:18px}.explain-section:last-child{margin-bottom:0}.explain-section h3{color:var(--accent);margin-bottom:6px;font-size:14px;font-weight:700}.explain-section p{font-size:15.5px}.explain-bullets{flex-direction:column;gap:6px;margin:10px 0 0;padding:0;list-style:none;display:flex}.explain-bullets li{color:var(--text);padding-left:16px;font-size:14.5px;position:relative}.explain-bullets li:before{content:"";background:var(--accent);border-radius:50%;width:5px;height:5px;position:absolute;top:8px;left:2px}.explain-code{margin-top:10px;padding:10px 14px;font-size:12.5px}.tok-kw{color:#d8a7ff}.tok-str{color:#9ece8f}.tok-com{color:#8b7fa8}.code-block{font-family:var(--mono);background:var(--console-bg);color:var(--console-text);border:1px solid var(--console-border);border-radius:10px;margin:0;padding:14px 16px;font-size:13.5px;line-height:1.7;overflow-x:auto}.btn{font:inherit;cursor:pointer;border:none;border-radius:11px;justify-content:center;align-items:center;gap:8px;padding:11px 20px;font-size:15px;font-weight:700;transition:transform .12s,box-shadow .2s,opacity .2s;display:inline-flex}.btn:disabled{opacity:.55;cursor:default}.btn-primary{background:var(--grad);color:#fff;box-shadow:0 4px 14px -4px #7e14ff80}.btn-primary:not(:disabled):hover{transform:translateY(-1px);box-shadow:0 6px 18px -4px #7e14ff99}.btn-outline{color:var(--text);border:1px solid var(--border);background:0 0;padding:9px 14px;font-size:13.5px}.btn-outline:not(:disabled):hover{border-color:var(--accent);color:var(--accent)}.btn-block{width:100%;display:flex}.quiz-cta{margin-top:6px}.py-repl{flex-direction:column;gap:10px;display:flex}.code-input{font-family:var(--mono);background:var(--console-bg);width:100%;color:var(--console-text);caret-color:var(--accent-2);border:1px solid var(--console-border);resize:vertical;border-radius:10px;padding:14px 16px;font-size:13.5px;line-height:1.7;transition:border-color .2s}.code-input:focus{border-color:var(--accent);outline:none}.repl-toolbar{justify-content:space-between;align-items:center;gap:12px;display:flex}.repl-actions{gap:8px;display:flex}.repl-status{font-family:var(--mono);color:var(--text-dim);background:var(--code-bg);border-radius:99px;padding:4px 11px;font-size:12px}.console{font-family:var(--mono);background:var(--console-bg);color:var(--console-text);border:1px solid var(--console-border);white-space:pre-wrap;border-radius:10px;min-height:44px;margin:0;padding:12px 16px;font-size:13px;line-height:1.65;overflow-x:auto}.console:empty:before{content:"실행 결과가 여기에 표시됩니다";color:#6c5f85}.feedback{border-radius:10px;align-items:center;gap:8px;padding:10px 14px;font-size:14px;font-weight:600;display:flex}.feedback-pass{color:var(--ok);background:var(--ok-bg)}.feedback-fail{color:var(--err);background:var(--err-bg)}.feedback a{text-underline-offset:3px;font-weight:700;text-decoration:underline}.quiz-q{margin-bottom:18px}.quiz-question{color:var(--text-h);margin-bottom:12px;font-size:15.5px;font-weight:700}.quiz-choices{flex-direction:column;gap:8px;display:flex}.quiz-choice{border:1.5px solid var(--border);cursor:pointer;border-radius:11px;align-items:center;gap:10px;padding:11px 14px;font-size:14.5px;transition:border-color .15s,background .15s;display:flex}.quiz-choice:hover{border-color:var(--accent-border)}.quiz-choice input{accent-color:var(--accent);flex:none;margin:0}.quiz-choice.selected{border-color:var(--accent);background:var(--accent-bg);color:var(--text-h)}.quiz-choice.correct{border-color:var(--ok);background:var(--ok-bg);color:var(--ok);font-weight:600}.quiz-choice.wrong{border-color:var(--err);background:var(--err-bg);color:var(--err)}.quiz-choice.locked{cursor:default}.quiz-explain{background:var(--accent-bg);border:1px solid var(--accent-border);border-radius:12px;margin-top:12px;padding:11px 14px}.quiz-explain-label{color:var(--accent);letter-spacing:.02em;margin-bottom:4px;font-size:12px;font-weight:800;display:inline-block}.quiz-explain p{margin:0;font-size:14.5px}.quiz-score{text-align:center;color:var(--text-h);background:var(--accent-bg);border:1px solid var(--accent-border);border-radius:var(--radius);margin-top:18px;padding:14px;font-size:17px;font-weight:800}.quiz-congrats{text-align:center;color:var(--ok);background:var(--ok-bg);border-radius:var(--radius);margin-top:10px;padding:12px;font-size:15px;font-weight:700}.quiz-next{margin-top:12px}.error-nav{flex-wrap:wrap;gap:8px;margin:-10px 0 22px;display:flex}.error-nav-pill{font:inherit;font-family:var(--mono);color:var(--text);background:var(--card);border:1px solid var(--border);cursor:pointer;border-radius:99px;padding:6px 13px;font-size:12.5px;font-weight:600;transition:border-color .15s,color .15s}.error-nav-pill:hover{border-color:var(--err);color:var(--err)}.error-entry{scroll-margin-top:76px}.error-entry h2:before{background:var(--err)}.error-entry h2{font-family:var(--mono);letter-spacing:-.3px}.not-found{text-align:center;padding:64px 0}.not-found p{margin-bottom:16px;font-size:17px}.chapter-meta{color:var(--text-dim);margin-bottom:4px;font-size:13px;font-weight:600}.chapter-tagline{color:var(--text-dim);font-weight:500}.stage-num{color:#fff;background:var(--chapter-color,var(--accent));border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:24px;height:24px;font-size:13px;font-weight:800;display:inline-flex}.chapter-scope .panel h2:has(.stage-num):before{display:none}.trip{background:var(--warn-bg);border:1px solid var(--warn-border);border-radius:12px;margin-top:18px;padding:12px 14px}.trip-label{color:var(--warn);letter-spacing:.02em;margin-bottom:4px;font-size:12px;font-weight:800;display:inline-block}.trip p{margin:0;font-size:14.5px}.vibe-prompt{border:1px dashed var(--accent-border);background:var(--accent-bg);border-radius:12px;margin-bottom:14px;padding:12px 14px}.vibe-prompt-head{justify-content:space-between;align-items:center;gap:8px;margin-bottom:6px;display:flex}.vibe-prompt-label{color:var(--accent);font-size:12px;font-weight:800}.btn-sm{border-radius:8px;padding:5px 10px;font-size:12.5px}.vibe-prompt-text{color:var(--text-h);margin:0 0 6px;font-size:15px}.vibe-prompt-note{color:var(--text-dim);margin:0;font-size:12.5px}.vibe-sample-label{color:var(--text-h);align-items:center;gap:8px;margin:0 0 8px;font-size:14px;font-weight:700;display:flex}.vibe-sample-note{color:var(--text-dim);margin:4px 0 10px;font-size:12px;line-height:1.5}.site-footer-note{margin-top:6px;font-size:12px;line-height:1.5;display:block}.vibe-sample-tag{color:var(--text-dim);border:1px solid var(--border);border-radius:999px;padding:1px 8px;font-size:11px;font-weight:700}.vibe-checks{gap:8px;margin:16px 0 0;padding-left:22px;font-size:14.5px;display:grid}.vibe-checks li::marker{color:var(--chapter-color,var(--accent));font-weight:800}.vibe-checks strong{color:var(--text-h)}.project-hint{color:var(--text-dim);margin:0 0 10px;font-size:13.5px}.project-sample{margin-top:12px}.project-sample summary{cursor:pointer;color:var(--text);font-size:13.5px;font-weight:700}.project-sample-out{margin-top:8px}.concept-notice p{color:var(--text-dim);margin-top:10px;font-size:14px}.chapter-outro{color:var(--text-h);text-align:center;margin:4px 0 14px;font-size:15px;font-weight:600}.quiz-predict-code{margin:0 0 12px}