:root{--cream:#fff8ec;--cream-2:#ffefd6;--coffee:#4a3626;--rice:#ffb84d;--rice-deep:#e8952a;--rice-shadow:#c97c14;--sky:#5fb8e8;--sky-deep:#3d97c9;--sky-shadow:#2678a8;--mint:#4fbf8b;--mint-deep:#35a373;--mint-shadow:#1f8a5c;--coral:#ff6b6b;--coral-deep:#e64f4f;--coral-shadow:#c73a3a;--bg:var(--cream);--bg-raised:var(--cream-2);--bg-sunken:#f5e6c8;--text:var(--coffee);--text-muted:#8a6f57;--border:#e6d3b0;--font-display:"Fredoka", "Noto Sans TC", sans-serif;--font-body:"Nunito", "Noto Sans TC", sans-serif;--font-mono:"JetBrains Mono", monospace}@media (prefers-color-scheme:dark){:root{--bg:#2b2018;--bg-raised:#3a2c20;--bg-sunken:#241a13;--text:#fbead4;--text-muted:#b39a80;--border:#4a3a2a}}:root[data-theme=light]{--bg:var(--cream);--bg-raised:var(--cream-2);--bg-sunken:#f5e6c8;--text:var(--coffee);--text-muted:#8a6f57;--border:#e6d3b0}:root[data-theme=dark]{--bg:#2b2018;--bg-raised:#3a2c20;--bg-sunken:#241a13;--text:#fbead4;--text-muted:#b39a80;--border:#4a3a2a}*{box-sizing:border-box}html{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark}@media (prefers-color-scheme:dark){html{--lightningcss-light: ;--lightningcss-dark:initial}}body{background:var(--bg);min-height:100svh;color:var(--text);font-family:var(--font-body);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;margin:0;font-size:16px;line-height:1.5}h1,h2,h3{font-family:var(--font-display);color:var(--text);margin:0 0 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2.5rem;display:flex;overflow-y:auto}.map-branch-section{padding:0 0 .5rem}.map-branch-section+.map-branch-section{border-top:2px dashed var(--border);margin-top:.5rem;padding-top:1rem}.map-branch-heading{font-family:var(--font-display);color:var(--text-muted);text-align:center;margin:0 0 .25rem;font-size:1.05rem;font-weight:600}.lesson-page{flex-direction:column;flex:1;min-height:0;display:flex}.lesson-topbar{box-sizing:border-box;align-items:center;gap:.9rem;width:100%;max-width:36rem;margin:0 auto;padding:.9rem 1.2rem;display:flex}.lesson-close-btn{width:36px;height:36px;color:var(--text-muted);cursor:pointer;background:0 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