.tutorial-root{--tutorial-bg:#fff;--tutorial-bg-soft:#f7f8fa;--tutorial-bg-hover:#eef1f6;--tutorial-border:#e3e7ee;--tutorial-border-strong:#c8ced8;--tutorial-text:#1a1a1a;--tutorial-text-muted:#5a6370;--tutorial-text-faint:#8a93a0;--tutorial-link:#06c;--tutorial-link-hover:#0052a3;--tutorial-accent:#06c;--tutorial-accent-soft:#e6f0fb;--tutorial-success:#0a8c3e;--tutorial-warn:#b8860b;--cube-U:#fff;--cube-D:#ffd500;--cube-F:#ef3b2c;--cube-B:#ff5800;--cube-L:#009b48;--cube-R:#0046ad;--font-ui:system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;--font-mono:"JetBrains Mono", "Cascadia Mono", Consolas, "Courier New", monospace;font-family:var(--font-ui);color:var(--tutorial-text);background:var(--tutorial-bg);min-height:100vh}.tutorial-root a{color:var(--tutorial-link);text-decoration:none}.tutorial-root a:hover{color:var(--tutorial-link-hover);text-underline-offset:2px;text-decoration:underline}.tutorial-root 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var(--tutorial-border);flex-wrap:wrap;gap:6px;margin-bottom:20px;padding:16px 0 12px;display:flex}.algset-group-chip{border:1px solid var(--tutorial-border);background:var(--tutorial-bg);color:var(--tutorial-text-muted);border-radius:6px;padding:5px 12px;font-size:13px;transition:all .15s}.algset-group-chip:hover{border-color:var(--tutorial-accent);color:var(--tutorial-accent)}.algset-group-chip.is-active{background:var(--tutorial-accent);border-color:var(--tutorial-accent);color:#fff}.algset-case-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:14px;display:grid}.case-card{background:var(--tutorial-bg);border:1px solid var(--tutorial-border);cursor:pointer;text-align:center;border-radius:8px;flex-direction:column;gap:8px;padding:12px;transition:all .15s;display:flex}.case-card:hover{border-color:var(--tutorial-accent);transform:translateY(-1px);box-shadow:0 4px 12px 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