@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap";:root{--bg-primary:#fbfbfa;--bg-secondary:#f4f4f2;--bg-card:#fff;--bg-card-hover:#fafafa;--bg-sidebar:#f7f7f5;--border-subtle:#e9e9e6;--border-strong:#deded9;--text-primary:#1c1d21;--text-secondary:#585a63;--text-muted:#8b8d97;--text-inverse:#fff;--accent-primary:#3b82f6;--accent-primary-hover:#2563eb;--accent-subtle:#eff6ff;--accent-border:#bfdbfe;--status-completed:#10b981;--status-completed-bg:#ecfdf5;--status-completed-border:#a7f3d0;--status-review:#f59e0b;--status-review-bg:#fffbeb;--status-review-border:#fde68a;--status-danger:#ef4444;--status-danger-bg:#fef2f2;--status-danger-border:#fecaca;--code-bg:#1e1e24;--code-text:#e2e8f0;--code-inline-bg:#f1f2f4;--code-inline-text:#0f172a;--sidebar-width:290px;--content-max-width:860px;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--shadow-sm:0 1px 3px #0000000a;--shadow-md:0 6px 16px #0000000d;--shadow-lg:0 14px 32px #00000014;--transition-fast:.18s cubic-bezier(.16, 1, .3, 1);--transition-smooth:.28s cubic-bezier(.16, 1, .3, 1)}[data-theme=dark]{--bg-primary:#0d0f12;--bg-secondary:#14171d;--bg-card:#181b22;--bg-card-hover:#1f232c;--bg-sidebar:#111318;--border-subtle:#232732;--border-strong:#2f3442;--text-primary:#f3f4f6;--text-secondary:#9ea4b3;--text-muted:#646b7a;--text-inverse:#0d0f12;--accent-primary:#60a5fa;--accent-primary-hover:#3b82f6;--accent-subtle:#172554;--accent-border:#1d4ed8;--status-completed:#34d399;--status-completed-bg:#064e3b;--status-completed-border:#047857;--status-review:#fbbf24;--status-review-bg:#78350f;--status-review-border:#b45309;--code-bg:#111317;--code-text:#e2e8f0;--code-inline-bg:#1f232c;--code-inline-text:#93c5fd;--shadow-sm:0 1px 3px #0006;--shadow-md:0 6px 16px #00000080;--shadow-lg:0 14px 32px #0009}*{box-sizing:border-box;-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;margin:0;padding:0}html{scroll-behavior:smooth}body{background-color:var(--bg-primary);color:var(--text-primary);transition:background-color var(--transition-smooth), color var(--transition-smooth);font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.68;overflow-x:hidden}code,pre,kbd{font-family:JetBrains Mono,Fira Code,monospace}.app-container{min-height:100vh;display:flex}.sidebar{width:var(--sidebar-width);background-color:var(--bg-sidebar);border-right:1px solid var(--border-subtle);z-index:100;-webkit-user-select:none;user-select:none;transition:transform var(--transition-smooth);flex-direction:column;display:flex;position:fixed;top:0;bottom:0;left:0;overflow-y:auto}.sidebar-header{border-bottom:1px solid var(--border-subtle);justify-content:space-between;align-items:center;padding:20px 20px 16px;display:flex}.sidebar-brand{color:var(--text-primary);align-items:center;gap:10px;text-decoration:none;display:flex}.sidebar-logo-icon{color:#fff;letter-spacing:-.5px;background:linear-gradient(135deg,#3b82f6 0%,#1d4ed8 100%);border-radius:9px;justify-content:center;align-items:center;width:34px;height:34px;font-size:15px;font-weight:800;display:flex;box-shadow:0 4px 10px #3b82f640}.sidebar-brand-text{flex-direction:column;display:flex}.sidebar-brand-title{letter-spacing:-.3px;font-size:16.5px;font-weight:700;line-height:1.2}.sidebar-brand-sub{color:var(--text-muted);font-size:11px;font-weight:500}.sidebar-nav{flex-direction:column;gap:3px;padding:14px 12px;display:flex}.nav-item{border-radius:var(--radius-md);color:var(--text-secondary);transition:all var(--transition-fast);cursor:pointer;text-align:left;background:0 0;border:1px solid #0000;justify-content:space-between;align-items:center;width:100%;padding:9px 12px;font-size:14px;font-weight:500;text-decoration:none;display:flex}.nav-item:hover{background-color:var(--bg-card);color:var(--text-primary);border-color:var(--border-subtle)}.nav-item.active{background-color:var(--bg-card);color:var(--accent-primary);box-shadow:var(--shadow-sm);border-color:var(--border-subtle);font-weight:600}.nav-item-left{align-items:center;gap:10px;display:flex}.nav-badge{background-color:var(--border-subtle);color:var(--text-muted);border-radius:10px;padding:2px 7px;font-size:11px;font-weight:600}.nav-badge.review-badge{background-color:var(--status-review-bg);color:var(--status-review);border:1px solid var(--status-review-border)}.sidebar-section-title{text-transform:uppercase;letter-spacing:.8px;color:var(--text-muted);padding:16px 14px 6px;font-size:11px;font-weight:700}.sidebar-modules-list{flex-direction:column;gap:4px;padding:0 10px 20px;display:flex}.module-item-btn{border-radius:var(--radius-sm);width:100%;color:var(--text-secondary);text-align:left;cursor:pointer;transition:all var(--transition-fast);background:0 0;border:none;justify-content:space-between;align-items:center;padding:7px 10px;font-size:13px;display:flex}.module-item-btn:hover{background-color:var(--bg-card);color:var(--text-primary)}.module-item-btn.active{background-color:var(--bg-card);color:var(--accent-primary);box-shadow:var(--shadow-sm);font-weight:600}.main-wrapper{margin-left:var(--sidebar-width);flex-direction:column;flex:1;min-height:100vh;display:flex}.topbar{border-bottom:1px solid var(--border-subtle);background-color:var(--bg-primary);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);z-index:50;height:58px;transition:background-color var(--transition-smooth), border-color var(--transition-smooth);justify-content:space-between;align-items:center;padding:0 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var(--transition-fast);padding:24px}.card:hover{border-color:var(--border-strong)}h1{letter-spacing:-.6px;color:var(--text-primary);margin-bottom:12px;font-size:29px;font-weight:750;line-height:1.25}h2{letter-spacing:-.4px;color:var(--text-primary);margin-top:28px;margin-bottom:10px;font-size:20px;font-weight:650;line-height:1.35}h3{letter-spacing:-.2px;color:var(--text-primary);margin-top:20px;margin-bottom:8px;font-size:16.5px;font-weight:600}p{color:var(--text-secondary);margin-bottom:14px;font-size:15px;line-height:1.72}.code-block{background-color:var(--code-bg);border-radius:var(--radius-md);border:1px solid var(--border-subtle);box-shadow:var(--shadow-sm);margin:18px 0;overflow:hidden}.code-header{background-color:#ffffff09;border-bottom:1px solid #ffffff12;justify-content:space-between;align-items:center;padding:8px 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var(--transition-fast);-webkit-user-select:none;user-select:none;border:1px solid #0000;justify-content:center;align-items:center;gap:8px;padding:9px 16px;font-size:14px;font-weight:550;display:inline-flex}.btn:active{transform:scale(.98)}.btn-primary{background-color:var(--accent-primary);color:#fff}.btn-primary:hover{background-color:var(--accent-primary-hover);box-shadow:0 4px 12px #3b82f640}.btn-secondary{background-color:var(--bg-card);border-color:var(--border-subtle);color:var(--text-primary)}.btn-secondary:hover{background-color:var(--bg-secondary);border-color:var(--border-strong)}.status-pill-group{background-color:var(--bg-secondary);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);gap:4px;padding:3px;display:inline-flex}.status-pill{color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast);-webkit-user-select:none;user-select:none;background:0 0;border:none;border-radius:10px;padding:6px 13px;font-size:12.5px;font-weight:500}.status-pill.active-not-started{background-color:var(--bg-card);color:var(--text-muted);box-shadow:var(--shadow-sm)}.status-pill.active-learning{background-color:var(--accent-subtle);color:var(--accent-primary);box-shadow:var(--shadow-sm);font-weight:600}.status-pill.active-mastered{background-color:var(--status-completed-bg);color:var(--status-completed);box-shadow:var(--shadow-sm);font-weight:600}.modal-overlay{-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);z-index:1000;background-color:#00000073;justify-content:center;align-items:flex-start;padding-top:10vh;padding-left:16px;padding-right:16px;display:flex;position:fixed;inset:0}.modal-content{background-color:var(--bg-card);border:1px solid var(--border-strong);border-radius:var(--radius-lg);width:100%;max-width:580px;box-shadow:var(--shadow-lg);animation:.18s cubic-bezier(.16,1,.3,1) modalIn;overflow:hidden}@keyframes modalIn{0%{opacity:0;transform:translateY(-8px)scale(.98)}to{opacity:1;transform:translateY(0)scale(1)}}.mobile-bottom-nav{background-color:var(--bg-card);border-top:1px solid var(--border-subtle);z-index:90;height:62px;padding:0 12px;display:none;position:fixed;bottom:0;left:0;right:0;box-shadow:0 -4px 16px #0000000d}.mobile-bottom-nav-item{color:var(--text-muted);cursor:pointer;transition:color var(--transition-fast);background:0 0;border:none;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:3px;font-size:11px;font-weight:500;display:flex}.mobile-bottom-nav-item.active{color:var(--accent-primary);font-weight:600}@media (width<=768px){.sidebar{transform:translate(-100%);box-shadow:0 0 30px #00000040}.sidebar.open{transform:translate(0)}.main-wrapper{margin-left:0;padding-bottom:64px}.reading-progress-track{left:0}.page-content{padding:20px 16px 40px}.topbar{padding:0 16px}.topbar-search-btn{min-width:180px;padding:6px 10px;font-size:12px}.mobile-bottom-nav{justify-content:space-around;align-items:center;display:flex}h1{font-size:24px}h2{font-size:18px}}