:root{--bg-primary: #090d16;--bg-secondary: #0f1523;--bg-card: rgba(17, 24, 39, .78);--bg-card-elevated: #131b2e;--bg-card-hover: rgba(30, 41, 59, .85);--bg-input: #151d30;--bg-glass: rgba(15, 23, 42, .75);--bg-toolbar: rgba(15, 23, 42, .88);--bg-pill: rgba(255, 255, 255, .06);--bg-pill-hover: rgba(255, 255, 255, .12);--border-subtle: rgba(255, 255, 255, .08);--border-card: rgba(255, 255, 255, .1);--border-focus: #6366f1;--border-light: rgba(255, 255, 255, .16);--accent-primary: #6366f1;--accent-primary-hover: #4f46e5;--accent-secondary: #8b5cf6;--accent-cyan: #06b6d4;--accent-emerald: #10b981;--accent-amber: #f59e0b;--accent-rose: #f43f5e;--gradient-brand: linear-gradient(135deg, #6366f1 0%, #06b6d4 100%);--gradient-card: linear-gradient(180deg, rgba(255, 255, 255, .03) 0%, rgba(255, 255, 255, 0) 100%);--gradient-glow: radial-gradient(circle at 50% -20%, rgba(99, 102, 241, .25), transparent 70%);--text-primary: #f8fafc;--text-secondary: #94a3b8;--text-muted: #64748b;--text-accent: #818cf8;--text-on-accent: #ffffff;--font-display: "Outfit", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", "Fira Code", monospace;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .25);--shadow-md: 0 4px 12px -1px rgba(0, 0, 0, .35), 0 2px 6px -2px rgba(0, 0, 0, .3);--shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, .45), 0 6px 12px -4px rgba(0, 0, 0, .35);--shadow-dock: 0 20px 40px -10px rgba(0, 0, 0, .6), 0 0 0 1px rgba(255, 255, 255, .1);--shadow-glow: 0 0 25px rgba(99, 102, 241, .35);--shadow-cyan-glow: 0 0 20px rgba(6, 182, 212, .35);--shadow-emerald-glow: 0 0 20px rgba(16, 185, 129, .35);--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .25s cubic-bezier(.4, 0, .2, 1);--transition-slow: .4s cubic-bezier(.4, 0, .2, 1);--ease-spring: cubic-bezier(.175, .885, .32, 1.275);--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 22px;--radius-full: 9999px;--header-height: 64px;--sidebar-width: 320px;--sidebar-collapsed-width: 0px;--player-height: 84px}[data-theme=light]{--bg-primary: #f8fafc;--bg-secondary: #ffffff;--bg-card: #ffffff;--bg-card-elevated: #ffffff;--bg-card-hover: #f1f5f9;--bg-input: #f1f5f9;--bg-glass: rgba(255, 255, 255, .88);--bg-toolbar: #f8fafc;--bg-pill: #e2e8f0;--bg-pill-hover: #cbd5e1;--border-subtle: #e2e8f0;--border-card: #e2e8f0;--border-focus: #4f46e5;--border-light: #cbd5e1;--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #64748b;--text-accent: #4f46e5;--text-on-accent: #ffffff;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 12px -2px rgba(15, 23, 42, .08), 0 2px 4px -2px rgba(15, 23, 42, .04);--shadow-lg: 0 12px 24px -4px rgba(15, 23, 42, .1), 0 4px 8px -2px rgba(15, 23, 42, .04);--shadow-dock: 0 16px 36px -8px rgba(15, 23, 42, .14), 0 0 0 1px rgba(0, 0, 0, .06);--shadow-glow: 0 0 20px rgba(79, 70, 229, .2);--shadow-cyan-glow: 0 0 20px rgba(6, 182, 212, .2);--shadow-emerald-glow: 0 0 20px rgba(16, 185, 129, .2);--gradient-card: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);--gradient-glow: radial-gradient(circle at 50% -20%, rgba(99, 102, 241, .12), transparent 70%)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{width:100%;height:100%;background-color:var(--bg-primary);color:var(--text-primary);font-family:var(--font-body);font-size:15px;line-height:1.5;overflow:hidden;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#app{display:flex;flex-direction:column;width:100vw;height:100vh;overflow:hidden;background:radial-gradient(circle at 10% 20%,rgba(99,102,241,.08) 0%,transparent 40%),radial-gradient(circle at 90% 80%,rgba(6,182,212,.06) 0%,transparent 40%),var(--bg-primary)}.app-header{height:var(--header-height);border-bottom:1px solid var(--border-subtle);background:var(--bg-glass);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);display:flex;align-items:center;justify-content:space-between;padding:0 20px;z-index:50;flex-shrink:0;gap:12px}.brand-area{display:flex;align-items:center;gap:10px;cursor:pointer}.sidebar-toggle-btn{width:34px;height:34px;border-radius:var(--radius-md);border:1px solid var(--border-subtle);background:var(--bg-pill);color:var(--text-secondary);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all var(--transition-fast);flex-shrink:0}.sidebar-toggle-btn:hover{background:var(--bg-pill-hover);color:var(--text-primary);border-color:var(--border-light)}.sidebar-toggle-btn i,.sidebar-toggle-btn svg{width:17px;height:17px}.brand-logo{width:36px;height:36px;border-radius:var(--radius-md);background:linear-gradient(135deg,var(--accent-primary),var(--accent-cyan));display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-glow);color:#fff;font-weight:700;font-family:var(--font-display);cursor:pointer;transition:transform var(--transition-fast)}.brand-logo:hover{transform:scale(1.05)}.brand-title{font-family:var(--font-display);font-size:19px;font-weight:800;background:linear-gradient(135deg,var(--text-primary) 0%,var(--accent-primary) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:-.02em}.brand-badge{font-size:10px;font-weight:800;padding:1px 7px;border-radius:var(--radius-full);background:#6366f126;color:var(--accent-cyan);border:1px solid rgba(6,182,212,.35);text-transform:uppercase;letter-spacing:.5px}.module-nav{display:flex;align-items:center;gap:4px;background:var(--bg-pill);padding:4px;border-radius:var(--radius-full);border:1px solid var(--border-subtle);overflow:visible;flex-shrink:0}.nav-tab-btn{display:inline-flex;align-items:center;gap:6px;padding:6px 13px;border-radius:var(--radius-full);border:none;background:transparent;color:var(--text-secondary);font-size:12.5px;font-weight:600;cursor:pointer;white-space:nowrap;flex-shrink:0;-webkit-user-select:none;user-select:none;transition:all var(--transition-fast);position:relative}.nav-tab-btn:hover{color:var(--text-primary);background:var(--bg-pill-hover)}.nav-tab-btn.active{background:var(--gradient-brand);color:#fff;box-shadow:0 2px 12px #6366f173}.nav-tab-btn i,.nav-tab-btn svg{width:14px;height:14px;pointer-events:none}.nav-badge-ai{font-size:9px;font-weight:800;padding:1px 5px;border-radius:var(--radius-full);background:linear-gradient(135deg,#06b6d4,#8b5cf6);color:#fff;letter-spacing:.5px;line-height:1.2}.nav-dropdown-wrapper{position:relative;display:inline-block}.nav-dropdown-trigger{padding-right:10px}.dropdown-chevron-icon{width:12px!important;height:12px!important;transition:transform var(--transition-fast);color:var(--text-muted)}.nav-dropdown-wrapper.open .dropdown-chevron-icon{transform:rotate(180deg);color:var(--text-primary)}.nav-dropdown-menu{position:absolute;top:calc(100% + 8px);right:0;width:290px;background:var(--bg-secondary);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);box-shadow:0 16px 36px #00000073,0 0 0 1px #ffffff0d;padding:8px;display:none;flex-direction:column;gap:3px;z-index:1000;backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);animation:dropdownFadeIn .18s cubic-bezier(.16,1,.3,1)}@keyframes dropdownFadeIn{0%{opacity:0;transform:translateY(-8px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}.nav-dropdown-wrapper.open .nav-dropdown-menu{display:flex}.dropdown-section-header{padding:8px 10px 4px}.dropdown-section-title{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.8px;color:var(--text-muted)}.nav-dropdown-item{display:flex;align-items:center;gap:10px;width:100%;padding:8px 10px;border-radius:var(--radius-md);border:1px solid transparent;background:transparent;color:var(--text-primary);text-align:left;cursor:pointer;transition:all var(--transition-fast)}.nav-dropdown-item:hover{background:var(--bg-pill-hover);border-color:var(--border-subtle);transform:translate(2px)}.nav-dropdown-item.active{background:#6366f11f;border-color:#6366f14d}.dropdown-item-icon{width:32px;height:32px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;flex-shrink:0}.dropdown-item-icon i,.dropdown-item-icon svg{width:16px;height:16px}.dropdown-item-icon.accent-purple{background:#a855f726;color:#c084fc}.dropdown-item-icon.accent-emerald{background:#10b98126;color:#34d399}.dropdown-item-icon.accent-blue{background:#3b82f626;color:#60a5fa}.dropdown-item-icon.accent-amber{background:#f59e0b26;color:#fbbf24}.dropdown-item-icon.accent-cyan{background:#06b6d426;color:#22d3ee}.dropdown-item-content{display:flex;flex-direction:column;min-width:0}.dropdown-item-title{font-size:13px;font-weight:600;color:var(--text-primary)}.dropdown-item-desc{font-size:11px;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.header-actions{display:flex;align-items:center;gap:10px;flex-shrink:0}.user-streak-widget{display:flex;align-items:center;gap:5px;background:var(--bg-pill);padding:3px 5px;border-radius:var(--radius-full);border:1px solid var(--border-subtle)}.streak-pill,.xp-pill{display:inline-flex;align-items:center;gap:4px;padding:3px 8px;border-radius:var(--radius-full);font-size:11.5px;font-weight:700;background:#ffffff0a;color:var(--text-secondary)}.streak-pill strong{color:#f59e0b}.xp-pill strong{color:#06b6d4}.admin-header-badge-btn{display:inline-flex;align-items:center;gap:7px;padding:6px 12px;border-radius:var(--radius-full);background:#6366f11f;border:1px solid rgba(99,102,241,.35);color:var(--text-primary);font-size:12px;font-weight:600;cursor:pointer;transition:all var(--transition-fast)}.admin-header-badge-btn:hover{background:#6366f13d;border-color:var(--accent-primary);box-shadow:0 0 16px #6366f159;transform:translateY(-1px)}.admin-header-badge-btn i,.admin-header-badge-btn svg{width:14px;height:14px;color:var(--accent-cyan)}.admin-header-badge-btn kbd{font-family:var(--font-mono);font-size:10px;padding:1px 5px;border-radius:4px;background:#ffffff14;color:var(--text-muted);border:1px solid rgba(255,255,255,.1)}.media-source-btn{display:flex;align-items:center;gap:6px;padding:6px 12px;background:#ffffff0f;border:1px solid var(--border-subtle);color:var(--text-primary);border-radius:var(--radius-md);font-size:12.5px;font-weight:600;cursor:pointer;transition:all var(--transition-fast)}.media-source-btn:hover{background:#ffffff1a;border-color:var(--accent-primary)}.icon-button{width:36px;height:36px;border-radius:var(--radius-md);border:1px solid var(--border-subtle);background:#ffffff0a;color:var(--text-secondary);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all var(--transition-fast)}.icon-button:hover{color:var(--text-primary);background:#ffffff14;border-color:var(--border-light)}.app-body{display:flex;flex:1;height:calc(100vh - var(--header-height) - var(--player-height));overflow:hidden;position:relative}.app-sidebar{width:var(--sidebar-width);background:var(--bg-secondary);border-right:1px solid var(--border-subtle);display:flex;flex-direction:column;flex-shrink:0;transition:width var(--transition-normal),opacity var(--transition-normal)}.app-sidebar.collapsed{width:0;min-width:0;overflow:hidden;border-right:none;opacity:0;pointer-events:none}.sidebar-header{padding:14px 16px;border-bottom:1px solid var(--border-subtle);display:flex;flex-direction:column;gap:10px}.sidebar-search-box{position:relative;display:flex;align-items:center;width:100%}.sidebar-search-icon{position:absolute;left:11px;width:14px;height:14px;color:var(--text-muted);pointer-events:none}.sidebar-search-input{width:100%;padding:8px 34px 8px 32px;border-radius:var(--radius-md);border:1px solid var(--border-subtle);background:var(--bg-input);color:var(--text-primary);font-size:12.5px;outline:none;transition:all var(--transition-fast)}.sidebar-search-kbd{position:absolute;right:9px;padding:2px 6px;border-radius:4px;font-size:10px;font-family:var(--font-mono);background:var(--bg-pill);border:1px solid var(--border-subtle);color:var(--text-muted);pointer-events:none}.course-switcher-wrapper{position:relative;width:100%}.course-switcher-btn{width:100%;display:flex;align-items:center;justify-content:space-between;padding:10px 12px;background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);text-align:left}.course-switcher-btn:hover{background:var(--bg-card-hover);border-color:var(--accent-primary);box-shadow:0 4px 14px #0003}.course-switcher-left{display:flex;align-items:center;gap:10px;min-width:0}.course-active-icon-box{width:34px;height:34px;border-radius:var(--radius-sm);background:linear-gradient(135deg,#6366f133,#06b6d433);border:1px solid rgba(99,102,241,.3);color:var(--accent-cyan);display:flex;align-items:center;justify-content:center;flex-shrink:0}.course-active-icon-box i,.course-active-icon-box svg{width:17px;height:17px}.course-switcher-text{display:flex;flex-direction:column;min-width:0}.course-active-eyebrow{font-size:9.5px;font-weight:700;text-transform:uppercase;letter-spacing:.6px;color:var(--text-muted)}.course-active-name{font-size:13px;font-weight:700;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.course-switcher-right{display:flex;align-items:center;gap:8px;flex-shrink:0}.course-units-badge{font-size:11px;font-weight:600;padding:2px 7px;border-radius:var(--radius-full);background:var(--bg-pill);color:var(--text-secondary);border:1px solid var(--border-subtle)}.course-switcher-chevron{width:14px!important;height:14px!important;color:var(--text-muted);transition:transform var(--transition-fast)}.course-switcher-wrapper.open .course-switcher-chevron{transform:rotate(180deg);color:var(--text-primary)}.course-selector-popover{position:absolute;top:calc(100% + 8px);left:0;width:100%;min-width:320px;background:var(--bg-secondary);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);box-shadow:0 20px 48px #0009,0 0 0 1px #ffffff0d;padding:12px;display:none;flex-direction:column;gap:10px;z-index:1000;backdrop-filter:blur(28px);-webkit-backdrop-filter:blur(28px);animation:dropdownFadeIn .18s cubic-bezier(.16,1,.3,1)}.course-switcher-wrapper.open .course-selector-popover{display:flex}.popover-header{display:flex;flex-direction:column;gap:2px;padding-bottom:6px;border-bottom:1px solid var(--border-subtle)}.popover-title{font-size:13.5px;font-weight:700;color:var(--text-primary)}.popover-subtitle{font-size:11.5px;color:var(--text-muted)}.course-filter-chips{display:flex;gap:4px}.course-chip-btn{flex:1;padding:4px 6px;border-radius:var(--radius-sm);border:1px solid var(--border-subtle);background:var(--bg-pill);color:var(--text-secondary);font-size:11px;font-weight:600;cursor:pointer;transition:all var(--transition-fast)}.course-chip-btn:hover{background:var(--bg-pill-hover);color:var(--text-primary)}.course-chip-btn.active{background:var(--accent-primary);color:#fff;border-color:var(--accent-primary)}.course-popover-list{display:flex;flex-direction:column;gap:6px;max-height:280px;overflow-y:auto;padding-right:4px}.course-popover-item{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;border-radius:var(--radius-md);border:1px solid var(--border-subtle);background:var(--bg-card);cursor:pointer;transition:all var(--transition-fast)}.course-popover-item:hover{background:var(--bg-card-hover);border-color:var(--accent-primary);transform:translateY(-1px)}.course-popover-item.active{border-color:var(--accent-cyan);background:#06b6d414}.course-item-left{display:flex;align-items:center;gap:10px;min-width:0}.course-item-icon{width:32px;height:32px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;background:var(--bg-pill);color:var(--accent-primary);flex-shrink:0}.course-item-icon i,.course-item-icon svg{width:16px;height:16px}.course-item-info{display:flex;flex-direction:column;min-width:0}.course-item-title{font-size:13px;font-weight:600;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.course-item-sub{font-size:11px;color:var(--text-muted)}.course-item-badge{font-size:10.5px;font-weight:700;padding:2px 6px;border-radius:var(--radius-full);background:#6366f126;color:var(--accent-cyan);flex-shrink:0}.popover-footer{padding-top:6px;border-top:1px solid var(--border-subtle)}.sidebar-progress-card{padding:8px 10px;border-radius:var(--radius-sm);background:#ffffff08;border:1px solid var(--border-subtle);display:flex;flex-direction:column;gap:5px}.sidebar-progress-label{display:flex;justify-content:space-between;font-size:11.5px;color:var(--text-secondary)}.sidebar-progress-label strong{color:var(--accent-emerald)}.sidebar-progress-track{width:100%;height:5px;background:#ffffff14;border-radius:var(--radius-full);overflow:hidden}.sidebar-progress-bar{height:100%;background:linear-gradient(90deg,var(--accent-primary),var(--accent-cyan));border-radius:var(--radius-full);transition:width .3s ease}.unit-list{flex:1;overflow-y:auto;padding:10px 10px 100px;display:flex;flex-direction:column;gap:5px}.unit-item{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:var(--radius-md);border:1px solid transparent;cursor:pointer;transition:all var(--transition-fast);color:var(--text-secondary);position:relative;background:transparent}.unit-item:hover{background:var(--bg-card-hover);color:var(--text-primary);border-color:var(--border-subtle);transform:translate(2px)}.unit-item.active{background:var(--bg-card-elevated);border-color:#6366f173;color:var(--text-primary);box-shadow:var(--shadow-sm)}.unit-item.active:before{content:"";position:absolute;left:0;top:8px;bottom:8px;width:3.5px;border-radius:0 4px 4px 0;background:linear-gradient(180deg,var(--accent-primary),var(--accent-cyan));box-shadow:0 0 10px var(--accent-primary)}.unit-index-pill{width:30px;height:30px;border-radius:8px;background:var(--bg-input);border:1px solid var(--border-subtle);display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-size:11.5px;font-weight:700;color:var(--text-muted);flex-shrink:0;transition:all var(--transition-fast)}.unit-item.active .unit-index-pill{background:#6366f126;border-color:#6366f166;color:var(--accent-cyan)}.unit-card-body{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}.unit-card-sub{display:flex;align-items:center;gap:6px}.unit-topic-tag{font-size:11px;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:140px}.unit-level-chip{font-size:9.5px;font-weight:700;padding:1px 6px;border-radius:4px;background:#ffffff0d;border:1px solid var(--border-subtle);color:var(--text-muted);text-transform:uppercase}.unit-progress-indicator{color:var(--text-muted);display:flex;align-items:center;transition:color var(--transition-fast)}.unit-item.active .unit-progress-indicator{color:var(--accent-cyan);filter:drop-shadow(0 0 6px var(--accent-cyan))}.unit-item:hover .unit-index-pill{color:var(--text-primary);border-color:var(--border-light)}.unit-item.active .unit-index-pill{background:var(--gradient-brand);color:#fff;border:none;box-shadow:0 2px 8px #6366f166}.unit-card-body{display:flex;flex-direction:column;gap:3px;flex:1;overflow:hidden}.unit-card-title{font-size:13px;font-weight:600;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;letter-spacing:-.01em}.unit-card-sub{display:flex;align-items:center;gap:6px;font-size:11px}.unit-topic-tag{color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:140px}.unit-level-chip{font-size:9.5px;font-weight:700;padding:1px 5px;border-radius:4px;background:var(--bg-pill);color:var(--text-accent);border:1px solid var(--border-subtle);flex-shrink:0;text-transform:uppercase}.unit-progress-indicator{color:var(--text-muted);display:flex;align-items:center;justify-content:center;flex-shrink:0;opacity:.6;transition:all var(--transition-fast)}.unit-item:hover .unit-progress-indicator{opacity:1;color:var(--accent-primary);transform:translate(1px)}.unit-item.active .unit-progress-indicator{opacity:1;color:var(--accent-cyan)}.sidebar-search-box{position:relative;display:flex;align-items:center}.sidebar-search-icon{position:absolute;left:10px;width:14px;height:14px;color:var(--text-muted);pointer-events:none}.sidebar-search-input{width:100%;padding:7px 10px 7px 32px;border-radius:var(--radius-md);border:1px solid var(--border-subtle);background:var(--bg-input);color:var(--text-primary);font-size:12px;outline:none;transition:all var(--transition-fast)}.sidebar-search-input:focus{border-color:var(--accent-primary);box-shadow:0 0 0 2px #6366f133}.sidebar-search-input::placeholder{color:var(--text-muted)}.app-content{flex:1;overflow-y:auto;position:relative;background:transparent;display:flex;flex-direction:column;padding-bottom:90px}.module-container{flex:1;padding:24px 32px;max-width:1200px;width:100%;margin:0 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var(--border-subtle);background:var(--bg-input);color:var(--text-primary);font-size:13.5px;outline:none;transition:all var(--transition-fast)}.form-input:focus,.form-select:focus,.admin-form-input:focus,.admin-form-select:focus,.admin-form-textarea:focus{border-color:var(--accent-primary);box-shadow:0 0 0 3px #6366f133}.admin-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:8px 16px;border-radius:var(--radius-md);font-size:13px;font-weight:600;cursor:pointer;transition:all var(--transition-fast);border:1px solid transparent}.admin-btn.primary{background:var(--accent-primary);color:#fff;box-shadow:0 2px 10px #6366f14d}.admin-btn.primary:hover{background:var(--accent-primary-hover);transform:translateY(-1px)}.admin-btn.secondary{background:var(--bg-card-elevated);border-color:var(--border-subtle);color:var(--text-primary)}.admin-btn.secondary:hover{background:var(--bg-card-hover);border-color:var(--accent-primary)}.admin-btn.small{padding:5px 10px;font-size:12px}.action-icon-btn{width:32px;height:32px;border-radius:var(--radius-md);background:var(--bg-pill);border:1px solid var(--border-subtle);color:var(--text-secondary);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:all var(--transition-fast)}.action-icon-btn:hover{color:var(--text-primary);background:var(--bg-card-hover);border-color:var(--accent-primary)}.action-icon-btn.delete:hover{color:var(--accent-rose);background:#ef444426;border-color:#ef444459}.action-icon-btn i,.action-icon-btn svg{width:15px;height:15px}.filter-chip{padding:6px 14px;border-radius:var(--radius-full);background:var(--bg-pill);border:1px solid var(--border-subtle);font-size:12px;font-weight:600;color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast)}.filter-chip:hover{color:var(--text-primary);border-color:var(--accent-primary)}.filter-chip.active{background:#6366f126;border-color:var(--accent-primary);color:var(--accent-primary)}.admin-form-textarea{width:100%;padding:10px 14px;border-radius:var(--radius-md);border:1px solid var(--border-subtle);background:var(--bg-input);color:var(--text-primary);font-size:13.5px;outline:none;transition:all var(--transition-fast)}.admin-form-input:focus,.admin-form-select:focus,.admin-form-textarea:focus{border-color:var(--accent-primary);box-shadow:0 0 0 3px #6366f133}.admin-modal-footer{padding:16px 24px;border-top:1px solid var(--border-subtle);background:var(--bg-card-elevated);display:flex;align-items:center;justify-content:flex-end;gap:10px}.subtitle-studio-layout{display:flex;flex-direction:column;gap:20px}.subtitle-waveform-card{padding:20px;border-radius:var(--radius-lg);background:var(--bg-card);border:1px solid var(--border-card);display:flex;flex-direction:column;gap:14px}.subtitle-player-controls{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}.sentence-editor-table input,.sentence-editor-table textarea{width:100%;background:var(--bg-input);border:1px solid var(--border-subtle);color:var(--text-primary);border-radius:6px;padding:6px 10px;font-size:12.5px;outline:none}.sentence-editor-table input:focus,.sentence-editor-table textarea:focus{border-color:var(--accent-primary)}.status-badge{display:inline-flex;align-items:center;gap:6px;padding:3px 8px;border-radius:var(--radius-full);font-size:11px;font-weight:700}.status-badge.success{background:#10b9812e;color:var(--accent-emerald);border:1px solid rgba(16,185,129,.35)}.status-badge.warning{background:#f59e0b2e;color:var(--accent-amber);border:1px solid rgba(245,158,11,.35)}.status-badge.info{background:#06b6d42e;color:var(--accent-cyan);border:1px solid rgba(6,182,212,.35)}@keyframes soundwavePulse{0%{height:4px}50%{height:16px}to{height:4px}}.playing-spectrum-bars{display:inline-flex;align-items:center;gap:2px;height:16px;vertical-align:middle}.playing-spectrum-bars span{width:2.5px;height:6px;background:var(--accent-cyan);border-radius:1px;animation:soundwavePulse .8s ease-in-out infinite}.playing-spectrum-bars span:nth-child(2){animation-delay:.15s}.playing-spectrum-bars span:nth-child(3){animation-delay:.3s}.playing-spectrum-bars span:nth-child(4){animation-delay:.45s}.admin-breadcrumb-bar{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--text-muted);margin-bottom:12px}.admin-breadcrumb-bar span{color:var(--text-secondary)}.admin-breadcrumb-bar span.active{color:var(--text-primary);font-weight:600}