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9999px;--sidebar-width: 260px;--transition: .2s ease;--transition-slow: .35s ease}[data-theme=dark]{--bg-main: #0f172a;--bg-card: #1e293b;--bg-sidebar: #020617;--bg-sidebar-hover: rgba(255,255,255,.06);--bg-input: #1e293b;--bg-tag: #334155;--text-primary: #f1f5f9;--text-secondary: #94a3b8;--text-muted: #64748b;--text-sidebar: #64748b;--border: #334155;--shadow-sm: 0 1px 3px rgba(0,0,0,.3);--shadow-md: 0 4px 16px rgba(0,0,0,.35);--shadow-lg: 0 10px 30px rgba(0,0,0,.45);--accent-light: rgba(99,102,241,.18);--success-light: rgba(16,185,129,.15);--danger-light: rgba(239,68,68,.15)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:15px;line-height:1.6;color:var(--text-primary);background:var(--bg-main);transition:background var(--transition),color 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h3{color:var(--text-secondary);font-size:1rem;font-weight:600}.empty-state p{font-size:.85rem;max-width:280px}#toast-container{position:fixed;bottom:24px;right:24px;z-index:9999;display:flex;flex-direction:column;gap:10px}.toast{background:var(--bg-card);border:1px solid var(--border);color:var(--text-primary);padding:12px 18px;border-radius:var(--radius-sm);box-shadow:var(--shadow-lg);font-size:.875rem;font-weight:500;animation:fadeInUp .3s ease;max-width:300px}.toast.toast-success{border-left:3px solid var(--success)}.toast.toast-info{border-left:3px solid var(--accent)}.sidebar{position:fixed;top:0;left:0;width:var(--sidebar-width);height:100vh;background:var(--bg-sidebar);display:flex;flex-direction:column;z-index:100;overflow-y:auto;overflow-x:hidden;transition:transform var(--transition-slow)}.sidebar-logo{display:flex;align-items:center;gap:10px;padding:24px 20px 20px;border-bottom:1px solid 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svg{opacity:1}.sidebar-section-title{font-size:.68rem;font-weight:700;letter-spacing:.1em;color:var(--text-sidebar);text-transform:uppercase;padding:14px 22px 8px;opacity:.6}.sidebar-subject-list{padding:0 12px;flex:1}.sidebar-subject-item{display:flex;align-items:center;gap:9px;padding:8px 10px;border-radius:var(--radius-sm);font-size:.83rem;font-weight:500;color:var(--text-sidebar);transition:background var(--transition),color var(--transition);cursor:pointer;text-decoration:none;margin-bottom:1px}.sidebar-subject-item:hover{background:var(--bg-sidebar-hover);color:#e2e8f0}.sidebar-subject-dot{width:7px;height:7px;border-radius:50%;flex-shrink:0}.sidebar-footer{padding:14px 16px;border-top:1px solid 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svg{width:15px;height:15px}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-outline{background:transparent;border:1px solid var(--border);color:var(--text-primary)}.btn-outline:hover{background:var(--bg-tag);border-color:var(--text-muted)}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-ghost:hover{background:var(--bg-tag);color:var(--text-primary)}.btn-sm{padding:5px 13px;font-size:.78rem}.search-bar{position:relative;width:100%}.search-bar svg{position:absolute;left:14px;top:50%;transform:translateY(-50%);width:17px;height:17px;color:var(--text-muted);pointer-events:none}.search-bar input{width:100%;padding:11px 14px 11px 42px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-input);color:var(--text-primary);font-size:.9rem;transition:border-color var(--transition),box-shadow var(--transition);outline:none}.search-bar input::placeholder{color:var(--text-muted)}.search-bar 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svg{width:12px;height:12px;color:#fff}.accordion-info{flex:1;min-width:0}.accordion-unit-label{font-size:.7rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted);margin-bottom:2px}.accordion-title{font-size:.95rem;font-weight:600;color:var(--text-primary)}.accordion-meta{display:flex;align-items:center;gap:10px;flex-shrink:0}.accordion-count{font-size:.75rem;color:var(--text-muted);display:flex;align-items:center;gap:4px}.accordion-count svg{width:13px;height:13px}.accordion-chevron{width:20px;height:20px;color:var(--text-muted);transition:transform var(--transition);flex-shrink:0}.accordion.open .accordion-chevron{transform:rotate(180deg)}.accordion-body{display:none;padding:0 20px 20px;border-top:1px solid var(--border)}.accordion.open .accordion-body{display:block}.accordion-desc{font-size:.83rem;color:var(--text-secondary);padding:14px 0 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0}.app{display:flex;min-height:100vh}.main{margin-left:var(--sidebar-width);flex:1;min-height:100vh;display:flex;flex-direction:column}.page{padding:32px 36px;max-width:1100px;width:100%}.page-header{margin-bottom:28px}.page-header h1{font-size:1.6rem;font-weight:800;color:var(--text-primary);letter-spacing:-.03em}.page-header p{margin-top:4px;font-size:.875rem;color:var(--text-secondary)}.welcome-section{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:28px 32px;margin-bottom:24px;display:flex;align-items:center;justify-content:space-between;gap:20px;box-shadow:var(--shadow-sm)}.welcome-text h1{font-size:1.75rem;font-weight:800;color:var(--text-primary);letter-spacing:-.03em}.welcome-text p{margin-top:4px;font-size:.9rem;color:var(--text-secondary)}.welcome-text p 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h4{font-size:.875rem;font-weight:600;color:var(--text-primary);margin-bottom:5px}.progress-item-meta{display:flex;align-items:center;justify-content:space-between;font-size:.75rem;color:var(--text-muted);margin-top:4px}.recent-section{display:flex;flex-direction:column;gap:8px}.subjects-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:18px}.subject-header{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:28px;margin-bottom:24px;display:flex;align-items:center;gap:20px;box-shadow:var(--shadow-sm);position:relative;overflow:hidden}.subject-header:after{content:"";position:absolute;top:0;left:0;bottom:0;width:4px;background:var(--subject-color, var(--accent))}.subject-header-icon{width:64px;height:64px;border-radius:var(--radius);display:flex;align-items:center;justify-content:center;font-size:2rem;flex-shrink:0}.subject-header-info{flex:1}.subject-header-badge{display:inline-flex;align-items:center;font-size:.68rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;padding:3px 9px;border-radius:var(--radius-full);background:var(--bg-tag);color:var(--text-muted);margin-bottom:6px}.subject-header-info h2{font-size:1.5rem;font-weight:800;color:var(--text-primary);letter-spacing:-.02em;margin-bottom:4px}.subject-header-info p{font-size:.875rem;color:var(--text-secondary);line-height:1.5}.units-controls{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.units-controls h2{font-size:1rem;color:var(--text-primary)}.units-list{display:flex;flex-direction:column;gap:12px}.favorites-group{margin-bottom:30px}.favorites-group-header{display:flex;align-items:center;gap:10px;margin-bottom:12px;padding-bottom:10px;border-bottom:1px solid var(--border)}.favorites-group-header h3{font-size:.95rem;color:var(--text-primary)}.favorites-group-icon{font-size:1.2rem}.favorites-unit-group{margin-bottom:16px}.favorites-unit-label{font-size:.75rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--text-muted);margin-bottom:8px}.search-hero{margin-bottom:24px}.search-hero h1{font-size:1.4rem;font-weight:800;color:var(--text-primary);letter-spacing:-.02em;margin-bottom:12px}.search-results-header{margin-bottom:16px}.search-result-group{margin-bottom:24px}.search-result-group-label{display:flex;align-items:center;gap:8px;margin-bottom:10px;font-size:.8rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--text-muted)}.search-result-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px;margin-bottom:8px;cursor:pointer;text-decoration:none;display:block;transition:box-shadow var(--transition),transform var(--transition)}.search-result-item:hover{box-shadow:var(--shadow-sm);transform:translateY(-1px)}.search-result-item h4{font-size:.9rem;font-weight:600;color:var(--text-primary);margin-bottom:3px}.search-result-item p{font-size:.78rem;color:var(--text-secondary)}.search-result-meta{font-size:.7rem;color:var(--text-muted);margin-top:4px;display:flex;gap:6px}@media (max-width: 1024px){.stats-grid{grid-template-columns:repeat(2,1fr)}.dashboard-two-col{grid-template-columns:1fr}.page{padding:24px}}@media (max-width: 768px){.sidebar{transform:translate(calc(-1 * var(--sidebar-width)))}.sidebar.open{transform:translate(0);box-shadow:var(--shadow-lg)}.topbar{display:flex}.main{margin-left:0}.page{padding:20px 16px}.welcome-section{padding:20px}.welcome-section{flex-direction:column;align-items:flex-start;gap:14px}.stats-grid{grid-template-columns:repeat(2,1fr);gap:10px}.subjects-grid,.resource-grid{grid-template-columns:1fr}.subject-header{flex-direction:column;align-items:flex-start;gap:14px}.subject-header:after{width:100%;height:3px;bottom:auto}.welcome-text h1{font-size:1.3rem}}@media (max-width: 480px){.stats-grid{grid-template-columns:1fr 1fr}}