@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap";:root{--bg-primary:#07080c;--bg-secondary:#0b0d13;--bg-surface:#0f1117;--bg-surface-2:#141722;--bg-surface-hover:#1a1e2e;--bg-surface-active:#1e2235;--bg-elevated:#181c28;--border-subtle:#ffffff0f;--border-default:#ffffff1a;--border-strong:#ffffff26;--border-accent:#6366f166;--text-primary:#f1f5f9;--text-secondary:#94a3b8;--text-tertiary:#64748b;--text-muted:#475569;--text-inverse:#0f172a;--accent-indigo:#6366f1;--accent-indigo-light:#818cf8;--accent-indigo-dark:#4f46e5;--accent-indigo-glow:#6366f126;--accent-indigo-subtle:#6366f114;--accent-emerald:#10b981;--accent-emerald-light:#34d399;--accent-emerald-glow:#10b98126;--accent-amber:#f59e0b;--accent-amber-light:#fbbf24;--accent-amber-glow:#f59e0b26;--accent-red:#ef4444;--accent-red-light:#f87171;--accent-red-glow:#ef444426;--accent-cyan:#06b6d4;--accent-cyan-glow:#06b6d426;--accent-purple:#a855f7;--accent-purple-glow:#a855f726;--accent-pink:#ec4899;--accent-pink-glow:#ec489926;--gradient-primary:linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);--gradient-success:linear-gradient(135deg, #10b981 0%, #06b6d4 100%);--gradient-warning:linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);--gradient-surface:linear-gradient(180deg, var(--bg-surface) 0%, var(--bg-surface-2) 100%);--shadow-sm:0 1px 2px #0000004d;--shadow-md:0 4px 6px -1px #0000004d, 0 2px 4px -2px #0000004d;--shadow-lg:0 10px 15px -3px #0006, 0 4px 6px -4px #0000004d;--shadow-xl:0 20px 25px -5px #00000080, 0 8px 10px -6px #0006;--shadow-glow-indigo:0 0 20px #6366f126;--shadow-glow-emerald:0 0 20px #10b98126;--space-xxs:4px;--space-xs:8px;--space-sm:12px;--space-md:16px;--space-lg:24px;--space-xl:32px;--space-2xl:48px;--space-3xl:64px;--radius-sm:6px;--radius-md:10px;--radius-lg:14px;--radius-xl:20px;--radius-full:9999px;--font-family:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono:"JetBrains Mono", "Fira Code", monospace;--font-size-xs:.75rem;--font-size-sm:.8125rem;--font-size-base:.875rem;--font-size-md:1rem;--font-size-lg:1.125rem;--font-size-xl:1.25rem;--font-size-2xl:1.5rem;--font-size-3xl:1.875rem;--font-size-4xl:2.25rem;--line-height-tight:1.25;--line-height-normal:1.5;--line-height-relaxed:1.75;--sidebar-width:260px;--sidebar-collapsed-width:72px;--header-height:0px;--content-max-width:1400px;--transition-fast:.15s ease;--transition-base:.2s ease;--transition-slow:.3s ease;--transition-spring:.4s cubic-bezier(.34, 1.56, .64, 1);--z-sidebar:100;--z-header:90;--z-modal-backdrop:200;--z-modal:210;--z-toast:300;--scrollbar-width:6px;--scrollbar-track:transparent;--scrollbar-thumb:#ffffff1a;--scrollbar-thumb-hover:#fff3}[data-theme=light]{--bg-primary:#f8fafc;--bg-secondary:#f1f5f9;--bg-surface:#fff;--bg-surface-2:#f8fafc;--bg-surface-hover:#f1f5f9;--bg-surface-active:#e2e8f0;--bg-elevated:#fff;--border-subtle:#0000000f;--border-default:#0000001a;--border-strong:#00000026;--border-accent:#4f46e54d;--text-primary:#0f172a;--text-secondary:#475569;--text-tertiary:#64748b;--text-muted:#94a3b8;--text-inverse:#f1f5f9;--accent-indigo:#4f46e5;--accent-indigo-light:#6366f1;--accent-indigo-glow:#4f46e51a;--accent-indigo-subtle:#4f46e50d;--accent-emerald:#059669;--accent-emerald-light:#10b981;--accent-emerald-glow:#0596691a;--accent-amber:#d97706;--accent-amber-light:#f59e0b;--accent-amber-glow:#d977061a;--accent-red:#dc2626;--accent-red-light:#ef4444;--accent-red-glow:#dc26261a;--accent-cyan:#0891b2;--accent-cyan-glow:#0891b21a;--accent-purple:#9333ea;--accent-purple-glow:#9333ea1a;--shadow-sm:0 1px 2px #0000000d;--shadow-md:0 4px 6px -1px #00000012, 0 2px 4px -2px #0000000d;--shadow-lg:0 10px 15px -3px #00000014, 0 4px 6px -4px #0000000d;--shadow-xl:0 20px 25px -5px #0000001a, 0 8px 10px -6px #0000000d;--shadow-glow-indigo:0 0 20px #4f46e51a;--scrollbar-thumb:#00000026;--scrollbar-thumb-hover:#00000040}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizelegibility;font-size:16px}body{font-family:var(--font-family);font-size:var(--font-size-base);line-height:var(--line-height-normal);color:var(--text-primary);background-color:var(--bg-primary);min-height:100vh;overflow-x:hidden}#root{min-height:100vh}a{color:var(--accent-indigo-light);transition:color var(--transition-fast);text-decoration:none}a:hover{color:var(--accent-indigo)}img{max-width:100%;display:block}button{font-family:var(--font-family);cursor:pointer;font-size:inherit;background:0 0;border:none;outline:none}input,select,textarea{font-family:var(--font-family);font-size:var(--font-size-base)}::-webkit-scrollbar{width:var(--scrollbar-width);height:var(--scrollbar-width)}::-webkit-scrollbar-track{background:var(--scrollbar-track)}::-webkit-scrollbar-thumb{background:var(--scrollbar-thumb);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--scrollbar-thumb-hover)}.app-layout{background:var(--bg-base);flex-direction:column;min-height:100vh;display:flex}.app-body-container{flex:1;display:flex;position:relative}.main-content{margin-left:var(--sidebar-width);padding:var(--space-xl);min-height:calc(100vh - 60px);transition:margin-left var(--transition-slow);max-width:calc(100vw - var(--sidebar-width));flex:1}.main-content.sidebar-collapsed{margin-left:var(--sidebar-collapsed-width);max-width:calc(100vw - var(--sidebar-collapsed-width))}.sidebar{width:var(--sidebar-width);background:var(--bg-surface);border-right:1px solid var(--border-subtle);height:calc(100vh - 60px);z-index:var(--z-sidebar);transition:width var(--transition-slow), transform var(--transition-slow);flex-direction:column;display:flex;position:fixed;top:60px;left:0;overflow:hidden}.sidebar.collapsed{width:var(--sidebar-collapsed-width)}.sidebar-brand{padding:var(--space-lg);align-items:center;gap:var(--space-sm);border-bottom:1px solid var(--border-subtle);min-height:72px;display:flex}.sidebar-brand-icon{border-radius:var(--radius-md);background:var(--gradient-primary);color:#fff;width:36px;height:36px;font-weight:800;font-size:var(--font-size-lg);flex-shrink:0;justify-content:center;align-items:center;display:flex}.sidebar-brand-text{white-space:nowrap;flex-direction:column;display:flex;overflow:hidden}.sidebar-brand-text h1{font-size:var(--font-size-md);color:var(--text-primary);letter-spacing:-.02em;font-weight:700}.sidebar-brand-text span{font-size:var(--font-size-xs);color:var(--text-tertiary);font-weight:500}.sidebar-nav{padding:var(--space-sm);flex-direction:column;flex:1;gap:2px;display:flex;overflow-y:auto}.sidebar-nav-item{align-items:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-md);border-radius:var(--radius-md);color:var(--text-secondary);font-weight:500;font-size:var(--font-size-base);transition:all var(--transition-fast);cursor:pointer;white-space:nowrap;text-decoration:none;display:flex;position:relative}.sidebar-nav-item:hover{background:var(--bg-surface-hover);color:var(--text-primary)}.sidebar-nav-item.active{background:var(--accent-indigo-subtle);color:var(--accent-indigo-light)}.sidebar-nav-item.active:before{content:"";background:var(--accent-indigo);border-radius:0 var(--radius-full) var(--radius-full) 0;width:3px;height:20px;position:absolute;top:50%;left:0;transform:translateY(-50%)}.sidebar-nav-icon{flex-shrink:0;width:20px;height:20px}.sidebar-nav-label{text-overflow:ellipsis;overflow:hidden}.sidebar-toggle{border-radius:var(--radius-full);background:var(--bg-surface);border:1px solid var(--border-default);width:28px;height:28px;color:var(--text-secondary);cursor:pointer;z-index:10;transition:all var(--transition-fast);box-shadow:var(--shadow-md);justify-content:center;align-items:center;display:flex;position:absolute;top:24px;right:-14px}.sidebar-toggle:hover{background:var(--bg-surface-hover);color:var(--text-primary)}.sidebar-footer{padding:var(--space-md);border-top:1px solid var(--border-subtle)}.sidebar-countdown{padding:var(--space-sm) var(--space-md);background:var(--accent-indigo-subtle);border-radius:var(--radius-md);text-align:center}.sidebar-countdown-days{font-size:var(--font-size-2xl);color:var(--accent-indigo-light);font-weight:800;line-height:1}.sidebar-countdown-label{font-size:var(--font-size-xs);color:var(--text-secondary);margin-top:2px}.mobile-menu-btn{top:var(--space-md);left:var(--space-md);z-index:calc(var(--z-sidebar) + 1);border-radius:var(--radius-md);background:var(--bg-surface);border:1px solid var(--border-default);width:40px;height:40px;color:var(--text-primary);box-shadow:var(--shadow-md);justify-content:center;align-items:center;display:none;position:fixed}.sidebar-overlay{display:none}.page-header{margin-bottom:var(--space-xl)}.page-header h2{font-size:var(--font-size-2xl);color:var(--text-primary);letter-spacing:-.02em;font-weight:700}.page-header p{color:var(--text-secondary);margin-top:var(--space-xxs);font-size:var(--font-size-base)}.page-header-row{justify-content:space-between;align-items:center;gap:var(--space-md);flex-wrap:wrap;display:flex}.card{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);padding:var(--space-lg);transition:all var(--transition-base)}.card:hover{border-color:var(--border-default)}.card-header{margin-bottom:var(--space-md);justify-content:space-between;align-items:center;display:flex}.card-title{font-size:var(--font-size-base);color:var(--text-primary);align-items:center;gap:var(--space-xs);font-weight:600;display:flex}.card-subtitle{font-size:var(--font-size-sm);color:var(--text-secondary)}.stat-card{background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);padding:var(--space-lg);gap:var(--space-xs);transition:all var(--transition-base);flex-direction:column;display:flex;position:relative;overflow:hidden}.stat-card:before{content:"";opacity:0;height:2px;transition:opacity var(--transition-base);position:absolute;top:0;left:0;right:0}.stat-card:hover{border-color:var(--border-default);box-shadow:var(--shadow-md);transform:translateY(-2px)}.stat-card:hover:before{opacity:1}.stat-card.accent-indigo:before{background:var(--gradient-primary)}.stat-card.accent-emerald:before{background:var(--accent-emerald)}.stat-card.accent-amber:before{background:var(--accent-amber)}.stat-card.accent-red:before{background:var(--accent-red)}.stat-card.accent-cyan:before{background:var(--accent-cyan)}.stat-card.accent-purple:before{background:var(--accent-purple)}.stat-card-icon{border-radius:var(--radius-md);width:40px;height:40px;margin-bottom:var(--space-xxs);justify-content:center;align-items:center;display:flex}.stat-card-icon.indigo{background:var(--accent-indigo-glow);color:var(--accent-indigo-light)}.stat-card-icon.emerald{background:var(--accent-emerald-glow);color:var(--accent-emerald)}.stat-card-icon.amber{background:var(--accent-amber-glow);color:var(--accent-amber)}.stat-card-icon.red{background:var(--accent-red-glow);color:var(--accent-red)}.stat-card-icon.cyan{background:var(--accent-cyan-glow);color:var(--accent-cyan)}.stat-card-icon.purple{background:var(--accent-purple-glow);color:var(--accent-purple)}.stat-card-value{font-size:var(--font-size-3xl);color:var(--text-primary);font-weight:800;line-height:var(--line-height-tight);letter-spacing:-.03em}.stat-card-label{font-size:var(--font-size-sm);color:var(--text-secondary);font-weight:500}.stat-card-trend{font-size:var(--font-size-xs);border-radius:var(--radius-full);align-items:center;gap:4px;padding:2px 8px;font-weight:600;display:inline-flex}.stat-card-trend.up{color:var(--accent-emerald);background:var(--accent-emerald-glow)}.stat-card-trend.down{color:var(--accent-red);background:var(--accent-red-glow)}.grid-2{gap:var(--space-lg);grid-template-columns:repeat(2,1fr);display:grid}.grid-3{gap:var(--space-lg);grid-template-columns:repeat(3,1fr);display:grid}.grid-4{gap:var(--space-lg);grid-template-columns:repeat(4,1fr);display:grid}.grid-auto{gap:var(--space-lg);grid-template-columns:repeat(auto-fill,minmax(280px,1fr));display:grid}.progress-bar-container{width:100%}.progress-bar-header{margin-bottom:var(--space-xxs);justify-content:space-between;align-items:center;display:flex}.progress-bar-label{font-size:var(--font-size-sm);color:var(--text-secondary);font-weight:500}.progress-bar-value{font-size:var(--font-size-sm);color:var(--text-primary);font-weight:600}.progress-bar-track{background:var(--bg-surface-hover);border-radius:var(--radius-full);width:100%;height:8px;overflow:hidden}.progress-bar-track.thin{height:4px}.progress-bar-track.thick{height:12px}.progress-bar-fill{border-radius:var(--radius-full);height:100%;transition:width .8s cubic-bezier(.34,1.56,.64,1);position:relative}.progress-bar-fill.indigo{background:var(--gradient-primary)}.progress-bar-fill.emerald{background:var(--accent-emerald)}.progress-bar-fill.amber{background:var(--accent-amber)}.progress-bar-fill.red{background:var(--accent-red)}.progress-bar-fill.cyan{background:var(--accent-cyan)}.progress-bar-fill.purple{background:var(--accent-purple)}.progress-bar-fill:after{content:"";background:linear-gradient(90deg,#0000,#ffffff26,#0000);animation:2s ease-in-out infinite shimmer;position:absolute;inset:0}.progress-ring-wrapper{align-items:center;gap:var(--space-xs);flex-direction:column;display:flex}.progress-ring{justify-content:center;align-items:center;display:inline-flex;position:relative}.progress-ring svg{transform:rotate(-90deg)}.progress-ring-track{stroke:var(--bg-surface-hover);fill:none}.progress-ring-fill{fill:none;stroke-linecap:round;transition:stroke-dashoffset 1s cubic-bezier(.34,1.56,.64,1)}.progress-ring-text{flex-direction:column;justify-content:center;align-items:center;display:flex;position:absolute}.progress-ring-value{color:var(--text-primary);font-weight:800;line-height:1}.progress-ring-label{font-size:var(--font-size-xs);color:var(--text-secondary)}.pill-badge{border-radius:var(--radius-full);font-size:var(--font-size-xs);white-space:nowrap;align-items:center;gap:4px;padding:3px 10px;font-weight:600;display:inline-flex}.pill-badge.not-started{background:var(--bg-surface-hover);color:var(--text-tertiary)}.pill-badge.in-progress{background:var(--accent-amber-glow);color:var(--accent-amber)}.pill-badge.completed{background:var(--accent-emerald-glow);color:var(--accent-emerald)}.pill-badge.mastered{background:var(--accent-indigo-glow);color:var(--accent-indigo-light)}.pill-badge.overdue,.pill-badge.high{background:var(--accent-red-glow);color:var(--accent-red)}.pill-badge.medium{background:var(--accent-amber-glow);color:var(--accent-amber)}.pill-badge.low,.pill-badge.easy{background:var(--accent-emerald-glow);color:var(--accent-emerald)}.pill-badge.hard{background:var(--accent-red-glow);color:var(--accent-red)}.pill-badge.correct{background:var(--accent-emerald-glow);color:var(--accent-emerald)}.pill-badge.wrong{background:var(--accent-red-glow);color:var(--accent-red)}.btn{justify-content:center;align-items:center;gap:var(--space-xs);padding:var(--space-xs) var(--space-md);border-radius:var(--radius-md);font-weight:600;font-size:var(--font-size-sm);transition:all var(--transition-fast);white-space:nowrap;height:38px;display:inline-flex}.btn-primary{background:var(--gradient-primary);color:#fff;box-shadow:var(--shadow-sm), var(--shadow-glow-indigo)}.btn-primary:hover{box-shadow:var(--shadow-md), 0 0 30px #6366f140;transform:translateY(-1px)}.btn-secondary{background:var(--bg-surface-hover);color:var(--text-primary);border:1px solid var(--border-default)}.btn-secondary:hover{background:var(--bg-surface-active);border-color:var(--border-strong)}.btn-danger{background:var(--accent-red-glow);color:var(--accent-red);border:1px solid #ef444433}.btn-danger:hover{background:#ef444433}.btn-ghost{color:var(--text-secondary);background:0 0}.btn-ghost:hover{background:var(--bg-surface-hover);color:var(--text-primary)}.btn-sm{height:32px;padding:var(--space-xxs) var(--space-sm);font-size:var(--font-size-xs)}.btn-lg{height:44px;padding:var(--space-sm) var(--space-lg);font-size:var(--font-size-base)}.btn-icon{border-radius:var(--radius-md);width:38px;height:38px;padding:0}.btn-icon.btn-sm{width:32px;height:32px}.form-group{gap:var(--space-xxs);flex-direction:column;display:flex}.form-label{font-size:var(--font-size-sm);color:var(--text-secondary);font-weight:500}.form-input,.form-select,.form-textarea{width:100%;padding:var(--space-xs) var(--space-sm);background:var(--bg-surface-hover);border:1px solid var(--border-default);border-radius:var(--radius-md);color:var(--text-primary);font-size:var(--font-size-base);transition:all var(--transition-fast);height:38px}.form-textarea{resize:vertical;height:auto;min-height:80px}.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--accent-indigo);box-shadow:0 0 0 3px var(--accent-indigo-glow);outline:none}.form-input::placeholder{color:var(--text-muted)}.form-row{gap:var(--space-md);grid-template-columns:repeat(2,1fr);display:grid}.form-row-3{gap:var(--space-md);grid-template-columns:repeat(3,1fr);display:grid}.form-checkbox{align-items:center;gap:var(--space-xs);cursor:pointer;display:flex}.form-checkbox input[type=checkbox]{width:18px;height:18px;accent-color:var(--accent-indigo);cursor:pointer}.modal-backdrop{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:var(--z-modal-backdrop);padding:var(--space-lg);background:#0009;justify-content:center;align-items:center;animation:.2s fadeIn;display:flex;position:fixed;inset:0}.modal{background:var(--bg-surface);border:1px solid var(--border-default);border-radius:var(--radius-xl);width:100%;max-width:560px;max-height:85vh;box-shadow:var(--shadow-xl);z-index:var(--z-modal);animation:.3s slideUp;overflow-y:auto}.modal.modal-lg{max-width:720px}.modal-header{padding:var(--space-lg);border-bottom:1px solid var(--border-subtle);justify-content:space-between;align-items:center;display:flex}.modal-title{font-size:var(--font-size-lg);color:var(--text-primary);font-weight:700}.modal-close{border-radius:var(--radius-md);width:32px;height:32px;color:var(--text-tertiary);transition:all var(--transition-fast);justify-content:center;align-items:center;display:flex}.modal-close:hover{background:var(--bg-surface-hover);color:var(--text-primary)}.modal-body{padding:var(--space-lg);gap:var(--space-md);flex-direction:column;display:flex}.modal-footer{justify-content:flex-end;align-items:center;gap:var(--space-sm);padding:var(--space-md) var(--space-lg);border-top:1px solid var(--border-subtle);display:flex}.data-table-wrapper{border-radius:var(--radius-lg);border:1px solid var(--border-subtle);overflow-x:auto}.data-table{border-collapse:collapse;width:100%}.data-table th{background:var(--bg-surface-hover);padding:var(--space-sm) var(--space-md);font-size:var(--font-size-xs);color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.05em;text-align:left;white-space:nowrap;border-bottom:1px solid var(--border-subtle);cursor:pointer;-webkit-user-select:none;user-select:none;font-weight:600}.data-table th:hover{color:var(--text-primary)}.data-table td{padding:var(--space-sm) var(--space-md);border-bottom:1px solid var(--border-subtle);font-size:var(--font-size-sm);color:var(--text-primary);white-space:nowrap}.data-table tr:hover td{background:var(--bg-surface-hover)}.data-table tr:last-child td{border-bottom:none}.tabs{background:var(--bg-surface-hover);border-radius:var(--radius-md);margin-bottom:var(--space-lg);gap:2px;padding:3px;display:flex;overflow-x:auto}.tab{padding:var(--space-xs) var(--space-md);border-radius:var(--radius-sm);font-size:var(--font-size-sm);color:var(--text-secondary);transition:all 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