:root{--font-main: "Plus Jakarta Sans", system-ui, -apple-system, sans-serif;--font-mono: "JetBrains Mono", monospace;--bg-dark: #080d1a;--bg-card: rgba(17, 24, 39, .85);--bg-card-hover: rgba(30, 41, 59, .95);--bg-input: rgba(15, 23, 42, .8);--bg-glass: rgba(17, 24, 39, .75);--border-subtle: rgba(255, 255, 255, .08);--border-hover: rgba(99, 102, 241, .4);--border-focus: #6366f1;--text-main: #f8fafc;--text-muted: #94a3b8;--text-dim: #64748b;--primary: #6366f1;--primary-hover: #4f46e5;--primary-glow: rgba(99, 102, 241, .25);--secondary: #8b5cf6;--accent-cyan: #06b6d4;--accent-pink: #ec4899;--success: #10b981;--success-bg: rgba(16, 185, 129, .12);--warning: #f59e0b;--warning-bg: rgba(245, 158, 11, .12);--danger: #ef4444;--danger-bg: rgba(239, 68, 68, .12);--info: #3b82f6;--info-bg: rgba(59, 130, 246, .12);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 18px;--radius-full: 9999px;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .2);--shadow-md: 0 8px 24px -4px rgba(0, 0, 0, .35);--shadow-lg: 0 20px 40px -8px rgba(0, 0, 0, .5);--shadow-glow: 0 0 24px -4px var(--primary-glow);--transition-fast: .15s ease;--transition-normal: .25s cubic-bezier(.4, 0, .2, 1)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-main);background:var(--bg-dark);color:var(--text-main);min-height:100vh;line-height:1.5;overflow-x:hidden;background-image:radial-gradient(at 10% 15%,rgba(99,102,241,.12) 0px,transparent 45%),radial-gradient(at 90% 85%,rgba(139,92,246,.1) 0px,transparent 40%),radial-gradient(at 50% 50%,rgba(6,182,212,.05) 0px,transparent 60%);background-attachment:fixed}button,input,select,textarea{font-family:inherit;color:inherit}.app-container{min-height:100vh;display:flex;flex-direction:column}.content-wrapper{max-width:1280px;width:100%;margin:0 auto;padding:2rem 1.5rem;flex:1}.navbar{position:sticky;top:0;z-index:40;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);background:var(--bg-glass);border-bottom:1px solid var(--border-subtle);transition:all var(--transition-normal)}.nav-container{max-width:1280px;margin:0 auto;padding:.85rem 1.5rem;display:flex;align-items:center;justify-content:space-between;gap:1rem}.nav-brand{display:flex;align-items:center;gap:.75rem;text-decoration:none;font-weight:800;font-size:1.35rem;color:var(--text-main);letter-spacing:-.02em}.brand-icon-box{width:40px;height:40px;border-radius:var(--radius-md);background:linear-gradient(135deg,#6366f1,#8b5cf6);display:flex;align-items:center;justify-content:center;box-shadow:0 4px 14px var(--primary-glow)}.brand-badge{font-size:.65rem;padding:.15rem .45rem;background:#6366f12e;border:1px solid rgba(99,102,241,.35);border-radius:var(--radius-full);color:#a5b4fc;font-weight:700;letter-spacing:.05em;text-transform:uppercase}.nav-tabs{display:flex;align-items:center;gap:.5rem;background:#0f172a99;padding:.3rem;border-radius:var(--radius-lg);border:1px solid var(--border-subtle)}.nav-tab-btn{display:flex;align-items:center;gap:.45rem;padding:.45rem .95rem;border-radius:var(--radius-md);border:none;background:transparent;color:var(--text-muted);font-size:.875rem;font-weight:600;cursor:pointer;transition:all var(--transition-fast)}.nav-tab-btn:hover{color:var(--text-main);background:#ffffff0d}.nav-tab-btn.active{color:var(--text-main);background:linear-gradient(135deg,#6366f159,#8b5cf640);border:1px solid rgba(99,102,241,.4);box-shadow:0 2px 10px #6366f133}.nav-actions{display:flex;align-items:center;gap:.75rem}.user-badge-chip{display:flex;align-items:center;gap:.6rem;padding:.35rem .75rem;background:#1e293b99;border:1px solid var(--border-subtle);border-radius:var(--radius-full);font-size:.85rem}.avatar-circle{width:28px;height:28px;border-radius:50%;background:linear-gradient(135deg,#06b6d4,#3b82f6);display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:700;color:#fff}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.6rem 1.2rem;font-size:.9rem;font-weight:600;border-radius:var(--radius-md);border:1px solid transparent;cursor:pointer;transition:all var(--transition-fast);text-decoration:none;white-space:nowrap}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;border-color:#ffffff1a;box-shadow:0 4px 14px var(--primary-glow)}.btn-primary:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 6px 20px #6366f166}.btn-secondary{background:#1e293bb3;color:var(--text-main);border-color:var(--border-subtle)}.btn-secondary:hover:not(:disabled){background:#334155cc;border-color:var(--border-hover)}.btn-danger{background:#ef444426;color:#f87171;border-color:#ef44444d}.btn-danger:hover:not(:disabled){background:#ef4444;color:#fff}.btn-icon{width:36px;height:36px;padding:0;border-radius:var(--radius-sm);display:inline-flex;align-items:center;justify-content:center;background:#1e293b99;border:1px solid var(--border-subtle);color:var(--text-muted);cursor:pointer;transition:all var(--transition-fast)}.btn-icon:hover{color:var(--text-main);background:#334155cc;border-color:var(--border-hover)}.btn-icon.active{color:#f59e0b;border-color:#f59e0b80;background:#f59e0b1f}.badge{display:inline-flex;align-items:center;gap:.35rem;padding:.2rem .6rem;font-size:.75rem;font-weight:600;border-radius:var(--radius-full);text-transform:capitalize;letter-spacing:.02em}.badge-notes{background:#10b98126;color:#34d399;border:1px solid rgba(16,185,129,.3)}.badge-assignment{background:#f59e0b26;color:#fbbf24;border:1px solid rgba(245,158,11,.3)}.badge-question-paper{background:#ef444426;color:#f87171;border:1px solid rgba(239,68,68,.3)}.badge-practical{background:#3b82f626;color:#60a5fa;border:1px solid rgba(59,130,246,.3)}.badge-ppt{background:#a855f726;color:#c084fc;border:1px solid rgba(168,85,247,.3)}.badge-reference{background:#06b6d426;color:#22d3ee;border:1px solid rgba(6,182,212,.3)}.badge-other{background:#94a3b826;color:#cbd5e1;border:1px solid rgba(148,163,184,.3)}.card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);padding:1.5rem;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:var(--shadow-sm);transition:all var(--transition-normal)}.card:hover{border-color:#6366f140;box-shadow:var(--shadow-md)}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.25rem;margin-bottom:2rem}.stat-card{display:flex;align-items:center;gap:1.25rem;padding:1.35rem;background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:transform var(--transition-fast),border-color var(--transition-fast)}.stat-card:hover{transform:translateY(-2px);border-color:#6366f14d}.stat-icon-wrapper{width:52px;height:52px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;flex-shrink:0}.stat-val{font-size:1.85rem;font-weight:800;letter-spacing:-.03em;color:var(--text-main);line-height:1.1}.stat-label{font-size:.85rem;color:var(--text-muted);font-weight:500;margin-top:.2rem}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#030712bf;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);display:flex;align-items:center;justify-content:center;z-index:50;padding:1.5rem;animation:fadeIn .2s ease-out}.modal-content{background:#0f172a;border:1px solid rgba(255,255,255,.12);border-radius:var(--radius-lg);width:100%;max-width:560px;max-height:90vh;overflow-y:auto;box-shadow:var(--shadow-lg);padding:2rem;position:relative;animation:slideUp .25s cubic-bezier(.16,1,.3,1)}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem}.modal-title{font-size:1.25rem;font-weight:700;letter-spacing:-.02em}.form-group{margin-bottom:1.25rem}.form-label{display:block;font-size:.85rem;font-weight:600;color:var(--text-muted);margin-bottom:.45rem}.form-input,.form-select,.form-textarea{width:100%;background:var(--bg-input);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:.65rem .95rem;font-size:.9rem;color:var(--text-main);outline:none;transition:all var(--transition-fast)}.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px var(--primary-glow)}.dropzone{border:2px dashed rgba(99,102,241,.35);background:#0f172a66;border-radius:var(--radius-lg);padding:2rem 1.5rem;text-align:center;cursor:pointer;transition:all var(--transition-normal)}.dropzone:hover,.dropzone.active{border-color:var(--primary);background:#6366f114}.toast-container{position:fixed;bottom:1.5rem;right:1.5rem;z-index:60;display:flex;flex-direction:column;gap:.65rem;pointer-events:none}.toast{pointer-events:auto;display:flex;align-items:center;gap:.75rem;padding:.85rem 1.25rem;border-radius:var(--radius-md);background:#1e293b;border:1px solid var(--border-subtle);box-shadow:var(--shadow-lg);color:var(--text-main);font-size:.9rem;font-weight:500;animation:slideInRight .25s ease}.toast-success{border-color:#10b98166;background:#064e3b}.toast-error{border-color:#ef444466;background:#450a0a}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInRight{0%{opacity:0;transform:translate(30px)}to{opacity:1;transform:translate(0)}}@media (max-width: 768px){.nav-tabs{order:3;width:100%;justify-content:center;margin-top:.5rem}.nav-container{flex-wrap:wrap}.stat-grid{grid-template-columns:1fr}}