:root{--primary:#6c63ff;--primary-dark:#5a52d5;--primary-light:#8b85ff;--primary-xlight:#eae9ff;--accent:#ff6584;--accent-light:#ffe4ea;--bg:#f8f7ff;--bg-card:#fff;--text:#1a1a2e;--text-muted:#6b7280;--text-light:#9ca3af;--border:#e5e7eb;--border-light:#f3f4f6;--success:#10b981;--warning:#f59e0b;--danger:#ef4444;--shadow-sm:0 1px 3px #6c63ff14, 0 1px 2px #0000000a;--shadow:0 4px 16px #6c63ff1f, 0 2px 8px #0000000f;--shadow-lg:0 10px 40px #6c63ff2e, 0 4px 16px #00000014;--radius:16px;--radius-sm:10px;--radius-xs:6px;--font:"Inter", sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font);background:var(--bg);color:var(--text);min-height:100vh;line-height:1.6}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--primary-light);border-radius:99px}.navbar{z-index:100;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border-bottom:1px solid var(--border);height:64px;box-shadow:var(--shadow-sm);background:#ffffffd9;justify-content:space-between;align-items:center;padding:0 24px;display:flex;position:sticky;top:0}.navbar-logo{color:var(--text);letter-spacing:-.5px;align-items:center;gap:10px;font-size:1.35rem;font-weight:800;text-decoration:none;display:flex}.navbar-logo .logo-icon{background:linear-gradient(135deg, var(--primary), var(--accent));color:#fff;border-radius:10px;justify-content:center;align-items:center;width:36px;height:36px;font-size:1.1rem;display:flex}.navbar-logo span{color:var(--primary)}.navbar-right{align-items:center;gap:12px;display:flex}.navbar-nav{align-items:center;gap:4px;display:flex}.nav-link{border-radius:var(--radius-xs);color:var(--text-muted);cursor:pointer;background:0 0;border:none;padding:7px 14px;font-size:.9rem;font-weight:500;text-decoration:none;transition:all .2s}.nav-link:hover,.nav-link.active{color:var(--primary);background:var(--primary-xlight)}.btn{border-radius:var(--radius-sm);font-family:var(--font);cursor:pointer;white-space:nowrap;border:none;justify-content:center;align-items:center;gap:8px;padding:10px 20px;font-size:.9rem;font-weight:600;text-decoration:none;transition:all .2s;display:inline-flex}.btn-primary{background:linear-gradient(135deg, var(--primary), var(--primary-dark));color:#fff;box-shadow:0 4px 14px #6c63ff66}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 20px #6c63ff80}.btn-outline{color:var(--primary);border:2px solid var(--primary);background:0 0}.btn-outline:hover{background:var(--primary-xlight)}.btn-ghost{color:var(--text-muted);border:1px solid var(--border);background:0 0}.btn-ghost:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-xlight)}.btn-accent{background:linear-gradient(135deg, var(--accent), #ff4f6e);color:#fff;box-shadow:0 4px 14px #ff658466}.btn-sm{border-radius:8px;padding:6px 14px;font-size:.82rem}.btn-xs{border-radius:6px;padding:4px 10px;font-size:.78rem}.btn:disabled{opacity:.6;cursor:not-allowed;transform:none!important}.user-avatar-btn{background:var(--primary-xlight);cursor:pointer;border:none;border-radius:99px;align-items:center;gap:8px;padding:6px 14px 6px 6px;transition:all .2s;display:flex}.user-avatar-btn:hover{background:var(--border)}.user-avatar-btn img{object-fit:cover;border-radius:50%;width:32px;height:32px}.user-avatar-btn .avatar-placeholder{background:linear-gradient(135deg, var(--primary), var(--accent));color:#fff;border-radius:50%;justify-content:center;align-items:center;width:32px;height:32px;font-size:.85rem;font-weight:700;display:flex}.user-avatar-btn span{color:var(--text);font-size:.85rem;font-weight:600}.btn-google{color:var(--text);border:1.5px solid var(--border);border-radius:var(--radius-sm);font-family:var(--font);cursor:pointer;box-shadow:var(--shadow-sm);background:#fff;align-items:center;gap:10px;padding:10px 20px;font-size:.9rem;font-weight:600;transition:all .2s;display:inline-flex}.btn-google:hover{border-color:var(--primary);box-shadow:var(--shadow);transform:translateY(-1px)}.btn-google svg{flex-shrink:0}.container{max-width:1200px;margin:0 auto;padding:0 24px}.page{min-height:calc(100vh - 64px)}.hidden{display:none!important}.hero{text-align:center;background:linear-gradient(135deg,#6c63ff 0%,#8b6fff 40%,#ff6584 100%);padding:100px 24px 80px;position:relative;overflow:hidden}.hero:before{content:"";background:url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Ccircle cx='30' cy='30' 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#00000040}.btn-hero-outline{color:#fff;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#ffffff26;border:2px solid #ffffff80;border-radius:12px;padding:14px 32px;font-size:1rem;font-weight:600}.btn-hero-outline:hover{background:#ffffff40}.hero-stats{flex-wrap:wrap;justify-content:center;gap:40px;margin-top:56px;display:flex}.hero-stat{text-align:center}.hero-stat .num{color:#fff;font-size:2rem;font-weight:900;line-height:1}.hero-stat .lbl{color:#ffffffbf;margin-top:4px;font-size:.82rem}.features{padding:80px 24px}.features .container{max-width:1100px}.section-title{text-align:center;color:var(--text);letter-spacing:-.5px;margin-bottom:12px;font-size:2rem;font-weight:800}.section-sub{text-align:center;color:var(--text-muted);margin-bottom:48px;font-size:1rem}.features-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px;display:grid}.feature-card{background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow-sm);padding:32px 28px;transition:all .3s;position:relative;overflow:hidden}.feature-card:before{content:"";background:linear-gradient(90deg, var(--primary), var(--accent));height:3px;transition:transform .3s;position:absolute;top:0;left:0;right:0;transform:scaleX(0)}.feature-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px)}.feature-card:hover:before{transform:scaleX(1)}.feature-icon{background:var(--primary-xlight);border-radius:14px;justify-content:center;align-items:center;width:56px;height:56px;margin-bottom:20px;font-size:1.5rem;display:flex}.feature-card h3{margin-bottom:10px;font-size:1.15rem;font-weight:700}.feature-card p{color:var(--text-muted);font-size:.92rem;line-height:1.6}.footer{background:var(--text);color:#ffffffb3;padding:48px 24px 32px}.footer-inner{max-width:1100px;margin:0 auto}.footer-top{flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:32px;margin-bottom:32px;display:flex}.footer-brand .logo{color:#fff;margin-bottom:8px;font-size:1.3rem;font-weight:800}.footer-brand p{max-width:280px;font-size:.88rem}.footer-links{flex-wrap:wrap;gap:48px;display:flex}.footer-col h4{color:#fff;margin-bottom:12px;font-size:.9rem;font-weight:600}.footer-col a{color:#fff9;cursor:pointer;margin-bottom:8px;font-size:.85rem;text-decoration:none;transition:color .2s;display:block}.footer-col a:hover{color:#fff}.footer-bottom{border-top:1px solid #ffffff1a;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding-top:24px;display:flex}.footer-bottom p{font-size:.82rem}.page-header{background:linear-gradient(135deg, var(--primary-xlight) 0%, var(--bg) 100%);border-bottom:1px solid var(--border);padding:40px 24px 32px}.page-header h1{margin-bottom:6px;font-size:1.8rem;font-weight:800}.page-header p{color:var(--text-muted);font-size:.95rem}.breadcrumb{color:var(--text-muted);align-items:center;gap:8px;margin-bottom:12px;font-size:.82rem;display:flex}.breadcrumb a{color:var(--primary);cursor:pointer;text-decoration:none}.breadcrumb a:hover{text-decoration:underline}.breadcrumb span{color:var(--border)}.filter-bar{border-bottom:1px solid var(--border);background:#fff;flex-wrap:wrap;align-items:center;gap:16px;padding:20px 24px;display:flex}.filter-label{color:var(--text-muted);white-space:nowrap;font-size:.85rem;font-weight:600}.filter-select{border-radius:var(--radius-xs);border:1.5px solid var(--border);font-family:var(--font);color:var(--text);cursor:pointer;appearance:none;background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236B7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E") right 10px center no-repeat;outline:none;padding:8px 30px 8px 14px;font-size:.88rem;transition:border-color .2s}.filter-select:focus{border-color:var(--primary)}.semester-btns{flex-wrap:wrap;gap:6px;display:flex}.sem-btn{border-radius:var(--radius-xs);border:1.5px solid var(--border);font-family:var(--font);color:var(--text-muted);cursor:pointer;background:#fff;padding:7px 14px;font-size:.82rem;font-weight:600;transition:all .2s}.sem-btn:hover{border-color:var(--primary);color:var(--primary)}.sem-btn.active{background:var(--primary);border-color:var(--primary);color:#fff;box-shadow:0 2px 8px #6c63ff66}.cards-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px;padding:28px 24px;display:grid}.subject-card{border-radius:var(--radius);border:1.5px solid var(--border);cursor:pointer;box-shadow:var(--shadow-sm);background:#fff;padding:24px;transition:all .25s;position:relative;overflow:hidden}.subject-card:hover{border-color:var(--primary);box-shadow:var(--shadow);transform:translateY(-3px)}.subject-card-top{justify-content:space-between;align-items:flex-start;margin-bottom:14px;display:flex}.subject-card h3{flex:1;margin-right:12px;font-size:1rem;font-weight:700;line-height:1.4}.subject-card .meta{flex-wrap:wrap;gap:8px;margin-top:10px;display:flex}.subject-code{color:var(--primary);background:var(--primary-xlight);border-radius:4px;padding:3px 8px;font-size:.78rem;font-weight:700}.branch-badge{color:var(--text-muted);background:var(--border-light);border-radius:4px;padding:3px 8px;font-size:.78rem;font-weight:600}.card-arrow{background:var(--primary-xlight);width:32px;height:32px;color:var(--primary);border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;font-size:1rem;transition:all .2s;display:flex}.subject-card:hover .card-arrow{background:var(--primary);color:#fff}.badge{white-space:nowrap;border-radius:99px;align-items:center;padding:4px 10px;font-size:.75rem;font-weight:700;display:inline-flex}.badge-primary{background:var(--primary-xlight);color:var(--primary)}.badge-accent{background:var(--accent-light);color:var(--accent)}.badge-success{color:#059669;background:#d1fae5}.badge-warning{color:#d97706;background:#fef3c7}.badge-danger{color:#dc2626;background:#fee2e2}.badge-gray{background:var(--border-light);color:var(--text-muted)}.badge-mid{color:#7c3aed;background:#ede9fe}.badge-end{color:#db2777;background:#fce7f3}.paper-card{border-radius:var(--radius);border:1.5px solid var(--border);cursor:pointer;box-shadow:var(--shadow-sm);background:#fff;padding:24px;transition:all .25s}.paper-card:hover{border-color:var(--primary);box-shadow:var(--shadow);transform:translateY(-3px)}.paper-card-header{justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:16px;display:flex}.paper-card h3{flex:1;font-size:1rem;font-weight:700;line-height:1.4}.paper-meta{color:var(--text-muted);flex-wrap:wrap;gap:16px;font-size:.83rem;display:flex}.paper-meta-item{align-items:center;gap:5px;display:flex}.questions-list{flex-direction:column;gap:14px;padding:20px 24px;display:flex}.question-item{border-radius:var(--radius);border:1.5px solid var(--border);box-shadow:var(--shadow-sm);background:#fff;transition:border-color .2s;overflow:hidden}.question-item.expanded{border-color:var(--primary)}.question-header{cursor:pointer;align-items:flex-start;gap:14px;padding:18px 20px;transition:background .2s;display:flex}.question-header:hover{background:var(--primary-xlight)}.question-num{background:var(--primary);color:#fff;border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;width:34px;height:34px;font-size:.82rem;font-weight:800;display:flex}.question-main{flex:1}.question-text{margin-bottom:10px;font-size:.95rem;font-weight:500;line-height:1.6}.question-badges{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.question-expand-icon{background:var(--border-light);width:28px;height:28px;color:var(--text-muted);border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;font-size:.9rem;transition:all .3s;display:flex}.question-item.expanded .question-expand-icon{background:var(--primary);color:#fff;transform:rotate(180deg)}.question-body{border-top:1px solid var(--border);background:#fdfcff;padding:20px;display:none}.question-item.expanded .question-body{display:block}.ai-answer-block{border:1px solid var(--primary-xlight);border-radius:var(--radius-sm);background:linear-gradient(135deg,#f0efff,#fff0f5);margin-bottom:24px;padding:20px}.ai-answer-header{align-items:center;gap:10px;margin-bottom:14px;display:flex}.ai-badge{background:linear-gradient(135deg, var(--primary), var(--accent));color:#fff;border-radius:99px;align-items:center;gap:5px;padding:4px 12px;font-size:.78rem;font-weight:700;display:inline-flex}.ai-model-label{color:var(--text-muted);font-size:.78rem}.ai-answer-text{color:var(--text);white-space:pre-wrap;font-size:.92rem;line-height:1.8}.student-answers-section{margin-top:8px}.student-answers-header{justify-content:space-between;align-items:center;margin-bottom:16px;display:flex}.student-answers-header h4{font-size:1rem;font-weight:700}.student-answer-card{border-radius:var(--radius-sm);border:1px solid var(--border);background:#fff;margin-bottom:14px;padding:18px}.answer-author{align-items:center;gap:10px;margin-bottom:14px;display:flex}.author-avatar{object-fit:cover;border-radius:50%;flex-shrink:0;width:36px;height:36px}.author-avatar-placeholder{background:linear-gradient(135deg, var(--primary), var(--accent));color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;font-size:.85rem;font-weight:700;display:flex}.author-info{flex:1}.author-name{font-size:.9rem;font-weight:700}.answer-date{color:var(--text-muted);font-size:.78rem}.answer-content{color:var(--text);white-space:pre-wrap;margin-bottom:14px;font-size:.92rem;line-height:1.8}.answer-actions{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.like-btn{border:1.5px solid var(--border);cursor:pointer;font-family:var(--font);color:var(--text-muted);background:0 0;border-radius:99px;align-items:center;gap:6px;padding:5px 14px;font-size:.82rem;font-weight:600;transition:all 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textarea{width:100%;min-height:140px;font-family:var(--font);resize:vertical;color:var(--text);border:none;outline:none;padding:16px;font-size:.92rem;line-height:1.7}.write-answer-box textarea::placeholder{color:var(--text-light)}.write-answer-footer{border-top:1px solid var(--border);background:var(--border-light);justify-content:flex-end;gap:10px;padding:12px 16px;display:flex}.profile-hero{background:linear-gradient(135deg, var(--primary) 0%, #8b6fff 100%);padding:48px 24px 40px}.profile-hero-inner{flex-wrap:wrap;align-items:center;gap:24px;max-width:800px;margin:0 auto;display:flex}.profile-avatar-lg{object-fit:cover;border:4px solid #ffffff4d;border-radius:50%;width:88px;height:88px}.profile-avatar-lg-placeholder{color:#fff;background:#fff3;border:4px solid #ffffff4d;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:88px;height:88px;font-size:2rem;font-weight:800;display:flex}.profile-info{flex:1}.profile-name{color:#fff;margin-bottom:4px;font-size:1.6rem;font-weight:800}.profile-email{color:#fffc;margin-bottom:12px;font-size:.92rem}.profile-stats{flex-wrap:wrap;gap:24px;display:flex}.profile-stat{text-align:center}.profile-stat .num{color:#fff;font-size:1.5rem;font-weight:800}.profile-stat .lbl{color:#ffffffbf;font-size:.78rem}.profile-content{max-width:900px;margin:0 auto;padding:32px 24px}.profile-answer-card{border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow-sm);background:#fff;margin-bottom:16px;padding:20px}.profile-answer-q{color:var(--text-muted);margin-bottom:8px;font-size:.88rem}.profile-answer-preview{color:var(--text);margin-bottom:12px;font-size:.92rem;line-height:1.6}.profile-answer-meta{flex-wrap:wrap;align-items:center;gap:14px;display:flex}.spinner-wrap{justify-content:center;align-items:center;padding:64px 24px;display:flex}.spinner{border:3px solid var(--primary-xlight);border-top-color:var(--primary);border-radius:50%;width:42px;height:42px;animation:.7s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.empty-state{text-align:center;color:var(--text-muted);padding:64px 24px}.empty-state .empty-icon{opacity:.6;margin-bottom:16px;font-size:3.5rem}.empty-state h3{color:var(--text);margin-bottom:8px;font-size:1.15rem;font-weight:700}.empty-state p{max-width:320px;margin:0 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