:root{--blue: #0057B7;--blue-dark: #003D8A;--blue-light: #EEF4FF;--orange: #FF6B00;--orange-light: #FFF3E8;--green: #00C46A;--red: #FF3B5C;--text: #0F1D35;--muted: #64748B;--border: #E2E8F4;--card: #FFFFFF;--bg: #F7F9FC;--sidebar-w: 240px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:DM Sans,sans-serif;background:var(--bg);color:var(--text);overflow-x:hidden}button{cursor:pointer;font-family:DM Sans,sans-serif}a{text-decoration:none;color:inherit}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}.btn{border:none;font-family:DM Sans,sans-serif;font-weight:600;border-radius:10px;transition:all .2s;cursor:pointer}.btn-ghost{background:#ffffff1f;color:#fff;padding:10px 22px;font-size:14px;border:1px solid rgba(255,255,255,.2)}.btn-ghost:hover{background:#ffffff38}.btn-ghost-dark{background:transparent;color:var(--text);padding:10px 22px;font-size:14px;border:1px solid var(--border)}.btn-ghost-dark:hover{background:var(--bg)}.btn-primary{background:var(--orange);color:#fff;padding:11px 28px;font-size:14px}.btn-primary:hover{background:#e55d00;transform:translateY(-1px)}.btn-blue{background:var(--blue);color:#fff;padding:11px 28px;font-size:14px}.btn-blue:hover{background:var(--blue-dark);transform:translateY(-1px)}.card{background:var(--card);border-radius:16px;padding:22px;border:1px solid var(--border)}.card-title{font-weight:700;font-size:15px;margin-bottom:16px;display:flex;align-items:center;gap:8px}.stat-card{padding:20px}.stat-card .sc-icon{font-size:28px;margin-bottom:12px}.stat-card .sc-val{font-family:Syne,sans-serif;font-size:28px;font-weight:800}.stat-card .sc-lbl{color:var(--muted);font-size:12px;margin-top:3px}.stat-card .sc-change{font-size:12px;font-weight:600;margin-top:6px}.pos{color:var(--green)}.neg{color:var(--red)}.prog-bar{background:var(--border);border-radius:10px;height:8px;overflow:hidden;margin-top:8px}.prog-fill{height:100%;border-radius:10px;transition:width .6s ease}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:24px}.grid-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:20px;margin-bottom:24px}.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:24px}.alert-box{border-radius:12px;padding:14px 18px;margin-bottom:14px;display:flex;align-items:flex-start;gap:12px}.alert-warn{background:var(--orange-light);border:1px solid rgba(255,107,0,.25)}.alert-info{background:var(--blue-light);border:1px solid rgba(0,87,183,.2)}.alert-success{background:#f0fff8;border:1px solid rgba(0,196,106,.3)}.alert-icon{font-size:18px;flex-shrink:0}.alert-text{font-size:13.5px;line-height:1.5}.alert-text strong{display:block;font-weight:700;margin-bottom:2px}.tag{display:inline-block;font-size:11px;font-weight:600;padding:3px 8px;border-radius:6px}.tag-phys{background:#eff6ff;color:#3b82f6}.tag-chem{background:#f0fff4;color:#16a34a}.tag-math{background:#fdf4ff;color:#9333ea}.tag-hard{background:#fff1f2;color:#be123c}.tag-med{background:#fffbeb;color:#b45309}.tag-easy{background:#f0fff4;color:#15803d}.tag-jee{background:var(--blue-light);color:var(--blue)}.tag-cbse{background:var(--orange-light);color:var(--orange)}.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}.section-title{font-family:Syne,sans-serif;font-size:18px;font-weight:700}.subject-row{display:flex;align-items:center;gap:12px;padding:10px 0;border-bottom:1px solid var(--border)}.subject-row:last-child{border-bottom:none}.sub-icon{width:36px;height:36px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0}.sub-name{flex:1;font-weight:600;font-size:14px}.chapter-list{display:flex;flex-direction:column;gap:10px}.chapter-card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:16px 20px;display:flex;align-items:center;gap:16px;cursor:pointer;transition:all .2s}.chapter-card:hover{border-color:var(--blue);box-shadow:0 4px 20px #0057b71a}.ch-icon{width:44px;height:44px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0}.ch-info{flex:1}.ch-title{font-weight:700;font-size:15px}.ch-meta{color:var(--muted);font-size:12px;margin-top:3px}.ch-right{display:flex;flex-direction:column;align-items:flex-end;gap:6px}.ch-pct{font-family:Syne,sans-serif;font-weight:800;font-size:18px}.ch-status{font-size:11px;font-weight:600;padding:3px 10px;border-radius:8px}.s-pending{background:var(--orange-light);color:var(--orange)}.s-progress{background:var(--blue-light);color:var(--blue)}.s-done{background:#f0fff8;color:var(--green)}.plan-item{display:flex;align-items:center;gap:14px;padding:12px 0;border-bottom:1px solid var(--border);cursor:pointer;transition:background .15s}.plan-item:last-child{border-bottom:none}.plan-item:hover{background:var(--bg);margin:0 -10px;padding:12px 10px;border-radius:10px}.pi-check{width:22px;height:22px;border-radius:6px;border:2px solid var(--border);display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:12px}.pi-check.done{background:var(--green);border-color:var(--green);color:#fff}.pi-info{flex:1}.pi-title{font-weight:600;font-size:14px}.pi-meta{color:var(--muted);font-size:12px;margin-top:2px}.pi-tag{font-size:11px;font-weight:600;padding:3px 8px;border-radius:6px}.options-grid{display:flex;flex-direction:column;gap:10px}.option{display:flex;align-items:center;gap:14px;border:2px solid var(--border);border-radius:12px;padding:14px 18px;cursor:pointer;transition:all .18s;background:#fff}.option:hover,.option.selected{border-color:var(--blue);background:var(--blue-light)}.option.correct{border-color:var(--green);background:#f0fff8}.option.wrong{border-color:var(--red);background:#fff0f3}.opt-letter{width:32px;height:32px;border-radius:8px;background:var(--border);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;flex-shrink:0}.option.selected .opt-letter{background:var(--blue);color:#fff}.opt-text{font-size:15px}.modal-overlay{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:1000;align-items:center;justify-content:center}.modal-overlay.show{display:flex}.modal{background:#fff;border-radius:20px;padding:32px;max-width:480px;width:90%;animation:slideUp .3s ease}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}.modal-title{font-family:Syne,sans-serif;font-size:20px;font-weight:800;margin-bottom:16px}.mistake-item{display:flex;align-items:center;gap:12px;padding:10px 0;border-bottom:1px solid var(--border)}.mistake-item:last-child{border-bottom:none}.mi-dot{width:10px;height:10px;border-radius:50%;flex-shrink:0}.mi-text{flex:1;font-size:13px}.mi-pct{font-weight:700;font-size:13px}.week-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:8px;margin-bottom:24px}.day-card{background:var(--card);border-radius:12px;padding:12px;border:1px solid var(--border);text-align:center;cursor:pointer;transition:all .18s}.day-card:hover{border-color:var(--blue);transform:translateY(-2px)}.day-card.today{border-color:var(--blue);background:var(--blue-light)}.day-card.done{background:#f0fff8;border-color:var(--green)}.day-name{font-size:11px;font-weight:700;color:var(--muted);letter-spacing:1px;text-transform:uppercase}.day-num{font-family:Syne,sans-serif;font-size:24px;font-weight:800;margin:4px 0}.day-dots{display:flex;justify-content:center;gap:3px}.dot{width:6px;height:6px;border-radius:50%}.chat-area{background:var(--card);border-radius:16px;border:1px solid var(--border);display:flex;flex-direction:column;height:580px}.chat-header{padding:18px 22px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:12px}.ai-avatar{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--orange));display:flex;align-items:center;justify-content:center;font-size:18px}.ai-name{font-weight:700;font-size:15px}.ai-status{font-size:12px;color:var(--green)}.chat-messages{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:16px}.msg{max-width:85%}.msg-ai{align-self:flex-start}.msg-user{align-self:flex-end}.msg-bubble{padding:13px 16px;border-radius:16px;font-size:14px;line-height:1.6;white-space:pre-wrap}.msg-ai .msg-bubble{background:var(--bg);border:1px solid var(--border);border-bottom-left-radius:4px}.msg-user .msg-bubble{background:var(--blue);color:#fff;border-bottom-right-radius:4px}.msg-meta{font-size:11px;color:var(--muted);margin-top:4px;padding:0 4px}.msg-ai .msg-meta{text-align:left}.msg-user .msg-meta{text-align:right}.chat-input-area{padding:16px;border-top:1px solid var(--border);display:flex;gap:10px}.chat-input{flex:1;border:1.5px solid var(--border);border-radius:10px;padding:11px 16px;font-family:DM Sans,sans-serif;font-size:14px;outline:none;resize:none;transition:border-color .15s}.chat-input:focus{border-color:var(--blue)}.send-btn{background:var(--blue);color:#fff;border:none;border-radius:10px;padding:11px 18px;cursor:pointer;font-size:18px;transition:all .15s}.send-btn:hover{background:var(--blue-dark)}.bar-chart{display:flex;align-items:flex-end;gap:10px;height:180px;padding:0 4px}.bar-wrap{flex:1;display:flex;flex-direction:column;align-items:center;gap:6px}.bar{width:100%;border-radius:6px 6px 0 0;min-height:10px}.bar-lbl{font-size:11px;color:var(--muted);font-weight:500}.bar-val{font-size:11px;font-weight:700;color:var(--text)}.snap-zone{border:2px dashed var(--border);border-radius:12px;padding:32px;text-align:center;cursor:pointer;transition:all .2s;margin-bottom:16px}.snap-zone:hover{border-color:var(--blue);background:var(--blue-light)}.snap-icon{font-size:40px;margin-bottom:10px}.snap-text{font-weight:600;font-size:14px}.snap-sub{color:var(--muted);font-size:12px;margin-top:4px}.cq-chip{background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:10px 14px;font-size:13px;cursor:pointer;transition:all .18s;display:flex;align-items:center;gap:8px;margin-bottom:8px}.cq-chip:hover{background:var(--blue-light);border-color:var(--blue)}.test-header{background:var(--blue-dark);border-radius:16px;padding:24px 28px;margin-bottom:24px;display:flex;align-items:center;justify-content:space-between;color:#fff}.test-timer{font-family:Syne,sans-serif;font-size:36px;font-weight:800;color:var(--orange)}.test-prog-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}.q-num{width:32px;height:32px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;cursor:pointer;transition:all .15s}.q-answered{background:var(--green);color:#fff}.q-current{background:var(--orange);color:#fff}.q-unanswered{background:#ffffff26;color:#ffffffb3}.q-marked{background:#8b5cf6;color:#fff}.ai-hint{background:linear-gradient(135deg,var(--orange-light),#FFF8F0);border:1px solid rgba(255,107,0,.2);border-radius:12px;padding:16px 18px;margin-top:16px;display:none}.ai-hint.show{display:block}.ai-hint-title{font-weight:700;font-size:13px;color:var(--orange);margin-bottom:6px}.ai-hint-text{font-size:13.5px;line-height:1.6;color:var(--text)}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#0a1628,#0057b7 60%,#003d8a);padding:24px}.auth-card{background:#fff;border-radius:20px;padding:40px;width:100%;max-width:440px}.auth-title{font-family:Syne,sans-serif;font-size:26px;font-weight:800;margin-bottom:6px}.auth-sub{color:var(--muted);font-size:14px;margin-bottom:28px}.form-group{margin-bottom:18px}.form-label{font-size:13px;font-weight:600;color:var(--text);margin-bottom:6px;display:block}.form-input{width:100%;border:1.5px solid var(--border);border-radius:10px;padding:12px 16px;font-family:DM Sans,sans-serif;font-size:14px;outline:none;transition:border-color .15s}.form-input:focus{border-color:var(--blue)}.form-error{color:var(--red);font-size:12px;margin-top:6px}.otp-row{display:flex;gap:8px}.otp-row .form-input{text-align:center;font-size:20px;font-weight:700;letter-spacing:6px}