:root{--kerala-blue:#1b4d7a;--kerala-green:#2d8659;--blue-light:#4a7ba7;--bg:#f4f7fb;--surface:#fff;--border:#e2e8f0;--text:#1a2433;--text-muted:#64748b;--easy:#2d8659;--medium:#c47f17;--hard:#c0392b;--correct-bg:#e6f4ec;--correct-border:#2d8659;--wrong-bg:#fbeaea;--wrong-border:#c0392b;--radius:12px;--shadow:0 2px 8px #1b4d7a14;--shadow-lg:0 8px 24px #1b4d7a1f;color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{background:var(--bg);min-height:100vh;margin:0}a{color:inherit;text-decoration:none}button{cursor:pointer;font-family:inherit}.topbar{background:var(--kerala-blue);color:#fff;box-shadow:var(--shadow);flex-wrap:wrap;align-items:center;gap:12px 16px;max-width:100%;padding:14px 28px;display:flex}.topbar .brand{letter-spacing:.2px;white-space:nowrap;flex-direction:column;font-size:20px;font-weight:700;line-height:1.15;display:flex}.topbar .brand span{color:#9fd9bb;letter-spacing:.5px;font-size:11px;font-weight:600}.topbar .brand{order:1}.topbar-controls{flex-wrap:wrap;order:2;justify-content:flex-end;align-items:center;gap:10px;margin-left:auto;display:flex}.topbar nav{flex-wrap:wrap;flex-basis:100%;order:3;gap:8px;display:flex}.topbar nav a{opacity:.85;border-radius:8px;padding:6px 14px;font-size:14px;transition:all .15s}.topbar nav a:hover,.topbar nav a.active{opacity:1;background:#ffffff29}.container{max-width:920px;margin:0 auto;padding:28px 20px 60px}.page-title{color:var(--kerala-blue);margin:0 0 4px;font-size:26px;font-weight:700}.page-sub{color:var(--text-muted);margin:0 0 24px;font-size:15px}.dash-head{flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:22px;display:flex}.subject-picker{color:var(--text-muted);flex-direction:column;gap:4px;font-size:12px;font-weight:600;display:flex}.subject-picker select{border:1.5px solid var(--border);color:var(--kerala-blue);cursor:pointer;background:#fff;border-radius:8px;padding:8px 12px;font-family:inherit;font-size:15px;font-weight:600}.subject-picker select:focus{border-color:var(--kerala-green);outline:none}.chapter-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;display:grid}.chapter-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);flex-direction:column;gap:10px;padding:18px;transition:transform .15s,box-shadow .15s;display:flex}.chapter-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-3px)}.chapter-card h3{color:var(--text);margin:0;font-size:16px}.chapter-card .count{color:var(--text-muted);font-size:13px}.chapter-card .bar{background:linear-gradient(90deg, var(--kerala-green), var(--blue-light));border-radius:4px;height:4px}.card-learn-link{color:var(--blue-light);border:1px solid var(--border);border-radius:999px;align-self:flex-start;padding:2px 8px;font-size:12px;font-weight:600;text-decoration:none}.card-learn-link:hover{background:var(--surface-alt,#0000000a)}.learn-card{color:inherit;text-decoration:none}.learn-doc{max-width:760px}.resume-card{background:linear-gradient(90deg, var(--kerala-green), var(--blue-light));color:#fff;border-radius:var(--radius);box-shadow:var(--shadow);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;margin-bottom:20px;padding:16px 20px;display:flex}.resume-card h3{margin:0 0 2px;font-size:16px}.resume-card .resume-sub{opacity:.92;margin:0;font-size:13px}.resume-card .btn-primary{color:var(--kerala-green);white-space:nowrap;background:#fff}.recommend-card{background:var(--accent-bg,#eef2ff);border:1px solid var(--accent-border,var(--border));border-left:4px solid var(--kerala-green);border-radius:var(--radius);margin-bottom:20px;padding:16px 18px}.recommend-card h3{color:var(--text);margin:0 0 2px;font-size:15px}.recommend-card .recommend-sub{color:var(--text-muted);margin:0 0 12px;font-size:13px}.recommend-chips{flex-wrap:wrap;gap:8px;display:flex}.recommend-chips .chip{background:var(--surface);border:1px solid var(--border);color:var(--kerala-blue,var(--text));cursor:pointer;border-radius:999px;padding:7px 14px;font-size:13px;font-weight:600;transition:border-color .15s,transform .1s}.recommend-chips .chip:hover{border-color:var(--kerala-green);transform:translateY(-1px)}.btn{border:none;border-radius:8px;padding:10px 18px;font-size:14px;font-weight:600;transition:opacity .15s,transform .1s}.btn:active{transform:scale(.98)}.btn-primary{background:var(--kerala-green);color:#fff}.btn-primary:hover{opacity:.92}.btn-outline{border:1px solid var(--border);color:var(--text);background:0 0}.btn-outline:hover{border-color:var(--blue-light);color:var(--kerala-blue)}.btn:disabled{opacity:.5;cursor:not-allowed}.quiz-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px}.quiz-meta{flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:16px;display:flex}.badge{text-transform:uppercase;letter-spacing:.5px;color:#fff;border-radius:20px;padding:3px 10px;font-size:11px;font-weight:700}.badge.easy{background:var(--easy)}.badge.medium{background:var(--medium)}.badge.hard{background:var(--hard)}.badge.topic{color:var(--text-muted);background:#eef2f7}.quiz-progress{color:var(--text-muted);margin-left:auto;font-size:13px;font-weight:600}.quiz-question{margin:0 0 22px;font-size:19px;font-weight:500;line-height:1.5}.options{flex-direction:column;gap:12px;display:flex}.option{border:1.5px solid var(--border);text-align:left;background:#fff;border-radius:10px;align-items:center;gap:12px;width:100%;padding:14px 16px;font-size:15px;transition:all .12s;display:flex}.option:hover:not(:disabled){border-color:var(--blue-light);background:#f8fbff}.option .label{width:26px;height:26px;color:var(--text-muted);background:#eef2f7;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:13px;font-weight:700;display:flex}.option.correct{background:var(--correct-bg);border-color:var(--correct-border)}.option.correct .label{background:var(--correct-border);color:#fff}.option.wrong{background:var(--wrong-bg);border-color:var(--wrong-border)}.option.wrong .label{background:var(--wrong-border);color:#fff}.explanation{border-left:4px solid var(--blue-light);background:#f0f6ff;border-radius:8px;margin-top:20px;padding:16px 18px;font-size:15px;line-height:1.55}.explanation strong{color:var(--kerala-blue)}.quiz-actions{align-items:center;gap:12px;margin-top:24px;display:flex}.score-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);text-align:center;box-shadow:var(--shadow);padding:40px}.score-big{color:var(--kerala-green);margin:8px 0;font-size:48px;font-weight:800}.state{text-align:center;color:var(--text-muted);padding:60px 20px}.spinner{border:4px solid var(--border);border-top-color:var(--kerala-green);border-radius:50%;width:36px;height:36px;margin:0 auto 16px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.error-box{background:var(--wrong-bg);border:1px solid var(--wrong-border);color:var(--hard);text-align:center;border-radius:8px;padding:16px}.topbar-subject{color:#fff;cursor:pointer;background:#ffffff24;border:1px solid #ffffff52;border-radius:8px;padding:6px 10px;font-family:inherit;font-size:13px;font-weight:700}.topbar-subject:focus{border-color:#9fd9bb;outline:none}.topbar-subject option{color:var(--text)}.topbar-board{background:#ffffff38;font-weight:800}.login-link{border:1px solid #fff6;border-radius:8px;font-size:14px;font-weight:600;padding:6px 16px!important}.login-link:hover{background:#ffffff29}.user-menu{align-items:center;gap:12px;display:flex}.user-greeting{color:#d7e6f2;font-size:14px}.logout-btn{color:#fff;background:#ffffff24;border:none;border-radius:8px;padding:6px 14px;font-size:13px;font-weight:600;transition:background .15s}.logout-btn:hover{background:#ffffff42}.auth-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-lg);margin-top:32px;padding:36px 32px}.auth-form{flex-direction:column;gap:16px;margin-top:8px;display:flex}.auth-form label{color:var(--text);flex-direction:column;gap:6px;font-size:14px;font-weight:600;display:flex}.auth-form input,.auth-form select{border:1.5px solid var(--border);background:#fff;border-radius:8px;padding:11px 13px;font-family:inherit;font-size:15px;transition:border-color .15s}.auth-form input:focus,.auth-form select:focus{border-color:var(--kerala-green);outline:none}.link-btn{color:var(--kerala-green);background:0 0;border:none;padding:0;font-size:14px;font-weight:700}.link-btn:hover{text-decoration:underline}.basis-banner{border-radius:10px;flex-wrap:wrap;align-items:center;gap:10px;padding:12px 16px;font-size:14px;line-height:1.5;display:flex}.basis-banner.heuristic{color:#8a6d3b;background:#fdf6ec;border:1px solid #f0e0c4}.basis-banner.data{background:var(--correct-bg);color:var(--kerala-green);border:1px solid #cce8d8}.basis-tag{white-space:nowrap;font-weight:700}.pred-rank{color:var(--blue-light);margin-right:4px;font-weight:800}.exam-intro{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px 26px}.exam-intro ul{color:var(--text);margin:0 0 20px;padding-left:20px;line-height:1.9}.mode-toggle{gap:10px;margin-bottom:12px;display:flex}.mode-btn{border:1.5px solid var(--border);color:var(--text);background:#fff;border-radius:10px;flex-direction:column;flex:1;align-items:center;gap:2px;padding:12px;font-size:15px;font-weight:700;transition:all .15s;display:flex}.mode-btn small{color:var(--text-muted);font-size:11px;font-weight:500}.mode-btn:hover{border-color:var(--blue-light)}.mode-btn.active{border-color:var(--kerala-blue);color:var(--kerala-blue);background:#eef4fb}.exam-mode-note{color:var(--text-muted);border-left:3px solid var(--blue-light);background:#f0f6ff;border-radius:6px;margin:0 0 14px;padding:9px 12px;font-size:13px;line-height:1.5}.exam-emphasis{color:#6b3fa0;background:#f3eefb;border:1px solid #e0d4f3;border-radius:10px;margin-bottom:12px;padding:10px 14px;font-size:14px}.exam-bar{z-index:5;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);align-items:center;gap:14px;margin-bottom:14px;padding:12px 16px;display:flex;position:sticky;top:0}.exam-timer{color:var(--kerala-blue);font-variant-numeric:tabular-nums;font-size:20px;font-weight:800}.exam-timer.low{color:var(--hard);animation:1s infinite pulse}@keyframes pulse{50%{opacity:.55}}.exam-progress{color:var(--text-muted);font-size:14px;font-weight:600}.exam-submit{margin-left:auto}.exam-nav{flex-wrap:wrap;gap:7px;margin-bottom:14px;display:flex}.exam-dot{border:1.5px solid var(--border);width:34px;height:34px;color:var(--text-muted);background:#fff;border-radius:8px;font-size:13px;font-weight:700;transition:all .12s}.exam-dot:hover{border-color:var(--blue-light)}.exam-dot.done{border-color:var(--kerala-green);color:var(--kerala-green);background:#e6f4ec}.exam-dot.current{outline:2px solid var(--kerala-blue);outline-offset:1px;color:var(--kerala-blue)}.option.selected{border-color:var(--kerala-blue);background:#eef4fb}.option.selected .label{background:var(--kerala-blue);color:#fff}.review-list{flex-direction:column;gap:12px;display:flex}.review-item{background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);border-left-width:4px;border-radius:10px;padding:14px 16px}.review-item.ok{border-left-color:var(--kerala-green)}.review-item.bad{border-left-color:var(--hard)}.review-q{margin-bottom:8px;font-weight:500;line-height:1.5}.review-num{color:var(--text-muted);font-weight:700}.review-ans{flex-wrap:wrap;gap:14px;margin-bottom:8px;font-size:14px;font-weight:600;display:flex}.review-correct{color:var(--kerala-green)}.review-wrong{color:var(--hard)}.review-explain{color:var(--text-muted);background:#f7f9fc;border-radius:8px;padding:10px 12px;font-size:14px;line-height:1.55}.review-explain strong{color:var(--kerala-blue)}.empty-state{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);text-align:center;color:var(--text-muted);box-shadow:var(--shadow);padding:36px;font-size:15px}.stat-grid{grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin-bottom:22px;display:grid}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);text-align:center;box-shadow:var(--shadow);padding:20px}.stat-value{color:var(--kerala-blue);font-size:30px;font-weight:800}.stat-label{color:var(--text-muted);margin-top:4px;font-size:13px}.insight-row{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin-bottom:8px;display:grid}.insight{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px 18px}.insight h4{margin:0 0 10px;font-size:14px}.tag-row{flex-wrap:wrap;gap:8px;display:flex}.tag{border-radius:20px;padding:4px 12px;font-size:13px;font-weight:600}.tag-strong{background:var(--correct-bg);color:var(--kerala-green)}.tag-weak{color:var(--medium);background:#fdf0e3}.section-title{color:var(--kerala-blue);margin:26px 0 12px;font-size:18px}.mastery-list{flex-direction:column;gap:14px;display:flex}.mastery-row{background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);border-radius:10px;padding:12px 16px}.mastery-head{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;margin-bottom:8px;display:flex}.mastery-name{font-size:15px;font-weight:600}.mastery-badge{color:#fff;background:var(--kerala-green);border-radius:20px;margin-left:6px;padding:2px 8px;font-size:11px;font-weight:700}.mastery-pct{color:var(--text-muted);font-size:13px;font-weight:600}.mastery-track{background:#eef2f7;border-radius:6px;height:8px;overflow:hidden}.mastery-fill{border-radius:6px;height:100%;transition:width .4s}.mastery-fill.hi{background:var(--kerala-green)}.mastery-fill.mid{background:var(--medium)}.mastery-fill.lo{background:var(--hard)}.trend-wrap{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px}.trend-chart{width:100%;height:auto;display:block}.trend-grid{stroke:var(--border);stroke-width:1px}.trend-axis{fill:var(--text-muted);font-size:11px}.trend-bar{fill:var(--blue-light);opacity:.18}.trend-area{fill:var(--blue-light);opacity:.12}.trend-line{stroke:var(--kerala-blue);stroke-width:2.5px;stroke-linejoin:round;stroke-linecap:round}.trend-dot{fill:var(--kerala-blue)}.trend-caption{color:var(--text-muted);margin:8px 2px 0;font-size:12px}.heatmap{grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:8px;display:grid}.heat-cell{color:#fff;border-radius:10px;flex-direction:column;justify-content:space-between;gap:4px;min-height:58px;padding:10px 12px;display:flex}.heat-cell.hi{background:var(--kerala-green)}.heat-cell.mid{background:var(--medium)}.heat-cell.lo{background:var(--hard)}.heat-name{font-size:12px;font-weight:600;line-height:1.2}.heat-score{align-self:flex-end;font-size:15px;font-weight:700}.tutor-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);margin-top:18px;padding:18px 20px}.tutor-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;display:flex}.tutor-title{color:var(--kerala-blue);font-size:15px;font-weight:700}.tutor-actions{gap:8px;display:flex}.tutor-chip{color:var(--kerala-blue);background:#eef4f9;border:1px solid #d6e3ee;border-radius:20px;padding:5px 14px;font-size:13px;font-weight:600;transition:background .15s}.tutor-chip:hover:not(:disabled){background:#dfeaf4}.tutor-chip:disabled{opacity:.5;cursor:not-allowed}.tutor-messages{flex-direction:column;gap:10px;max-height:340px;margin-top:14px;padding-right:4px;display:flex;overflow-y:auto}.tutor-msg{white-space:pre-wrap;border-radius:12px;max-width:90%;padding:11px 14px;font-size:14px;line-height:1.55}.tutor-msg.assistant{background:#f0f6ff;border:1px solid #dbe9f7;border-bottom-left-radius:4px;align-self:flex-start}.tutor-msg.user{background:var(--kerala-green);color:#fff;border-bottom-right-radius:4px;align-self:flex-end}.tutor-typing{align-items:center;gap:4px;display:flex}.tutor-typing span{background:var(--blue-light);border-radius:50%;width:7px;height:7px;animation:1s ease-in-out infinite tutor-bounce}.tutor-typing span:nth-child(2){animation-delay:.15s}.tutor-typing span:nth-child(3){animation-delay:.3s}@keyframes tutor-bounce{0%,80%,to{opacity:.5;transform:scale(.6)}40%{opacity:1;transform:scale(1)}}.tutor-error{background:var(--wrong-bg);border:1px solid var(--wrong-border);color:var(--hard);border-radius:8px;padding:10px 12px;font-size:13px}.tutor-ask{gap:8px;margin-top:14px;display:flex}.tutor-ask input{border:1.5px solid var(--border);border-radius:8px;flex:1;padding:10px 12px;font-family:inherit;font-size:14px}.tutor-ask input:focus{border-color:var(--kerala-green);outline:none}.label-row{justify-content:space-between;align-items:center;display:flex}.pw-toggle{color:var(--blue-light);background:0 0;border:none;border-radius:6px;padding:2px 6px;font-size:12px;font-weight:600}.pw-toggle:hover{color:var(--kerala-blue);background:#eef2f7}.written-controls{flex-wrap:wrap;align-items:center;gap:14px;margin:18px 0 4px;display:flex}.written-mode{flex:300px;max-width:420px;margin-bottom:0}.written-chapter{color:var(--text);border:1.5px solid var(--border);background:#fff;border-radius:10px;padding:9px 12px;font-weight:600}.written-chapter option{color:var(--text)}.written-list{flex-direction:column;gap:16px;margin-top:16px;display:flex}.written-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px 20px}.written-head{align-items:center;gap:10px;margin-bottom:10px;display:flex}.written-num{color:var(--kerala-blue);font-weight:800}.written-marks{color:var(--text-muted);background:#eef4fb;border-radius:999px;margin-left:auto;padding:3px 10px;font-size:12px;font-weight:700}.written-q{margin:0 0 12px;font-size:16px;font-weight:600;line-height:1.5}.written-input{border:1.5px solid var(--border);resize:vertical;box-sizing:border-box;border-radius:10px;width:100%;padding:12px;font-family:inherit;font-size:14px;line-height:1.5}.written-input:focus{border-color:var(--blue-light);outline:none}.written-actions{flex-wrap:wrap;gap:10px;margin-top:12px;display:flex}.written-result{border:1px solid var(--border);background:var(--bg);border-radius:10px;margin-top:14px;padding:14px 16px}.written-result.hi{background:var(--correct-bg);border-color:var(--correct-border)}.written-result.mid{border-color:var(--medium);background:#fdf6e9}.written-result.lo{background:var(--wrong-bg);border-color:var(--wrong-border)}.written-score{align-items:baseline;gap:10px;display:flex}.written-score-big{color:var(--text);font-size:26px;font-weight:800}.written-score-pct{color:var(--text-muted);font-size:14px;font-weight:700}.written-feedback{margin:8px 0 0;line-height:1.55}.written-points{margin:8px 0 0;font-size:13.5px;line-height:1.5}.written-points.ok{color:var(--kerala-green)}.written-points.miss{color:var(--medium)}.written-model{border-left:3px solid var(--kerala-green);background:#f3faf6;border-radius:0 8px 8px 0;margin-top:14px;padding:12px 16px}.written-model strong{text-transform:uppercase;letter-spacing:.04em;color:var(--kerala-green);margin-bottom:6px;font-size:13px;display:block}.written-model p{margin:0;line-height:1.6}.written-keypoints{margin:10px 0 0;padding-left:20px}.written-keypoints li{margin-bottom:4px;line-height:1.5}p.ai-note{color:var(--text-muted,#6b7280);margin:10px 0 0;font-size:12px;font-style:italic}.exam-portion{margin:14px 0 4px}.exam-portion-label{margin-bottom:6px;font-size:14px;font-weight:600;display:block}.exam-portion select{width:100%}.plan-quarters{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;display:grid}.plan-quarter{border:1px solid var(--border);background:#fff;border-radius:12px;padding:14px 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