:root{--bg-dark:#0D0E1A;--bg-card:#1A1B2E;--bg-elevated:#252640;--ink:#ffffff;--muted:#8B8CA0;--text-muted:#5A5B6E;--line:rgba(255,255,255,0.08);--panel:rgba(26,27,46,0.88);--panel-strong:rgba(37,38,64,0.92);--cyan:#00D4AA;--magenta:#FF3CAC;--purple:#784BA0;--blue:#2B86C5;--orange:#FF6B35;--accent:#00D4AA;--accent-strong:#00b892;--success:#00D4AA;--warn:#F59E0B;--danger:#EF4444;--shadow:0 24px 70px rgba(0,0,0,0.32);--sidebar-width:240px}*{box-sizing:border-box}html{min-height:100%}body{margin:0;min-height:100vh;color:var(--ink);background:var(--bg-dark);font-family:Inter,Avenir Next,Segoe UI,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button{cursor:pointer}.auth-page{min-height:100vh;display:grid;place-items:center;background:radial-gradient(circle at top left,rgba(0,212,170,.08),transparent 32%),radial-gradient(circle at bottom right,rgba(255,60,172,.06),transparent 28%),linear-gradient(180deg,var(--bg-dark),#121328)}.auth-card{width:min(420px,calc(100vw - 32px));padding:36px;border:1px solid var(--line);border-radius:28px;background:var(--panel);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);box-shadow:var(--shadow)}.auth-card h1{margin:0 0 6px;font-size:1.8rem;font-weight:700;background:linear-gradient(135deg,var(--cyan),var(--magenta),var(--purple));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.auth-card .subtitle{margin:0 0 28px;color:var(--muted);font-size:.95rem}.auth-card .field{display:grid;grid-gap:8px;gap:8px;margin-bottom:16px}.auth-card label{font-size:.88rem;font-weight:600;color:var(--muted)}.auth-card input{width:100%;border:1px solid rgba(255,255,255,.12);border-radius:14px;padding:13px 16px;background:var(--bg-elevated);color:var(--ink);font-size:.95rem}.auth-card input::placeholder{color:var(--text-muted)}.auth-card input:focus{outline:2px solid rgba(0,212,170,.5);outline-offset:2px}.primary-btn{width:100%;border:0;border-radius:999px;padding:14px 18px;background:linear-gradient(135deg,var(--cyan),var(--accent-strong));color:var(--bg-dark);font-weight:700;font-size:.95rem;transition:transform .14s ease,opacity .14s ease}.primary-btn:hover{transform:translateY(-1px)}.primary-btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.divider-label{text-align:center;color:var(--text-muted);font-size:.82rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;position:relative;padding:6px 0;margin:8px 0}.divider-label:after,.divider-label:before{content:"";position:absolute;top:50%;width:calc(50% - 50px);height:1px;background:var(--line)}.divider-label:before{left:0}.divider-label:after{right:0}.demo-grid{display:grid;grid-gap:10px;gap:10px;grid-template-columns:1fr 1fr}.demo-btn{border:1px solid rgba(0,212,170,.25);border-radius:14px;padding:13px 16px;background:linear-gradient(135deg,rgba(0,212,170,.1),rgba(120,75,160,.1));color:var(--cyan);font-weight:700;font-size:.88rem;transition:transform .14s ease,border-color .14s ease,background .14s ease}.demo-btn:hover{transform:translateY(-1px);border-color:var(--cyan);background:linear-gradient(135deg,rgba(0,212,170,.18),rgba(120,75,160,.15))}.demo-btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.auth-error{margin:12px 0 0;padding:12px 16px;border-radius:14px;background:rgba(239,68,68,.12);color:var(--danger);font-size:.88rem}.dashboard-shell{display:flex;min-height:100vh}.sidebar{position:fixed;top:0;left:0;bottom:0;width:var(--sidebar-width);display:flex;flex-direction:column;padding:24px 16px;background:var(--bg-card);border-right:1px solid var(--line);z-index:100;transition:transform .2s ease}.sidebar-brand{margin:0 0 32px;font-size:1.2rem;font-weight:700;background:linear-gradient(135deg,var(--cyan),var(--purple));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.sidebar-nav{display:flex;flex-direction:column;gap:4px;flex:1 1}.nav-link{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:12px;font-size:.92rem;font-weight:500;color:var(--muted);transition:background .14s ease,color .14s ease}.nav-link:hover{background:var(--bg-elevated);color:var(--ink)}.nav-link.active{background:rgba(0,212,170,.12);color:var(--cyan);font-weight:600}.nav-link .nav-icon{font-size:1.1rem;width:20px;text-align:center}.sidebar-bottom{margin-top:auto;padding-top:16px;border-top:1px solid var(--line)}.sidebar-email{display:block;margin-bottom:12px;color:var(--muted);font-size:.82rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.signout-btn{width:100%;border:1px solid rgba(239,68,68,.25);border-radius:12px;padding:10px;background:rgba(239,68,68,.08);color:var(--danger);font-weight:600;font-size:.88rem;transition:background .14s ease}.signout-btn:hover{background:rgba(239,68,68,.18)}.main-content{flex:1 1;margin-left:var(--sidebar-width);padding:28px 32px;min-width:0}.main-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:28px}.main-header h1{margin:0;font-size:1.5rem;font-weight:700;color:var(--ink)}.hamburger{border:1px solid var(--line);border-radius:10px;padding:8px 10px;background:var(--bg-elevated);color:var(--ink);font-size:1.2rem}.hamburger,.sidebar-overlay{display:none}.stat-grid{display:grid;grid-gap:16px;gap:16px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));margin-bottom:28px}.stat-card{padding:22px;border:1px solid var(--line);border-radius:20px;background:var(--bg-card)}.stat-card .stat-label{display:block;margin-bottom:8px;color:var(--muted);font-size:.84rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em}.stat-card .stat-value{font-size:1.8rem;font-weight:700;color:var(--ink)}.stat-card .stat-value.cyan{color:var(--cyan)}.stat-card .stat-value.purple{color:var(--purple)}.stat-card .stat-value.orange{color:var(--orange)}.chart-card{padding:24px;border:1px solid var(--line);border-radius:20px;background:var(--bg-card);margin-bottom:28px}.chart-card h2{margin:0 0 20px;font-size:1.05rem;font-weight:600;color:var(--ink)}.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.section-header h2{margin:0;font-size:1.1rem;font-weight:600;color:var(--ink)}.session-list{display:grid;grid-gap:12px;gap:12px;margin-bottom:28px}.session-card{display:flex;align-items:center;gap:16px;padding:18px 20px;border:1px solid var(--line);border-radius:16px;background:var(--bg-card);transition:border-color .14s ease,transform .14s ease}.session-card:hover{border-color:rgba(0,212,170,.3);transform:translateY(-1px)}.session-card .session-info{flex:1 1;min-width:0}.session-card .session-student{font-weight:600;font-size:.96rem;color:var(--ink)}.session-card .session-meta{display:flex;gap:16px;margin-top:4px;font-size:.84rem;color:var(--muted)}.session-card .engagement-badge{display:flex;align-items:center;justify-content:center;min-width:52px;height:52px;border-radius:14px;font-weight:700;font-size:1rem}.engagement-badge.high{background:rgba(0,212,170,.12);color:var(--cyan)}.engagement-badge.mid{background:rgba(245,158,11,.12);color:var(--warn)}.engagement-badge.low{background:rgba(239,68,68,.12);color:var(--danger)}.students-grid{display:grid;grid-gap:12px;gap:12px}.student-row{display:flex;align-items:center;gap:16px;padding:18px 20px;border:1px solid var(--line);border-radius:16px;background:var(--bg-card);transition:border-color .14s ease,transform .14s ease}.student-row:hover{border-color:rgba(0,212,170,.3);transform:translateY(-1px)}.student-avatar{display:flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg,rgba(0,212,170,.2),rgba(120,75,160,.2));color:var(--cyan);font-weight:700;font-size:1rem}.student-info{flex:1 1;min-width:0}.student-name{font-weight:600;font-size:.96rem;color:var(--ink)}.student-meta{display:flex;gap:16px;margin-top:4px;font-size:.84rem;color:var(--muted)}.detail-header{display:flex;align-items:center;gap:20px;margin-bottom:28px;flex-wrap:wrap}.detail-header h1{flex:1 1;min-width:0}.back-link{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border-radius:10px;background:var(--bg-elevated);border:1px solid var(--line);color:var(--muted);font-size:.88rem;font-weight:600;transition:color .14s ease}.back-link:hover{color:var(--ink)}.detail-score{display:flex;align-items:center;justify-content:center;width:72px;height:72px;border-radius:18px;font-size:1.5rem;font-weight:700;flex-shrink:0}.metrics-table{width:100%;border-collapse:separate;border-spacing:0;margin-bottom:28px;border:1px solid var(--line);border-radius:16px;overflow:hidden}.metrics-table td,.metrics-table th{padding:14px 18px;text-align:left;font-size:.9rem}.metrics-table th{background:var(--bg-elevated);color:var(--muted);font-weight:600;font-size:.82rem;text-transform:uppercase;letter-spacing:.06em}.metrics-table td{background:var(--bg-card);border-top:1px solid var(--line);color:var(--ink)}.metrics-table tr:last-child td:first-child{border-bottom-left-radius:16px}.metrics-table tr:last-child td:last-child{border-bottom-right-radius:16px}.moment-list,.nudge-list,.rec-list{display:grid;grid-gap:10px;gap:10px;margin-bottom:28px}.moment-item,.nudge-item{padding:16px 18px;border:1px solid var(--line);border-radius:14px;background:var(--bg-card)}.moment-item .moment-type,.nudge-item .nudge-type{display:inline-block;margin-bottom:6px;padding:4px 10px;border-radius:8px;font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;background:rgba(0,212,170,.12);color:var(--cyan)}.nudge-item .nudge-type.high{background:rgba(239,68,68,.12);color:var(--danger)}.nudge-item .nudge-type.medium{background:rgba(245,158,11,.12);color:var(--warn)}.moment-item .moment-desc,.nudge-item .nudge-msg{font-size:.92rem;color:var(--ink);line-height:1.5}.moment-item .moment-time,.nudge-item .nudge-time{margin-top:6px;font-size:.82rem;color:var(--text-muted)}.rec-item{display:flex;align-items:flex-start;gap:10px;padding:14px 16px;border:1px solid var(--line);border-radius:14px;background:var(--bg-card);font-size:.92rem;color:var(--ink);line-height:1.5}.rec-bullet{color:var(--cyan);font-weight:700;flex-shrink:0}.empty-state{text-align:center;padding:48px 20px;color:var(--muted)}.empty-state .empty-icon{font-size:2.4rem;margin-bottom:12px}.loading{display:flex;align-items:center;justify-content:center;min-height:200px;color:var(--muted);font-size:.95rem}@media (max-width:768px){.sidebar{transform:translateX(-100%)}.sidebar.open{transform:translateX(0)}.sidebar-overlay{display:none}.sidebar-overlay.open{display:block;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:90}.main-content{margin-left:0;padding:20px 16px}.hamburger{display:block}.stat-grid{grid-template-columns:1fr 1fr}.demo-grid{grid-template-columns:1fr}}@media (max-width:480px){.stat-grid{grid-template-columns:1fr}}