:root{--bg: #f4f5fb;--surface: #ffffff;--ink: #1e293b;--muted: #64748b;--line: #e2e8f0;--primary: #6366f1;--primary-dark: #4f46e5;--primary-soft: #eef2ff;--accent: #f59e0b;--success: #10b981;--danger: #ef4444;--dark: #171a3a;--radius: 14px;--radius-sm: 10px;--shadow: 0 1px 2px rgba(15, 23, 42, .05), 0 8px 24px -12px rgba(15, 23, 42, .18);--font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--tabbar-h: 60px;--appbar-h: 56px;--safe-top: env(safe-area-inset-top, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;font-size:15px;line-height:1.5}h1,h2,h3{margin:0 0 8px;line-height:1.25;letter-spacing:-.01em}h1{font-size:24px}h2{font-size:18px}h3{font-size:16px}p{margin:0 0 10px}a{color:var(--primary)}.muted{color:var(--muted)}.small{font-size:12.5px}.error{color:#b91c1c;background:#fef2f2;border:1px solid #fecaca;border-radius:var(--radius-sm);padding:10px 14px;margin:10px 0}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 18px;border:1px solid transparent;border-radius:var(--radius-sm);background:linear-gradient(180deg,var(--primary),var(--primary-dark));color:#fff;font:600 14px/1.2 var(--font);cursor:pointer;transition:transform .06s ease,box-shadow .15s ease,background .15s ease;box-shadow:0 1px 2px #4f46e559;min-height:42px;-webkit-tap-highlight-color:transparent}.btn:active{transform:scale(.98)}.btn:disabled{opacity:.6;cursor:wait;transform:none}.btn.ghost{background:transparent;color:var(--primary);border-color:var(--line);box-shadow:none}.btn.ghost:hover{background:var(--primary-soft)}.btn.small{padding:8px 12px;font-size:13px;min-height:36px}.btn.danger{background:#fff;color:var(--danger);border-color:#fecaca;box-shadow:none}.btn.danger:hover{background:#fef2f2}.login{min-height:100dvh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px 24px calc(32px + var(--safe-bottom));text-align:center;background:radial-gradient(80% 60% at 80% 0%,rgba(99,102,241,.18),transparent 60%),radial-gradient(70% 50% at 10% 100%,rgba(245,158,11,.12),transparent 60%),var(--dark)}.login-logo{width:76px;height:76px;border-radius:22px;display:grid;place-items:center;font-weight:800;font-size:34px;color:#fff;background:linear-gradient(135deg,var(--primary),#8b5cf6);box-shadow:0 12px 30px -6px #6366f199;margin-bottom:20px}.login h1{color:#fff;font-size:28px;margin-bottom:6px}.login .tagline{color:#c7cbe8;max-width:34ch;margin-bottom:26px}.login .tagline strong{color:#fff}.login .gsi{min-height:44px;width:100%;max-width:320px}.login .error{width:100%;max-width:320px}.login-features{display:grid;gap:10px;margin-top:30px;width:100%;max-width:320px}.login-features div{display:flex;align-items:baseline;gap:12px;background:#ffffff0f;border:1px solid rgba(255,255,255,.1);border-radius:var(--radius-sm);padding:12px 16px;text-align:left}.login-features span{text-transform:uppercase;font-size:10.5px;letter-spacing:.1em;color:#a5b4fc;min-width:50px}.login-features strong{color:#fff;font-weight:600;font-size:13.5px}.app{display:flex;flex-direction:column;height:100dvh;max-width:480px;margin:0 auto;background:var(--bg);box-shadow:0 0 0 1px var(--line),0 0 60px #0f172a1f;overflow:hidden}@media(max-width:520px){.app{max-width:none;box-shadow:none}}.app-bar{flex-shrink:0;height:calc(var(--appbar-h) + var(--safe-top));padding:var(--safe-top) 14px 0;display:flex;align-items:center;justify-content:space-between;background:var(--dark);color:#fff;border-bottom:1px solid rgba(255,255,255,.06);z-index:20}.app-bar-brand{display:flex;align-items:center;gap:10px}.app-logo{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;font-weight:800;font-size:16px;color:#fff;background:linear-gradient(135deg,var(--primary),#8b5cf6)}.app-bar-brand strong{display:block;font-size:14.5px;line-height:1.2}.app-bar-brand span{display:block;font-size:11px;color:#a5b4fc;line-height:1.2}.app-bar-btn{width:38px;height:38px;border:0;border-radius:10px;background:#ffffff14;color:#c7cbe8;display:grid;place-items:center;cursor:pointer;-webkit-tap-highlight-color:transparent}.app-bar-btn:active{background:#ffffff29}.screen{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain;padding:16px 16px 24px}.tab-bar{flex-shrink:0;height:calc(var(--tabbar-h) + var(--safe-bottom));padding-bottom:var(--safe-bottom);display:flex;background:var(--surface);border-top:1px solid var(--line);z-index:20}.tab{flex:1;border:0;background:none;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;cursor:pointer;color:var(--muted);font-family:var(--font);-webkit-tap-highlight-color:transparent;transition:color .12s ease}.tab-ico{width:40px;height:30px;border-radius:999px;display:grid;place-items:center;transition:background .15s ease,color .15s ease}.tab.active{color:var(--primary-dark);font-weight:600}.tab.active .tab-ico{background:var(--primary-soft)}.tab-label{font-size:10.5px;letter-spacing:.01em}.page-hero{margin-bottom:18px}.page-hero h1{font-size:22px;margin-bottom:4px}.hero-copy{color:var(--muted);margin:0;font-size:13.5px}.stats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:20px}.stat-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px 16px;display:flex;flex-direction:column;gap:2px;font:inherit;color:inherit;text-align:left}button.stat-card{cursor:pointer}button.stat-card:active{transform:scale(.97);border-color:var(--primary)}.stat-card span{color:var(--muted);font-size:12px;font-weight:600}.stat-card strong{font-size:26px;letter-spacing:-.02em}.stat-card small{color:var(--muted);font-size:11.5px}.action-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:22px}.action-card{text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px 16px;cursor:pointer;display:flex;flex-direction:column;gap:4px;font-family:var(--font);transition:border-color .15s ease,transform .1s ease;-webkit-tap-highlight-color:transparent}.action-card:active{transform:scale(.98);border-color:#c7d2fe}.action-card strong{font-size:14px}.action-card span{color:var(--muted);font-size:12px}.dashboard-grid{display:grid;gap:16px;align-items:start}.student-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.student-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px 12px;display:flex;flex-direction:column;align-items:center;gap:6px;text-align:center;font:inherit;color:inherit;cursor:pointer;min-height:96px;transition:transform .1s ease,border-color .1s ease}.student-card:active{transform:scale(.98);border-color:var(--primary)}.student-card strong{font-size:15px}.card-pts{font-size:14px;font-weight:700;color:var(--primary-dark)}.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px}.panel.wide{min-width:0}.panel h2{margin-bottom:12px}.section-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.section-head h2{margin:0}.section-head p{margin:2px 0 0}.table{width:100%;border-collapse:collapse;font-size:13.5px}.table th{text-align:left;font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);padding:8px;border-bottom:1px solid var(--line)}.table td{padding:10px 8px;border-bottom:1px solid #eef1f6}.table tbody tr:last-child td{border-bottom:0}.badge{display:inline-block;padding:4px 10px;border-radius:999px;font-size:11px;font-weight:700;background:var(--primary-soft);color:var(--primary-dark);text-transform:capitalize;white-space:nowrap}.metric-list{list-style:none;margin:0;padding:0;display:grid;gap:10px}.metric-list li{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;border:1px solid var(--line);border-radius:var(--radius-sm);background:#fbfcff}.metric-list li strong{color:var(--primary-dark)}.empty-state{margin-top:10px;background:var(--surface);border:1px dashed #cbd5e1;border-radius:var(--radius);padding:32px 20px;text-align:center}.empty-state h2{margin-bottom:6px}.empty-state .actions{justify-content:center;margin-top:14px}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;margin-bottom:14px}.list{list-style:none;margin:0;padding:0;display:grid;gap:10px}.list-item{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:13px 14px}.list-item>div:first-child{min-width:0}.actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.list-open{flex:1;min-width:0;text-align:left;background:none;border:0;padding:0;font:inherit;color:inherit;cursor:pointer}.back-btn{margin-bottom:10px}.profile-card{display:grid;gap:14px}.profile-head{display:flex;align-items:center;gap:12px}.profile-head h2{margin:0}.avatar{width:46px;height:46px;border-radius:50%;display:grid;place-items:center;background:var(--primary);color:#fff;font-weight:700;font-size:20px;flex-shrink:0}.avatar-photo{object-fit:cover;display:block;border:2px solid var(--line)}.detail-rows{display:grid;gap:8px}.detail-row{display:grid;grid-template-columns:110px 1fr;gap:10px;font-size:14px}.detail-label{color:var(--muted);font-weight:600}.box-title{margin:20px 0 4px;font-size:15px;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}.pos{color:var(--ok, #16a34a)}.neg{color:var(--danger, #dc2626)}.row-form{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.row-form input,.row-form select{flex:1;min-width:130px}.grid-form{display:grid;grid-template-columns:1fr;gap:12px;align-items:end}.grid-form label,.grid-form .field{display:flex;flex-direction:column;gap:6px;font-size:12.5px;font-weight:600;color:var(--muted)}.grid-form button{justify-self:start}.day-chips{display:flex;flex-wrap:wrap;gap:8px}.chip{padding:8px 14px;border:1px solid var(--line);border-radius:999px;background:#fbfcff;color:var(--muted);font:600 12.5px/1 var(--font);cursor:pointer;-webkit-tap-highlight-color:transparent;transition:background .12s ease,color .12s ease,border-color .12s ease}.chip.active{background:var(--primary-soft);border-color:var(--primary);color:var(--primary-dark)}.list-item.editing{border-color:var(--primary)}input,select,textarea{font:400 15px/1.4 var(--font);color:var(--ink);padding:10px 12px;border:1px solid var(--line);border-radius:var(--radius-sm);background:#fbfcff;outline:none;transition:border-color .12s ease,box-shadow .12s ease;width:100%;-webkit-appearance:none;-moz-appearance:none;appearance:none}input:focus,select:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px #6366f126;background:#fff}input[type=color]{padding:4px;height:42px}section h2{margin-top:4px;margin-bottom:12px}section .card+h2{margin-top:24px}.assignment{display:grid;gap:14px}.assignment h3{margin:0}.q{border-top:1px solid var(--line);padding-top:14px}.q p{margin:0 0 8px}.choices{list-style:none;margin:0;padding:0;display:grid;gap:6px}.choices li{padding:10px 12px;border:1px solid var(--line);border-radius:var(--radius-sm);background:#fbfcff;font-size:14px}.choices li.answer{border-color:#a7f3d0;background:#ecfdf5;font-weight:600}.choices li.answer:after{content:" ✓";color:var(--success)}body.native{overscroll-behavior:none;-webkit-tap-highlight-color:transparent}.segment{display:flex;gap:4px;padding:4px;background:#eef1f8;border-radius:var(--radius-sm);margin-bottom:16px}.segment button{flex:1;padding:10px 8px;border:none;border-radius:calc(var(--radius-sm) - 2px);background:transparent;color:var(--muted);font:600 14px/1 var(--font);cursor:pointer;transition:background .12s ease,color .12s ease}.segment button.active{background:#fff;color:var(--primary-dark);box-shadow:0 1px 3px #0f172a14}.icon-row{display:flex;align-items:center;gap:12px;min-width:0}.big-icon{font-size:28px;line-height:1;flex-shrink:0;width:44px;height:44px;display:flex;align-items:center;justify-content:center;background:var(--primary-soft, #eef2ff);border-radius:10px}.item-meta{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:10px}.badge.done{background:#ecfdf5;color:#047857}.impersonate-bar{flex-shrink:0;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:8px 14px;background:#fef3c7;border-bottom:1px solid #fde68a;color:#92400e;z-index:30}.impersonate-bar strong{display:block;font-size:13px;line-height:1.3}.impersonate-bar span{display:block;font-size:11.5px;color:#a16207;line-height:1.3}.impersonate-bar .btn{flex-shrink:0;min-height:34px;padding:7px 14px;background:#92400e;box-shadow:none}.badge.admin-chip{background:#fef3c7;color:#92400e;text-transform:none}