:root{color-scheme:light;--bg: #f6f8fb;--surface: #ffffff;--text: #172033;--muted: #5f6b7a;--line: #dce3ec;--primary: #146c94;--primary-strong: #0f5574;--accent: #278a68;--warning: #a15c00;--danger: #b42318;--shadow: 0 10px 28px rgba(18, 32, 51, .08);font-family:Inter,Microsoft YaHei,PingFang SC,system-ui,sans-serif}*{box-sizing:border-box}body{margin:0;min-height:100dvh;background:var(--bg);color:var(--text)}button,input,select,textarea{font:inherit}button,.file-button{min-height:44px;border:0;border-radius:8px;padding:0 16px;display:inline-flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;transition:background .18s ease,transform .18s ease,opacity .18s ease}button:active,.file-button:active{transform:translateY(1px)}button:disabled{cursor:not-allowed;opacity:.55}input,select,textarea{min-height:44px;width:100%;border:1px solid var(--line);border-radius:8px;padding:10px 12px;color:var(--text);background:#fff}input:focus,select:focus,textarea:focus,button:focus-visible,a:focus-visible{outline:3px solid rgba(20,108,148,.25);outline-offset:2px}.phone-shell{width:min(100%,480px);min-height:100dvh;margin:0 auto;padding:20px 16px 32px}.topbar,.admin-header{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px}.topbar svg,.admin-header svg{color:var(--primary)}.eyebrow{margin:0 0 4px;color:var(--muted);font-size:13px}h1{margin:0;font-size:24px;line-height:1.25}.subheading{margin:6px 0 0;color:var(--muted);font-size:14px}.panel{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:18px;box-shadow:var(--shadow)}.stack{display:grid;gap:14px}.field{display:grid;gap:6px;color:var(--muted);font-size:14px}.field span{font-weight:600}.primary{color:#fff;background:var(--primary)}.primary:hover{background:var(--primary-strong)}.secondary{color:var(--primary);background:#e8f3f7}.danger{color:var(--danger);background:#fff0ee}.ghost{color:var(--muted);background:transparent;border:1px solid var(--line)}.student-card{display:grid;gap:5px;padding:14px;border:1px solid var(--line);border-radius:8px;background:#fafcff}.student-card strong{font-size:20px}.student-card span{color:var(--muted)}.status{min-height:48px;display:flex;align-items:center;gap:10px;padding:12px;border-radius:8px;font-weight:700}.status.ok{background:#e8f7ef;color:#176448}.status.ready{background:#e8f3f7;color:var(--primary)}.status.closed{background:#fff4e5;color:var(--warning)}.camera,.preview{width:100%;aspect-ratio:4 / 3;object-fit:cover;border-radius:8px;background:#0f172a}.hidden{display:none}.button-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px}.message{margin:14px 0 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