: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{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{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,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 0;color:var(--primary);font-weight:600}.admin-login{min-height:100dvh;display:grid;place-items:center;padding:20px}.login-card{width:min(100%,380px);display:grid;gap:14px}.admin-page{width:min(1280px,100%);margin:0 auto;padding:24px 16px 40px}.metric-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-bottom:16px}.metric{min-height:96px;display:grid;gap:6px;align-content:center;background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:16px}.metric svg{color:var(--primary)}.metric span{color:var(--muted);font-size:14px}.metric strong{font-size:28px}.admin-tabs{display:flex;gap:8px;margin-bottom:16px;border-bottom:1px solid var(--line)}.tab{min-height:44px;border-radius:8px 8px 0 0;color:var(--muted);background:transparent;border:1px solid transparent;border-bottom:0}.tab.active{color:var(--primary);background:var(--surface);border-color:var(--line);font-weight:700}.toolbar{display:flex;flex-wrap:wrap;gap:10px;align-items:end;margin-bottom:16px}.toolbar .field{flex:1 1 220px}.toolbar .filter-date{flex-basis:190px;flex-grow:0}.toolbar .filter-status{flex-basis:150px;flex-grow:0}.toolbar .action-button{flex:0 0 auto;min-width:118px;white-space:nowrap}.student-editor{display:grid;grid-template-columns:repeat(3,minmax(180px,1fr));gap:12px;align-items:end}.editor-actions{display:flex;gap:8px}.editor-actions button{min-width:104px}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1000;display:grid;place-items:center;padding:24px;background:#0f172a73}.modal{width:min(760px,100%);max-height:calc(100dvh - 48px);overflow:hidden;display:grid;grid-template-rows:auto 1fr;background:var(--surface);border:1px solid var(--line);border-radius:8px;box-shadow:0 24px 70px #0f172a38}.modal-header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px;border-bottom:1px solid var(--line)}.modal-header h2{margin:0;font-size:20px}.modal-form{padding:18px;overflow:auto}.modal-actions{grid-column:1 / -1;justify-content:flex-end;padding-top:6px}.settings-panel{display:grid;gap:16px;max-width:680px;padding:18px;background:var(--surface);border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow)}.settings-panel h2{margin:0;font-size:20px}.settings-form{display:grid;grid-template-columns:repeat(2,minmax(180px,1fr)) auto;gap:12px;align-items:end}.file-button{position:relative;overflow:hidden;line-height:1}.file-button input{position:absolute;top:0;right:0;bottom:0;left:0;opacity:0;cursor:pointer}.table-wrap{overflow-x:auto;background:var(--surface);border:1px solid var(--line);border-radius:8px}table{width:100%;min-width:1100px;border-collapse:collapse}th,td{padding:12px 14px;border-bottom:1px solid var(--line);text-align:left;font-size:14px;vertical-align:middle}.row-actions{display:flex;gap:8px;min-width:168px}.icon-action{min-height:36px;padding:0 10px}th{color:var(--muted);background:#fbfcfe;font-weight:700}a{color:var(--primary);font-weight:700}.badge{display:inline-flex;align-items:center;min-height:28px;border-radius:999px;padding:0 10px;font-weight:700}.badge.done{background:#e8f7ef;color:#176448}.badge.missed{background:#fff0ee;color:var(--danger)}.empty-cell{height:96px;color:var(--muted);text-align:center}.pagination{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:14px;color:var(--muted)}.page-actions{display:flex;align-items:center;gap:8px}.page-actions select{width:auto}@media(max-width:760px){.admin-page{padding:18px 12px 32px}.metric-grid{grid-template-columns:1fr}.toolbar{display:grid;grid-template-columns:1fr}.admin-tabs{display:grid;grid-template-columns:1fr 1fr}.student-editor{grid-template-columns:1fr}.editor-actions{flex-direction:column}.modal-backdrop{align-items:end;padding:12px}.modal{max-height:calc(100dvh - 24px)}.modal-header,.modal-form{padding:14px}.settings-form{grid-template-columns:1fr}.toolbar .field,.toolbar .filter-date,.toolbar .filter-status,.toolbar .action-button{width:100%;min-width:0}.admin-header{align-items:flex-start}.pagination,.page-actions{align-items:stretch;flex-direction:column}.page-actions select{width:100%}}