:root{--ink:#182235;--muted:#68758a;--line:#dfe5ee;--surface:#fff;--bg:#f5f7fb;--blue:#356ae6;--blue-dark:#214ebd;--red:#e45d67;--yellow:#f3c94c;--shadow:0 12px 32px rgba(33,55,93,.08)}
*{box-sizing:border-box}html{background:var(--bg)}body{margin:0;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:15px;line-height:1.55}button,input,select,textarea{font:inherit}button{cursor:pointer}a{color:var(--blue)}
.shell{width:min(1120px,calc(100% - 28px));margin:0 auto;padding:22px 0 42px}.top{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:22px}.eyebrow{color:var(--blue);font-size:11px;font-weight:750;letter-spacing:.12em;text-transform:uppercase}.brand{font-size:22px;font-weight:760;letter-spacing:-.02em}.muted{color:var(--muted)}h1,h2{margin:4px 0 10px;line-height:1.2;letter-spacing:-.025em}h1{font-size:clamp(24px,4vw,36px)}h2{font-size:20px}.hero{padding:28px!important}.card{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:20px;box-shadow:var(--shadow)}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.form{display:grid;gap:13px}.field{display:grid;gap:5px}.field label{font-size:13px;font-weight:650;color:#44516a}input,select,textarea{width:100%;border:1px solid #cbd5e3;border-radius:10px;background:#fff;color:var(--ink);padding:10px 12px;outline:none}input:focus,select:focus,textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(53,106,230,.13)}textarea{min-height:100px;resize:vertical}.btn{border:0;border-radius:10px;padding:10px 15px;font-weight:700;transition:.15s transform,.15s background}.btn:active{transform:translateY(1px)}.btn.primary{background:var(--blue);color:#fff}.btn.primary:hover{background:var(--blue-dark)}.btn.secondary{background:#edf2fb;color:#294d9d}.tag{display:inline-block;border-radius:999px;background:#edf2fb;color:#294d9d;padding:3px 9px;font-size:12px;font-weight:700}.hidden{display:none!important}
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:12px}.data-table{width:100%;border-collapse:collapse;min-width:620px;background:#fff}.data-table th,.data-table td{padding:11px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle;white-space:nowrap}.data-table th{background:#f7f9fc;color:#556278;font-size:12px}.data-table tr:last-child td{border-bottom:0}.data-table tfoot td{font-weight:750;background:#fbfcfe}.seat-list{display:flex;flex-wrap:wrap;gap:8px}.seat-pill{border:1px solid var(--line);border-radius:10px;background:#fff;padding:9px 11px;color:var(--ink)}.seat-pill:hover{border-color:var(--blue);color:var(--blue)}
.seat-map{overflow:auto;border:1px solid var(--line);border-radius:14px;background:linear-gradient(180deg,#fbfcff,#f7f9fc);-webkit-overflow-scrolling:touch}.map-canvas{position:relative;min-width:320px;margin:0 auto}.seat{position:absolute;width:52px;height:42px;padding:2px 3px;border:1px solid #9bb5f3;border-radius:9px;background:#fff;color:#294d9d;font-size:11px;font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;box-shadow:0 3px 7px rgba(42,75,145,.08)}.seat:hover,.seat.selected{border-color:var(--blue);background:#eaf0ff}.seat.taken{border-color:var(--red);background:#ffe8ea;color:#b02f3b}.teacher-map .seat{width:52px}.podium{position:absolute;width:52px;height:31px;padding:4px 2px;border:1px solid #e3bb3d;border-radius:8px;background:#fff4c7;color:#886700;text-align:center;font-size:11px;font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.legend{display:flex;flex-wrap:wrap;gap:12px 18px;margin-top:13px;color:var(--muted);font-size:12px}.dot{display:inline-block;width:10px;height:10px;margin-right:5px;border:1px solid #9bb5f3;border-radius:50%;background:#fff;vertical-align:-1px}.dot.red{border-color:var(--red);background:#ffe8ea}.warning{margin:10px 0;padding:10px 12px;border-radius:10px;background:#fff8df;color:#886700;font-size:13px}.btn:disabled{cursor:not-allowed;opacity:.5;filter:grayscale(.25)}.success{text-align:center;padding:48px 20px}.bigcheck{display:grid;place-items:center;width:64px;height:64px;margin:0 auto 14px;border-radius:50%;background:#e4f7ec;color:#229653;font-size:36px;font-weight:800}.loading{text-align:center;padding:60px;color:var(--muted)}.site-footer{text-align:center;margin-top:22px}.teacher-entry{color:#aeb7c8;font-size:12px;text-decoration:none}.teacher-entry:hover{color:var(--blue);text-decoration:underline}.leave-proof{margin-top:6px;max-width:180px;font-size:11px;padding:5px}
@media(max-width:700px){.shell{width:min(100% - 20px,560px);padding-top:14px}.top{margin-bottom:14px}.brand{font-size:19px}.card{padding:15px;border-radius:14px}.hero{padding:20px!important}.grid{grid-template-columns:1fr;gap:12px}h1{font-size:27px}.data-table{min-width:560px}.map-canvas{margin-left:8px}.btn{min-height:42px}.seat{width:48px;height:40px}.podium{width:48px}}