:root{--ink:#172033;--muted:#667085;--line:#dfe5ee;--bg:#f5f7fb;--card:#fff;--blue:#2563eb;--blue-soft:#eaf1ff;--red:#dc2626;--red-soft:#fff0f0;--green:#0f766e;--shadow:0 12px 35px rgba(23,32,51,.08)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.topbar{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:24px max(24px,calc((100vw - 1400px)/2));background:#13213d;color:#fff}.topbar h1{margin:2px 0 0;font-size:26px}.eyebrow{font-size:11px;letter-spacing:.16em;opacity:.7}.account-box{display:flex;align-items:center;gap:12px;text-align:right}.container{max-width:1400px;margin:0 auto;padding:24px}.toolbar,.booking-panel,.student-panel,.guide{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px 20px;box-shadow:var(--shadow)}.toolbar{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:16px}.button{border:0;border-radius:9px;padding:10px 15px;font-weight:700;cursor:pointer;transition:.15s}.button:hover{transform:translateY(-1px)}.button.primary{background:var(--blue);color:#fff}.button.secondary{background:#eef2f7;color:var(--ink)}.button.danger{background:var(--red);color:#fff}.week-label{font-weight:800}.notice{padding:13px 16px;border-radius:10px;background:#fff4d5;color:#875d00;margin-bottom:16px}.student-panel{margin-bottom:16px}.student-grid{display:flex;flex-wrap:wrap;gap:20px}.student-basic{display:grid;gap:8px;margin-top:12px}.student-basic div{display:flex;gap:12px;padding:8px 0;border-bottom:1px solid var(--line)}.student-basic strong{width:32%}.student-basic span{font-weight:600}.student-table{width:100%;border-collapse:collapse;margin-top:12px}.student-table th,.student-table td{border:1px solid var(--line);padding:10px 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4px;font-size:18px}.panel-actions{display:flex;align-items:center;gap:8px}.selection-item{display:inline-flex;align-items:center;gap:8px;background:#eef4ff;border-radius:8px;padding:7px 10px;margin:5px 6px 0 0}.selection-item button{border:0;background:none;cursor:pointer}.choice-grid{display:grid;grid-template-columns:repeat(2,minmax(260px,1fr));gap:8px}.choice-item{display:flex;align-items:center;gap:8px;padding:8px 10px;border:1px solid var(--line);border-radius:8px}.choice-item select{margin-left:auto;padding:5px;border:1px solid var(--line);border-radius:6px}.guide{margin-top:16px;color:var(--muted)}.guide p{margin:5px 0}.modal{position:fixed;inset:0;background:rgba(15,23,42,.58);display:grid;place-items:center;padding:20px;z-index:10}.modal[hidden]{display:none}.modal-card{position:relative;width:min(100%,500px);background:#fff;border-radius:16px;padding:26px;box-shadow:0 25px 70px #0004}.modal-close{position:absolute;right:14px;top:10px;border:0;background:none;font-size:26px;cursor:pointer;color:var(--muted)}.modal-card h2{margin:0 0 18px}.modal-card form{display:grid;gap:14px}.modal-card label{display:grid;gap:6px;font-weight:700}.modal-card input,.modal-card select{width:100%;padding:10px 11px;border:1px solid var(--line);border-radius:8px;background:#fff;font:inherit}.form-error{white-space:pre-line;color:var(--red);min-height:0}.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:18px}.confirm-row{padding:9px 0;border-bottom:1px solid var(--line)}.modal-message{white-space:pre-line;margin-bottom:18px}@media(max-width:1050px){.calendar{overflow-x:auto;grid-template-columns:repeat(7,190px);padding-bottom:8px}.toolbar{align-items:flex-start;flex-direction:column}}@media(max-width:600px){.topbar{padding:18px;align-items:flex-start;flex-direction:column}.container{padding:14px}.account-box{text-align:left}.toolbar{padding:12px}.toolbar .button{padding:8px 9px;font-size:12px}.booking-panel{flex-direction:column}.panel-actions{justify-content:flex-end}}