:root{--bg:#f5f7fb;--card:#fff;--text:#1f2937;--muted:#64748b;--line:#dce4ef;--blue:#2563eb;--blue2:#eff6ff;--green:#15803d;--red:#b91c1c;--shadow:0 5px 20px #0f172a06}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,p{margin-top:0}h1{font-size:26px;line-height:1.4;margin-bottom:12px}h2{font-size:18px;margin-bottom:16px}h3{font-size:16px}button,input,select,textarea{font:inherit}button{background:var(--blue);border:1px solid transparent;border-radius:8px;color:#fff;padding:9px 15px;cursor:pointer;font-weight:600;white-space:nowrap}button:hover{filter:brightness(.96)}button:disabled{opacity:.45;cursor:not-allowed}.light{background:var(--blue2);color:#1d4ed8;border-color:#dbeafe}.secondary{background:#475569}.danger{background:#fff1f2;color:var(--red);border-color:#fecdd3}input:not([type=checkbox]),select,textarea{border:1px solid var(--line);border-radius:7px;background:#fff;padding:9px 11px;max-width:100%;width:100%;min-width:0}input[type=checkbox]{width:18px;height:18px;accent-color:var(--blue)}input:focus,select:focus,textarea:focus,button:focus-visible,a:focus-visible{outline:3px solid #93c5fd;outline-offset:2px}label{display:grid;gap:5px;font-size:14px;color:#334155}textarea{min-height:110px;resize:vertical}.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:22px;box-shadow:var(--shadow);margin-bottom:18px}.muted,.footer-note{color:var(--muted)}.footer-note{font-size:13px;margin:16px 0}.eyebrow{font-size:12px;font-weight:700;letter-spacing:.08em;color:#64748b;margin-bottom:6px}.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.stack{display:grid;gap:16px}.form-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(145px,1fr));gap:12px;align-items:end}.grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.brand{display:block;font-size:21px;font-weight:750;color:#163569;letter-spacing:.03em}.brand span{display:block;font-size:12px;font-weight:400;color:var(--muted);letter-spacing:.12em}.admin-layout{display:grid;grid-template-columns:222px minmax(0,1fr);min-height:100vh}#sidebar{background:white;border-right:1px solid var(--line);padding:25px 16px;position:sticky;top:0;height:100vh;display:flex;flex-direction:column}#sidebar .brand{padding:0 12px 25px}nav{display:grid;gap:3px;overflow:auto}nav a{display:flex;align-items:center;gap:12px;color:#475569;padding:9px 12px;border-radius:7px}nav a:hover{text-decoration:none;background:#f8fafc}nav a.active{background:var(--blue2);color:#1d4ed8;font-weight:650}.nav-icon{font-size:13px;width:21px;color:#94a3b8}.sidebar-foot{margin-top:auto;padding:22px 12px 0;display:grid;gap:10px;font-size:12px;color:var(--muted);overflow-wrap:anywhere}.topbar{display:flex;justify-content:space-between;gap:20px;align-items:center;padding:23px 32px;background:#ffffffcc;border-bottom:1px solid var(--line)}.topbar h1{font-size:23px;margin:0}.period-select{display:flex;align-items:center;gap:10px}.period-select select{width:210px}.workspace main{padding:25px 32px;max-width:1550px;margin:auto}.metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px;margin-bottom:20px}.metric{padding:20px;background:#fff;border:1px solid var(--line);border-radius:10px}.metric strong{display:block;font-size:30px;line-height:1.4;margin:6px 0;color:#163569}.metric span{color:var(--muted);font-size:14px}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:8px}table{border-collapse:collapse;width:100%;font-size:14px;white-space:nowrap}td,th{padding:11px 12px;border-bottom:1px solid #e8edf4;text-align:left}th{background:#f8fafc;font-weight:600;color:#475569}tr:last-child td{border-bottom:0}td button{padding:5px 9px;font-size:13px;margin-right:4px}td.wrap{white-space:normal;min-width:180px;max-width:450px}.badge{display:inline-block;background:#eff6ff;color:#1d4ed8;padding:3px 9px;border-radius:20px;font-size:13px}.badge.ok{background:#dcfce7;color:#166534}.badge.warn{background:#fff7df;color:#92400e}.notice{padding:12px 15px;border-radius:8px;margin-bottom:18px;white-space:pre-wrap;overflow-wrap:anywhere}.notice.success{background:#e8f6ed;color:#166534;border:1px solid #bbdfc8}.notice.error{background:#fff1f2;color:#991b1b;border:1px solid #fecdd3}.empty{text-align:center;padding:36px 20px;color:var(--muted);background:#fff;border:1px dashed var(--line);border-radius:10px}.section-head{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:16px}.section-head h2{margin:0}.section-head p{margin:0}fieldset{border:1px solid var(--line);border-radius:10px;padding:16px;margin:18px 0}legend{font-weight:650;padding:0 6px}.time-option,.check-row{display:inline-flex;align-items:center;gap:9px;padding:9px 12px;border-radius:8px;border:1px solid var(--line);margin:4px;background:white;cursor:pointer}.time-option:has(input:checked){background:var(--blue2);border-color:#93c5fd;color:#1d4ed8}.teacher-page{max-width:700px;margin:35px auto;padding:0 20px}.teacher-page>.brand{margin-bottom:25px}.teacher-card{padding:30px}.teacher-card h1{font-size:28px}.teacher-card #instructions{margin-top:22px}.teacher-actions{display:flex;gap:12px;position:sticky;bottom:0;background:#fffc;padding-top:16px}.teacher-actions button:first-child{flex:1}.login-page{max-width:440px;margin:10vh auto;padding:20px}.login-page>.brand{margin-bottom:30px}.login-page h1{font-size:25px}.menu-button{display:none}dialog{border:1px solid var(--line);border-radius:12px;width:min(650px,calc(100vw - 30px));padding:25px;max-height:85vh;overflow:auto}dialog::backdrop{background:#0f172a66}dialog form{margin-top:20px}dialog input{margin:15px 0}.calendar-details{white-space:normal}#calendar{min-height:450px}.fc .fc-button-primary{background:var(--blue);border-color:var(--blue)}.fc .fc-toolbar-title{font-size:20px}.toolbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:16px}.toolbar select{width:auto;min-width:170px}progress{width:100%;height:12px;accent-color:var(--blue)}.warning{padding:12px;border-left:3px solid #f59e0b;background:#fffbeb;margin-bottom:18px}.list{padding-left:22px}.file-input{border:1px dashed #93c5fd!important;background:#f8fbff!important}.split{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(280px,1fr);gap:18px}[hidden]{display:none!important}@media(max-width:1050px){.metrics{grid-template-columns:repeat(2,1fr)}.grid,.split{grid-template-columns:1fr}.workspace main{padding:20px}.topbar{padding:18px 20px}}@media(max-width:760px){body{font-size:15px}.admin-layout{display:block}#sidebar{display:none;position:fixed;z-index:20;width:235px;box-shadow:4px 0 25px #0f172a33}#sidebar.open{display:flex}.menu-button{display:block}.topbar{gap:12px;flex-wrap:wrap}.topbar>.row{width:100%}.period-select{flex:1}.period-select select{width:100%}.workspace main{padding:16px}.card{padding:17px}.metrics{gap:9px}.metric{padding:15px}.metric strong{font-size:26px}.teacher-page{margin-top:22px;padding:0 12px}.teacher-card{padding:20px}.form-grid{grid-template-columns:1fr 1fr}.fc .fc-toolbar{flex-wrap:wrap;gap:10px}.fc .fc-toolbar-title{font-size:18px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

.date-picker{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:6px;max-width:650px;margin:16px 0 24px}.weekday{text-align:center;color:var(--muted);font-size:13px}.date-cell{position:relative;cursor:pointer}.date-cell input{position:absolute;opacity:0;width:100%;height:100%;margin:0;cursor:pointer}.date-cell>span{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:60px;border:1px solid var(--line);border-radius:8px}.date-cell small{font-size:10px;color:var(--muted)}.date-cell input:checked+span{background:var(--blue);color:white;border-color:var(--blue)}.date-cell input:checked+span small{color:white}.date-cell input:focus-visible+span{outline:3px solid #93c5fd;outline-offset:2px}summary{cursor:pointer;font-weight:650}details[open]>summary{margin-bottom:18px}#time-ranges{margin-bottom:16px}@media(max-width:760px){.date-picker{gap:3px}.date-cell>span{min-height:48px}.time-range{grid-template-columns:1fr 1fr}.time-range button{grid-column:1/-1}}

.leader-dates{display:grid;grid-template-columns:repeat(auto-fill,minmax(145px,1fr));gap:8px;margin:16px 0 20px}.leader-dates .time-option{margin:0}.leader-dates small{color:var(--muted)}#calendar .fc-daygrid-event{white-space:normal}#calendar .fc-event-title{white-space:pre-wrap;overflow-wrap:anywhere;font-weight:500}#calendar .fc-event-main{padding:4px 5px}#calendar .fc-daygrid-day-events{margin-bottom:8px}