:root{
  --bg:#f5f7fb; --panel:#ffffff; --panel-2:#f9fbff; --line:#e2e8f4; --line-strong:#cbd5e8;
  --text:#1b2434; --muted:#6b7891; --brand:#2f6fed; --brand-soft:#eaf1ff;
  --ok:#12855f; --ok-soft:#e5f6ef; --warn:#b7791f; --warn-soft:#fdf3e0; --danger:#c53434; --danger-soft:#fdecec;
  --shadow:0 1px 2px rgba(20,30,50,.06),0 8px 24px rgba(20,30,50,.06);
  --radius:12px;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--text);
  font-family:"Noto Sans TC","PingFang TC","Microsoft JhengHei",system-ui,-apple-system,sans-serif;font-size:14px;line-height:1.6}
a{color:var(--brand);text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}

/* layout */
.app{display:grid;grid-template-columns:220px 1fr;min-height:100vh}
.sidebar{background:#111a2e;color:#c6d0e2;padding:16px 12px;display:flex;flex-direction:column;gap:2px;position:sticky;top:0;height:100vh;overflow-y:auto}
.brand{display:flex;align-items:center;gap:8px;color:#fff;font-weight:700;font-size:16px;padding:6px 10px 14px}
.brand .dot{width:10px;height:10px;border-radius:50%;background:var(--brand)}
.navgroup{font-size:11px;letter-spacing:.08em;color:#6d7c99;padding:14px 10px 6px;text-transform:uppercase}
.navlink{display:flex;align-items:center;gap:9px;padding:8px 10px;border-radius:9px;color:#c6d0e2;cursor:pointer;font-size:13.5px}
.navlink:hover{background:#1b2743;color:#fff}
.navlink.active{background:var(--brand);color:#fff;font-weight:600}
.navlink .ic{width:18px;text-align:center;opacity:.9}
.sidebar .who{margin-top:auto;border-top:1px solid #23304d;padding-top:12px;font-size:12px;color:#8a97b1}
.main{padding:22px 26px 60px;max-width:1500px;width:100%}
.pagehead{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:18px;flex-wrap:wrap}
.pagehead h1{margin:0;font-size:22px}
.pagehead p{margin:4px 0 0;color:var(--muted);font-size:13px}

/* components */
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;margin-bottom:16px}
.card h3{margin:0 0 12px;font-size:15px;display:flex;align-items:center;gap:8px;justify-content:space-between}
.card h3 span.t{display:flex;align-items:center;gap:8px}
.grid{display:grid;gap:14px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.g3{grid-template-columns:repeat(3,minmax(0,1fr))}
.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media(max-width:1100px){.g3,.g4{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.app{grid-template-columns:1fr}.sidebar{position:static;height:auto}.g2,.g3,.g4{grid-template-columns:1fr}}

.kpi{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;box-shadow:var(--shadow)}
.kpi .label{color:var(--muted);font-size:12px}
.kpi .value{font-size:24px;font-weight:700;margin-top:4px;letter-spacing:-.02em}
.kpi .sub{font-size:12px;color:var(--muted);margin-top:2px}
.kpi.good .value{color:var(--ok)} .kpi.bad .value{color:var(--danger)}

table{width:100%;border-collapse:collapse}
th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);font-size:13px;vertical-align:middle}
th{color:var(--muted);font-weight:600;font-size:12px;background:var(--panel-2);position:sticky;top:0}
tbody tr:hover{background:#fafcff}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums}
.tablewrap{overflow:auto;max-height:70vh;border:1px solid var(--line);border-radius:10px}

.btn{display:inline-flex;align-items:center;gap:6px;background:var(--brand);color:#fff;border:0;border-radius:9px;
  padding:8px 14px;cursor:pointer;font-size:13px;font-weight:600}
.btn:hover{filter:brightness(1.07)}
.btn.ghost{background:#fff;color:var(--text);border:1px solid var(--line-strong)}
.btn.ghost:hover{background:#f3f6fc}
.btn.sm{padding:5px 10px;font-size:12px;border-radius:7px}
.btn.danger{background:var(--danger)}
.btn.ok{background:var(--ok)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btnrow{display:flex;gap:8px;flex-wrap:wrap;align-items:center}

label.f{display:block;font-size:12px;color:var(--muted);margin-bottom:4px}
input,select,textarea{width:100%;background:#fff;border:1px solid var(--line-strong);border-radius:9px;padding:8px 10px;font-size:13px}
input:focus,select:focus,textarea:focus{outline:2px solid var(--brand-soft);border-color:var(--brand)}
textarea{min-height:90px;resize:vertical}
.field{margin-bottom:12px}
.inline{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.check{display:flex;align-items:center;gap:6px;font-size:13px}
.check input{width:auto}

.badge{display:inline-block;padding:2px 9px;border-radius:20px;font-size:11.5px;font-weight:600;background:var(--brand-soft);color:var(--brand)}
.badge.ok{background:var(--ok-soft);color:var(--ok)}
.badge.warn{background:var(--warn-soft);color:var(--warn)}
.badge.danger{background:var(--danger-soft);color:var(--danger)}
.badge.gray{background:#eef1f6;color:var(--muted)}
.muted{color:var(--muted)}
.small{font-size:12px}
.right{text-align:right}
.empty{padding:26px;text-align:center;color:var(--muted)}

.alert{padding:10px 12px;border-radius:9px;font-size:13px;margin-bottom:8px;border-left:4px solid}
.alert.error{background:var(--danger-soft);border-color:var(--danger);color:#8f2222}
.alert.warn{background:var(--warn-soft);border-color:var(--warn);color:#7d5310}
.alert.info{background:var(--brand-soft);border-color:var(--brand);color:#1e4fb0}
.alert.ok{background:var(--ok-soft);border-color:var(--ok);color:#0c6448}

/* modal */
.modal-bg{position:fixed;inset:0;background:rgba(15,23,42,.45);display:flex;align-items:flex-start;justify-content:center;
  padding:40px 16px;z-index:60;overflow:auto}
.modal{background:#fff;border-radius:14px;box-shadow:0 20px 60px rgba(0,0,0,.25);width:min(880px,100%);padding:20px}
.modal.wide{width:min(1180px,100%)}
.modal h2{margin:0 0 14px;font-size:18px}
.modal-foot{display:flex;justify-content:flex-end;gap:8px;margin-top:16px;border-top:1px solid var(--line);padding-top:14px}

/* toast */
#toasts{position:fixed;right:18px;bottom:18px;display:flex;flex-direction:column;gap:8px;z-index:90}
.toast{background:#111a2e;color:#fff;padding:10px 14px;border-radius:9px;font-size:13px;box-shadow:var(--shadow);max-width:380px}
.toast.err{background:#8f2222}.toast.ok{background:#0c6448}

/* login */
.login-wrap{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(140deg,#111a2e,#22335c)}
.login{background:#fff;padding:30px;border-radius:16px;width:min(400px,92vw);box-shadow:0 30px 70px rgba(0,0,0,.3)}
.login h1{margin:0 0 4px;font-size:20px}
.login p.sub{margin:0 0 20px;color:var(--muted);font-size:13px}

/* availability grid */
.avail{display:grid;grid-template-columns:64px repeat(7,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:8px;overflow:hidden;user-select:none}
.avail .hd{background:var(--panel-2);padding:6px;text-align:center;font-size:12px;font-weight:600}
.avail .tl{background:var(--panel-2);font-size:11px;color:var(--muted);padding:0 4px;text-align:right;line-height:14px}
.avail .cell{background:#fff;height:14px;cursor:crosshair}
.avail .cell.on{background:#9fd5b8}
.avail .cell.off{background:#fbdcdc}
.avail .cell.sel{outline:2px solid var(--brand);outline-offset:-2px}
.avail .cell.hour{border-top:1px solid #eef1f6}
.legend{display:flex;gap:14px;font-size:12px;color:var(--muted);margin:8px 0}
.legend i{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:5px;vertical-align:-2px}

/* calendar */
.cal{display:grid;grid-template-columns:repeat(7,1fr);gap:6px}
.cal .day{background:#fff;border:1px solid var(--line);border-radius:8px;min-height:96px;padding:6px}
.cal .day.other{background:#f7f9fd;opacity:.6}
.cal .dn{font-size:11px;color:var(--muted);font-weight:600}
.cal .ev{background:var(--brand-soft);color:#1e4fb0;border-radius:6px;padding:3px 5px;font-size:11px;margin-top:3px;cursor:pointer;line-height:1.3}
.cal .ev.ta{background:#eef7ef;color:#0c6448}
.cal .hd7{text-align:center;font-size:12px;color:var(--muted);font-weight:600;padding:4px}

/* slider */
.slider-row{display:grid;grid-template-columns:150px 1fr 110px;gap:10px;align-items:center;margin-bottom:8px}
.slider-row input[type=range]{width:100%;padding:0}
.slider-row .val{text-align:right;font-variant-numeric:tabular-nums;font-weight:600}
.bar{height:10px;background:#eef1f6;border-radius:6px;overflow:hidden}
.bar>i{display:block;height:100%;background:var(--brand)}

.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:14px;flex-wrap:wrap}
.tab{padding:8px 14px;cursor:pointer;border-bottom:2px solid transparent;font-size:13.5px;color:var(--muted)}
.tab.active{color:var(--brand);border-color:var(--brand);font-weight:600}
.chips{display:flex;gap:6px;flex-wrap:wrap}
.chip{background:#eef1f6;border-radius:20px;padding:3px 10px;font-size:12px;display:inline-flex;gap:6px;align-items:center}
.chip b{font-weight:600}
.chip .x{cursor:pointer;color:var(--muted)}
.media-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:10px}
.media-grid .m{border:1px solid var(--line);border-radius:8px;overflow:hidden;background:#fff}
.media-grid .m img,.media-grid .m video{width:100%;height:100px;object-fit:cover;display:block;background:#000}
.media-grid .m .cap{padding:6px;font-size:11px;color:var(--muted);word-break:break-all}
.dropzone{border:2px dashed var(--line-strong);border-radius:10px;padding:18px;text-align:center;color:var(--muted);cursor:pointer;font-size:13px}
.dropzone.drag{background:var(--brand-soft);border-color:var(--brand)}
.avail .cell.don{background:#eaf6ef}
.avail .cell.doff{background:#f4f6fa}
.avail .cell.on{background:#5fbf8f}
.avail .cell.off{background:#f0a3a3}
.avail .cell.prev{outline:2px solid var(--brand);outline-offset:-2px}
.avail .cell{touch-action:none}

/* 調度矩陣 (教室 × 日期) */
table.matrix{border-collapse:separate;border-spacing:0}
table.matrix th.mx-r{position:sticky;left:0;z-index:3;background:var(--panel-2);min-width:150px;
  font-size:12.5px;color:var(--text);font-weight:600;border-bottom:1px solid var(--line)}
table.matrix th.mx-h{text-align:center;min-width:62px;padding:6px 4px;line-height:1.2}
table.matrix th.mx-h.we{background:#f0f3f9}
table.matrix th.mx-h.tdy{background:var(--brand-soft);color:var(--brand)}
table.matrix td.mx{text-align:center;padding:4px 3px;border-left:1px solid #f0f3f8;min-width:62px}
table.matrix td.mx .mq{font-size:15px;font-weight:700;font-variant-numeric:tabular-nums;line-height:1.1}
table.matrix td.mx .mv{font-size:10.5px;line-height:1.3;white-space:nowrap}
table.matrix td.mx .mv .in{color:#12855f;margin-right:3px}
table.matrix td.mx .mv .out{color:#c53434}
table.matrix td.mx .mk{font-size:10px;color:#b7791f;background:#fdf3e0;border-radius:4px;display:inline-block;padding:0 4px}
table.matrix tr.mx-sum th,table.matrix tr.mx-sum td{background:var(--panel-2);border-top:2px solid var(--line-strong)}
#dbody tr.locked{background:#fffdf5}
#dbody tr.edited{background:#eef7ff}
#dbody tr.edited input[data-k=keep]{border-color:var(--brand);font-weight:700}

/* 課表總覽 (Google Calendar 風格) */
.tl-wrap{display:grid;grid-template-columns:58px 1fr;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff}
.tl-headrow{display:grid;grid-template-columns:58px 1fr;border-bottom:1px solid var(--line);background:var(--panel-2);position:sticky;top:0;z-index:5}
.tl-heads{display:grid}
.tl-head{padding:6px 4px;text-align:center;font-size:12px;border-left:1px solid var(--line);line-height:1.3}
.tl-head.tdy{background:var(--brand-soft);color:var(--brand);font-weight:700}
.tl-head b{font-size:14px}
.tl-gutter{position:relative}
.tl-gutter .hr{position:absolute;right:6px;font-size:11px;color:var(--muted);transform:translateY(-50%)}
.tl-cols{display:grid;position:relative}
.tl-col{position:relative;border-left:1px solid var(--line);min-height:100%}
.tl-col.we{background:#fafbfe}
.tl-line{position:absolute;left:0;right:0;border-top:1px solid #eef1f6;pointer-events:none}
.tl-line.h{border-top-color:#e2e8f4}
.tl-now{position:absolute;left:0;right:0;border-top:2px solid #e05252;z-index:4;pointer-events:none}
.tl-ev{position:absolute;border-radius:6px;padding:3px 5px;font-size:11px;line-height:1.35;overflow:hidden;
  cursor:pointer;border-left:3px solid;box-shadow:0 1px 2px rgba(20,30,50,.08)}
.tl-ev:hover{filter:brightness(.97);z-index:6;box-shadow:0 4px 12px rgba(20,30,50,.18)}
.tl-ev .t{font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tl-ev .s{opacity:.85;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tl-ev.mine{outline:2px solid #b7791f;outline-offset:-2px}
.tl-legend{display:flex;gap:10px;flex-wrap:wrap;font-size:12px;color:var(--muted);margin-top:8px}
.tl-legend i{display:inline-block;width:11px;height:11px;border-radius:3px;margin-right:4px;vertical-align:-1px}
.tl-month .day{min-height:120px}
.tl-month .mev{border-radius:5px;padding:2px 5px;font-size:11px;margin-top:3px;cursor:pointer;border-left:3px solid;line-height:1.35}
.tl-month .mev:hover{filter:brightness(.97)}
.cal .day.tdy{border-color:var(--brand);box-shadow:inset 0 0 0 1px var(--brand)}
.tl-month .mev.mine{outline:2px solid #b7791f;outline-offset:-2px}