/* Flat Mono: extracted from ExamInsight STYLE.md; checked against server/app.py. */

:root {
  --bg:#fafafa;            /* page background */
  --surface:#ffffff;       /* cards, inputs, table cells */
  --surface-soft:#f5f5f5;  /* table headers, subtle fills */
  --text:#111111;          /* primary text + primary buttons */
  --muted:#6b6b6b;         /* secondary text, labels, meta */
  --border:#e5e5e5;        /* hairline dividers, card borders */
  --border-strong:#cfcfcf; /* input borders, secondary buttons */
  --danger:#b42318;        /* destructive / errors */
  --success:#067647;       /* confirmations / "open" states */

  /* Difficulty / category accents (charts, badges) */
  --easy:#067647;          /* E — green  */
  --avg:#8a6d00;           /* A — amber  */
  --diff:#b42318;          /* D — red    */
}


:root { --bg:#fafafa; --surface:#ffffff; --surface-soft:#f5f5f5; --text:#111111; --muted:#6b6b6b; --border:#e5e5e5; --border-strong:#cfcfcf; --danger:#b42318; --success:#067647; --easy:#067647; --avg:#8a6d00; --diff:#b42318; }
* { box-sizing:border-box; margin:0; padding:0; }
html { -webkit-text-size-adjust:100%; }
body { background:var(--bg); color:var(--text); font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Noto Sans TC",Arial,sans-serif; font-size:16px; line-height:1.5; }
a { color:var(--text); text-decoration:none; text-underline-offset:3px; }
a:hover { text-decoration:underline; }
button,input,select,textarea { font:inherit; }
input,select,textarea { background:#fff; color:var(--text); border:1px solid var(--border-strong); border-radius:0; min-height:44px; padding:10px 12px; }
input:focus,select:focus,textarea:focus,button:focus-visible,a:focus-visible { outline:2px solid var(--text); outline-offset:2px; box-shadow:none; }
label { display:block; color:var(--text); font-size:.88rem; font-weight:650; margin-bottom:6px; }
.meta,.subtitle,.help { color:var(--muted); }

.page { width:min(100%,1120px); margin:0 auto; padding:32px 24px; }
.card { background:var(--surface); border:1px solid var(--border); border-radius:0; padding:24px; margin-bottom:16px; box-shadow:none; }

/* Buttons */
.btn,.btn-primary,.btn-secondary,.btn-danger,button { min-height:44px; display:inline-flex; align-items:center; justify-content:center; padding:10px 14px; border:1px solid var(--text); border-radius:0; background:#fff; color:var(--text); font-weight:650; font-size:.92rem; cursor:pointer; text-decoration:none; }
.btn-primary { background:#111; color:#fff; border-color:#111; }
.btn-secondary { background:#fff; color:#111; border-color:var(--border-strong); }
.btn-danger { color:var(--danger); border-color:#e7b8b4; background:#fff; }
.btn-logout { color:var(--danger); border-color:#e7b8b4; background:#fdeceb; }
.btn:hover,button:hover { opacity:.72; text-decoration:none; }

/* Messages */
.error { background:#fff; color:var(--danger); border:1px solid #e7b8b4; padding:12px 14px; }
.success { background:#fff; color:var(--success); border:1px solid #a9d8c4; padding:12px 14px; }

/* Header + action row (see §3) */
.topbar { display:flex; justify-content:space-between; gap:24px; align-items:flex-start; padding-bottom:20px; margin-bottom:8px; border-bottom:1px solid var(--border); }
.brand h1 { font-size:1.6rem; line-height:1.12; letter-spacing:-.03em; font-weight:700; margin-bottom:6px; }
.brand h1 a { color:inherit; text-decoration:none; }
.brand p { color:var(--muted); font-size:.92rem; }
.nav { display:flex; align-items:center; justify-content:flex-end; gap:8px; flex-wrap:wrap; }
.quick-actions { display:flex; flex-wrap:wrap; gap:8px; align-items:center; margin:0 0 18px; padding:18px 0; border-bottom:1px solid var(--border); }

@media (max-width:840px){ .topbar{flex-direction:column;} .nav,.quick-actions{justify-content:flex-start;} .quick-actions a,.quick-actions button{flex:1 1 auto;} }
@media (max-width:760px){ .page{padding:20px 14px;} .card{padding:18px;} }


.field-row { display:block; margin-bottom:16px; max-width:560px; }
.field-row label { display:block; margin:0 0 6px; font-weight:650; }
.field-row input { display:block; width:100%; min-height:44px; padding:10px 14px; border:1px solid var(--border-strong); font-size:1rem; }
.toolbar { display:flex; gap:8px; flex-wrap:wrap; align-items:center; }


.table-wrap { overflow:auto; border:1px solid var(--border); }   /* horizontal scroll */
table { width:100%; border-collapse:collapse; font-size:.9rem; }
th { background:var(--surface-soft); text-align:left; padding:11px 10px; border-bottom:1px solid var(--text); font-weight:700; font-size:.74rem; text-transform:uppercase; letter-spacing:.03em; color:var(--muted); }
td { padding:10px 12px; border-bottom:1px solid var(--border); }
tr:hover td { background:#f7f7f7; }
td.num, th.num { text-align:right; font-variant-numeric:tabular-nums; } /* or center for grids */


.badge { display:inline-block; padding:2px 8px; border:1px solid var(--border-strong); font-size:.76rem; font-weight:700; }
.pill-open   { color:var(--success); border-color:#a9d8c4; background:#eef8f2; }
.pill-closed { color:var(--danger);  border-color:#e7b8b4; background:#fdeceb; }


.modal-backdrop { position:fixed; inset:0; background:rgba(0,0,0,.35); display:none; align-items:center; justify-content:center; padding:20px; z-index:50; }
.modal { width:min(100%,480px); background:#fff; border:1px solid #111; padding:24px; }
.modal h3 { font-size:1.25rem; margin-bottom:10px; }
.modal p { color:var(--muted); margin-bottom:18px; }
.modal-actions { display:flex; gap:8px; justify-content:flex-end; flex-wrap:wrap; }


.cards { display:grid; grid-template-columns:repeat(auto-fit,minmax(120px,1fr)); gap:10px; }
.card-stat { border:1px solid var(--border); background:#fff; padding:12px 14px; text-align:center; }
.card-stat .k { color:var(--muted); font-size:.72rem; font-weight:700; text-transform:uppercase; letter-spacing:.04em; }
.card-stat .v { font-size:1.5rem; font-weight:750; letter-spacing:-.02em; margin-top:2px; }


@media print {
  .noprint { display:none !important; }   /* wrap toolbars/nav in .noprint */
  body { background:#fff; }
  .page { padding:0; }
}

/* Reusable accessibility and layout additions. */
button:disabled { opacity:.45; cursor:not-allowed; }
button:disabled:hover { opacity:.45; }
[hidden] { display:none !important; }
.field-row input,.field-row select,.field-row textarea { max-width:100%; }
.card-head { display:flex;align-items:center;justify-content:space-between;gap:12px;padding-bottom:14px;border-bottom:1px solid var(--border);margin-bottom:14px; }
h2 {font-size:1.05rem;letter-spacing:-.01em;}
.stack {display:grid;gap:16px;}