/* THPT-QA Data Platform — giao diện sáng/tối, chữ ≥16px, tương phản WCAG AA */
:root {
  --bg: #f5f6f3; --surface: #ffffff; --surface-2: #eef0ea; --ink: #1c2321; --ink-2: #4a5552; --line: #d6dbd3;
  --brand: #1f5f4a; --brand-ink: #ffffff; --brand-soft: #e2efe8; --accent: #b4532a;
  --ok: #1e6b3a; --ok-soft: #e1f1e6; --warn: #8a5a00; --warn-soft: #fbefd5; --bad: #a3271f; --bad-soft: #f8e1de;
  --l0: #c9534a; --l1: #d9a441; --l2: #2f7d5b; --lnone: #b9bfb6; --ldraft: #7d8fa6;
  --radius: 10px; --shadow: 0 1px 2px rgba(20,30,25,.06), 0 2px 8px rgba(20,30,25,.05);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121615; --surface: #1b2120; --surface-2: #232b29; --ink: #e8ece9; --ink-2: #a9b4b0; --line: #34403c;
    --brand: #6cc3a0; --brand-ink: #0d1a15; --brand-soft: #1f3a30; --accent: #e59a6f;
    --ok: #79d39b; --ok-soft: #1b3324; --warn: #f0c060; --warn-soft: #3a2f17; --bad: #f19288; --bad-soft: #3d1f1c;
    --l0: #e07a70; --l1: #e5bd62; --l2: #5fbf8f; --lnone: #55605c; --ldraft: #8ea3bf;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #121615; --surface: #1b2120; --surface-2: #232b29; --ink: #e8ece9; --ink-2: #a9b4b0; --line: #34403c;
  --brand: #6cc3a0; --brand-ink: #0d1a15; --brand-soft: #1f3a30; --accent: #e59a6f;
  --ok: #79d39b; --ok-soft: #1b3324; --warn: #f0c060; --warn-soft: #3a2f17; --bad: #f19288; --bad-soft: #3d1f1c;
  --l0: #e07a70; --l1: #e5bd62; --l2: #5fbf8f; --lnone: #55605c; --ldraft: #8ea3bf;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { font-size: 16px; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.55 "Segoe UI", "Helvetica Neue", Roboto, "Noto Sans", Arial, sans-serif; }
a { color: var(--brand); }
h1 { font-size: 1.6rem; margin: .2rem 0 1rem; letter-spacing: -.01em; }
h2 { font-size: 1.25rem; margin: 1.4rem 0 .6rem; }
h3 { font-size: 1.08rem; margin: 1rem 0 .4rem; }
small, .muted { color: var(--ink-2); }
.sample-banner { background: repeating-linear-gradient(135deg, var(--warn-soft) 0 14px, transparent 14px 28px), var(--surface); color: var(--warn); text-align: center; font-weight: 700; letter-spacing: .08em; padding: 4px 8px; border-bottom: 1px solid var(--line); font-size: .9rem; }
.topbar { display: flex; align-items: center; gap: 12px; padding: 10px 20px; background: var(--surface); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5; }
.brand { font-weight: 800; color: var(--ink); text-decoration: none; display: flex; align-items: center; gap: 8px; white-space: nowrap; }
.brand-mark { width: 28px; height: 28px; border-radius: 7px; background: var(--brand); color: var(--brand-ink); display: grid; place-items: center; font-size: .8rem; font-weight: 800; }
.topbar .spacer { flex: 1; }
.topbar .who { font-size: .92rem; color: var(--ink-2); text-align: right; }
.layout { display: grid; grid-template-columns: 240px minmax(0, 1fr); min-height: calc(100vh - 60px); }
.layout > * { min-width: 0; }
.row > h1, .row > h2, .row > h3 { min-width: 0; overflow-wrap: anywhere; flex: 0 1 auto; }
.sidenav { background: var(--surface); border-right: 1px solid var(--line); padding: 16px 10px; }
.sidenav .group { font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-2); margin: 14px 10px 6px; }
.sidenav a { display: block; padding: 8px 10px; border-radius: 8px; text-decoration: none; color: var(--ink); }
.sidenav a:hover { background: var(--surface-2); }
.sidenav a.active { background: var(--brand-soft); color: var(--brand); font-weight: 600; }
main { padding: 22px 28px 40px; max-width: 1280px; width: 100%; }
.single main, main.single { margin: 0 auto; max-width: 1180px; }
footer { padding: 18px 28px; color: var(--ink-2); font-size: .9rem; border-top: 1px solid var(--line); background: var(--surface); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; box-shadow: var(--shadow); margin-bottom: 16px; }
.grid { display: grid; gap: 14px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); } .g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); } .g6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.kpi { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; box-shadow: var(--shadow); }
.kpi .v { font-size: 1.7rem; font-weight: 750; font-variant-numeric: tabular-nums; line-height: 1.2; }
.kpi .v.nodata { font-size: 1rem; color: var(--ink-2); font-weight: 600; padding-top: .5rem; }
.kpi .l { color: var(--ink-2); font-size: .9rem; }
.note { background: var(--surface-2); border-left: 4px solid var(--brand); padding: 8px 12px; border-radius: 6px; font-size: .95rem; margin: 8px 0 16px; }
.flash { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; }
.flash.ok { background: var(--ok-soft); color: var(--ok); } .flash.err { background: var(--bad-soft); color: var(--bad); }
table { border-collapse: collapse; width: 100%; font-size: .95rem; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 650; color: var(--ink-2); background: var(--surface-2); position: sticky; top: 0; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.table-wrap table th:first-child, .table-wrap table td:first-child { position: sticky; left: 0; background: inherit; }
.table-wrap tbody td:first-child { background: var(--surface); }
label { display: block; font-weight: 600; margin: 10px 0 4px; font-size: .95rem; }
input[type=text], input[type=email], input[type=password], input[type=date], input[type=number], input[type=file], select, textarea {
  width: 100%; padding: 10px 12px; font: inherit; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 8px; min-height: 44px; }
textarea { min-height: 110px; resize: vertical; }
input:focus, select:focus, textarea:focus, button:focus-visible, a:focus-visible { outline: 3px solid color-mix(in srgb, var(--brand) 45%, transparent); outline-offset: 1px; }
.btn, button { display: inline-flex; align-items: center; gap: 6px; padding: 9px 16px; min-height: 42px; border-radius: 8px; border: 1px solid var(--brand); background: var(--brand); color: var(--brand-ink); font: inherit; font-weight: 600; cursor: pointer; text-decoration: none; }
.btn.ghost, button.ghost { background: transparent; color: var(--brand); }
.btn.danger, button.danger { background: var(--bad); border-color: var(--bad); color: #fff; }
.btn.sm, button.sm { padding: 5px 10px; min-height: 34px; font-size: .9rem; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.row > * { flex: 0 0 auto; }
.inline { display: inline; }
.pill { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: .82rem; font-weight: 650; background: var(--surface-2); color: var(--ink-2); white-space: nowrap; }
.pill.bb { background: var(--brand-soft); color: var(--brand); }
.pill.ok { background: var(--ok-soft); color: var(--ok); } .pill.warn { background: var(--warn-soft); color: var(--warn); } .pill.bad { background: var(--bad-soft); color: var(--bad); }
.cell { display: inline-block; min-width: 34px; padding: 3px 6px; text-align: center; border-radius: 6px; font-size: .8rem; font-weight: 700; color: #fff; }
.st-chua_co { background: var(--lnone); color: var(--ink); } .st-dang_soan { background: var(--ldraft); }
.st-de_xuat_0 { background: var(--l0); } .st-de_xuat_1 { background: var(--l1); color: #2b2100; } .st-de_xuat_2 { background: var(--l2); }
.st-phe_duyet { background: var(--surface); color: var(--ink); box-shadow: inset 0 0 0 2px var(--ink); }
.approved { box-shadow: inset 0 0 0 2px var(--ink), 0 0 0 1px var(--surface); outline: 2px solid var(--ink); outline-offset: 1px; }
.legend { display: flex; flex-wrap: wrap; gap: 12px; font-size: .88rem; color: var(--ink-2); margin: 8px 0; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.chart-box { position: relative; height: 300px; }
.tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.tabs a { padding: 6px 12px; border-radius: 999px; border: 1px solid var(--line); text-decoration: none; color: var(--ink); background: var(--surface); font-size: .92rem; }
.tabs a.on { background: var(--brand); color: var(--brand-ink); border-color: var(--brand); }
details > summary { cursor: pointer; font-weight: 600; }
.auth { max-width: 520px; margin: 40px auto; }
.crit-text { white-space: pre-line; background: var(--surface-2); border-radius: 8px; padding: 10px 12px; font-size: .95rem; }
.warn-box { background: var(--warn-soft); color: var(--warn); padding: 8px 12px; border-radius: 8px; margin: 6px 0; }
.code { font-family: ui-monospace, Consolas, monospace; font-size: .92rem; }
.theme-toggle { background: transparent; color: var(--ink-2); border: 1px solid var(--line); min-height: 36px; padding: 4px 10px; }
@media (max-width: 900px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .sidenav { border-right: 0; border-bottom: 1px solid var(--line); padding: 8px; display: flex; gap: 4px; overflow-x: auto; white-space: nowrap; }
  .sidenav .group { display: none; }
  .sidenav a { flex: 0 0 auto; }
  .g6 { grid-template-columns: repeat(2, minmax(0, 1fr)); } .g3, .g2 { grid-template-columns: 1fr; }
  main { padding: 16px; }
  .topbar { padding: 8px 16px; flex-wrap: wrap; }
  .topbar .who { display: none; }
  footer { padding: 14px 16px; }
}
@media print { .topbar, .sidenav, footer, .no-print { display: none !important; } .layout { display: block; } }