/* ระบบเตรียมสอบสภาฯ — ไม่ต้อง build แก้ไฟล์นี้บนเซิร์ฟเวอร์ได้โดยตรง */
:root {
  --bg: #F4F3EE; --surface: #FFFFFF; --sunken: #ECEAE3; --line: #DAD6CB;
  --ink: #15211F; --ink-soft: #4C5956; --accent: #0E6E6A; --accent-ink: #FFFFFF; --accent-soft: #DDEFEC;
  --good: #1D7A4E; --good-soft: #DFF1E6; --warn: #A1530D; --warn-soft: #FBEBDA; --bad: #B42318; --bad-soft: #FDE7E4; --focus: #1D5FD1;
  --font-body: "IBM Plex Sans Thai", "Leelawadee UI", Tahoma, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111817; --surface: #19221F; --sunken: #212C29; --line: #33413D;
    --ink: #E9EFEC; --ink-soft: #A7B5B1; --accent: #4FB8B0; --accent-ink: #0C1A18; --accent-soft: #183A37;
    --good: #5CC98F; --good-soft: #17332A; --warn: #F0A55E; --warn-soft: #3A2A18; --bad: #FF8A7A; --bad-soft: #3B1F1B; --focus: #7FA8FF;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--ink); font-family: var(--font-body); font-size: 16px; line-height: 1.6; }
a { color: var(--accent); }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
h1, h2, h3 { text-wrap: balance; margin: 0; line-height: 1.3; }
p { margin: 0; }
[hidden] { display: none !important; }

/* top bar */
.bar { position: sticky; top: 0; z-index: 5; background: var(--surface); border-bottom: 1px solid var(--line); }
.bar-in { max-width: 1080px; margin: 0 auto; padding: 10px max(16px, env(safe-area-inset-right)) 10px max(16px, env(safe-area-inset-left)); display: flex; align-items: center; gap: 8px 16px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; color: var(--ink); text-decoration: none; }
.mark { width: 32px; height: 32px; border-radius: 9px; background: var(--accent); display: grid; place-items: center; flex: none; }
.mark svg { stroke: var(--accent-ink); }
.nav { display: flex; gap: 2px; flex-wrap: wrap; flex: 1 1 auto; }
.nav a { padding: 8px 12px; border-radius: 8px; color: var(--ink-soft); text-decoration: none; font-size: 15px; }
.nav a.on { background: var(--accent-soft); color: var(--ink); font-weight: 600; }
.who { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.who img { width: 32px; height: 32px; border-radius: 50%; }
.who small { color: var(--ink-soft); display: block; line-height: 1.2; }
.linkbtn { background: none; border: 0; color: var(--accent); text-decoration: underline; cursor: pointer; padding: 4px; font-size: 14px; }

main { max-width: 1080px; margin: 0 auto; padding: 24px max(16px, env(safe-area-inset-right)) 64px max(16px, env(safe-area-inset-left)); display: flex; flex-direction: column; gap: 20px; }
main.narrow { max-width: 760px; }

.eyebrow { font-size: 13px; font-weight: 600; letter-spacing: 0.04em; color: var(--accent); }
.page-head h1 { font-size: 26px; }
.page-head .meta { color: var(--ink-soft); font-size: 14.5px; margin-top: 4px; }
.code { font-family: var(--font-mono); font-size: 0.92em; }
.hint { color: var(--ink-soft); font-size: 14px; }

.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 20px; display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.panel h2 { font-size: 17px; }
.row { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.grid2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.stack { display: flex; flex-direction: column; gap: 12px; }

.flash { border-radius: 12px; padding: 12px 16px; font-size: 15px; }
.flash.ok { background: var(--good-soft); color: var(--good); }
.flash.err { background: var(--bad-soft); color: var(--bad); }
.flash.warn { background: var(--warn-soft); color: var(--warn); }

/* buttons & inputs */
.btn { border: 0; border-radius: 12px; padding: 10px 18px; min-height: 44px; font-weight: 700; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; gap: 8px; text-decoration: none; }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-ghost { background: transparent; color: var(--accent); border: 1.5px solid var(--accent); }
.btn-sm { min-height: 36px; padding: 6px 12px; font-size: 14px; border-radius: 9px; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-wide { width: 100%; }
.field { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.field label { font-size: 13px; color: var(--ink-soft); }
.input, select.input { border: 1px solid var(--line); background: var(--surface); border-radius: 9px; padding: 9px 12px; min-height: 44px; width: 100%; }
.filters { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; }
.filters .field { flex: 1 1 160px; }

/* subject cards */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 14px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 18px; display: flex; flex-direction: column; gap: 10px; color: var(--ink); text-decoration: none; }
a.card:hover { border-color: var(--accent); }
.card.off { opacity: 0.55; }
.card h3 { font-size: 17px; }

/* modes, chips, segmented */
.modes { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.mode { position: relative; text-align: left; background: var(--surface); border: 2px solid var(--line); border-radius: 12px; padding: 12px 14px; cursor: pointer; display: flex; flex-direction: column; gap: 2px; min-height: 72px; }
.mode input { position: absolute; opacity: 0; pointer-events: none; }
.mode b { font-size: 15.5px; }
.mode span { font-size: 13px; color: var(--ink-soft); }
.mode:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.mode:has(input:focus-visible) { outline: 3px solid var(--focus); outline-offset: 2px; }
.mode:has(input:disabled) { opacity: 0.5; cursor: not-allowed; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { position: relative; border: 1.5px solid var(--line); background: var(--surface); border-radius: 999px; padding: 6px 12px; font-size: 14px; cursor: pointer; min-height: 40px; display: inline-flex; align-items: center; gap: 4px; }
.chip input { position: absolute; opacity: 0; pointer-events: none; }
.chip:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); font-weight: 600; }
.chip:has(input:focus-visible) { outline: 3px solid var(--focus); outline-offset: 2px; }
.chip small { color: var(--ink-soft); font-weight: 400; }
.seg { display: inline-flex; border: 1.5px solid var(--line); border-radius: 10px; overflow: hidden; }
.seg label { position: relative; padding: 8px 16px; cursor: pointer; min-height: 44px; display: inline-flex; align-items: center; font-variant-numeric: tabular-nums; background: var(--surface); }
.seg label + label { border-left: 1.5px solid var(--line); }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg label:has(input:checked) { background: var(--accent); color: var(--accent-ink); font-weight: 600; }
.seg label:has(input:focus-visible) { outline: 3px solid var(--focus); outline-offset: -3px; }

/* topic bars */
.topics { display: flex; flex-direction: column; gap: 10px; }
.trow { display: grid; grid-template-columns: minmax(0, 1fr) 120px 60px; align-items: center; gap: 12px; font-size: 14.5px; }
.track { height: 8px; background: var(--sunken); border-radius: 999px; overflow: hidden; }
.fill { height: 100%; border-radius: 999px; background: var(--accent); }
.fill.low { background: var(--warn); }
.pct { text-align: right; font-weight: 600; font-variant-numeric: tabular-nums; }
.pct.none { color: var(--ink-soft); font-weight: 400; font-size: 13px; }
.tname small { color: var(--ink-soft); display: block; font-size: 12.5px; }

/* practice */
.qhead { display: flex; flex-direction: column; gap: 10px; }
.progress { height: 6px; background: var(--sunken); border-radius: 999px; overflow: hidden; }
.progress > div { height: 100%; background: var(--accent); transition: width 0.25s; }
.qmeta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font-size: 13px; }
.tag { border-radius: 999px; padding: 3px 10px; background: var(--accent-soft); color: var(--ink); font-weight: 600; font-size: 13px; white-space: nowrap; }
.tag.level { background: var(--sunken); font-weight: 500; }
.tag.draft { background: var(--warn-soft); color: var(--warn); }
.tag.approved { background: var(--good-soft); color: var(--good); }
.tag.retired { background: var(--sunken); color: var(--ink-soft); }
.count { margin-left: auto; color: var(--ink-soft); font-variant-numeric: tabular-nums; }
.stem { font-size: 18px; line-height: 1.75; font-weight: 500; white-space: pre-line; }
.choices { display: flex; flex-direction: column; gap: 10px; }
.choice { text-align: left; display: flex; gap: 12px; align-items: flex-start; background: var(--surface); border: 2px solid var(--line); border-radius: 12px; padding: 12px 14px; cursor: pointer; min-height: 56px; line-height: 1.55; width: 100%; }
.choice .letter { flex: none; width: 30px; height: 30px; border-radius: 50%; background: var(--sunken); display: grid; place-items: center; font-weight: 700; font-size: 14px; }
.choice .txt { flex: 1; min-width: 0; }
.choice .verdict { flex: none; font-size: 12.5px; font-weight: 700; padding: 2px 8px; border-radius: 999px; align-self: center; }
.choice:not(:disabled):hover { border-color: var(--accent); }
.choice:disabled { cursor: default; }
.choice.correct { border-color: var(--good); background: var(--good-soft); }
.choice.correct .letter { background: var(--good); color: var(--surface); }
.choice.correct .verdict { color: var(--good); }
.choice.wrong { border-color: var(--warn); background: var(--warn-soft); }
.choice.wrong .letter { background: var(--warn); color: var(--surface); }
.choice.wrong .verdict { color: var(--warn); }
.choice.dim { opacity: 0.6; }
.explain { border-radius: 12px; padding: 16px 18px; display: flex; flex-direction: column; gap: 6px; background: var(--surface); border: 1px solid var(--line); }
.explain .head { font-weight: 700; }
.explain.ok .head { color: var(--good); }
.explain.no .head { color: var(--warn); }
.explain p { white-space: pre-line; }
.keys { font-size: 12.5px; color: var(--ink-soft); text-align: center; }
.keys kbd { font-family: var(--font-mono); border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 5px; padding: 0 5px; background: var(--surface); }

.score { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.score .big { font-size: 48px; font-weight: 700; line-height: 1; font-variant-numeric: tabular-nums; }
.score .of { font-size: 18px; color: var(--ink-soft); }
details.wl { border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
details.wl summary { cursor: pointer; padding: 12px 14px; list-style: none; font-size: 14.5px; }
details.wl summary::-webkit-details-marker { display: none; }
details.wl summary small { color: var(--ink-soft); display: block; }
details.wl .body { padding: 0 14px 14px; display: flex; flex-direction: column; gap: 8px; font-size: 14.5px; }
.ans-ok { color: var(--good); font-weight: 600; }
.ans-no { color: var(--warn); font-weight: 600; }

/* tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
table.t { width: 100%; border-collapse: collapse; font-size: 14.5px; }
table.t th { text-align: left; font-weight: 600; color: var(--ink-soft); background: var(--sunken); padding: 10px 14px; white-space: nowrap; }
table.t td { padding: 10px 14px; border-top: 1px solid var(--line); vertical-align: top; }
table.t td.num, table.t th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
table.t tr.risk td:first-child { box-shadow: inset 3px 0 0 var(--warn); }
.clip { max-width: 460px; }
.muted { color: var(--ink-soft); }
.stat-tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; }
.tile { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; }
.tile .k { font-size: 13px; color: var(--ink-soft); }
.tile .v { font-size: 26px; font-weight: 700; font-variant-numeric: tabular-nums; }
.pager { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.pager a, .pager span { padding: 6px 12px; border-radius: 8px; border: 1px solid var(--line); text-decoration: none; font-size: 14px; background: var(--surface); }
.pager .cur { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

/* distractor bars on the question page */
.dist { display: flex; flex-direction: column; gap: 8px; }
.dist .r { display: grid; grid-template-columns: 30px minmax(0, 1fr) 140px 56px; gap: 10px; align-items: center; font-size: 14.5px; }
.dist .r.ok .letter { background: var(--good); color: var(--surface); }
.letter { width: 28px; height: 28px; border-radius: 50%; background: var(--sunken); display: grid; place-items: center; font-weight: 700; font-size: 13px; }

/* login */
.login { min-height: 100vh; display: grid; place-items: center; padding: 24px 16px; }
.login .box { max-width: 420px; width: 100%; background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 32px 28px; display: flex; flex-direction: column; gap: 18px; text-align: center; }
.gbtn { display: inline-flex; align-items: center; justify-content: center; gap: 12px; border: 1.5px solid var(--line); background: var(--surface); color: var(--ink); border-radius: 12px; min-height: 52px; font-weight: 600; text-decoration: none; font-size: 16px; }
.gbtn:hover { border-color: var(--accent); }

@media (max-width: 640px) {
  .modes, .grid2 { grid-template-columns: minmax(0, 1fr); }
  .trow { grid-template-columns: minmax(0, 1fr) 72px 50px; gap: 8px; }
  .stem { font-size: 17px; }
  .dist .r { grid-template-columns: 28px minmax(0, 1fr) 60px 48px; }
}
@media (prefers-reduced-motion: reduce) { .progress > div { transition: none; } }
.nowrap { white-space: nowrap; }

/* ปุ่มเลือกชุดข้อสอบ */
.set-card { margin: 0; display: flex; }
.set-btn { width: 100%; font: inherit; color: inherit; }
.set-btn:hover, .set-btn:focus-visible { border-color: var(--accent, #0e6e6a); }

/* ทำข้อสอบเป็นชุด (จับเวลา) */
.exam-bar { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 5; display: flex; justify-content: space-between; align-items: center; gap: 12px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 10px 14px; }
.exam-title { display: flex; flex-direction: column; min-width: 0; }
.exam-title b { font-size: 16px; }
.timer { font-family: var(--font-mono); font-size: 26px; font-weight: 700; font-variant-numeric: tabular-nums; padding: 4px 12px; border-radius: 10px; background: var(--accent-soft); }
.timer.low { background: var(--warn-soft); color: var(--warn); }
.choice.picked { border-color: var(--accent); background: var(--accent-soft); }
.choice.picked .letter { background: var(--accent); color: var(--accent-ink); }
.palette { display: grid; grid-template-columns: repeat(auto-fill, minmax(44px, 1fr)); gap: 6px; }
.palette button { min-height: 44px; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); font: inherit; font-variant-numeric: tabular-nums; cursor: pointer; }
.palette button.done { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.palette button.cur { outline: 3px solid var(--focus, var(--accent)); outline-offset: 1px; }
.pal-key { display: inline-block; width: 12px; height: 12px; border-radius: 3px; vertical-align: -1px; background: var(--accent); }
.finish p { margin: 0; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* แก้ข้อสอบ */
.choice-edit { display: grid; grid-template-columns: 28px 30px minmax(0, 1fr); gap: 8px; align-items: start; }
.choice-edit input[type=radio] { width: 22px; height: 22px; margin-top: 11px; accent-color: var(--good); }
.choice-edit .letter { width: 30px; height: 30px; margin-top: 7px; border-radius: 50%; background: var(--sunken); display: grid; place-items: center; font-weight: 700; font-size: 14px; }
.choice-edit:has(input:checked) .letter { background: var(--good); color: var(--surface); }
.choice-edit:has(input:checked) textarea { border-color: var(--good); }
textarea.input { resize: vertical; line-height: 1.6; font: inherit; }