/* ===== BS952261 Mock Exam — styles ===== */
:root {
  color-scheme: light;
  --bg: #f4f3ef;
  --card: #fcfcfb;
  --soft: #efeee9;
  --ink: #0b0b0b;
  --ink2: #52514e;
  --muted: #8a8984;
  --line: #dddcd6;
  --c8: #2a78d6;
  --c9: #6250d6;
  --c10: #1baf7a;
  --c11: #eb6834;
  --c12: #e87ba4;
  --good: #0ca30c;
  --bad: #d03b3b;
  --warn: #c98500;
  --hl: #fff3c4;
  --shadow: 0 1px 2px rgba(0,0,0,.06), 0 4px 14px rgba(0,0,0,.05);
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --bg: #121211; --card: #1a1a19; --soft: #262624; --ink: #f0efec; --ink2: #c3c2b7;
    --muted: #8f8e86; --line: #383835;
    --c8: #3987e5; --c9: #9085e9; --c10: #199e70; --c11: #d95926; --c12: #d55181;
    --hl: #4a4020; --shadow: 0 1px 2px rgba(0,0,0,.4);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #121211; --card: #1a1a19; --soft: #262624; --ink: #f0efec; --ink2: #c3c2b7;
  --muted: #8f8e86; --line: #383835;
  --c8: #3987e5; --c9: #9085e9; --c10: #199e70; --c11: #d95926; --c12: #d55181;
  --hl: #4a4020; --shadow: 0 1px 2px rgba(0,0,0,.4);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: "Sarabun", "Leelawadee UI", "Leelawadee", "Tahoma", system-ui, sans-serif;
  font-size: 16.5px; line-height: 1.65;
}
b, strong { font-weight: 700; }
small { color: var(--ink2); }
a { color: var(--c8); }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50; background: var(--card);
  border-bottom: 1px solid var(--line); box-shadow: var(--shadow);
}
.topbar .inner { max-width: 1080px; margin: 0 auto; padding: 8px 16px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.brand { font-weight: 800; font-size: 1.05rem; white-space: nowrap; }
.brand small { font-weight: 500; }
.tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-left: auto; }
.tab {
  border: 1px solid var(--line); background: var(--soft); color: var(--ink);
  padding: 7px 14px; border-radius: 999px; cursor: pointer; font: inherit; font-size: .95rem;
}
.tab.active { background: var(--ink); color: var(--card); border-color: var(--ink); }
.theme-btn { border: none; background: none; cursor: pointer; font-size: 1.2rem; color: var(--ink); }

main { max-width: 1080px; margin: 0 auto; padding: 18px 16px 80px; }
section.page { display: none; }
section.page.active { display: block; }

h1 { font-size: 1.6rem; margin: .2em 0 .4em; }
h2 { font-size: 1.35rem; margin: 1.2em 0 .5em; }
h3 { font-size: 1.12rem; margin: 1em 0 .4em; }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px 18px; margin: 12px 0; box-shadow: var(--shadow);
}
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 12px; }
.grid3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
.muted { color: var(--ink2); }
.tag {
  display: inline-block; font-size: .78rem; padding: 1px 9px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--soft); color: var(--ink2); margin-right: 4px; white-space: nowrap;
}
.hot {
  display: inline-block; font-size: .76rem; font-weight: 700; padding: 0 8px; border-radius: 6px;
  background: var(--hl); color: var(--ink); border: 1px solid color-mix(in srgb, var(--warn) 45%, transparent);
  margin-left: 4px; vertical-align: 2px; white-space: nowrap;
}
.warnbox {
  border-left: 5px solid var(--warn); background: color-mix(in srgb, var(--warn) 10%, var(--card));
  padding: 10px 14px; border-radius: 10px; margin: 10px 0;
}
.tipbox {
  border-left: 5px solid var(--c10); background: color-mix(in srgb, var(--c10) 9%, var(--card));
  padding: 10px 14px; border-radius: 10px; margin: 10px 0;
}
ul.tight { margin: .3em 0; padding-left: 1.2em; }
ul.tight li { margin: .15em 0; }
kbd { border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 5px; padding: 0 5px; font-size: .85em; background: var(--soft); }

/* chapter accent helpers */
.ch8 { --acc: var(--c8); } .ch9 { --acc: var(--c9); } .ch10 { --acc: var(--c10); }
.ch11 { --acc: var(--c11); } .ch12 { --acc: var(--c12); }
.acc-border { border-top: 5px solid var(--acc); }
.chip-ch {
  display: inline-flex; align-items: center; gap: 6px; font-size: .8rem; font-weight: 700;
  padding: 2px 10px; border-radius: 999px; background: color-mix(in srgb, var(--acc) 14%, var(--card));
  border: 1px solid color-mix(in srgb, var(--acc) 50%, transparent);
}
.chip-ch::before { content: ""; width: 9px; height: 9px; border-radius: 50%; background: var(--acc); }

/* ---------- home ---------- */
.hero { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.stat .k { font-size: .82rem; color: var(--ink2); }
.stat .v { font-size: 1.45rem; font-weight: 800; line-height: 1.2; }
.distbar { display: flex; height: 34px; border-radius: 10px; overflow: hidden; gap: 2px; background: var(--card); margin: 8px 0 4px; }
.distbar div { background: var(--acc); color: #fff; font-size: .8rem; font-weight: 700; display: flex; align-items: center; justify-content: center; text-shadow: 0 1px 2px rgba(0,0,0,.35); }
.distlegend { display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: .85rem; color: var(--ink2); }

/* ---------- summary ---------- */
.subnav { display: flex; gap: 6px; flex-wrap: wrap; margin: 6px 0 14px; position: sticky; top: 58px; z-index: 30; background: var(--bg); padding: 6px 0; }
.subnav button { font: inherit; font-size: .9rem; cursor: pointer; padding: 6px 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--card); color: var(--ink); }
.subnav button.active { background: color-mix(in srgb, var(--acc) 18%, var(--card)); border-color: var(--acc); font-weight: 700; }
.chapter { display: none; }
.chapter.active { display: block; }
.chapter-head { border-radius: var(--radius); padding: 14px 18px; background: color-mix(in srgb, var(--acc) 12%, var(--card)); border: 1px solid color-mix(in srgb, var(--acc) 40%, transparent); }
.chapter-head h2 { margin: 0; }
.topic { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 18px; margin: 14px 0; box-shadow: var(--shadow); border-left: 5px solid var(--acc); }
.topic > h3:first-child { margin-top: 0; }
.mnemonic { display: inline-block; background: var(--soft); border: 1px dashed var(--line); border-radius: 8px; padding: 2px 10px; font-weight: 700; }

/* ---------- figures (shared by summary + quiz) ---------- */
.fig { margin: 10px 0; }
.fig svg { width: 100%; height: auto; display: block; }
.fig svg text { fill: var(--ink); font-family: inherit; }
.fig svg .t2 { fill: var(--ink2); }
.fig svg .halo { paint-order: stroke; stroke: var(--card); stroke-width: 4px; stroke-linejoin: round; }
.fig svg .edge { stroke: var(--ink2); stroke-width: 2; fill: none; }
.fig svg .orgline { stroke: var(--line); stroke-width: 2; fill: none; }
.fig svg .node { fill: var(--card); stroke: var(--ink2); stroke-width: 2; }
.fig svg .node.lead { fill: var(--acc, var(--c8)); stroke: var(--acc, var(--c8)); }
.fig svg .node.off { fill: var(--soft); stroke: var(--line); }
.fig svg .box { fill: var(--card); stroke: var(--ink2); stroke-width: 1.5; }
.fig svg .gridline { stroke: var(--line); stroke-width: 1; }
.fig svg .axis { stroke: var(--ink2); stroke-width: 1.5; }
.figcap { font-size: .85rem; color: var(--ink2); text-align: center; margin-top: 2px; }

.flow { display: flex; flex-wrap: wrap; align-items: stretch; gap: 6px; }
.flow .step {
  flex: 1 1 110px; background: color-mix(in srgb, var(--acc, var(--c8)) 10%, var(--card));
  border: 1px solid color-mix(in srgb, var(--acc, var(--c8)) 45%, transparent);
  border-radius: 10px; padding: 8px 10px; text-align: center; font-size: .9rem; position: relative;
}
.flow .step b { display: block; font-size: .95rem; }
.flow .arrow { align-self: center; color: var(--ink2); font-weight: 700; }
.flow .step.hl { background: var(--hl); border-color: var(--warn); }

.quad { display: grid; grid-template-columns: 34px 1fr 1fr; grid-template-rows: 1fr 1fr 30px; gap: 6px; }
.quad .cell { border-radius: 10px; padding: 10px; border: 1px solid var(--line); background: var(--card); font-size: .9rem; }
.quad .cell b { display: block; }
.quad .ylab { grid-row: 1 / 3; writing-mode: vertical-rl; transform: rotate(180deg); text-align: center; font-size: .82rem; color: var(--ink2); }
.quad .xlab { grid-column: 2 / 4; text-align: center; font-size: .82rem; color: var(--ink2); }
.quad .good { background: color-mix(in srgb, var(--good) 12%, var(--card)); border-color: color-mix(in srgb, var(--good) 45%, transparent); }
.quad .accent { background: color-mix(in srgb, var(--acc, var(--c8)) 13%, var(--card)); border-color: color-mix(in srgb, var(--acc, var(--c8)) 45%, transparent); }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 8px; }
.cards .c { border: 1px solid var(--line); border-radius: 10px; padding: 9px 11px; background: var(--card); font-size: .9rem; }
.cards .c b { display: block; font-size: .96rem; }
.cards .c .ex { color: var(--ink2); font-size: .84rem; }
.cards .c.top { border-top: 4px solid var(--acc, var(--c8)); }

table.cmp { width: 100%; border-collapse: collapse; font-size: .9rem; }
table.cmp th, table.cmp td { border: 1px solid var(--line); padding: 6px 8px; vertical-align: top; text-align: left; }
table.cmp th { background: var(--soft); }
.tablewrap { overflow-x: auto; }

/* pyramid (Maslow mapping) */
.pyr { display: grid; grid-template-columns: 1.5fr .9fr .9fr; gap: 4px 8px; align-items: stretch; }
.pyr .hd { font-size: .8rem; color: var(--ink2); text-align: center; font-weight: 700; }
.pyr .lvl { display: flex; justify-content: center; }
.pyr .lvl span {
  display: block; text-align: center; padding: 6px 4px; border-radius: 6px; font-size: .86rem; line-height: 1.3;
  background: color-mix(in srgb, var(--c10) calc(var(--d) * 1%), var(--card)); border: 1px solid color-mix(in srgb, var(--c10) 55%, transparent);
}
.pyr .map { border-radius: 8px; display: flex; align-items: center; justify-content: center; text-align: center; font-size: .84rem; padding: 4px; line-height: 1.3; }
.pyr .mot { background: color-mix(in srgb, var(--c11) 16%, var(--card)); border: 1px solid color-mix(in srgb, var(--c11) 55%, transparent); }
.pyr .hyg { background: var(--soft); border: 1px solid var(--line); }
.pyr .mcc { background: color-mix(in srgb, var(--c9) 12%, var(--card)); border: 1px solid color-mix(in srgb, var(--c9) 45%, transparent); }

/* stairs (Smith / Tuckman) */
.stairs { display: flex; align-items: flex-end; gap: 4px; }
.stairs .s { flex: 1; border-radius: 8px 8px 0 0; padding: 6px 4px; text-align: center; font-size: .8rem; line-height: 1.25;
  background: color-mix(in srgb, var(--acc, var(--c12)) calc(var(--d) * 1%), var(--card)); border: 1px solid color-mix(in srgb, var(--acc, var(--c12)) 55%, transparent); }
.stairs .s b { display: block; font-size: .86rem; }
.brackets { display: flex; gap: 4px; margin-top: 4px; }
.brackets div { text-align: center; font-size: .78rem; border-top: 2px solid var(--ink2); padding-top: 2px; color: var(--ink2); }

/* six box */
.sixbox { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.sixbox div { border: 1px solid var(--line); border-radius: 10px; padding: 8px; font-size: .86rem; text-align: center; background: var(--card); }
.sixbox div b { display: block; }
.sixbox .center { background: color-mix(in srgb, var(--c12) 18%, var(--card)); border: 2px solid var(--c12); }
.sixbox .empty { border: none; background: transparent; }

/* spectrum bar */
.spectrum { display: grid; grid-template-columns: repeat(var(--n), 1fr); gap: 3px; }
.spectrum div { padding: 7px 6px; font-size: .83rem; text-align: center; line-height: 1.3; border-radius: 6px;
  background: color-mix(in srgb, var(--acc, var(--c9)) calc(var(--d) * 1%), var(--card)); border: 1px solid color-mix(in srgb, var(--acc, var(--c9)) 40%, transparent); }
.spectrum-ends { display: flex; justify-content: space-between; font-size: .8rem; color: var(--ink2); margin-top: 3px; }

/* ---------- quiz ---------- */
.modes { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; }
.mode { text-align: left; cursor: pointer; font: inherit; color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; box-shadow: var(--shadow); }
.mode:hover { border-color: var(--ink2); }
.mode b { font-size: 1.05rem; display: block; }
.mode span { color: var(--ink2); font-size: .9rem; }
.opts { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; margin: 8px 0; }
.opts label { display: inline-flex; gap: 6px; align-items: center; cursor: pointer; }
.chpick { display: flex; flex-wrap: wrap; gap: 6px; }
.chpick label { border: 1px solid var(--line); background: var(--card); border-radius: 999px; padding: 4px 12px; cursor: pointer; display: inline-flex; gap: 6px; align-items: center; }

.qbar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
.progress { flex: 1 1 200px; height: 10px; background: var(--soft); border-radius: 999px; overflow: hidden; border: 1px solid var(--line); }
.progress > div { height: 100%; background: var(--ink2); width: 0; transition: width .25s; }
.score-live { font-weight: 700; white-space: nowrap; }
.qcard { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow); border-top: 5px solid var(--acc); }
.qmeta { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; margin-bottom: 8px; }
.qtext { font-size: 1.12rem; font-weight: 600; margin: 4px 0 14px; }
.choices { display: grid; gap: 8px; }
.choice {
  display: flex; gap: 12px; align-items: flex-start; text-align: left; font: inherit; color: var(--ink);
  background: var(--card); border: 1.5px solid var(--line); border-radius: 12px; padding: 10px 14px; cursor: pointer;
}
.choice:hover:not(:disabled) { border-color: var(--ink2); background: var(--soft); }
.choice .lt { flex: 0 0 30px; height: 30px; border-radius: 50%; border: 1.5px solid var(--ink2); display: flex; align-items: center; justify-content: center; font-weight: 700; }
.choice:disabled { cursor: default; }
.choice.correct { border-color: var(--good); background: color-mix(in srgb, var(--good) 11%, var(--card)); }
.choice.correct .lt { background: var(--good); border-color: var(--good); color: #fff; }
.choice.wrong { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 10%, var(--card)); }
.choice.wrong .lt { background: var(--bad); border-color: var(--bad); color: #fff; }
.choice.dim { opacity: .55; }
.feedback { margin-top: 14px; border-radius: 12px; padding: 12px 16px; border: 1.5px solid; }
.feedback.ok { border-color: var(--good); background: color-mix(in srgb, var(--good) 8%, var(--card)); }
.feedback.no { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 7%, var(--card)); }
.feedback .fh { font-weight: 800; font-size: 1.05rem; margin-bottom: 4px; }
.feedback .why { margin-top: 6px; }
.figtoggle { margin-top: 8px; font: inherit; font-size: .9rem; cursor: pointer; border: 1px solid var(--line); background: var(--card); color: var(--ink); border-radius: 8px; padding: 4px 10px; }
.qnav { display: flex; gap: 8px; justify-content: space-between; margin-top: 14px; flex-wrap: wrap; }
.btn { font: inherit; cursor: pointer; border-radius: 10px; padding: 9px 18px; border: 1px solid var(--line); background: var(--card); color: var(--ink); }
.btn.primary { background: var(--ink); color: var(--card); border-color: var(--ink); font-weight: 700; }
.btn:disabled { opacity: .45; cursor: default; }
.hint { font-size: .82rem; color: var(--muted); margin-top: 6px; }

/* results */
.result-hero { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 10px; }
.result-hero .stat .v { font-size: 2rem; }
.bars { display: grid; gap: 8px; margin-top: 8px; }
.barrow { display: grid; grid-template-columns: 150px 1fr 110px; gap: 10px; align-items: center; font-size: .92rem; }
.bartrack { height: 18px; background: var(--soft); border-radius: 4px; position: relative; }
.bartrack > div { height: 100%; background: var(--c8); border-radius: 0 4px 4px 0; min-width: 2px; }
.barrow .val { text-align: right; font-variant-numeric: tabular-nums; color: var(--ink2); }
.wronglist details { border: 1px solid var(--line); border-radius: 10px; padding: 8px 12px; margin: 6px 0; background: var(--card); }
.wronglist summary { cursor: pointer; font-weight: 600; }

/* calculator */
.calc input { font: inherit; width: 110px; padding: 6px 8px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); color: var(--ink); }
.calc .row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin: 6px 0; }
.calc .out { font-size: 1.15rem; font-weight: 700; margin-top: 8px; }
.calc .steps { font-family: Consolas, "Courier New", monospace; font-size: .92rem; background: var(--soft); border-radius: 8px; padding: 8px 10px; margin-top: 6px; white-space: pre-wrap; }

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .barrow { grid-template-columns: 100px 1fr 80px; }
  .subnav { top: 96px; }
  .pyr { grid-template-columns: 1.3fr .8fr .8fr; }
}