/* ============================================================
   Calibration Tool — visual layer
   Built on EA Vietnam tokens. All sizes scale with --font-scale.
   ============================================================ */

* { box-sizing: border-box; }
html { color-scheme: light; }
html, body, #root { margin: 0; padding: 0; }

:root {
  --font-scale: 1;
  --accent-rgb: 14, 135, 156;
  --accent: rgb(var(--accent-rgb));
  --accent-soft: rgba(var(--accent-rgb), 0.10);
  --accent-mid: rgba(var(--accent-rgb), 0.25);
  --accent-deep: rgb(27, 82, 102);
  --paper: #FAFAF7;
  --paper-2: #F2F1EA;
  --rule: rgba(14,135,156,0.16);
  --rule-soft: rgba(14,135,156,0.08);
  --ink: var(--ea-teal-ink);
  --ink-2: var(--ea-graphite);
}

html, body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: calc(16px * var(--font-scale));
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.app {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

/* ----------------------------- Header ---------------------------------- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 40px;
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
}
.brand img { height: 28px; display: block; }
.header-meta {
  font-size: 12px;
  color: var(--ink-2);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 500;
}

.link-btn {
  background: none;
  border: 0;
  font: inherit;
  font-size: 13px;
  color: var(--accent);
  cursor: pointer;
  padding: 6px 0;
  letter-spacing: -0.005em;
  text-decoration: underline;
  text-decoration-thickness: 1.2px;
  text-underline-offset: 4px;
  text-decoration-color: var(--accent-mid);
  transition: color var(--dur-fast) var(--ease-standard), text-decoration-color var(--dur-fast) var(--ease-standard);
}
.link-btn:hover { color: var(--accent-deep); text-decoration-color: var(--accent); }
.link-btn:disabled { opacity: 0.35; cursor: not-allowed; }

/* ----------------------------- Buttons --------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  border: 0;
  cursor: pointer;
  font: inherit;
  font-weight: 600;
  letter-spacing: -0.005em;
  border-radius: 6px;
  padding: 14px 22px;
  font-size: calc(15px * var(--font-scale));
  transition: background var(--dur-fast) var(--ease-standard),
              color var(--dur-fast) var(--ease-standard),
              transform var(--dur-fast) var(--ease-standard),
              box-shadow var(--dur-fast) var(--ease-standard);
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 1px 0 rgba(0,0,0,0.04);
}
.btn-primary:hover { background: var(--accent-deep); }
.btn-primary:active { transform: translateY(1px); }
.btn-primary:disabled {
  background: rgba(var(--accent-rgb), 0.30);
  color: rgba(255,255,255,0.85);
  cursor: not-allowed;
}
.btn-ghost {
  background: transparent;
  color: var(--accent-deep);
  border: 1px solid var(--rule);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-arrow { display: inline-block; transform: translateY(-1px); font-weight: 400; }
.btn-meta {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  background: rgba(255,255,255,0.18);
  padding: 3px 8px;
  border-radius: 3px;
}

/* ----------------------------- Footer ---------------------------------- */
.app-foot {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px 40px;
  border-top: 1px solid var(--rule-soft);
  font-size: 12px;
  color: var(--ink-2);
  letter-spacing: -0.005em;
}
.foot-sep { opacity: 0.5; }
.foot-en { font-style: italic; opacity: 0.8; }
.foot-link { color: var(--accent); margin-left: auto; text-decoration: none; }
.foot-link:hover { color: var(--accent-deep); text-decoration: underline; }

/* ============================================================
   INTRO
   ============================================================ */
.intro {
  max-width: 1080px;
  margin: 0 auto;
  padding: 80px 40px 96px;
  width: 100%;
}
.intro-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 64px;
  align-items: start;
}
.eyebrow {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 18px;
}
.intro-title {
  font-size: calc(64px * var(--font-scale));
  line-height: 1.04;
  letter-spacing: -0.025em;
  font-weight: 600;
  color: var(--accent-deep);
  margin: 0 0 28px;
  text-wrap: balance;
  max-width: 18ch;
}
.flourish {
  font-family: 'Instrument Serif', Georgia, serif;
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.03em;
  color: var(--accent);
}
.intro-p {
  font-size: calc(17px * var(--font-scale));
  line-height: 1.55;
  color: var(--ink);
  margin: 0 0 16px;
  max-width: 56ch;
  text-wrap: pretty;
}
.intro-cta-row {
  display: flex;
  gap: 12px;
  align-items: center;
  margin: 36px 0 24px;
  flex-wrap: wrap;
}
.intro-source {
  font-size: 12px;
  color: var(--ink-2);
  font-style: italic;
  margin: 0;
  max-width: 50ch;
}
.intro-meta {
  border-top: 1px solid var(--accent);
  padding-top: 20px;
  font-size: 14px;
}
.intro-meta dl { margin: 0 0 32px; }
.intro-meta dl > div {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--rule-soft);
}
.intro-meta dt { color: var(--ink-2); font-size: 12px; letter-spacing: 0.04em; text-transform: uppercase; font-weight: 500; }
.intro-meta dd { margin: 0; color: var(--ink); font-weight: 500; }
.intro-bullets h3 {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
  font-weight: 600;
  margin: 0 0 12px;
}
.intro-bullets ul { list-style: none; padding: 0; margin: 0; }
.intro-bullets li {
  position: relative;
  padding-left: 18px;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--ink);
  margin: 0 0 10px;
}
.intro-bullets li::before {
  content: "";
  position: absolute;
  left: 0; top: 9px;
  width: 8px; height: 1.5px;
  background: var(--accent);
}

/* ============================================================
   QUESTION
   ============================================================ */
.question {
  max-width: 800px;
  margin: 0 auto;
  padding: 36px 32px 48px;
  width: 100%;
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: calc(100vh - 130px);
  gap: 24px;
}

.q-progress { display: flex; flex-direction: column; gap: 10px; }
.q-rounds {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}
.seg-bar {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 3px;
  height: 4px;
}
.tick { background: var(--rule-soft); border-radius: 1px; }
.seg-active .tick.on { background: var(--accent); }
.seg-done .tick { background: var(--accent-mid); }
.q-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-2);
  font-weight: 500;
  margin-top: 4px;
}
.q-round-label { color: var(--accent-deep); font-weight: 600; }

.q-stage {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 36px;
  padding: 24px 0;
}
.q-text-wrap {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.q-prompt-eye {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}
.q-text {
  font-size: calc(34px * var(--font-scale));
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 600;
  color: var(--accent-deep);
  margin: 0;
  text-wrap: balance;
}

.answers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.answer {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 16px;
  padding: 22px 22px;
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 8px;
  cursor: pointer;
  font: inherit;
  text-align: left;
  transition: border-color var(--dur-fast) var(--ease-standard),
              background var(--dur-fast) var(--ease-standard),
              transform var(--dur-fast) var(--ease-standard),
              box-shadow var(--dur-fast) var(--ease-standard);
  min-height: 76px;
}
.answer:hover {
  border-color: var(--accent);
  background: rgba(var(--accent-rgb), 0.02);
}
.answer-on {
  border-color: var(--accent);
  background: rgba(var(--accent-rgb), 0.06);
  box-shadow: inset 0 0 0 1px var(--accent);
}
.answer-letter {
  width: 32px; height: 32px;
  display: grid; place-items: center;
  border: 1px solid var(--rule);
  border-radius: 4px;
  font-family: 'Roboto Slab', Georgia, serif;
  font-weight: 500;
  font-size: 14px;
  color: var(--ink-2);
  background: var(--paper);
  transition: inherit;
}
.answer-on .answer-letter {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.answer-label {
  font-size: calc(18px * var(--font-scale));
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.confidence {
  border-top: 1px solid var(--rule-soft);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.conf-prompt-row { display: flex; align-items: baseline; justify-content: space-between; }
.conf-prompt {
  font-size: calc(15px * var(--font-scale));
  font-weight: 500;
  color: var(--accent-deep);
  letter-spacing: -0.005em;
}
.conf-chips {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}
.chip {
  display: inline-flex;
  align-items: baseline;
  justify-content: center;
  gap: 1px;
  padding: 14px 6px;
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 6px;
  font: inherit;
  cursor: pointer;
  color: var(--ink);
  transition: inherit;
}
.chip:hover { border-color: var(--accent); }
.chip-num {
  font-family: 'Roboto Slab', Georgia, serif;
  font-weight: 500;
  font-size: calc(20px * var(--font-scale));
  letter-spacing: -0.01em;
  color: var(--accent-deep);
}
.chip-pct {
  font-size: 11px;
  color: var(--ink-2);
  font-weight: 500;
}
.chip-on {
  background: var(--accent);
  border-color: var(--accent);
}
.chip-on .chip-num, .chip-on .chip-pct { color: #fff; }
.conf-hints {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--ink-2);
  letter-spacing: -0.005em;
}
.dot-sep { opacity: 0.5; }

.q-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--rule-soft);
}
.q-actions-right { display: flex; align-items: center; gap: 18px; }

/* ============================================================
   RESULTS
   ============================================================ */
.results {
  max-width: 1100px;
  margin: 0 auto;
  padding: 56px 40px 96px;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 56px;
}
.results-empty {
  max-width: 560px;
  margin: 96px auto;
  text-align: left;
  padding: 0 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.results-head { max-width: 820px; }
.results-title {
  font-size: calc(56px * var(--font-scale));
  line-height: 1.05;
  letter-spacing: -0.025em;
  font-weight: 600;
  color: var(--accent-deep);
  margin: 12px 0 24px;
  text-wrap: balance;
}
.results-readout {
  font-size: calc(20px * var(--font-scale));
  line-height: 1.4;
  color: var(--ink);
  margin: 0;
  padding: 18px 22px 18px 26px;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  letter-spacing: -0.01em;
  font-weight: 500;
  max-width: 70ch;
  text-wrap: pretty;
}

.section-title {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
  font-weight: 600;
  margin: 0 0 14px;
}

/* Stats */
.results-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.stat {
  padding: 24px 24px;
  border-right: 1px solid var(--rule-soft);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.stat:last-child { border-right: none; }
.stat-num {
  font-family: 'Roboto Slab', Georgia, serif;
  font-weight: 500;
  font-size: calc(40px * var(--font-scale));
  letter-spacing: -0.025em;
  line-height: 1;
  color: var(--accent-deep);
}
.stat-lbl {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin-top: 6px;
}
.stat-hint {
  font-size: 11px;
  color: var(--ink-2);
  font-style: italic;
  margin-top: 2px;
}
body.hide-brier .stat-brier { display: none; }
body.hide-brier .results-stats { grid-template-columns: repeat(3, 1fr); }

/* Chart */
.chart-section {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 56px;
  align-items: start;
}
.chart-head { padding-top: 8px; }
.chart-cap {
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink);
  margin: 0 0 16px;
  max-width: 38ch;
}
.cal-chart { width: 100%; max-width: 620px; }
.cal-chart svg { width: 100%; height: auto; display: block; }

/* Bucket table */
.table-section {}
.table-wrap {
  border: 1px solid var(--rule);
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
}
.bucket-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.bucket-table thead th {
  text-align: left;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
  font-weight: 600;
  padding: 14px 18px;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}
.bucket-table tbody td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--rule-soft);
  color: var(--ink);
  font-weight: 500;
  vertical-align: middle;
}
.bucket-table tbody tr:last-child td { border-bottom: none; }
.td-conf { width: 1%; }
.conf-pill {
  display: inline-block;
  padding: 4px 10px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  border-radius: 999px;
  font-family: 'Roboto Slab', Georgia, serif;
  font-weight: 500;
  font-size: 13px;
}
.td-actual { width: 50%; }
.bar-cell { display: flex; align-items: center; gap: 12px; }
.bar-cell-track {
  position: relative;
  flex: 1;
  height: 8px;
  background: var(--rule-soft);
  border-radius: 999px;
  overflow: visible;
}
.bar-cell-fill {
  position: absolute;
  inset: 0 auto 0 0;
  background: var(--accent);
  border-radius: 999px;
  transition: width var(--dur-med) var(--ease-standard);
}
.bar-cell-target {
  position: absolute;
  top: -3px;
  width: 2px;
  height: 14px;
  background: var(--accent-deep);
  transform: translateX(-1px);
}
.bar-cell-num {
  font-family: 'Roboto Slab', Georgia, serif;
  font-weight: 500;
  width: 44px;
  text-align: right;
  color: var(--accent-deep);
  font-size: 13px;
}
.td-diff { font-family: 'Roboto Slab', Georgia, serif; font-weight: 500; width: 1%; white-space: nowrap; }
.d-pos { color: #2c7a4b; }
.d-neg { color: #b14a3a; }
.d-near { color: var(--ink-2); }

/* Missed */
.missed-section {}
.missed-toggle {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 10px 18px 10px 12px;
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  font-weight: 500;
  color: var(--accent-deep);
  transition: border-color var(--dur-fast) var(--ease-standard);
}
.missed-toggle:hover { border-color: var(--accent); }
.m-count {
  display: inline-grid;
  place-items: center;
  min-width: 26px; height: 26px;
  background: var(--accent);
  color: #fff;
  border-radius: 999px;
  font-family: 'Roboto Slab', Georgia, serif;
  font-weight: 500;
  font-size: 12px;
  padding: 0 8px;
}
.m-arrow { color: var(--ink-2); font-size: 16px; line-height: 1; }
.missed-list {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--rule);
}
.missed-item {
  padding: 24px 0;
  border-bottom: 1px solid var(--rule-soft);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.missed-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.missed-num {
  font-family: 'Roboto Slab', Georgia, serif;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0;
  font-size: 13px;
}
.missed-conf {
  font-family: 'Roboto Slab', Georgia, serif;
  font-weight: 500;
  color: var(--accent-deep);
  letter-spacing: 0;
  font-size: 12px;
  background: var(--accent-soft);
  padding: 2px 8px;
  border-radius: 999px;
}
.missed-q {
  font-size: calc(18px * var(--font-scale));
  line-height: 1.35;
  color: var(--accent-deep);
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.missed-options {
  font-size: 13px;
  color: var(--ink-2);
  margin: 0;
}
.opt-sep { opacity: 0.5; padding: 0 4px; }
.missed-rows {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 4px 0;
}
.missed-row {
  display: flex;
  flex-direction: column;
  padding: 10px 14px;
  border-radius: 6px;
  border: 1px solid var(--rule-soft);
  background: var(--paper-2);
}
.mr-yours { background: rgba(177, 74, 58, 0.06); border-color: rgba(177, 74, 58, 0.18); }
.mr-correct { background: rgba(44, 122, 75, 0.06); border-color: rgba(44, 122, 75, 0.18); }
.mr-lbl {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
  font-weight: 600;
}
.mr-val {
  font-size: 14px;
  color: var(--ink);
  font-weight: 500;
  margin-top: 2px;
}
.mr-yours .mr-val { color: #8a3729; }
.mr-correct .mr-val { color: #1f5b37; }
.missed-explain {
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.55;
  margin: 4px 0 0;
  max-width: 70ch;
}

.results-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
}

/* ============================================================
   TWEAKS
   ============================================================ */
.tweaks-panel {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 320px;
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 8px;
  box-shadow: 0 12px 40px rgba(14,135,156,0.18);
  padding: 0;
  z-index: 1000;
  font-size: 13px;
}
.tweaks-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--rule-soft);
}
.tweaks-title {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--accent);
}
.tweaks-close {
  background: none; border: 0; cursor: pointer; font-size: 22px;
  line-height: 1; color: var(--ink-2);
}
.tweaks-section {
  padding: 14px 18px;
  border-bottom: 1px solid var(--rule-soft);
  display: flex; flex-direction: column; gap: 14px;
}
.tweaks-section:last-of-type { border-bottom: none; }
.tweak-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.tweak-lbl { color: var(--ink); font-weight: 500; }
.tweak-radio { flex-direction: column; align-items: flex-start; gap: 8px; }
.seg-radio {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 0;
  width: 100%;
  border: 1px solid var(--rule);
  border-radius: 6px;
  overflow: hidden;
}
.seg-radio-btn {
  background: #fff; border: 0; padding: 8px 0;
  font: inherit; font-size: 12px; cursor: pointer;
  border-right: 1px solid var(--rule-soft);
  color: var(--ink-2);
  transition: background var(--dur-fast) var(--ease-standard);
}
.seg-radio-btn:last-child { border-right: 0; }
.seg-radio-btn.on { background: var(--accent); color: #fff; }
.tweak-row input[type="range"] { width: 140px; accent-color: var(--accent); }
.tweak-row input[type="checkbox"] { accent-color: var(--accent); width: 16px; height: 16px; }
.tweaks-foot {
  padding: 12px 18px;
  font-size: 11px;
  color: var(--ink-2);
  font-style: italic;
  margin: 0;
  border-top: 1px solid var(--rule-soft);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 880px) {
  .app-header, .app-foot { padding-left: 24px; padding-right: 24px; }
  .intro { padding: 56px 24px 64px; }
  .intro-grid { grid-template-columns: 1fr; gap: 40px; }
  .intro-title { font-size: calc(44px * var(--font-scale)); }
  .question { padding: 24px 20px 36px; gap: 20px; }
  .q-text { font-size: calc(26px * var(--font-scale)); }
  .answers { grid-template-columns: 1fr; }
  .conf-chips { grid-template-columns: repeat(5, 1fr); gap: 6px; }
  .chip { padding: 12px 2px; }
  .chip-num { font-size: calc(17px * var(--font-scale)); }
  .results { padding: 36px 24px 64px; gap: 40px; }
  .results-title { font-size: calc(36px * var(--font-scale)); }
  .results-readout { font-size: calc(16px * var(--font-scale)); }
  .results-stats { grid-template-columns: repeat(2, 1fr); border: 1px solid var(--rule); border-radius: 8px; }
  body.hide-brier .results-stats { grid-template-columns: repeat(3, 1fr); }
  .stat { padding: 18px; border-right: 1px solid var(--rule-soft); border-bottom: 1px solid var(--rule-soft); }
  .stat:nth-child(2n) { border-right: none; }
  .stat:nth-last-child(-n+2) { border-bottom: none; }
  .chart-section { grid-template-columns: 1fr; gap: 24px; }
  .missed-rows { grid-template-columns: 1fr; }
  .tweaks-panel { left: 16px; right: 16px; width: auto; bottom: 16px; }
}