/* ============================================================
 * Quiz portal — Editorial Lecture Hall stylesheet.
 *
 * Aesthetic: a calm, typographic, textbook-like surface for an in-class
 * live quiz. Source Serif 4 carries question prose; IBM Plex Sans is the
 * chrome face; IBM Plex Mono handles tabular numerics. One ink-blue
 * accent in light mode; brass-amber in dark mode.
 *
 * Class names align with admin.js and quiz.js. Behaviour is unchanged;
 * this file is purely visual.
 * ============================================================ */

@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&family=Source+Serif+4:opsz,wght@8..60,400;8..60,500;8..60,600;8..60,700&display=swap");

:root {
  color-scheme: light dark;

  /* Surfaces — warm paper, restrained */
  --bg: #f4efe6;
  --bg-grain: rgba(31, 29, 24, 0.018);
  --surface: #fdfbf6;
  --surface-2: #f8f3e8;
  --border: #d9d2c2;
  --border-strong: #1a1a1a;
  --rule: #1a1a1a;

  /* Ink */
  --text: #15171c;
  --text-soft: #2c2f38;
  --muted: #6a6760;
  --muted-2: #908b80;

  /* One accent — ink-blue */
  --primary: #1f3d6b;
  --primary-soft: #2e5292;
  --primary-text: #fbf7ec;
  --accent: #1f3d6b;

  /* Status */
  --warn: #8a5a14;
  --warn-text: #fbf7ec;
  --danger: #7a221c;
  --danger-text: #fbf7ec;
  --info: #1f3d6b;

  --correct-border: #4f6b35;
  --correct-bg: rgba(79, 107, 53, 0.08);
  --wrong-border: #7a221c;
  --wrong-bg: rgba(122, 34, 28, 0.08);

  /* Top-3 medals — subtle, restrained, but readable across a hall */
  --medal-gold: #a07a1f;
  --medal-silver: #595c66;
  --medal-bronze: #8a4a1f;

  --shadow-sm: 0 1px 0 rgba(20, 22, 28, 0.04);
  --shadow: 0 1px 0 rgba(20, 22, 28, 0.05), 0 12px 36px -20px rgba(20, 22, 28, 0.18);
  --shadow-strong: 0 1px 0 rgba(20, 22, 28, 0.06), 0 22px 48px -24px rgba(20, 22, 28, 0.28);

  /* Type system */
  --font-display: "Source Serif 4", "Source Serif Pro", ui-serif, Georgia, "Times New Roman", serif;
  --font-sans: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  font-feature-settings: "ss01", "ss02", "cv11";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100dvh;
  background:
    radial-gradient(1200px 700px at 100% -10%, color-mix(in srgb, var(--primary) 5%, transparent) 0%, transparent 60%),
    radial-gradient(900px 500px at -10% 110%, color-mix(in srgb, var(--primary) 4%, transparent) 0%, transparent 55%),
    var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: 0.005em;
}

::selection { background: color-mix(in srgb, var(--primary) 30%, transparent); color: var(--text); }

/* ---------- Headings & inline ---------- */

h1, h2, h3 { margin: 0 0 0.4rem; line-height: 1.15; }
h1 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: -0.012em;
  font-feature-settings: "ss01";
}
h2 {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
h3 {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 18px 0 10px;
}
p { margin: 0 0 0.6rem; }
code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  letter-spacing: -0.01em;
}

.muted { color: var(--muted); }
.small { font-size: 0.85rem; }
.eyebrow {
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-weight: 600;
  margin: 0 0 0.6rem;
}

/* ---------- Layout containers ---------- */

.bootstrap-loading {
  display: grid;
  place-items: center;
  min-height: 100dvh;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.bootstrap-loading::after {
  content: "";
  display: inline-block;
  width: 22px;
  height: 1px;
  background: var(--text);
  margin-left: 14px;
  animation: lineblink 1.1s ease-in-out infinite;
}
@keyframes lineblink {
  0%, 100% { opacity: 0.2; transform: scaleX(0.4); }
  50% { opacity: 1; transform: scaleX(1); }
}

.centered-shell {
  display: grid;
  place-items: center;
  min-height: 100dvh;
  padding: 24px 18px;
}

/* ---------- Cards & panels ---------- */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  box-shadow: var(--shadow);
  padding: 28px;
  position: relative;
}

.card.narrow { width: min(440px, 100%); }
.card-header { margin-bottom: 18px; }
.card-header h1 { margin-bottom: 6px; }
.card.center { text-align: center; }

.panel { padding: 22px 24px; }
.panel + .panel { margin-top: 16px; }

.panel h2 .count {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 1px 8px;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  letter-spacing: 0;
  font-weight: 500;
  margin-left: auto;
}

.stack { display: grid; gap: 16px; }

/* ---------- Forms ---------- */

.field { display: grid; gap: 8px; }
.field > span {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

input, textarea, select {
  font: inherit;
  font-family: var(--font-sans);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 11px 14px;
  background: var(--surface);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
input:focus, textarea:focus, select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 18%, transparent);
}

/* ---------- Buttons ---------- */

.btn, button {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  border: 1px solid var(--border-strong);
  border-radius: 2px;
  padding: 10px 18px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition:
    transform 0.08s ease,
    background 0.18s ease,
    color 0.18s ease,
    border-color 0.18s ease,
    box-shadow 0.18s ease;
}
.btn:hover:not(:disabled), button:hover:not(:disabled) {
  background: var(--text);
  color: var(--surface);
}
.btn:active, button:active { transform: translateY(1px); }
.btn:disabled, button:disabled { cursor: not-allowed; opacity: 0.45; }
.btn:focus-visible, button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 35%, transparent);
}

.btn.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-text);
}
.btn.primary:hover:not(:disabled) {
  background: var(--text);
  border-color: var(--text);
  color: var(--surface);
}
.btn.warn {
  background: var(--surface);
  border-color: var(--warn);
  color: var(--warn);
}
.btn.warn:hover:not(:disabled) {
  background: var(--warn);
  color: var(--warn-text);
}
.btn.danger {
  background: var(--danger);
  border-color: var(--danger);
  color: var(--danger-text);
}
.btn.danger:hover:not(:disabled) {
  background: var(--text);
  border-color: var(--text);
  color: var(--surface);
}
.btn.ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text-soft);
}
.btn.ghost:hover:not(:disabled) {
  background: transparent;
  border-color: var(--text);
  color: var(--text);
}
.btn.block { width: 100%; }
.btn.big {
  padding: 14px 26px;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.btn.small { padding: 6px 12px; font-size: 0.75rem; letter-spacing: 0.06em; text-transform: uppercase; }

/* ---------- Alerts ---------- */

.alert {
  padding: 12px 18px;
  border-radius: 2px;
  font-size: 0.88rem;
  border-left: 3px solid var(--border);
  background: var(--surface);
  margin: 0 24px 16px;
}
.alert.error { border-left-color: var(--danger); color: var(--danger); background: var(--wrong-bg); }
.alert.error { margin: 0; }
.alert.info { border-left-color: var(--primary); color: var(--primary); background: color-mix(in srgb, var(--primary) 5%, transparent); }

/* ---------- Admin topbar ---------- */

.admin-body { padding-bottom: 32px; }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  padding: 28px 32px 18px;
  border-bottom: 1px solid var(--rule);
  flex-wrap: wrap;
  position: relative;
}
.topbar::before {
  content: "Live Quiz";
  position: absolute;
  top: 18px;
  left: 32px;
  font-family: var(--font-sans);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--muted-2);
}
.topbar-title { padding-top: 18px; }
.topbar-title h1 {
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 600;
  letter-spacing: -0.012em;
  margin-bottom: 4px;
}
.topbar-title p {
  margin: 0;
  font-size: 0.82rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}
.topbar-actions { display: flex; gap: 12px; align-items: center; }

/* State badge — readable across a lecture hall */
.state-badge {
  border-radius: 0;
  padding: 7px 14px;
  font-size: 0.72rem;
  font-family: var(--font-sans);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.state-badge::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--muted);
  flex-shrink: 0;
}
.state-badge.state-lobby::before { background: var(--muted); }
.state-badge.state-question_open {
  background: var(--primary);
  color: var(--primary-text);
  border-color: var(--primary);
}
.state-badge.state-question_open::before {
  background: var(--primary-text);
  animation: pulse 1.4s ease-in-out infinite;
}
.state-badge.state-question_closed::before { background: var(--warn); }
.state-badge.state-finished::before { background: var(--correct-border); }
.state-badge.state-correct {
  background: var(--correct-bg);
  color: var(--correct-border);
  border-color: var(--correct-border);
}
.state-badge.state-correct::before { background: var(--correct-border); }
.state-badge.state-wrong {
  background: var(--wrong-bg);
  color: var(--danger);
  border-color: var(--danger);
}
.state-badge.state-wrong::before { background: var(--danger); }

@keyframes pulse {
  0%, 100% { opacity: 0.45; transform: scale(0.85); }
  50% { opacity: 1; transform: scale(1.15); }
}

/* ---------- Admin dashboard layout ---------- */

.dashboard {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(300px, 380px) 1fr;
  padding: 22px 32px;
  align-items: start;
}
@media (max-width: 900px) {
  .dashboard { grid-template-columns: 1fr; padding: 18px; }
  .topbar { padding: 26px 18px 16px; }
  .topbar::before { left: 18px; }
}

.dashboard-side { display: grid; gap: 18px; }
.dashboard-main { display: grid; gap: 18px; }

/* ---------- Join panel (QR + URL + roster) ---------- */

.join-panel { padding: 0; overflow: hidden; }
.join-panel h2 {
  margin: 0;
  padding: 18px 22px 14px;
  border-bottom: 1px solid var(--rule);
}
.join-panel h2::before {
  content: "01";
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted-2);
  letter-spacing: 0;
  margin-right: 4px;
}

.qr-wrap {
  background: #ffffff;
  padding: 18px;
  border: 0;
  border-bottom: 1px solid var(--rule);
  display: grid;
  place-items: center;
  margin: 0;
  position: relative;
}
.qr-wrap::before {
  content: "Scan to join";
  position: absolute;
  top: 14px;
  left: 18px;
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: #2c2f38;
  font-weight: 600;
}
.qr-wrap img {
  width: 100%;
  height: auto;
  max-width: 260px;
  display: block;
  margin-top: 18px;
  image-rendering: pixelated;
}
.qr-fallback { padding: 40px; color: var(--muted); }

.join-url-row {
  display: flex;
  gap: 10px;
  align-items: stretch;
  padding: 14px 22px;
  border-bottom: 1px solid var(--border);
}
.join-url {
  flex: 1 1 200px;
  background: var(--surface-2);
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  word-break: break-all;
  color: var(--text);
  display: flex;
  align-items: center;
}
.join-panel .small {
  padding: 10px 22px 18px;
  margin: 0;
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.join-panel .small code {
  background: var(--surface-2);
  padding: 1px 6px;
  border: 1px solid var(--border);
  border-radius: 2px;
}

.roster {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  max-height: 380px;
  overflow-y: auto;
}
.roster li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dotted var(--border);
  animation: rosterIn 0.35s ease both;
}
.roster li:last-child { border-bottom: none; }
.roster .dot {
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--muted-2);
  flex-shrink: 0;
  transition: background 0.5s ease, box-shadow 0.5s ease;
}
.roster li.is-fresh .dot {
  background: var(--correct-border);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--correct-border) 22%, transparent);
}
.roster li.is-fresh:first-child .dot {
  /* Newest-first emphasis — soft pulsing halo on the top row only. */
  animation: rosterDotPulse 2.2s ease-in-out infinite;
}
.roster .who { display: grid; line-height: 1.25; }
.roster .who b { font-weight: 500; font-size: 0.95rem; }
.roster .who small {
  color: var(--muted);
  font-size: 0.74rem;
  font-family: var(--font-mono);
  letter-spacing: 0;
}
@keyframes rosterIn {
  from { opacity: 0; transform: translateX(-6px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes rosterDotPulse {
  0%, 100% { box-shadow: 0 0 0 2px color-mix(in srgb, var(--correct-border) 22%, transparent); }
  50%      { box-shadow: 0 0 0 5px color-mix(in srgb, var(--correct-border) 12%, transparent); }
}

/* ---------- State CTA panel (lobby / finished) ----------
 * The right column gets editorial weight here so the page doesn't read
 * empty before the quiz starts (or after it ends). */

.state-cta { display: grid; gap: 14px; }
.state-cta h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 2.4vw, 2.1rem);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.014em;
  text-transform: none;
  color: var(--text);
  border-bottom: 0;
  padding-bottom: 0;
  margin-bottom: 2px;
}
.state-cta p {
  font-family: var(--font-display);
  font-size: 1.02rem;
  color: var(--text-soft);
  line-height: 1.55;
  max-width: 60ch;
}
.state-cta .cta-eyebrow {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 -6px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  max-width: none;
}
.state-cta .cta-num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0;
  color: var(--muted-2);
}
.state-cta .btn.big { justify-self: start; margin-top: 14px; }

/* Inline numeric stats inside a CTA panel — gives the lobby/finished
 * card visual mass without needing a hero illustration. Cap the strip
 * width so it stays a coherent eye-block on a 1920px projector. */
.cta-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 14px 0 4px;
  max-width: 580px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.cta-stat {
  flex: 1 1 0;
  min-width: 110px;
  padding: 14px 18px;
  border-right: 1px dotted var(--border);
}
.cta-stat:first-child { padding-left: 0; }
.cta-stat:last-child { border-right: 0; padding-right: 0; }
.cta-stat span {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
.cta-stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  margin-top: 6px;
  color: var(--text);
}
.cta-stat b small {
  font-size: 0.78rem;
  margin-left: 2px;
  color: var(--muted);
  letter-spacing: 0;
}

.action-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

/* ---------- Question card (admin + student share) ---------- */

.question-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.qnum {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.countdown {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1.5rem;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  letter-spacing: -0.02em;
}
.countdown.urgent {
  color: var(--danger);
  animation: urgent-blink 0.8s ease-in-out infinite;
}
@keyframes urgent-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.55; }
}

.qbar {
  height: 3px;
  background: var(--surface-2);
  border-radius: 0;
  overflow: hidden;
  margin-bottom: 22px;
  position: relative;
}
.qbar span {
  display: block;
  height: 100%;
  width: 100%;
  background: var(--primary);
  transition: width 0.25s linear;
  transform-origin: left center;
}
.qbar::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 0%, color-mix(in srgb, var(--primary) 40%, transparent) 50%, transparent 100%);
  animation: barbreath 2.4s ease-in-out infinite;
  pointer-events: none;
  mix-blend-mode: overlay;
  opacity: 0.35;
}
@keyframes barbreath {
  0%, 100% { transform: translateX(-30%); }
  50% { transform: translateX(30%); }
}

.question-text,
h2.question-text,
h1.question-text {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.4vw, 1.95rem);
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.008em;
  text-transform: none;
  margin: 14px 0 24px;
  color: var(--text);
  max-width: 60ch;
  border-bottom: 0;
  padding-bottom: 0;
  display: block;
}
.question-text.small,
h2.question-text.small {
  font-size: 1.2rem;
  font-weight: 500;
  margin: 10px 0 16px;
}

.options {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
  counter-reset: option;
}
.options li {
  display: grid;
  grid-template-columns: 32px 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 12px 16px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 2px;
  transition: border-color 0.18s ease, background 0.18s ease;
}
.options .key {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.92rem;
  letter-spacing: 0;
  text-align: left;
  width: auto;
  color: var(--muted);
  background: transparent;
  padding: 0;
  border-right: 1px solid var(--border);
  padding-right: 14px;
  height: 22px;
  display: inline-flex;
  align-items: center;
}
.options .opt-text {
  color: var(--text);
  font-family: var(--font-display);
  font-size: 1.02rem;
  line-height: 1.4;
}
.options .opt-count {
  color: var(--muted);
  font-size: 0.78rem;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.options.reveal li.correct {
  background: var(--correct-bg);
  border-color: var(--correct-border);
  animation: correctDraw 0.5s ease both;
}
.options.reveal li.correct .key { color: var(--correct-border); border-right-color: var(--correct-border); }
.options.reveal li.wrong-pick {
  border-color: var(--wrong-border);
  background: var(--wrong-bg);
}
.options.reveal li.wrong-pick .key { color: var(--wrong-border); border-right-color: var(--wrong-border); }

@keyframes correctDraw {
  0% { box-shadow: inset 0 0 0 0 var(--correct-border); }
  60% { box-shadow: inset 0 0 0 2px var(--correct-border); }
  100% { box-shadow: inset 0 0 0 0 var(--correct-border); }
}

.explanation {
  background: transparent;
  padding: 14px 18px;
  border-radius: 0;
  border: 0;
  border-left: 2px solid var(--primary);
  margin-top: 18px;
  font-size: 0.98rem;
  font-family: var(--font-display);
  font-style: italic;
  color: var(--text-soft);
  line-height: 1.5;
  max-width: 62ch;
}

/* ---------- Histogram ---------- */

.hist { margin-top: 22px; display: grid; gap: 10px; }
.hist::before {
  content: "Live distribution";
  font-family: var(--font-sans);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}
.hist.final::before { content: "Final distribution"; }
.hist-summary {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  padding-bottom: 6px;
}
.hist-summary b { color: var(--text); font-weight: 600; }
.hist-awaiting {
  margin: 4px 0 0;
  padding: 0;
  font-style: italic;
  color: var(--muted);
}
.hist-rows { display: grid; gap: 6px; }
.hist-row {
  display: grid;
  grid-template-columns: 22px 1fr 90px;
  gap: 12px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}
.hist-row .key {
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0;
  font-family: var(--font-mono);
  background: transparent;
  border: 0;
  padding: 0;
  width: auto;
  text-align: left;
}
.hist-row .bar {
  height: 6px;
  background: var(--surface-2);
  border-radius: 0;
  overflow: hidden;
  border: 1px solid var(--border);
}
.hist-row .bar .fill {
  display: block;
  height: 100%;
  background: var(--primary);
  transition: width 0.45s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.hist-row.is-correct .bar .fill { background: var(--correct-border); }
.hist-row.is-correct .key { color: var(--correct-border); }
.hist-row.missed .bar { background: transparent; border-color: transparent; }
.hist-row.missed .key { color: var(--muted-2); }
.hist-row .num {
  font-size: 0.78rem;
  text-align: right;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* ---------- Leaderboard ---------- */

.leaderboard {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--border);
}
.leaderboard li {
  display: grid;
  grid-template-columns: 36px 1fr auto;
  gap: 14px;
  align-items: center;
  /* Reserve the 3px medal stripe space on every row so rank columns align. */
  padding: 10px 12px 10px 15px;
  border-radius: 0;
  border-left: 3px solid transparent;
  border-bottom: 1px solid var(--border);
  position: relative;
  transition: background 0.18s ease;
}
.leaderboard li:nth-child(even) { background: var(--surface-2); }
.leaderboard li:hover { background: color-mix(in srgb, var(--primary) 6%, transparent); }
.leaderboard .rank {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  font-size: 0.85rem;
  letter-spacing: 0;
  text-align: right;
  padding-right: 6px;
}
.leaderboard .who { display: grid; line-height: 1.2; min-width: 0; }
.leaderboard .who b {
  font-weight: 500;
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--text);
  letter-spacing: -0.005em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.leaderboard .who small {
  color: var(--muted);
  font-size: 0.72rem;
  font-family: var(--font-mono);
  letter-spacing: 0;
}
.leaderboard .score {
  font-family: var(--font-mono);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

/* Top-3 medal treatment — colored stripe + tinted plate. Stripe width is
 * already reserved on every row, so rank columns stay aligned. */
.leaderboard li:nth-child(1) { border-left-color: var(--medal-gold);   background: color-mix(in srgb, var(--medal-gold) 9%, var(--surface)); }
.leaderboard li:nth-child(2) { border-left-color: var(--medal-silver); background: color-mix(in srgb, var(--medal-silver) 9%, var(--surface)); }
.leaderboard li:nth-child(3) { border-left-color: var(--medal-bronze); background: color-mix(in srgb, var(--medal-bronze) 9%, var(--surface)); }
.leaderboard li:nth-child(1) .rank { color: var(--medal-gold); }
.leaderboard li:nth-child(2) .rank { color: var(--medal-silver); }
.leaderboard li:nth-child(3) .rank { color: var(--medal-bronze); }
.leaderboard li:nth-child(1) .score,
.leaderboard li:nth-child(2) .score,
.leaderboard li:nth-child(3) .score {
  font-weight: 600;
}

/* "That's me" highlight on the student leaderboard. Blue stripe + name
 * recolour + small inline "you" tag below the name. The tag rides the
 * existing grid row of .who so it never collides with the score. */
.leaderboard li.is-you {
  background: color-mix(in srgb, var(--primary) 10%, var(--surface));
  border-left-color: var(--primary);
}
.leaderboard li.is-you .who { gap: 1px; }
.leaderboard li.is-you .who b { color: var(--primary); font-weight: 600; }
.leaderboard li.is-you .who::after {
  content: "you";
  font-family: var(--font-sans);
  font-size: 0.58rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--primary);
  font-weight: 600;
  opacity: 0.85;
}
.leaderboard li.is-you .score { color: var(--primary); }
.leaderboard li.is-you:nth-child(1),
.leaderboard li.is-you:nth-child(2),
.leaderboard li.is-you:nth-child(3) {
  /* When the student IS on the podium, keep the medal stripe; brighten
   * the row tint so they still read as "you". */
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--primary) 12%, transparent), color-mix(in srgb, var(--primary) 6%, transparent)),
    var(--surface);
}

/* ---------- Student-side answer buttons ---------- */

.quiz-card { width: min(680px, 100%); padding: 28px 30px 32px; }

.answer-grid {
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
}
.answer-btn {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 18px;
  align-items: center;
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 2px;
  padding: 18px 20px;
  font-size: 1rem;
  min-height: 64px;
  font-family: var(--font-sans);
  font-weight: 500;
  color: var(--text);
  position: relative;
  transition:
    transform 0.12s cubic-bezier(0.22, 0.61, 0.36, 1),
    background 0.18s ease,
    border-color 0.18s ease,
    color 0.18s ease;
}
.answer-btn:hover:not(:disabled) {
  background: var(--text);
  color: var(--surface);
  border-color: var(--text);
}
.answer-btn:hover:not(:disabled) .answer-key {
  color: var(--surface);
  border-right-color: var(--surface);
}
.answer-btn.picked {
  background: var(--primary);
  color: var(--primary-text);
  border-color: var(--primary);
  animation: pickSettle 0.32s cubic-bezier(0.22, 1.4, 0.36, 1) both;
}
.answer-btn.picked .answer-key {
  color: var(--primary-text);
  border-right-color: color-mix(in srgb, var(--primary-text) 40%, transparent);
}
@keyframes pickSettle {
  0% { transform: scale(1); }
  35% { transform: scale(0.97); }
  100% { transform: scale(1); }
}

.answer-btn .answer-key {
  font-family: var(--font-mono);
  font-weight: 600;
  border: 0;
  border-right: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  padding: 0 14px 0 0;
  text-align: left;
  width: auto;
  font-size: 1.05rem;
  letter-spacing: 0;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  transition: color 0.18s ease, border-right-color 0.18s ease;
}
.answer-btn .answer-text {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.1rem;
  line-height: 1.35;
}

.big-score {
  font-family: var(--font-mono);
  font-size: 4.2rem;
  font-weight: 500;
  color: var(--text);
  margin: 14px 0 6px;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.04em;
  line-height: 1;
}

.spinner {
  width: 22px;
  height: 22px;
  margin: 18px auto 0;
  border: 1.5px solid var(--border);
  border-top-color: var(--text);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Reveal stats (student) ---------- */

.reveal-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin: 20px 0 6px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.reveal-stats .stat {
  text-align: center;
  padding: 14px 8px;
  background: transparent;
  border-radius: 0;
  border-right: 1px dotted var(--border);
}
.reveal-stats .stat:last-child { border-right: 0; }
.reveal-stats .stat span {
  display: block;
  font-size: 0.66rem;
  color: var(--muted);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 600;
}
.reveal-stats .stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 500;
  margin-top: 6px;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  color: var(--text);
}
.reveal-stats .stat.big b {
  font-size: 2.6rem;
  color: var(--primary);
}

.celebration-card {
  text-align: center;
  width: min(680px, 100%);
  position: relative;
  padding: 32px 30px 36px;
}
.celebration-banner {
  background: transparent;
  color: var(--text);
  padding: 0 0 18px;
  border-radius: 0;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.7rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  margin: -8px 0 14px;
  border-bottom: 1px solid var(--rule);
  position: relative;
}
.celebration-banner::before,
.celebration-banner::after {
  content: "—";
  display: inline-block;
  padding: 0 14px;
  color: var(--muted-2);
  font-weight: 400;
  letter-spacing: 0;
}
.celebration-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  text-transform: none;
  letter-spacing: -0.005em;
  color: var(--text);
  margin-top: 24px;
}

/* ---------- Student-specific reveal trims ----------
 * The "Your pick" tag sits as a thin top-edge ribbon so it can't collide
 * with the count column on narrow phones. */

.options.student-reveal li.yours {
  position: relative;
  padding-top: 22px;
}
.options.student-reveal li.yours::before {
  content: "Your pick";
  position: absolute;
  top: 4px;
  left: 16px;
  font-family: var(--font-sans);
  font-size: 0.58rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}
.options.student-reveal li.yours.correct::before { color: var(--correct-border); }
.options.student-reveal li.yours.wrong-pick::before { color: var(--wrong-border); }

/* ---------- Responsive: mobile student view ---------- */

@media (max-width: 480px) {
  body { font-size: 15px; }
  .card { padding: 22px 18px; }
  .panel { padding: 18px 16px; }
  .quiz-card, .celebration-card { padding: 24px 20px; }
  .question-text { font-size: 1.4rem; }
  .answer-btn .answer-text { font-size: 1.02rem; }
  .answer-btn { padding: 16px; min-height: 60px; }
  .topbar { padding: 24px 16px 14px; }
  .topbar::before { left: 16px; }
  .dashboard { padding: 16px; }
  .reveal-stats .stat b { font-size: 1.25rem; }
  .reveal-stats .stat.big b { font-size: 2rem; }
  .big-score { font-size: 3.4rem; }
  h2 { font-size: 0.72rem; }
}

@media (max-width: 360px) {
  .answer-btn { grid-template-columns: 28px 1fr; gap: 12px; padding: 14px; }
  .answer-btn .answer-text { font-size: 0.96rem; }
}

/* ---------- Dark mode: inkwell + brass ---------- */

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c1018;
    --surface: #131828;
    --surface-2: #181f33;
    --border: #2a3145;
    --border-strong: #4a526a;
    --rule: #404867;

    --text: #ece7d6;
    --text-soft: #d6d1c0;
    --muted: #8d8a82;
    --muted-2: #5e6377;

    --primary: #c79a4a;          /* brass */
    --primary-soft: #d8b06a;
    --primary-text: #15171c;
    --accent: #c79a4a;
    --info: #c79a4a;

    --warn: #d8a84a;
    --warn-text: #15171c;
    --danger: #d36556;
    --danger-text: #15171c;

    --correct-border: #8db96b;
    --correct-bg: rgba(141, 185, 107, 0.10);
    --wrong-border: #d36556;
    --wrong-bg: rgba(211, 101, 86, 0.10);

    --medal-gold: #e1bd72;
    --medal-silver: #c2c6d3;
    --medal-bronze: #d99165;

    --shadow-sm: 0 1px 0 rgba(0, 0, 0, 0.4);
    --shadow: 0 1px 0 rgba(0, 0, 0, 0.5), 0 16px 38px -22px rgba(0, 0, 0, 0.7);
    --shadow-strong: 0 1px 0 rgba(0, 0, 0, 0.6), 0 24px 50px -24px rgba(0, 0, 0, 0.85);
  }
  body {
    background:
      radial-gradient(1200px 700px at 100% -10%, color-mix(in srgb, var(--primary) 8%, transparent) 0%, transparent 60%),
      radial-gradient(900px 500px at -10% 110%, color-mix(in srgb, var(--primary) 5%, transparent) 0%, transparent 55%),
      var(--bg);
  }
  .qr-wrap { background: #f6f1e2; }
  .qr-wrap::before { color: #2c2f38; }
  .join-url { background: var(--surface-2); border-color: var(--border); color: var(--text); }
  .leaderboard li:nth-child(even) { background: color-mix(in srgb, var(--surface-2) 80%, transparent); }

  .btn:hover:not(:disabled), button:hover:not(:disabled) {
    background: var(--text);
    color: var(--surface);
    border-color: var(--text);
  }
  .btn.primary:hover:not(:disabled) {
    background: var(--primary-soft);
    border-color: var(--primary-soft);
    color: var(--primary-text);
  }
  .answer-btn:hover:not(:disabled) {
    background: var(--text);
    color: var(--surface);
    border-color: var(--text);
  }
  .answer-btn.picked {
    background: var(--primary);
    color: var(--primary-text);
    border-color: var(--primary);
  }
}

/* Honour reduced-motion preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}