:root {
  --paper-bg: #f7f1e7;
  --ink-900: #15324a;
  --ink-700: #2f4f66;
  --ink-500: #5a7286;
  --accent-700: #8a673d;
  --accent-500: #b68c57;
  --accent-200: #ead7b9;
  --success-700: #2c6a3a;
  --success-100: rgba(49, 124, 67, 0.12);
  --danger-700: #8a3226;
  --danger-100: rgba(170, 69, 54, 0.12);
  --border-soft: rgba(21, 50, 74, 0.12);
  --shadow-soft: 0 22px 46px rgba(21, 50, 74, 0.08);
  --shadow-pill: 0 10px 24px rgba(21, 50, 74, 0.08);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top right, rgba(182, 140, 87, 0.14), transparent 24rem),
    linear-gradient(180deg, #fcf8f2 0%, var(--paper-bg) 100%);
  color: var(--ink-900);
  font-family: "Source Sans 3", sans-serif;
}

button,
input,
label {
  font: inherit;
}

.demo-shell {
  width: min(1200px, calc(100vw - 2.5rem));
  margin: 0 auto;
  padding: 2.5rem 0 4rem;
}

.demo-header {
  text-align: center;
  padding: 0 0 2rem;
}

.demo-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1rem;
  color: var(--ink-700);
  text-decoration: none;
  font-weight: 600;
}

.demo-kicker,
.demo-section-kicker {
  margin: 0 0 0.55rem;
  color: var(--accent-700);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

.demo-header h1 {
  margin: 0;
  color: var(--ink-900);
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(2.4rem, 4vw, 3.7rem);
  line-height: 0.96;
}

.demo-subtitle,
.demo-intro {
  width: min(800px, 100%);
  margin: 0.85rem auto 0;
  color: var(--ink-700);
  font-size: 1.05rem;
  line-height: 1.7;
}

.demo-summary-pills,
.demo-quiz-stats {
  display: flex;
  justify-content: center;
  gap: 0.65rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.demo-summary-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.46rem 0.86rem;
  border-radius: 999px;
  background: rgba(234, 215, 185, 0.42);
  border: 1px solid rgba(182, 140, 87, 0.22);
  color: var(--ink-700);
  font-weight: 700;
}

.demo-panel {
  background: rgba(255, 250, 244, 0.9);
  border: 1px solid var(--border-soft);
  border-radius: 1.8rem;
  box-shadow: var(--shadow-soft);
  padding: 1.35rem;
}

.demo-toolbar,
.demo-toolbar-meta,
.demo-actions,
.demo-model-selector,
.demo-section-head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.demo-toolbar {
  justify-content: space-between;
  gap: 1rem;
}

.demo-toolbar-meta {
  color: var(--ink-500);
  font-size: 0.96rem;
  font-weight: 600;
}

.demo-index {
  color: var(--ink-500);
  font-weight: 600;
}

.demo-mode-tabs {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  padding: 0.24rem;
  border-radius: 999px;
  background: rgba(21, 50, 74, 0.06);
  border: 1px solid rgba(21, 50, 74, 0.08);
}

.demo-mode-tab,
.demo-actions button,
.demo-model-pill {
  border: 1px solid rgba(21, 50, 74, 0.12);
  border-radius: 999px;
  padding: 0.62rem 1rem;
  background: #fff;
  color: var(--ink-900);
  cursor: pointer;
  box-shadow: var(--shadow-pill);
  font-weight: 700;
}

.demo-mode-tab {
  min-width: 7rem;
  border-color: transparent;
  box-shadow: none;
  background: transparent;
  color: var(--ink-700);
}

.demo-mode-tab.is-active {
  background: #fff;
  color: var(--ink-900);
  border-color: rgba(182, 140, 87, 0.35);
  box-shadow: var(--shadow-pill);
}

.demo-actions button:hover,
.demo-model-pill:hover {
  border-color: rgba(182, 140, 87, 0.45);
  transform: translateY(-1px);
}

.demo-stage {
  margin-top: 1.15rem;
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid var(--border-soft);
  border-radius: 1.4rem;
  padding: 1.1rem;
}

.demo-stage-layout {
  display: grid;
  grid-template-columns: minmax(0, var(--demo-stage-media-width, 50%)) minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}

.demo-stage-media,
.demo-stage-copy {
  min-width: 0;
}

.demo-media {
  display: grid;
  gap: 0.9rem;
}

.demo-media-card {
  background: #fff;
  border: 1px solid rgba(21, 50, 74, 0.08);
  border-radius: 1.2rem;
  overflow: hidden;
}

.demo-media-card img {
  display: block;
  width: 100%;
  height: auto;
  background: white;
}

.demo-media-caption {
  padding: 0.7rem 0.9rem 0.85rem;
  color: var(--ink-700);
  font-size: 0.96rem;
}

.demo-stage-copy {
  display: grid;
  gap: 0.75rem;
  align-content: start;
}

.demo-stage-answer {
  margin-top: 0.2rem;
}

.demo-stage-copy h2 {
  margin: 0;
  color: var(--ink-900);
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(1.9rem, 2.6vw, 2.5rem);
}

.demo-prompt {
  margin: 0;
  color: var(--ink-900);
  font-size: 1.06rem;
  line-height: 1.75;
}

.demo-mode-panel {
  margin-top: 1.15rem;
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid var(--border-soft);
  border-radius: 1.4rem;
  padding: 1.1rem;
  display: grid;
  gap: 1rem;
}

.demo-section-head {
  justify-content: space-between;
  align-items: flex-end;
}

.demo-section-head.compact {
  align-items: center;
}

.demo-section-head h3,
.demo-section-head h4 {
  margin: 0;
  color: var(--ink-900);
  font-family: "Cormorant Garamond", serif;
}

.demo-section-head h3 {
  font-size: 1.75rem;
}

.demo-section-head h4 {
  font-size: 1.35rem;
}

.demo-model-selector {
  justify-content: flex-end;
}

.demo-model-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.demo-model-pill input {
  margin: 0;
}

.compare-grid,
.demo-predictions {
  display: grid;
  gap: 0.85rem;
}

.compare-grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.single-card {
  grid-template-columns: 1fr;
}

.demo-prediction-card,
.demo-answer-card {
  background: #fff;
  border: 1px solid rgba(21, 50, 74, 0.08);
  border-radius: 1rem;
  padding: 0.95rem 1rem;
}

.demo-prediction-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.55rem;
}

.demo-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.58rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
}

.demo-badge.is-correct {
  background: var(--success-100);
  color: var(--success-700);
}

.demo-badge.is-incorrect {
  background: var(--danger-100);
  color: var(--danger-700);
}

.demo-badge.is-unknown {
  background: rgba(21, 50, 74, 0.08);
  color: var(--ink-700);
}

.demo-prediction-answer,
.demo-prediction-explanation {
  color: var(--ink-900);
  line-height: 1.6;
  white-space: pre-wrap;
}

.demo-prediction-explanation {
  margin-top: 0.45rem;
  color: var(--ink-700);
}

.demo-form {
  display: grid;
  gap: 1rem;
}

.demo-text-input {
  width: 100%;
  padding: 0.86rem 0.95rem;
  border: 1px solid rgba(21, 50, 74, 0.18);
  border-radius: 0.95rem;
  background: #fff;
  color: var(--ink-900);
}

.demo-choice-list {
  display: grid;
  gap: 0.75rem;
}

.demo-choice {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 0.86rem 0.95rem;
  border: 1px solid rgba(21, 50, 74, 0.12);
  border-radius: 1rem;
  background: #fff;
}

.demo-choice-label {
  min-width: 1.7rem;
  font-weight: 700;
  color: var(--accent-700);
}

.demo-actions--quiz {
  justify-content: flex-start;
}

.demo-feedback {
  border-radius: 1rem;
  padding: 0.85rem 0.95rem;
  font-weight: 700;
}

.demo-feedback.is-correct {
  background: var(--success-100);
  color: var(--success-700);
}

.demo-feedback.is-incorrect {
  background: var(--danger-100);
  color: var(--danger-700);
}

.demo-section {
  display: grid;
  gap: 0.7rem;
}

.demo-section h4 {
  margin: 0;
  color: var(--ink-900);
  font-size: 1rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

@media (max-width: 920px) {
  .demo-stage-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .demo-shell {
    width: min(100vw - 1.25rem, 100%);
    padding-top: 1.5rem;
  }

  .demo-panel {
    padding: 1rem;
  }

  .demo-toolbar {
    align-items: flex-start;
  }

  .demo-toolbar-meta {
    width: 100%;
    justify-content: space-between;
  }

  .demo-mode-tab {
    min-width: 5.75rem;
  }
}