:root {
  color-scheme: light;
  --bg: #f8f5ef;
  --panel: rgba(255, 255, 255, 0.92);
  --panel-strong: #ffffff;
  --text: #1f2937;
  --muted: #5b6677;
  --border: rgba(15, 23, 42, 0.12);
  --accent: #c2410c;
  --accent-soft: rgba(194, 65, 12, 0.12);
  --shadow: 0 24px 70px rgba(15, 23, 42, 0.12);
  font-family: Inter, "Segoe UI", system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #100d0a;
    --panel: rgba(22, 16, 12, 0.9);
    --panel-strong: #1c1510;
    --text: #f4ede5;
    --muted: #d1b8a6;
    --border: rgba(251, 191, 36, 0.16);
    --accent: #fb923c;
    --accent-soft: rgba(251, 146, 60, 0.16);
    --shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
  }
}

:root[data-theme='light'] {
  color-scheme: light;
}

:root[data-theme='dark'] {
  color-scheme: dark;
  --bg: #100d0a;
  --panel: rgba(22, 16, 12, 0.9);
  --panel-strong: #1c1510;
  --text: #f4ede5;
  --muted: #d1b8a6;
  --border: rgba(251, 191, 36, 0.16);
  --accent: #fb923c;
  --accent-soft: rgba(251, 146, 60, 0.16);
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(251, 146, 60, 0.16), transparent 32%),
    linear-gradient(180deg, var(--bg), color-mix(in srgb, var(--bg) 84%, #000 16%));
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

.site-shell {
  width: min(1160px, calc(100% - 1.25rem));
  margin: 0 auto;
  padding: 1rem 0 1.75rem;
}

.site-header,
.panel {
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.site-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.eyebrow {
  margin: 0 0 0.35rem;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

h1,
 h2,
 h3,
 p {
  margin-top: 0;
}

.subtitle,
.helper-text,
.muted {
  color: var(--muted);
}

.layout {
  display: grid;
  grid-template-columns: minmax(260px, 330px) minmax(0, 1fr);
  gap: 1rem;
}

.panel {
  padding: 1.25rem;
}

.controls-panel,
.study-panel {
  display: grid;
  gap: 1rem;
}

.toggle-group,
.metric-grid,
.choice-grid,
.action-row {
  display: grid;
  gap: 0.75rem;
}

.toggle-group {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.metric-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.metric,
.list-panel {
  padding: 0.9rem;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel-strong) 84%, transparent 16%);
}

.metric strong,
.list-panel strong {
  display: block;
  font-size: 1.1rem;
}

.theme-button,
.mode-button,
.choice-button,
.ghost-button,
.primary-button {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 0.8rem 1rem;
  background: var(--panel-strong);
  color: var(--text);
  cursor: pointer;
  transition: transform 0.16s ease, border-color 0.16s ease, background 0.16s ease;
}

.theme-button,
.ghost-button,
.primary-button {
  border-radius: 999px;
}

.mode-button.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}

.choice-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.choice-button {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-align: left;
}

.choice-key,
.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2rem;
  padding: 0.4rem 0.7rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
}

.prompt-card,
.feedback-panel {
  padding: 1rem;
  border-radius: 24px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel-strong) 88%, transparent 12%);
}

.feedback-panel a,
.site-footer a {
  color: var(--accent);
}

.link-row,
.list-reset {
  display: grid;
  gap: 0.6rem;
  padding-left: 0;
  list-style: none;
  margin: 0;
}

.list-reset li,
.list-rows li {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  align-items: center;
}

.list-rows {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.7rem;
}

.action-row {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.site-footer {
  margin-top: 1rem;
  text-align: center;
  color: var(--muted);
}

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 55%, white 45%);
  outline-offset: 2px;
}

@media (max-width: 860px) {
  .site-header,
  .layout {
    grid-template-columns: 1fr;
  }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .site-shell {
    width: min(100%, calc(100% - 0.9rem));
  }

  .panel,
  .site-header,
  .prompt-card,
  .feedback-panel {
    border-radius: 20px;
    padding: 1rem;
  }

  .toggle-group,
  .metric-grid,
  .choice-grid,
  .action-row,
  .list-reset li,
  .list-rows li {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: flex-start;
  }
}