:root {
  color-scheme: dark;
  --bg: #07101a;
  --bg-elevated: #0d1825;
  --panel: rgba(11, 24, 38, 0.92);
  --panel-soft: rgba(18, 33, 51, 0.84);
  --line: rgba(148, 174, 205, 0.18);
  --line-strong: rgba(148, 174, 205, 0.32);
  --ink: #eef5ff;
  --muted: #9eb2ca;
  --brand: #76b7ff;
  --brand-strong: #b0d4ff;
  --good: #68e2aa;
  --warn: #ffca73;
  --danger: #ff8e86;
  --shadow: 0 22px 70px rgba(0, 0, 0, 0.38);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top, rgba(47, 87, 146, 0.28), transparent 28%),
    linear-gradient(180deg, #07101a 0%, #091523 100%);
  color: var(--ink);
  line-height: 1.55;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 56px;
}

.site-header,
.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
}

.site-header { margin-bottom: 24px; }
.site-footer {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.brand {
  display: inline-block;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: 0.03em;
}

.tagline,
.footer-meta,
.disclaimer,
.hero-copy,
.context-note,
.feedback-card p,
.summary-item p,
.copy-panel p,
.content-panel p,
.content-panel li {
  color: var(--muted);
}

.tagline {
  margin: 6px 0 0;
  font-size: 0.95rem;
}

.site-nav,
.footer-links,
.action-row,
.summary-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.nav-link,
.ghost-button,
.primary-button,
.choice-card,
.card,
.legend-card,
.call-card,
.feedback-card,
.summary-item,
.notice-panel,
.content-panel,
.copy-panel {
  border-radius: 22px;
}

.nav-link {
  padding: 10px 14px;
  color: var(--muted);
  border: 1px solid transparent;
}

.nav-link.is-active,
.nav-link:hover {
  color: var(--ink);
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.03);
  text-decoration: none;
}

.page {
  display: grid;
  gap: 20px;
}

.card,
.notice-panel,
.content-panel,
.copy-panel,
.game-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 24px;
}

.hero-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(260px, 0.85fr);
  gap: 20px;
}

.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brand);
  font-weight: 700;
  margin-bottom: 12px;
}

h1, h2, h3 {
  line-height: 1.1;
  margin: 0 0 14px;
}

h1 { font-size: clamp(2.1rem, 6vw, 4rem); }
h2 { font-size: clamp(1.3rem, 3vw, 1.9rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.5rem); }

.hero-copy {
  max-width: 56ch;
  font-size: 1.06rem;
}

.hero-list,
.bullet-list,
.number-list {
  margin: 18px 0 0;
  padding-left: 20px;
}

.hero-list li,
.bullet-list li,
.number-list li {
  margin-bottom: 10px;
}

.hero-stats,
.summary-metrics,
.legend-grid {
  display: grid;
  gap: 14px;
}

.hero-stats,
.summary-metrics {
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  align-content: start;
}

.legend-grid {
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  margin: 20px 0;
}

.stat-card,
.legend-card,
.summary-item {
  background: var(--panel-soft);
  border: 1px solid var(--line);
  padding: 16px;
}

.stat-card span,
.legend-card span,
.mini-label,
.summary-item span {
  display: block;
  color: var(--muted);
  font-size: 0.83rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.stat-card strong,
.legend-card strong,
.summary-item strong {
  display: block;
  margin-top: 8px;
  font-size: 1.05rem;
}

.notice-panel h2,
.panel-head h2,
.section-heading h2,
.content-panel h1 {
  margin-bottom: 10px;
}

.panel-head,
.progress-row,
.call-topline {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.progress-row {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
  padding: 14px 16px;
  border-radius: 18px;
  margin-bottom: 18px;
}

.progress-row strong {
  display: block;
  margin-top: 4px;
  font-size: 1.1rem;
}

.channel-tag,
.window-tag,
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.channel-tag,
.status-pill {
  color: var(--brand-strong);
  background: rgba(118, 183, 255, 0.12);
  border: 1px solid rgba(118, 183, 255, 0.25);
}

.window-tag {
  color: var(--warn);
  background: rgba(255, 202, 115, 0.11);
  border: 1px solid rgba(255, 202, 115, 0.22);
}

.game-app {
  display: grid;
  gap: 18px;
}

.stack-block { display: none; }
.stack-block.active,
.stack-block:not([hidden]) { display: block; }

.call-card {
  background: linear-gradient(180deg, rgba(118, 183, 255, 0.06), rgba(255,255,255,0.02));
  border: 1px solid var(--line-strong);
  padding: 20px;
}

.transcript {
  font-size: 1.16rem;
  font-weight: 600;
  color: var(--ink);
}

.context-note {
  margin: 16px 0 0;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 16px;
  border: 1px solid var(--line);
}

.decision-form {
  display: grid;
  gap: 18px;
}

fieldset {
  margin: 0;
  padding: 0;
  border: 0;
}

legend {
  margin-bottom: 12px;
  font-weight: 700;
}

.choice-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 12px;
}

.choice-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.choice-card:hover {
  transform: translateY(-1px);
  border-color: rgba(118, 183, 255, 0.38);
}

.choice-card.is-selected {
  border-color: rgba(118, 183, 255, 0.6);
  background: rgba(118, 183, 255, 0.12);
}

.choice-card input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.choice-card strong {
  font-size: 1rem;
}

.choice-card span {
  color: var(--muted);
  font-size: 0.93rem;
}

.primary-button,
.ghost-button {
  appearance: none;
  border: 0;
  cursor: pointer;
  font: inherit;
  padding: 14px 18px;
  transition: transform 0.15s ease, filter 0.15s ease, background 0.15s ease;
}

.primary-button {
  color: #04111d;
  font-weight: 800;
  background: linear-gradient(135deg, #d6ecff, #76b7ff);
  box-shadow: 0 14px 30px rgba(118, 183, 255, 0.22);
}

.ghost-button {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
}

.compact-button { padding-inline: 14px; }

.primary-button:hover,
.ghost-button:hover {
  transform: translateY(-1px);
  filter: brightness(1.03);
  text-decoration: none;
}

.primary-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.feedback-box { min-height: 64px; }

.feedback-card {
  padding: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.feedback-card.success {
  border-color: rgba(104, 226, 170, 0.35);
  background: rgba(104, 226, 170, 0.08);
}

.feedback-card.warning {
  border-color: rgba(255, 202, 115, 0.3);
  background: rgba(255, 202, 115, 0.08);
}

.feedback-title {
  margin: 0 0 8px;
  font-weight: 800;
  color: var(--ink);
}

.summary-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.section-heading { margin-bottom: 14px; }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  background: rgba(255,255,255,0.06);
  padding: 2px 6px;
  border-radius: 8px;
}

@media (max-width: 900px) {
  .hero-panel { grid-template-columns: 1fr; }
  .site-header,
  .site-footer,
  .panel-head,
  .progress-row,
  .call-topline { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 640px) {
  .site-shell { width: min(100% - 20px, 1120px); padding-top: 16px; }
  .card,
  .notice-panel,
  .content-panel,
  .copy-panel,
  .game-panel { padding: 18px; }
  .choice-grid,
  .hero-stats,
  .summary-metrics,
  .legend-grid { grid-template-columns: 1fr; }
  h1 { font-size: 2.05rem; }
}