:root {
  --bg: #070b12;
  --bg-elevated: #0e1520;
  --surface: #131c2b;
  --surface-hover: #1a2638;
  --border: #243044;
  --border-active: #3b82f6;
  --text: #eef2f8;
  --muted: #8fa3bf;
  --accent: #3b82f6;
  --accent-soft: rgba(59, 130, 246, 0.12);
  --accent-glow: rgba(59, 130, 246, 0.35);
  --gradient: radial-gradient(ellipse 80% 60% at 50% -20%, rgba(59, 130, 246, 0.18), transparent);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  background-image: var(--gradient);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 1280px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 0 1.5rem;
}

.site-header {
  padding: 2.5rem 0 2rem;
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, #3b82f6, #1d4ed8);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: -0.02em;
  box-shadow: 0 8px 24px var(--accent-glow);
}

.brand-eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.brand-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.site-subtitle {
  color: var(--muted);
  font-size: 0.9375rem;
  max-width: 42rem;
  margin-bottom: 1rem;
}

.reset-banner {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  padding: 0.625rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--accent-soft);
  font-size: 0.8125rem;
}

.reset-label {
  color: var(--muted);
}

.reset-timer {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--text);
  letter-spacing: 0.04em;
  min-width: 5.5rem;
}

.reset-sublabel {
  color: var(--muted);
  font-size: 0.75rem;
}

@media (max-width: 640px) {
  .reset-banner {
    width: 100%;
  }
}

.layout {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(280px, 2fr) minmax(320px, 3fr);
  gap: 2rem;
  padding: 2rem 0 3rem;
}

.detail-panel {
  position: sticky;
  top: 1.5rem;
  align-self: start;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.75rem;
  min-height: 420px;
}

.detail-placeholder {
  color: var(--muted);
  font-size: 0.9375rem;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 360px;
  text-align: center;
  padding: 1rem;
}

.hidden { display: none !important; }

.detail-badge {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #93c5fd;
  background: var(--accent-soft);
  padding: 0.25rem 0.625rem;
  border-radius: 999px;
  margin-bottom: 0.75rem;
}

.detail-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.detail-description {
  color: var(--muted);
  font-size: 0.9375rem;
  margin-bottom: 1.5rem;
}

.detail-section {
  margin-bottom: 1.5rem;
}

.detail-section h3 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.capability-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.capability-list li {
  font-size: 0.875rem;
  padding-left: 1.25rem;
  position: relative;
  color: var(--text);
}

.capability-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chip {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.3rem 0.65rem;
  border-radius: 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: #c5d4e8;
}

.detail-actions {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: 10px;
  padding: 0.75rem 1.25rem;
  transition: background 0.15s, box-shadow 0.15s, transform 0.1s;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  width: 100%;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-primary:hover {
  background: #2563eb;
  transform: translateY(-1px);
}

.detail-note {
  margin-top: 0.75rem;
  font-size: 0.75rem;
  color: var(--muted);
  text-align: center;
}

.cards-panel {
  min-width: 0;
}

.cards-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.cards-header h2 {
  font-size: 1.125rem;
  font-weight: 600;
}

.demo-count {
  font-size: 0.8125rem;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
}

.card-grid {
  display: grid;
  gap: 1rem;
}

.demo-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.25rem 1.35rem;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
  text-align: left;
  width: 100%;
  color: inherit;
  font: inherit;
}

.demo-card:hover {
  background: var(--surface-hover);
  border-color: #34506e;
}

.demo-card.selected {
  border-color: var(--border-active);
  box-shadow: 0 0 0 1px var(--border-active), 0 8px 24px rgba(0, 0, 0, 0.25);
}

.demo-card h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.demo-card p {
  font-size: 0.875rem;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.card-tag {
  font-size: 0.6875rem;
  font-weight: 500;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  background: var(--accent-soft);
  color: #93c5fd;
}

.site-footer {
  padding: 1.5rem 0 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.8125rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.footer-dot { opacity: 0.5; }

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .detail-panel {
    position: static;
    order: -1;
    min-height: auto;
  }

  .detail-placeholder {
    min-height: 120px;
  }
}