:root {
  --bg: #f6f5f3;
  --bg-panel: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --cyan: #0891b2;
  --cyan-bright: #06b6d4;
  --cyan-soft: #ecfeff;
  --shadow: 0 18px 50px rgba(15, 23, 42, 0.08);
  --radius: 1.25rem;
  --max: 72rem;
  --font: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a {
  color: var(--cyan);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: #0e7490;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
  background: rgba(246, 245, 243, 0.88);
  border-bottom: 1px solid var(--border);
}

.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-left: auto;
}

.header-play {
  flex-shrink: 0;
  padding: 0.7rem 1rem;
  font-size: 0.92rem;
  white-space: nowrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.brand img {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 0.85rem;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
}

.nav a:hover {
  color: var(--text);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.25rem;
  border-radius: 999px;
  font-weight: 800;
  text-decoration: none;
  border: 0;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, #06b6d4, #0891b2);
  color: #fff;
  box-shadow: 0 10px 30px rgba(6, 182, 212, 0.28);
}

.btn-primary:hover {
  color: #fff;
  filter: brightness(1.03);
}

.btn-secondary {
  background: var(--bg-panel);
  color: var(--text);
  border: 1px solid var(--border);
}

.hero {
  padding: 4.5rem 0 3rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: var(--cyan-soft);
  color: #0e7490;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 1rem 0 0.75rem;
  font-size: clamp(2.4rem, 5vw, 4rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
}

.lead {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 38rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.75rem;
}

.hero-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 0.25rem);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.hero-card h2 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
}

.hero-card ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.section {
  padding: 3.5rem 0;
}

.section h2 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  letter-spacing: -0.03em;
}

.section p.section-lead {
  margin: 0 0 2rem;
  color: var(--muted);
  max-width: 42rem;
}

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

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

.card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.card h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.game-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
  gap: 1rem;
}

.game-card {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  min-height: 100%;
}

.game-card .emoji {
  font-size: 1.75rem;
}

.game-card .meta {
  color: var(--muted);
  font-size: 0.85rem;
}

.game-card .play-link {
  margin-top: auto;
  font-weight: 700;
  text-decoration: none;
}

.how-to-list,
.sample-list {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--text);
}

.how-to-list li + li,
.sample-list li + li {
  margin-top: 0.65rem;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
  gap: 0.85rem;
}

.topic-chip h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
}

.topic-chip-hot {
  border-color: #fbbf24;
  background: linear-gradient(180deg, #fffbeb, #ffffff);
}

.hot-badge {
  display: inline-block;
  margin-left: 0.35rem;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  background: #fef3c7;
  color: #b45309;
  font-size: 0.72rem;
  font-weight: 800;
  vertical-align: middle;
}

.game-card h2 {
  margin: 0;
  font-size: 1.15rem;
}

.game-card h2 a {
  color: inherit;
  text-decoration: none;
}

.game-card h2 a:hover {
  color: var(--cyan);
}

.faq details {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}

.faq details + details {
  margin-top: 0.75rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
}

.faq p {
  margin: 0.75rem 0 0;
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0 3rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer .inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.social-links {
  margin: 0.35rem 0 0;
}

.social-links a {
  font-weight: 600;
  text-decoration: none;
}

.social-links a:hover {
  text-decoration: underline;
}

@media (max-width: 900px) {
  .hero-grid,
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .nav {
    display: none;
  }

  .brand span {
    font-size: 0.95rem;
  }
}