:root {
  --bg-deep: #0a0a14;
  --bg-mid: #15102a;
  --bg-high: #1f1a3a;
  --text: #e8eef9;
  --text-muted: #9aa6c0;
  --text-faint: #6e7894;
  --accent: #5ee0dc;
  --accent-glow: rgba(94, 224, 220, 0.22);
  --p1: #b69ce0;
  --p2: #87ceeb;
  --border: rgba(110, 130, 165, 0.25);
  --border-strong: rgba(94, 224, 220, 0.5);
  --max-width: 1200px;
  --radius: 14px;
  --radius-sm: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background:
    radial-gradient(
      ellipse at 50% -10%,
      var(--bg-high) 0%,
      var(--bg-mid) 35%,
      var(--bg-deep) 75%
    ),
    var(--bg-deep);
  background-attachment: fixed;
  color: var(--text);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter",
    system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 120ms;
}

a:hover,
a:focus-visible {
  color: var(--text);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

@media (hover: none) and (pointer: coarse) {
  :focus-visible {
    outline: none;
  }
}

h1,
h2,
h3 {
  margin: 0;
  letter-spacing: 0.2px;
}

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

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px clamp(20px, 5vw, 48px);
  background: rgba(10, 10, 20, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.brand {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.brand-p1 {
  color: var(--p1);
}

.brand-p2 {
  color: var(--p2);
}

.site-nav {
  display: flex;
  gap: 28px;
}

.site-nav a {
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.3px;
}

@media (max-width: 640px) {
  .site-nav {
    gap: 18px;
  }
  .site-nav a {
    font-size: 13px;
  }
}

/* ---------- Sections ---------- */

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 48px);
}

section {
  padding: clamp(60px, 9vw, 120px) 0;
}

section h2 {
  font-size: clamp(28px, 4vw, 40px);
  margin-bottom: 12px;
}

.section-sub {
  color: var(--text-muted);
  font-size: 17px;
  max-width: 640px;
  margin: 0 0 36px;
}

/* ---------- Hero ---------- */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
  padding-top: clamp(40px, 6vw, 80px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

@media (max-width: 880px) {
  .hero {
    grid-template-columns: 1fr;
  }
}

.hero-title {
  font-size: clamp(34px, 5.5vw, 60px);
  line-height: 1.05;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.hero-emphasis {
  background: linear-gradient(110deg, var(--p1), var(--p2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  color: var(--text-muted);
  font-size: 18px;
  line-height: 1.6;
  max-width: 540px;
  margin: 22px 0 28px;
}

.hero-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin: 0;
}

.cta-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  background: var(--accent-glow);
  color: var(--text);
  border: 1px solid var(--border-strong);
  font-weight: 600;
  letter-spacing: 0.4px;
  font-size: 15px;
  box-shadow: 0 1px 12px var(--accent-glow);
  transition: transform 120ms, background 120ms, box-shadow 120ms;
}

.cta-primary:hover,
.cta-primary:focus-visible {
  color: var(--text);
  transform: translateY(-1px);
  background: rgba(94, 224, 220, 0.34);
  box-shadow: 0 4px 24px rgba(94, 224, 220, 0.32);
}

.cta-icon {
  font-size: 11px;
  opacity: 0.9;
}

.cta-secondary {
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  padding: 14px 14px;
  letter-spacing: 0.3px;
}

.hero-meta {
  margin: 22px 0 0;
  color: var(--text-faint);
  font-size: 13px;
  letter-spacing: 0.3px;
}

.hero-image img {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.55),
    0 0 0 1px rgba(0, 0, 0, 0.3);
}

/* ---------- Modes ---------- */

.card-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 36px;
}

@media (max-width: 880px) {
  .card-row {
    grid-template-columns: 1fr;
  }
}

.card {
  background: rgba(20, 25, 38, 0.55);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition: border-color 160ms, transform 160ms;
}

.card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.card h3 {
  font-size: 22px;
  margin-bottom: 6px;
  background: linear-gradient(110deg, var(--p1), var(--p2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.card-sub {
  color: var(--accent);
  font-size: 13px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin: 0 0 14px;
  font-weight: 600;
}

.card p {
  color: var(--text-muted);
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
}

/* ---------- Themes ---------- */

.theme-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

@media (max-width: 880px) {
  .theme-row {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 560px) {
  .theme-row {
    grid-template-columns: 1fr;
  }
}

.theme {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.theme img {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  aspect-ratio: 1 / 1;
  object-fit: cover;
  transition: border-color 160ms;
}

.theme:hover img {
  border-color: var(--border-strong);
}

.theme figcaption {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.5;
}

.theme figcaption strong {
  color: var(--text);
}

/* ---------- How to play ---------- */

.how-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px 48px;
  margin-top: 36px;
}

@media (max-width: 720px) {
  .how-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

.how-grid h3 {
  font-size: 18px;
  color: var(--accent);
  margin-bottom: 10px;
  letter-spacing: 0.4px;
}

.how-grid p {
  color: var(--text-muted);
  margin: 0;
  line-height: 1.65;
}

.how-grid > div:last-child {
  grid-column: 1 / -1;
}

.controls-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 36px;
  color: var(--text-muted);
}

@media (max-width: 720px) {
  .controls-list {
    grid-template-columns: 1fr;
  }
}

.controls-list strong {
  color: var(--text);
  font-weight: 600;
}

.how-cta {
  text-align: center;
  margin-top: 48px;
}

/* ---------- Footer ---------- */

.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px clamp(20px, 5vw, 48px);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  border-top: 1px solid var(--border);
  color: var(--text-faint);
  font-size: 13px;
}

.brand-small {
  font-weight: 700;
  letter-spacing: 0.4px;
}

.footer-tagline {
  margin: 0;
}

.footer-legal {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-legal a {
  color: var(--text-muted);
}

.footer-legal a:hover,
.footer-legal a:focus-visible {
  color: var(--accent);
}