/* Variochess landing — single stylesheet, no build step, dark-blue palette.
   Tokens match privacy_policy.html / terms_of_service.html so all pages
   feel like one product. Mobile-first; desktop overrides at >=720px. */

:root {
  --bg:        #0D0D1A;
  --bg-2:      #14142B;
  --card:      #1A237E;
  --card-hi:   #283593;
  --accent:    #FFB74D;
  --accent-2:  #4FC3F7;
  --text:      #E8EAF6;
  --text-mute: #9FA8DA;
  --text-low:  #5C6BC0;
  --rule:      rgba(255,255,255,0.08);
  --shadow:    0 4px 24px rgba(0,0,0,0.4);
  --radius:    14px;
  --radius-sm: 8px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 {
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #FFFFFF;
}

h1 { font-size: clamp(2.2rem, 6vw, 3.6rem); line-height: 1.05; letter-spacing: -0.025em; }
h2 { font-size: clamp(1.6rem, 4vw, 2.2rem); line-height: 1.15; margin-bottom: 12px; }
h3 { font-size: 1.15rem; line-height: 1.3; }

p { color: var(--text); }

/* ─── Container ─────────────────────────────────────────────── */

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

section {
  padding: 64px 0;
  border-top: 1px solid var(--rule);
}

section:first-of-type { border-top: 0; }

.eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.lede {
  color: var(--text-mute);
  font-size: 1.05rem;
  max-width: 56ch;
  margin-bottom: 32px;
}

/* ─── Nav ───────────────────────────────────────────────────── */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(13, 13, 26, 0.85);
  border-bottom: 1px solid var(--rule);
}

.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.05rem;
  font-weight: 700;
  color: #FFFFFF;
  text-decoration: none;
  letter-spacing: -0.01em;
}

.brand:hover { text-decoration: none; }

.brand-mark { font-size: 1.4rem; color: var(--accent); }

.nav-links {
  display: none;
  gap: 18px;
  margin-left: auto;
  margin-right: 12px;
  align-items: center;
}

.nav-links a {
  color: var(--text-mute);
  font-size: 0.92rem;
  text-decoration: none;
}

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

.nav-cta {
  margin-left: auto;
}

@media (min-width: 720px) {
  .nav-links { display: flex; }
  .nav-cta { margin-left: 0; }
}

/* ─── Buttons ───────────────────────────────────────────────── */

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  text-align: center;
  transition: transform 0.15s, background 0.15s, color 0.15s;
  border: 0;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: #1A0F00;
}

.btn-primary:hover {
  background: #FFC78A;
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--text-low);
}

.btn-ghost:hover {
  border-color: var(--text);
  background: rgba(255,255,255,0.04);
  text-decoration: none;
}

.pill {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  background: rgba(255,183,77,0.15);
  color: var(--accent);
  border: 1px solid rgba(255,183,77,0.35);
}

/* ─── Hero ──────────────────────────────────────────────────── */

.hero {
  padding: 72px 0 56px;
  border-top: 0;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

@media (min-width: 720px) {
  .hero-inner { grid-template-columns: 1.3fr 1fr; gap: 56px; }
}

.hero h1 { margin-top: 12px; }

.hero-sub {
  font-size: 1.15rem;
  color: var(--text-mute);
  margin: 16px 0 28px;
  max-width: 50ch;
}

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

.hero-ribbon {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(79,195,247,0.10);
  border: 1px solid rgba(79,195,247,0.30);
  color: var(--accent-2);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-top: 28px;
}

.hero-art {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 260px;
}

.hero-art svg {
  width: 100%;
  max-width: 320px;
}

/* ─── 3-up Feature grid ────────────────────────────────────── */

.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 720px) {
  .feature-grid { grid-template-columns: repeat(3, 1fr); }
}

.feature {
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 24px;
}

.feature-icon {
  font-size: 1.6rem;
  margin-bottom: 8px;
  display: block;
}

.feature h3 { color: var(--text); margin-bottom: 6px; }

.feature p { color: var(--text-mute); font-size: 0.95rem; }

/* ─── Variant + Modifier cards ──────────────────────────────── */

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 540px) { .card-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 800px) { .card-grid { grid-template-columns: repeat(3, 1fr); } }

.card {
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
  transition: border-color 0.15s, transform 0.15s;
}

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

.card-emoji {
  font-size: 1.3rem;
  margin-bottom: 6px;
  display: block;
}

.card h3 { font-size: 1rem; color: var(--text); margin-bottom: 6px; }

.card p { color: var(--text-mute); font-size: 0.9rem; line-height: 1.4; }

.card details { margin-top: 10px; }

.card details summary {
  cursor: pointer;
  font-size: 0.82rem;
  color: var(--accent-2);
  list-style: none;
  user-select: none;
}

.card details summary::-webkit-details-marker { display: none; }

.card details summary::after {
  content: " ▾";
  font-size: 0.7em;
  vertical-align: middle;
}

.card details[open] summary::after { content: " ▴"; }

.card details p {
  margin-top: 8px;
  font-size: 0.86rem;
  color: var(--text-mute);
  line-height: 1.45;
}

/* ─── 5-up modifier row uses card-grid override ─────────────── */

@media (min-width: 800px) {
  .grid-5 { grid-template-columns: repeat(5, 1fr); }
}

/* ─── AI opponent portrait cards ─────────────────────────────── */

.ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

@media (min-width: 720px) {
  .ai-grid { grid-template-columns: repeat(4, 1fr); }
}

.ai-card {
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 20px 18px;
  text-align: center;
}

.ai-card-art {
  width: 64px;
  height: 64px;
  margin: 0 auto 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ai-card-art svg { width: 56px; height: 56px; }

.ai-card h3 { font-size: 1rem; margin-bottom: 2px; }

.ai-card .ai-tier {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.ai-card .ai-meta {
  color: var(--text-mute);
  font-size: 0.85rem;
  margin-top: 8px;
}

/* ─── Tutor section (2-col) ─────────────────────────────────── */

.tutor {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

@media (min-width: 720px) {
  .tutor { grid-template-columns: 1fr 1fr; }
}

.tutor-art {
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 28px;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-mute);
  font-size: 0.85rem;
  text-align: center;
}

ul.bullet { padding-left: 0; list-style: none; }
ul.bullet li {
  padding: 8px 0;
  border-bottom: 1px solid var(--rule);
  color: var(--text);
  font-size: 0.95rem;
}
ul.bullet li::before {
  content: "✓";
  color: var(--accent);
  font-weight: 700;
  margin-right: 10px;
}
ul.bullet li:last-child { border-bottom: 0; }

/* ─── Screenshots strip ─────────────────────────────────────── */

.shots {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 14px;
  -webkit-overflow-scrolling: touch;
}

.shots::-webkit-scrollbar { height: 6px; }
.shots::-webkit-scrollbar-thumb { background: var(--card); border-radius: 6px; }

.shot {
  flex: 0 0 240px;
  scroll-snap-align: start;
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
}

.shot svg { width: 100%; display: block; }

.shot-label {
  position: absolute;
  top: 8px;
  left: 8px;
  background: rgba(0,0,0,0.55);
  color: var(--text);
  font-size: 0.7rem;
  padding: 3px 8px;
  border-radius: 999px;
  letter-spacing: 0.04em;
}

.shot-caption {
  padding: 10px 12px;
  font-size: 0.85rem;
  color: var(--text-mute);
  border-top: 1px solid var(--rule);
  background: rgba(0,0,0,0.2);
}

/* ─── Get Started ───────────────────────────────────────────── */

.install-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 720px) {
  .install-grid { grid-template-columns: repeat(3, 1fr); }
}

.install-card {
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.install-card h3 { font-size: 1.05rem; }

.install-card p {
  color: var(--text-mute);
  font-size: 0.9rem;
  flex: 1;
}

.install-card .btn { align-self: flex-start; }

/* ─── FAQ ───────────────────────────────────────────────────── */

.faq details {
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  margin-bottom: 10px;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--text);
  list-style: none;
  user-select: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq summary::-webkit-details-marker { display: none; }

.faq summary::after {
  content: "+";
  color: var(--accent);
  font-size: 1.3rem;
  font-weight: 400;
  margin-left: 16px;
}

.faq details[open] summary::after { content: "−"; }

.faq details p {
  color: var(--text-mute);
  margin-top: 12px;
  font-size: 0.95rem;
  line-height: 1.5;
}

/* ─── Footer ────────────────────────────────────────────────── */

footer {
  padding: 48px 0 36px;
  border-top: 1px solid var(--rule);
  background: var(--bg);
}

.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
  color: var(--text-mute);
  font-size: 0.88rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer-links a {
  color: var(--text-mute);
  text-decoration: none;
}

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

/* ─── Reduced motion ────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .card, .btn-primary { transition: none; }
}