/* ============================================================
   Sudoku Masters: World Champion — Landing Page Styles
   Design System: "Chess.com meets Apple Arcade"
   Theme: Cosmic Gold with Glass Morphism
   ============================================================ */

:root {
  /* Gold Palette */
  --gold: #F4B740;
  --gold-deep: #D89B2E;
  --gold-glow: #FFE4A3;
  --gold-muted: #FFF5DC;
  --gold-shimmer: #FFD700;

  /* Light Mode */
  --canvas: #FAF8F5;
  --surface: #FFFFFF;
  --surface-elevated: #FFFDF8;
  --recessed: #F5F2ED;
  --text-primary: #1A1814;
  --text-secondary: #5C564D;
  --text-tertiary: #9C958A;

  /* Dark Mode */
  --dark-canvas: #0F0E0C;
  --dark-surface: #1A1815;
  --dark-elevated: #242118;
  --dark-text: #F5F2ED;
  --dark-text-secondary: #A39E94;

  /* Signals */
  --success: #28A745;
  --info: #3498DB;
  --error: #DC3545;

  /* Tier Colors */
  --bronze: #CD7F32;
  --silver: #C0C0C0;
  --champion: #9B59B6;
  --legend: #00D9FF;

  /* Spacing */
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-card: 20px;
  --radius-lg: 24px;
  --radius-xl: 28px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--dark-text);
  background: var(--dark-canvas);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Typography ─────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-weight: 600;
  letter-spacing: -0.4px;
  line-height: 1.2;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); letter-spacing: -0.8px; }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: 1.25rem; }
p { color: var(--dark-text-secondary); }

a { color: var(--gold); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--gold-glow); }

/* ── Layout ─────────────────────────────────────────────── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 80px 0;
}

/* ── Glass Card ─────────────────────────────────────────── */
.glass {
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(244, 183, 64, 0.1);
  border-radius: var(--radius-card);
}

.glass-gold {
  background: rgba(244, 183, 64, 0.06);
  border: 1px solid rgba(244, 183, 64, 0.15);
}

/* ── Navigation ─────────────────────────────────────────── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  background: rgba(15, 14, 12, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(244, 183, 64, 0.08);
}

nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--dark-text);
}

.nav-brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--dark-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

.nav-cta {
  padding: 8px 20px;
  background: var(--gold);
  color: var(--dark-canvas) !important;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  transition: background 0.2s;
}

.nav-cta:hover { background: var(--gold-deep); color: var(--dark-canvas) !important; }

/* ── Hero ───────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(244, 183, 64, 0.08) 0%, transparent 60%),
    linear-gradient(180deg, #141210, #0F0E0C, #0A0908);
  overflow: hidden;
  position: relative;
}

.hero::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(244, 183, 64, 0.04) 0%, transparent 70%);
  pointer-events: none;
}

.hero .container {
  display: flex;
  align-items: center;
  gap: 64px;
  position: relative;
  z-index: 1;
}

.hero-content {
  flex: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(244, 183, 64, 0.1);
  border: 1px solid rgba(244, 183, 64, 0.2);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--gold);
  margin-bottom: 24px;
}

.hero h1 {
  color: var(--dark-text);
  margin-bottom: 8px;
}

.hero h1 .gold { color: var(--gold); }

.hero .tagline {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--dark-text-secondary);
  margin-bottom: 24px;
  max-width: 500px;
}

.hero .description {
  font-size: 1rem;
  color: var(--dark-text-secondary);
  margin-bottom: 32px;
  max-width: 480px;
  line-height: 1.7;
}

.hero-visual {
  flex: 0 0 auto;
  position: relative;
}

.app-icon-hero {
  width: 280px;
  height: 280px;
  border-radius: 56px;
  box-shadow:
    0 0 80px rgba(244, 183, 64, 0.15),
    0 20px 60px rgba(0, 0, 0, 0.4);
  transition: transform 0.3s ease;
}

.app-icon-hero:hover {
  transform: scale(1.03);
}

/* ── Store Buttons ──────────────────────────────────────── */
.store-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.store-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
  text-decoration: none;
}

.store-btn-primary {
  background: var(--gold);
  color: var(--dark-canvas);
}

.store-btn-primary:hover {
  background: var(--gold-deep);
  color: var(--dark-canvas);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(244, 183, 64, 0.3);
}

.store-btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--dark-text);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.store-btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--dark-text);
  transform: translateY(-2px);
}

.store-btn svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

/* ── Features ───────────────────────────────────────────── */
.features {
  background: var(--dark-canvas);
  position: relative;
}

.features::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(244, 183, 64, 0.2), transparent);
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-header h2 {
  color: var(--dark-text);
  margin-bottom: 12px;
}

.section-header p {
  max-width: 560px;
  margin: 0 auto;
  font-size: 1.05rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.feature-card {
  padding: 32px;
  transition: all 0.3s;
}

.feature-card:hover {
  border-color: rgba(244, 183, 64, 0.25);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: rgba(244, 183, 64, 0.1);
  color: var(--gold);
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.feature-card h3 {
  color: var(--dark-text);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.95rem;
  line-height: 1.65;
}

/* ── Stats Banner ───────────────────────────────────────── */
.stats-banner {
  background:
    linear-gradient(135deg, rgba(244, 183, 64, 0.06), rgba(244, 183, 64, 0.02));
  border-top: 1px solid rgba(244, 183, 64, 0.1);
  border-bottom: 1px solid rgba(244, 183, 64, 0.1);
  padding: 48px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.stat-item h3 {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  color: var(--gold);
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
}

.stat-item p {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 4px;
}

/* ── Game Modes ─────────────────────────────────────────── */
.modes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.mode-card {
  padding: 36px 28px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.mode-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gold-glow), var(--gold), var(--gold-deep));
  opacity: 0;
  transition: opacity 0.3s;
}

.mode-card:hover::before { opacity: 1; }

.mode-emoji {
  font-size: 2.5rem;
  margin-bottom: 16px;
  display: block;
}

.mode-card h3 {
  color: var(--dark-text);
  margin-bottom: 8px;
}

.mode-card p {
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ── Difficulty ─────────────────────────────────────────── */
.difficulty-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 40px;
}

.difficulty-item {
  text-align: center;
  padding: 24px 16px;
}

.difficulty-item .level {
  font-weight: 600;
  color: var(--dark-text);
  margin-bottom: 4px;
}

.difficulty-item .cells {
  font-size: 0.85rem;
  color: var(--dark-text-secondary);
}

.difficulty-bar {
  height: 4px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.06);
  margin-top: 12px;
  overflow: hidden;
}

.difficulty-bar span {
  display: block;
  height: 100%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--gold-glow), var(--gold));
}

/* ── Blog / SEO Content ─────────────────────────────────── */
.blog {
  background: var(--dark-canvas);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.blog-card {
  overflow: hidden;
  transition: all 0.3s;
  display: flex;
  flex-direction: column;
}

.blog-card:hover {
  border-color: rgba(244, 183, 64, 0.25);
  transform: translateY(-4px);
}

.blog-card-header {
  padding: 32px 28px 0;
  font-size: 2.5rem;
  text-align: center;
}

.blog-card-body {
  padding: 24px 28px 28px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.blog-tag {
  display: inline-block;
  padding: 4px 10px;
  background: rgba(244, 183, 64, 0.1);
  color: var(--gold);
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.blog-card h3 {
  color: var(--dark-text);
  margin-bottom: 8px;
  font-size: 1.15rem;
}

.blog-card p {
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

.blog-link {
  margin-top: auto;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--gold);
}

.blog-link:hover { color: var(--gold-glow); }

/* ── CTA Section ────────────────────────────────────────── */
.cta {
  text-align: center;
  padding: 100px 0;
  background:
    radial-gradient(ellipse at 50% 100%, rgba(244, 183, 64, 0.08), transparent 60%),
    var(--dark-canvas);
}

.cta h2 {
  color: var(--dark-text);
  margin-bottom: 12px;
}

.cta p {
  max-width: 480px;
  margin: 0 auto 32px;
  font-size: 1.05rem;
}

.cta .store-buttons {
  justify-content: center;
}

/* ── Footer ─────────────────────────────────────────────── */
footer {
  padding: 48px 0 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer-brand img {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 0.9rem;
  max-width: 300px;
  line-height: 1.6;
}

.footer-col h4 {
  color: var(--dark-text);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: var(--dark-text-secondary);
  font-size: 0.9rem;
}

.footer-col a:hover { color: var(--gold); }

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

/* ── Blog Page Styles ───────────────────────────────────── */
.blog-page {
  padding-top: 120px;
  padding-bottom: 80px;
  min-height: 100vh;
}

.blog-page article {
  max-width: 720px;
  margin: 0 auto;
}

.blog-page article h1 {
  color: var(--dark-text);
  margin-bottom: 16px;
}

.blog-page .blog-meta {
  display: flex;
  gap: 16px;
  margin-bottom: 40px;
  font-size: 0.9rem;
  color: var(--dark-text-secondary);
}

.blog-page article h2 {
  color: var(--dark-text);
  margin-top: 40px;
  margin-bottom: 16px;
  font-size: 1.5rem;
}

.blog-page article h3 {
  color: var(--dark-text);
  margin-top: 32px;
  margin-bottom: 12px;
}

.blog-page article p {
  margin-bottom: 20px;
  font-size: 1.05rem;
  line-height: 1.8;
}

.blog-page article ul, .blog-page article ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.blog-page article li {
  margin-bottom: 8px;
  color: var(--dark-text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
}

.blog-page article strong {
  color: var(--dark-text);
}

.blog-page .blog-cta {
  margin-top: 48px;
  padding: 32px;
  text-align: center;
}

.blog-page .blog-cta h3 {
  color: var(--dark-text);
  margin-bottom: 12px;
}

.blog-page .blog-cta p {
  max-width: 400px;
  margin: 0 auto 20px;
  font-size: 0.95rem;
}

/* ── Legal Page Styles ─────────────────────────────────── */
.legal-page article ul {
  margin-bottom: 20px;
  padding-left: 24px;
}

.legal-page article ul ul {
  margin-top: 8px;
  margin-bottom: 0;
}

.legal-page article li {
  margin-bottom: 8px;
  color: var(--dark-text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
}

.legal-copyright {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.9rem;
  color: var(--dark-text-secondary);
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 768px) {
  .hero .container {
    flex-direction: column-reverse;
    text-align: center;
    gap: 40px;
  }

  .hero .tagline,
  .hero .description { margin-left: auto; margin-right: auto; }

  .store-buttons { justify-content: center; }

  .app-icon-hero { width: 180px; height: 180px; border-radius: 36px; }

  .nav-links { display: none; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); }

  .modes-grid { grid-template-columns: 1fr; }

  .difficulty-grid { grid-template-columns: repeat(2, 1fr); }

  .footer-grid { grid-template-columns: 1fr; gap: 32px; }

  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }

  .features-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  section { padding: 56px 0; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .store-btn { padding: 12px 20px; font-size: 0.85rem; }
}