:root { 
  --bg: #091A14; 
  --fg: #E6F2EE; 
  --muted: #B8D0C7; 
  --brand: #16a34a; 
  --card: #0F241C; 
  --border: #123326;
  --hover: #1e3a2f;
}

* { 
  box-sizing: border-box; 
}

html, body { 
  margin: 0; 
  padding: 0; 
  font-family: system-ui, 'Segoe UI', Roboto, Arial, sans-serif; 
  color: var(--fg); 
  background: var(--bg); 
  line-height: 1.6;
}

.container { 
  max-width: 1100px; 
  margin: 0 auto; 
  padding: 0 16px; 
}

.site-header, .site-footer { 
  background: #0b1f18; 
  border-bottom: 1px solid var(--border); 
}

.site-header .container, .site-footer .container { 
  display: flex; 
  align-items: center; 
  justify-content: space-between; 
  gap: 16px; 
  padding: 14px 16px; 
}

.logo { 
  color: #fff; 
  text-decoration: none; 
  font-weight: 700; 
  font-size: 1.2rem;
}

.logo:hover {
  color: var(--brand);
}

.nav {
  display: flex;
  gap: 4px;
}

.nav a { 
  color: var(--muted); 
  margin-left: 14px; 
  text-decoration: none; 
  padding: 8px 12px;
  border-radius: 8px;
  transition: all 0.2s ease;
}

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

.hero { 
  padding: 72px 0 40px; 
  background: radial-gradient(60% 100% at 50% 0%, var(--border) 0%, transparent 60%); 
  text-align: center; 
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin: 0 0 16px 0;
  font-weight: 800;
  background: linear-gradient(135deg, #fff 0%, var(--brand) 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-fill-color: transparent;
}

.hero .sub { 
  color: var(--muted); 
  margin: 12px auto 24px; 
  max-width: 720px; 
  font-size: 1.1rem;
}

.cta {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn { 
  display: inline-block; 
  padding: 12px 20px; 
  border-radius: 10px; 
  background: var(--brand); 
  color: #04120C; 
  text-decoration: none; 
  font-weight: 700; 
  border: 0; 
  cursor: pointer; 
  transition: all 0.2s ease;
  font-size: 1rem;
}

.btn:hover {
  background: #22c55e;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(22, 163, 74, 0.3);
}

.btn.ghost { 
  background: transparent; 
  color: var(--fg); 
  border: 2px solid var(--hover); 
}

.btn.ghost:hover {
  background: var(--hover);
  border-color: var(--brand);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(30, 58, 47, 0.4);
}

.play { 
  padding: 60px 0; 
}

.play h2 {
  text-align: center;
  margin-bottom: 12px;
  font-size: 2.5rem;
  font-weight: 700;
}

.note { 
  color: var(--muted); 
  font-size: 14px; 
  text-align: center;
  margin-bottom: 20px;
}

.note a {
  color: var(--brand);
  text-decoration: none;
}

.note a:hover {
  text-decoration: underline;
}

.iframe-wrap { 
  position: relative; 
  width: 100%; 
  aspect-ratio: 4/3; 
  background: #000; 
  border-radius: 12px; 
  overflow: hidden; 
  box-shadow: 0 10px 30px rgba(0,0,0,.4);
  margin-bottom: 20px;
}

.iframe-wrap iframe { 
  position: absolute; 
  top: 0;
  left: 0;
  width: 100%; 
  height: 100%; 
  border: 0; 
}

#toggle-fullscreen {
  display: block;
  margin: 0 auto;
}

.guide, .features, .faq { 
  padding: 60px 0; 
}

.guide h2, .features h2, .faq h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 24px;
  text-align: center;
}

.guide p {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 800px;
  margin: 0 auto 20px;
  text-align: center;
}

.tips { 
  line-height: 1.8;
  max-width: 800px;
  margin: 32px auto;
  list-style: none;
  padding: 0;
}

.tips li {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 12px;
  transition: border-color 0.2s ease;
}

.tips li:hover {
  border-color: var(--brand);
}

.tips strong {
  color: var(--brand);
}

.cards { 
  display: grid; 
  grid-template-columns: repeat(4, 1fr); 
  gap: 20px; 
  margin-top: 40px;
}

.card { 
  background: var(--card); 
  border: 1px solid var(--border); 
  padding: 24px; 
  border-radius: 12px; 
  transition: all 0.2s ease;
}

.card:hover {
  border-color: var(--brand);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}

.card h3 {
  color: var(--brand);
  margin-bottom: 12px;
  font-size: 1.2rem;
  font-weight: 600;
}

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

.faq {
  max-width: 800px;
  margin: 0 auto;
}

details { 
  background: var(--card); 
  border: 1px solid var(--border); 
  border-radius: 12px; 
  padding: 0; 
  margin-bottom: 16px; 
  overflow: hidden;
  transition: border-color 0.2s ease;
}

details:hover {
  border-color: var(--brand);
}

summary { 
  cursor: pointer; 
  font-weight: 600; 
  padding: 16px 20px;
  background: var(--card);
  transition: background 0.2s ease;
  border-bottom: 1px solid transparent;
}

summary:hover {
  background: var(--hover);
}

details[open] summary {
  border-bottom-color: var(--border);
}

details div {
  padding: 16px 20px;
}

details div p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.site-footer {
  background: #0c0f0c;
  color: #bbb;
  border-top: 1px solid #1b1f1b;
  font-size: 0.9rem;
  line-height: 1.6;
  padding: 20px 24px;
}
.footer__container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.footer__col p { margin: 0 0 8px; }
.site-footer a {
  color: #46b35e;
  text-decoration: none;
  font-weight: 500;
}
.site-footer a:hover { text-decoration: underline; color: #6ad67e; }
@media (max-width: 768px) {
  .footer__container { grid-template-columns: 1fr; gap: 14px; }
}

/* Responsive Design */
@media (max-width: 900px) { 
  .cards { 
    grid-template-columns: repeat(2, 1fr);
  }
  
  .hero {
    padding: 48px 0 32px;
  }
  
  .play, .guide, .features, .faq {
    padding: 40px 0;
  }
}

@media (max-width: 600px) { 
  .cards { 
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .hero { 
    padding-top: 32px; 
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .cta {
    flex-direction: column;
    align-items: center;
    gap: 8px;
  }
  
  .btn {
    width: 200px;
    text-align: center;
  }
  
  .site-header .container {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
  
  .nav {
    justify-content: center;
  }
  
  .nav a {
    margin: 0 8px;
  }
  
  .site-footer .container {
    flex-direction: column;
    text-align: center;
    gap: 8px;
  }
  
  .guide h2, .features h2, .faq h2 {
    font-size: 2rem;
  }
  
  .play h2 {
    font-size: 2rem;
  }
}

/* Focus states for accessibility */
.btn:focus,
.nav a:focus,
.logo:focus,
summary:focus {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}