:root {
  --bg: #000;
  --text: #fff;
  --dim: #9ca3af;
  --border: rgba(255,255,255,0.1);
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  position: relative;
}

/* ===== BACKGROUND LAYERS ===== */
#stars {
  position: fixed;
  top: 0; left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -3;
  background: radial-gradient(circle at center, #050010 0%, #000 100%);
}

/* --- Enhanced nebula effect --- */
body::before {
  content: '';
  position: fixed;
  top: -60%;
  left: -60%;
  width: 220%;
  height: 220%;
  background:
    radial-gradient(circle at 30% 70%, rgba(180,80,255,0.15) 0%, transparent 60%),
    radial-gradient(circle at 80% 30%, rgba(0,150,255,0.1) 0%, transparent 55%),
    radial-gradient(circle at 50% 45%, rgba(255,120,255,0.08) 0%, transparent 70%),
    radial-gradient(circle at 20% 30%, rgba(100,50,255,0.08) 0%, transparent 60%),
    radial-gradient(circle at 70% 80%, rgba(255,80,200,0.06) 0%, transparent 70%);
  mix-blend-mode: screen;
  filter: blur(120px) saturate(150%);
  animation: nebulaGlow 180s ease-in-out infinite alternate;
  z-index: -2;
  pointer-events: none;
  opacity: 0.8;
}

@keyframes nebulaGlow {
  0% { transform: scale(1) rotate(0deg); opacity: 0.7; filter: blur(100px) saturate(130%); }
  50% { transform: scale(1.3) rotate(30deg); opacity: 1; filter: blur(120px) saturate(180%); }
  100% { transform: scale(1.15) rotate(60deg); opacity: 0.85; filter: blur(100px) saturate(140%); }
}

/* ===== HEADER ===== */
header {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: rgba(0,0,0,0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  padding: 14px 0;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
}

.logo-icon svg {
  width: 28px;
  height: 28px;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  color: var(--dim);
  text-decoration: none;
  transition: color .3s;
}

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

.lang-switcher {
  display: flex;
  gap: 8px;
  background: rgba(255,255,255,0.1);
  border-radius: 16px;
  padding: 4px;
}

.lang-btn {
  border: none;
  background: transparent;
  color: var(--dim);
  cursor: pointer;
  padding: 4px 10px;
  border-radius: 10px;
  transition: all .3s;
}

.lang-btn.active {
  background: rgba(255,255,255,0.2);
  color: var(--text);
}

/* ===== MAIN ===== */
main {
      padding-top: 140px;
  text-align: center;
}
.intro h1 {
  font-size: 2.8rem;
  font-weight: 300;
  margin-bottom: 10px;
  text-shadow: 0 0 20px rgba(255,255,255,0.08);
}

.subtitle {
  font-size: 1.2rem;
  color: var(--dim);
  margin-bottom: 40px;
}

.platforms {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin-bottom: 80px;
}

.platform-link {
  border: 1px solid var(--border);
  padding: 12px 24px;
  border-radius: 10px;
  text-decoration: none;
  color: var(--text);
  transition: all .3s;
}

.platform-link:hover {
  background: rgba(255,255,255,0.05);
  box-shadow: 0 0 12px rgba(150,150,255,0.1);
}

/* ===== TOPICS ===== */
.topics {
  max-width: 1000px;
  margin: 0 auto 80px;
}

.topics h2 {
  font-size: 1rem;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 30px;
  letter-spacing: 2px;
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
}

.topic-card {
  border: 1px solid var(--border);
  padding: 25px;
  border-radius: 12px;
  background: rgba(255,255,255,0.02);
  transition: all .3s;
  box-shadow: 0 0 20px rgba(255,255,255,0.03);
}

.topic-card:hover {
  border-color: rgba(255,255,255,0.3);
  transform: translateY(-3px);
  box-shadow: 0 0 30px rgba(180,120,255,0.08);
}

/* ===== FOOTER ===== */
footer {
  text-align: center;
  padding: 40px 0;
  border-top: 1px solid var(--border);
  color: var(--dim);
  font-size: 0.9rem;
}

footer a {
  color: var(--dim);
  text-decoration: none;
}
footer a:hover {
  color: var(--text);
}