/* PiManager Landing Page — Dark Cosmic Theme */
:root {
  --bg-deep: #0a0a1a;
  --bg-card: #111133;
  --accent: #6c5ce7;
  --accent-glow: #a78bfa;
  --text-primary: #e8e8f0;
  --text-secondary: #9898b8;
  --border: rgba(108, 92, 231, 0.2);
  --gradient-1: linear-gradient(135deg, #6c5ce7, #00d2ff);
  --gradient-2: linear-gradient(135deg, #667eea, #764ba2);
  --radius: 12px;
}

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

html {
  scroll-behavior: smooth;
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

/* Stars background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(1px 1px at 10% 20%, rgba(255,255,255,0.6), transparent),
    radial-gradient(1px 1px at 25% 60%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 40% 10%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 55% 45%, rgba(255,255,255,0.6), transparent),
    radial-gradient(1px 1px at 70% 80%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 85% 30%, rgba(255,255,255,0.4), transparent),
    radial-gradient(2px 2px at 15% 75%, rgba(108,92,231,0.5), transparent),
    radial-gradient(2px 2px at 50% 90%, rgba(0,210,255,0.4), transparent),
    radial-gradient(1px 1px at 60% 35%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 90% 55%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1px 1px at 5% 40%, rgba(108,92,231,0.4), transparent),
    radial-gradient(1px 1px at 35% 15%, rgba(255,255,255,0.5), transparent),
    radial-gradient(2px 2px at 75% 70%, rgba(0,210,255,0.3), transparent),
    radial-gradient(1px 1px at 20% 85%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 80% 5%, rgba(108,92,231,0.5), transparent),
    radial-gradient(1px 1px at 45% 50%, rgba(255,255,255,0.3), transparent);
  pointer-events: none;
}

body {
  position: relative;
  z-index: 1;
  min-height: 100vh;
}

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

/* Navigation */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 32px;
  max-width: 1100px;
  margin: 0 auto;
  position: relative;
  z-index: 10;
}
nav .logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}
nav .logo img { width: 36px; height: 36px; border-radius: 8px; }
nav .nav-links { display: flex; gap: 24px; align-items: center; }
nav .nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}
nav .nav-links a:hover { color: var(--text-primary); }
nav .nav-links .btn-ghost {
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: 8px;
  color: var(--text-primary);
}
nav .nav-links .btn-ghost:hover {
  border-color: var(--accent);
  background: rgba(108,92,231,0.1);
}

/* Hero */
.hero {
  text-align: center;
  padding: 80px 24px 60px;
  position: relative;
}
.hero .icon-lg {
  width: 96px;
  height: 96px;
  border-radius: 22px;
  margin-bottom: 24px;
  box-shadow: 0 0 60px rgba(108,92,231,0.3);
}
.hero h1 {
  font-size: 48px;
  font-weight: 800;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}
.hero .subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.hero .version-badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 13px;
  background: rgba(108,92,231,0.15);
  color: var(--accent-glow);
  margin-bottom: 32px;
}

/* Download button */
.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 40px;
  border-radius: 50px;
  font-size: 18px;
  font-weight: 700;
  text-decoration: none;
  color: #fff;
  background: var(--gradient-2);
  box-shadow: 0 4px 24px rgba(108,92,231,0.4);
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
  border: none;
}
.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(108,92,231,0.6);
}
.btn-download svg { width: 20px; height: 20px; }
.download-meta {
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-secondary);
}
.download-meta a { color: var(--accent-glow); text-decoration: none; }
.download-meta a:hover { text-decoration: underline; }

/* Features Section */
.features {
  padding: 60px 0 40px;
}
.features h2 {
  text-align: center;
  font-size: 32px;
  margin-bottom: 8px;
}
.features .section-desc {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 48px;
  font-size: 16px;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.3s, transform 0.2s;
}
.feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.feature-card .fc-icon {
  font-size: 28px;
  margin-bottom: 12px;
}
.feature-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
  color: var(--text-primary);
}
.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Install Section */
.install {
  padding: 40px 0 80px;
}
.install h2 {
  text-align: center;
  font-size: 32px;
  margin-bottom: 48px;
}
.install-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  position: relative;
}
.step .step-num {
  position: absolute;
  top: -16px;
  left: 24px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gradient-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 16px;
  color: #fff;
}
.step h3 {
  font-size: 17px;
  margin: 8px 0 10px;
}
.step p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.step code {
  display: block;
  background: rgba(0,0,0,0.3);
  padding: 10px 14px;
  border-radius: 6px;
  margin-top: 10px;
  font-size: 13px;
  color: var(--accent-glow);
  overflow-x: auto;
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
}
footer .footer-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--text-secondary);
}
footer a {
  color: var(--accent-glow);
  text-decoration: none;
}
footer a:hover { text-decoration: underline; }
footer .divider {
  width: 1px;
  height: 16px;
  background: var(--border);
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 32px; }
  .hero { padding: 48px 16px 36px; }
  .hero .icon-lg { width: 72px; height: 72px; }
  .feature-grid { grid-template-columns: 1fr; }
  .install-steps { grid-template-columns: 1fr; }
  nav { padding: 16px; }
  nav .nav-links { gap: 12px; }
  nav .nav-links .btn-ghost { padding: 6px 12px; font-size: 13px; }
}