/* ══════════════════════════════════════════════
   FD Commander - Shared Styles
   ══════════════════════════════════════════════ */

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

:root {
  --bg-primary: #191e24;
  --bg-secondary: #15191e;
  --bg-card: #1d232a;
  --bg-card-hover: #242c35;
  --border: #2a3441;
  --text-primary: #ecf9ff;
  --text-secondary: #94a3b8;
  --text-muted: #7a8ba0;
  --accent: #4a8df7;
  --accent-glow: rgba(60, 131, 246, 0.1);
  --accent-green: #4caf50;
  --accent-pine: #2d8b4e;
  --accent-emerald: #34d399;
  --accent-teal: #42a5f5;
  --accent-sky: #4a8df7;
  --accent-ice: #7eb0f0;
  --accent-gold: #f0a830;
  --accent-orange: #fb923c;
  --accent-rose: #fb7185;
  --gradient-start: #4a8df7;
  --gradient-end: #4caf50;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: #7eb0f0; }

/* ── TOPO BACKGROUND ── */
.topo-bg {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none; z-index: 0; opacity: 0.03;
  background-image:
    repeating-radial-gradient(circle at 20% 50%, transparent 0, transparent 40px, rgba(60,131,246,0.3) 40px, rgba(60,131,246,0.3) 41px, transparent 41px, transparent 80px),
    repeating-radial-gradient(circle at 80% 30%, transparent 0, transparent 60px, rgba(74,173,232,0.2) 60px, rgba(74,173,232,0.2) 61px, transparent 61px, transparent 120px),
    repeating-radial-gradient(circle at 50% 80%, transparent 0, transparent 50px, rgba(76,175,80,0.2) 50px, rgba(76,175,80,0.2) 51px, transparent 51px, transparent 100px);
}

/* ── NAV ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(25, 30, 36, 0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2rem; height: 64px;
}
a.logo, .logo {
  display: flex; align-items: center; gap: 0.6rem;
  font-weight: 700; font-size: 1.15rem; color: var(--text-primary);
  text-decoration: none;
}
a.logo:hover { color: var(--text-primary); }
.logo-icon {
  width: 32px; height: 32px; border-radius: 6px;
  object-fit: contain;
}
.nav-links { display: flex; gap: 2rem; align-items: center; }
.nav-links a { color: var(--text-secondary); font-size: 0.9rem; font-weight: 500; }
.nav-links a:hover { color: var(--text-primary); }
.nav-links a.active { color: var(--accent-sky); }
a.btn-nav, .btn-nav {
  background: var(--accent);
  color: #15191e !important;
  padding: 0.5rem 1.2rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.85rem;
  transition: all 0.2s;
}
a.btn-nav:hover, .btn-nav:hover { background: #7eb0f0; color: #15191e !important; transform: translateY(-1px); }

/* ── SECTION SHARED ── */
section { padding: 6rem 2rem; position: relative; z-index: 1; }
.container { max-width: 1200px; margin: 0 auto; }
.section-label {
  font-size: 0.8rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--accent-sky); margin-bottom: 0.75rem;
}
.section-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 800; line-height: 1.2;
  margin-bottom: 1rem; letter-spacing: -0.01em;
}
.section-desc {
  font-size: 1.05rem; color: var(--text-secondary);
  max-width: 560px; line-height: 1.7;
}

/* ── PAGE HERO (features, docs) ── */
.page-hero {
  padding: 9rem 2rem 4rem;
  text-align: center;
  position: relative;
}
.page-hero::before {
  content: '';
  position: absolute; top: -100px; left: 50%; transform: translateX(-50%);
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(74,173,232,0.06) 0%, rgba(52,211,153,0.04) 40%, transparent 70%);
  pointer-events: none;
}
.page-hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800; line-height: 1.15;
  margin-bottom: 1rem; letter-spacing: -0.02em;
  position: relative; z-index: 1;
}
.page-hero h1 .gradient {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-hero p {
  max-width: 580px; margin: 0 auto;
  font-size: 1.1rem; color: var(--text-secondary); line-height: 1.7;
  position: relative; z-index: 1;
}

/* ── BUTTONS ── */
.btn-primary {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #15191e; font-weight: 700; font-size: 1rem;
  padding: 0.85rem 2rem; border-radius: 10px; border: none; cursor: pointer;
  transition: all 0.25s; box-shadow: 0 4px 24px rgba(251, 191, 36, 0.2);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(251, 191, 36, 0.3); }
.btn-secondary {
  background: var(--bg-card); color: var(--text-primary);
  font-weight: 600; font-size: 1rem;
  padding: 0.85rem 2rem; border-radius: 10px;
  border: 1px solid var(--border); cursor: pointer;
  transition: all 0.25s;
}
.btn-secondary:hover { background: var(--bg-card-hover); border-color: var(--accent-green); transform: translateY(-2px); }

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--border);
  padding: 3rem 2rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  position: relative; z-index: 1;
}
.footer-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 1rem;
}
.footer-links { display: flex; gap: 1.5rem; align-items: center; }
.footer-links a { color: var(--text-muted); }
.footer-links a:hover { color: var(--text-secondary); }
.footer-call { font-family: 'JetBrains Mono', monospace; color: var(--text-muted); font-size: 0.8rem; }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  section { padding: 4rem 1.5rem; }
  .page-hero { padding: 8rem 1.5rem 3rem; }
}