/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #fafafa;
  --bg-dark: #0c1220;
  --bg-card: #ffffff;
  --bg-card-dark: #141e33;
  --text: #1a1a2e;
  --text-muted: #5a6072;
  --text-light: #e0e4ec;
  --text-light-muted: #8b92a8;
  --accent: #1a56db;
  --accent-light: #3b7dff;
  --accent-subtle: #e8f0fe;
  --border: #e2e5ec;
  --border-dark: #1e2d4a;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.04);
  --shadow-lg: 0 4px 24px rgba(0,0,0,0.08);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition: 0.2s ease;
}

html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.6; -webkit-font-smoothing: antialiased; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* === Navigation === */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(250,250,250,0.85); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.nav.scrolled { background: rgba(250,250,250,0.95); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }

.logo { text-decoration: none; font-weight: 800; font-size: 1.25rem; color: var(--text); letter-spacing: -0.02em; display: flex; align-items: center; gap: 6px; }
.logo-icon { color: var(--accent); font-size: 1rem; }
.logo-dot { color: var(--accent); }

.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { text-decoration: none; color: var(--text-muted); font-size: 0.875rem; font-weight: 500; transition: color var(--transition); }
.nav-links a:hover { color: var(--text); }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--text); margin: 4px 0; transition: var(--transition); border-radius: 1px; }

/* === Buttons === */
.btn {
  display: inline-flex; align-items: center; padding: 12px 24px;
  font-size: 0.9rem; font-weight: 600; font-family: var(--font);
  text-decoration: none; border-radius: var(--radius-sm);
  transition: all var(--transition); cursor: pointer; border: none;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-light); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(26,86,219,0.3); }
.btn-outline { background: transparent; color: var(--text); border: 1.5px solid var(--border); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { padding: 8px 16px; font-size: 0.8rem; }

.section-cta .btn-outline { color: var(--text-light); border-color: rgba(255,255,255,0.25); }
.section-cta .btn-outline:hover { border-color: #fff; color: #fff; }

/* === Hero === */
.hero {
  padding: 160px 0 100px;
  text-align: center;
  background: linear-gradient(180deg, #f0f4ff 0%, var(--bg) 100%);
}
.hero-badge {
  display: inline-block; padding: 6px 16px;
  background: var(--accent-subtle); color: var(--accent);
  font-size: 0.8rem; font-weight: 600; border-radius: 20px;
  margin-bottom: 24px; letter-spacing: 0.02em;
}
.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800; line-height: 1.1;
  letter-spacing: -0.03em; color: var(--text);
  margin-bottom: 20px;
}
.hero-sub {
  font-size: 1.15rem; color: var(--text-muted);
  max-width: 640px; margin: 0 auto 36px; line-height: 1.7;
}
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 60px; }

.hero-stats {
  display: flex; justify-content: center; gap: 48px; flex-wrap: wrap;
  padding-top: 48px; border-top: 1px solid var(--border);
  max-width: 700px; margin: 0 auto;
}
.stat { text-align: center; }
.stat-value { display: block; font-size: 1.5rem; font-weight: 800; color: var(--text); letter-spacing: -0.02em; }
.stat-label { font-size: 0.78rem; color: var(--text-muted); font-weight: 500; }

/* === Sections === */
.section { padding: 100px 0; }
.section-dark { background: var(--bg-dark); color: var(--text-light); }
.section-dark .section-sub { color: var(--text-light-muted); }

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800; letter-spacing: -0.03em;
  text-align: center; margin-bottom: 12px;
}
.section-sub {
  text-align: center; color: var(--text-muted);
  max-width: 600px; margin: 0 auto 56px; font-size: 1.05rem;
}

/* === Audience Grid === */
.audience-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.audience-card {
  background: var(--bg-card-dark); border: 1px solid var(--border-dark);
  border-radius: var(--radius); padding: 32px;
  transition: transform var(--transition), border-color var(--transition);
}
.audience-card:hover { transform: translateY(-2px); border-color: var(--accent); }
.audience-icon { font-size: 1.5rem; margin-bottom: 12px; }
.audience-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.audience-card p { font-size: 0.9rem; color: var(--text-light-muted); line-height: 1.6; }

/* === Platform Grid === */
.platform-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.platform-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 36px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.platform-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.platform-number { font-size: 0.75rem; font-weight: 700; color: var(--accent); margin-bottom: 12px; letter-spacing: 0.05em; }
.platform-card h3 { font-size: 1.35rem; font-weight: 800; margin-bottom: 4px; letter-spacing: -0.01em; }
.platform-tagline { font-size: 0.85rem; color: var(--accent); font-weight: 600; margin-bottom: 12px; }
.platform-card > p { font-size: 0.92rem; color: var(--text-muted); line-height: 1.65; margin-bottom: 16px; }

.feature-list { list-style: none; padding: 0; }
.feature-list li {
  font-size: 0.85rem; color: var(--text-muted); padding: 4px 0 4px 20px;
  position: relative;
}
.feature-list li::before {
  content: ''; position: absolute; left: 0; top: 12px;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
}

/* === Architecture Layers === */
.arch-layers { max-width: 720px; margin: 0 auto; }
.arch-layer {
  display: flex; gap: 24px; align-items: flex-start;
  background: var(--bg-card-dark); border: 1px solid var(--border-dark);
  border-radius: var(--radius); padding: 28px 32px;
  transition: border-color var(--transition);
}
.arch-layer:hover { border-color: var(--accent); }
.arch-tier {
  flex-shrink: 0; width: 90px; text-align: center;
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--accent-light);
  padding-top: 4px;
}
.arch-content h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 6px; }
.arch-content p { font-size: 0.88rem; color: var(--text-light-muted); line-height: 1.6; }
.arch-connector { width: 2px; height: 24px; background: var(--border-dark); margin: 0 auto; }

/* === Security Chain === */
.chain-grid {
  display: flex; align-items: stretch; gap: 0; margin-bottom: 56px;
  flex-wrap: wrap; justify-content: center;
}
.chain-card {
  flex: 1; min-width: 240px; max-width: 340px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px;
}
.chain-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.chain-card p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.6; }
.chain-step {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--accent); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 700; margin-bottom: 16px;
}
.chain-arrow {
  display: flex; align-items: center; padding: 0 12px;
  font-size: 1.5rem; color: var(--accent); font-weight: 300;
}

/* === Threat Table === */
.threat-table-wrap { overflow-x: auto; }
.threat-table {
  width: 100%; border-collapse: collapse;
  font-size: 0.88rem; background: var(--bg-card);
  border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow);
}
.threat-table th {
  text-align: left; padding: 14px 20px;
  background: var(--accent-subtle); color: var(--accent);
  font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em;
}
.threat-table td { padding: 14px 20px; border-bottom: 1px solid var(--border); }
.threat-table tr:last-child td { border-bottom: none; }
.threat-table td:first-child { font-weight: 600; color: var(--text); }
.threat-table td:nth-child(2) { color: #b44; }
.threat-table td:nth-child(3) { color: var(--accent); font-weight: 500; }

/* === Compliance Grid === */
.compliance-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.compliance-card {
  background: var(--bg-card-dark); border: 1px solid var(--border-dark);
  border-radius: var(--radius); padding: 28px;
  transition: border-color var(--transition);
}
.compliance-card:hover { border-color: var(--accent); }
.compliance-card h3 { font-size: 1rem; font-weight: 700; color: var(--accent-light); margin-bottom: 8px; }
.compliance-card p { font-size: 0.85rem; color: var(--text-light-muted); line-height: 1.6; }

/* === Open Source === */
.oss-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
  margin-bottom: 48px;
}
.oss-item {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 20px;
  display: flex; flex-direction: column; gap: 4px;
}
.oss-item strong { font-size: 0.95rem; color: var(--text); }
.oss-item span { font-size: 0.78rem; color: var(--text-muted); }

.sovereignty-box {
  background: var(--accent-subtle); border: 1px solid rgba(26,86,219,0.15);
  border-radius: var(--radius); padding: 36px;
  text-align: center;
}
.sovereignty-box h3 { font-size: 1.2rem; font-weight: 700; color: var(--text); margin-bottom: 12px; }
.sovereignty-box p { font-size: 0.92rem; color: var(--text-muted); max-width: 700px; margin: 0 auto; line-height: 1.7; }

/* === CTA === */
.section-cta {
  background: var(--bg-dark); color: var(--text-light);
  text-align: center; padding: 80px 0;
}
.section-cta h2 { font-size: clamp(1.75rem, 3vw, 2.25rem); font-weight: 800; letter-spacing: -0.02em; margin-bottom: 12px; }
.section-cta p { color: var(--text-light-muted); max-width: 520px; margin: 0 auto 32px; font-size: 1rem; }

/* === Footer === */
.footer { background: #080e1a; color: var(--text-light-muted); padding: 60px 0 32px; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 48px; }
.footer-brand { flex: 1; min-width: 200px; }
.footer-brand .logo-icon, .footer-brand .logo-dot { color: var(--accent-light); }
.footer-brand p { margin-top: 8px; font-size: 0.85rem; }
.footer-links { display: flex; gap: 48px; }
.footer-links div { display: flex; flex-direction: column; gap: 6px; }
.footer-links h4 { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-light); margin-bottom: 4px; }
.footer-links a { text-decoration: none; font-size: 0.85rem; color: var(--text-light-muted); transition: color var(--transition); }
.footer-links a:hover { color: var(--text-light); }
.footer-bottom { width: 100%; padding-top: 32px; margin-top: 32px; border-top: 1px solid var(--border-dark); }
.footer-bottom p { font-size: 0.78rem; }

/* === Responsive === */
@media (max-width: 900px) {
  .platform-grid, .compliance-grid, .audience-grid { grid-template-columns: 1fr; }
  .oss-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-stats { gap: 32px; }
  .arch-layer { flex-direction: column; gap: 12px; }
  .arch-tier { width: auto; text-align: left; }
  .chain-arrow { display: none; }
  .chain-grid { flex-direction: column; align-items: center; gap: 16px; }
  .chain-card { max-width: 100%; }
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: 64px; left: 0; right: 0;
    background: var(--bg); border-bottom: 1px solid var(--border);
    padding: 16px 24px; gap: 16px;
  }
  .nav-toggle { display: block; }
  .hero { padding: 120px 0 72px; }
  .hero h1 { font-size: 2rem; }
  .section { padding: 64px 0; }
  .oss-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; gap: 32px; }
  .footer-links { flex-direction: column; gap: 24px; }
}