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

:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: #1a2035;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.15);
  --border: rgba(148, 163, 184, 0.1);
  --gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #a78bfa);
  --radius: 12px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* ===== Header ===== */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(10, 14, 26, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
  transition: var(--transition);
}
.header .container { display: flex; align-items: center; justify-content: space-between; }
.logo { font-size: 1.5rem; font-weight: 700; text-decoration: none; color: var(--text-primary); }
.logo-accent { color: var(--accent); }
.nav { display: flex; align-items: center; gap: 32px; }
.nav-link { color: var(--text-secondary); text-decoration: none; font-size: 0.95rem; transition: var(--transition); }
.nav-link:hover { color: var(--text-primary); }

.cta-btn {
  background: var(--gradient); color: white; border: none;
  padding: 10px 24px; border-radius: 8px; font-weight: 600; cursor: pointer;
  transition: var(--transition); font-size: 0.95rem;
}
.cta-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 20px var(--accent-glow); }

.mobile-toggle {
  display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 4px;
}
.mobile-toggle span { width: 24px; height: 2px; background: var(--text-primary); transition: var(--transition); }

/* ===== Hero ===== */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  padding: 120px 0 80px;
  background: radial-gradient(ellipse at 50% 0%, rgba(99, 102, 241, 0.1) 0%, transparent 60%);
}
.hero-content { max-width: 800px; margin: 0 auto; text-align: center; }
.hero h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); font-weight: 800; line-height: 1.1; margin-bottom: 24px; letter-spacing: -0.02em; }
.gradient-text {
  background: var(--gradient); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.hero p { font-size: 1.25rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto 40px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 64px; }

.btn {
  padding: 14px 32px; border-radius: 10px; font-weight: 600;
  font-size: 1rem; cursor: pointer; transition: var(--transition); border: none;
}
.btn-primary { background: var(--gradient); color: white; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(99, 102, 241, 0.3); }
.btn-outline { background: transparent; color: var(--text-primary); border: 1px solid var(--border); }
.btn-outline:hover { border-color: var(--accent); background: var(--accent-glow); }
.btn-full { width: 100%; }

.hero-stats { display: flex; gap: 48px; justify-content: center; flex-wrap: wrap; }
.stat { text-align: center; }
.stat-number { display: block; font-size: 2rem; font-weight: 700; color: var(--accent-light); }
.stat-label { font-size: 0.875rem; color: var(--text-secondary); }

/* ===== Features ===== */
.features { padding: 120px 0; }
.section-header { text-align: center; margin-bottom: 64px; }
.section-header h2 { font-size: 2.5rem; font-weight: 700; margin-bottom: 16px; }
.section-header p { font-size: 1.125rem; color: var(--text-secondary); }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px; transition: var(--transition);
}
.feature-card:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: 0 8px 40px var(--accent-glow); }
.feature-icon { width: 48px; height: 48px; color: var(--accent-light); margin-bottom: 20px; }
.feature-icon svg { width: 100%; height: 100%; }
.feature-card h3 { font-size: 1.25rem; margin-bottom: 12px; }
.feature-card p { color: var(--text-secondary); font-size: 0.95rem; }

/* ===== About ===== */
.about { padding: 120px 0; background: var(--bg-secondary); }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.about-text h2 { font-size: 2.5rem; font-weight: 700; margin-bottom: 20px; }
.about-text p { color: var(--text-secondary); margin-bottom: 24px; font-size: 1.05rem; }
.about-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.about-list li {
  padding-left: 28px; position: relative; color: var(--text-secondary);
}
.about-list li::before {
  content: ''; position: absolute; left: 0; top: 8px;
  width: 8px; height: 8px; background: var(--accent); border-radius: 50%;
}
.visual-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 40px; text-align: center;
}
.visual-card h4 { font-size: 1.5rem; margin-bottom: 32px; }
.network-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.net-stat span { display: block; font-size: 1.75rem; font-weight: 700; color: var(--accent-light); }
.net-stat small { color: var(--text-secondary); font-size: 0.85rem; }

/* ===== Contact ===== */
.contact { padding: 120px 0; }
.contact-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 64px; }
.contact-form { display: flex; flex-direction: column; gap: 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label { font-size: 0.9rem; font-weight: 500; color: var(--text-secondary); }
.form-group input, .form-group textarea {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px;
  padding: 12px 16px; color: var(--text-primary); font-size: 1rem;
  transition: var(--transition); font-family: inherit;
}
.form-group input:focus, .form-group textarea:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-status { text-align: center; font-size: 0.9rem; min-height: 24px; }
.form-status.success { color: #34d399; }
.form-status.error { color: #f87171; }

.contact-info { display: flex; flex-direction: column; gap: 32px; }
.info-item h4 { font-size: 1.1rem; margin-bottom: 8px; color: var(--text-primary); }
.info-item p { color: var(--text-secondary); }

/* ===== Footer ===== */
.footer { padding: 64px 0 32px; border-top: 1px solid var(--border); background: var(--bg-secondary); }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-col .logo { display: inline-block; margin-bottom: 16px; }
.footer-col p { color: var(--text-secondary); font-size: 0.9rem; }
.footer-col h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 16px; color: var(--text-primary); }
.footer-col a { display: block; color: var(--text-secondary); text-decoration: none; font-size: 0.9rem; padding: 4px 0; transition: var(--transition); }
.footer-col a:hover { color: var(--accent-light); }
.footer-bottom { text-align: center; padding-top: 32px; border-top: 1px solid var(--border); }
.footer-bottom p { color: var(--text-secondary); font-size: 0.85rem; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav { display: none; position: fixed; top: 72px; left: 0; right: 0; background: var(--bg-secondary);
    flex-direction: column; padding: 24px; gap: 16px; border-bottom: 1px solid var(--border); }
  .nav.active { display: flex; }
  .mobile-toggle { display: flex; }
  .feature-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 24px; }
  .network-stats { grid-template-columns: 1fr; gap: 16px; }
}