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

:root {
  --blue: #0066cc;
  --blue-dark: #004fa3;
  --blue-light: #e8f0fb;
  --bg: #f6f8fb;
  --white: #ffffff;
  --text: #1a2340;
  --text-muted: #5a6585;
  --border: #e2e8f4;
  --shadow: 0 2px 16px rgba(0, 102, 204, 0.08);
  --shadow-card: 0 4px 24px rgba(0, 40, 100, 0.07);
  --radius: 12px;
  --max-width: 1100px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* =============================================
   Layout
   ============================================= */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* =============================================
   Header
   ============================================= */
.header {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 8px rgba(0, 40, 100, 0.05);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--blue);
  text-transform: uppercase;
  flex-shrink: 0;
}

.nav {
  display: flex;
  gap: 8px;
}

.nav-link {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 8px;
  transition: color 0.18s, background 0.18s;
}

.nav-link:hover {
  color: var(--blue);
  background: var(--blue-light);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 22px;
  color: var(--text);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  transition: background 0.15s;
}

.nav-toggle:hover {
  background: var(--blue-light);
  color: var(--blue);
}

.mobile-nav {
  display: none;
  flex-direction: column;
  border-top: 1px solid var(--border);
  background: var(--white);
  padding: 8px 24px 16px;
  gap: 4px;
}

.mobile-nav.open {
  display: flex;
}

.mobile-nav .nav-link {
  padding: 10px 12px;
  font-size: 15px;
}

/* =============================================
   Hero
   ============================================= */
.hero {
  background: linear-gradient(135deg, #f0f5ff 0%, var(--bg) 60%);
  padding: 96px 0 80px;
  border-bottom: 1px solid var(--border);
}

.hero-inner {
  max-width: 680px;
}

.hero-badge {
  display: inline-block;
  background: var(--blue-light);
  color: var(--blue);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 5px 14px;
  border-radius: 100px;
  margin-bottom: 24px;
}

.hero-headline {
  font-size: clamp(36px, 6vw, 58px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 16px;
}

.hero-subheadline {
  font-size: clamp(18px, 2.5vw, 22px);
  font-weight: 400;
  color: var(--blue);
  margin-bottom: 20px;
  line-height: 1.4;
}

.hero-description {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 560px;
}

.btn-primary {
  display: inline-block;
  background: var(--blue);
  color: var(--white);
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  padding: 13px 30px;
  border-radius: 10px;
  transition: background 0.18s, transform 0.12s, box-shadow 0.18s;
  box-shadow: 0 4px 14px rgba(0, 102, 204, 0.25);
}

.btn-primary:hover {
  background: var(--blue-dark);
  box-shadow: 0 6px 20px rgba(0, 102, 204, 0.35);
  transform: translateY(-1px);
}

/* =============================================
   Features
   ============================================= */
.features {
  padding: 80px 0;
}

.section-title {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  color: var(--text);
  text-align: center;
  margin-bottom: 48px;
  letter-spacing: -0.01em;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px 28px;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0, 40, 100, 0.12);
}

.card-icon {
  width: 52px;
  height: 52px;
  background: var(--blue-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.card-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 10px;
}

.card-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
}

/* =============================================
   CTA
   ============================================= */
.cta {
  background: var(--white);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 72px 0;
}

.cta-inner {
  text-align: center;
  max-width: 560px;
  margin: 0 auto;
}

.cta-icon {
  width: 68px;
  height: 68px;
  background: var(--blue-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
}

.cta-title {
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.cta-text {
  font-size: 17px;
  color: var(--text);
  font-weight: 500;
  margin-bottom: 8px;
}

.cta-subtext {
  font-size: 14px;
  color: var(--text-muted);
}

/* =============================================
   Footer
   ============================================= */
.footer {
  background: var(--bg);
  padding: 28px 0;
}

.footer-inner {
  text-align: center;
}

.footer-text {
  font-size: 13px;
  color: var(--text-muted);
}

/* =============================================
   Responsive
   ============================================= */
@media (max-width: 768px) {
  .nav {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .hero {
    padding: 64px 0 56px;
  }

  .cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .card {
    padding: 28px 22px;
  }

  .features {
    padding: 60px 0;
  }

  .cta {
    padding: 56px 0;
  }
}

@media (max-width: 480px) {
  .logo {
    font-size: 11px;
  }

  .hero-headline {
    font-size: 32px;
  }
}