:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --primary: #1f3a5f;
  --secondary: #00b5d8;
  --accent: #25d366; /* WhatsApp green */
  --expensive: #f59e0b;
  --cheap: #22c55e;
  --shadow: 0 10px 30px rgba(2, 6, 23, 0.08);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid rgba(15, 23, 42, 0.06);
}
.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}
.brand {
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: 0.2px;
}
.nav { display: none; gap: 20px; }
.nav-link {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
}
.nav-link:hover { color: var(--text); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: 10px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease, color 180ms ease;
  will-change: transform;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }

.btn-primary { background: var(--primary); color: #fff; }
.btn-outline { border: 2px solid var(--primary); color: var(--primary); background: transparent; }
.btn-secondary { background: var(--secondary); color: #03202b; }
.btn-whatsapp { background: var(--accent); color: #012d16; }
.btn.big { padding: 16px 22px; font-size: 1.05rem; }

/* Hero */
.hero {
  background: radial-gradient(1200px 400px at 10% 0%, rgba(31,58,95,0.10), transparent),
              radial-gradient(900px 300px at 90% 0%, rgba(0,181,216,0.12), transparent);
  padding: 64px 0 40px;
}
.hero-content { text-align: center; }
.hero h1 {
  font-size: clamp(1.8rem, 3.8vw, 3rem);
  line-height: 1.2;
  margin: 0 0 12px;
}
.hero-sub { color: var(--muted); margin: 0 0 22px; }
.hero-actions { display: inline-flex; gap: 12px; flex-wrap: wrap; }

/* Sections */
.section { padding: 56px 0; }
.section h2 { font-size: clamp(1.4rem, 3vw, 2rem); margin: 0 0 8px; }
.section-intro { color: var(--muted); margin-bottom: 24px; }

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.card {
  background: var(--surface);
  border: 1px solid rgba(15, 23, 42, 0.06);
  border-radius: 16px;
  padding: 22px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
.card h3 { margin-top: 8px; margin-bottom: 8px; }
.card p { color: var(--muted); }
.card-list { margin: 12px 0 18px; padding-left: 18px; }
.card-list li { margin: 6px 0; }
.card-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 14px;
  height: 14px;
  padding: 0;
  border-radius: 999px;
  box-shadow: 0 1px 6px rgba(2, 6, 23, 0.15);
}
.badge-cheap { background: rgba(34, 197, 94, 0.9); border: 1px solid rgba(34, 197, 94, 0.9); }
.badge-expensive { background: rgba(245, 158, 11, 0.9); border: 1px solid rgba(245, 158, 11, 0.9); }
.card:hover { transform: translateY(-2px); box-shadow: 0 18px 40px rgba(2,6,23,0.10); }

/* Features */
.features {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}
.feature {
  background: var(--surface);
  border: 1px solid rgba(15, 23, 42, 0.06);
  border-radius: 16px;
  padding: 18px;
}
.feature-icon { font-size: 1.4rem; }
.feature h3 { margin: 10px 0 6px; font-size: 1rem; }
.feature p { color: var(--muted); margin: 0; }

/* Contact */
.contact { text-align: center; }

/* Footer */
.site-footer { padding: 30px 0; color: var(--muted); border-top: 1px solid rgba(15, 23, 42, 0.06); }
.site-footer p { text-align: center; margin: 0; }

/* Reveal animation */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 500ms ease, transform 500ms ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (min-width: 820px) {
  .nav { display: flex; }
}

@media (max-width: 760px) {
  .cards { grid-template-columns: 1fr; }
  .features { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .features { grid-template-columns: 1fr; }
  .hero-actions { justify-content: center; }
}