:root {
  --primary: #0ea5e9;
  --primary-hover: #0284c7;
  --secondary: #f43f5e;
  --accent: #facc15;
  --dark: #0f172a;
  --dark-light: #1e293b;
  --text: #475569;
  --light: #f8fafc;
  --white: #ffffff;
  --radius: 16px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

body {
  font-family: var(--font);
  color: var(--text);
  background-color: var(--light);
  line-height: 1.6;
}

a { text-decoration: none; color: inherit; }

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

header {
  background-color: var(--white);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.nav-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  font-weight: 600;
  color: var(--dark-light);
  transition: color 0.2s;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--primary);
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 700;
  text-align: center;
  transition: transform 0.2s, background-color 0.2s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--white);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: var(--accent);
  color: var(--dark);
}

.btn-secondary:hover {
  background-color: #eab308;
  transform: translateY(-2px);
}

.hero {
  padding: 80px 0;
  background-color: var(--dark);
  color: var(--white);
  text-align: center;
  overflow: hidden;
  position: relative;
}

.hero h1 {
  font-size: 48px;
  font-weight: 900;
  margin-bottom: 20px;
  line-height: 1.2;
}

.hero p {
  font-size: 18px;
  color: #cbd5e1;
  max-width: 600px;
  margin: 0 auto 30px;
}

.hero-img-container {
  margin-top: 40px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.hero-img-container img {
  width: 100%;
  display: block;
}

.section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  font-size: 32px;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 48px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background: var(--white);
  padding: 32px;
  border-radius: var(--radius);
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
  text-align: center;
}

.feature-card h3 {
  font-size: 20px;
  color: var(--dark);
  margin-bottom: 12px;
}

.split-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.newsletter {
  background-color: var(--primary);
  color: var(--white);
  padding: 60px 0;
  text-align: center;
}

.newsletter-form {
  display: flex;
  max-width: 500px;
  margin: 24px auto 0;
  gap: 8px;
}

.newsletter-input {
  flex-grow: 1;
  padding: 14px 20px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-family: inherit;
}

.footer {
  background-color: var(--dark);
  color: #94a3b8;
  padding: 40px 0;
  text-align: center;
  border-top: 1px solid #334155;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 20px;
}

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.8);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}
.modal-content {
  background: var(--white);
  padding: 40px;
  border-radius: var(--radius);
  text-align: center;
  max-width: 400px;
  width: 90%;
}
.modal-content h3 { color: var(--dark); margin-bottom: 12px; }

@media (max-width: 768px) {
  .features-grid { grid-template-columns: 1fr; }
  .split-layout { grid-template-columns: 1fr; text-align: center; }
  .newsletter-form { flex-direction: column; }
}