:root {
  --primary: #007aff;
  --primary-dark: #0056b3;
  --bg: #ffffff;
  --text: #1d1d1f;
  --text-muted: #86868b;
  --section-bg: #f5f5f7;
  --card-bg: #ffffff;
  --border: rgba(0, 0, 0, 0.1);
  --container-width: 1100px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    Helvetica,
    Arial,
    sans-serif;
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* Navigation */
nav {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  z-index: 1000;
  border-bottom: 1px solid var(--border);
  height: 64px;
  display: flex;
  align-items: center;
}

nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 1.25rem;
}

.links {
  display: flex;
  gap: 2rem;
}

.links a {
  text-decoration: none;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* Hero Section */
.hero {
  padding: 8rem 0;
  overflow: hidden;
}

.hero .container {
  display: flex;
  align-items: center;
  gap: 4rem;
}

.hero-content {
  flex: 1;
}

.hero-content h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.accent {
  color: var(--primary);
  background: linear-gradient(135deg, #007aff 0%, #00c6ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  max-width: 500px;
}

.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 99px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.2s;
}

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

.btn.primary:hover {
  transform: scale(1.05);
  background: #000;
}

.requirement {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 1rem;
}

.hero-image {
  flex: 1.2;
}

.app-screenshot {
  width: 100%;
  height: auto;
  border-radius: 12px;
  /* The image already has a shadow, but we can add a slight lift */
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.15));
  transition: transform 0.5s ease;
}

.app-screenshot:hover {
  transform: translateY(-10px) scale(1.02);
}

/* Features */
.features {
  padding: 8rem 0;
  background: var(--section-bg);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.section-header p {
  font-size: 1.25rem;
  color: var(--text-muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: var(--card-bg);
  padding: 2.5rem;
  border-radius: 24px;
  transition: all 0.3s;
  border: 1px solid transparent;
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  border-color: var(--primary);
}

.f-icon {
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Privacy */
.privacy {
  padding: 8rem 0;
}

.privacy-box {
  background: linear-gradient(135deg, #1d1d1f 0%, #434345 100%);
  color: white;
  padding: 4rem;
  border-radius: 32px;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.p-icon {
  font-size: 3rem;
  margin-bottom: 1.5rem;
}

.privacy-box h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.privacy-box p {
  font-size: 1.1rem;
  opacity: 0.8;
}

/* Footer */
footer {
  padding: 4rem 0 2rem;
  border-top: 1px solid var(--border);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  margin-bottom: 4rem;
}

.footer-brand h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.footer-brand p {
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 4rem;
}

.link-group h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.link-group a {
  display: block;
  text-decoration: none;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.link-group a:hover {
  color: var(--primary);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 2rem;
  text-align: center;
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Mobile Responsive */
@media (max-width: 900px) {
  .hero .container {
    flex-direction: column;
    text-align: center;
  }

  .hero-content h1 {
    font-size: 2.5rem;
  }

  .subtitle {
    margin: 0 auto 2.5rem;
  }

  .hero-image {
    width: 100%;
  }

  .footer-top {
    flex-direction: column;
    gap: 3rem;
  }
}