:root {
  --bg: #f7f6f3;
  --accent: #4a6fa5;
  --accent-hover: #3b5d8a;
  --text: #2c3e50;
  --text-light: #5a6c7d;
  --border: #ddd9d1;
  --card-bg: #ffffff;
  --shadow: rgba(0, 0, 0, 0.06);
  --shadow-hover: rgba(0, 0, 0, 0.12);
  --radius: 12px;
}

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

html {
  scroll-behavior: smooth;
}

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

/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(247, 246, 243, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

nav a {
  color: var(--text-light);
  text-decoration: none;
  font-size: 0.9rem;
  margin-left: 24px;
  transition: color 0.2s;
}

nav a:hover {
  color: var(--accent);
}

nav .nav-cta {
  background: var(--accent);
  color: #fff;
  padding: 8px 20px;
  border-radius: 8px;
  transition: background 0.2s;
}

nav .nav-cta:hover {
  background: var(--accent-hover);
  color: #fff;
}

/* Hero */
.hero {
  padding: 140px 24px 80px;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 2.8rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-light);
  margin-bottom: 36px;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

/* Buttons */
.cta-button {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 14px 32px;
  border-radius: 10px;
  text-decoration: none;
  font-size: 1rem;
  font-weight: 600;
  transition: background 0.2s, transform 0.15s;
  box-shadow: 0 2px 8px var(--shadow);
}

.cta-button:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.secondary-link {
  display: inline-block;
  margin-left: 20px;
  color: var(--text-light);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s;
}

.secondary-link:hover {
  color: var(--accent);
}

/* Features */
.features {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.features h2 {
  text-align: center;
  font-size: 1.8rem;
  margin-bottom: 40px;
  letter-spacing: -0.02em;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: box-shadow 0.2s, transform 0.15s;
}

.feature-card:hover {
  box-shadow: 0 4px 16px var(--shadow-hover);
  transform: translateY(-2px);
}

.feature-card h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--text-light);
  font-size: 0.92rem;
}

/* Download Section */
.download {
  text-align: center;
  padding: 60px 24px 80px;
  max-width: 600px;
  margin: 0 auto;
}

.download h2 {
  font-size: 1.8rem;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.download p {
  color: var(--text-light);
  margin-bottom: 28px;
}

.app-store-badge {
  height: 54px;
  transition: opacity 0.2s;
}

.app-store-badge:hover {
  opacity: 0.85;
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 24px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-light);
}

footer a {
  color: var(--text-light);
  text-decoration: none;
  margin: 0 12px;
  transition: color 0.2s;
}

footer a:hover {
  color: var(--accent);
}

/* Privacy Page */
.privacy-page {
  max-width: 800px;
  margin: 0 auto;
  padding: 120px 24px 80px;
}

.privacy-page .back-link {
  display: inline-block;
  color: var(--accent);
  text-decoration: none;
  margin-bottom: 32px;
  font-size: 0.9rem;
}

.privacy-page .back-link:hover {
  text-decoration: underline;
}

.privacy-page h1 {
  font-size: 2rem;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.privacy-page .last-updated {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: 32px;
}

.privacy-page h2 {
  font-size: 1.25rem;
  margin-top: 32px;
  margin-bottom: 12px;
}

.privacy-page p,
.privacy-page ul {
  color: var(--text-light);
  margin-bottom: 16px;
  font-size: 0.95rem;
}

.privacy-page ul {
  padding-left: 24px;
}

.privacy-page li {
  margin-bottom: 6px;
}

.privacy-page a {
  color: var(--accent);
}

/* Error Page */
.error-page {
  text-align: center;
  padding: 160px 24px 80px;
}

.error-page h1 {
  font-size: 4rem;
  color: var(--border);
  margin-bottom: 12px;
}

.error-page p {
  color: var(--text-light);
  margin-bottom: 28px;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .features h2,
  .download h2 {
    font-size: 1.5rem;
  }

  .secondary-link {
    display: block;
    margin: 16px 0 0;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 120px 16px 60px;
  }

  header {
    padding: 14px 16px;
  }

  nav a {
    margin-left: 16px;
    font-size: 0.85rem;
  }
}