:root {
  --primary-color: #007aff;
  --text-color: #1d1d1f;
  --secondary-text: #86868b;
  --bg-color: #ffffff;
  --card-bg: #f5f5f7;
  --nav-bg: rgba(255, 255, 255, 0.8);
  --border-color: #d2d2d7;
  --max-width: 980px;
}

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

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

a {
  color: var(--primary-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Navigation */
nav {
  position: sticky;
  top: 0;
  background: var(--nav-bg);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  height: 48px;
  display: flex;
  align-items: center;
}

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

.nav-logo {
  font-weight: 600;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--text-color);
}

.nav-links a {
  margin-left: 24px;
  font-size: 14px;
  color: var(--text-color);
  opacity: 0.8;
}

.nav-links a:hover {
  opacity: 1;
  text-decoration: none;
}

/* Hero Section */
.hero {
  padding: 80px 0;
  text-align: center;
}

.hero h1 {
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin-bottom: 12px;
}

.hero p {
  font-size: 24px;
  color: var(--secondary-text);
  max-width: 600px;
  margin: 0 auto;
}

/* App Card */
.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  padding: 40px 0;
}

.app-card {
  background: var(--card-bg);
  border-radius: 20px;
  padding: 40px;
  text-align: center;
  transition: transform 0.3s ease;
}

.app-card:hover {
  transform: scale(1.02);
}

.app-icon {
  width: 100px;
  height: 100px;
  border-radius: 22px;
  background: #fff;
  margin: 0 auto 24px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
}

.app-card h2 {
  font-size: 28px;
  margin-bottom: 12px;
}

.app-card p {
  color: var(--secondary-text);
  margin-bottom: 24px;
}

.btn {
  display: inline-block;
  background: var(--primary-color);
  color: #fff;
  padding: 12px 24px;
  border-radius: 980px;
  font-weight: 600;
  transition: opacity 0.2s;
}

.btn:hover {
  opacity: 0.8;
  text-decoration: none;
}

/* Content Page */
.content-page {
  padding: 60px 0 100px;
}

.content-page h1 {
  font-size: 40px;
  margin-bottom: 40px;
}

.content-block {
  margin-bottom: 40px;
}

.content-block h2 {
  font-size: 24px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
}

.content-block p, .content-block li {
  font-size: 17px;
  color: var(--text-color);
  margin-bottom: 16px;
}

.content-block ul {
  margin-left: 20px;
  margin-bottom: 16px;
}

/* Footer */
footer {
  padding: 40px 0;
  background: var(--card-bg);
  color: var(--secondary-text);
  font-size: 12px;
  margin-top: 80px;
}

.footer-links {
  margin-top: 20px;
}

.footer-links a {
  color: var(--secondary-text);
  margin-right: 20px;
}

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

@media (max-width: 768px) {
  .hero h1 { font-size: 40px; }
  .hero p { font-size: 20px; }
}