/* Common Styles */
:root {
  --primary-color: #24A1DE;
  --secondary-color: #f4f4f4;
  --text-dark: #333;
  --text-light: #fff;
  --bg-color: #fff;
  --footer-bg: #f9f9f9;
}

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

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

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

ul {
  list-style: none;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header & Nav */
header {
  background: var(--bg-color);
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  font-weight: 700;
  font-size: 20px;
  color: var(--primary-color);
}

.logo svg {
  margin-right: 8px;
}

.nav-links {
  display: flex;
  gap: 30px;
}

.nav-links a {
  color: #666;
  font-weight: 500;
  transition: color 0.3s;
}

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

/* Sections */
section {
  padding: 60px 0;
}

.hero {
  text-align: center;
  background: linear-gradient(135deg, #f0f7ff 0%, #ffffff 100%);
  padding: 100px 0;
}

.hero h1 {
  font-size: 42px;
  margin-bottom: 20px;
  color: #222;
}

.hero p {
  font-size: 18px;
  color: #666;
  max-width: 600px;
  margin: 0 auto 30px;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 30px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  border: none;
  font-size: 16px;
}

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

.btn-primary:hover {
  background-color: #1a8cc4;
  transform: translateY(-2px);
}

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}

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

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.feature-card {
  padding: 30px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.03);
  text-align: center;
}

.feature-card svg {
  width: 48px;
  height: 48px;
  color: var(--primary-color);
  margin-bottom: 15px;
}

.feature-card h3 {
  margin-bottom: 12px;
}

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 40px auto 0;
}

.faq-item {
  margin-bottom: 20px;
  border-bottom: 1px solid #eee;
  padding-bottom: 15px;
}

.faq-item h4 {
  margin-bottom: 8px;
  color: #222;
}

/* Download Platforms */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.platform-card {
  background: #f8fbff;
  border: 1px solid #e1e9f5;
  border-radius: 12px;
  padding: 25px;
  text-align: center;
}

.platform-card h3 {
  margin: 15px 0;
}

/* Footer */
footer {
  background-color: var(--footer-bg);
  padding: 40px 0;
  text-align: center;
  border-top: 1px solid #eee;
  font-size: 14px;
  color: #888;
}

.footer-info {
  margin-bottom: 10px;
  color: #555;
}

/* Animations */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 32px; }
  .nav-links { gap: 15px; }
  .features-grid { grid-template-columns: 1fr; }
}