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

:root {
  --blue: #1a73e8;
  --dark: #0d1117;
  --gray: #6e7681;
  --light: #f6f8fa;
  --white: #ffffff;
}

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

/* Lang toggle */
.lang-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 100;
  display: flex;
  gap: 4px;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(8px);
  border: 1px solid #e1e4e8;
  border-radius: 8px;
  padding: 4px;
}
.lang-btn {
  padding: 6px 14px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  background: transparent;
  color: var(--gray);
  transition: all 0.2s;
}
.lang-btn.active {
  background: var(--blue);
  color: white;
}

/* Nav */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 40px;
  border-bottom: 1px solid #e1e4e8;
}
.logo {
  font-size: 22px;
  font-weight: 700;
  color: var(--dark);
  text-decoration: none;
  letter-spacing: -0.5px;
}
.logo span { color: var(--blue); }
nav ul {
  display: flex;
  gap: 32px;
  list-style: none;
}
nav ul a {
  color: var(--gray);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: color 0.2s;
}
nav ul a:hover { color: var(--dark); }

/* Hero */
.hero {
  text-align: center;
  padding: 100px 40px 80px;
  max-width: 760px;
  margin: 0 auto;
}
.badge {
  display: inline-block;
  background: #e8f0fe;
  color: var(--blue);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 28px;
}
.hero h1 {
  font-size: 52px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
  color: var(--dark);
}
.hero p {
  font-size: 20px;
  color: var(--gray);
  max-width: 560px;
  margin: 0 auto 40px;
}
.btn-primary {
  display: inline-block;
  background: var(--blue);
  color: white;
  padding: 14px 32px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  transition: opacity 0.2s;
}
.btn-primary:hover { opacity: 0.9; }

/* Shield icon */
.shield-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 40px;
}

/* Features */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 40px 100px;
}
.feature-card {
  background: var(--light);
  border-radius: 16px;
  padding: 32px 28px;
}
.feature-icon {
  font-size: 32px;
  margin-bottom: 16px;
}
.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}
.feature-card p {
  font-size: 15px;
  color: var(--gray);
}

/* Footer */
footer {
  border-top: 1px solid #e1e4e8;
  padding: 32px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
footer p { color: var(--gray); font-size: 14px; }
.footer-links { display: flex; gap: 24px; }
.footer-links a {
  color: var(--gray);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--dark); }

/* Inner pages */
.page-content {
  max-width: 760px;
  margin: 0 auto;
  padding: 60px 40px 100px;
}
.page-content h1 {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 8px;
}
.page-meta {
  color: var(--gray);
  font-size: 14px;
  margin-bottom: 48px;
}
.page-content h2 {
  font-size: 20px;
  font-weight: 700;
  margin: 40px 0 12px;
}
.page-content p, .page-content li {
  font-size: 16px;
  color: #333;
  margin-bottom: 12px;
}
.page-content ul {
  padding-left: 20px;
  margin-bottom: 12px;
}
.page-content a { color: var(--blue); }
.divider {
  border: none;
  border-top: 1px solid #e1e4e8;
  margin: 60px 0;
}

/* Support */
.contact-card {
  background: var(--light);
  border-radius: 16px;
  padding: 32px;
  margin-top: 40px;
}
.contact-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}
.contact-card a {
  color: var(--blue);
  font-size: 18px;
  font-weight: 600;
  text-decoration: none;
}

/* Lang sections */
[data-lang] { display: none; }
[data-lang].visible { display: block; }

@media (max-width: 768px) {
  .hero h1 { font-size: 36px; }
  .features { grid-template-columns: 1fr; }
  nav ul { display: none; }
  nav { padding: 16px 20px; }
  .hero { padding: 80px 20px 60px; }
  .features { padding: 0 20px 60px; }
  footer { padding: 24px 20px; flex-direction: column; align-items: flex-start; }
  .page-content { padding: 40px 20px 80px; }
}