:root {
  --primary-color: #1A2B3C;
  --primary-hover: #2E435D;
  --accent-color: #2563EB;
  --accent-light: #EFF6FF;
  --bg-color: #F8FAFC;
  --card-bg: #FFFFFF;
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --border-color: #E2E8F0;
  --badge-bg: #E0E7FF;
  --badge-text: #3730A3;
  --table-header-bg: #F1F5F9;
  --success-color: #10B981;
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary-color: #38BDF8;
    --primary-hover: #7DD3FC;
    --accent-color: #3B82F6;
    --accent-light: #1E293B;
    --bg-color: #0F172A;
    --card-bg: #1E293B;
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --border-color: #334155;
    --badge-bg: #312E81;
    --badge-text: #C7D2FE;
    --table-header-bg: #1E293B;
    --success-color: #34D399;
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  padding: 0;
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
}

.brand-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, #1A2B3C, #2563EB);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: bold;
  font-size: 1.1rem;
}

header h1 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
}

.nav-container {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
  font-size: 0.95rem;
}

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

.lang-switcher {
  display: flex;
  align-items: center;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2px;
}

.lang-btn {
  border: none;
  background: transparent;
  padding: 4px 12px;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 16px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.lang-btn.active {
  background: var(--accent-color);
  color: #FFFFFF;
}

.container {
  max-width: 960px;
  margin: 2rem auto;
  padding: 0 1.5rem;
  flex: 1;
}

.card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 2.5rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border-color);
  margin-bottom: 2.5rem;
}

.hero {
  text-align: center;
  padding: 4rem 2rem;
  background: linear-gradient(180deg, var(--card-bg) 0%, var(--accent-light) 100%);
  border-radius: 20px;
  margin-bottom: 2.5rem;
  border: 1px solid var(--border-color);
}

.hero-badge {
  display: inline-block;
  background: var(--badge-bg);
  color: var(--badge-text);
  padding: 0.35rem 1rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.hero h2 {
  font-size: 2.5rem;
  line-height: 1.25;
  margin-bottom: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--accent-color);
  color: #ffffff;
  padding: 0.85rem 1.75rem;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: transform 0.2s ease, background-color 0.2s ease;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  background-color: #1D4ED8;
  transform: translateY(-2px);
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
  text-align: center;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.feature-card {
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-color);
}

.feature-icon {
  width: 44px;
  height: 44px;
  background: var(--badge-bg);
  color: var(--accent-color);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Tier Comparison Table */
.pricing-table-wrapper {
  overflow-x: auto;
  margin-top: 1.5rem;
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.pricing-table th, .pricing-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.pricing-table th {
  background-color: var(--table-header-bg);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.pricing-table td {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.pricing-table tr:hover td {
  background-color: var(--accent-light);
}

.check-icon {
  color: var(--success-color);
  font-weight: bold;
}

.cross-icon {
  color: #EF4444;
  font-weight: bold;
}

.policy-badge {
  display: inline-block;
  background-color: var(--badge-bg);
  color: var(--badge-text);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
}

.privacy-article h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.privacy-article h3 {
  font-size: 1.25rem;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.4rem;
}

.privacy-article p, .privacy-article li {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.privacy-article ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.callout-box {
  background: var(--accent-light);
  border-left: 4px solid var(--accent-color);
  padding: 1.25rem;
  border-radius: 8px;
  margin: 1.5rem 0;
}

.callout-box p {
  margin: 0;
  color: var(--text-primary);
  font-weight: 500;
}

footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--card-bg);
  margin-top: auto;
}

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

footer a:hover {
  text-decoration: underline;
}

@media (max-width: 640px) {
  header {
    padding: 1rem;
    flex-direction: column;
    gap: 1rem;
  }

  .hero {
    padding: 2.5rem 1rem;
  }

  .hero h2 {
    font-size: 1.75rem;
  }

  .card {
    padding: 1.5rem;
  }
}