:root {
  --bg-color: #f8fafc;
  --surface-color: #ffffff;
  --surface-hover: #f1f5f9;
  --border-color: #e2e8f0;
  --border-subtle: #cbd5e1;
  --text-main: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --primary-border: #bfdbfe;
  --accent-green: #10b981;
  --accent-green-bg: #ecfdf5;
  --accent-amber: #f59e0b;
  --accent-amber-bg: #fffbeb;
  --accent-red: #ef4444;
  --accent-red-bg: #fef2f2;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.07);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.08);
  --max-width: 900px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #0b0f19;
    --surface-color: #131b2e;
    --surface-hover: #1a243c;
    --border-color: #24304f;
    --border-subtle: #334166;
    --text-main: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --primary: #3b82f6;
    --primary-hover: #60a5fa;
    --primary-light: #172554;
    --primary-border: #1e3a8a;
    --accent-green-bg: #064e3b;
    --accent-amber-bg: #451a03;
    --accent-red-bg: #450a0a;
  }
}

* {
  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-main);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  background-color: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(8px);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.15rem;
}

.brand:hover {
  text-decoration: none;
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  background-color: var(--primary-light);
  text-decoration: none;
}

/* Hero Section */
.hero {
  padding: 56px 0 40px;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background-color: var(--primary-light);
  border: 1px solid var(--primary-border);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 16px;
  line-height: 1.25;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 32px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  text-decoration: none;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

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

.btn-primary:hover {
  background-color: var(--primary-hover);
  color: #ffffff;
}

.btn-outline {
  background-color: var(--surface-color);
  border-color: var(--border-color);
  color: var(--text-main);
}

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

.btn-danger {
  background-color: var(--accent-red);
  color: #ffffff;
}

.btn-danger:hover {
  background-color: #dc2626;
  color: #ffffff;
}

/* Feature Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin: 40px 0;
}

.feature-card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease;
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
}

.feature-icon {
  font-size: 1.8rem;
  margin-bottom: 12px;
  display: inline-block;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

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

/* Content Pages (Legal, Support, Privacy) */
.page-header {
  padding: 40px 0 24px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 32px;
}

.page-header h1 {
  font-size: 2.1rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.page-meta {
  color: var(--text-muted);
  font-size: 0.9rem;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.prose {
  color: var(--text-main);
}

.prose h2 {
  font-size: 1.45rem;
  font-weight: 700;
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.prose h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 24px 0 12px;
}

.prose p {
  margin-bottom: 16px;
  color: var(--text-secondary);
}

.prose ul, .prose ol {
  margin: 12px 0 20px 24px;
  color: var(--text-secondary);
}

.prose li {
  margin-bottom: 8px;
}

.prose strong {
  color: var(--text-main);
}

/* Tables */
.table-wrapper {
  overflow-x: auto;
  margin: 20px 0 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--surface-color);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

th {
  background-color: var(--surface-hover);
  padding: 12px 16px;
  font-weight: 600;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-color);
}

td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

tr:last-child td {
  border-bottom: none;
}

/* Alerts / Callouts */
.callout {
  padding: 16px 20px;
  border-radius: var(--radius-md);
  margin: 24px 0;
  border-left: 4px solid;
}

.callout-info {
  background-color: var(--primary-light);
  border-color: var(--primary);
  color: var(--text-main);
}

.callout-warning {
  background-color: var(--accent-amber-bg);
  border-color: var(--accent-amber);
  color: var(--text-main);
}

.callout-danger {
  background-color: var(--accent-red-bg);
  border-color: var(--accent-red);
  color: var(--text-main);
}

.callout-title {
  font-weight: 700;
  margin-bottom: 6px;
}

/* Step list */
.step-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 24px 0;
}

.step-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px;
}

.step-num {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background-color: var(--primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  flex-shrink: 0;
}

.step-content h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.step-content p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Footer */
.site-footer {
  margin-top: 64px;
  border-top: 1px solid var(--border-color);
  background-color: var(--surface-color);
  padding: 40px 0;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.footer-links {
  display: flex;
  gap: 20px;
  list-style: none;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

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

@media (max-width: 640px) {
  .hero h1 {
    font-size: 1.9rem;
  }
  .header-content {
    flex-direction: column;
    height: auto;
    padding: 14px 0;
    gap: 12px;
  }
  .nav-links {
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
  }
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
  .footer-links {
    justify-content: center;
  }
}