:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --text-main: #0f172a;
  --text-muted: #475569;
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  --warning-bg: #fffbeb;
  --warning-border: #fef3c7;
  --warning-text: #92400e;
  --danger-bg: #fef2f2;
  --danger-border: #fee2e2;
  --danger-text: #991b1b;
  --success-bg: #f0fdf4;
  --success-text: #166534;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --radius: 12px;
}

* {
  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-page);
  color: var(--text-main);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Nav */
header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 50;
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text-main);
  text-decoration: none;
}

.brand-badge {
  background: var(--primary);
  color: white;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 6px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

nav ul {
  display: flex;
  gap: 20px;
  list-style: none;
}

nav a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.15s ease;
}

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

/* Page Card / Content */
.content-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 40px;
  margin: 40px 0;
  box-shadow: var(--shadow-sm);
}

h1 {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}

h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 32px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 20px;
  margin-bottom: 8px;
}

p, ul, ol {
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: 1rem;
}

ul, ol {
  padding-left: 24px;
}

li {
  margin-bottom: 8px;
}

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

/* Callout Boxes */
.alert {
  padding: 18px 20px;
  border-radius: 8px;
  margin: 20px 0;
  font-size: 0.95rem;
}

.alert-warning {
  background: var(--warning-bg);
  border-left: 4px solid #f59e0b;
  color: var(--warning-text);
}

.alert-danger {
  background: var(--danger-bg);
  border-left: 4px solid #ef4444;
  color: var(--danger-text);
}

.alert-info {
  background: var(--primary-light);
  border-left: 4px solid var(--primary);
  color: #1e40af;
}

.alert h4 {
  font-weight: 700;
  margin-bottom: 6px;
  font-size: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

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

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

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

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

/* Meta timestamp */
.meta-date {
  font-size: 0.875rem;
  color: #64748b;
  margin-bottom: 24px;
}

/* Donation section */
.donation-card {
  background: #fdfaf0;
  border: 1px solid #fde68a;
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 36px;
  text-align: center;
}

.donation-card h3 {
  margin-top: 0;
  color: #92400e;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  background: var(--bg-card);
  padding: 32px 0;
  margin-top: 60px;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
}

footer .footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

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

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

@media (max-width: 640px) {
  .content-box {
    padding: 24px 16px;
  }
  .nav-wrap {
    flex-direction: column;
    height: auto;
    padding: 12px 0;
    gap: 12px;
  }
}