:root {
  --brand: #7C3AED;
  --brand-light: #A78BFA;
  --brand-dark: #6D28D9;
  --bg: #FAFAFC;
  --surface: #FFFFFF;
  --text: #1A1A2E;
  --text-muted: #5A5A78;
  --text-soft: #8B8BA8;
  --border: #ECECF4;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 10px 40px -10px rgba(124, 58, 237, 0.18);
  --shadow-soft: 0 2px 12px rgba(20, 20, 50, 0.05);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Inter', 'Tajawal', -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background:
    radial-gradient(circle at 0% 0%, rgba(124, 58, 237, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 100% 30%, rgba(167, 139, 250, 0.08) 0%, transparent 40%),
    var(--bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

[dir="rtl"] body,
[lang="ar"] body {
  font-family: 'Tajawal', 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
}

.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
}

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

.logo-mark {
  font-size: 28px;
  line-height: 1;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-en {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-light) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-ar {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

.site-nav {
  display: flex;
  gap: 6px;
}

.site-nav a {
  padding: 8px 14px;
  border-radius: 999px;
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 15px;
  transition: all 0.15s ease;
}

.site-nav a:hover {
  background: rgba(124, 58, 237, 0.08);
  color: var(--brand);
}

/* Main */
.site-main {
  padding: 48px 0 80px;
}

.content-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 56px 64px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

/* Typography */
.content-card h1 {
  font-size: 44px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  background: linear-gradient(135deg, var(--text) 0%, var(--brand) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.content-card h2 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 48px 0 16px;
  color: var(--text);
  scroll-margin-top: 80px;
}

.content-card h3 {
  font-size: 21px;
  font-weight: 700;
  margin: 36px 0 12px;
  color: var(--text);
}

.content-card h4 {
  font-size: 17px;
  font-weight: 700;
  margin: 28px 0 8px;
  color: var(--brand);
}

.content-card p {
  margin: 0 0 16px;
  color: var(--text-muted);
}

.content-card strong {
  color: var(--text);
  font-weight: 600;
}

.content-card a {
  color: var(--brand);
  text-decoration: none;
  border-bottom: 1px solid rgba(124, 58, 237, 0.3);
  transition: border-color 0.15s ease;
}

.content-card a:hover {
  border-bottom-color: var(--brand);
}

.content-card ul,
.content-card ol {
  margin: 0 0 16px;
  padding-inline-start: 24px;
  color: var(--text-muted);
}

.content-card li {
  margin-bottom: 6px;
}

.content-card hr {
  border: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin: 48px 0;
}

.content-card code {
  background: rgba(124, 58, 237, 0.08);
  padding: 2px 8px;
  border-radius: 6px;
  font-family: 'SF Mono', Menlo, Monaco, 'Courier New', monospace;
  font-size: 0.9em;
  color: var(--brand-dark);
}

.content-card blockquote {
  margin: 24px 0;
  padding: 16px 20px;
  border-inline-start: 3px solid var(--brand);
  background: rgba(124, 58, 237, 0.04);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
}

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

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--text);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
}

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

.footer-links .dot {
  color: var(--text-soft);
}

.footer-copy {
  color: var(--text-soft);
  font-size: 13px;
}

/* Responsive */
@media (max-width: 720px) {
  .site-nav a { padding: 6px 10px; font-size: 14px; }
  .content-card { padding: 32px 24px; border-radius: 14px; }
  .content-card h1 { font-size: 32px; }
  .content-card h2 { font-size: 23px; margin: 36px 0 12px; }
  .content-card h3 { font-size: 18px; }
  .site-main { padding: 24px 0 56px; }
  .logo-text { display: none; }
}

/* Bilingual content blocks (when EN and AR sit side-by-side in same doc) */
.content-card [dir="rtl"],
.content-card *[lang="ar"] {
  text-align: right;
}