:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-text: #1f2937;
  --color-muted: #6b7280;
  --color-bg: #f9fafb;
  --color-card: #ffffff;
  --color-border: #e5e7eb;
  --radius: 12px;
  --max-width: 860px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

body.rtl { direction: rtl; text-align: right; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  max-width: var(--max-width);
}
.brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-primary);
  text-decoration: none;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}
.main-nav a {
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.95rem;
}
.main-nav a:hover { color: var(--color-primary); }

.lang-switch { position: relative; }
.lang-switch-btn {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 0.9rem;
}
.lang-switch-menu {
  display: none;
  position: absolute;
  right: 0;
  top: 110%;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  list-style: none;
  margin: 0;
  padding: 6px;
  min-width: 160px;
  max-height: 320px;
  overflow-y: auto;
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}
body.rtl .lang-switch-menu { right: auto; left: 0; }
.lang-switch-menu.open { display: block; }
.lang-switch-menu a {
  display: block;
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 0.9rem;
  color: var(--color-text);
  text-decoration: none;
}
.lang-switch-menu a:hover, .lang-switch-menu a.active {
  background: var(--color-bg);
  color: var(--color-primary);
}
.mobile-nav-toggle { display: none; background: none; border: none; font-size: 1.4rem; cursor: pointer; }

/* Hero */
.hero {
  text-align: center;
  padding: 40px 20px 10px;
}
.hero h1 { font-size: 2rem; margin-bottom: 8px; }
.hero .subtitle { color: var(--color-muted); font-size: 1.05rem; }

/* Calculator */
.calculator-wrap { padding: 20px 20px 10px; }
.calculator-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.04);
}
#ageForm { display: flex; flex-wrap: wrap; gap: 14px; align-items: flex-end; }
#ageForm label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 0.9rem; }
#ageForm input[type="date"] {
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 1rem;
  min-width: 220px;
  flex: 1;
}
#calcBtn, .save-btn {
  background: var(--color-primary);
  color: #fff;
  border: none;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  font-weight: 600;
}
#calcBtn:hover, .save-btn:hover { background: var(--color-primary-dark); }
.secondary-btn {
  background: transparent;
  border: 1px solid var(--color-border);
  padding: 10px 18px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  margin-top: 16px;
}
.error-msg { color: #b91c1c; margin-top: 12px; font-size: 0.9rem; }

.result-box { margin-top: 28px; border-top: 1px solid var(--color-border); padding-top: 24px; }
.result-box h2 { margin-top: 0; font-size: 1.2rem; }
.result-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 16px 0;
}
.result-cell {
  background: var(--color-bg);
  border-radius: 10px;
  padding: 18px 10px;
  text-align: center;
}
.result-num { display: block; font-size: 2rem; font-weight: 700; color: var(--color-primary); }
.result-label { font-size: 0.85rem; color: var(--color-muted); }
.fun-facts { list-style: none; padding: 0; margin: 16px 0 0; font-size: 0.95rem; }
.fun-facts li { padding: 6px 0; border-bottom: 1px dashed var(--color-border); }
.fun-facts li:last-child { border-bottom: none; }

/* Content sections */
.content-block { padding: 30px 20px; }
.content-block h2 { font-size: 1.4rem; }
.content-block p { color: #374151; }

.faq-section { padding: 10px 20px 50px; }
.faq-heading { font-size: 1.4rem; margin-bottom: 16px; }
.faq-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 14px 18px;
  margin-bottom: 10px;
}
.faq-item summary { cursor: pointer; font-weight: 600; }
.faq-item p { margin-bottom: 0; margin-top: 10px; color: #374151; }

.static-page h1 { font-size: 1.8rem; }
.contact-email { font-size: 1.05rem; margin-top: 20px; }
.contact-email a { color: var(--color-primary); }

/* Ad slots */
.ad-slot {
  max-width: var(--max-width);
  margin: 10px auto;
  padding: 10px 20px;
  text-align: center;
}
.ad-label {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-muted);
  margin-bottom: 6px;
}

/* Footer */
.site-footer {
  background: var(--color-card);
  border-top: 1px solid var(--color-border);
  padding: 30px 20px;
  margin-top: 30px;
}
.footer-inner { text-align: center; }
.footer-text { color: var(--color-muted); font-size: 0.9rem; margin-bottom: 14px; }
.footer-nav { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; margin-bottom: 14px; }
.footer-nav a { color: var(--color-text); text-decoration: none; font-size: 0.9rem; }
.footer-nav a:hover { color: var(--color-primary); }
.copyright { font-size: 0.8rem; color: var(--color-muted); }

/* Cookie banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: #111827;
  color: #f9fafb;
  padding: 16px 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px;
  font-size: 0.85rem;
  z-index: 100;
}
.cookie-banner a { color: #93c5fd; }
.cookie-banner button {
  background: var(--color-primary);
  color: #fff;
  border: none;
  padding: 8px 18px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  white-space: nowrap;
}

@media (max-width: 640px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 20px;
    gap: 14px;
  }
  .main-nav.open { display: flex; }
  .mobile-nav-toggle { display: block; }
  .lang-switch { width: 100%; }
  .lang-switch-menu { position: static; box-shadow: none; width: 100%; margin-top: 8px; }
  #ageForm { flex-direction: column; align-items: stretch; }
  .result-grid { grid-template-columns: 1fr; }
}