:root {
  --bg: #0f1220;
  --bg-alt: #171a2e;
  --bg-card: #1e2240;
  --text: #e8e6f0;
  --text-dim: #a6a3bd;
  --accent: #d4a94e;
  --accent-soft: #f2d38a;
  --accent-dark: #b08a34;
  --line: rgba(232, 230, 240, 0.12);
  --radius: 14px;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-ar: "Amiri", "Traditional Arabic", serif;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

[lang="ar"] {
  font-family: var(--font-ar);
  font-size: 1.15em;
}

.container {
  width: min(1120px, 92%);
  margin-inline: auto;
}

.accent {
  color: var(--accent);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #111;
  padding: 10px 16px;
  z-index: 100;
  border-radius: 0 0 8px 0;
  font-weight: 600;
}

.skip-link:focus {
  left: 0;
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  background: rgba(15, 18, 32, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  z-index: 50;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 16px;
}

.brand {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  text-decoration: none;
  color: var(--text);
}

.brand-ar {
  font-family: var(--font-ar);
  font-size: 1.5rem;
  color: var(--accent);
}

.brand-en {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  list-style: none;
}

.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

.lang-select {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  background-color: var(--bg-card);
  color: var(--accent-soft);
  border: 1px solid var(--accent-dark);
  border-radius: 999px;
  padding: 9px 32px 9px 16px;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path d='M0 0l5 6 5-6z' fill='%23d4a94e'/></svg>");
  background-repeat: no-repeat;
  background-position: right 12px center;
  transition: border-color 0.2s;
}

.lang-select:hover {
  border-color: var(--accent);
}

.lang-select option {
  background: var(--bg-card);
  color: var(--text);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle .bar {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 168px 0 96px;
  background:
    radial-gradient(900px 400px at 85% -10%, rgba(212, 169, 78, 0.16), transparent 60%),
    radial-gradient(700px 380px at 10% 10%, rgba(96, 120, 210, 0.14), transparent 60%);
  overflow: hidden;
}

.hero-inner {
  position: relative;
  z-index: 2;
  text-align: center;
}

.hero-kicker {
  color: var(--accent);
  font-size: 1.15rem;
  margin-bottom: 18px;
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 22px;
}

.hero-sub {
  max-width: 620px;
  margin-inline: auto;
  color: var(--text-dim);
  font-size: 1.08rem;
  margin-bottom: 34px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.btn {
  display: inline-block;
  padding: 13px 28px;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  font-size: 0.95rem;
  transition: transform 0.2s, background 0.2s, box-shadow 0.2s;
}

.btn-primary {
  background: var(--accent);
  color: #14161f;
}

.btn-primary:hover {
  background: var(--accent-soft);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(212, 169, 78, 0.3);
}

.btn-ghost {
  border: 1px solid var(--line);
  color: var(--text);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.hero-arabic {
  font-size: 1.7rem;
  color: var(--accent-soft);
  opacity: 0.85;
  line-height: 2.1;
  margin-inline: auto;
  max-width: 560px;
}

.hero-pattern {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(212, 169, 78, 0.14) 1px, transparent 1px);
  background-size: 26px 26px;
  opacity: 0.35;
  mask-image: linear-gradient(to bottom, black, transparent 70%);
  -webkit-mask-image: linear-gradient(to bottom, black, transparent 70%);
}

/* ---------- Stats ---------- */
.stats {
  border-block: 1px solid var(--line);
  background: var(--bg-alt);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 44px 0;
}

.stat {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-num {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--accent);
}

.stat-label {
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* ---------- Sections ---------- */
.section {
  padding: 96px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-head {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  color: var(--accent);
  font-size: 1.25rem;
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-intro {
  color: var(--text-dim);
  font-size: 1.02rem;
}

/* ---------- Timeline ---------- */
.timeline {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 6%;
  right: 6%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-dark), var(--accent), var(--accent-dark), transparent);
}

.tl-item {
  position: relative;
  padding-top: 52px;
}

.tl-item::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 0;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--accent);
}

.tl-year {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(212, 169, 78, 0.12);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.tl-item h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.tl-item p {
  color: var(--text-dim);
  font-size: 0.95rem;
}

/* ---------- Alphabet ---------- */
.letters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
  gap: 14px;
}

.letter {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 12px 14px;
  text-align: center;
  cursor: pointer;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
  user-select: none;
}

.letter:hover {
  transform: translateY(-3px);
  border-color: var(--accent-dark);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.35);
}

.letter.isolated {
  display: block;
  font-family: var(--font-ar);
  font-size: 2.1rem;
  color: var(--text);
  line-height: 1.3;
}

.letter-form {
  display: block;
  font-family: var(--font-ar);
  font-size: 1.05rem;
  color: var(--accent-soft);
  line-height: 1.8;
}

.letter-trans {
  display: block;
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-top: 2px;
  letter-spacing: 0.04em;
}

.letter.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(212, 169, 78, 0.25), 0 12px 24px rgba(0, 0, 0, 0.35);
}

.letter-detail {
  display: none;
}

.letter-detail.visible {
  display: block;
  grid-column: 1 / -1;
  background: var(--bg-card);
  border: 1px solid var(--accent-dark);
  border-radius: var(--radius);
  padding: 24px 28px;
  text-align: center;
}

.letter-detail .big {
  font-family: var(--font-ar);
  font-size: 3.4rem;
  color: var(--accent-soft);
  line-height: 1.2;
}

.letter-detail p {
  color: var(--text-dim);
  margin-top: 6px;
  font-size: 0.95rem;
}

/* ---------- Grammar cards ---------- */
.grammar-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: transform 0.25s, border-color 0.25s;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-dark);
}

.card-icon {
  font-size: 2rem;
  display: inline-block;
  margin-bottom: 16px;
}

.card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.card p {
  color: var(--text-dim);
  font-size: 0.94rem;
}

/* ---------- Dialects ---------- */
.dialect-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.dialect-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 26px;
  text-align: center;
  transition: transform 0.25s, border-color 0.25s;
}

.dialect-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-dark);
}

.dialect-card h3 {
  margin-bottom: 10px;
  color: var(--accent-soft);
}

.dialect-sample {
  font-size: 1.5rem;
  line-height: 1.8;
  margin-bottom: 14px;
}

.dialect-card span {
  color: var(--text-dim);
  font-size: 0.85rem;
}

/* ---------- Words ---------- */
.words-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.word {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 18px;
  text-align: center;
  transition: transform 0.25s, border-color 0.25s;
}

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

.word span {
  display: block;
  font-size: 1.8rem;
  line-height: 1.5;
  color: var(--accent-soft);
}

.word strong {
  display: block;
  font-size: 1.05rem;
  margin-top: 6px;
}

.word small {
  display: block;
  color: var(--text-dim);
  font-size: 0.8rem;
  margin-top: 4px;
}

/* ---------- Resources ---------- */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.resource {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 28px;
  text-decoration: none;
  color: var(--text);
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}

.resource:hover {
  transform: translateY(-5px);
  border-color: var(--accent);
  box-shadow: var(--shadow);
}

.resource-num {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.1em;
}

.resource h3 {
  margin: 8px 0 6px;
  font-size: 1.15rem;
}

.resource p {
  color: var(--text-dim);
  font-size: 0.92rem;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-alt);
  padding: 48px 0;
  text-align: center;
}

.footer-arabic {
  font-size: 1.6rem;
  color: var(--accent-soft);
  margin-bottom: 10px;
}

.site-footer p {
  color: var(--text-dim);
  margin-bottom: 8px;
}

.site-footer small {
  color: var(--text-dim);
  opacity: 0.7;
}

/* ---------- RTL mode ---------- */
html[dir="rtl"] body {
  font-family: var(--font-ar), var(--font-body);
}

html[dir="rtl"] [lang="en"],
html[dir="rtl"] .brand-en,
html[dir="rtl"] .hero-title,
html[dir="rtl"] .section-title,
html[dir="rtl"] .stat-label,
html[dir="rtl"] .card p,
html[dir="rtl"] .resource p,
html[dir="rtl"] .word small {
  font-family: var(--font-body);
}

html[dir="rtl"] .hero-title,
html[dir="rtl"] .section-title {
  line-height: 1.5;
}

html[dir="rtl"] .tl-item::before {
  left: auto;
  right: 0;
}

html[dir="rtl"] .lang-select {
  padding-right: 16px;
  padding-left: 32px;
  background-position: left 12px center;
}

html[dir="rtl"] .timeline::before {
  background: linear-gradient(90deg, transparent, var(--accent-dark), var(--accent), var(--accent-dark), transparent);
}

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  .timeline { grid-template-columns: repeat(2, 1fr); gap: 20px 24px; }
  .timeline::before { display: none; }
  .grammar-grid { grid-template-columns: repeat(2, 1fr); }
  .dialect-grid { grid-template-columns: repeat(2, 1fr); }
  .words-grid { grid-template-columns: repeat(3, 1fr); }

  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: 72px;
    right: 0;
    left: 0;
    flex-direction: column;
    gap: 4px;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--line);
    padding: 16px 24px 24px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s, transform 0.25s;
  }
  .nav-links.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: 12px 8px; font-size: 1rem; }
  .lang-select { width: 100%; }
}

@media (max-width: 640px) {
  .hero { padding: 140px 0 72px; }
  .stats-grid { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: 1fr; }
  .grammar-grid { grid-template-columns: 1fr; }
  .dialect-grid { grid-template-columns: 1fr; }
  .words-grid { grid-template-columns: repeat(2, 1fr); }
  .resources-grid { grid-template-columns: 1fr; }
  .hero-arabic { font-size: 1.3rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { transition-duration: 0.01ms !important; }
}