@import url('https://fonts.googleapis.com/css2?family=Vazirmatn:wght@400;500;600;700;800&family=Lexend:wght@500;600;700&display=swap');

/* ============ Design Tokens (from ui-ux-pro-max design system: Trust & Authority) ============ */
:root {
  --color-primary: #0F172A;
  --color-on-primary: #FFFFFF;
  --color-secondary: #334155;
  --color-accent: #0369A1;
  --color-accent-hover: #075985;
  --color-background: #F8FAFC;
  --color-foreground: #020617;
  --color-muted: #E8ECF1;
  --color-muted-foreground: #64748B;
  --color-border: #E2E8F0;
  --color-destructive: #DC2626;
  --color-ring: #0F172A;
  --color-surface: #FFFFFF;

  --font-body: 'Vazirmatn', 'Segoe UI', Tahoma, sans-serif;
  --font-number: 'Lexend', 'Vazirmatn', sans-serif;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 96px;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  --shadow-sm: 0 1px 2px rgba(2, 6, 23, 0.06);
  --shadow-md: 0 8px 24px rgba(2, 6, 23, 0.08);
  --shadow-lg: 0 20px 48px rgba(2, 6, 23, 0.14);

  --container-w: 1180px;
  --transition: 200ms ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #0B1220;
    --color-surface: #111C30;
    --color-foreground: #F1F5F9;
    --color-muted: #1B2740;
    --color-muted-foreground: #94A3B8;
    --color-border: #22304A;
    --color-on-primary: #F8FAFC;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--color-background);
  color: var(--color-foreground);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding-inline: var(--space-4);
}

/* Focus states — accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-ring);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

.num { font-family: var(--font-number); font-variant-numeric: tabular-nums; }

/* ============ Header ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 250, 252, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}
@media (prefers-color-scheme: dark) {
  .site-header { background: rgba(11, 18, 32, 0.85); }
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-4);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--color-primary);
}
@media (prefers-color-scheme: dark) { .brand { color: var(--color-on-primary); } }

.brand .mark {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-number);
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.main-nav a {
  font-weight: 500;
  color: var(--color-secondary);
  padding: var(--space-2) 0;
  transition: color var(--transition);
}
@media (prefers-color-scheme: dark) { .main-nav a { color: var(--color-muted-foreground); } }
.main-nav a:hover, .main-nav a[aria-current="page"] { color: var(--color-accent); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--color-foreground);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: var(--color-secondary);
  transition: border-color var(--transition), color var(--transition);
  flex-shrink: 0;
}
.lang-switch:hover { border-color: var(--color-accent); color: var(--color-accent); }
@media (prefers-color-scheme: dark) { .lang-switch { color: var(--color-muted-foreground); } }

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 48px;
  padding: 0 var(--space-4);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.98rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
  white-space: nowrap;
}
.btn:active { transform: scale(0.97); }

.btn-accent {
  background: var(--color-accent);
  color: #fff;
}
.btn-accent:hover { background: var(--color-accent-hover); }

.btn-outline {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-primary);
}
@media (prefers-color-scheme: dark) { .btn-outline { color: var(--color-on-primary); } }
.btn-outline:hover { border-color: var(--color-accent); color: var(--color-accent); }

.btn-block { width: 100%; }

/* ============ Hero ============ */
.hero {
  position: relative;
  overflow: hidden;
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.hero-bg {
  position: absolute;
  inset: 0;
  opacity: 0.28;
}
.hero-bg img { width: 100%; height: 100%; object-fit: cover; }
.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(15,23,42,0.55) 0%, rgba(15,23,42,0.92) 100%);
}

.hero-inner {
  position: relative;
  padding: var(--space-8) var(--space-4) var(--space-7);
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.18);
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
  font-size: 0.85rem;
  margin-bottom: var(--space-4);
  color: #CBD5E1;
}

.hero h1 {
  font-size: clamp(1.9rem, 4.5vw, 3.1rem);
  font-weight: 800;
  line-height: 1.35;
  margin: 0 0 var(--space-4);
}

.hero p {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: #CBD5E1;
  margin: 0 0 var(--space-5);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
}

.stat-row {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-7);
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255,255,255,0.15);
}

.stat-item { text-align: center; }
.stat-item .stat-num {
  font-family: var(--font-number);
  font-weight: 700;
  font-size: clamp(1.4rem, 3vw, 2rem);
  display: block;
  color: #fff;
}
.stat-item .stat-label {
  font-size: 0.85rem;
  color: #94A3B8;
}

/* ============ Sections ============ */
section { padding: var(--space-8) 0; }

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-6);
}
.section-head .eyebrow { background: var(--color-muted); border-color: var(--color-border); color: var(--color-accent); }
.section-head h2 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--color-primary);
  margin: 0 0 var(--space-3);
}
@media (prefers-color-scheme: dark) { .section-head h2 { color: var(--color-on-primary); } }
.section-head p { color: var(--color-muted-foreground); margin: 0; }

/* Grade cards */
.grade-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
}
.grade-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.grade-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--color-accent); }
.grade-card { position: relative; }
.grade-card.is-popular { border-color: var(--color-accent); box-shadow: 0 0 0 1px var(--color-accent); }
.grade-badge {
  position: absolute;
  top: -12px;
  inset-inline-end: var(--space-3);
  background: var(--color-accent);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
  white-space: nowrap;
}
.grade-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--color-muted);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-2);
}
.grade-card .grade-num {
  font-family: var(--font-number);
  font-weight: 800;
  font-size: 1.75rem;
  color: var(--color-foreground);
  display: block;
}
.grade-card .grade-label {
  font-size: 0.85rem;
  color: var(--color-muted-foreground);
  margin-top: var(--space-1);
}

/* Spec table */
.spec-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-6);
}
.spec-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}
.spec-card h3 {
  font-size: 1rem;
  margin: 0 0 var(--space-3);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
@media (prefers-color-scheme: dark) { .spec-card h3 { color: var(--color-on-primary); } }
.spec-card ul { margin: 0; padding: 0; list-style: none; }
.spec-card li {
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-secondary);
  font-family: var(--font-number);
  font-size: 0.95rem;
}
@media (prefers-color-scheme: dark) { .spec-card li { color: var(--color-muted-foreground); } }
.spec-card li:last-child { border-bottom: none; }

/* Gallery */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
}
.gallery-item {
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}
.gallery-item img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 400ms ease;
}
.gallery-item:hover img { transform: scale(1.06); }

/* Feature cards */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}
.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
}
.feature-card .icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-sm);
  background: var(--color-muted);
  color: var(--color-accent);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: var(--space-3);
}
.feature-card h3 { margin: 0 0 var(--space-2); font-size: 1.05rem; color: var(--color-primary); }
@media (prefers-color-scheme: dark) { .feature-card h3 { color: var(--color-on-primary); } }
.feature-card p { margin: 0; color: var(--color-muted-foreground); font-size: 0.95rem; }

/* CTA band */
.cta-band {
  background: var(--color-primary);
  color: var(--color-on-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-6) var(--space-5);
  text-align: center;
  margin: 0 var(--space-4);
}
.cta-band h2 { font-size: clamp(1.3rem, 2.5vw, 1.8rem); margin: 0 0 var(--space-2); }
.cta-band p { color: #CBD5E1; margin: 0 0 var(--space-4); }

/* ============ About page ============ */
.page-banner {
  position: relative;
  padding: var(--space-7) 0 var(--space-6);
  background: var(--color-primary);
  color: var(--color-on-primary);
  text-align: center;
}
.page-banner h1 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); margin: 0; }
.page-banner p { color: #94A3B8; margin: var(--space-2) 0 0; }

.prose {
  max-width: 760px;
  margin: 0 auto;
}
.prose h2 {
  color: var(--color-primary);
  font-size: 1.3rem;
  margin: var(--space-6) 0 var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
@media (prefers-color-scheme: dark) { .prose h2 { color: var(--color-on-primary); } }
.prose h2:first-child { margin-top: 0; }
.prose p { color: var(--color-secondary); margin: 0 0 var(--space-3); }
@media (prefers-color-scheme: dark) { .prose p { color: var(--color-muted-foreground); } }

.about-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
  margin-top: var(--space-4);
}
.meta-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.18);
  padding: var(--space-2) var(--space-3);
  border-radius: 999px;
  font-size: 0.85rem;
}

/* ============ Contact page ============ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  align-items: stretch;
}
.contact-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}
.contact-row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
}
.contact-row:last-child { border-bottom: none; }
.contact-row .icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  background: var(--color-muted);
  color: var(--color-accent);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.contact-row h3 { margin: 0 0 var(--space-1); font-size: 0.95rem; color: var(--color-muted-foreground); font-weight: 500; }
.contact-row .value { font-weight: 700; font-size: 1.05rem; color: var(--color-primary); }
@media (prefers-color-scheme: dark) { .contact-row .value { color: var(--color-on-primary); } }
.contact-row .value.num { direction: ltr; display: inline-block; }

.map-wrap {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  min-height: 340px;
}
.map-wrap iframe { width: 100%; height: 100%; min-height: 340px; border: 0; }

/* ============ Footer ============ */
.site-footer {
  background: var(--color-primary);
  color: #94A3B8;
  padding: var(--space-6) 0 var(--space-4);
  margin-top: var(--space-8);
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: var(--space-5);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-inner h4 { color: #fff; font-size: 0.95rem; margin: 0 0 var(--space-3); }
.footer-inner ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: var(--space-2); }
.footer-inner a { transition: color var(--transition); }
.footer-inner a:hover { color: #fff; }
.footer-bottom {
  padding-top: var(--space-4);
  text-align: center;
  font-size: 0.85rem;
}

/* ============ Mobile ============ */
@media (max-width: 860px) {
  .container { padding-inline: 16px; }
  .main-nav { display: none; }
  .nav-toggle { display: inline-flex; }
  .stat-row { grid-template-columns: repeat(2, 1fr); }
  .grade-grid { grid-template-columns: repeat(2, 1fr); }
  .spec-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .cta-band { margin: 0; padding: var(--space-5) var(--space-4); border-radius: var(--radius-md); }

  .header-cta { gap: var(--space-1); }
  .header-cta .btn-accent {
    width: 44px;
    min-height: 44px;
    padding: 0;
  }
  .header-cta .btn-accent .num { display: none; }
  .lang-switch { min-width: 36px; height: 44px; padding: 0 8px; }
  .nav-toggle { width: 44px; height: 44px; }

  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    inset-inline: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-3) var(--space-4) var(--space-4);
    gap: var(--space-1);
  }
}