:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f6f7fb;
  --color-text: #1a1d29;
  --color-text-muted: #5b6072;
  --color-primary: #1b2a4a;
  --color-primary-dark: #121d33;
  --color-accent: #2dd4bf;
  --color-border: #e4e6ee;
  --radius: 14px;
  --max-width: 1080px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #11131a;
    --color-bg-alt: #171a23;
    --color-text: #f1f2f6;
    --color-text-muted: #a4a8b8;
    --color-primary: #2dd4bf;
    --color-primary-dark: #22b8a4;
    --color-border: #2a2e3b;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --color-bg: #11131a;
  --color-bg-alt: #171a23;
  --color-text: #f1f2f6;
  --color-text-muted: #a4a8b8;
  --color-primary: #2dd4bf;
  --color-primary-dark: #22b8a4;
  --color-border: #2a2e3b;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Vazirmatn", Tahoma, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
}

img { max-width: 100%; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: 0.5px;
}

.main-nav {
  display: flex;
  gap: 28px;
}

.main-nav a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}

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

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

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

/* Hero */
.hero {
  padding: 100px 0 80px;
  background: linear-gradient(180deg, var(--color-bg-alt), var(--color-bg));
  text-align: center;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  margin: 0 0 20px;
  color: var(--color-primary);
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 640px;
  margin: 0 auto 36px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.15s, opacity 0.15s;
}

.btn:hover { transform: translateY(-2px); }

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

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

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-border);
}

.btn-block {
  display: block;
  text-align: center;
  width: 100%;
}

/* Sections */
.section {
  padding: 80px 0;
}

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

.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin: 0 0 16px;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  margin: 0 0 48px;
}

/* About grid */
.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.about-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
}

.about-card h3 {
  margin: 0 0 12px;
  color: var(--color-primary);
}

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

/* Curriculum */
.curriculum-list {
  list-style: none;
  padding: 0;
  margin: 48px 0 0;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.curriculum-list li {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
}

.curriculum-num {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-accent);
  min-width: 48px;
}

.curriculum-list h3 {
  margin: 0 0 8px;
}

.curriculum-list p {
  margin: 0;
  color: var(--color-text-muted);
}

/* Pricing */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.pricing-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 36px;
  text-align: center;
}

.pricing-flag {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.pricing-amount {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.pricing-desc {
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

/* Instructor */
.instructor-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 40px;
  align-items: center;
}

.instructor-photo {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
}

.social-links a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
}

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

/* Responsive */
@media (max-width: 760px) {
  .main-nav { display: none; }
  .nav-toggle { display: flex; }

  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    right: 0;
    left: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 24px;
    gap: 16px;
  }

  .about-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .instructor-grid { grid-template-columns: 1fr; text-align: center; justify-items: center; }
}