* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Vazir', sans-serif;
    background: #F9FAFB;
    color: #111827;
    direction: rtl;
  }
  
  .container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 4vw;
  }
  
  /* هدر */
  .header {
    background: linear-gradient(to right, #10B981, #34D399);
    padding: 1.2rem 0;
    text-align: center;
  }
  
  .logo {
    font-size: clamp(1.6rem, 6vw, 2.2rem);
    font-weight: 700;
  }
  
  .logo a {
    color: #FFFFFF;
    text-decoration: none;
  }
  
  /* بنر */
  .hero {
    background: linear-gradient(to right, #FFFFFF, #E5E7EB);
    padding: clamp(2.5rem, 12vw, 5rem) 0;
    text-align: center;
  }
  
  .hero-title {
    font-size: clamp(2rem, 7vw, 3rem);
    color: #10B981;
    margin-bottom: 0.8rem;
  }
  
  .hero-text {
    font-size: clamp(1rem, 4vw, 1.3rem);
    color: #4B5563;
    margin-bottom: 1.8rem;
  }
  
  .btn {
    display: inline-block;
    padding: 0.9rem 2rem;
    background: #7C3AED;
    color: #FFFFFF;
    text-decoration: none;
    border-radius: 8px;
    font-size: clamp(0.9rem, 3.5vw, 1.1rem);
    font-weight: 700;
    transition: background 0.3s, transform 0.3s;
  }
  
  .btn:hover {
    background: #6D28D9;
    transform: rotate(2deg);
  }
  
  /* درس‌ها */
  .lessons, .lesson-content {
    padding: clamp(2rem, 10vw, 4rem) 0;
  }
  
  .section-title {
    font-size: clamp(1.6rem, 5.5vw, 2rem);
    color: #10B981;
    text-align: center;
    margin-bottom: 2.5rem;
  }
  
  .lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(220px, 100%), 1fr));
    gap: 2rem;
  }
  
  .lesson-card {
    background: #FFFFFF;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    border: 2px solid #E5E7EB;
    transition: border-color 0.3s, transform 0.3s;
  }
  
  .lesson-card:hover {
    border-color: #7C3AED;
    transform: rotate(1deg);
  }
  
  .lesson-card h3 {
    font-size: clamp(1.2rem, 4.5vw, 1.5rem);
    color: #10B981;
    margin-bottom: 0.6rem;
  }
  
  .lesson-card p {
    font-size: clamp(0.9rem, 3.5vw, 1rem);
    color: #6B7280;
    margin-bottom: 1rem;
  }
  
  .lesson-btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    background: #10B981;
    color: #FFFFFF;
    text-decoration: none;
    border-radius: 6px;
    font-size: clamp(0.8rem, 3vw, 0.95rem);
    transition: background 0.3s;
  }
  
  .lesson-btn:hover {
    background: #059669;
  }
  
  /* محتوای درس */
  .lesson-text {
    background: #FFFFFF;
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid #E5E7EB;
    margin-bottom: 2rem;
  }
  
  .lesson-text h3 {
    font-size: clamp(1.2rem, 4.5vw, 1.5rem);
    color: #111827;
    margin: 1rem 0 0.5rem;
  }
  
  .lesson-text p, .lesson-text ul {
    font-size: clamp(0.9rem, 3.5vw, 1rem);
    color: #6B7280;
    margin-bottom: 1rem;
  }
  
  .lesson-text ul {
    padding-right: 1.5rem;
  }
  
  .lesson-text li {
    margin-bottom: 0.5rem;
  }
  
  .code-block {
    background: #F3F4F6;
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem 0;
    overflow-x: auto;
    direction: ltr;
  }
  
  code-block pre {
    font-size: clamp(0.8rem, 3vw, 0.9rem);
    color: #111827;
  }
  
  /* فوتر */
  .footer {
    background: linear-gradient(to right, #10B981, #34D399);
    padding: 1rem 0;
    text-align: center;
    color: #FFFFFF;
    font-size: clamp(0.8rem, 3vw, 0.95rem);
  }
  
  .footer p {
    margin: 0.4rem 0;
  }
  
  /* ریسپانسیو */
  @media (max-width: 600px) {
    .header, .hero, .lessons, .lesson-content {
      padding: 1.5rem 0;
    }
  
    .btn, .lesson-btn {
      padding: 0.7rem 1.5rem;
    }
  
    .lesson-card, .lesson-text {
      padding: 1.2rem;
    }
  
    .container {
      padding: 0 3vw;
    }
  
    .lessons-grid {
      gap: 1rem;
    }
  }
  
  @media (min-width: 900px) {
    .lessons-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }