:root {
  --primary-color: #2dd4bf;
  --primary-dark: #14b8a6;
  --secondary-color: #64748b;
  --accent-color: #f59e0b;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-light: #9ca3af;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: #ffffff;
  --border-color: #e5e7eb;
  --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-heavy: 0 20px 25px rgba(0, 0, 0, 0.1);
  --border-radius: 12px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

[data-theme='dark'] {
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-light: #9ca3af;
  --bg-primary: #111827;
  --bg-secondary: #1f2937;
  --bg-card: #374151;
  --border-color: #4b5563;
  --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.3);
  --shadow-heavy: 0 20px 25px rgba(0, 0, 0, 0.3);
}

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

body {
  font-family: var(--font-primary);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: var(--transition);
}

.portfolio {
  max-width: 1200px;
  margin: 120px auto;
  padding: 0 20px;
  text-align: center;
}

.portfolio h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 20px;
}

.portfolio p {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 50px;
  line-height: 1.7;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.card {
  background: var(--bg-card);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  padding: 20px;
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid var(--border-color);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-heavy);
  border-color: var(--primary-color);
}

.card img {
  width: 100%;
  border-radius: 8px;
  margin-bottom: 15px;
}

.card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: var(--bg-card);
  padding: 40px 30px;
  border-radius: var(--border-radius);
  max-width: 600px;
  width: 90%;
  text-align: left;
  position: relative;
  box-shadow: var(--shadow-medium);
  transition: var(--transition);
  border: 1px solid var(--border-color);
}

#closeModal {
  position: absolute;
  top: 12px;
  right: 15px;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-secondary);
  transition: var(--transition);
}

#closeModal:hover {
  color: var(--primary-color);
}

@media (max-width: 768px) {
  .portfolio {
    margin: 80px auto;
  }

  .portfolio h1 {
    font-size: 2rem;
  }

  .portfolio p {
    font-size: 16px;
    margin-bottom: 30px;
  }

  .portfolio-grid {
    gap: 20px;
  }

  .modal-content {
    padding: 20px;
  }
}

@media (max-width: 480px) {
  .portfolio {
    margin: 60px auto;
  }

  .card {
    padding: 15px;
  }

  .card h3 {
    font-size: 1rem;
  }
}