/* ===== UPLOAD SECTION ===== */
@layer components {
  .upload-section {
    padding: var(--space-10);
    justify-self: center;
    margin-bottom: var(--space-12);
    transition: all var(--duration-300) var(--ease-out);
    animation: fadeInUp var(--duration-700) var(--ease-spring) 0.6s both;
  }

  .upload-area {
    text-align: center;
    cursor: pointer;
    padding: var(--space-12);
    border: 2px dashed var(--color-border);
    border-radius: var(--border-radius-xl);
    transition: all var(--duration-300) var(--ease-out);
    position: relative;
    overflow: hidden;
    min-height: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-surface) 0%, transparent 100%);
  }

  .upload-area:hover {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, rgba(0, 255, 136, 0.05) 0%, transparent 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
  }

  .upload-area:focus-within {
    border-color: var(--color-border-focus);
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
  }

  .upload-area.drag-over {
    border-color: #9ff441;
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.02);
  }

  .upload-visual {
    margin-bottom: var(--space-8);
  }

  .upload-icon-container {
    position: relative;
    display: inline-block;
    margin-bottom: var(--space-6);
  }

  .upload-icon {
    font-size: var(--font-size-6xl);
    filter: drop-shadow(0 0 24px var(--color-primary));
    transition: all var(--duration-300) var(--ease-out);
    color: var(--color-primary);
  }

  .upload-area:hover .upload-icon {
    transform: scale(1.1);
    filter: drop-shadow(0 0 32px var(--color-primary));
  }

  .upload-pulse {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120%;
    height: 120%;
    border: 2px solid var(--color-primary);
    border-radius: 50%;
    opacity: 0;
    animation: pulse-ring 2s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
  }

  @keyframes pulse-ring {
    0% {
      transform: translate(-50%, -50%) scale(0.8);
      opacity: 1;
    }
    100% {
      transform: translate(-50%, -50%) scale(2);
      opacity: 0;
    }
  }

  .upload-text h2 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-2);
    color: var(--color-text-primary);
  }

  .upload-subtext {
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
  }

  .click-text {
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
    text-decoration: underline;
    text-decoration-color: transparent;
    transition: text-decoration-color var(--duration-200) var(--ease-out);
  }

  .upload-area:hover .click-text {
    text-decoration-color: var(--color-primary);
  }

  .upload-specs {
    display: flex;
    justify-content: center;
    gap: var(--space-6);
    margin-top: var(--space-8);
    flex-wrap: wrap;
  }

  .spec-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    padding: var(--space-2) var(--space-4);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-full);
    transition: all var(--duration-200) var(--ease-out);
  }

  .spec-item:hover {
    color: var(--color-text-secondary);
    border-color: var(--color-border-hover);
    background: var(--color-surface-hover);
  }

  .spec-icon {
    font-size: var(--font-size-lg);
    color: var(--color-primary);
  }

  /* Hidden file input */
  .upload-input {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 10;
  }

  /* Mobile optimizations */
  @media (max-width: 768px) {
    .upload-section {
      padding: var(--space-6) var(--space-4);
    }

    .upload-area {
      min-height: 250px;
      padding: var(--space-8);
    }

    .upload-icon {
      font-size: var(--font-size-5xl);
    }

    .upload-text h2 {
      font-size: var(--font-size-xl);
    }

    .upload-subtext {
      font-size: var(--font-size-base);
    }

    .upload-specs {
      gap: var(--space-4);
    }

    .spec-item {
      font-size: var(--font-size-xs);
      padding: var(--space-1) var(--space-3);
    }
  }

  /* Animation */
  @keyframes fadeInUp {
    from {
      opacity: 0;
      transform: translateY(20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}