:root {
  /* BRAND COLORS */
  --primary: #0073ff;
  --primary-hover: #0077ff;
  --primary-soft: #e0e7ff;

  --secondary: #00a86b;
  --secondary-soft: #eafff1;

  --accent-purple: #4b3ded;
  --accent-purple-soft: #edeaff;

  --accent-yellow: #ffb400;
  --accent-yellow-soft: #fff7e4;

  --accent-red: #ff3d63;
  --accent-red-soft: #ffe8ee;

  /* BACKGROUNDS */
  --bg-main: #ffffff;
  --bg-light: #f8fafc;
  --bg-section: #f0f8ff;
  --bg-card: #ffffff;
  --bg-muted: #f0f2f5;

  /* TEXT COLORS */
  --text-primary: #0f172a;
  --text-heading: #333333;
  --text-secondary: #6b7280;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;

  /* BORDERS */
  --border-light: #e5e7eb;
  --border-soft: #e2e8f0;
  --border-card: #e7ecf5;
  --border-btn: #d9dce3;

  /* SHADOWS */
  --shadow-sm: 0px 6px 24px rgba(0, 0, 0, 0.06);
  --shadow-md: 0px 12px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0px 12px 28px rgba(0, 0, 0, 0.08);
}

/* Dark Theme */
[data-theme="dark"] {
  --bg-main: #0b0f19;
  --bg-light: #111827;
  --bg-section: #0f172a;
  --bg-card: #1f2937;
  --bg-muted: #374151;

  --text-primary: #f9fafb;
  --text-heading: #ffffff;
  --text-secondary: #d1d5db;
  --text-muted: #9ca3af;
  --text-inverse: #111827;

  --border-light: #374151;
  --border-soft: #374151;
  --border-card: #374151;

  --accent-purple-soft: rgba(75, 61, 237, 0.25);
  --primary-soft: rgba(0, 115, 255, 0.25);
  --secondary-soft: rgba(0, 168, 107, 0.25);
  --accent-yellow-soft: rgba(255, 180, 0, 0.25);
  --accent-red-soft: rgba(255, 61, 99, 0.25);

  --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.6);
}

/* Dark mode element styling overrides */
[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select {
  background-color: #1f2937 !important;
  color: #f9fafb !important;
  border-color: #374151 !important;
}

[data-theme="dark"] .form-control::placeholder {
  color: #9ca3af !important;
}

[data-theme="dark"] .modal-content {
  background-color: #1f2937 !important;
  color: #f9fafb !important;
  border-color: #374151 !important;
}

[data-theme="dark"] .card {
  background-color: #1f2937 !important;
  border-color: #374151 !important;
  color: #f9fafb !important;
}

[data-theme="dark"] .text-muted {
  color: var(--text-secondary) !important;
  opacity: 1 !important;
}

[data-theme="dark"] .lead.text-muted,
[data-theme="dark"] .lead {
  color: var(--text-primary) !important;
}

/* Smooth theme transition */
body, .detail-container, .profile-card, .upload-card, .top-nav, .edu-footer {
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}