/* ===================================
   LUCEM PUBLISHERS - THEME SYSTEM
   Light & Dark Mode with Smooth Transitions
   =================================== */

:root {
  /* ===== LUCEM BRAND COLORS ===== */
  --lucem-blue: #0B6FB5;
  --lucem-dark-blue: #094A7A;
  --lucem-light-blue: #E8F4F8;
  --lucem-yellow: #FFD700;
  --lucem-dark-yellow: #FFC107;

  /* ===== LIGHT THEME (DEFAULT) ===== */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F5F7FA;
  --bg-tertiary: #FFFFFF;
  --bg-accent: #E8F4F8;

  --text-primary: #34495E;
  --text-secondary: #7F8C8D;
  --text-tertiary: #95A5A6;
  --text-inverse: #FFFFFF;

  --border-color: #E0E0E0;
  --border-light: #ECF0F1;
  --divider-color: #ECF0F1;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(11, 111, 181, 0.12);
  --shadow-lg: 0 8px 32px rgba(11, 111, 181, 0.16);
  --shadow-xl: 0 16px 48px rgba(11, 111, 181, 0.20);

  /* ===== SEMANTIC COLORS ===== */
  --color-success: #27AE60;
  --color-warning: #E67E22;
  --color-error: #E74C3C;
  --color-info: #3498DB;

  /* ===== GRADIENTS ===== */
  --gradient-primary: linear-gradient(135deg, var(--lucem-blue) 0%, var(--lucem-dark-blue) 100%);
  --gradient-accent: linear-gradient(90deg, var(--lucem-yellow), var(--lucem-dark-yellow));
  --gradient-hero: linear-gradient(135deg, var(--lucem-light-blue) 0%, #FFFFFF 50%, var(--lucem-light-blue) 100%);

  /* ===== SPACING ===== */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* ===== TYPOGRAPHY ===== */
  --font-family-base: 'Segoe UI', 'Roboto', 'Arial', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  /* ===== BORDERS & RADIUS ===== */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
  --border-radius-full: 9999px;

  /* ===== TRANSITIONS ===== */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-all: all var(--transition-base);

  /* ===== Z-INDEX LAYERS ===== */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* ===== DARK THEME ===== */
[data-theme="dark"] {
  /* Dark Slate / Gunmetal Gray Theme */
  --bg-primary: #1E2430;
  --bg-secondary: #2A3140;
  --bg-tertiary: #181D27;
  --bg-accent: rgba(93, 109, 126, 0.15);

  --text-primary: #E8EAED;
  --text-secondary: #B4B8BF;
  --text-tertiary: #8B909A;
  --text-inverse: #1E2430;

  --border-color: #2C3E50;
  --border-light: #34495E;
  --divider-color: #2C3E50;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);

  /* Adjust Lucem colors for dark mode */
  --lucem-blue: #5DADE2;
  --lucem-dark-blue: #3498DB;
  --lucem-light-blue: rgba(93, 173, 226, 0.15);
  --lucem-yellow: #FFD700;
  --lucem-dark-yellow: #FFC107;

  --gradient-primary: linear-gradient(135deg, var(--lucem-blue) 0%, var(--lucem-dark-blue) 100%);
  --gradient-hero: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 50%, var(--bg-tertiary) 100%);
}

/* ===== SMOOTH THEME TRANSITION ===== */
*,
*::before,
*::after {
  transition: background-color var(--transition-base),
              border-color var(--transition-base),
              color var(--transition-base),
              box-shadow var(--transition-base);
}

/* Exclude specific elements from theme transition */
.no-transition,
.no-transition *,
button,
input,
select,
textarea {
  transition: none !important;
}

/* Re-enable transition for interactive states */
button,
input,
select,
textarea {
  transition: background-color var(--transition-fast),
              border-color var(--transition-fast),
              transform var(--transition-fast),
              box-shadow var(--transition-fast);
}

/* ===== THEME TOGGLE BUTTON ===== */
.theme-toggle {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-full);
  cursor: pointer;
  transition: var(--transition-all);
}

.theme-toggle:hover {
  background: var(--bg-accent);
  border-color: var(--lucem-blue);
  transform: scale(1.05);
}

.theme-toggle svg {
  position: absolute;
  width: 20px;
  height: 20px;
  color: var(--text-primary);
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.sun-icon {
  opacity: 1;
  transform: rotate(0deg);
}

.moon-icon {
  opacity: 0;
  transform: rotate(90deg);
}

[data-theme="dark"] .sun-icon {
  opacity: 0;
  transform: rotate(90deg);
}

[data-theme="dark"] .moon-icon {
  opacity: 1;
  transform: rotate(0deg);
}

/* ===== LANGUAGE SWITCHER ===== */
.language-switcher {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-full);
}

.lang-btn {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: var(--transition-all);
}

.lang-btn.active {
  color: var(--lucem-blue);
  background: var(--bg-primary);
  box-shadow: var(--shadow-sm);
}

.lang-btn:hover:not(.active) {
  color: var(--text-primary);
  background: var(--bg-accent);
}

.lang-divider {
  color: var(--border-color);
  font-size: var(--font-size-sm);
}

/* ===== RESPONSIVE UTILITIES ===== */
.desktop-only {
  display: block;
}

.mobile-only {
  display: none;
}

@media (max-width: 1024px) {
  .desktop-only {
    display: none;
  }

  .mobile-only {
    display: block;
  }
}

/* ===== ACCESSIBILITY - REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== FOCUS STATES (ACCESSIBILITY) ===== */
*:focus {
  outline: 2px solid var(--lucem-yellow);
  outline-offset: 2px;
}

*:focus:not(:focus-visible) {
  outline: none;
}

*:focus-visible {
  outline: 2px solid var(--lucem-yellow);
  outline-offset: 2px;
}

/* ===== SCROLLBAR STYLING ===== */
::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: var(--border-radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--lucem-blue);
}

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) var(--bg-secondary);
}

/* ===== SELECTION COLORS ===== */
::selection {
  background: var(--lucem-yellow);
  color: var(--text-inverse);
}

::-moz-selection {
  background: var(--lucem-yellow);
  color: var(--text-inverse);
}