/* Code Block Fullscreen Styles
 * Used by code-fullscreen.js for expanded code view
 * Button is provided by .fullscreen-btn in code-block.css toolbar
 */

/* ========================================
   CSS Variables (theme support)
   ======================================== */
:root {
  --fs-backdrop: rgba(0, 0, 0, 0.92);
  --fs-code-bg: #1e1e1e;
  --fs-text: #ffffff;
  --fs-border: rgba(255, 255, 255, 0.2);
  --fs-btn-bg: rgba(255, 255, 255, 0.1);
  --fs-btn-bg-hover: rgba(255, 255, 255, 0.2);
  --fs-z-overlay: 9999;
  --fs-z-controls: 10000;
  --fs-z-hint: 10001;
}

/* Light theme - still use dark overlay for code readability */
:root:not(.dark) {
  --fs-backdrop: rgba(30, 30, 30, 0.95);
}

/* ========================================
   Fullscreen Container
   ======================================== */
.code-fullscreen__container {
  position: fixed;
  inset: 0;
  background-color: var(--fs-backdrop);
  color: var(--fs-text);
  z-index: var(--fs-z-overlay);
  overflow: auto;
  padding: 1.25rem;
  box-sizing: border-box;
  visibility: hidden;
  opacity: 0;
  transition: opacity var(--fs-animation-duration, 200ms) ease;
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  outline: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
}

.code-fullscreen__container--open {
  visibility: visible;
  opacity: 1;
}

/* ========================================
   Content Wrapper
   ======================================== */
.code-fullscreen__content {
  width: 100%;
  max-width: 95%;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
}

/* ========================================
   Active Code Block (expressive-code wrapper)
   ======================================== */
.expressive-code.code-fullscreen__active {
  width: 100%;
  max-width: none;
  height: auto;
  margin: 0 0 4rem 0;
  box-shadow: 0 1.25rem 3.75rem rgba(0, 0, 0, 0.5);
}

.expressive-code.code-fullscreen__active pre {
  max-height: none;
  border-radius: 0.5rem;
}

.expressive-code.code-fullscreen__active pre,
.expressive-code.code-fullscreen__active code {
  font-size: calc(1em * var(--code-font-scale, 1));
}

/* ========================================
   Close Button
   ======================================== */
.code-fullscreen__close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0.5rem;
  background: var(--fs-btn-bg);
  border: 1px solid var(--fs-border);
  border-radius: 0.375rem;
  cursor: pointer;
  color: var(--fs-text);
  transition: background 0.2s ease, transform 0.2s ease;
  flex-shrink: 0;
}

.code-fullscreen__close:hover {
  background: var(--fs-btn-bg-hover);
  transform: scale(1.05);
}

.code-fullscreen__close:focus {
  outline: 2px solid rgba(255, 255, 255, 0.5);
  outline-offset: 2px;
}

.code-fullscreen__close svg {
  width: 1.25rem;
  height: 1.25rem;
}

/* ========================================
   Escape Hint
   ======================================== */
.code-fullscreen__hint {
  position: fixed;
  bottom: 1.25rem;
  left: 50%;
  transform: translateX(-50%);
  background-color: rgba(0, 0, 0, 0.85);
  color: var(--fs-text);
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-family: system-ui, -apple-system, sans-serif;
  opacity: 0;
  animation: fsHintShow 0.3s ease 0.5s forwards;
  pointer-events: none;
  z-index: var(--fs-z-hint);
  backdrop-filter: blur(4px);
  border: 1px solid var(--fs-border);
}

@keyframes fsHintShow {
  to { opacity: 0.9; }
}

.code-fullscreen__hint kbd {
  background-color: rgba(255, 255, 255, 0.2);
  padding: 0.125rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  margin: 0 0.125rem;
}

/* ========================================
   Font Size Controls
   ======================================== */
.code-fullscreen__toolbar {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 0.5rem 0.75rem;
  background: rgba(90, 88, 88, 0.95);
  border: 1px solid var(--fs-border);
  border-radius: 0.5rem;
}

.code-fullscreen__toolbar-spacer {
  flex: 1;
}

.code-fullscreen__toolbar-end {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.code-fullscreen__font-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.code-fullscreen__font-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0.5rem;
  background: var(--fs-btn-bg);
  border: 1px solid var(--fs-border);
  border-radius: 0.375rem;
  cursor: pointer;
  color: var(--fs-text);
  transition: background 0.2s ease, transform 0.2s ease;
}

.code-fullscreen__font-btn:hover {
  background: var(--fs-btn-bg-hover);
  transform: scale(1.05);
}

.code-fullscreen__font-btn:focus {
  outline: 2px solid rgba(255, 255, 255, 0.5);
  outline-offset: 2px;
}

.code-fullscreen__font-btn:active {
  transform: scale(0.95);
}

.code-fullscreen__font-btn svg {
  width: 1rem;
  height: 1rem;
  stroke-width: 2.5;
}

/* ========================================
   Mobile Optimizations
   ======================================== */
@media (max-width: 768px) {
  .code-fullscreen__container {
    padding: 0.75rem;
  }

  .code-fullscreen__content {
    max-width: 100%;
  }

  .expressive-code.code-fullscreen__active {
    margin-bottom: 2rem;
  }

  .expressive-code.code-fullscreen__active pre {
    border-radius: 0.375rem;
  }

  .code-fullscreen__close {
    width: 2.25rem;
    height: 2.25rem;
  }

  .code-fullscreen__hint {
    bottom: 0.75rem;
    font-size: 0.8rem;
    padding: 0.5rem 0.75rem;
  }

  .code-fullscreen__font-btn {
    width: 2.25rem;
    height: 2.25rem;
  }
}

/* ========================================
   Accessibility
   ======================================== */
@media (prefers-reduced-motion: reduce) {
  .code-fullscreen__container {
    transition: none;
  }

  .code-fullscreen__container--open {
    transform: none;
  }

  .code-fullscreen__close,
  .code-fullscreen__font-btn {
    transition: none;
  }

  .code-fullscreen__close:hover,
  .code-fullscreen__font-btn:hover {
    transform: none;
  }

  .code-fullscreen__hint {
    animation: none;
    opacity: 0.9;
  }
}