/* Slide Presentation Styles - Academic Light Mode */

.slide-presentation {
  margin: 0;
  padding: 0;
  overflow: hidden;
  height: 100vh;
  position: relative;
  background: #faf8f3; /* Paper cream to match worksheets */
  font-size: 18px; /* Larger base font for readability */
  line-height: 1.7;
}

/* Force light mode - slides should always be light for classroom projection */
@media (prefers-color-scheme: dark) {
  .slide-presentation {
    background: #faf8f3;
    color: #2d2a26;
  }
}

/* Skip Link for Accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: #2d2a26;
  color: white;
  padding: 8px 16px;
  text-decoration: none;
  font-weight: 700;
  z-index: 2000;
  font-size: 16px;
}

.skip-link:focus {
  top: 0;
}

/* Slide Controls */
.slide-controls {
  position: fixed;
  top: 20px;
  right: 20px;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  background: white;
  padding: 12px 18px;
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  border: 2px solid #2d2a26;
}

.slide-control-btn {
  background: #ff9f43; /* Match orange accent from worksheets */
  color: white;
  border: 2px solid #2d2a26;
  border-radius: var(--radius-md);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 18px;
}

.slide-control-btn:hover {
  background: #2d2a26;
  transform: scale(1.05);
}

.slide-control-btn:focus {
  outline: 3px solid #4a90e2;
  outline-offset: 2px;
}

.slide-control-btn:active {
  transform: scale(0.95);
}

.slide-control-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background: #9e9e9e;
}

.slide-control-btn .icon {
  width: 20px;
  height: 20px;
}

.slide-counter {
  font-weight: 700;
  color: #2d2a26;
  font-size: 18px;
  min-width: 70px;
  text-align: center;
}

/* Slide Progress Bar */
.slide-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: rgba(0, 0, 0, 0.1);
  z-index: 999;
}

.slide-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  transition: width 0.3s ease;
  width: 0%;
}

/* Slides Container */
.slides-container {
  width: 100%;
  height: 100vh;
  overflow: hidden;
  position: relative;
}

.slide {
  display: none;
  width: 100%;
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  position: absolute;
  top: 0;
  left: 0;
  animation: slideIn 0.55s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.slide.active {
  display: block;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(8px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Slide Content */
.slide-content {
  max-width: 1400px;
  width: 95%;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
  box-sizing: border-box;
}

.slide-heading {
  font-size: 42px;
  font-weight: 800;
  margin-bottom: var(--spacing-xl);
  color: #2d2a26;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  line-height: 1.3;
}

.slide-heading .icon {
  width: 48px;
  height: 48px;
  color: #ff9f43;
}

.slide-title-main {
  font-size: 56px;
  font-weight: 900;
  line-height: 1.2;
  line-height: 1.1;
  margin-bottom: var(--spacing-md);
}

.slide-subtitle {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--color-text-muted);
}

.slide-meta {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
  justify-content: center;
}

.slide-level,
.slide-topic {
  background: rgba(99, 102, 241, 0.1);
  color: var(--color-primary);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: var(--font-size-base);
}

.slide-footer {
  text-align: center;
  margin-top: var(--spacing-2xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* Keyboard Shortcuts Help */
.keyboard-shortcuts {
  position: fixed;
  bottom: 20px;
  left: 20px;
  background: rgba(255, 255, 255, 0.95);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  backdrop-filter: blur(10px);
  max-width: 300px;
}

.keyboard-shortcuts h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.keyboard-shortcuts ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.keyboard-shortcuts li {
  padding: var(--spacing-xs) 0;
  font-size: var(--font-size-sm);
  color: var(--color-text);
}

.keyboard-shortcuts kbd {
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
  border-radius: 4px;
  padding: 2px 6px;
  font-family: monospace;
  font-size: 0.85em;
  margin-right: var(--spacing-xs);
}

/* Accessibility Enhancements */

/* High contrast mode support */
@media (prefers-contrast: high) {
  .slide-controls,
  .slide-control-btn,
  .keyboard-shortcuts {
    border-width: 3px;
  }

  .slide-control-btn {
    font-weight: 900;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }

  .slide {
    animation: none;
  }
}

/* Ensure text remains readable at all viewport sizes */
@media (min-width: 1400px) {
  .slide-presentation {
    font-size: 20px;
  }

  .slide-heading {
    font-size: 48px;
  }

  .slide-title-main {
    font-size: 64px;
  }
}

/* Print styles for slides */
@media print {
  .slide-controls,
  .slide-progress,
  .keyboard-shortcuts {
    display: none !important;
  }

  .slide {
    display: block !important;
    page-break-after: always;
    height: auto;
    position: relative;
  }

  .slide-presentation {
    background: white;
    height: auto;
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .slide-controls {
    top: 10px;
    right: 10px;
    padding: 10px 14px;
    gap: var(--spacing-sm);
  }

  .slide-control-btn {
    width: 40px;
    height: 40px;
  }

  .slide-counter {
    font-size: 16px;
    min-width: 60px;
  }

  .keyboard-shortcuts {
    bottom: 10px;
    left: 10px;
    right: 10px;
    max-width: none;
  }

  .slide-heading {
    font-size: 32px;
  }

  .slide-title-main {
    font-size: 40px;
  }
}