/**
 * Blog Presentation Mode
 * Full-viewport slide renderer for blog posts
 * Zero dependencies — pure CSS
 */

/* ─── Presentation container ─── */
.presentation-mode {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: #0f172a;
  color: #f8fafc;
  overflow: hidden;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

/* ─── Slide viewport ─── */
.presentation-slides {
  width: 100%;
  height: 100%;
  position: relative;
}

.presentation-slide {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 4rem 8rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, transform 0.4s ease;
  transform: translateX(40px);
}

.presentation-slide.active {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
}

.presentation-slide.exiting-left {
  opacity: 0;
  transform: translateX(-40px);
}

/* ─── Title slide ─── */
.presentation-slide.slide-title {
  text-align: center;
  justify-content: center;
}

.presentation-slide.slide-title h1 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, #818cf8, #6366f1, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.presentation-slide.slide-title .slide-subtitle {
  font-size: 1.25rem;
  color: #94a3b8;
  max-width: 40rem;
  margin: 0 auto 2rem;
  line-height: 1.6;
}

.presentation-slide.slide-title .slide-meta {
  font-size: 0.875rem;
  color: #64748b;
}

/* ─── Content slides ─── */
.slide-heading {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 2.5rem;
  color: #e2e8f0;
  line-height: 1.2;
  border-bottom: 3px solid #6366f1;
  padding-bottom: 0.75rem;
}

.slide-bullets {
  list-style: none;
  padding: 0;
  margin: 0;
  max-width: 52rem;
}

.slide-bullets li {
  font-size: 1.5rem;
  line-height: 1.5;
  margin-bottom: 1.25rem;
  padding-left: 2rem;
  position: relative;
  color: #cbd5e1;
}

.slide-bullets li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.65rem;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: #6366f1;
}

/* ─── Navigation bar ─── */
.presentation-nav {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 2rem;
  background: rgba(15, 23, 42, 0.9);
  border-top: 1px solid #1e293b;
  z-index: 10;
}

.presentation-nav button {
  background: none;
  border: 1px solid #334155;
  color: #94a3b8;
  padding: 0.5rem 1rem;
  border-radius: 0.375rem;
  cursor: pointer;
  font-size: 0.875rem;
  transition: all 0.2s;
}

.presentation-nav button:hover {
  background: #1e293b;
  color: #e2e8f0;
  border-color: #475569;
}

.presentation-nav button:disabled {
  opacity: 0.3;
  cursor: default;
}

.presentation-nav button:disabled:hover {
  background: none;
  color: #94a3b8;
  border-color: #334155;
}

.slide-counter {
  font-size: 0.875rem;
  color: #64748b;
  font-variant-numeric: tabular-nums;
}

.slide-progress {
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  background: #6366f1;
  transition: width 0.4s ease;
}

/* ─── Notes panel ─── */
.presentation-notes {
  position: absolute;
  bottom: 3.5rem;
  left: 0;
  right: 0;
  max-height: 0;
  overflow: hidden;
  background: #1e293b;
  border-top: 1px solid #334155;
  transition: max-height 0.3s ease;
  z-index: 5;
}

.presentation-notes.open {
  max-height: 14rem;
}

.presentation-notes-inner {
  padding: 1.25rem 2rem;
}

.presentation-notes-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #6366f1;
  margin-bottom: 0.5rem;
}

.presentation-notes-text {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: #94a3b8;
  max-height: 10rem;
  overflow-y: auto;
}

/* ─── Keyboard hints (shown briefly on enter) ─── */
.presentation-hints {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(30, 41, 59, 0.95);
  border: 1px solid #334155;
  border-radius: 0.75rem;
  padding: 2rem 3rem;
  z-index: 20;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}

.presentation-hints.visible {
  opacity: 1;
  pointer-events: auto;
}

.presentation-hints h3 {
  font-size: 1rem;
  font-weight: 600;
  color: #e2e8f0;
  margin-bottom: 1rem;
  text-align: center;
}

.presentation-hints dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.5rem 1.5rem;
}

.presentation-hints dt {
  font-family: monospace;
  font-size: 0.875rem;
  color: #6366f1;
  text-align: right;
}

.presentation-hints dd {
  font-size: 0.875rem;
  color: #94a3b8;
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .presentation-slide {
    padding: 3rem 2rem;
  }

  .presentation-slide.slide-title h1 {
    font-size: 2rem;
  }

  .slide-heading {
    font-size: 1.5rem;
  }

  .slide-bullets li {
    font-size: 1.125rem;
  }

  .presentation-nav {
    padding: 0.5rem 1rem;
  }
}

@media (max-width: 480px) {
  .presentation-slide {
    padding: 2rem 1.25rem;
  }

  .presentation-slide.slide-title h1 {
    font-size: 1.5rem;
  }

  .slide-heading {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
  }

  .slide-bullets li {
    font-size: 1rem;
    margin-bottom: 0.75rem;
  }
}

/* ─── Print: one slide per page ─── */
@media print {
  .presentation-mode {
    position: static;
    background: white;
    color: #1f2937;
    overflow: visible;
  }

  .presentation-slides {
    position: static;
  }

  .presentation-slide {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    page-break-after: always;
    min-height: 100vh;
    padding: 3rem 4rem;
    border-bottom: 1px solid #e5e7eb;
  }

  .presentation-slide:last-child {
    page-break-after: avoid;
  }

  .presentation-slide.slide-title h1 {
    background: none;
    -webkit-text-fill-color: #1f2937;
    color: #1f2937;
  }

  .slide-heading {
    color: #1f2937;
    border-bottom-color: #6366f1;
  }

  .slide-bullets li {
    color: #374151;
  }

  .slide-bullets li::before {
    background: #6366f1;
  }

  .presentation-nav,
  .slide-progress,
  .presentation-hints {
    display: none !important;
  }

  .presentation-notes {
    position: static;
    max-height: none;
    overflow: visible;
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 0.5rem;
    margin-top: 2rem;
  }

  .presentation-notes.open,
  .presentation-notes {
    max-height: none;
  }

  .presentation-notes-inner {
    padding: 1rem 1.5rem;
  }

  .presentation-notes-label {
    color: #6366f1;
  }

  .presentation-notes-text {
    color: #4b5563;
    max-height: none;
    overflow: visible;
  }
}