/* ==========================================================================
   Slide Viewer Theme — 16:9 HTML Pages
   ========================================================================== */

#slide-viewer-overlay {
  --slide-bg-deep: var(--color-bg-body, #0a0e17);
  --slide-bg-elevated: #1e293b;
  --slide-text-primary: #f1f5f9;
  --slide-text-secondary: #94a3b8;
  --slide-text-tertiary: #64748b;
  --slide-accent-blue: #60a5fa;
  --slide-accent-violet: #a78bfa;
  --slide-accent-green: #34d399;
  --slide-accent-amber: #fbbf24;
  --slide-glass-bg: rgba(17, 24, 39, 0.74);
  --slide-glass-border: rgba(148, 163, 184, 0.14);
  --slide-border-subtle: rgba(148, 163, 184, 0.08);
  --slide-border-medium: rgba(148, 163, 184, 0.18);
  --slide-font-heading: var(--kesson-font-serif-display);
  --slide-font-body: "Inter", "Noto Sans JP", system-ui, sans-serif;
  --slide-font-mono: var(--kesson-font-mono-ui);
  --slide-radius: 16px;
  --slide-radius-sm: 8px;

  position: fixed;
  inset: 0;
  z-index: 1500;
  display: none;
  background:
    radial-gradient(circle at 20% 20%, rgba(96, 165, 250, 0.08), transparent 28%),
    radial-gradient(circle at 80% 10%, rgba(167, 139, 250, 0.08), transparent 24%),
    rgba(5, 10, 19, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

#slide-viewer-overlay.visible {
  display: block;
}

#slide-viewer-overlay .slide-viewer-shell {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 2rem 1.25rem 1.5rem;
}

#slide-viewer-overlay .slide-viewer-frame {
  position: relative;
  width: min(92vw, calc(84vh * 16 / 9));
  aspect-ratio: 16 / 9;
  border-radius: var(--slide-radius);
  border: 1px solid var(--slide-glass-border);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01)),
    rgba(9, 14, 25, 0.96);
  box-shadow: 0 24px 72px rgba(0, 0, 0, 0.42);
  overflow: hidden;
}

#slide-viewer-overlay .slide-viewer-stage {
  position: relative;
  width: 100%;
  height: 100%;
}

#slide-viewer-overlay .slide-viewer-page {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  color: var(--slide-text-primary);
  font-family: var(--slide-font-body);
  text-align: left;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(96, 165, 250, 0.06), transparent 45%),
    radial-gradient(ellipse at 78% 18%, rgba(167, 139, 250, 0.05), transparent 34%),
    var(--slide-bg-deep);
  transition: opacity 220ms ease, visibility 220ms ease;
}

#slide-viewer-overlay .slide-viewer-page.is-active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

#slide-viewer-overlay .slide-content {
  box-sizing: border-box;
  width: 100%;
  height: 100%;
  padding: 2rem 2.5rem;
  overflow: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(148, 163, 184, 0.45) transparent;
}

#slide-viewer-overlay .slide-content::-webkit-scrollbar {
  width: 10px;
}

#slide-viewer-overlay .slide-content::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.35);
  border-radius: 999px;
}

.slide-viewer-close {
  position: fixed;
  top: 16px;
  right: 24px;
  z-index: 1510;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--slide-glass-border);
  border-radius: 999px;
  background: var(--slide-glass-bg);
  color: var(--slide-text-secondary);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  transition: all 0.25s ease;
}

.slide-viewer-close:hover {
  color: var(--slide-text-primary);
  background: rgba(96, 165, 250, 0.12);
  border-color: rgba(96, 165, 250, 0.25);
}

.slide-viewer-fullscreen {
  position: fixed;
  right: 24px;
  bottom: 16px;
  z-index: 1510;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow:
    0 10px 24px rgba(0, 0, 0, 0.18),
    0 0 20px rgba(120, 155, 220, 0.12),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.95);
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.slide-viewer-fullscreen:hover,
.slide-viewer-fullscreen:focus-visible {
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.28);
  box-shadow:
    0 14px 34px rgba(0, 0, 0, 0.22),
    0 0 26px rgba(132, 168, 232, 0.18),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.slide-viewer-close:focus-visible,
.slide-viewer-fullscreen:focus-visible {
  outline: 2px solid var(--kesson-focus-ring, rgba(100, 150, 255, 0.86));
  outline-offset: 2px;
}

#slide-viewer-overlay:fullscreen .slide-viewer-shell,
#slide-viewer-overlay:-webkit-full-screen .slide-viewer-shell {
  padding: 0.75rem;
}

#slide-viewer-overlay:fullscreen .slide-viewer-frame,
#slide-viewer-overlay:-webkit-full-screen .slide-viewer-frame {
  width: min(100vw, calc(100vh * 16 / 9));
  height: min(100vh, calc(100vw * 9 / 16));
  max-width: 100vw;
  max-height: 100vh;
  border-radius: 0;
}

#slide-viewer-overlay:fullscreen .slide-viewer-toolbar,
#slide-viewer-overlay:-webkit-full-screen .slide-viewer-toolbar {
  width: min(100vw, calc(100vh * 16 / 9));
}

#slide-viewer-overlay .slide-viewer-toolbar {
  width: min(92vw, calc(84vh * 16 / 9));
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.75rem;
}

#slide-viewer-overlay .slide-viewer-nav {
  min-width: 72px;
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--slide-glass-border);
  border-radius: 999px;
  background: var(--slide-glass-bg);
  color: var(--slide-text-primary);
  font-family: var(--slide-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.25s ease;
}

#slide-viewer-overlay .slide-viewer-nav:hover:not(:disabled) {
  background: rgba(96, 165, 250, 0.12);
  border-color: rgba(96, 165, 250, 0.28);
}

#slide-viewer-overlay .slide-viewer-nav:disabled {
  opacity: 0.45;
  cursor: default;
}

#slide-viewer-overlay .slide-viewer-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 1rem;
  border: 1px solid var(--slide-glass-border);
  border-radius: 999px;
  background: var(--slide-glass-bg);
  color: var(--slide-text-secondary);
}

#slide-viewer-overlay .slide-viewer-title {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: var(--slide-font-heading);
  font-size: 0.92rem;
  color: var(--slide-text-primary);
  letter-spacing: 0.03em;
}

#slide-viewer-overlay .slide-viewer-count {
  flex: 0 0 auto;
  font-family: var(--slide-font-mono);
  font-size: 0.76rem;
  color: var(--slide-text-tertiary);
}

#slide-viewer-overlay .slide-viewer-page h1,
#slide-viewer-overlay .slide-viewer-page h2,
#slide-viewer-overlay .slide-viewer-page h3 {
  margin-top: 0;
  text-transform: none;
  text-shadow: none;
}

#slide-viewer-overlay .slide-viewer-page h1 {
  font-family: var(--slide-font-heading);
  font-size: 2.2rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.25;
}

#slide-viewer-overlay .slide-viewer-page h2 {
  font-family: var(--slide-font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.3;
  margin-bottom: 0.8em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--slide-border-subtle);
}

#slide-viewer-overlay .slide-viewer-page h3 {
  font-family: var(--slide-font-heading);
  font-size: 1.08rem;
  font-weight: 500;
  color: rgba(167, 139, 250, 0.9);
  letter-spacing: 0.01em;
  margin-bottom: 0.5em;
}

#slide-viewer-overlay .slide-viewer-page p {
  margin: 0 0 0.72em;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--slide-text-primary);
}

#slide-viewer-overlay .slide-viewer-page ul,
#slide-viewer-overlay .slide-viewer-page ol {
  margin: 0;
  padding-left: 1.2em;
  font-size: 0.92rem;
  line-height: 1.75;
}

#slide-viewer-overlay .slide-viewer-page li {
  margin-bottom: 0.5em;
  padding-left: 0.25em;
}

#slide-viewer-overlay .slide-viewer-page ul > li::marker {
  color: var(--slide-accent-blue);
}

#slide-viewer-overlay .slide-viewer-page ol > li::marker {
  color: var(--slide-accent-violet);
  font-family: var(--slide-font-mono);
  font-size: 0.85em;
}

#slide-viewer-overlay .slide-viewer-page strong {
  color: rgba(96, 165, 250, 0.95);
  font-weight: 600;
}

#slide-viewer-overlay .slide-viewer-page em {
  color: var(--slide-text-secondary);
  font-style: italic;
}

#slide-viewer-overlay .slide-viewer-page blockquote {
  margin: 1em 0;
  padding: 1rem 1.4rem;
  border: 1px solid var(--slide-glass-border);
  border-left: 3px solid var(--slide-accent-blue);
  border-radius: 0 var(--slide-radius-sm) var(--slide-radius-sm) 0;
  background: rgba(17, 24, 39, 0.58);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

#slide-viewer-overlay .slide-viewer-page table {
  width: 100%;
  margin: 1em 0;
  border-collapse: separate;
  border-spacing: 0;
  border: 1px solid var(--slide-border-subtle);
  border-radius: 12px;
  overflow: hidden;
  font-size: 0.8rem;
}

#slide-viewer-overlay .slide-viewer-page th {
  padding: 0.65em 0.9em;
  background: var(--slide-bg-elevated);
  border-bottom: 1px solid var(--slide-border-medium);
  text-align: left;
  color: var(--slide-text-secondary);
  font-family: var(--slide-font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

#slide-viewer-overlay .slide-viewer-page td {
  padding: 0.55em 0.9em;
  border-bottom: 1px solid var(--slide-border-subtle);
  text-align: left;
}

#slide-viewer-overlay .slide-viewer-page tr:last-child td {
  border-bottom: none;
}

#slide-viewer-overlay .slide-viewer-page code {
  padding: 0.15em 0.4em;
  border-radius: 4px;
  background: rgba(52, 211, 153, 0.08);
  color: var(--slide-accent-green);
  font-family: var(--slide-font-mono);
  font-size: 0.82em;
}

#slide-viewer-overlay .slide-viewer-page pre {
  width: 100%;
  margin: 1em 0;
  box-shadow: none;
}

#slide-viewer-overlay .slide-viewer-page pre code {
  display: block;
  max-height: 42vh;
  overflow: auto;
  padding: 1em 1.2em;
  border: 1px solid var(--slide-border-subtle);
  border-radius: var(--slide-radius-sm);
  background: rgba(0, 0, 0, 0.35);
  color: var(--slide-text-primary);
}

#slide-viewer-overlay .slide-viewer-page img {
  display: block;
  max-width: 82%;
  max-height: 42vh;
  margin: 0.8em auto;
  border: 1px solid var(--slide-border-subtle);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

#slide-viewer-overlay .slide-viewer-page img[src$=".svg"] {
  max-width: 72%;
  padding: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 18px 40px rgba(2, 6, 23, 0.22);
  border-radius: 12px;
}

#slide-viewer-overlay .slide-inline-svg {
  width: min(72%, 640px);
  margin: 0.8em auto;
  padding: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  box-shadow: 0 18px 40px rgba(2, 6, 23, 0.22);
}

#slide-viewer-overlay .slide-inline-svg svg {
  display: block;
  width: 100%;
  height: auto;
}

/* 図解サムネイル（タイトルスライド右下） */
#slide-viewer-overlay .slide-diagram-thumbnail {
  position: absolute;
  bottom: 2rem;
  right: 2rem;
  width: min(30%, 200px);
  opacity: 0.6;
}

#slide-viewer-overlay .slide-diagram-thumbnail:hover {
  opacity: 1;
}

#slide-viewer-overlay .slide-viewer-page.slide-title .slide-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2.5rem 3rem;
}

#slide-viewer-overlay .slide-viewer-page.slide-title h2 {
  font-size: 2rem;
  border-bottom: none;
  margin-bottom: 0.3em;
  letter-spacing: 0.05em;
}

#slide-viewer-overlay .slide-viewer-page.slide-title h2::after {
  content: "";
  display: block;
  width: 60px;
  height: 2px;
  margin: 0.6em auto 0;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--slide-accent-blue), var(--slide-accent-violet));
}

#slide-viewer-overlay .slide-viewer-page.slide-title p {
  max-width: 80%;
  font-size: 1.08rem;
  color: var(--slide-text-secondary);
  letter-spacing: 0.04em;
}

#slide-viewer-overlay .slide-viewer-page.slide-visual .slide-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  text-align: center;
}

#slide-viewer-overlay .slide-viewer-page.slide-visual h2 {
  border-bottom: none;
  margin-bottom: 0;
}

#slide-viewer-overlay .slide-viewer-page.slide-visual img {
  max-width: 92%;
  max-height: 58vh;
  margin: 0;
}

#slide-viewer-overlay .slide-viewer-page.slide-visual img[src$=".svg"] {
  padding: 1.25rem;
}

#slide-viewer-overlay .slide-viewer-page.slide-visual .slide-inline-svg {
  width: min(92%, 760px);
  margin: 0;
  padding: 1.25rem;
}

#slide-viewer-overlay .slide-viewer-page.slide-overview ul,
#slide-viewer-overlay .slide-viewer-page.slide-conclusion ul {
  list-style: none;
  padding-left: 0;
}

#slide-viewer-overlay .slide-viewer-page.slide-overview li {
  padding: 0.7em 1.2em;
  border: 1px solid var(--slide-glass-border);
  border-left: 3px solid var(--slide-accent-blue);
  border-radius: var(--slide-radius-sm);
  background: rgba(17, 24, 39, 0.58);
  margin-bottom: 0.6em;
}

#slide-viewer-overlay .slide-viewer-page.slide-overview li::marker {
  content: "";
}

#slide-viewer-overlay .slide-viewer-page.slide-table .slide-content {
  padding: 1.6rem 2rem;
}

#slide-viewer-overlay .slide-viewer-page.slide-table h2 {
  font-size: 1.28rem;
  margin-bottom: 0.55em;
}

#slide-viewer-overlay .slide-viewer-page.slide-entry .slide-content {
  padding: 1.75rem 2.25rem;
}

#slide-viewer-overlay .slide-viewer-page.slide-entry p {
  font-size: 0.88rem;
  line-height: 1.78;
}

#slide-viewer-overlay .slide-viewer-page.slide-entry strong {
  display: inline-block;
  margin-right: 0.3em;
  padding: 0.15em 0.6em;
  border-radius: 999px;
  font-family: var(--slide-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

#slide-viewer-overlay .slide-viewer-page.slide-conclusion h2::after {
  content: "";
  display: block;
  width: 40px;
  height: 2px;
  margin-top: 0.4em;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--slide-accent-green), transparent);
}

#slide-viewer-overlay .slide-viewer-page.slide-conclusion li {
  padding: 0.5em 0;
  border-bottom: 1px solid var(--slide-border-subtle);
  font-size: 0.95rem;
}

#slide-viewer-overlay .slide-viewer-page.slide-conclusion li:last-child {
  border-bottom: none;
}

/* ── Patterns slide (横断・比較) ── */

#slide-viewer-overlay .slide-viewer-page.slide-patterns h2::after {
  content: "";
  display: block;
  width: 40px;
  height: 2px;
  margin-top: 0.4em;
  background: linear-gradient(90deg, var(--slide-accent-violet), var(--slide-accent-blue));
  border-radius: 2px;
}

/* ── Questions slide (問い・未解決) ── */

#slide-viewer-overlay .slide-viewer-page.slide-questions h2 {
  color: rgba(167, 139, 250, 0.9);
  border-bottom-color: rgba(167, 139, 250, 0.2);
}

#slide-viewer-overlay .slide-viewer-page.slide-questions li {
  padding: 0.55em 1em 0.55em 1.5em;
  border-left: 2px solid rgba(167, 139, 250, 0.4);
  margin-bottom: 0.5em;
}

/* ── Entry slide — strong pill background ── */

#slide-viewer-overlay .slide-viewer-page.slide-entry strong {
  background: rgba(96, 165, 250, 0.12);
  color: var(--slide-accent-blue);
}

/* ── Table striping & first-column emphasis ── */

#slide-viewer-overlay .slide-viewer-page tr:nth-child(even) td {
  background: rgba(255, 255, 255, 0.025);
}

#slide-viewer-overlay .slide-viewer-page td:first-child {
  color: var(--slide-text-primary);
  font-weight: 500;
}

/* ── h2 accent line for regular content slides ── */

#slide-viewer-overlay .slide-viewer-page:not(.slide-title):not(.slide-visual) h2 {
  padding-bottom: 0.4em;
  background: linear-gradient(90deg, rgba(96, 165, 250, 0.5), transparent);
  background-size: 100% 1px;
  background-position: bottom;
  background-repeat: no-repeat;
  border-bottom: none;
}

@media (max-width: 900px) {
  #slide-viewer-overlay .slide-viewer-shell {
    padding: 1.25rem 0.85rem 1rem;
  }

  #slide-viewer-overlay .slide-viewer-frame,
  #slide-viewer-overlay .slide-viewer-toolbar {
    width: min(96vw, calc(78vh * 16 / 9));
  }

  #slide-viewer-overlay .slide-content {
    padding: 1.25rem 1.35rem;
  }

  #slide-viewer-overlay .slide-viewer-page.slide-title .slide-content,
  #slide-viewer-overlay .slide-viewer-page.slide-entry .slide-content,
  #slide-viewer-overlay .slide-viewer-page.slide-table .slide-content {
    padding: 1.25rem 1.35rem;
  }

  #slide-viewer-overlay .slide-viewer-page h1 {
    font-size: 1.7rem;
  }

  #slide-viewer-overlay .slide-viewer-page h2 {
    font-size: 1.2rem;
  }

  #slide-viewer-overlay .slide-viewer-page p,
  #slide-viewer-overlay .slide-viewer-page ul,
  #slide-viewer-overlay .slide-viewer-page ol {
    font-size: 0.85rem;
  }

  #slide-viewer-overlay .slide-viewer-page img {
    max-width: 94%;
  }

  #slide-viewer-overlay .slide-viewer-toolbar {
    grid-template-columns: 1fr;
  }

  #slide-viewer-overlay .slide-viewer-meta {
    order: -1;
  }
}

/* ==========================================================================
   Mobile — phone portrait (≤575px)
   ========================================================================== */

@media (max-width: 575px) {
  #slide-viewer-overlay .slide-viewer-shell {
    padding: 0.75rem 0.5rem 0.6rem;
    gap: 0.5rem;
  }

  #slide-viewer-overlay .slide-viewer-frame {
    width: min(100%, calc((100vh - 8.75rem) * 16 / 9));
    max-width: 100%;
    max-height: calc((100vw - 1rem) * 9 / 16);
    aspect-ratio: 16 / 9;
    flex: 0 0 auto;
    border-radius: 12px;
  }

  #slide-viewer-overlay .slide-viewer-toolbar {
    width: 100%;
  }

  #slide-viewer-overlay .slide-content {
    padding: 1rem 1rem;
  }

  #slide-viewer-overlay .slide-viewer-page.slide-title .slide-content {
    padding: 1.25rem 1rem;
  }

  #slide-viewer-overlay .slide-viewer-page.slide-entry .slide-content,
  #slide-viewer-overlay .slide-viewer-page.slide-table .slide-content {
    padding: 1rem 1rem;
  }

  /* Typography — larger for readability on small screens */
  #slide-viewer-overlay .slide-viewer-page h1 {
    font-size: 1.4rem;
    line-height: 1.3;
  }

  #slide-viewer-overlay .slide-viewer-page h2 {
    font-size: 1.1rem;
    line-height: 1.35;
    margin-bottom: 0.5em;
    padding-bottom: 0.2em;
  }

  #slide-viewer-overlay .slide-viewer-page h3 {
    font-size: 0.95rem;
  }

  #slide-viewer-overlay .slide-viewer-page p {
    font-size: 0.88rem;
    line-height: 1.7;
  }

  #slide-viewer-overlay .slide-viewer-page ul,
  #slide-viewer-overlay .slide-viewer-page ol {
    font-size: 0.86rem;
    line-height: 1.65;
    padding-left: 1em;
  }

  #slide-viewer-overlay .slide-viewer-page li {
    margin-bottom: 0.35em;
  }

  #slide-viewer-overlay .slide-viewer-page table {
    font-size: 0.72rem;
  }

  #slide-viewer-overlay .slide-viewer-page th {
    padding: 0.45em 0.55em;
    font-size: 0.65rem;
  }

  #slide-viewer-overlay .slide-viewer-page td {
    padding: 0.4em 0.55em;
  }

  #slide-viewer-overlay .slide-viewer-page blockquote {
    padding: 0.7rem 0.9rem;
    margin: 0.6em 0;
  }

  #slide-viewer-overlay .slide-viewer-page pre code {
    padding: 0.7em 0.9em;
    font-size: 0.75em;
  }

  #slide-viewer-overlay .slide-viewer-page img {
    max-width: 100%;
  }

  #slide-viewer-overlay .slide-viewer-page img[src$=".svg"] {
    max-width: 90%;
    padding: 0.6rem;
  }

  #slide-viewer-overlay .slide-inline-svg {
    width: min(92%, 640px);
    padding: 0.6rem;
  }

  /* Title slide — tighter on phones */
  #slide-viewer-overlay .slide-viewer-page.slide-title h2 {
    font-size: 1.4rem;
  }

  #slide-viewer-overlay .slide-viewer-page.slide-title p {
    max-width: 95%;
    font-size: 0.92rem;
  }

  /* Toolbar — stack vertically, compact */
  #slide-viewer-overlay .slide-viewer-toolbar {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }

  #slide-viewer-overlay .slide-viewer-meta {
    order: -1;
    padding: 0.45rem 0.75rem;
    border-radius: 12px;
  }

  #slide-viewer-overlay .slide-viewer-title {
    font-size: 0.82rem;
  }

  #slide-viewer-overlay .slide-viewer-nav {
    min-width: 0;
    padding: 0.4rem 0.7rem;
    font-size: 0.72rem;
  }

  /* Close button — easier to tap */
  .slide-viewer-close {
    top: 10px;
    right: 14px;
    width: 44px;
    height: 44px;
    font-size: 1.6rem;
  }

  .slide-viewer-fullscreen {
    right: 14px;
    bottom: 12px;
  }

  /* Visual slides */
  #slide-viewer-overlay .slide-viewer-page.slide-visual img {
    max-width: 100%;
    max-height: 45vh;
  }

  #slide-viewer-overlay .slide-viewer-page.slide-visual .slide-inline-svg {
    width: min(100%, 640px);
    padding: 0.75rem;
  }

  /* Entry slide */
  #slide-viewer-overlay .slide-viewer-page.slide-entry p {
    font-size: 0.84rem;
    line-height: 1.7;
  }

  #slide-viewer-overlay .slide-viewer-page.slide-entry strong {
    font-size: 0.72rem;
    padding: 0.1em 0.45em;
  }

  /* Table slide */
  #slide-viewer-overlay .slide-viewer-page.slide-table h2 {
    font-size: 1.05rem;
    margin-bottom: 0.4em;
  }

  /* Conclusion slide */
  #slide-viewer-overlay .slide-viewer-page.slide-conclusion li {
    font-size: 0.88rem;
    padding: 0.35em 0;
  }

  /* Overview slide — cards tighter */
  #slide-viewer-overlay .slide-viewer-page.slide-overview li {
    padding: 0.5em 0.8em;
    margin-bottom: 0.4em;
  }

  /* Scrollbar — thinner on phones */
  #slide-viewer-overlay .slide-content::-webkit-scrollbar {
    width: 6px;
  }
}

/* ==========================================================================
   Rich Slide Viewer (iframe mode)
   ========================================================================== */

/* When toolbar is hidden in rich mode, expand frame to fill the space */
#slide-viewer-overlay .slide-viewer-stage > iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: none;
  border-radius: inherit;
  background: var(--slide-bg-deep);
}