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+/* ===== Starlight Custom Styles ===== */
+
+/* ── Modern Color Theme ── */
+:root {
+  --sl-color-accent-low: #e0e7ff;
+  --sl-color-accent: #4f46e5;
+  --sl-color-accent-high: #3730a3;
+  --sl-color-bg-nav: #f8fafc;
+  --sl-color-bg: #ffffff;
+  --sl-color-text: #1e293b;
+  --sl-color-text-accent: #4f46e5;
+
+  /* MessageBubble — iMessage style */
+  --bubble-left-bg: #e9e9eb;
+  --bubble-left-bg-top: #f0f0f3;
+  --bubble-left-fg: #1c1c1e;
+  --bubble-right-bg: #0a84ff;
+  --bubble-right-bg-top: #1a8eff;
+  --bubble-right-fg: #ffffff;
+  --bubble-gityo-bg: #c8c4e8;
+  --highlight-bg: #e0e7ff;
+  --highlight-fg: #3730a3;
+
+  /* Dyslexia quote bubble — warm amber */
+  --bubble-dyslexia-bg: #fef3c7;
+  --bubble-dyslexia-bg-top: #fef9e7;
+  --bubble-dyslexia-fg: #1c1c1e;
+}
+
+:root[data-theme="dark"] {
+  --sl-color-accent-low: #1e1b4b;
+  --sl-color-accent: #818cf8;
+  --sl-color-accent-high: #a5b4fc;
+  --sl-color-bg-nav: #0f172a;
+  --sl-color-bg: #1e293b;
+  --sl-color-text: #e2e8f0;
+  --sl-color-text-accent: #a5b4fc;
+
+  /* MessageBubble dark */
+  --bubble-left-bg: #2c2c2e;
+  --bubble-left-bg-top: #38383a;
+  --bubble-left-fg: #e5e5ea;
+  --bubble-right-bg: #0a84ff;
+  --bubble-right-bg-top: #1a8eff;
+  --bubble-right-fg: #ffffff;
+  --bubble-gityo-bg: #3a3658;
+  --highlight-bg: #312e81;
+  --highlight-fg: #c7d2fe;
+
+  /* Dyslexia quote bubble dark */
+  --bubble-dyslexia-bg: #3d3520;
+  --bubble-dyslexia-bg-top: #4a3f28;
+  --bubble-dyslexia-fg: #fde68a;
+}
+
+/* ── Readable Typography ── */
+.sl-markdown-content {
+  line-height: 1.75;
+  color: var(--sl-color-text);
+}
+.sl-markdown-content p {
+  margin-bottom: 1em;
+}
+
+/* ── Stylish Headings ── */
+.sl-markdown-content h2 {
+  margin-top: 0.5em !important;
+  margin-bottom: 0.5em !important;
+}
+.sl-heading-wrapper.level-h2 {
+  margin-top: 0.5em !important;
+}
+.sl-markdown-content h3,
+.sl-markdown-content h4,
+.sl-markdown-content h5 {
+  font-weight: 600;
+  line-height: 1.4;
+  letter-spacing: 0.02em;
+}
+.sl-markdown-content h3 {
+  font-size: 1em;
+  margin-top: 1.2em;
+  margin-bottom: 0.3em;
+  padding-left: 0.6em;
+  border-left: 3px solid var(--sl-color-accent);
+  color: var(--sl-color-text);
+}
+.sl-markdown-content h4 {
+  font-size: 0.95em;
+  margin-top: 1em;
+  margin-bottom: 0.2em;
+  opacity: 0.8;
+}
+.sl-markdown-content h5 {
+  font-size: 0.9em;
+  margin-top: 1.2em;
+  opacity: 0.7;
+  text-transform: none;
+}
+
+/* ── Subtle Links ── */
+
+/* ── Stylish Tables ── */
+.sl-markdown-content table:not(:where(.not-content *)) {
+  display: table;
+  width: 100%;
+  border-collapse: separate;
+  border-spacing: 0;
+  margin: 1rem 0;
+  font-size: 0.9em;
+  overflow: hidden;
+  border-radius: 8px;
+  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
+}
+.sl-markdown-content thead th {
+  background: var(--sl-color-accent-low);
+  color: var(--sl-color-accent-high);
+  padding: 0.6rem 0.75rem;
+  text-align: left;
+  font-weight: 600;
+  font-size: 0.85em;
+  border-bottom: 2px solid var(--sl-color-accent);
+}
+.sl-markdown-content tbody td {
+  padding: 0.5rem 0.75rem;
+  border-bottom: 1px solid var(--sl-color-gray-5);
+  vertical-align: top;
+}
+.sl-markdown-content tbody tr:last-child td {
+  border-bottom: none;
+}
+.sl-markdown-content tbody tr:hover {
+  background: var(--sl-color-gray-5);
+}
+.sl-markdown-content tbody tr:nth-child(even) {
+  background: var(--sl-color-gray-6);
+}
+.sl-markdown-content tbody tr:nth-child(even):hover {
+  background: var(--sl-color-gray-5);
+}
+
+/* Tables inside bubbles */
+.bln table {
+  display: table !important;
+  width: 100%;
+  font-size: 0.88em;
+  border-radius: 6px;
+  background: var(--sl-color-bg);
+  border: 1px solid var(--sl-color-gray-5);
+  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
+  color: var(--sl-color-text);
+}
+.bln.bleft thead th {
+  background: var(--sl-color-gray-7);
+  color: var(--sl-color-text);
+  border-bottom: 2px solid var(--sl-color-gray-4);
+}
+.bln.bleft tbody td {
+  border-bottom: 1px solid var(--sl-color-gray-6);
+}
+.bln.bleft tbody tr:hover {
+  background: var(--sl-color-gray-6);
+}
+.bln.bleft tbody tr:nth-child(even) {
+  background: var(--sl-color-gray-7);
+}
+.bln.bright thead th {
+  background: var(--sl-color-gray-7);
+  color: var(--sl-color-text);
+  border-bottom: 2px solid var(--sl-color-gray-4);
+}
+.bln.bright tbody td {
+  border-bottom: 1px solid var(--sl-color-gray-6);
+}
+.bln.bright tbody tr:hover {
+  background: var(--sl-color-gray-6);
+}
+.bln.bright tbody tr:nth-child(even) {
+  background: var(--sl-color-gray-7);
+}
+
+/* Tables inside note asides */
+.starlight-aside--note table {
+  box-shadow: none;
+  border: 1px solid var(--sl-color-gray-5);
+  background: var(--sl-color-bg);
+  width: auto;
+  max-width: 100%;
+}
+.starlight-aside--note thead th {
+  background: var(--sl-color-gray-7);
+  color: var(--sl-color-text);
+  border-bottom-color: var(--sl-color-gray-4);
+}
+.starlight-aside--note tbody tr:nth-child(even) {
+  background: var(--sl-color-gray-7);
+}
+
+/* ── Subtle Links ── */
+.sl-markdown-content a {
+  text-decoration: none;
+}
+
+/* External link icon globally */
+.sl-markdown-content a[href^="http"]::after {
+  content: " ↗";
+  font-size: 0.75em;
+}
+
+/* Links inside bubbles */
+.bln a {
+  text-decoration: underline;
+  text-underline-offset: 3px;
+  text-decoration-thickness: 2px;
+  font-weight: 500;
+}
+.bln a[href^="/"]::before {
+  content: "🔗 ";
+  font-size: 0.85em;
+}
+.bln.bleft a {
+  color: #2563eb;
+  text-decoration-color: #93c5fd;
+}
+.bln.bleft a:hover {
+  background: rgba(37, 99, 235, 0.1);
+  border-radius: 2px;
+}
+.bln.bright a {
+  color: #e0f2fe;
+  text-decoration-color: rgba(255, 255, 255, 0.6);
+}
+.bln.bright a:hover {
+  background: rgba(255, 255, 255, 0.15);
+  border-radius: 2px;
+}
+
+/* ── Top fade effect (like iPhone) ── */
+
+/* Kaigiroku links spacing */
+#kaigiroku {
+  margin-bottom: 0.25rem !important;
+  display: flex;
+  gap: 0.5rem;
+  justify-content: flex-end;
+  flex-wrap: wrap;
+}
+#kaigiroku a[href^="http"]::after {
+  content: " ↗";
+  font-size: 0.8em;
+}
+
+/* Hide the overview link in TOC */
+
+/* ── Nicer note asides ── */
+.starlight-aside--note {
+  --sl-color-asides-text-accent: var(--sl-color-accent-high);
+  --sl-color-asides-border: var(--sl-color-accent);
+  background: var(--sl-color-accent-low);
+  border-radius: 6px;
+  padding: 0.75rem 1rem;
+  margin: 0.75rem 0;
+  font-size: 0.95em;
+  border: none;
+  box-shadow: 2px 3px 8px rgba(0, 0, 0, 0.06);
+  position: relative;
+}
+.starlight-aside--note::before {
+  content: "";
+  position: absolute;
+  top: -4px;
+  right: 20px;
+  width: 32px;
+  height: 8px;
+  background: var(--sl-color-accent);
+  border-radius: 2px;
+  opacity: 0.5;
+}
+.starlight-aside--note .starlight-aside__title {
+  font-size: 0.9em;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+  opacity: 0.7;
+  margin-bottom: 0.25rem;
+}
+
+.starlight-aside--tip {
+  --sl-color-asides-text-accent: #065f46;
+  --sl-color-asides-border: #10b981;
+  background: #ecfdf5;
+  border-radius: 6px;
+  padding: 0.75rem 1rem;
+  margin: 0.75rem 0;
+  font-size: 0.95em;
+  border: none;
+  box-shadow: 2px 3px 8px rgba(0, 0, 0, 0.06);
+  position: relative;
+}
+.starlight-aside--tip::before {
+  content: "";
+  position: absolute;
+  top: -4px;
+  right: 20px;
+  width: 32px;
+  height: 8px;
+  background: #10b981;
+  border-radius: 2px;
+  opacity: 0.5;
+}
+:root[data-theme="dark"] .starlight-aside--tip {
+  --sl-color-asides-text-accent: #6ee7b7;
+  --sl-color-asides-border: #059669;
+  background: #022c22;
+}
+:root[data-theme="dark"] .starlight-aside--tip::before {
+  background: #059669;
+}
+
+main::before {
+  content: "";
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  height: 6rem;
+  background: linear-gradient(180deg, var(--sl-color-bg) 0%, transparent 100%);
+  pointer-events: none;
+  z-index: 10;
+}
+
+/* ── Text Justification ── */
+p,
+.sl-sidebar a,
+#starlight__sidebar a {
+  text-align: justify;
+}
+
+/* ── Admonition title inline ── */
+.sl-banner .title,
+aside .title {
+  display: inline;
+}
+
+/* ── Mermaid centering ── */
+.mermaid-container {
+  text-align: center;
+}
+
+/* Mermaid diagram support */
+/* Mermaid centering */
+.sl-markdown-content p:has(> svg) {
+  text-align: center !important;
+}
+
+/* ── Video container ── */
+.video-container {
+  position: relative;
+  width: 100%;
+  max-width: 560px;
+  margin: 0 auto;
+}
+.video-container iframe {
+  width: 100%;
+  aspect-ratio: 16 / 9;
+}
+
+/* ── Hero subtitle center ── */
+.hero__subtitle {
+  text-align: center;
+}
+
+/* ── PDF iframe ── */
+.tukokusyo {
+  width: 100%;
+  height: 700px;
+  border: 1px solid var(--sl-color-gray-5);
+  border-radius: 6px;
+}
+
+@media screen and (max-width: 996px) {
+  .tukokusyo {
+    width: 100%;
+    height: 400px;
+    touch-action: pan-y;
+  }
+}
+
+/* ── General question anchor separator ── */
+#situgi {
+  display: flex;
+  flex-direction: column;
+}
+
+#situgi > .anchor {
+  margin-top: 20px;
+  border-bottom: 1px dashed;
+  padding-bottom: 20px;
+}
+
+/* ══════════════════════════════════════
+   MessageBubble (Speech Bubble)
+   ══════════════════════════════════════ */
+.bln {
+  border-radius: 1rem;
+  position: relative;
+  padding: 0.375rem 1rem;
+  max-width: 88%;
+  font-size: 1rem;
+  letter-spacing: normal;
+  line-height: 1.6;
+}
+
+/* Multi-element bubbles get more padding */
+.bln:has(> :nth-child(3)) {
+  padding-top: 0.75rem;
+  padding-bottom: 0.75rem;
+}
+
+.bln.bleft {
+  background: linear-gradient(
+    180deg,
+    var(--bubble-left-bg-top) 0%,
+    var(--bubble-left-bg) 100%
+  );
+  color: var(--bubble-left-fg);
+  margin: 1.2rem auto 0.6rem 4%;
+}
+
+.bln.bleft.gityo {
+  background: linear-gradient(180deg, #e0ddf5 0%, var(--bubble-gityo-bg) 100%);
+}
+
+.bln.bleft.dyslexia {
+  background: linear-gradient(
+    180deg,
+    var(--bubble-dyslexia-bg-top) 0%,
+    var(--bubble-dyslexia-bg) 100%
+  );
+  color: var(--bubble-dyslexia-fg);
+  max-width: 92%;
+  font-size: 1.05rem;
+  line-height: 1.8;
+  letter-spacing: 0.02em;
+}
+
+.bln.bleft.dyslexia .tail-outer {
+  border-color: transparent var(--bubble-dyslexia-bg) transparent transparent;
+}
+
+.bln.bright {
+  background: linear-gradient(
+    180deg,
+    var(--bubble-right-bg-top) 0%,
+    var(--bubble-right-bg) 100%
+  );
+  color: var(--bubble-right-fg);
+  margin: 1.2rem 4% 0.6rem auto;
+}
+
+/* Remove outline approach */
+.bln-inner {
+  all: unset;
+}
+.tail-inner {
+  display: none !important;
+}
+
+/* Bubble tail — outer (colored) */
+.tail-outer {
+  display: block;
+  position: absolute;
+  width: 0;
+  height: 0;
+  border-style: solid;
+  bottom: 2px;
+}
+
+.bln.bleft .tail-outer {
+  border-color: transparent var(--bubble-left-bg) transparent transparent;
+  border-width: 8px 22px 6px 0;
+  left: -16px;
+  rotate: -35deg;
+}
+
+.bln.bleft.gityo .tail-outer {
+  border-color: transparent var(--bubble-gityo-bg) transparent transparent;
+}
+
+.bln.bright .tail-outer {
+  border-color: transparent transparent transparent var(--bubble-right-bg);
+  border-width: 8px 0 6px 22px;
+  right: -16px;
+  rotate: 40deg;
+}
+
+/* Bubble tail — inner (page background) */
+.tail-inner {
+  display: block;
+  position: absolute;
+  width: 0;
+  height: 0;
+  border-style: solid;
+  bottom: 3px;
+}
+
+.bln.bleft .tail-inner {
+  border-color: transparent var(--sl-color-bg) transparent transparent;
+  border-width: 6px 18px 4px 0;
+  left: -13px;
+  rotate: -40deg;
+}
+
+.bln.bright .tail-inner {
+  border-color: transparent transparent transparent var(--sl-color-bg);
+  border-width: 6px 0 4px 18px;
+  right: -14px;
+  rotate: 40deg;
+}
+
+/* Speaker label — subtle */
+.bln::after {
+  color: var(--sl-color-gray-3);
+  content: attr(data-speaker);
+  position: absolute;
+  font-size: 0.7rem;
+  top: -1.1rem;
+  white-space: nowrap;
+}
+
+.bln.bleft::after {
+  left: 0.5rem;
+}
+
+.bln.bright::after {
+  right: 0.5rem;
+  text-align: right;
+}
+
+/* Bubble inner paragraphs */
+.bln > p:not(:last-child) {
+  margin-top: 0;
+}
+
+.bln > p:last-child {
+  margin: 0;
+}
+
+/* Bubble emotion variants */
+.bln.bleft.thought,
+.bln.bleft.smile,
+.bln.bleft.weary,
+.bln.bleft.anger,
+.bln.bleft.sorry,
+.bln.bleft.search {
+  border: 6px dotted var(--bubble-left-fg);
+  background-color: unset;
+}
+
+.bln.bleft.thought::before,
+.bln.bleft.smile::before,
+.bln.bleft.weary::before,
+.bln.bleft.anger::before,
+.bln.bleft.sorry::before,
+.bln.bleft.search::before {
+  border-width: 0;
+  content: "🤔";
+  left: -2.5rem;
+  top: 0;
+}
+
+.bln.bleft.smile::before {
+  content: "🙂";
+}
+.bln.bleft.weary::before {
+  content: "😩";
+}
+.bln.bleft.anger::before {
+  content: "💢";
+}
+.bln.bleft.sorry::before {
+  content: "🙏";
+}
+.bln.bleft.search::before {
+  content: "🔍";
+}
+
+@media only screen and (min-width: 800px) {
+  .bln {
+    max-width: 66%;
+  }
+  .bln.bleft.thought::before,
+  .bln.bleft.smile::before,
+  .bln.bleft.weary::before,
+  .bln.bleft.anger::before,
+  .bln.bleft.sorry::before,
+  .bln.bleft.search::before {
+    left: -3rem;
+  }
+}
+
+/* ── BlockQuote (cool sticky note) ── */
+.qt {
+  position: relative;
+  background: linear-gradient(135deg, #fef9e7 0%, #fef3c7 100%);
+  border: 1px solid #fcd34d;
+  border-radius: 4px;
+  padding: 18px 20px 20px;
+  margin: 1rem 6%;
+  color: #78350f;
+  box-shadow: 2px 3px 8px rgba(0, 0, 0, 0.06);
+}
+
+:root[data-theme="dark"] .qt {
+  background: linear-gradient(135deg, #2a1e00 0%, #1a1400 100%);
+  border-color: #854d00;
+  color: #fcd34d;
+  box-shadow: 2px 3px 8px rgba(0, 0, 0, 0.2);
+}
+
+.qt::before {
+  content: "";
+  position: absolute;
+  top: -6px;
+  left: 16px;
+  width: 40px;
+  height: 10px;
+  background: #d97706;
+  border-radius: 2px;
+  opacity: 0.6;
+}
+
+.qt cite {
+  font-weight: 600;
+  display: block;
+  font-style: normal;
+  margin-bottom: 0.5rem;
+  font-size: 0.95em;
+  color: inherit;
+}
+
+.bln .qt a {
+  color: #92400e;
+  text-decoration-color: #b45309;
+}
+
+:root[data-theme="dark"] .bln .qt a {
+  color: #fbbf24;
+  text-decoration-color: #f59e0b;
+}
+
+/* ══════════════════════════════════════
+   Highlight
+   ══════════════════════════════════════ */
+.highlight-span {
+  background-color: var(--highlight-bg);
+  color: var(--highlight-fg);
+  border-bottom: 1px dotted var(--highlight-fg);
+}
+
+/* ══════════════════════════════════════
+   Site Guide (home page nav cards)
+   ══════════════════════════════════════ */
+
+/* ── Homepage Hero Banner (Salient-inspired) ── */
+
+/* Remove default Starlight page title and extra whitespace on home */
+main:has(.home-hero) > .content-panel:first-child {
+  display: none;
+}
+main:has(.home-hero) {
+  padding-top: 0;
+}
+.main-frame:has(.home-hero) {
+  padding-top: 0;
+}
+
+/* Hide right sidebar (TOC) on home page — mobile only */
+@media (max-width: 799px) {
+  /* Collapse right sidebar entirely */
+  .sl-flex:has(.home-hero) .right-sidebar-container {
+    display: none;
+  }
+  .sl-flex:has(.home-hero) .right-sidebar {
+    display: none;
+  }
+  /* Make content full width */
+  .sl-flex:has(.home-hero) {
+    grid-template-columns: 100%;
+  }
+  .sl-flex:has(.home-hero) .main-pane {
+    width: 100%;
+    max-width: 100%;
+  }
+}
+
+/* Change TOC "Back to top" text */
+[href="#_top"]:not([class*="skip"]) span {
+  display: none;
+}
+[href="#_top"]:not([class*="skip"])::after {
+  content: "ページ上部へ";
+  font-size: 0.875rem;
+}
+
+.sl-container:has(.home-hero) .hero,
+.content-panel:has(.home-hero) > .sl-container {
+  padding-top: 0;
+}
+.content-panel:has(.home-hero) {
+  padding-top: 0 !important;
+}
+.content-panel:has(.home-hero) {
+  overflow-x: clip;
+}
+.home-hero {
+  position: relative;
+  margin: 3.5rem calc(-50vw + 50%) 3rem calc(-50vw + 50%);
+  padding: 6rem 1rem 5rem 8%;
+  background: url("/img/mini_yasutake-yohei_15.jpg") top center/auto 110%
+    no-repeat;
+  text-align: left;
+  color: #fff;
+  min-height: 320px;
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: flex-start;
+}
+.home-hero::before {
+  content: "";
+  position: absolute;
+  inset: 0;
+  background: none;
+}
+.home-hero > * {
+  position: relative;
+  z-index: 1;
+}
+.home-hero h1 {
+  font-size: 1.8rem;
+  font-weight: 700;
+  color: #fff;
+  margin: 0 0 0.5rem;
+  line-height: 1.5;
+}
+.home-hero h1 .line {
+  display: block;
+}
+.home-hero .hero-sub {
+  font-size: 0.95rem;
+  color: #fff;
+  opacity: 0.9;
+}
+
+/* ── Profile intro: photo + message (two-column) ── */
+.home-intro {
+  margin: 5rem 0 6rem;
+}
+.home-intro .intro-head h2 {
+  margin-top: 0 !important;
+  margin-bottom: 1rem;
+  line-height: 1.6;
+  text-align: center;
+}
+.home-intro .intro-photo {
+  text-align: center;
+  margin: 0 auto 1rem;
+}
+.home-intro .intro-photo img {
+  display: inline;
+  width: 200px;
+  max-width: 60%;
+  border-radius: 12px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
+}
+.home-intro .photo-caption {
+  margin: 0.4rem 0 0;
+  font-size: 0.85rem;
+  color: var(--sl-color-gray-2);
+  text-align: center;
+}
+.home-intro .intro-text > p:first-child {
+  margin-top: 0 !important;
+}
+
+@media screen and (min-width: 768px) {
+  .home-intro {
+    display: grid;
+    grid-template-columns: 220px 1fr;
+    gap: 1.5rem;
+    row-gap: 0.5rem;
+    align-items: center;
+  }
+  .home-intro .intro-head,
+  .home-intro .intro-cta {
+    grid-column: 1 / -1;
+    text-align: center;
+  }
+  .home-intro .intro-photo img {
+    width: 100%;
+  }
+}
+
+/* ── Separator with label ── */
+.home-sep {
+  display: flex;
+  align-items: center;
+  gap: 1rem;
+  margin: 2.5rem 0 2rem;
+}
+.home-sep::before,
+.home-sep::after {
+  content: "";
+  flex: 1;
+  border-top: 1px solid #aaa;
+}
+.home-sep span {
+  font-size: 0.85rem;
+  color: #888;
+  font-weight: 600;
+}
+
+@media screen and (min-width: 768px) {
+  .home-hero {
+    margin: 3.5rem 0 2rem 0;
+    padding: 6rem 2rem 4rem 3rem;
+  }
+  .home-hero h1 {
+    font-size: 2.5rem;
+  }
+}
+
+/* ══════════════════════════════════════
+   Top bar: cleaner site title
+   ══════════════════════════════════════ */
+
+/* ── Jisseki page: achievement item images ── */
+.achievement-card {
+  display: flex;
+  gap: 1rem;
+  align-items: flex-start;
+  background: var(--sl-color-gray-6);
+  border-radius: 10px;
+  padding: 1rem;
+  margin-bottom: 1rem;
+}
+.achievement-card .achievement-img {
+  flex-shrink: 0;
+  width: 160px;
+  height: 110px;
+  object-fit: cover;
+  border-radius: 6px;
+}
+.achievement-card .achievement-body {
+  flex: 1;
+  min-width: 0;
+}
+.achievement-card .achievement-body p {
+  margin: 0.25rem 0 0;
+  font-size: 0.9rem;
+}
+
+@media screen and (max-width: 600px) {
+  .achievement-card {
+    flex-direction: column;
+  }
+  .achievement-card .achievement-img {
+    width: 100%;
+    height: 140px;
+  }
+}
+
+/* Activity grid on home page */
+.activity-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
+  gap: 1rem;
+  margin: 1.5rem 0;
+}
+.activity-card {
+  position: relative;
+  border-radius: 8px;
+  overflow: hidden;
+  aspect-ratio: 4/3;
+  display: block;
+  transition:
+    transform 0.2s,
+    box-shadow 0.2s;
+  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
+}
+.activity-card:hover {
+  transform: translateY(-2px);
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.18);
+}
+.activity-card img {
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+}
+.activity-card .activity-title {
+  position: absolute;
+  top: 0;
+  left: 0;
+  right: 0;
+  padding: 0.4rem 0.5rem;
+  background: rgba(0, 0, 0, 0.6);
+  color: white;
+  font-size: 0.8rem;
+  font-weight: 700;
+  text-align: center;
+  line-height: 1.3;
+  z-index: 1;
+}
+
+.site-title {
+  font-size: 1.05rem;
+  font-weight: 500;
+  letter-spacing: 0.02em;
+}
+.sl-markdown-content h2:has(+ .site-guide) {
+  font-size: 0.9rem !important;
+}
+.guide-btn {
+  display: inline-block;
+  padding: 0.4rem 1.2rem;
+  background: var(--sl-color-accent);
+  color: #fff !important;
+  border-radius: 6px;
+  font-weight: 500;
+  font-size: 0.9rem;
+  transition: background 0.2s;
+}
+.guide-btn:hover {
+  background: var(--sl-color-accent-high);
+  color: #fff !important;
+}
+
+/* ── Site guide icon cards ── */
+.site-guide {
+  display: grid;
+  grid-template-columns: repeat(3, 120px);
+  gap: 0.5rem;
+  margin: 2rem 0 1rem;
+  justify-content: center;
+}
+.site-guide a {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 0.3rem;
+  padding: 0.75rem 0.5rem;
+  border-radius: 8px;
+  background: var(--sl-color-gray-6);
+  text-decoration: none;
+  text-align: center;
+  font-size: 0.85rem;
+  font-weight: 500;
+  color: var(--sl-color-text);
+  transition: background 0.2s;
+}
+.site-guide a:hover {
+  background: var(--sl-color-accent-low);
+}
+.site-guide .icon {
+  font-size: 1.4rem;
+  line-height: 1;
+}
+.site-guide .label {
+  line-height: 1.3;
+}
+.intro-cta {
+  text-align: center;
+  margin-top: 1.5rem;
+}
+
+/* ══════════════════════════════════════
+   External Link Icon
+   ══════════════════════════════════════ */
+
+/* ── Hide empty profile table header ── */
+.sl-markdown-content thead:has(th:empty) {
+  display: none;
+}
+
+/* ── Center and space 市政への思い, 活動 headings ── */
+.profile-detail ~ h2,
+.profile-detail ~ .sl-heading-wrapper.level-h2 {
+  text-align: center !important;
+  margin-top: 8rem !important;
+  margin-bottom: 2rem !important;
+}
+
+/* ── Profile detail headings: smaller, centered ── */
+.profile-detail .sl-heading-wrapper {
+  text-align: center !important;
+  margin-top: 3rem !important;
+  margin-bottom: 4rem !important;
+}
+.profile-detail h3 {
+  font-size: 0.85em !important;
+  text-align: center !important;
+  border-left: none !important;
+  padding-left: 0 !important;
+}
+
+/* ── Profile detail: more space between photo and caption ── */
+.profile-detail figcaption {
+  margin-top: 0.8rem !important;
+}
+.profile-detail figure {
+  margin-bottom: 2rem !important;
+}
+
+/* Hide heading anchor links on home page */
+.sl-markdown-content:has(.home-hero) .sl-anchor-link {
+  display: none;
+}
+.profile-table {
+  margin-top: 1.5rem;
+}
+.profile-table table {
+  box-shadow: none !important;
+  border-radius: 0 !important;
+  border: none !important;
+}
+.profile-table table tbody td {
+  padding: 1rem 0.5rem;
+  border-bottom: 1px solid var(--sl-color-gray-5);
+  vertical-align: middle;
+}
+.profile-table table tbody td:last-child {
+  white-space: normal;
+}
+.profile-table table tbody td:first-child {
+  white-space: nowrap;
+}
+.profile-table table tbody tr:nth-child(even) {
+  background: transparent;
+}
+.profile-table table tbody tr:hover {
+  background: var(--sl-color-gray-5);
+}
+.ext-link-icon {
+  display: inline-block;
+  margin-left: 0.15em;
+  font-size: 0.75em;
+  vertical-align: super;
+}