/* ============================================
   Design tokens
   ============================================ */
:root {
  --ink: #2a2a2a;
  --ink-strong: #111111;
  --sub: #555555;
  --muted: #8f8f8f;
  --faint: #c7c7c7;
  --bg: #ffffff;
  --hover: #f3f3f3;
  --callout: #f5f5f5;
  --line: #e5e5e5;
  --hair: #ececec;
  --accent: #555555;
  --sans: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Inter", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic Medium", "Yu Gothic", "Noto Sans JP", sans-serif;
  --mono: "SFMono-Regular", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e4e4e4;
    --ink-strong: #f5f5f5;
    --sub: #a8a8a8;
    --muted: #787878;
    --faint: #4a4a4a;
    --bg: #121212;
    --hover: #1e1e1e;
    --callout: #1c1c1c;
    --line: #2a2a2a;
    --hair: #232323;
    --accent: #a8a8a8;
  }
}

/* ============================================
   Base
   ============================================ */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  font-size: 14.5px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 32px 0;
}
::selection { background: var(--callout); }

/* ============================================
   Topbar
   ============================================ */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 820px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 11.5px;
  letter-spacing: 0.02em;
}
.topbar a { text-decoration: none; color: var(--sub); }
.topbar a:hover { color: var(--ink-strong); }
.topbar .brand {
  font-family: var(--mono);
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.topbar .crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
}
.topbar .crumb .sep { color: var(--faint); }
.topbar .crumb .now { color: var(--ink); font-weight: 500; }

/* ============================================
   Language toggle
   ============================================ */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 2px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}
.lang-toggle a {
  padding: 4px 8px;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s;
}
.lang-toggle a:hover { color: var(--ink-strong); }
.lang-toggle a[aria-current="page"] { color: var(--ink-strong); }
.lang-toggle .sep { color: var(--faint); padding: 0 2px; }

/* ============================================
   Button
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 20px;
  background: var(--ink-strong);
  color: var(--bg);
  text-decoration: none;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid var(--ink-strong);
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.btn:hover { background: transparent; color: var(--ink-strong); }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; }
.btn .arrow { font-family: var(--mono); }
.btn.ghost {
  background: transparent;
  color: var(--sub);
  border-color: var(--line);
}
.btn.ghost:hover {
  background: transparent;
  color: var(--ink-strong);
  border-color: var(--ink-strong);
}

/* ============================================
   Profile (home) page
   ============================================ */
main.home {
  max-width: 820px;
  margin: 0 auto;
  padding: 56px 24px 120px;
}
main.home .profile {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  filter: grayscale(1);
  margin: 0 0 24px;
}
main.home h1 {
  font-size: clamp(26px, 3.8vw, 36px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
  color: var(--ink-strong);
}
main.home .romaji {
  font-family: var(--mono);
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 28px;
}
main.home .bio {
  margin: 0 0 28px;
  line-height: 1.85;
  color: var(--ink);
}
main.home .bio p + p { margin-top: 1em; }
main.home .contact-cta {
  margin: 0 0 40px;
  text-align: left;
}
main.home section {
  padding: 20px 0;
  border-top: 1px solid var(--line);
}
main.home section:last-of-type { border-bottom: 1px solid var(--line); }
main.home section h2 {
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 8px;
}
main.home section a {
  color: var(--ink-strong);
  text-decoration: none;
  border-bottom: 1px solid var(--faint);
  transition: border-color 0.15s, color 0.15s;
}
main.home section a:hover { border-color: var(--ink-strong); }
main.home section a .arrow {
  font-family: var(--mono);
  color: var(--muted);
  margin-left: 2px;
}
main.home .svc-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 4px;
}
main.home .svc-card {
  display: block;
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: 6px;
  text-decoration: none;
  background: var(--bg);
  transition: border-color 0.15s, background 0.15s;
}
main.home .svc-card:hover {
  border-color: var(--ink-strong);
  background: var(--hover);
}
main.home .svc-card h3 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink-strong);
}
main.home .svc-card h3 .arrow {
  font-family: var(--mono);
  color: var(--muted);
  margin-left: 2px;
  font-weight: 400;
}
main.home .svc-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--sub);
}
@media (max-width: 560px) {
  main.home .svc-grid { grid-template-columns: 1fr; }
}
main.home .notes {
  line-height: 1.85;
}
main.home .notes li + li { margin-top: 4px; }
main.home .tz {
  color: var(--muted);
  font-size: 12px;
  margin-left: 4px;
}
main.home > footer {
  margin-top: 40px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
  text-transform: uppercase;
}

/* ============================================
   Document page (cs-cart / long-form)
   ============================================ */
main.doc {
  max-width: 820px;
  margin: 0 auto;
  padding: 56px 24px 120px;
}
main.doc h1 {
  font-size: clamp(26px, 3.8vw, 36px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
  color: var(--ink-strong);
}
main.doc .subtitle {
  font-size: 15px;
  color: var(--sub);
  font-weight: 500;
  margin: 0 0 28px;
}
main.doc h2 {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.005em;
  margin: 44px 0 10px;
  color: var(--ink-strong);
  scroll-margin-top: 80px;
}
main.doc h3 {
  font-size: 15px;
  font-weight: 600;
  margin: 0;
  color: var(--ink-strong);
}
main.doc p {
  margin: 10px 0;
  color: var(--ink);
  line-height: 1.85;
}
main.doc p.dim { color: var(--sub); }
main.doc b, main.doc strong { font-weight: 600; color: var(--ink-strong); }

main.doc section { margin: 40px 0 0; }
main.doc section > h2 { margin: 0 0 14px; }
main.doc section > .sec-body { padding: 0; }

/* Bullets, numbered list */
ul.bullets, ol.numbered {
  margin: 10px 0;
  padding: 0;
}
ul.bullets li, ol.numbered li {
  padding: 4px 0 4px 28px;
  position: relative;
  color: var(--ink);
  line-height: 1.8;
}
ul.bullets li::before {
  content: "";
  position: absolute;
  left: 8px; top: 16px;
  width: 5px; height: 5px;
  background: var(--ink);
}
ol.numbered { counter-reset: n; }
ol.numbered > li {
  counter-increment: n;
  padding-left: 32px;
}
ol.numbered > li::before {
  content: counter(n, decimal-leading-zero);
  position: absolute;
  left: 0; top: 4px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* Disclosure toggle */
details.tog { margin: 2px 0; padding: 0; }
details.tog > summary {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  cursor: pointer;
  list-style: none;
  padding: 6px 8px 6px 4px;
  margin-left: -4px;
  transition: background 0.1s;
  color: var(--ink-strong);
  font-weight: 600;
  line-height: 1.6;
}
details.tog > summary::-webkit-details-marker { display: none; }
details.tog > summary:hover { background: var(--hover); }
details.tog > summary::before {
  content: "";
  width: 10px;
  height: 10px;
  margin-top: 9px;
  flex-shrink: 0;
  background: var(--muted);
  clip-path: polygon(25% 12%, 25% 88%, 82% 50%);
  transition: transform 0.15s ease;
  transform-origin: 50% 50%;
}
details.tog > summary:hover::before { background: var(--ink-strong); }
details.tog[open] > summary::before { transform: rotate(90deg); }
details.tog > .body {
  padding: 4px 0 12px 26px;
  border-left: 1px solid var(--line);
  margin-left: 9px;
  margin-top: 2px;
}
details.tog > .body > p:first-child { margin-top: 2px; }
details.tog > .body > :last-child { margin-bottom: 0; }
details.tog.h3 > summary {
  font-size: 14.5px;
  font-weight: 600;
  padding: 6px 10px 6px 4px;
}
details.tog.h3 > .body { padding: 4px 0 10px 26px; }

/* Callout */
.callout {
  background: var(--callout);
  padding: 14px 18px;
  margin: 14px 0;
  border-left: 3px solid var(--accent);
  color: var(--ink);
  font-size: 13.5px;
  line-height: 1.8;
}
.callout b { color: var(--ink-strong); }
.callout p + p { margin-top: 0.5em; }
.callout.quote { font-style: normal; }
.callout.quote ul li { padding: 2px 0; }
.callout.quote ul li::before { content: "「"; color: var(--muted); }
.callout.quote ul li::after { content: "」"; color: var(--muted); }

/* Inline tag chips */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 6px;
  margin: 10px 0;
}
.tags li {
  padding: 2px 10px;
  font-size: 12px;
  color: var(--ink);
  background: var(--hover);
}

/* Meta box */
.meta {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 6px 16px;
  margin: 24px 0;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  font-size: 13px;
}
.meta dt { color: var(--muted); font-size: 12px; }
.meta dd { margin: 0; color: var(--ink); font-weight: 500; }

/* CTA block used in doc pages */
.cta-block {
  margin: 28px 0 8px;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  align-items: center;
}
.cta-note { font-size: 11.5px; color: var(--muted); }

/* Helpers */
.small { font-size: 13px; color: var(--sub); }
.tight-top { margin-top: 6px; }
.cta-tight { margin-top: 8px; }
.label-mono {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
  text-transform: uppercase;
}
.kbd {
  font-family: var(--mono);
  font-size: 12px;
  padding: 1px 6px;
  background: var(--hover);
  color: var(--ink);
}

footer.site-foot {
  max-width: 820px;
  margin: 0 auto;
  padding: 24px;
  border-top: 1px solid var(--line);
  font-size: 11.5px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  letter-spacing: 0.02em;
}
footer.site-foot a { color: var(--muted); text-decoration: none; }
footer.site-foot a:hover { color: var(--ink-strong); }

/* ============================================
   Modal — contact form
   ============================================ */
dialog.modal {
  border: none;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  max-width: 520px;
  width: calc(100% - 32px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
  opacity: 0;
  transform: translateY(8px) scale(0.98);
  transition: opacity 0.22s ease, transform 0.22s ease,
              overlay 0.22s ease allow-discrete,
              display 0.22s ease allow-discrete;
}
dialog.modal[open] {
  opacity: 1;
  transform: translateY(0) scale(1);
}
@starting-style {
  dialog.modal[open] {
    opacity: 0;
    transform: translateY(8px) scale(0.98);
  }
}
dialog.modal::backdrop {
  background: rgba(0, 0, 0, 0);
  backdrop-filter: blur(0);
  transition: background 0.22s ease, backdrop-filter 0.22s ease,
              overlay 0.22s ease allow-discrete,
              display 0.22s ease allow-discrete;
}
dialog.modal[open]::backdrop {
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(4px);
}
@starting-style {
  dialog.modal[open]::backdrop {
    background: rgba(0, 0, 0, 0);
    backdrop-filter: blur(0);
  }
}
.modal-inner { padding: 32px 28px 28px; }
.modal-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}
.modal-head h2 {
  font-family: var(--sans);
  font-size: 16px;
  margin: 0;
  color: var(--ink-strong);
  text-transform: none;
  letter-spacing: -0.005em;
  font-weight: 600;
}
.modal-close {
  background: none;
  border: none;
  padding: 4px 8px;
  cursor: pointer;
  color: var(--muted);
  font-size: 20px;
  line-height: 1;
}
.modal-close:hover { color: var(--ink-strong); }

/* Form */
.field { margin-bottom: 16px; }
.field label {
  display: block;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 6px;
}
.field input,
.field textarea {
  width: 100%;
  padding: 10px 12px;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 0;
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.6;
  outline: none;
  transition: border-color 0.15s;
}
.field input:focus,
.field textarea:focus { border-color: var(--ink-strong); }
.field textarea { resize: vertical; min-height: 120px; }
.form-actions { margin-top: 20px; text-align: left; }
.form-status {
  font-size: 12px;
  color: var(--muted);
  margin-top: 12px;
  min-height: 1.2em;
}
.form-status.error { color: #c0392b; }
.form-note {
  font-size: 11.5px;
  color: var(--muted);
  line-height: 1.75;
  margin-top: 14px;
}
.form-success {
  text-align: left;
  padding: 20px 0 4px;
}
.form-success p { margin-bottom: 16px; font-size: 14.5px; line-height: 1.85; }
.form-body, .form-success {
  opacity: 1;
  transition: opacity 0.22s ease, display 0.22s ease allow-discrete;
}
.form-body[hidden], .form-success[hidden] {
  display: none;
  opacity: 0;
}
@starting-style {
  .form-body:not([hidden]), .form-success:not([hidden]) {
    opacity: 0;
  }
}