:root {
  --canvas: #0b0b0d;
  --surface-1: #131317;
  --surface-2: #1b1c21;
  --ink: #f2f3f5;
  --ink-muted: #a7acb6;
  --ink-subtle: #8b8f9a;    
  --hairline: #26272d;
  --hairline-soft: #1e1f24;
   
  --accent: #ff6a1a;
  --accent-strong: #ff7a33;
  --accent-text: #ffa066;
  --accent-ink: #1c0d04;
  --inverse-canvas: #f6f2ec;
  --inverse-ink: #17150f;
  --error: #ff7a70;
  --success: #4fd08a;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --maxw: 1080px;
}

 
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans",
    "Noto Sans JP", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
 
[hidden] { display: none !important; }

img { max-width: 100%; height: auto; }
a { color: inherit; }
::selection { background: rgba(255, 106, 26, 0.35); }
:focus-visible {
  outline: 3px solid var(--accent-strong);
  outline-offset: 2px;
  border-radius: 4px;
}

 
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

 
.skip-link {
  position: absolute;
  left: 8px; top: -48px;
  z-index: 100;
  background: var(--ink);
  color: var(--canvas);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: top 0.15s ease;
}
.skip-link:focus { top: 8px; }

 
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
section { padding: 88px 0 0; scroll-margin-top: 64px; }  
section:last-of-type { padding-bottom: 88px; }

 
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--canvas) 86%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--hairline-soft);
}
.site-header .container {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 56px;
}
.brand {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
  text-decoration: none;
  user-select: none;  
}
.brand .dot { color: var(--accent); }
 
#site-title { user-select: none; }
.site-nav { margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap; }
.site-nav a {
  text-decoration: none;
  color: var(--ink-muted);
  font-size: 14px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
}
.site-nav a:hover { color: var(--ink); background: var(--surface-2); }

 
.btn {
  display: inline-block;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 10px 18px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
}
 
.btn-primary { background: var(--ink); color: var(--canvas); }
.btn-primary:hover { background: #ffffff; }
.btn-secondary { background: var(--surface-1); color: var(--ink); border-color: var(--hairline); }
.btn-secondary:hover { background: var(--surface-2); }
.btn-accent { background: var(--accent-strong); color: var(--accent-ink); }
.btn-accent:hover { background: var(--accent); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }

 
.hero {
  padding: 104px 0 8px;
  background:
    radial-gradient(820px 380px at 12% -12%, rgba(255, 106, 26, 0.16), transparent 68%),
    radial-gradient(640px 320px at 88% -18%, rgba(255, 106, 26, 0.07), transparent 70%);
}
.hero h1 {
  font-size: clamp(36px, 6.4vw, 68px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.035em;
  margin: 0 0 20px;
}
.hero .lead {
  font-size: 18px;
  color: var(--ink-muted);
  max-width: 640px;
  margin: 0 0 28px;
}
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-note { font-size: 13px; color: var(--ink-subtle); margin-top: 16px; }

 
.public-notice {
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-left: 4px solid var(--accent-strong);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 14px;
  color: var(--ink);
  max-width: 640px;
  margin: 0 0 24px;
}

 
.eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent-text);
  margin: 0 0 8px;
}
h2 {
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}
.section-lead { color: var(--ink-muted); max-width: 680px; margin: 0 0 32px; }
h3 { font-size: 19px; font-weight: 700; margin: 28px 0 8px; }

 
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.card {
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 24px;
}
.card h3 { margin-top: 0; font-size: 17px; }
.card p { margin: 0; font-size: 14px; color: var(--ink-muted); }
.card .icon {
  display: inline-flex;
  width: 36px; height: 36px;
  align-items: center; justify-content: center;
  background: var(--surface-2);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  font-size: 18px;
}

 
.steps { counter-reset: step; display: grid; gap: 12px; }
.step {
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 20px 24px 20px 64px;
  position: relative;
}
.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 20px; top: 20px;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--canvas);
  font-weight: 700;
  font-size: 14px;
  display: flex; align-items: center; justify-content: center;
}
.step h3 { margin: 0 0 6px; font-size: 16px; }
.step p { margin: 0; font-size: 14px; color: var(--ink-muted); }

 
pre.code {
  background: var(--surface-1);
  color: var(--ink);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;
  font-size: 13px;
  line-height: 1.6;
  tab-size: 2;
}
code.inline {
  background: var(--surface-2);
  border: 1px solid var(--hairline-soft);
  border-radius: 4px;
  padding: 1px 6px;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9em;
}

 
.table-wrap { overflow-x: auto; }
table.spec {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  overflow: hidden;
  font-size: 14px;
}
table.spec th, table.spec td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--hairline-soft);
  vertical-align: top;
}
table.spec th { background: var(--surface-2); font-weight: 600; white-space: nowrap; }
table.spec tr:last-child td { border-bottom: none; }

 
.notes { display: grid; gap: 12px; }
.note {
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  font-size: 14px;
}
.note strong { display: block; margin-bottom: 2px; }
.note p { margin: 0; color: var(--ink-muted); }

 
.projects { display: flex; gap: 10px; flex-wrap: wrap; }
.project-chip {
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 14px;
}
.project-chip .pid { color: var(--ink-subtle); font-size: 12px; margin-left: 6px; }

 
.docs-layout {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}
.docs-toc {
  position: sticky;
  top: 92px;  
  max-height: calc(100vh - 108px);
  overflow-y: auto;
}
.docs-toc-title {
  margin: 0 0 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-subtle);
}
.docs-toc ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.docs-toc a {
  display: block;
  padding: 7px 12px;
  border-left: 2px solid var(--hairline-soft);
  font-size: 13.5px;
  color: var(--ink-muted);
  text-decoration: none;
}
.docs-toc a:hover { color: var(--ink); background: var(--surface-2); }
.docs-toc a.is-active {
  color: var(--ink);
  border-left-color: var(--accent);
  background: var(--surface-1);
  font-weight: 600;
}
.doc-sec {
  padding: 6px 0 36px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--hairline-soft);
  scroll-margin-top: 96px;  
}
.doc-sec:last-child { border-bottom: none; }
.doc-sec h2 { font-size: 22px; margin: 0 0 4px; }
.doc-body ul { margin: 12px 0 0; padding-left: 1.2em; }
.doc-body li { margin: 6px 0; font-size: 14px; color: var(--ink-muted); }
.doc-body li strong { color: var(--ink); }
.doc-body p { font-size: 14px; color: var(--ink-muted); }
.doc-body h3 { font-size: 15px; margin: 20px 0 8px; }
@media (max-width: 860px) {
   
  .docs-layout { grid-template-columns: 1fr; gap: 24px; }
  .docs-toc { position: static; max-height: none; }
  .docs-toc ol { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
}

 
.board-embed { margin-top: 24px; }
 
.board-embed .convs-board {
  background: var(--surface-1);
  border-color: var(--hairline);
}
.board-embed .convs-input,
.board-embed .convs-textarea {
  border-color: var(--hairline);
  background: var(--canvas);
}
.board-embed .convs-bubble { background: var(--surface-2); }
.board-embed .convs-has-avatar .convs-bubble::before { border-right-color: var(--surface-2); }
.board-embed .convs-status[data-kind="error"] { color: var(--error); }

 
.board-panel {
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-top: 24px;
}
.board-mock {
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  font-size: 13px;
  color: var(--ink-muted);
  margin: 0 0 16px;
}
#board-form { display: grid; gap: 12px; }
.field { display: grid; gap: 4px; }
.field label { font-size: 13px; font-weight: 600; }
.field input, .field textarea {
  font: inherit;
  color: var(--ink);
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  width: 100%;
}
.field textarea { min-height: 96px; resize: vertical; }
.field input:focus, .field textarea:focus {
  outline: 3px solid var(--accent-strong);
  outline-offset: 0;
  border-color: var(--accent-strong);
}
.board-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
#board-counter { font-size: 13px; color: var(--ink-subtle); }
#board-counter.over { color: var(--error); font-weight: 700; }
#board-status { font-size: 14px; min-height: 1.4em; margin: 8px 0 0; }
#board-status[data-kind="error"] { color: var(--error); font-weight: 600; }
#board-status[data-kind="loading"] { color: var(--ink-muted); }

.board-list { margin-top: 20px; display: grid; gap: 10px; }
.board-item {
  border: 1px solid var(--hairline-soft);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  background: var(--canvas);
}
.board-meta { display: flex; gap: 12px; align-items: baseline; flex-wrap: wrap; }
.board-name { font-weight: 700; font-size: 14px; }
.board-time { color: var(--ink-subtle); font-size: 12px; }
.board-text {
  margin: 6px 0 0;
  font-size: 15px;
  white-space: pre-wrap;    
  word-break: break-word;
}
.board-empty { color: var(--ink-muted); font-size: 14px; }

 
dialog {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 24px;
  max-width: min(560px, 92vw);
  width: 100%;
  background: var(--surface-1);
  color: var(--ink);
}
dialog::backdrop { background: rgba(0, 0, 0, 0.65); }
dialog h2 { font-size: 20px; margin: 0 0 16px; }
.dialog-close { float: right; }

#hash-value {
  display: block;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  padding: 12px;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px;
  word-break: break-all;
  user-select: all;
}

.admin-summary {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-bottom: 8px;
}
.admin-cell {
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  padding: 10px;
  text-align: center;
  display: grid;
}
.admin-cell strong { font-size: 20px; }
.admin-cell span { font-size: 11px; color: var(--ink-muted); }
.admin-mock-note { font-size: 12px; color: var(--accent-text); margin: 0 0 8px; }
dialog h3 { font-size: 14px; margin: 16px 0 8px; }

.admin-days {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 120px;
}
.day-bar {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: center;
  gap: 4px;
  height: 100%;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}
.day-fill {
  width: 100%;
  background: var(--ink);
  border-radius: 3px 3px 0 0;
  min-height: 4px;
}
.day-bar:hover .day-fill { background: var(--accent); }
.day-label {
  font-size: 9px;
  color: var(--ink-subtle);
  transform: rotate(-45deg);
  white-space: nowrap;
}

.stat-row {
  display: grid;
  grid-template-columns: 90px 1fr 48px;
  gap: 8px;
  align-items: center;
  font-size: 12px;
  margin: 3px 0;
}
.stat-key { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.stat-track { background: var(--surface-2); border-radius: 3px; height: 8px; overflow: hidden; }
.stat-fill { display: block; height: 100%; background: var(--ink); border-radius: 3px; }
.stat-num { text-align: right; color: var(--ink-muted); }

 
[data-lang] { display: none !important; }
html[lang="ja"] [data-lang="ja"] { display: revert !important; }
html[lang="en"] [data-lang="en"] { display: revert !important; }

.lang-toggle {
  margin-left: 8px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-muted);
  background: none;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
}
.lang-toggle:hover { color: var(--ink); background: var(--surface-2); }

 
.waitlist { display: grid; gap: 8px; max-width: 480px; }
.waitlist-label { font-size: 13px; font-weight: 600; color: var(--ink-muted); }
.waitlist-row { display: flex; gap: 8px; flex-wrap: wrap; }
.waitlist-row input {
  flex: 1;
  min-width: 220px;
  padding: 10px 14px;
  font-size: 16px;  
  color: var(--ink);
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
}
.waitlist-row input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.waitlist-note { font-size: 13px; color: var(--accent-text); margin: 0; min-height: 1.4em; }

 
.mod-intro { color: var(--ink-muted); font-size: 12px; margin: 6px 0 10px; }
.mod-form { display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap; }
.mod-field { display: grid; gap: 4px; font-size: 12px; color: var(--ink-muted); }
.mod-select, .mod-input {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font: inherit;
  font-size: 13px;
  background: var(--surface);
  color: var(--ink);
}
.mod-input { min-width: 200px; }
.mod-summary { font-size: 12px; color: var(--ink-muted); margin: 10px 0 6px; }
.mod-bulk { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 10px; }
#admin-moderation { display: grid; gap: 10px; margin-top: 10px; font-size: 13px; }
.mod-row {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 12px;
  background: var(--surface-2);
}
 
.mod-row[data-hidden="true"] { opacity: .62; }
.mod-row-head { display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; }
.mod-name { font-size: 12px; }
.mod-time { color: var(--ink-muted); font-size: 12px; }
.mod-badge {
  font-size: 11px;
  padding: 1px 8px;
  border-radius: 999px;
  border: 1px solid var(--hairline);
  color: var(--ink-muted);
}
.mod-text { margin: 6px 0 10px; white-space: pre-wrap; word-break: break-word; }
.mod-actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.mod-note { font-size: 12px; color: var(--ink-muted); }

 
.report-filter { font-size: 12px; padding: 6px 12px; }
#admin-reports { display: grid; gap: 10px; margin-top: 10px; font-size: 13px; }
.report-card {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 12px;
  background: var(--surface-2);
}
.report-head { display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; }
.report-target { color: var(--ink-muted); font-size: 12px; }
.report-status {
  font-size: 11px;
  padding: 1px 8px;
  border-radius: 999px;
  border: 1px solid var(--hairline);
  color: var(--accent-text);
}
.report-status[data-status="resolved"] { color: var(--ink-subtle); }
.report-time { color: var(--ink-subtle); font-size: 11px; margin-left: auto; }
.report-excerpt {
  margin: 8px 0 0;
  color: var(--ink-muted);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.report-detail { margin: 4px 0 0; color: var(--ink-muted); overflow-wrap: anywhere; }
.report-actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-top: 10px; }
.report-actions .btn { font-size: 12px; padding: 6px 12px; }
.report-note { font-size: 12px; color: var(--accent-text); }

 
.site-footer {
  border-top: 1px solid var(--hairline-soft);
  margin-top: 88px;
  padding: 40px 0 56px;
  color: var(--ink-muted);
  font-size: 13px;
}
.site-footer .container { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
#footer-copy { user-select: none; }  
.site-footer .spacer { flex: 1; }

 
@media (max-width: 900px) {
  .cards { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  section { padding-top: 64px; scroll-margin-top: 108px; }  
  .hero { padding-top: 72px; }
  .cards { grid-template-columns: 1fr; }
  .admin-summary { grid-template-columns: repeat(2, 1fr); }
   
  .site-header .container { flex-wrap: wrap; gap: 0 12px; padding-top: 4px; padding-bottom: 6px; }
  .site-nav {
    order: 3;
    flex: 1 0 100%;
    margin-left: 0;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .site-nav a { padding: 6px 8px; white-space: nowrap; }
}