:root {
  --bg: #ffffff;
  --surface-soft: #f7f7f8;
  --surface-code: #f4f4f5;
  --ink: #0d0d0d;
  --ink-secondary: #4b5563;
  --ink-tertiary: #6b7280;
  --line: #e5e7eb;
  --line-strong: #d1d5db;
  --accent: #1a73e8;
  --accent-hover: #1557b0;
  --max-w: 1120px;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", Meiryo, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

html[data-lang="en"] [data-i18n="ja"] {
  display: none !important;
}
html[data-lang="ja"] [data-i18n="en"] {
  display: none !important;
}

a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--line-strong);
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}
a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

code, pre {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

code {
  background: var(--surface-code);
  border-radius: 4px;
  padding: 0.14em 0.36em;
  font-size: 0.875em;
  color: var(--ink);
}

h1 code, h2 code, h3 code, .btn code {
  background: transparent;
  padding: 0;
  font-size: 0.94em;
}

pre {
  background: var(--surface-soft);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.1rem 1.25rem;
  overflow-x: auto;
  line-height: 1.55;
  margin: 0.85rem 0;
}
pre code {
  background: transparent;
  padding: 0;
  font-size: 0.86rem;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.75rem;
}

/* Minimalist Light Header (OpenAI / Chrome pattern) */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.90);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  height: 64px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--ink);
  font-weight: 650;
  font-size: 1rem;
  letter-spacing: -0.015em;
  text-decoration: none;
}
.brand-link:hover {
  color: var(--ink);
  opacity: 0.8;
}
.brand-link img {
  width: 30px;
  height: 30px;
  border-radius: 7px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.6rem;
}
.nav-links a {
  color: var(--ink-secondary);
  font-size: 0.9rem;
  font-weight: 450;
  text-decoration: none;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px;
  background: var(--surface-soft);
}
.lang-switch button {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--ink-secondary);
  font-size: 0.78rem;
  font-weight: 550;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  cursor: pointer;
}
.lang-switch button.active {
  background: var(--bg);
  color: var(--ink);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
}

.nav-gh {
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--ink-secondary);
  text-decoration: none;
  padding: 0.32rem 0.65rem;
  border-radius: 999px;
}
.nav-gh:hover {
  color: var(--ink);
  background: var(--surface-soft);
}

/* Centered Pure-White Download Hero (Chrome + ChatGPT Desktop pattern) */
.hero {
  padding: 5.2rem 0 4rem;
  text-align: center;
}

.hero-narrow {
  max-width: 820px;
  margin: 0 auto;
}

.hero-app-icon {
  width: 76px;
  height: 76px;
  border-radius: 18px;
  margin-bottom: 1.6rem;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.14);
}

.hero h1 {
  margin: 0 0 1.15rem;
  font-size: clamp(2.35rem, 4.8vw, 3.65rem);
  font-weight: 680;
  line-height: 1.09;
  letter-spacing: -0.035em;
  color: var(--ink);
  word-break: auto-phrase;
  text-wrap: balance;
}

.hero-lead {
  margin: 0 auto 2.1rem;
  max-width: 650px;
  font-size: 1.15rem;
  line-height: 1.62;
  color: var(--ink-secondary);
  font-weight: 400;
  word-break: auto-phrase;
  text-wrap: pretty;
}

.cta-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.82rem 1.55rem;
  border-radius: 999px;
  font-size: 0.96rem;
  font-weight: 550;
  text-decoration: none !important;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  cursor: pointer;
}

.btn-dark {
  background: var(--ink);
  color: #ffffff !important;
  border: 1px solid var(--ink);
}
.btn-dark:hover {
  background: #262626;
  border-color: #262626;
}

.btn-light {
  background: var(--surface-soft);
  color: var(--ink) !important;
  border: 1px solid var(--line);
}
.btn-light:hover {
  background: #ededf0;
  border-color: var(--line-strong);
}

.btn-sm {
  padding: 0.52rem 1.05rem;
  font-size: 0.875rem;
}

.btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.hero-spec {
  margin: 0 auto;
  max-width: 820px;
  font-size: 0.84rem;
  color: var(--ink-tertiary);
  word-break: auto-phrase;
  text-wrap: pretty;
}
.hero-spec a {
  color: var(--ink-secondary);
}

/* Calm Product Canvas Stage & Horizontal Auto-Sliding Gallery */
.canvas-stage {
  --hero-progress: 0;
  margin-top: 3.4rem;
  background: var(--surface-soft);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 1.25rem 1.6rem 1.25rem;
  text-align: left;
}

.canvas-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem;
  margin-bottom: 0.95rem;
}

.canvas-pills {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  overflow-x: auto;
  scrollbar-width: none;
  padding-bottom: 2px;
}
.canvas-pills::-webkit-scrollbar {
  display: none;
}

.canvas-pill {
  position: relative;
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  color: var(--ink-tertiary);
  font-family: inherit;
  font-size: 0.81rem;
  font-weight: 520;
  padding: 0.36rem 0.78rem 0.44rem;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  transition: color 0.16s ease, background 0.16s ease, border-color 0.16s ease;
}
.canvas-pill:hover {
  color: var(--ink);
  background: rgba(13, 13, 13, 0.04);
}
.canvas-pill.active {
  color: var(--ink);
  font-weight: 600;
  background: #ffffff;
  border-color: var(--line-strong);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.canvas-pill-bar {
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 3px;
  height: 2px;
  border-radius: 2px;
  background: rgba(13, 13, 13, 0.10);
  opacity: 0;
  overflow: hidden;
}
.canvas-pill.active .canvas-pill-bar {
  opacity: 1;
}
.canvas-pill.active .canvas-pill-bar::after {
  content: "";
  display: block;
  width: 100%;
  height: 100%;
  background: var(--ink);
  transform-origin: left center;
  transform: scaleX(var(--hero-progress, 0));
  transition: transform 0.07s linear;
}
.canvas-stage.is-paused .canvas-pill.active .canvas-pill-bar {
  opacity: 0.35;
}

.canvas-controls {
  display: inline-flex;
  align-items: center;
  gap: 0.32rem;
  flex-shrink: 0;
}

.canvas-ctrl-btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--ink-secondary);
  cursor: pointer;
  padding: 0;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.canvas-ctrl-btn:hover {
  color: var(--ink);
  border-color: var(--line-strong);
  background: #fdfdfd;
}
.canvas-ctrl-btn svg {
  width: 14px;
  height: 14px;
}
.canvas-ctrl-btn .icon-play {
  display: none;
}
.canvas-stage.is-paused .canvas-ctrl-btn .icon-pause {
  display: none;
}
.canvas-stage.is-paused .canvas-ctrl-btn .icon-play {
  display: block;
}

.canvas-frame {
  position: relative;
  aspect-ratio: 15 / 8;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

.canvas-track {
  display: flex;
  width: 100%;
  height: 100%;
  will-change: transform;
}

.canvas-slide {
  flex: 0 0 100%;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ffffff;
}

.canvas-slide img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  user-select: none;
  -webkit-user-drag: none;
}

.canvas-caption-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem 1.25rem;
  padding-top: 0.95rem;
  font-size: 0.86rem;
  color: var(--ink-secondary);
  min-height: 2.6rem;
}

.canvas-captions {
  flex: 1 1 520px;
}

.canvas-caption-item {
  display: none;
}
.canvas-caption-item.active {
  display: block;
}

.canvas-caption-links {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
  font-size: 0.85rem;
}
.caption-sep {
  color: var(--ink-tertiary);
}

/* Editorial Sections */
.section {
  padding: 5.5rem 0;
  border-top: 1px solid var(--line);
}

.section-soft {
  background: var(--surface-soft);
}

.section-intro {
  max-width: 680px;
  margin-bottom: 3rem;
}

.section-intro h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 3vw, 2.35rem);
  font-weight: 650;
  line-height: 1.18;
  letter-spacing: -0.028em;
}

.section-intro p {
  margin: 0;
  font-size: 1.06rem;
  color: var(--ink-secondary);
}

/* Asymmetric 2-Column Editorial Split ("Why MFRM") */
.split-2col {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 3.5rem;
  align-items: start;
}

.editorial-points {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.editorial-point h3 {
  margin: 0 0 0.3rem;
  font-size: 1.05rem;
  font-weight: 620;
}
.editorial-point p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--ink-secondary);
}

.clean-spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}
.clean-spec-table th,
.clean-spec-table td {
  padding: 0.9rem 0.75rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}
.clean-spec-table th {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ink-tertiary);
  border-bottom: 1px solid var(--ink);
}
.clean-spec-table caption {
  caption-side: bottom;
  text-align: left;
  padding-top: 0.75rem;
  font-size: 0.83rem;
  color: var(--ink-tertiary);
}

/* OpenAI Download-Style Horizontal Platform Directory (Desktop / Web / mfrmr) */
.platform-list {
  border-top: 1px solid var(--line-strong);
}

.platform-row {
  display: grid;
  grid-template-columns: 240px 1fr 270px;
  gap: 2.25rem;
  padding: 2.2rem 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
}

.platform-id h3 {
  margin: 0 0 0.28rem;
  font-size: 1.25rem;
  font-weight: 640;
  letter-spacing: -0.015em;
}
.platform-meta {
  font-size: 0.84rem;
  color: var(--ink-tertiary);
}

.platform-desc p {
  margin: 0 0 0.75rem;
  font-size: 0.96rem;
  color: var(--ink);
}
.platform-desc .fineprint {
  margin: 0;
  font-size: 0.86rem;
  color: var(--ink-secondary);
}

.platform-cta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.6rem;
}

.cmd-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: #ffffff;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 0.48rem 0.7rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.83rem;
  color: var(--ink);
}
.copy-btn {
  appearance: none;
  border: none;
  background: var(--surface-soft);
  color: var(--ink-secondary);
  font-size: 0.76rem;
  font-weight: 550;
  padding: 0.22rem 0.55rem;
  border-radius: 5px;
  cursor: pointer;
}
.copy-btn:hover {
  color: var(--ink);
  background: var(--line);
}

.inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  font-size: 0.86rem;
}

/* Minimal Underline Tabs for Interactive Plot Studio */
.tab-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 1.75rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 2.2rem;
}

.tab-btn {
  appearance: none;
  border: none;
  background: transparent;
  padding: 0.75rem 0;
  margin-bottom: -1px;
  border-bottom: 2px solid transparent;
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--ink-tertiary);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.tab-btn:hover {
  color: var(--ink);
}
.tab-btn.active {
  color: var(--ink);
  border-bottom-color: var(--ink);
  font-weight: 600;
}

.plot-panel {
  display: none;
}
.plot-panel.active {
  display: grid;
  grid-template-columns: 1.18fr 0.82fr;
  gap: 2.75rem;
  align-items: start;
}

.plot-frame {
  background: var(--surface-soft);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem;
}
.plot-frame img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
  background: #ffffff;
}

.plot-reading h3 {
  margin: 0 0 1rem;
  font-size: 1.25rem;
  font-weight: 640;
  letter-spacing: -0.015em;
}
.reading-item {
  padding: 0.85rem 0;
  border-top: 1px solid var(--line);
}
.reading-item strong {
  display: block;
  font-size: 0.84rem;
  color: var(--ink);
  margin-bottom: 0.22rem;
}
.reading-item p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink-secondary);
}

/* Capabilities & Limits Editorial Matrix */
.cap-matrix {
  border-top: 1px solid var(--ink);
}

.cap-head {
  display: grid;
  grid-template-columns: 205px 1fr 1.08fr;
  gap: 2.25rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--ink);
  font-size: 0.82rem;
  font-weight: 620;
  color: var(--ink);
}

.cap-row {
  display: grid;
  grid-template-columns: 205px 1fr 1.08fr;
  gap: 2.25rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line-strong);
  align-items: start;
}

.cap-topic h3 {
  margin: 0 0 0.25rem;
  font-size: 0.98rem;
  font-weight: 630;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.cap-topic span.cap-sub {
  display: block;
  font-size: 0.8rem;
  color: var(--ink-tertiary);
  line-height: 1.45;
}

.cap-col ul {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.91rem;
  color: var(--ink-secondary);
}

.cap-col li + li {
  margin-top: 0.45rem;
}

.cap-col strong {
  color: var(--ink);
  font-weight: 600;
}

.cap-action {
  margin: 0.65rem 0 0;
  padding-top: 0.55rem;
  border-top: 1px solid var(--line);
  font-size: 0.84rem;
  color: var(--ink-secondary);
  line-height: 1.55;
}

.cap-mobile-label {
  display: none;
  font-size: 0.76rem;
  font-weight: 640;
  color: var(--ink);
  margin-bottom: 0.35rem;
}

/* Minimal Hairline Accordion FAQ (OpenAI / Chrome pattern) */
.faq-list {
  border-top: 1px solid var(--ink);
}

.faq-item {
  border-bottom: 1px solid var(--line-strong);
}

.faq-item summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.45rem 0;
  cursor: pointer;
  user-select: none;
}
.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-q {
  font-size: 1.06rem;
  font-weight: 620;
  letter-spacing: -0.015em;
  color: var(--ink);
  line-height: 1.42;
}
.faq-item summary:hover .faq-q {
  color: var(--accent);
}

.faq-icon {
  position: relative;
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  color: var(--ink-secondary);
}
.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: currentColor;
  transform: translate(-50%, -50%);
  transition: transform 0.18s ease, opacity 0.18s ease;
}
.faq-icon::before {
  width: 13px;
  height: 1.5px;
}
.faq-icon::after {
  width: 1.5px;
  height: 13px;
}
.faq-item[open] .faq-icon::after {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(90deg);
}

.faq-body {
  max-width: 860px;
  padding: 0 2.5rem 1.55rem 0;
}
.faq-body p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--ink-secondary);
}
.faq-body strong {
  color: var(--ink);
  font-weight: 600;
}

.section-soft pre {
  background: #ffffff;
}

/* Clean Editorial Directory for Guides & Citation */
.doc-directory {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid var(--line);
}
.doc-entry {
  display: block;
  padding: 1.5rem 1.5rem 1.5rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none !important;
}
.doc-entry:nth-child(odd) {
  padding-right: 2rem;
}
.doc-entry:nth-child(even) {
  padding-left: 2rem;
  border-left: 1px solid var(--line);
}
.doc-entry h3 {
  margin: 0 0 0.3rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
}
.doc-entry:hover h3 {
  color: var(--accent);
}
.doc-entry p {
  margin: 0;
  font-size: 0.91rem;
  color: var(--ink-secondary);
}

.scope-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 3rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--line);
}
.scope-col h4 {
  margin: 0 0 0.45rem;
  font-size: 0.95rem;
  font-weight: 620;
}
.scope-col p {
  margin: 0;
  font-size: 0.89rem;
  color: var(--ink-secondary);
}

.source-run-bar {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 2.5rem;
  margin-top: 2.5rem;
  padding-top: 2.25rem;
  border-top: 1px solid var(--line);
  align-items: start;
}
.source-run-meta h3 {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
  font-weight: 620;
}
.source-run-meta p {
  margin: 0;
  font-size: 0.89rem;
  color: var(--ink-secondary);
  line-height: 1.65;
}
.source-run-bar pre {
  margin: 0;
}

/* APA 7th Citation Rows + MIT License & Bug Report Hairline Grid */
.cite-list {
  border-top: 1px solid var(--ink);
}

.cite-row {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2.25rem;
  padding: 1.55rem 0;
  border-bottom: 1px solid var(--line-strong);
  align-items: start;
}

.cite-edition h3 {
  margin: 0 0 0.22rem;
  font-size: 1.05rem;
  font-weight: 630;
  letter-spacing: -0.015em;
}
.cite-sub {
  font-size: 0.82rem;
  color: var(--ink-tertiary);
}

.cite-apa-bar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.25rem;
  padding: 0.9rem 1.05rem;
  background: var(--surface-soft);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.cite-apa {
  margin: 0;
  padding-left: 1.85rem;
  text-indent: -1.85rem;
  font-size: 0.93rem;
  line-height: 1.62;
  color: var(--ink);
  word-break: break-word;
}
.cite-apa em {
  font-style: italic;
}

.cite-apa-bar .copy-btn {
  flex-shrink: 0;
  background: #ffffff;
  border: 1px solid var(--line-strong);
  padding: 0.28rem 0.65rem;
}
.cite-apa-bar .copy-btn:hover {
  border-color: var(--ink-tertiary);
}

.cite-note {
  margin: 0.55rem 0 0;
  font-size: 0.85rem;
  color: var(--ink-secondary);
  line-height: 1.58;
}

.legal-contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-top: 2.75rem;
}

.legal-col h3 {
  margin: 0 0 0.65rem;
  font-size: 1.06rem;
  font-weight: 630;
  letter-spacing: -0.015em;
}
.legal-col p {
  margin: 0 0 0.8rem;
  font-size: 0.91rem;
  line-height: 1.68;
  color: var(--ink-secondary);
}
.legal-col p:last-child {
  margin-bottom: 0;
}
.legal-col strong {
  color: var(--ink);
  font-weight: 600;
}

/* Guide / Markdown Page Layout (Clean Quarto / Stripe / OpenAI Docs feel) */
.doc-page-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 230px;
  gap: 3.5rem;
  padding: 3rem 0 5rem;
  align-items: start;
}

.doc-article {
  min-width: 0;
}
.doc-article h1 {
  font-size: 2.15rem;
  line-height: 1.18;
  margin-top: 0.2rem;
  letter-spacing: -0.028em;
}
.doc-article h2 {
  font-size: 1.45rem;
  margin-top: 2.6rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--line);
  letter-spacing: -0.018em;
}
.doc-article h3 {
  font-size: 1.14rem;
  margin-top: 1.8rem;
}
.doc-article img {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
}
.doc-article hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 2.4rem 0;
}
.doc-article table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.4rem 0;
  font-size: 0.91rem;
  display: block;
  overflow-x: auto;
}
.doc-article th,
.doc-article td {
  border-bottom: 1px solid var(--line);
  padding: 0.7rem 0.75rem;
  vertical-align: top;
  text-align: left;
}
.doc-article th {
  font-weight: 620;
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
}
.doc-article blockquote {
  margin: 1.25rem 0;
  padding: 0.75rem 1.1rem;
  border-left: 2px solid var(--ink);
  color: var(--ink-secondary);
}

.gh-alert {
  margin: 1.35rem 0;
  padding: 0.95rem 1.15rem;
  border-radius: 10px;
  background: var(--surface-soft);
  border: 1px solid var(--line);
  font-size: 0.92rem;
}
.gh-alert-title {
  font-weight: 650;
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  color: var(--ink);
  margin-bottom: 0.25rem;
}
.gh-alert p {
  margin: 0;
  color: var(--ink-secondary);
}

.doc-toc {
  position: sticky;
  top: 88px;
  border-left: 1px solid var(--line);
  padding-left: 1rem;
  font-size: 0.83rem;
}
.doc-toc h4 {
  margin: 0 0 0.6rem;
  font-size: 0.76rem;
  font-weight: 620;
  color: var(--ink-tertiary);
}
.doc-toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.doc-toc li + li {
  margin-top: 0.42rem;
}
.doc-toc a {
  color: var(--ink-tertiary);
  text-decoration: none;
}
.doc-toc a:hover {
  color: var(--ink);
}

/* Desktop First-Launch & Security Verification Panel */
.trust-launch-card {
  background: var(--surface-soft);
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  padding: 1.55rem 1.75rem;
  margin: 0.25rem 0 1.25rem;
}

.trust-launch-head h4 {
  margin: 0 0 0.4rem;
  font-size: 1.02rem;
  font-weight: 640;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.trust-launch-head p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--ink-secondary);
}

.trust-pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1.15rem 0 1.35rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.trust-pillar strong {
  display: block;
  font-size: 0.83rem;
  font-weight: 630;
  color: var(--ink);
  margin-bottom: 0.2rem;
}

.trust-pillar p {
  margin: 0;
  font-size: 0.83rem;
  line-height: 1.52;
  color: var(--ink-secondary);
}

.trust-os-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.trust-os-box {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.15rem 1.25rem;
}

.trust-os-box h5 {
  margin: 0 0 0.65rem;
  font-size: 0.92rem;
  font-weight: 640;
  color: var(--ink);
}

.trust-steps {
  margin: 0 0 0.9rem;
  padding-left: 1.2rem;
  font-size: 0.86rem;
  line-height: 1.62;
  color: var(--ink-secondary);
}

.trust-steps li + li {
  margin-top: 0.42rem;
}

.trust-steps strong {
  color: var(--ink);
  font-weight: 600;
}

.btn-pill-safe {
  display: inline-block;
  padding: 0.08rem 0.48rem;
  border-radius: 5px;
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  color: #065f46;
  font-weight: 620;
  font-size: 0.81rem;
}

.btn-pill-avoid {
  display: inline-block;
  padding: 0.08rem 0.48rem;
  border-radius: 5px;
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
  font-weight: 600;
  font-size: 0.81rem;
}

.hash-verify-box {
  margin-top: 0.65rem;
  padding-top: 0.65rem;
  border-top: 1px solid var(--line);
}

.hash-verify-box .cmd-box {
  align-items: center;
  gap: 0.6rem;
}

.hash-verify-box .cmd-box > span {
  word-break: break-all;
  min-width: 0;
}

.hash-verify-box .copy-btn {
  white-space: nowrap;
  flex-shrink: 0;
}

.hash-verify-label {
  display: block;
  font-size: 0.77rem;
  font-weight: 600;
  color: var(--ink-tertiary);
  margin-bottom: 0.35rem;
}

.hash-expected {
  margin: 0.38rem 0 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.72rem;
  line-height: 1.45;
  color: var(--ink-tertiary);
  word-break: break-all;
}

.trust-optional-verify {
  margin-top: 1.15rem;
  padding-top: 0.95rem;
  border-top: 1px solid var(--line);
}

.trust-optional-verify summary {
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 560;
  color: var(--ink-secondary);
  user-select: none;
}

.trust-optional-verify summary:hover {
  color: var(--ink);
}

.trust-optional-body {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--ink-secondary);
  line-height: 1.6;
}

.trust-optional-body p {
  margin: 0 0 0.65rem;
}

/* Minimal Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 2.5rem 0;
  font-size: 0.86rem;
  color: var(--ink-tertiary);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}
.site-footer a {
  color: var(--ink-secondary);
  text-decoration: none;
}
.site-footer a:hover {
  color: var(--ink);
}

@media (max-width: 920px) {
  .split-2col,
  .platform-row,
  .plot-panel.active,
  .cap-row,
  .scope-grid,
  .source-run-bar,
  .cite-row,
  .legal-contact-grid,
  .trust-pillars,
  .trust-os-grid,
  .doc-page-wrap {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  .cap-head {
    display: none;
  }
  .cap-mobile-label {
    display: block;
  }
  .doc-directory {
    grid-template-columns: 1fr;
  }
  .doc-entry:nth-child(even) {
    padding-left: 0;
    border-left: none;
  }
  .doc-toc {
    position: static;
    order: -1;
    border-left: none;
    border-bottom: 1px solid var(--line);
    padding: 0 0 1rem;
  }
}

@media (max-width: 680px) {
  .nav-links {
    display: none;
  }
  .hero {
    padding: 3.5rem 0 2.5rem;
  }
  .canvas-stage {
    padding: 1rem;
  }
}