:root {
  --bg-page: #f5f7f9;
  --bg-surface: #ffffff;
  --bg-subtle: #f0f3f6;
  --bg-callout: #f2f9f6;
  --text-primary: #181a1c;
  --text-secondary: #374151;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --border-strong: #cbd5e1;
  --brand-primary: #0f5c4d;
  --brand-accent: #0d7462;
  --brand-light: #e6f4f1;
  --origin-self-bg: #e6f4f1;
  --origin-self-fg: #0b5345;
  --origin-comm-bg: #f1f5f9;
  --origin-comm-fg: #334155;
  --status-good: #065f46;
  --status-good-bg: #d1fae5;
  --status-warn: #92400e;
  --status-warn-bg: #fef3c7;
  --status-danger: #991b1b;
  --status-danger-bg: #fee2e2;
  --font-sans: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "BIZ UDPGothic", "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Consolas, "BIZ UDGothic", "Liberation Mono", Menlo, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-padding-top: 72px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.8;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--brand-primary);
  color: #ffffff;
  padding: 8px 16px;
  border-radius: 4px;
  font-weight: 700;
  z-index: 1000;
}

.skip-link:focus {
  top: 12px;
  color: #ffffff;
  outline: 2px solid var(--brand-accent);
}

a {
  color: var(--brand-accent);
  text-decoration: none;
}

a:hover {
  color: var(--brand-primary);
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--brand-accent);
  outline-offset: 2px;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Clean Editorial Tech Header (Zenn / Note / Qiita vibe) */
.site-header {
  background: var(--bg-surface);
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 58px;
  padding-top: 6px;
  padding-bottom: 6px;
  flex-wrap: wrap;
  gap: 12px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  font-weight: 800;
  font-size: 1.18rem;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand-logo:hover {
  color: var(--brand-primary);
  text-decoration: none;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--text-primary);
  color: #ffffff;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  flex-shrink: 0;
}

.brand-tagline {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
  border-left: 1px solid var(--border-strong);
  padding-left: 10px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.84rem;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--text-secondary);
  font-weight: 600;
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--brand-primary);
  text-decoration: underline;
}

/* Compliance Notice Bar */
.pr-banner {
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.75rem;
  padding: 6px 0;
}

/* Compact Reader Intro Banner (Replaces dark SaaS Hero) */
.editorial-intro {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 24px 0 20px;
}

.intro-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.intro-copy {
  max-width: 720px;
}

.intro-kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--brand-primary);
  margin-bottom: 4px;
}

.intro-copy h1 {
  font-size: 1.38rem;
  line-height: 1.4;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.intro-copy p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.intro-stats-inline {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  background: var(--bg-page);
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  border-radius: 6px;
  align-self: center;
}

.intro-stats-inline strong {
  color: var(--text-primary);
  font-weight: 700;
}

/* Index Controls & Feed List */
.controls-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  width: 100%;
  justify-content: space-between;
  margin: 22px 0 18px;
}

.filter-bar {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
}

.filter-btn[aria-pressed="true"],
.filter-btn:hover {
  background: var(--text-primary);
  color: #ffffff;
  border-color: var(--text-primary);
}

.search-input {
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  padding: 7px 12px;
  border-radius: 6px;
  font-size: 0.85rem;
  min-width: 240px;
  max-width: 100%;
}

/* Scannable Article Feed (Zenn / Qiita / Reddit list feel) */
.article-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 56px;
}

.article-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color 0.12s ease;
}

.article-card[data-origin="first_party"] {
  border-left: 4px solid var(--brand-accent);
}

.article-card[hidden] {
  display: none !important;
}

.article-card:hover {
  border-color: var(--border-strong);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.76rem;
  flex-wrap: wrap;
}

.origin-badge {
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.74rem;
}

.origin-self {
  background: var(--origin-self-bg);
  color: var(--origin-self-fg);
}

.origin-community {
  background: var(--origin-comm-bg);
  color: var(--origin-comm-fg);
}

.category-pill {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.76rem;
}

.date-text {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  margin-left: auto;
}

.article-card h2 {
  font-size: 1.18rem;
  line-height: 1.45;
  font-weight: 800;
  color: var(--text-primary);
}

.card-title-link {
  color: inherit;
  text-decoration: none;
}

.card-title-link:hover {
  color: var(--brand-accent);
  text-decoration: underline;
}

.article-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.card-takeaway-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--bg-subtle);
}

.card-metrics-inline {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.inline-metric {
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: var(--bg-page);
  padding: 3px 9px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
}

.inline-metric strong {
  font-family: var(--font-mono);
  color: var(--text-primary);
  font-weight: 700;
  margin-left: 4px;
}

.card-tags-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.tag-chip {
  color: var(--text-muted);
  background: var(--bg-subtle);
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 0.73rem;
}

/* Article Detail: Zenn / Qiita / Note 2-Column Readable Layout */
.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 760px) 280px;
  gap: 28px;
  align-items: start;
  padding: 28px 0 64px;
}

.article-sheet {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 36px 40px 48px;
}

.article-sidebar {
  position: sticky;
  top: 78px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.sidebar-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px 18px;
  font-size: 0.84rem;
}

.sidebar-title {
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-color);
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.toc-list a {
  color: var(--text-secondary);
  font-size: 0.82rem;
  line-height: 1.45;
  display: block;
}

.toc-list a:hover {
  color: var(--brand-primary);
}

.meta-kv-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.meta-kv-row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  border-bottom: 1px dashed var(--border-color);
  padding-bottom: 4px;
}

.meta-kv-row strong {
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.breadcrumb {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 14px;
  word-break: break-word;
}

.article-meta-top {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.article-title {
  font-size: 1.72rem;
  line-height: 1.38;
  font-weight: 800;
  letter-spacing: -0.015em;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.article-subtitle {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 14px;
}

.article-tags-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.article-timestamps {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 24px;
}

/* TL;DR / Key Takeaways Callout (結論ファースト) */
.tldr-box {
  background: var(--bg-callout);
  border: 1px solid #b7e4d8;
  border-left: 4px solid var(--brand-accent);
  border-radius: 6px;
  padding: 18px 20px;
  margin-bottom: 28px;
}

.tldr-title {
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--origin-self-fg);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.tldr-list {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--text-primary);
  line-height: 1.7;
}

.kpi-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 155px), 1fr));
  gap: 10px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid #ccebe2;
}

.kpi-item {
  background: #ffffff;
  border: 1px solid #d5ede6;
  border-radius: 6px;
  padding: 10px 12px;
}

.kpi-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
}

.kpi-value {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  margin: 2px 0;
}

.kpi-sub {
  font-size: 0.72rem;
  color: var(--text-secondary);
}

/* Cohesive Markdown-Style Sections inside Article Sheet */
.article-section {
  margin-top: 38px;
}

.section-h2 {
  font-size: 1.28rem;
  font-weight: 800;
  color: var(--text-primary);
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border-color);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.section-subnote {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
}

.prose-section {
  margin-bottom: 28px;
}

.prose-section h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 24px 0 10px;
  padding-left: 10px;
  border-left: 3px solid var(--brand-accent);
}

.prose-section p {
  color: var(--text-primary);
  font-size: 0.98rem;
  line-height: 1.85;
}

.methodology-box {
  background: var(--bg-page);
  border: 1px solid var(--border-color);
  padding: 14px 16px;
  border-radius: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-top: 12px;
}

.csv-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--brand-primary);
  background: var(--brand-light);
  border: 1px solid #a7f3d0;
  padding: 5px 11px;
  border-radius: 4px;
  text-decoration: none;
}

.csv-btn:hover {
  background: #d1fae5;
  text-decoration: none;
}

/* Honest Zero-Baseline Quantitative Plot */
.gap-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 12px;
}

.gap-item {
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 14px 16px;
  background: var(--bg-page);
}

.gap-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  flex-wrap: wrap;
  gap: 8px;
}

.gap-item-name {
  font-weight: 700;
  font-size: 0.94rem;
}

.status-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}

.status-good {
  background: var(--status-good-bg);
  color: var(--status-good);
}

.status-warning {
  background: var(--status-warn-bg);
  color: var(--status-warn);
}

.status-danger {
  background: var(--status-danger-bg);
  color: var(--status-danger);
}

.bar-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 8px 0;
}

.bar-row {
  display: grid;
  grid-template-columns: 270px 1fr;
  align-items: center;
  gap: 12px;
}

.bar-label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

.bar-svg {
  width: 100%;
  height: 10px;
  background: #e2e8f0;
  border-radius: 2px;
  overflow: hidden;
  display: block;
}

.bar-rect-official {
  fill: #94a3b8;
}

.bar-rect-measured {
  fill: var(--brand-accent);
}

.gap-note {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--border-color);
}

/* Booktabs-style Comparison Table with Right-Aligned Numeric Columns */
.table-wrap {
  overflow-x: auto;
  margin-top: 12px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
}

table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.84rem;
  text-align: left;
  font-variant-numeric: tabular-nums;
}

table.data-table caption {
  text-align: left;
  font-size: 0.76rem;
  color: var(--text-muted);
  padding: 8px 12px;
  background: var(--bg-page);
  border-bottom: 1px solid var(--border-color);
}

table.data-table thead th {
  background: var(--bg-subtle);
  color: var(--text-primary);
  font-weight: 700;
  padding: 0;
  white-space: nowrap;
  font-size: 0.78rem;
  border-bottom: 2px solid var(--border-strong);
}

.th-sort-btn {
  background: transparent;
  border: none;
  color: inherit;
  font: inherit;
  font-weight: 700;
  padding: 10px 12px;
  width: 100%;
  text-align: left;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
}

.th-sort-btn:hover {
  background: #e2e8f0;
}

table.data-table td,
table.data-table tbody th {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.82rem;
}

table.data-table td.num-cell {
  text-align: right;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

table.data-table tbody th {
  font-family: var(--font-sans);
  font-weight: 700;
  background: #fafbfc;
  color: var(--text-primary);
}

table.data-table tr:last-child td,
table.data-table tr:last-child th {
  border-bottom: none;
}

table.data-table tbody tr:hover td,
table.data-table tbody tr:hover th {
  background: var(--bg-page);
}

/* Reference / Affiliate Links */
.cta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
  gap: 12px;
  margin-top: 12px;
}

.cta-card {
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 14px 16px;
  background: var(--bg-page);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 10px;
}

.cta-badge {
  display: inline-block;
  background: var(--brand-light);
  color: var(--brand-primary);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
  width: fit-content;
}

.cta-title {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--text-primary);
  margin-top: 6px;
}

.cta-provider {
  font-size: 0.76rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--text-primary);
  color: #ffffff;
  font-weight: 600;
  font-size: 0.82rem;
  padding: 8px 14px;
  border-radius: 4px;
  text-align: center;
  text-decoration: none;
}

.cta-btn:hover {
  background: var(--brand-primary);
  color: #ffffff;
  text-decoration: none;
}

.cta-disclosure-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 10px;
}

/* FAQ & Sources */
.faq-list {
  margin-top: 8px;
}

.faq-item {
  border-bottom: 1px solid var(--border-color);
  padding: 14px 0;
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-q {
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.faq-a {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

.source-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
}

.source-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-page);
  border: 1px solid var(--border-color);
  padding: 9px 12px;
  border-radius: 4px;
  font-size: 0.82rem;
  flex-wrap: wrap;
  gap: 8px;
}

.source-meta {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.74rem;
}

/* Clean Minimal Footer */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 40px 0 32px;
  font-size: 0.84rem;
  margin-top: 48px;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.footer-desc {
  max-width: 500px;
  color: var(--text-secondary);
  margin-top: 8px;
  font-size: 0.82rem;
}

.footer-amazon-notice {
  margin-top: 8px;
  font-size: 0.76rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-secondary);
  font-weight: 600;
}

.footer-bottom {
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.76rem;
  color: var(--text-muted);
}

.panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 28px 32px;
  margin-bottom: 24px;
}

@media (max-width: 960px) {
  .article-layout {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    position: static;
    order: -1;
  }
}

@media (max-width: 680px) {
  .brand-tagline {
    display: none;
  }
  .article-sheet {
    padding: 22px 18px 32px;
  }
  .article-title {
    font-size: 1.38rem;
  }
  .bar-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}