:root {
  --color-bg: #FFFCF5;
  --color-panel: #F4FAF8;
  --color-panel-strong: #E7F5F3;
  --color-border: #CFE1DE;
  --color-accent: #00A6B2;
  --color-accent-dark: #007681;
  --color-text: #121716;
  --color-muted: #667371;
  --color-success: #16845B;
  --color-warning: #A96C16;
  --color-error: #C54B43;
  --color-white: #FFFFFF;
  --color-shadow: rgb(18 23 22 / 10%);
  --color-accent-soft: rgb(0 166 178 / 14%);
  --color-accent-faint: rgb(0 166 178 / 7%);
  --color-transparent: transparent;
  --font-display: Inter, "Noto Sans SC", "Noto Sans JP", "Noto Sans KR", system-ui, sans-serif;
  --font-body: Inter, "Noto Sans SC", "Noto Sans JP", "Noto Sans KR", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Consolas, monospace;
  --radius-xs: 0.45rem;
  --radius-sm: 0.75rem;
  --radius-md: 1.1rem;
  --radius-lg: 1.5rem;
  --radius-xl: 2rem;
  --radius-pill: 999px;
  --gutter: clamp(1rem, 4vw, 2rem);
  --page-width: 76rem;
  --reading-width: 48rem;
  --header-height: 4.5rem;
  --toc-top: 5.5rem;
  --shadow-button: 0 0.6rem 1.4rem var(--color-shadow);
  --shadow-card: 0 1rem 2.8rem var(--color-shadow);
  --shadow-soft: 0 0.5rem 1.5rem var(--color-shadow);
}

.blog-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(4.5rem, 10vw, 8rem);
  border-bottom: 1px solid var(--color-border);
  background:
    radial-gradient(circle at 50% 20%, var(--color-accent-soft), var(--color-transparent) 45%),
    var(--color-bg);
}

.blog-hero::after {
  position: absolute;
  inset: auto 0 0;
  height: 5rem;
  background-image: radial-gradient(var(--color-border) 1px, var(--color-transparent) 1px);
  background-size: 1rem 1rem;
  mask-image: linear-gradient(to bottom, var(--color-transparent), var(--color-text));
  opacity: 0.45;
  content: "";
  pointer-events: none;
}

.blog-hero-inner {
  position: relative;
  z-index: 1;
  max-width: 58rem;
  text-align: center;
}

.blog-hero .kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 1.25rem;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.blog-hero .kicker-dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  box-shadow: 0 0 0 0.35rem var(--color-accent-soft);
}

.blog-hero h1 {
  max-width: 54rem;
  margin: 0 auto;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 6vw, 3rem);
  line-height: 1.14;
  letter-spacing: -0.018em;
  text-wrap: pretty;
}

.blog-hero p {
  max-width: 42rem;
  margin: 1.35rem auto 0;
  color: var(--color-muted);
  font-size: clamp(1rem, 2vw, 1.1rem);
  line-height: 1.8;
}

.blog-library {
  padding-block: clamp(3.5rem, 8vw, 6.5rem);
}

.blog-library-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.blog-library-heading h2 {
  margin: 0.35rem 0 0;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  letter-spacing: -0.015em;
}

.section-index,
.blog-cta-label {
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.blog-result-count {
  flex: 0 0 auto;
  margin: 0;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.blog-filters {
  display: flex;
  gap: 0.65rem;
  margin-bottom: 2rem;
  padding-bottom: 0.35rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.blog-filter {
  flex: 0 0 auto;
  min-height: 2.65rem;
  padding: 0.55rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  color: var(--color-muted);
  font: 700 0.88rem/1 var(--font-body);
  cursor: pointer;
  transition:
    border-color 180ms ease,
    background-color 180ms ease,
    color 180ms ease,
    transform 180ms ease;
}

.blog-filter:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-dark);
  transform: translateY(-1px);
}

.blog-filter:focus-visible {
  outline: 3px solid var(--color-accent-soft);
  outline-offset: 2px;
}

.blog-filter.is-active {
  border-color: var(--color-accent-dark);
  background: var(--color-accent-dark);
  color: var(--color-white);
}

.blog-card-list {
  display: grid;
  gap: 1rem;
}

.article-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.85rem 2rem;
  align-items: center;
  padding: clamp(1.35rem, 4vw, 2rem);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow: 0 0 0 var(--color-transparent);
  transition:
    border-color 180ms ease,
    box-shadow 180ms ease,
    transform 180ms ease;
}

.article-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-soft);
  transform: translateY(-2px);
}

.article-meta {
  display: flex;
  grid-column: 1;
  align-items: center;
  justify-content: flex-start;
  gap: 0.7rem;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  line-height: 1.5;
}

.article-meta .tag,
.post-hero-meta .tag {
  display: inline-flex;
  align-items: center;
  min-height: 1.75rem;
  padding-inline: 0.7rem;
  border-radius: var(--radius-pill);
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
  font-family: var(--font-body);
  font-weight: 750;
}

.article-card h3 {
  grid-column: 1;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 3vw, 1.55rem);
  line-height: 1.45;
  letter-spacing: -0.012em;
  text-wrap: pretty;
}

.article-card h3 a {
  color: var(--color-text);
  text-decoration: none;
}

.article-card h3 a:hover {
  color: var(--color-accent-dark);
}

.article-card p {
  grid-column: 1;
  max-width: 54rem;
  margin: 0;
  color: var(--color-muted);
  font-size: 0.98rem;
  line-height: 1.75;
}

.article-read-link {
  display: inline-flex;
  grid-column: 2;
  grid-row: 1 / span 3;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 0.95rem;
  border-radius: var(--radius-pill);
  color: var(--color-accent-dark);
  font-size: 0.9rem;
  font-weight: 750;
  text-decoration: none;
}

.article-read-link:hover {
  background: var(--color-accent-soft);
}

.article-read-link svg {
  width: 1.1rem;
  height: 1.1rem;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.blog-empty {
  margin: 2rem 0 0;
  padding: 2rem;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-muted);
  text-align: center;
}

.blog-cta-band {
  padding-block: clamp(2.5rem, 6vw, 4rem);
  background: var(--color-text);
  color: var(--color-white);
}

.blog-cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.blog-cta-band .blog-cta-label {
  color: var(--color-accent);
}

.blog-cta-band h2 {
  margin: 0.45rem 0 0;
  color: var(--color-white);
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 4vw, 2.4rem);
  letter-spacing: -0.015em;
}

.blog-cta-band p {
  max-width: 42rem;
  margin: 0.65rem 0 0;
  color: var(--color-border);
  line-height: 1.7;
}

.breadcrumb {
  width: min(calc(100% - (var(--gutter) * 2)), var(--reading-width));
  margin: 1.5rem auto 0;
  padding-top: 0.25rem;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--color-muted);
  font-size: 0.85rem;
}

.breadcrumb li:not(:last-child)::after {
  margin-left: 0.45rem;
  color: var(--color-border);
  content: "/";
}

.breadcrumb a {
  color: var(--color-accent-dark);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.post-hero {
  width: min(calc(100% - (var(--gutter) * 2)), var(--reading-width));
  margin-inline: auto;
  padding-block: clamp(2.5rem, 6vw, 4rem) clamp(2rem, 5vw, 3rem);
}

.post-hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  gap: 0.6rem 0.8rem;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.post-hero h1 {
  margin: 1rem 0 0;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 2.6rem);
  line-height: 1.22;
  letter-spacing: -0.018em;
  text-wrap: pretty;
}

.post-deck {
  margin: 1.15rem 0 0;
  color: var(--color-muted);
  font-size: clamp(1rem, 2vw, 1.12rem);
  line-height: 1.8;
}

.article-body {
  width: min(calc(100% - (var(--gutter) * 2)), var(--reading-width));
  margin-inline: auto;
  color: var(--color-text);
  font-size: 1rem;
  line-height: 1.85;
}

.article-body > :first-child {
  margin-top: 0;
}

.article-body h2 {
  margin: 2.7rem 0 1rem;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 4vw, 1.6rem);
  line-height: 1.4;
  letter-spacing: -0.012em;
  text-wrap: pretty;
}

.article-body h3 {
  margin: 2rem 0 0.8rem;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 3vw, 1.3rem);
  line-height: 1.45;
  letter-spacing: -0.008em;
  text-wrap: pretty;
}

.article-body p {
  margin: 0 0 1.25rem;
}

.article-body a {
  color: var(--color-accent-dark);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

.article-body ul,
.article-body ol {
  margin: 0 0 1.4rem;
  padding-left: 1.4rem;
}

.article-body li {
  margin-block: 0.45rem;
  padding-left: 0.25rem;
}

.article-body blockquote {
  margin: 1.8rem 0;
  padding: 1rem 1.2rem;
  border-left: 0.25rem solid var(--color-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--color-panel);
  color: var(--color-muted);
}

.article-body blockquote p:last-child {
  margin-bottom: 0;
}

.article-body pre {
  max-width: 100%;
  margin: 1.8rem 0;
  padding: 1.15rem;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-text);
  color: var(--color-panel);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.7;
}

.article-body code {
  font-family: var(--font-mono);
}

.article-body :not(pre) > code {
  padding: 0.15rem 0.35rem;
  border-radius: var(--radius-xs);
  background: var(--color-panel-strong);
  color: var(--color-accent-dark);
  font-size: 0.9em;
}

.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.article-body .table-scroll,
.article-body > .data-table {
  max-width: 100%;
  margin-block: 1.75rem;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.article-body table {
  width: 100%;
  min-width: 38rem;
  border-collapse: collapse;
  background: var(--color-white);
}

.article-body th,
.article-body td {
  padding: 0.8rem 0.9rem;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.article-body th {
  background: var(--color-panel-strong);
  font-weight: 750;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  gap: 0.8rem;
  margin: 1.8rem 0;
}

.stat-card {
  min-width: 0;
  padding: 1.15rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.stat-num {
  display: block;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 4vw, 1.8rem);
  font-weight: 800;
  line-height: 1.2;
}

.stat-label {
  display: block;
  margin-top: 0.45rem;
  color: var(--color-muted);
  font-size: 0.88rem;
  line-height: 1.55;
}

.check-list {
  margin: 1.6rem 0;
  padding: 1rem 1.2rem 1rem 2.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.check-list li {
  margin-block: 0.6rem;
}

.verdict {
  margin: 1.8rem 0;
  padding: 1rem 1.2rem;
  border-left: 0.3rem solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--color-accent-faint);
}

.verdict strong:first-child {
  color: var(--color-accent-dark);
}

.callout {
  margin: 1.8rem 0;
  padding: 1.15rem 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel-strong);
}

.callout p:last-child {
  margin-bottom: 0;
}

.promo-block {
  display: flex;
  width: min(calc(100% - (var(--gutter) * 2)), var(--reading-width));
  margin: clamp(3rem, 7vw, 5rem) auto 0;
  padding: clamp(1.4rem, 4vw, 2rem);
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at 90% 10%, var(--color-accent-soft), var(--color-transparent) 38%),
    var(--color-panel);
  box-shadow: var(--shadow-card);
}

.promo-copy h2 {
  margin: 0;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  letter-spacing: -0.012em;
}

.promo-copy p {
  margin: 0.55rem 0 0;
  color: var(--color-muted);
  line-height: 1.7;
}

.related-section {
  width: min(calc(100% - (var(--gutter) * 2)), var(--reading-width));
  margin: clamp(3rem, 7vw, 5rem) auto 0;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.related-section > h2 {
  margin: 0 0 1.2rem;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 4vw, 1.6rem);
  letter-spacing: -0.012em;
  text-wrap: pretty;
}

.related-grid {
  display: grid;
  gap: 0.85rem;
}

.related-card {
  padding: 1.2rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.related-card h3 {
  margin: 0.7rem 0 0;
  font-family: var(--font-display);
  font-size: 1.1rem;
  line-height: 1.5;
  letter-spacing: -0.008em;
  text-wrap: pretty;
}

.related-card h3 a {
  color: var(--color-text);
  text-decoration: none;
}

.related-card h3 a:hover {
  color: var(--color-accent-dark);
}

.related-card p {
  margin: 0.55rem 0 0;
  color: var(--color-muted);
  font-size: 0.92rem;
  line-height: 1.7;
}

.post-navigation {
  display: grid;
  width: min(calc(100% - (var(--gutter) * 2)), var(--reading-width));
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
  margin: 1rem auto clamp(4rem, 8vw, 7rem);
}

.post-nav-card {
  display: flex;
  min-width: 0;
  min-height: 7rem;
  padding: 1.15rem;
  flex-direction: column;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  text-decoration: none;
  transition:
    border-color 180ms ease,
    background-color 180ms ease,
    transform 180ms ease;
}

.post-nav-card:hover {
  border-color: var(--color-accent);
  background: var(--color-panel);
  transform: translateY(-2px);
}

.post-nav-label {
  margin-bottom: 0.45rem;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 750;
}

.post-nav-card strong {
  font-size: 0.95rem;
  line-height: 1.55;
  text-wrap: pretty;
}

.post-nav-next {
  grid-column: 2;
  text-align: right;
}

@media (max-width: 44rem) {
  .blog-library-heading,
  .blog-cta-inner,
  .promo-block {
    align-items: flex-start;
    flex-direction: column;
  }

  .article-card {
    grid-template-columns: minmax(0, 1fr);
  }

  .article-read-link {
    grid-column: 1;
    grid-row: auto;
    justify-self: start;
    padding-inline: 0;
  }

  .article-read-link:hover {
    background: var(--color-transparent);
  }

  .blog-cta-inner .button,
  .promo-block .button {
    width: 100%;
    justify-content: center;
  }

  .post-navigation {
    grid-template-columns: minmax(0, 1fr);
  }

  .post-nav-next {
    grid-column: 1;
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  .blog-filter,
  .article-card,
  .post-nav-card {
    transition: none;
  }
}