:root {
  --ink: #17201d;
  --ink-soft: #31413c;
  --muted: #66736f;
  --paper: #f6f7f2;
  --surface: #ffffff;
  --surface-soft: #eef3ef;
  --line: #d8ded8;
  --teal: #0f766e;
  --teal-dark: #0b4f49;
  --amber: #b7791f;
  --clay: #9f5135;
  --shadow: 0 18px 48px rgba(23, 32, 29, 0.1);
  --site-width: 1120px;
  --read-width: 820px;
  --frame: min(calc(100% - 48px), var(--site-width));
  --content-frame: min(calc(100% - 48px), var(--read-width));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", system-ui, sans-serif;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(246, 247, 242, 0.9);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.header-inner,
.section,
.site-footer {
  width: var(--frame);
  margin: 0 auto;
}

.header-inner {
  width: var(--content-frame);
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}

.brand span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

.nav {
  display: flex;
  gap: 24px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.nav a {
  text-decoration: none;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--ink);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(380px, 1.1fr);
  gap: 56px;
  align-items: center;
  width: var(--frame);
  min-height: calc(100vh - 68px);
  margin: 0 auto;
  padding: 72px 0 84px;
}

.page-hero {
  grid-template-columns: minmax(0, 0.9fr) minmax(340px, 0.82fr);
  gap: 52px;
  min-height: auto;
  padding: 82px 0 54px;
  border-bottom: 1px solid var(--line);
}

.page-hero .hero-copy {
  max-width: 900px;
}

.hero-panel {
  align-self: stretch;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 330px;
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.hero-panel h2 {
  margin: 0;
  color: var(--ink);
  font-family: "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
  font-size: 30px;
  line-height: 1.25;
}

.hero-panel p {
  margin: 18px 0 0;
  color: var(--ink-soft);
  line-height: 1.75;
}

.hero-panel ul {
  display: grid;
  gap: 10px;
  margin: 24px 0 0;
  padding-left: 20px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.hero-panel .tag-list {
  margin-top: 24px;
}

.eyebrow,
.card-kicker {
  margin: 0 0 14px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1,
.page-hero h1 {
  max-width: 760px;
  margin: 0;
  color: var(--ink);
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, serif;
  font-size: clamp(42px, 5.8vw, 76px);
  line-height: 1.08;
  letter-spacing: 0;
}

.page-hero h1 {
  max-width: 900px;
  font-size: clamp(38px, 4.5vw, 62px);
}

.lead {
  max-width: 720px;
  margin: 26px 0 0;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.9;
}

.actions,
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--ink);
  border-radius: 6px;
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
}

.button.primary {
  background: var(--ink);
  color: #fff;
}

.button.secondary {
  background: transparent;
  color: var(--ink);
}

.button:hover {
  transform: translateY(-1px);
}

.hero-visual {
  position: relative;
  margin: 0;
}

.hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.proof-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  overflow: hidden;
  margin-top: -34px;
  background: var(--ink);
  border-radius: 8px;
  color: #fff;
}

.proof-strip div {
  min-height: 102px;
  padding: 22px;
  border-right: 1px solid rgba(255, 255, 255, 0.14);
}

.proof-strip div:last-child {
  border-right: 0;
}

.proof-strip strong {
  display: block;
  font-family: "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
  font-size: 28px;
  line-height: 1;
}

.proof-strip span {
  display: block;
  margin-top: 10px;
  color: #cbd5cf;
  font-size: 13px;
  line-height: 1.5;
}

.section {
  padding: 86px 0;
  border-top: 1px solid var(--line);
}

.section.alt {
  background: var(--surface-soft);
  box-shadow: 0 0 0 100vmax var(--surface-soft);
  clip-path: inset(0 -100vmax);
}

.section.dark {
  background: var(--ink);
  box-shadow: 0 0 0 100vmax var(--ink);
  clip-path: inset(0 -100vmax);
  color: #fff;
}

.section-head {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 48px;
  margin-bottom: 34px;
}

.section-head h2 {
  margin: 0;
  font-family: "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
  font-size: clamp(30px, 3.4vw, 46px);
  line-height: 1.18;
}

.section-head p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.8;
}

.dark .section-head p,
.dark .eyebrow {
  color: #cbd5cf;
}

.capability-grid,
.case-grid,
.post-grid,
.service-grid {
  display: grid;
  gap: 18px;
}

.capability-grid {
  grid-template-columns: repeat(3, 1fr);
}

.case-grid,
.post-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.service-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.capability-card,
.case-card,
.blog-card,
.service-card,
.note-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 10px 26px rgba(23, 32, 29, 0.04);
}

.capability-card,
.service-card,
.note-card {
  padding: 24px;
}

.capability-card h3,
.service-card h3,
.case-card h3,
.blog-card h2,
.note-card h3 {
  margin: 0;
  color: var(--ink);
  font-family: "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
  font-size: 23px;
  line-height: 1.3;
}

.capability-card p,
.service-card p,
.case-card p,
.blog-card p,
.note-card p {
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.75;
}

.case-card {
  display: block;
  min-height: 260px;
  padding: 22px;
  color: var(--ink);
  text-decoration: none;
}

.case-card span,
.case-study-label {
  display: inline-flex;
  margin-bottom: 16px;
  color: var(--clay);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.case-card:hover,
.blog-card:hover {
  border-color: rgba(15, 118, 110, 0.55);
  transform: translateY(-2px);
}

.post-list .blog-card:hover {
  border-color: var(--line);
  transform: none;
}

.blog-card {
  min-height: 0;
  padding: 28px 0;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  box-shadow: none;
}

.blog-card a {
  text-decoration: none;
}

.blog-card a:hover {
  text-decoration: underline;
  text-underline-offset: 5px;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  align-items: center;
  margin-top: 14px;
  color: var(--muted);
  font-size: 12px;
}

.blog-card .post-meta {
  display: inline-flex;
  flex-wrap: nowrap;
  white-space: nowrap;
}

.blog-card .post-meta time,
.blog-card .post-meta span {
  display: inline;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.tag-list span {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 9px;
  background: rgba(15, 118, 110, 0.08);
  border: 1px solid rgba(15, 118, 110, 0.18);
  border-radius: 999px;
  color: var(--teal-dark);
  font-size: 12px;
  font-weight: 800;
}

.breadcrumb {
  display: flex;
  gap: 6px;
  align-items: center;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 700;
}

.breadcrumb a {
  color: var(--teal-dark);
  text-underline-offset: 4px;
}

.inline-tags {
  margin-top: 0;
}

.blog-index {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 46px;
}

.blog-page {
  padding-top: 0;
}

.page-first-section {
  max-width: var(--read-width);
  padding-top: 18px;
}

.content-column {
  width: var(--content-frame);
  margin: 0 auto;
}

.page-heading {
  width: var(--content-frame);
  margin: 0 auto;
  padding: 52px 0 18px;
}

.content-column .page-heading {
  width: auto;
  margin: 0;
}

.page-heading h1 {
  margin: 0;
  color: var(--ink);
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, serif;
  font-size: 30px;
  line-height: 1.25;
}

.page-heading p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.blog-index .section-heading {
  position: sticky;
  top: 104px;
  align-self: start;
}

.blog-index h1,
.section-heading h1,
.section-heading h2 {
  margin: 0;
  font-family: "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
  font-size: 42px;
}

.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 22px;
}

.blog-filters button {
  min-height: 36px;
  padding: 0 13px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  font-weight: 800;
}

.blog-filters button:hover,
.blog-filters button[aria-current] {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}

.blog-list {
  display: grid;
  gap: 18px;
}

.post-list {
  width: var(--content-frame);
  margin: 0 auto;
  padding: 18px 0 56px;
  border-top: 1px solid var(--line);
}

.content-column .post-list {
  width: auto;
  margin: 0;
}

.blog-article {
  display: block;
}

.blog-article article {
  max-width: var(--read-width);
  margin: 0 auto;
}

.blog-article h1 {
  margin: 24px 0 18px;
  font-family: "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
  font-size: clamp(32px, 4.2vw, 48px);
  line-height: 1.18;
}

.blog-article .markdown-panel h1:first-child {
  display: none;
}

.markdown-panel {
  max-width: var(--read-width);
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.95;
}

.markdown-panel h1 {
  margin: 0 0 24px;
  color: var(--ink);
  font-family: "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
  font-size: 36px;
}

.markdown-panel h2 {
  margin: 38px 0 12px;
  color: var(--ink);
  font-family: "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
  font-size: 27px;
  scroll-margin-top: 96px;
}

.markdown-panel h3 {
  margin: 28px 0 10px;
  color: var(--ink);
  font-size: 21px;
  scroll-margin-top: 96px;
}

.markdown-panel p {
  margin: 0 0 16px;
}

.markdown-panel ul,
.markdown-panel ol {
  display: grid;
  gap: 8px;
  margin: 0 0 22px;
  padding-left: 24px;
}

.markdown-panel a,
.back-link {
  color: var(--teal-dark);
  font-weight: 800;
  text-underline-offset: 5px;
}

.markdown-panel blockquote {
  margin: 28px 0;
  padding: 8px 0 8px 18px;
  border-left: 4px solid var(--teal);
  color: var(--ink-soft);
}

.markdown-panel pre {
  overflow-x: auto;
  margin: 24px 0;
  padding: 18px;
  background: var(--ink);
  border-radius: 8px;
  color: #f8fafc;
  font-size: 14px;
  line-height: 1.7;
}

.article-toc[hidden] {
  display: none;
}

.article-toc {
  position: fixed;
  top: 50%;
  left: calc(50% + (var(--read-width) / 2) + 34px);
  z-index: 25;
  width: 268px;
  max-height: min(68vh, 520px);
  color: var(--muted);
  transform: translateY(-50%);
}

.toc-rail {
  position: absolute;
  top: 8px;
  left: 0;
  width: 1px;
  height: 170px;
  background: repeating-linear-gradient(
    to bottom,
    #d7ddd7 0,
    #d7ddd7 8px,
    transparent 8px,
    transparent 16px
  );
}

.toc-panel {
  overflow: auto;
  max-height: inherit;
  margin-left: 14px;
  padding: 8px 10px 12px 0;
  background: rgba(246, 247, 242, 0.96);
  opacity: 0;
  pointer-events: none;
  transform: translateX(8px);
  transition: opacity 160ms ease, transform 160ms ease, visibility 160ms ease;
  visibility: hidden;
}

.article-toc:hover .toc-panel,
.article-toc:focus-within .toc-panel,
.article-toc.is-pinned .toc-panel {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(0);
  visibility: visible;
}

.article-toc:hover .toc-rail,
.article-toc:focus-within .toc-rail,
.article-toc.is-pinned .toc-rail {
  background: #e0e4df;
}

.toc-pin {
  position: sticky;
  top: 0;
  display: block;
  width: 26px;
  height: 26px;
  margin: 0 auto 6px;
  padding: 0;
  background: rgba(246, 247, 242, 0.92);
  border: 0;
  color: #a0a6a2;
  cursor: pointer;
}

.toc-pin::before,
.toc-pin::after {
  position: absolute;
  content: "";
}

.toc-pin::before {
  top: 7px;
  left: 10px;
  width: 8px;
  height: 8px;
  border-top: 2px solid currentColor;
  border-left: 2px solid currentColor;
  transform: rotate(45deg);
}

.toc-pin::after {
  top: 12px;
  left: 13px;
  width: 2px;
  height: 8px;
  background: currentColor;
  transform: rotate(-35deg);
  transform-origin: top center;
}

.toc-pin:hover,
.toc-pin[aria-pressed="true"] {
  color: var(--teal-dark);
}

.toc-list {
  display: grid;
  gap: 0;
}

.toc-link {
  position: relative;
  display: block;
  overflow: hidden;
  min-height: 29px;
  padding: 4px 8px 4px 16px;
  border-left: 1px solid #e2e6e1;
  color: #737d79;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.5;
  text-decoration: none;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.toc-link.depth-3 {
  padding-left: 26px;
  font-size: 13px;
  font-weight: 650;
}

.toc-link:hover,
.toc-link.is-active {
  color: #e11d2e;
}

.toc-link.is-active::before {
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: -1px;
  width: 2px;
  background: #ff1f2d;
  content: "";
}

.case-study {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  padding: 34px 0;
  border-top: 1px solid var(--line);
}

.case-study:first-child {
  border-top: 0;
  padding-top: 0;
}

.case-study h2 {
  margin: 0;
  font-family: "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
  font-size: 25px;
  line-height: 1.22;
}

.case-study-meta {
  display: grid;
  gap: 6px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 13px;
}

.case-study-body {
  display: grid;
  gap: 18px;
}

.case-study-body h3 {
  margin: 0 0 8px;
  color: var(--teal-dark);
  font-size: 16px;
}

.case-study-body p,
.case-study-body li {
  color: var(--ink-soft);
  line-height: 1.8;
}

.case-study-body p {
  margin: 0;
}

.case-study-body ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 20px;
}

.resume-page {
  width: var(--content-frame);
  margin: 0 auto;
  padding: 18px 0 64px;
  border-top: 1px solid var(--line);
}

.resume-block {
  padding: 28px 0;
  border-top: 1px solid var(--line);
}

.resume-block:first-child {
  border-top: 0;
}

.resume-block h2 {
  margin: 0 0 12px;
  font-family: "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
  font-size: 23px;
  line-height: 1.28;
}

.resume-block p,
.resume-block li {
  color: var(--ink-soft);
  line-height: 1.85;
}

.resume-block p {
  margin: 0 0 8px;
}

.resume-block ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 20px;
}

.resume-block a {
  color: var(--teal-dark);
  font-weight: 800;
  text-underline-offset: 5px;
}

.two-column {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 42px;
  align-items: center;
}

.dark h2 {
  max-width: 760px;
  margin: 0;
  font-family: "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
  font-size: clamp(30px, 4vw, 50px);
  line-height: 1.18;
}

.dark .button.secondary {
  border-color: rgba(255, 255, 255, 0.48);
  color: #fff;
}

.dark .button.primary {
  background: #fff;
  border-color: #fff;
  color: var(--ink);
}

.site-footer {
  padding: 24px 0 28px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
  line-height: 1.7;
  text-align: center;
}

.site-footer p {
  margin: 0;
}

.back-to-top {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: #e5e2dc;
  border: 0;
  border-radius: 999px;
  opacity: 0;
  pointer-events: none;
  text-decoration: none;
  transform: translateY(8px);
  transition: opacity 160ms ease, transform 160ms ease, background 160ms ease;
}

.back-to-top::before {
  width: 0;
  height: 0;
  border-right: 9px solid transparent;
  border-bottom: 10px solid #8f8d87;
  border-left: 9px solid transparent;
  content: "";
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  background: #d8d5cf;
}

@media (max-width: 1180px) {
  .article-toc {
    display: none;
  }
}

@media (max-width: 920px) {
  :root {
    --frame: min(calc(100% - 32px), var(--site-width));
    --content-frame: min(calc(100% - 32px), var(--read-width));
  }

  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
    padding: 16px 0;
  }

  .nav {
    flex-wrap: wrap;
    gap: 12px 18px;
  }

  .hero,
  .section-head,
  .blog-index,
  .case-study,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    gap: 34px;
    padding: 48px 0 62px;
  }

  .hero h1,
  .page-hero h1 {
    font-size: 40px;
  }

  .proof-strip,
  .capability-grid,
  .case-grid,
  .post-grid,
  .service-grid,
  .two-column {
    grid-template-columns: 1fr;
  }

  .proof-strip {
    margin-top: 0;
  }

  .blog-index .section-heading {
    position: static;
  }
}

@media (max-width: 560px) {
  .hero h1,
  .page-hero h1 {
    font-size: 34px;
  }

  .blog-article h1 {
    font-size: 30px;
  }

  .lead,
  .markdown-panel {
    font-size: 16px;
  }

  .button {
    width: 100%;
  }

  .back-to-top {
    right: 16px;
    bottom: 16px;
    width: 38px;
    height: 38px;
  }
}