:root {
  --color-ink: #1e3550;
  --color-accent: #a8452f;
  --color-bg: #f7f5f1;
  --color-panel: #ffffff;
  --color-text: #2b3238;
  --color-muted: #5d6670;
  --color-line: #ded8cf;
  --color-state: #e8e2d8;
  --font-serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-sans: system-ui, -apple-system, "Segoe UI", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --shell-width: 1120px;
  --shell-pad: 24px;
  --radius: 6px;
  --shadow-soft: 0 1px 2px rgba(30, 53, 80, 0.06);
  --transition: 180ms ease;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-serif);
  color: var(--color-ink);
  font-weight: 700;
  line-height: 1.35;
}

p {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

a:hover,
a:focus-visible {
  text-decoration: underline;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

figure {
  margin: 0;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ---------- layout ---------- */

.shell {
  width: 100%;
  max-width: var(--shell-width);
  margin: 0 auto;
  padding-left: var(--shell-pad);
  padding-right: var(--shell-pad);
}

.site-main {
  display: block;
}

.inner-main {
  display: block;
}

.section {
  padding: 56px 0;
  border-top: 1px solid var(--color-line);
}

.section-head {
  max-width: 760px;
  margin-bottom: 28px;
}

.section-head .section-title,
.section-head h2 {
  font-size: 28px;
}

.section-lead,
.section-desc,
.section-intro {
  margin-top: 10px;
  max-width: 720px;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.75;
}

.section-foot,
.section-more {
  margin-top: 24px;
  font-size: 15px;
}

.text-link {
  font-weight: 600;
}

.content-section {
  padding: 40px 0;
  border-top: 1px solid var(--color-line);
}

.content-section:first-of-type {
  border-top: 0;
  padding-top: 8px;
}

.content-section .section-title,
.content-section h2 {
  font-size: 24px;
}

.content-section .section-lead,
.content-section > p {
  margin-top: 10px;
  max-width: 720px;
  color: var(--color-muted);
  font-size: 15px;
}

/* ---------- header / nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--color-panel);
  border-bottom: 1px solid var(--color-line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
  padding-top: 12px;
  padding-bottom: 12px;
}

.brand-block {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: 0;
}

.brand-name:hover {
  text-decoration: none;
  color: var(--color-accent);
}

.brand-slogan {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.5;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 10px;
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-ink);
}

.primary-nav {
  display: block;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
}

.nav-item a {
  display: block;
  padding: 8px 10px;
  color: var(--color-ink);
  font-size: 15px;
  border-bottom: 2px solid transparent;
  border-radius: 4px 4px 0 0;
  transition: color var(--transition), background var(--transition);
}

.nav-item a:hover {
  color: var(--color-accent);
  background: var(--color-state);
  text-decoration: none;
}

.nav-item.is-current a,
.nav-item a.is-current {
  color: var(--color-accent);
  background: var(--color-state);
  border-bottom-color: var(--color-accent);
  font-weight: 600;
}

/* ---------- home hero ---------- */

.hero {
  padding: 56px 0 48px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.38fr) minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}

.hero-text {
  min-width: 0;
}

.hero-eyebrow {
  font-size: 13px;
  letter-spacing: 0;
  color: var(--color-accent);
  font-weight: 600;
}

.hero h1 {
  margin-top: 12px;
  font-size: 40px;
  line-height: 1.3;
}

.hero-lead {
  margin-top: 18px;
  max-width: 640px;
  font-size: 16px;
  color: var(--color-text);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.btn {
  display: inline-block;
  min-height: 44px;
  padding: 11px 22px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  text-align: center;
  border: 1px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.btn-primary {
  background: var(--color-ink);
  color: #ffffff;
  border-color: var(--color-ink);
}

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

.btn-ghost {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-line);
}

.btn-ghost:hover {
  border-color: var(--color-ink);
  color: var(--color-accent);
  text-decoration: none;
}

.hero-index {
  margin-top: 34px;
  padding-top: 20px;
  border-top: 1px solid var(--color-line);
}

.hero-index-label {
  font-size: 13px;
  color: var(--color-muted);
}

.hero-index-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 8px 20px;
  margin-top: 12px;
}

.hero-index-list li {
  font-size: 14px;
  color: var(--color-ink);
  padding-left: 14px;
  position: relative;
}

.hero-index-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

.hero-media {
  min-width: 0;
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.hero-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.hero-media figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
  border-top: 1px solid var(--color-line);
}

/* ---------- home catalog ---------- */

.catalog-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 0;
  border-top: 1px solid var(--color-line);
}

.catalog-item {
  padding: 24px 24px 24px 0;
  border-bottom: 1px solid var(--color-line);
  min-width: 0;
}

.catalog-item:nth-child(odd) {
  padding-right: 28px;
}

.catalog-item:nth-child(even) {
  padding-left: 28px;
  border-left: 1px solid var(--color-line);
}

.catalog-no {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--color-accent);
  font-weight: 700;
}

.catalog-name {
  margin-top: 6px;
  font-size: 20px;
}

.catalog-fields {
  margin: 12px 0 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 12px;
  font-size: 14px;
}

.catalog-fields dt {
  color: var(--color-muted);
  white-space: nowrap;
}

.catalog-fields dd {
  margin: 0;
  color: var(--color-text);
}

.catalog-link {
  display: inline-block;
  margin-top: 14px;
  font-size: 14px;
  font-weight: 600;
}

/* ---------- home compare ---------- */

.segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.segment {
  min-height: 44px;
  padding: 10px 20px;
  background: var(--color-state);
  color: var(--color-ink);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  font-size: 15px;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.segment:hover {
  border-color: var(--color-ink);
}

.segment.is-active {
  background: var(--color-ink);
  color: #ffffff;
  border-color: var(--color-ink);
  font-weight: 600;
}

.compare-panels {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-panel);
}

.compare-panel {
  display: none;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.compare-panel.is-active {
  display: grid;
}

.compare-panel .panel-col {
  padding: 24px;
  min-width: 0;
  border-left: 1px solid var(--color-line);
}

.compare-panel .panel-col:first-child {
  border-left: 0;
}

.panel-col h3 {
  font-size: 17px;
}

.panel-col p {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-muted);
}

/* ---------- home section media ---------- */

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

.section-media .shell {
  padding-top: 48px;
  padding-bottom: 48px;
}

.section-media img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.section-media figcaption {
  margin-top: 12px;
  font-size: 13px;
  color: var(--color-muted);
}

/* ---------- home flow ---------- */

.flow-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.flow-step {
  min-width: 0;
  padding-top: 16px;
  border-top: 2px solid var(--color-ink);
}

.flow-no {
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
}

.flow-name {
  margin-top: 6px;
  font-size: 19px;
}

.flow-actions {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-text);
}

.flow-output {
  margin-top: 10px;
  font-size: 13px;
  color: var(--color-muted);
  padding-top: 10px;
  border-top: 1px dashed var(--color-line);
}

/* ---------- home prep ---------- */

.prep-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0 32px;
  border-top: 1px solid var(--color-line);
}

.prep-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-line);
  min-width: 0;
}

.prep-item h3 {
  font-size: 17px;
}

.prep-item p {
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-muted);
}

/* ---------- home roles ---------- */

.roles-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 40px;
}

.roles-col {
  min-width: 0;
}

.roles-col:last-child {
  padding-left: 40px;
  border-left: 1px solid var(--color-line);
}

.roles-col-title {
  font-size: 19px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
}

.roles-list {
  margin-top: 16px;
  display: grid;
  gap: 14px;
}

.roles-item {
  font-size: 15px;
  padding-left: 16px;
  position: relative;
}

.roles-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background: var(--color-ink);
  border-radius: 50%;
}

/* ---------- home faq ---------- */

.faq-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-line);
}

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

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 44px;
  padding: 16px 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--color-accent);
  line-height: 1;
}

.faq-item[open] summary::after {
  content: "–";
}

.faq-item summary:hover {
  color: var(--color-accent);
}

.faq-item > p {
  padding: 0 0 18px;
  max-width: 720px;
  font-size: 15px;
  color: var(--color-muted);
}

/* ---------- home related links ---------- */

.related-links {
  padding: 32px 0;
  border-top: 1px solid var(--color-line);
  background: var(--color-panel);
}

.related-links-label {
  font-size: 13px;
  color: var(--color-muted);
}

.related-links-item {
  margin-top: 10px;
  font-size: 15px;
}

/* ---------- inner page hero ---------- */

.page-hero {
  padding: 32px 0 8px;
}

.page-hero-inner {
  max-width: 720px;
}

.page-kicker,
.page-eyebrow {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
}

.page-summary,
.page-lead {
  margin-top: 8px;
  max-width: 720px;
  font-size: 16px;
  color: var(--color-text);
}

.page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 14px;
  font-size: 13px;
  color: var(--color-muted);
}

.meta-item {
  position: relative;
  padding-left: 14px;
}

.meta-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 5px;
  background: var(--color-line);
  border-radius: 50%;
}

/* ---------- breadcrumb / page header ---------- */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0 0;
  font-size: 13px;
  color: var(--color-muted);
}

.breadcrumb a {
  color: var(--color-accent);
}

.breadcrumb-sep {
  color: var(--color-line);
}

.breadcrumb-current {
  color: var(--color-muted);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: 13px;
  color: var(--color-muted);
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-header {
  padding: 14px 0 8px;
}

.page-title {
  font-size: 34px;
  line-height: 1.3;
}

/* ---------- inner page layout ---------- */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 48px;
  align-items: start;
  padding-top: 8px;
  padding-bottom: 48px;
}

.layout-shell {
  width: 100%;
  max-width: var(--shell-width);
  margin: 0 auto;
}

.page-body,
.page-content,
.layout-main {
  min-width: 0;
}

.page-aside,
.layout-aside,
.page-toc {
  min-width: 0;
  position: sticky;
  top: 96px;
}

/* sidebar-left: aside first, then main */

.sidebar-left .page-layout,
.page-layout.sidebar-left,
.sidebar-left.page-layout {
  grid-template-columns: 240px minmax(0, 1fr);
}

.sidebar-left .page-aside,
.sidebar-left .page-toc,
.sidebar-left .layout-aside {
  order: 0;
}

.sidebar-left .page-content,
.sidebar-left .page-body,
.sidebar-left .layout-main {
  order: 1;
}

.sidebar-left .page-aside,
.sidebar-left .page-toc,
.sidebar-left .layout-aside {
  position: sticky;
  top: 96px;
}

/* ---------- toc / aside ---------- */

.toc,
.page-aside,
.layout-aside {
  font-size: 14px;
}

.toc-title,
.toc-label,
.aside-title {
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--color-ink);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line);
  margin-bottom: 12px;
}

.toc-list,
.anchor-list {
  display: grid;
  gap: 8px;
}

.toc-list a,
.anchor-list a {
  display: block;
  padding: 6px 0;
  color: var(--color-ink);
  font-size: 14px;
  line-height: 1.5;
  border-left: 2px solid transparent;
  padding-left: 10px;
}

.toc-list a:hover,
.anchor-list a:hover {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
  text-decoration: none;
}

.toc-list a.is-active,
.anchor-list a.is-active {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
  font-weight: 600;
}

.aside-note {
  margin-top: 20px;
  padding: 16px;
  background: var(--color-state);
  border-radius: var(--radius);
  font-size: 13px;
  color: var(--color-muted);
}

.aside-note h3 {
  font-size: 15px;
  margin-bottom: 8px;
}

.aside-note a {
  display: inline-block;
  margin-top: 10px;
  font-weight: 600;
}

/* ---------- figures ---------- */

.content-figure,
.compare-figure,
.media-figure,
.page-figure {
  margin: 0 0 28px;
}

.content-figure img,
.compare-figure img,
.media-figure img,
.page-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.page-figure {
  padding-top: 8px;
  padding-bottom: 8px;
}

.figure-caption,
figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
}

/* ---------- catalog inner page ---------- */

.catalog-list .catalog-item {
  padding: 26px 0;
}

.catalog-list .catalog-item:nth-child(odd),
.catalog-list .catalog-item:nth-child(even) {
  padding-left: 0;
  padding-right: 0;
  border-left: 0;
}

.catalog-list .catalog-link {
  margin-top: 12px;
}

/* ---------- field list ---------- */

.field-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0 32px;
  border-top: 1px solid var(--color-line);
}

.field-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-line);
  min-width: 0;
}

.field-name {
  font-size: 17px;
}

.field-desc {
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-muted);
}

/* ---------- recommend grid ---------- */

.recommend-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.recommend-item {
  min-width: 0;
  padding: 22px;
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.recommend-name {
  font-size: 18px;
}

.recommend-items,
.recommend-fit {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-muted);
}

.recommend-label {
  font-size: 13px;
  color: var(--color-ink);
  font-weight: 600;
}

/* ---------- depend list ---------- */

.depend-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-line);
}

.depend-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-line);
}

.depend-pair {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
}

.depend-before,
.depend-after {
  color: var(--color-ink);
}

.depend-arrow {
  color: var(--color-accent);
  padding: 0 8px;
}

.depend-reason {
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-muted);
}

/* ---------- service compare page ---------- */

.goal-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.goal-card {
  min-width: 0;
  padding: 22px;
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.goal-name {
  font-size: 18px;
}

.goal-trigger,
.goal-form {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-muted);
}

.compare-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-panel);
  overflow: hidden;
}

.compare-col {
  min-width: 0;
  padding: 24px;
  border-left: 1px solid var(--color-line);
}

.compare-col:first-child {
  border-left: 0;
}

.compare-col-title {
  font-size: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
}

.compare-fields {
  margin: 14px 0 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 12px;
  font-size: 14px;
}

.compare-fields dt {
  color: var(--color-muted);
  white-space: nowrap;
}

.compare-fields dd {
  margin: 0;
  color: var(--color-text);
}

.compare-figure {
  margin-top: 28px;
}

.selfcheck-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 32px;
  border-top: 1px solid var(--color-line);
}

.selfcheck-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--color-line);
  min-width: 0;
}

.selfcheck-q {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
}

.selfcheck-a {
  margin-top: 6px;
  font-size: 14px;
  color: var(--color-muted);
}

.adjust-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.adjust-item {
  min-width: 0;
  padding: 22px;
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.adjust-name {
  font-size: 17px;
}

.adjust-desc {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-muted);
}

/* ---------- delivery checklist page ---------- */

.check-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-line);
}

.check-item {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--color-line);
}

.check-main {
  min-width: 0;
}

.check-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
}

.check-desc {
  margin-top: 6px;
  font-size: 14px;
  color: var(--color-muted);
}

.check-note {
  min-width: 0;
  padding-left: 20px;
  border-left: 1px solid var(--color-line);
  font-size: 14px;
  color: var(--color-muted);
}

.check-note-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 4px;
}

.step-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-ink);
}

.omission-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-line);
}

.omission-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-line);
}

.omission-title {
  font-size: 17px;
}

.omission-step {
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-muted);
  padding-left: 16px;
  position: relative;
}

.omission-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--color-line);
  border-radius: 50%;
}

/* ---------- opening flow page ---------- */

.flow-overview {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  margin-bottom: 28px;
}

.flow-overview-item {
  min-width: 0;
  padding-top: 16px;
  border-top: 2px solid var(--color-ink);
}

.flow-index {
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
}

.flow-overview-item .flow-name {
  margin-top: 6px;
  font-size: 18px;
}

.flow-overview-item p {
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-muted);
}

.flow-stage {
  padding: 24px 0;
  border-bottom: 1px solid var(--color-line);
}

.flow-stage-head {
  max-width: 720px;
}

.flow-stage-head .flow-name {
  margin-top: 6px;
  font-size: 19px;
}

.flow-stage-desc {
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-muted);
}

.flow-stage-cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
  margin-top: 18px;
}

.flow-col {
  min-width: 0;
  padding: 16px 18px;
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  font-size: 14px;
}

.flow-col-client {
  border-left: 3px solid var(--color-ink);
}

.flow-col-service {
  border-left: 3px solid var(--color-accent);
}

.flow-stage .flow-output {
  margin-top: 16px;
  max-width: 720px;
}

.dependency-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-line);
}

.dependency-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--color-line);
}

.dependency-item h3 {
  font-size: 17px;
}

.dependency-item p {
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-muted);
  max-width: 720px;
}

.change-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.change-item {
  min-width: 0;
  padding: 22px;
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.change-item h3 {
  font-size: 17px;
}

.change-item p {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-muted);
}

.related-nav {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--color-line);
}

.related-nav-title {
  font-size: 18px;
}

.related-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px 24px;
  margin-top: 14px;
  font-size: 15px;
}

/* ---------- project roles page ---------- */

.role-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.role-card {
  min-width: 0;
  padding: 22px;
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.role-name {
  font-size: 18px;
}

.role-duty,
.role-timing,
.role-need,
.role-output {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-muted);
}

.roles-client .role-grid--client .role-card {
  border-top: 3px solid var(--color-ink);
}

.roles-vendor .role-grid--vendor .role-card {
  border-top: 3px solid var(--color-accent);
}

.mechanism-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-line);
}

.mechanism-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--color-line);
}

.mechanism-title {
  font-size: 17px;
}

.mechanism-desc {
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-muted);
  max-width: 720px;
}

.friction-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.friction-item {
  min-width: 0;
  padding: 22px;
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.friction-title {
  font-size: 17px;
}

.friction-symptom,
.friction-cause,
.friction-fix {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-muted);
}

/* ---------- faq page ---------- */

.faq-section {
  padding: 40px 0;
  border-top: 1px solid var(--color-line);
}

.faq-section h2 {
  font-size: 24px;
}

.faq-section .section-lead {
  margin-top: 10px;
  max-width: 720px;
  color: var(--color-muted);
  font-size: 15px;
}

.faq-section .faq-list,
.faq-section details.faq-item {
  margin-top: 16px;
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 44px;
  padding: 14px 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--color-accent);
  line-height: 1;
}

.faq-item[open] .faq-question::after {
  content: "–";
}

.faq-question:hover {
  color: var(--color-accent);
}

.faq-answer {
  padding-bottom: 16px;
  max-width: 720px;
}

.faq-answer p {
  font-size: 15px;
  color: var(--color-muted);
}

/* ---------- adjustment guide page ---------- */

.symptom-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-line);
}

.symptom-item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-line);
  align-items: baseline;
}

.symptom-no {
  grid-row: span 2;
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
}

.symptom-name {
  font-size: 16px;
  color: var(--color-ink);
}

.symptom-desc {
  font-size: 14px;
  color: var(--color-muted);
}

.cause-flow {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-line);
}

.cause-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-line);
}

.cause-item h3 {
  font-size: 17px;
}

.cause-check {
  margin-top: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
}

.cause-detail {
  margin-top: 6px;
  font-size: 14px;
  color: var(--color-muted);
}

.scope-table {
  display: grid;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-panel);
  overflow: hidden;
}

.scope-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr) minmax(0, 1.2fr);
}

.scope-row > span {
  padding: 14px 18px;
  font-size: 14px;
  border-top: 1px solid var(--color-line);
  border-left: 1px solid var(--color-line);
  min-width: 0;
}

.scope-row > span:first-child {
  border-left: 0;
}

.scope-head > span {
  border-top: 0;
  background: var(--color-state);
  font-weight: 600;
  color: var(--color-ink);
}

.rescop-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.rescop-item {
  min-width: 0;
  padding: 22px;
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.rescop-item h3 {
  font-size: 17px;
}

.rescop-item p {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-muted);
}

.section-footnote {
  margin-top: 24px;
  font-size: 14px;
}

.section-footnote a {
  margin-right: 16px;
  font-weight: 600;
}

/* ---------- archive nav ---------- */

.archive-nav,
.archive-section {
  padding: 40px 0;
  border-top: 1px solid var(--color-line);
}

.archive-title,
.archive-nav-title {
  font-size: 20px;
}

.archive-label {
  font-size: 13px;
  color: var(--color-muted);
}

.archive-list,
.archive-nav-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px 24px;
  margin-top: 14px;
  font-size: 15px;
}

.archive-item {
  min-width: 0;
}

/* ---------- 404 ---------- */

.error-main {
  padding: 72px 0;
}

.error-inner {
  max-width: 720px;
}

.error-code {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-accent);
}

.error-inner h1 {
  margin-top: 12px;
  font-size: 34px;
}

.error-lead {
  margin-top: 14px;
  font-size: 16px;
  color: var(--color-muted);
}

.error-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px 24px;
  margin-top: 26px;
  font-size: 15px;
}

.error-actions {
  margin-top: 28px;
}

/* ---------- footer ---------- */

.site-footer {
  margin-top: 24px;
  background: var(--color-panel);
  border-top: 1px solid var(--color-line);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 1fr));
  gap: 32px;
  padding-top: 44px;
  padding-bottom: 32px;
}

.footer-brand {
  min-width: 0;
}

.footer-brand-name {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-ink);
}

.footer-brand-desc {
  margin-top: 10px;
  max-width: 320px;
  font-size: 14px;
  color: var(--color-muted);
}

.footer-col {
  min-width: 0;
  font-size: 14px;
}

.footer-col-title {
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--color-ink);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line);
  margin-bottom: 12px;
}

.footer-col ul {
  display: grid;
  gap: 8px;
}

.footer-col a {
  color: var(--color-muted);
}

.footer-col a:hover {
  color: var(--color-accent);
}

.footer-anchors {
  padding-top: 18px;
  padding-bottom: 18px;
  border-top: 1px solid var(--color-line);
}

.footer-anchors-label {
  font-size: 13px;
  color: var(--color-muted);
}

.footer-anchors ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 10px;
  font-size: 14px;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  padding-top: 18px;
  padding-bottom: 28px;
  border-top: 1px solid var(--color-line);
  font-size: 13px;
  color: var(--color-muted);
}

.footer-copy,
.footer-note {
  min-width: 0;
}

/* ---------- responsive ---------- */

@media (max-width: 1080px) {
  .hero h1 {
    font-size: 34px;
  }

  .hero-inner {
    gap: 36px;
  }

  .page-layout,
  .sidebar-left .page-layout,
  .page-layout.sidebar-left,
  .sidebar-left.page-layout {
    grid-template-columns: minmax(0, 1fr) 210px;
    gap: 32px;
  }

  .sidebar-left .page-layout,
  .page-layout.sidebar-left,
  .sidebar-left.page-layout {
    grid-template-columns: 210px minmax(0, 1fr);
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
  }

  .goal-grid,
  .compare-grid,
  .role-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

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

  .compare-grid .compare-col:nth-child(3) {
    border-left: 0;
    border-top: 1px solid var(--color-line);
  }
}

@media (max-width: 768px) {
  :root {
    --shell-pad: 16px;
  }

  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
    min-height: 64px;
  }

  .nav-toggle {
    display: flex;
    margin-left: auto;
  }

  .primary-nav {
    flex: 1 0 100%;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 12px;
    border-top: 1px solid var(--color-line);
  }

  .nav-list.is-open {
    display: flex;
  }

  .nav-item a {
    padding: 12px 8px;
    border-bottom: 1px solid var(--color-line);
    border-radius: 0;
  }

  .hero {
    padding: 36px 0 32px;
  }

  .hero h1 {
    font-size: 28px;
  }

  .hero-lead {
    font-size: 15px;
  }

  .hero-actions .btn {
    flex: 1 1 auto;
  }

  .hero-index-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .section {
    padding: 40px 0;
  }

  .section-head .section-title,
  .section-head h2 {
    font-size: 22px;
  }

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

  .catalog-item,
  .catalog-item:nth-child(odd),
  .catalog-item:nth-child(even) {
    padding: 20px 0;
    border-left: 0;
  }

  .compare-panel,
  .compare-panel.is-active {
    grid-template-columns: minmax(0, 1fr);
  }

  .compare-panel .panel-col {
    border-left: 0;
    border-top: 1px solid var(--color-line);
  }

  .compare-panel .panel-col:first-child {
    border-top: 0;
  }

  .section-media img {
    aspect-ratio: 16 / 9;
  }

  .flow-steps,
  .prep-list,
  .field-list,
  .recommend-grid,
  .adjust-list,
  .change-list,
  .flow-overview,
  .selfcheck-list,
  .friction-list,
  .rescop-list,
  .role-grid,
  .goal-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .roles-columns {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .roles-col:last-child {
    padding-left: 0;
    border-left: 0;
    padding-top: 24px;
    border-top: 1px solid var(--color-line);
  }

  .page-title {
    font-size: 26px;
  }

  .error-inner h1 {
    font-size: 26px;
  }

  .content-section .section-title,
  .content-section h2,
  .faq-section h2 {
    font-size: 21px;
  }

  /* inner layout: single column, main content first */

  .page-layout,
  .sidebar-left .page-layout,
  .page-layout.sidebar-left,
  .sidebar-left.page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding-bottom: 32px;
  }

  .page-aside,
  .layout-aside,
  .page-toc,
  .sidebar-left .page-aside,
  .sidebar-left .page-toc,
  .sidebar-left .layout-aside {
    position: static;
    order: 2;
    padding-top: 20px;
    border-top: 1px solid var(--color-line);
  }

  .page-content,
  .page-body,
  .layout-main,
  .sidebar-left .page-content,
  .sidebar-left .page-body,
  .sidebar-left .layout-main {
    order: 1;
  }

  .toc-list,
  .anchor-list {
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  }

  .check-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .check-note {
    padding-left: 0;
    border-left: 0;
    padding-top: 10px;
    border-top: 1px dashed var(--color-line);
  }

  .flow-stage-cols {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

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

  .compare-grid .compare-col,
  .compare-grid .compare-col:nth-child(3) {
    border-left: 0;
    border-top: 1px solid var(--color-line);
  }

  .compare-grid .compare-col:first-child {
    border-top: 0;
  }

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

  .scope-row > span {
    border-left: 0;
  }

  .scope-head {
    display: none;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding-top: 32px;
  }

  .footer-brand-desc {
    max-width: none;
  }

  .footer-bottom {
    flex-direction: column;
  }
}

@media (max-width: 420px) {
  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .segment {
    flex: 1 1 auto;
    padding: 10px 14px;
    font-size: 14px;
  }

  .page-title {
    font-size: 24px;
  }

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

  .symptom-no {
    grid-row: auto;
  }
}