:root {
  --ink: #15181c;
  --paper: #f6f3ec;
  --sand: #e8e2d6;
  --signal: #b8431a;
  --graphite: #3d4a52;
  --white: #ffffff;
  --line: rgba(61, 74, 82, 0.22);
  --line-strong: rgba(61, 74, 82, 0.42);
  --shell: 1120px;
  --narrow: 720px;
  --radius: 6px;
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
}

/* ============================================================
   base
   ============================================================ */

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

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

body.site-body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  background-color: var(--paper);
  font-variant-numeric: tabular-nums;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 800;
  line-height: 1.3;
  color: var(--ink);
}

p {
  margin: 0;
}

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

a {
  color: var(--ink);
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease, transform 160ms ease;
}

a:hover {
  color: var(--signal);
}

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

figure {
  margin: 0;
}

figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--graphite);
}

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  text-align: left;
  vertical-align: top;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

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

/* ============================================================
   layout
   ============================================================ */

.site-main {
  display: block;
}

.layout-shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 32px;
}

.layout-narrow {
  max-width: 860px;
}

.inner-main {
  padding-bottom: 24px;
}

.breadcrumb {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 28px 32px 0;
  font-size: 13px;
  color: var(--graphite);
}

.breadcrumb a {
  color: var(--graphite);
  border-bottom: 1px solid transparent;
}

.breadcrumb a:hover {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.breadcrumb-sep {
  margin: 0 8px;
  color: var(--line-strong);
}

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

.page-header {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 40px 32px 0;
}

.page-title {
  max-width: 880px;
  font-size: 40px;
  font-weight: 800;
  line-height: 1.25;
}

.page-hero {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 20px 32px 0;
}

.page-hero-inner {
  max-width: var(--narrow);
}

.page-kicker,
.page-tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 2px 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--signal);
  border: 1px solid rgba(184, 67, 26, 0.4);
  border-radius: var(--radius);
}

.page-lead {
  max-width: var(--narrow);
  font-size: 16px;
  color: var(--graphite);
}

.section-head {
  max-width: var(--narrow);
  margin-bottom: 32px;
}

.section-title {
  font-size: 28px;
  font-weight: 800;
}

.section-sub,
.section-note,
.section-intro {
  margin-top: 12px;
  font-size: 15px;
  color: var(--graphite);
}

.section-intro {
  max-width: var(--narrow);
  margin-bottom: 32px;
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 56px;
  align-items: start;
  margin-top: 48px;
}

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

.standard-aside {
  position: sticky;
  top: 88px;
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

/* ============================================================
   components
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease, transform 160ms ease;
}

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

.btn-solid {
  color: var(--white);
  background: var(--signal);
  border-color: var(--signal);
}

.btn-solid:hover {
  color: var(--white);
  background: #9d3815;
  border-color: #9d3815;
}

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

.btn-outline:hover {
  color: var(--signal);
  border-color: var(--signal);
}

.link-more {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 15px;
  font-weight: 600;
  color: var(--signal);
  border-bottom: 1px solid var(--signal);
}

.link-more:hover {
  color: #9d3815;
  border-bottom-color: #9d3815;
}

.entry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.entry-card {
  display: block;
  padding: 22px 22px 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 160ms ease, transform 160ms ease;
}

.entry-card:hover {
  border-color: var(--signal);
  transform: translateY(-2px);
}

.entry-name,
.entry-title {
  display: block;
  font-size: 18px;
  font-weight: 800;
}

.entry-desc {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  color: var(--graphite);
}

/* ============================================================
   site header
   ============================================================ */

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

.header-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  width: 100%;
  max-width: var(--shell);
  min-height: 72px;
  margin: 0 auto;
  padding: 0 32px;
}

.brand {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
}

.brand-mark {
  font-size: 19px;
  font-weight: 800;
  color: var(--ink);
}

.primary-nav {
  flex: 1 1 auto;
}

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

.nav-item {
  position: relative;
}

.nav-item > a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  border-bottom: 2px solid transparent;
}

.nav-item > a:hover {
  color: var(--signal);
}

.nav-item > a.is-current {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.nav-panel {
  position: absolute;
  top: 100%;
  left: 0;
  display: none;
  gap: 24px;
  min-width: 320px;
  padding: 20px 22px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 12px 28px rgba(21, 24, 28, 0.08);
}

.nav-item.has-panel:hover .nav-panel,
.nav-item.has-panel:focus-within .nav-panel {
  display: flex;
}

.panel-col {
  display: flex;
  flex-direction: column;
  min-width: 132px;
}

.panel-title {
  margin-bottom: 8px;
  font-size: 13px;
  font-weight: 800;
  color: var(--graphite);
}

.panel-col a {
  display: block;
  padding: 6px 0;
  font-size: 14px;
  color: var(--ink);
}

.panel-col a:hover {
  color: var(--signal);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

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

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

.mobile-nav {
  border-top: 1px solid var(--line);
  background: var(--white);
}

.mobile-nav[hidden] {
  display: none;
}

.mobile-nav-list {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 8px 32px 20px;
}

.mobile-nav-list > li > a {
  display: flex;
  align-items: center;
  min-height: 44px;
  font-size: 16px;
  font-weight: 600;
  border-bottom: 1px solid var(--line);
}

.mobile-group {
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
}

.mobile-group-title {
  display: block;
  padding: 6px 0;
  font-size: 13px;
  font-weight: 800;
  color: var(--graphite);
}

.mobile-group a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding-left: 12px;
  font-size: 15px;
}

/* ============================================================
   site footer
   ============================================================ */

.site-footer {
  margin-top: 72px;
  background: var(--ink);
  color: var(--sand);
}

.footer-inner {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px 32px 24px;
}

.footer-brand {
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(232, 226, 214, 0.18);
}

.footer-logo {
  font-size: 20px;
  font-weight: 800;
  color: var(--white);
}

.footer-slogan {
  margin-top: 8px;
  font-size: 14px;
  color: rgba(232, 226, 214, 0.72);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
  padding: 28px 0;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-col-title {
  margin-bottom: 8px;
  font-size: 13px;
  font-weight: 800;
  color: var(--white);
}

.footer-col a {
  display: inline-block;
  padding: 4px 0;
  font-size: 14px;
  color: rgba(232, 226, 214, 0.78);
}

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

.footer-boundary {
  padding: 18px 0;
  font-size: 13px;
  color: rgba(232, 226, 214, 0.62);
  border-top: 1px solid rgba(232, 226, 214, 0.18);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(232, 226, 214, 0.18);
}

.footer-copy {
  font-size: 13px;
  color: rgba(232, 226, 214, 0.62);
}

.back-to-top {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(232, 226, 214, 0.4);
  border-radius: 50%;
  transition: border-color 160ms ease, transform 160ms ease;
}

.back-to-top:hover {
  border-color: var(--signal);
  transform: translateY(-2px);
}

.back-icon {
  position: relative;
  display: block;
  width: 10px;
  height: 10px;
  border-top: 2px solid var(--sand);
  border-left: 2px solid var(--sand);
  transform: translateY(2px) rotate(45deg);
}

/* ============================================================
   pages · index
   ============================================================ */

.hero {
  padding: 72px 0 64px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 62fr) minmax(0, 38fr);
  gap: 56px;
  align-items: start;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 32px;
}

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

.hero-eyebrow {
  margin-bottom: 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--signal);
}

.hero-copy h1 {
  font-size: 40px;
  font-weight: 800;
  line-height: 1.25;
}

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

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

.hero-index {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 36px;
}

.index-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.index-item a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 44px;
  padding: 14px 16px;
}

.index-num {
  font-size: 12px;
  font-weight: 800;
  color: var(--signal);
}

.index-name {
  font-size: 15px;
  font-weight: 600;
}

.index-desc {
  font-size: 13px;
  color: var(--graphite);
}

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

.hero-media img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.scope,
.catalog,
.standard,
.tabs,
.method,
.faq-preview {
  padding: 64px 0;
}

.scope > .section-head,
.catalog > .section-head,
.standard > .section-head,
.tabs > .section-head,
.method > .section-head,
.faq-preview > .section-head,
.scope > .scope-grid,
.catalog > .catalog-list,
.catalog > .section-media,
.catalog > .catalog-more,
.standard > .standard-grid,
.standard > .standard-more,
.tabs > .tabs-widget,
.tabs > .tabs-more,
.method > .step-bar,
.method > .method-more,
.faq-preview > .faq-list,
.faq-preview > .faq-more {
  width: 100%;
  max-width: var(--shell);
  margin-left: auto;
  margin-right: auto;
  padding-left: 32px;
  padding-right: 32px;
}

.scope-grid {
  display: grid;
  grid-template-columns: minmax(0, 58fr) minmax(0, 42fr);
  gap: 40px;
  align-items: start;
}

.scope-col {
  min-width: 0;
  padding: 26px 26px 28px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.scope-in {
  border-left: 4px solid var(--signal);
}

.scope-out {
  background: var(--sand);
  border-right: 4px solid var(--graphite);
}

.scope-col-title {
  font-size: 18px;
}

.scope-list {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.scope-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  color: var(--graphite);
}

.scope-list li::before {
  content: "";
  position: absolute;
  top: 12px;
  left: 0;
  width: 7px;
  height: 7px;
  background: var(--signal);
  border-radius: 50%;
}

.scope-out .scope-list li::before {
  background: var(--graphite);
}

.section-media {
  margin-bottom: 32px;
}

.section-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.catalog-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.catalog-row {
  display: grid;
  grid-template-columns: 56px minmax(0, 1.1fr) minmax(0, 1.4fr) 128px minmax(0, 1fr);
  gap: 20px;
  align-items: baseline;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.row-stage {
  font-size: 13px;
  font-weight: 800;
  color: var(--signal);
}

.row-name {
  font-size: 16px;
  font-weight: 800;
}

.row-goal {
  font-size: 15px;
  color: var(--graphite);
}

.row-cycle {
  font-size: 13px;
  color: var(--graphite);
}

.row-cond {
  font-size: 13px;
  color: var(--graphite);
}

.catalog-more,
.standard-more,
.tabs-more,
.method-more,
.faq-more {
  margin-top: 28px;
}

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

.standard-card {
  min-width: 0;
  padding: 24px 22px 26px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.standard-name {
  font-size: 18px;
  color: var(--signal);
}

.standard-def {
  margin-top: 12px;
  font-size: 15px;
  color: var(--graphite);
}

.standard-req {
  margin-top: 12px;
  padding-top: 12px;
  font-size: 13px;
  color: var(--graphite);
  border-top: 1px solid var(--line);
}

.tabs-widget {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  overflow: hidden;
}

.tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--line);
  background: var(--sand);
}

.tab {
  min-height: 44px;
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--graphite);
  border-right: 1px solid var(--line);
  border-bottom: 2px solid transparent;
}

.tab:hover {
  color: var(--signal);
}

.tab[aria-selected="true"] {
  color: var(--ink);
  background: var(--white);
  border-bottom-color: var(--signal);
}

.tab-panel {
  padding: 28px 26px;
}

.panel-heading {
  font-size: 18px;
}

.panel-text {
  max-width: var(--narrow);
  margin-top: 12px;
  font-size: 15px;
  color: var(--graphite);
}

.panel-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.panel-list li {
  position: relative;
  padding: 14px 16px 14px 34px;
  font-size: 15px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.panel-list li::before {
  content: "";
  position: absolute;
  top: 22px;
  left: 16px;
  width: 8px;
  height: 2px;
  background: var(--signal);
}

.step-bar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.step {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding: 22px 20px 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 3px solid var(--signal);
  border-radius: var(--radius);
}

.step-num {
  font-size: 13px;
  font-weight: 800;
  color: var(--signal);
}

.step-name {
  font-size: 17px;
  font-weight: 800;
}

.step-action {
  font-size: 15px;
  color: var(--graphite);
}

.step-output {
  font-size: 13px;
  color: var(--graphite);
}

.faq-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

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

.faq-q {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 16px 0;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

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

.faq-q::before {
  content: "+";
  display: inline-block;
  width: 22px;
  font-size: 18px;
  font-weight: 800;
  color: var(--signal);
}

.faq-item[open] .faq-q::before {
  content: "–";
}

.faq-a {
  max-width: var(--narrow);
  padding: 0 0 18px 22px;
  font-size: 15px;
  color: var(--graphite);
}

/* ============================================================
   pages · story
   ============================================================ */

.origin,
.principles,
.boundaries,
.dividing,
.entry {
  padding: 48px 0;
}

.origin .layout-shell,
.principles .layout-shell,
.boundaries .layout-shell,
.dividing .layout-shell,
.entry .layout-shell {
  display: grid;
  grid-template-columns: minmax(0, 62fr) minmax(0, 38fr);
  gap: 48px;
  align-items: start;
}

.origin-body,
.principle-list,
.boundary-list,
.dividing-grid,
.entry-grid {
  min-width: 0;
}

.origin-body p {
  margin-top: 16px;
  font-size: 16px;
  color: var(--graphite);
}

.origin-body .section-title {
  margin-bottom: 8px;
}

.origin-quote {
  margin: 24px 0 0;
  padding: 18px 22px;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  background: var(--sand);
  border-left: 4px solid var(--signal);
  border-radius: var(--radius);
}

.origin-figure img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.principles .layout-shell,
.boundaries .layout-shell,
.dividing .layout-shell,
.entry .layout-shell {
  grid-template-columns: minmax(0, 1fr);
}

.principles .section-title,
.boundaries .section-title,
.dividing .section-title,
.entry .section-title {
  margin-bottom: 12px;
}

.principle-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 24px;
}

.principle-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 20px;
  padding: 20px 22px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.principle-num {
  font-size: 15px;
  font-weight: 800;
  color: var(--signal);
}

.principle-body {
  min-width: 0;
}

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

.principle-body p {
  margin-top: 8px;
  font-size: 15px;
  color: var(--graphite);
}

.boundary-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 24px;
}

.boundary-item {
  min-width: 0;
  padding: 20px 22px;
  background: var(--sand);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

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

.boundary-item p {
  margin-top: 8px;
  font-size: 15px;
  color: var(--graphite);
}

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

.dividing-col {
  min-width: 0;
  padding: 24px 24px 26px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.dividing-yes {
  border-left: 4px solid var(--signal);
}

.dividing-no {
  background: var(--sand);
  border-right: 4px solid var(--graphite);
}

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

.dividing-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
}

.dividing-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  color: var(--graphite);
}

.dividing-list li::before {
  content: "";
  position: absolute;
  top: 12px;
  left: 0;
  width: 7px;
  height: 7px;
  background: var(--signal);
  border-radius: 50%;
}

.dividing-no .dividing-list li::before {
  background: var(--graphite);
}

.entry .entry-grid {
  margin-top: 24px;
}

/* ============================================================
   pages · services
   ============================================================ */

.stage-block {
  padding-bottom: 44px;
  margin-bottom: 44px;
  border-bottom: 1px solid var(--line);
}

.stage-block:last-of-type {
  border-bottom: 0;
}

.stage-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 12px;
}

.stage-num {
  font-size: 13px;
  font-weight: 800;
  color: var(--signal);
}

.stage-head h2 {
  font-size: 28px;
}

.stage-intro {
  max-width: var(--narrow);
  margin-bottom: 24px;
  font-size: 15px;
  color: var(--graphite);
}

.stage-figure {
  margin-bottom: 24px;
}

.stage-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.service-item {
  min-width: 0;
  padding: 22px 24px 24px;
  margin-bottom: 18px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.service-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

.service-head h3 {
  font-size: 18px;
}

.service-cycle {
  flex: 0 0 auto;
  font-size: 13px;
  font-weight: 600;
  color: var(--signal);
}

.service-goal {
  margin-top: 10px;
  font-size: 15px;
  color: var(--graphite);
}

.service-meta {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 6px 16px;
  margin: 16px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.service-meta dt {
  font-size: 13px;
  font-weight: 800;
  color: var(--graphite);
}

.service-meta dd {
  margin: 0;
  font-size: 14px;
  color: var(--ink);
}

.delivery-block {
  padding: 32px 0 8px;
}

.delivery-block h2 {
  font-size: 28px;
  margin-bottom: 24px;
}

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

.delivery-col {
  min-width: 0;
  padding: 22px 24px 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.delivery-col.is-included {
  border-left: 4px solid var(--signal);
}

.delivery-col.is-excluded {
  background: var(--sand);
  border-right: 4px solid var(--graphite);
}

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

.delivery-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
}

.delivery-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  color: var(--graphite);
}

.delivery-list li::before {
  content: "";
  position: absolute;
  top: 12px;
  left: 0;
  width: 7px;
  height: 7px;
  background: var(--signal);
  border-radius: 50%;
}

.delivery-col.is-excluded .delivery-list li::before {
  background: var(--graphite);
}

.standard-aside h2 {
  font-size: 18px;
  margin-bottom: 16px;
}

.standard-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.standard-item {
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.standard-item:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.standard-name {
  font-size: 15px;
  font-weight: 800;
  color: var(--signal);
}

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

.standard-aside .standard-more {
  margin-top: 18px;
}

.related-entry {
  padding: 56px 0 0;
}

.related-entry > h2,
.related-entry > .entry-grid {
  width: 100%;
  max-width: var(--shell);
  margin-left: auto;
  margin-right: auto;
  padding-left: 32px;
  padding-right: 32px;
}

.related-entry > h2 {
  font-size: 28px;
  margin-bottom: 24px;
}

/* ============================================================
   pages · method
   ============================================================ */

.method-steps,
.source-grade,
.cross-check,
.conclusion {
  padding: 48px 0;
}

.method-steps > .section-head,
.method-steps > .method-figure,
.method-steps > .step-list,
.source-grade > .section-head,
.source-grade > .grade-table,
.cross-check > .section-head,
.cross-check > .cross-columns,
.conclusion > .section-head,
.conclusion > .conclusion-figure,
.conclusion > .level-list {
  width: 100%;
  max-width: var(--shell);
  margin-left: auto;
  margin-right: auto;
  padding-left: 32px;
  padding-right: 32px;
}

.method-figure {
  margin-bottom: 32px;
}

.method-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.step-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.step-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding: 22px 20px 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 3px solid var(--signal);
  border-radius: var(--radius);
}

.step-item .step-num {
  font-size: 13px;
  font-weight: 800;
  color: var(--signal);
}

.step-item .step-name {
  font-size: 17px;
}

.step-item .step-action {
  font-size: 15px;
  color: var(--graphite);
}

.step-item .step-output {
  font-size: 13px;
  color: var(--graphite);
}

.step-item .label {
  font-weight: 800;
  color: var(--ink);
}

.grade-table {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.grade-table thead th {
  padding: 14px 18px;
  font-size: 13px;
  font-weight: 800;
  color: var(--ink);
  background: var(--sand);
  border-bottom: 1px solid var(--line);
}

.grade-table tbody th,
.grade-table tbody td {
  padding: 16px 18px;
  font-size: 14px;
  border-bottom: 1px solid var(--line);
}

.grade-table tbody tr:last-child th,
.grade-table tbody tr:last-child td {
  border-bottom: 0;
}

.grade-table tbody th {
  font-weight: 800;
  color: var(--ink);
}

.grade-table tbody td {
  color: var(--graphite);
}

.grade-table tbody tr:nth-child(even) {
  background: var(--paper);
}

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

.cross-col {
  min-width: 0;
  padding: 24px 24px 26px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

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

.cross-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
}

.cross-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  color: var(--graphite);
}

.cross-list li::before {
  content: "";
  position: absolute;
  top: 12px;
  left: 0;
  width: 7px;
  height: 7px;
  background: var(--signal);
  border-radius: 50%;
}

.conclusion-figure {
  margin-bottom: 32px;
}

.conclusion-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.level-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.level-item {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 20px;
  align-items: start;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.level-name {
  font-size: 17px;
  color: var(--signal);
}

.level-cond,
.level-template {
  font-size: 15px;
  color: var(--graphite);
}

.level-cond .label,
.level-template .label {
  display: block;
  margin-bottom: 4px;
  font-size: 13px;
  font-weight: 800;
  color: var(--ink);
}

/* ============================================================
   pages · scenarios
   ============================================================ */

.filters,
.scene-list,
.diff,
.unsuitable,
.entry {
  padding: 48px 0;
}

.filters > h2,
.filters > .section-note,
.filters > .tab-list,
.scene-list > h2,
.scene-list > .scene-figure,
.scene-list > .tab-panels,
.diff > h2,
.diff > .section-note,
.diff > .diff-table,
.unsuitable > h2,
.unsuitable > .section-note,
.unsuitable > .unsuitable-list,
.entry > h2,
.entry > .entry-grid {
  width: 100%;
  max-width: var(--shell);
  margin-left: auto;
  margin-right: auto;
  padding-left: 32px;
  padding-right: 32px;
}

.filters > h2,
.scene-list > h2,
.diff > h2,
.unsuitable > h2,
.entry > h2 {
  font-size: 28px;
  margin-bottom: 12px;
}

.filters > .section-note,
.diff > .section-note,
.unsuitable > .section-note {
  margin-bottom: 24px;
}

.tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tab-list .tab,
.tab-list .tab-btn {
  min-height: 44px;
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--graphite);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

.tab-list .tab:hover,
.tab-list .tab-btn:hover {
  color: var(--signal);
  border-color: var(--signal);
}

.tab-list .tab[aria-selected="true"],
.tab-list .tab-btn.is-active {
  color: var(--white);
  background: var(--signal);
  border-color: var(--signal);
}

.scene-figure {
  margin-bottom: 28px;
}

.scene-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.tab-panels {
  max-width: 860px;
}

.scene-item {
  min-width: 0;
  padding: 24px 26px 26px;
  margin-bottom: 18px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.scene-group {
  display: inline-block;
  margin-bottom: 10px;
  padding: 2px 10px;
  font-size: 13px;
  font-weight: 600;
  color: var(--signal);
  border: 1px solid rgba(184, 67, 26, 0.4);
  border-radius: var(--radius);
}

.scene-item h3 {
  font-size: 18px;
}

.scene-goal {
  margin-top: 10px;
  font-size: 15px;
  color: var(--graphite);
}

.scene-checks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.scene-checks li {
  position: relative;
  padding: 12px 14px 12px 32px;
  font-size: 14px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.scene-checks li::before {
  content: "";
  position: absolute;
  top: 20px;
  left: 14px;
  width: 8px;
  height: 2px;
  background: var(--signal);
}

.scene-pre {
  margin-top: 16px;
  padding-top: 14px;
  font-size: 14px;
  color: var(--graphite);
  border-top: 1px solid var(--line);
}

.diff-table {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.diff-table caption {
  padding: 12px 18px;
  font-size: 13px;
  color: var(--graphite);
  text-align: left;
  background: var(--sand);
  border-bottom: 1px solid var(--line);
}

.diff-table thead th {
  padding: 14px 18px;
  font-size: 13px;
  font-weight: 800;
  color: var(--ink);
  background: var(--sand);
  border-bottom: 1px solid var(--line);
}

.diff-table tbody th,
.diff-table tbody td {
  padding: 16px 18px;
  font-size: 14px;
  border-bottom: 1px solid var(--line);
}

.diff-table tbody tr:last-child th,
.diff-table tbody tr:last-child td {
  border-bottom: 0;
}

.diff-table tbody th {
  font-weight: 800;
  color: var(--ink);
}

.diff-table tbody td {
  color: var(--graphite);
}

.diff-table tbody tr:nth-child(even) {
  background: var(--paper);
}

.unsuitable-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.unsuitable-list li {
  min-width: 0;
  padding: 20px 22px;
  background: var(--sand);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.unsuitable-list h3 {
  font-size: 17px;
}

.unsuitable-list p {
  margin-top: 8px;
  font-size: 15px;
  color: var(--graphite);
}

/* ============================================================
   pages · faq
   ============================================================ */

.faq-group {
  padding: 40px 0;
}

.faq-group > h2,
.faq-group > .faq-group-note,
.faq-group > .faq-figure,
.faq-group > .faq-item {
  width: 100%;
  max-width: var(--narrow);
  margin-left: auto;
  margin-right: auto;
  padding-left: 32px;
  padding-right: 32px;
}

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

.faq-group-note {
  margin-bottom: 20px;
  font-size: 15px;
  color: var(--graphite);
}

.faq-figure {
  margin-bottom: 24px;
}

.faq-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

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

.faq-group .faq-item:first-of-type {
  border-top: 1px solid var(--line);
}

.faq-group summary {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 16px 0;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

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

.faq-group summary::before {
  content: "+";
  flex: 0 0 auto;
  width: 22px;
  font-size: 18px;
  font-weight: 800;
  color: var(--signal);
}

.faq-group details[open] summary::before {
  content: "–";
}

.faq-answer {
  padding: 0 0 18px 22px;
}

.faq-answer p {
  margin-bottom: 10px;
  font-size: 15px;
  color: var(--graphite);
}

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

.entry-links {
  padding: 40px 0 0;
}

.entry-links > h2,
.entry-links > .entry-list {
  width: 100%;
  max-width: var(--narrow);
  margin-left: auto;
  margin-right: auto;
  padding-left: 32px;
  padding-right: 32px;
}

.entry-links > h2 {
  font-size: 24px;
  margin-bottom: 20px;
}

.entry-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.entry-list li {
  padding: 18px 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.entry-list a {
  font-size: 16px;
  font-weight: 800;
  color: var(--signal);
}

.entry-list a:hover {
  color: #9d3815;
}

.entry-list p {
  margin-top: 6px;
  font-size: 14px;
  color: var(--graphite);
}

/* ============================================================
   pages · glossary
   ============================================================ */

.term-tabs,
.term-panels,
.standard-map,
.confusable {
  padding: 40px 0;
}

.section-inner {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 32px;
}

.term-tabs .section-title,
.term-panels .section-title {
  font-size: 24px;
  margin-bottom: 12px;
}

.term-tabs .section-intro {
  margin-bottom: 24px;
}

.term-figure {
  margin-bottom: 28px;
}

.term-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.term-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.term-card {
  min-width: 0;
  padding: 22px 24px 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.term-card h3 {
  font-size: 18px;
}

.term-define {
  margin-top: 10px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.term-detail {
  margin-top: 10px;
  font-size: 15px;
  color: var(--graphite);
}

.term-example {
  margin-top: 12px;
  padding: 12px 14px;
  font-size: 14px;
  color: var(--graphite);
  background: var(--paper);
  border-left: 3px solid var(--signal);
  border-radius: var(--radius);
}

.term-related {
  margin-top: 12px;
  padding-top: 12px;
  font-size: 13px;
  color: var(--graphite);
  border-top: 1px solid var(--line);
}

.standard-map h2,
.confusable h2 {
  font-size: 24px;
  margin-bottom: 20px;
}

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

.compare-col {
  min-width: 0;
  padding: 22px 24px 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.compare-col-yes {
  border-left: 4px solid var(--signal);
}

.compare-col-no {
  background: var(--sand);
  border-right: 4px solid var(--graphite);
}

.compare-col h3 {
  font-size: 17px;
  margin-bottom: 14px;
}

.compare-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.compare-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  color: var(--graphite);
}

.compare-list li::before {
  content: "";
  position: absolute;
  top: 12px;
  left: 0;
  width: 7px;
  height: 7px;
  background: var(--signal);
  border-radius: 50%;
}

.compare-col-no .compare-list li::before {
  background: var(--graphite);
}

.confuse-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.confuse-item {
  min-width: 0;
  padding: 22px 24px 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

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

.confuse-text {
  margin-top: 10px;
  font-size: 15px;
  color: var(--graphite);
}

.entry-item {
  padding: 18px 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

/* ============================================================
   pages · 404
   ============================================================ */

.error-main {
  display: block;
}

.error-block {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 96px 32px 48px;
}

.error-code {
  font-size: 13px;
  font-weight: 800;
  color: var(--signal);
}

.error-block h1 {
  max-width: 720px;
  margin-top: 12px;
  font-size: 40px;
  font-weight: 800;
}

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

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

.error-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.error-links a {
  font-size: 15px;
  font-weight: 600;
  color: var(--signal);
}

.error-links a:hover {
  color: #9d3815;
}

/* ============================================================
   responsive
   ============================================================ */

@media (max-width: 1024px) {
  .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 40px;
  }

  .standard-aside {
    position: static;
  }

  .catalog-row {
    grid-template-columns: 48px minmax(0, 1fr) minmax(0, 1.4fr) 112px;
  }

  .row-cond {
    grid-column: 2 / -1;
  }

  .level-item {
    grid-template-columns: 140px minmax(0, 1fr);
  }

  .level-template {
    grid-column: 2 / -1;
  }
}

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
  }

  .hero-media img {
    height: 280px;
  }

  .scope-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

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

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

  .origin .layout-shell {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

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

@media (max-width: 768px) {
  .primary-nav {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .header-inner {
    min-height: 72px;
    padding: 0 20px;
    gap: 16px;
  }

  .header-actions .btn-outline {
    display: none;
  }

  .breadcrumb,
  .page-header,
  .page-hero {
    padding-left: 20px;
    padding-right: 20px;
  }

  .breadcrumb {
    padding-top: 20px;
  }

  .page-header {
    padding-top: 32px;
  }

  .page-title {
    font-size: 28px;
  }

  .layout-shell,
  .hero-inner {
    padding-left: 20px;
    padding-right: 20px;
  }

  .scope > .section-head,
  .catalog > .section-head,
  .standard > .section-head,
  .tabs > .section-head,
  .method > .section-head,
  .faq-preview > .section-head,
  .scope > .scope-grid,
  .catalog > .catalog-list,
  .catalog > .section-media,
  .catalog > .catalog-more,
  .standard > .standard-grid,
  .standard > .standard-more,
  .tabs > .tabs-widget,
  .tabs > .tabs-more,
  .method > .step-bar,
  .method > .method-more,
  .faq-preview > .faq-list,
  .faq-preview > .faq-more,
  .related-entry > h2,
  .related-entry > .entry-grid,
  .method-steps > .section-head,
  .method-steps > .method-figure,
  .method-steps > .step-list,
  .source-grade > .section-head,
  .source-grade > .grade-table,
  .cross-check > .section-head,
  .cross-check > .cross-columns,
  .conclusion > .section-head,
  .conclusion > .conclusion-figure,
  .conclusion > .level-list,
  .filters > h2,
  .filters > .section-note,
  .filters > .tab-list,
  .scene-list > h2,
  .scene-list > .scene-figure,
  .scene-list > .tab-panels,
  .diff > h2,
  .diff > .section-note,
  .diff > .diff-table,
  .unsuitable > h2,
  .unsuitable > .section-note,
  .unsuitable > .unsuitable-list,
  .entry > h2,
  .entry > .entry-grid,
  .faq-group > h2,
  .faq-group > .faq-group-note,
  .faq-group > .faq-figure,
  .faq-group > .faq-item,
  .entry-links > h2,
  .entry-links > .entry-list,
  .section-inner {
    padding-left: 20px;
    padding-right: 20px;
  }

  .footer-inner {
    padding: 40px 20px 20px;
  }

  .error-block {
    padding: 64px 20px 40px;
  }

  .error-block h1 {
    font-size: 30px;
  }

  .hero {
    padding: 40px 0 40px;
  }

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

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

  .scope,
  .catalog,
  .standard,
  .tabs,
  .method,
  .faq-preview,
  .origin,
  .principles,
  .boundaries,
  .dividing,
  .entry,
  .method-steps,
  .source-grade,
  .cross-check,
  .conclusion,
  .filters,
  .scene-list,
  .diff,
  .unsuitable,
  .faq-group,
  .term-tabs,
  .term-panels,
  .standard-map,
  .confusable {
    padding: 40px 0;
  }

  .section-title,
  .stage-head h2,
  .delivery-block h2,
  .related-entry > h2,
  .filters > h2,
  .scene-list > h2,
  .diff > h2,
  .unsuitable > h2,
  .entry > h2 {
    font-size: 22px;
  }

  .catalog-row {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 10px 14px;
  }

  .row-goal,
  .row-cycle,
  .row-cond {
    grid-column: 2 / -1;
  }

  .standard-grid,
  .step-bar,
  .step-list,
  .cross-columns,
  .delivery-cols,
  .dividing-grid,
  .boundary-list,
  .unsuitable-list,
  .compare-columns,
  .term-grid,
  .confuse-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .level-template {
    grid-column: auto;
  }

  .footer-nav {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }

  .footer-bottom {
    flex-direction: row;
    align-items: center;
  }

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

  .service-meta {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .service-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}

@media (max-width: 480px) {
  .header-inner {
    padding: 0 16px;
  }

  .breadcrumb,
  .page-header,
  .page-hero,
  .layout-shell,
  .hero-inner,
  .section-inner,
  .scope > .section-head,
  .catalog > .section-head,
  .standard > .section-head,
  .tabs > .section-head,
  .method > .section-head,
  .faq-preview > .section-head,
  .scope > .scope-grid,
  .catalog > .catalog-list,
  .catalog > .section-media,
  .catalog > .catalog-more,
  .standard > .standard-grid,
  .standard > .standard-more,
  .tabs > .tabs-widget,
  .tabs > .tabs-more,
  .method > .step-bar,
  .method > .method-more,
  .faq-preview > .faq-list,
  .faq-preview > .faq-more,
  .related-entry > h2,
  .related-entry > .entry-grid,
  .method-steps > .section-head,
  .method-steps > .method-figure,
  .method-steps > .step-list,
  .source-grade > .section-head,
  .source-grade > .grade-table,
  .cross-check > .section-head,
  .cross-check > .cross-columns,
  .conclusion > .section-head,
  .conclusion > .conclusion-figure,
  .conclusion > .level-list,
  .filters > h2,
  .filters > .section-note,
  .filters > .tab-list,
  .scene-list > h2,
  .scene-list > .scene-figure,
  .scene-list > .tab-panels,
  .diff > h2,
  .diff > .section-note,
  .diff > .diff-table,
  .unsuitable > h2,
  .unsuitable > .section-note,
  .unsuitable > .unsuitable-list,
  .entry > h2,
  .entry > .entry-grid,
  .faq-group > h2,
  .faq-group > .faq-group-note,
  .faq-group > .faq-figure,
  .faq-group > .faq-item,
  .entry-links > h2,
  .entry-links > .entry-list {
    padding-left: 16px;
    padding-right: 16px;
  }

  .footer-inner {
    padding: 32px 16px 16px;
  }

  .error-block {
    padding: 48px 16px 32px;
  }

  .page-title,
  .hero-copy h1 {
    font-size: 26px;
  }

  .section-title,
  .stage-head h2,
  .delivery-block h2,
  .related-entry > h2,
  .filters > h2,
  .scene-list > h2,
  .diff > h2,
  .unsuitable > h2,
  .entry > h2,
  .faq-group > h2,
  .entry-links > h2,
  .term-tabs .section-title,
  .term-panels .section-title,
  .standard-map h2,
  .confusable h2 {
    font-size: 20px;
  }

  .hero-media img {
    height: 220px;
  }

  .section-media img,
  .scene-figure img,
  .method-figure img,
  .conclusion-figure img,
  .stage-figure img,
  .faq-figure img,
  .term-figure img {
    height: 200px;
  }

  .principle-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }

  .tab-list .tab,
  .tab-list .tab-btn {
    flex: 1 1 100%;
    justify-content: center;
    text-align: center;
  }

  .grade-table thead th,
  .grade-table tbody th,
  .grade-table tbody td,
  .diff-table thead th,
  .diff-table tbody th,
  .diff-table tbody td {
    padding: 12px 12px;
    font-size: 13px;
  }
}

/* ============================================================
   motion
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* 程序验收反馈：修复网格孤项 */
@media (min-width: 769px) {
  .entry-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}