:root {
  --color-primary: #1f3a5f;
  --color-accent: #2f7d6e;
  --color-mark: #c97b3a;
  --color-bg: #f7f8f6;
  --color-panel: #ffffff;
  --color-text: #2b2f33;
  --color-muted: #5c646b;
  --color-line: #d8dcd6;
  --color-line-soft: #e7eae4;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --container: 1120px;
  --gap-sm: 12px;
  --gap-md: 20px;
  --gap-lg: 32px;
  --shadow-card: 0 1px 2px rgba(31, 58, 95, 0.06), 0 6px 18px rgba(31, 58, 95, 0.05);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, "Courier New", monospace;
}

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

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

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

.site-body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.7;
  min-width: 320px;
}

.site-body h1,
.site-body h2,
.site-body h3,
.site-body h4 {
  margin: 0;
  color: var(--color-primary);
  font-weight: 600;
  line-height: 1.35;
}

.site-body p {
  margin: 0;
}

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

.site-body dl,
.site-body dd {
  margin: 0;
}

.site-body a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.site-body a:hover,
.site-body a:focus-visible {
  color: var(--color-accent);
}

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

.site-body button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
}

.site-body :focus-visible {
  outline: 2px solid var(--color-mark);
  outline-offset: 2px;
}

.site-body table {
  border-collapse: collapse;
  width: 100%;
}

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

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap-md);
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 24px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  min-height: 44px;
  padding-right: 8px;
  color: var(--color-primary);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.brand-logo:hover,
.brand-logo:focus-visible {
  color: var(--color-accent);
}

.site-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: flex-end;
}

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

.nav-list > li {
  display: block;
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 500;
  white-space: nowrap;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  background-color: #eef2f0;
  color: var(--color-accent);
}

.nav-list a.is-current {
  color: var(--color-accent);
  box-shadow: inset 0 -2px 0 var(--color-accent);
}

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

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 1px;
}

.site-main {
  display: block;
  width: 100%;
}

.home-main {
  max-width: 100%;
}

.inner-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 64px;
}

.section,
.home-main > section {
  padding: 56px 0;
}

.home-main > section {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

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

.section-title {
  font-size: 26px;
  margin-bottom: 10px;
}

.section-desc,
.section-intro {
  color: var(--color-muted);
  font-size: 15px;
}

.section-intro {
  max-width: 760px;
  margin-bottom: 24px;
}

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

.section-more a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--color-accent);
  font-weight: 500;
}

.section-more a::after {
  content: "→";
  margin-left: 6px;
  font-family: var(--font-mono);
}

.section-note {
  margin-top: 24px;
  color: var(--color-muted);
  font-size: 15px;
}

.section-note a {
  color: var(--color-accent);
  font-weight: 500;
}

.section-tail {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  font-size: 15px;
}

.section-tail a {
  color: var(--color-accent);
  font-weight: 500;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  text-align: center;
}

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

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: #ffffff;
}

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

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 0 0;
  font-size: 14px;
  color: var(--color-muted);
}

.breadcrumb a {
  color: var(--color-muted);
  min-height: 24px;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--color-accent);
}

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

.breadcrumb-current {
  color: var(--color-primary);
  font-weight: 500;
}

.page-header {
  padding: 20px 0 32px;
  border-bottom: 1px solid var(--color-line);
  margin-bottom: 40px;
}

.page-title {
  font-size: 32px;
  margin-bottom: 12px;
}

.page-description {
  max-width: 780px;
  color: var(--color-muted);
  font-size: 15px;
}

.page-lead {
  max-width: 780px;
  margin-top: 10px;
  color: var(--color-text);
  font-size: 15px;
}

.subsection-title {
  font-size: 18px;
  margin-bottom: 14px;
}

.table-caption {
  caption-side: top;
  text-align: left;
  padding-bottom: 12px;
  color: var(--color-muted);
  font-size: 14px;
}

.data-table {
  width: 100%;
  font-size: 15px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.data-table th,
.data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-line-soft);
  text-align: left;
  vertical-align: top;
}

.data-table thead th {
  background-color: #eef2f0;
  color: var(--color-primary);
  font-weight: 600;
}

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

.data-table tbody tr:hover {
  background-color: #f4f7f5;
}

.section-figure,
.media-figure,
.scene-figure {
  margin: 0;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.section-figure img,
.media-figure img,
.scene-figure img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  background-color: #e7eae4;
}

.section-figure-caption,
.scene-caption,
.media-figure figcaption {
  padding: 12px 16px;
  color: var(--color-muted);
  font-size: 14px;
  border-top: 1px solid var(--color-line-soft);
}

.faq-item {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  margin-bottom: 10px;
}

.faq-item summary,
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 44px;
  padding: 12px 16px;
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

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

.faq-item summary::after,
.faq-question::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--color-accent);
}

.faq-item[open] summary::after,
.faq-item[open] .faq-question::after {
  content: "−";
}

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

.faq-answer {
  padding: 0 16px 16px;
  color: var(--color-text);
  font-size: 15px;
}

.faq-answer p {
  margin: 0;
}

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

.faq-group-title {
  font-size: 17px;
  margin-bottom: 12px;
  padding-left: 12px;
  border-left: 3px solid var(--color-accent);
}

.return-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--gap-sm);
}

.return-item a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 44px;
  padding: 14px 16px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  font-weight: 500;
}

.return-item a:hover,
.return-item a:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.return-name {
  font-size: 15px;
}

.return-note {
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 400;
}

.related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 16px;
  margin-top: 40px;
  padding: 18px 20px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  font-size: 14px;
}

.related-links-label {
  color: var(--color-muted);
}

.related-links-item {
  color: var(--color-accent);
  font-weight: 500;
}

.related-links-item:hover,
.related-links-item:focus-visible {
  color: var(--color-primary);
}

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

.site-footer {
  background-color: var(--color-primary);
  color: #d9e0e6;
  margin-top: 24px;
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(240px, 1.4fr) repeat(4, minmax(140px, 1fr));
  gap: var(--gap-lg) var(--gap-md);
  max-width: var(--container);
  margin: 0 auto;
  padding: 48px 24px 32px;
}

.footer-brand {
  max-width: 320px;
}

.footer-logo {
  color: #ffffff;
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}

.footer-slogan {
  color: #a7c3bd;
  font-size: 14px;
  margin-bottom: 10px;
}

.footer-desc {
  color: #b8c3cb;
  font-size: 14px;
}

.footer-col-title {
  color: #ffffff;
  font-size: 15px;
  margin-bottom: 12px;
}

.footer-list li {
  margin-bottom: 4px;
}

.footer-list a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  color: #c4ced6;
  font-size: 14px;
}

.footer-list a:hover,
.footer-list a:focus-visible {
  color: #ffffff;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap-md);
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px 24px 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.footer-copy {
  color: #aab6bf;
  font-size: 13px;
}

.back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 14px;
  background-color: transparent;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: var(--radius-md);
  color: #e6ebef;
  font-size: 14px;
}

.back-to-top:hover,
.back-to-top:focus-visible {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
  color: #ffffff;
}

.back-to-top-icon {
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
}

.back-to-top-icon::before {
  content: "↑";
}

/* ============ pages: home ============ */

.section-hero {
  padding-top: 48px;
}

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

.hero-text {
  max-width: 560px;
}

.hero-eyebrow {
  display: inline-block;
  margin-bottom: 14px;
  padding: 4px 10px;
  background-color: #e8f0ed;
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 500;
}

.hero-title {
  font-size: 36px;
  margin-bottom: 16px;
}

.hero-desc {
  color: var(--color-muted);
  font-size: 16px;
  margin-bottom: 20px;
}

.hero-points {
  display: grid;
  gap: 8px;
  margin-bottom: 24px;
}

.hero-points li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  color: var(--color-text);
}

.hero-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  background-color: var(--color-mark);
  border-radius: 2px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-sm);
}

.hero-visual {
  display: grid;
  gap: var(--gap-md);
}

.hero-figure {
  margin: 0;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.hero-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  background-color: #e7eae4;
}

.hero-figure figcaption {
  padding: 12px 16px;
  color: var(--color-muted);
  font-size: 14px;
  border-top: 1px solid var(--color-line-soft);
}

.hero-entries {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap-sm);
}

.entry-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 44px;
  padding: 14px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-md);
}

.entry-card:hover,
.entry-card:focus-visible {
  border-left-color: var(--color-mark);
  background-color: #f2f6f4;
}

.entry-label {
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 600;
}

.entry-note {
  color: var(--color-muted);
  font-size: 13px;
}

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

.index-row {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) 120px;
  align-items: center;
  gap: var(--gap-md);
  padding: 18px 0;
  border-bottom: 1px solid var(--color-line);
}

.index-num {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--color-mark);
}

.index-name {
  font-size: 17px;
  margin-bottom: 4px;
}

.index-summary {
  color: var(--color-muted);
  font-size: 14px;
}

.index-link {
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  min-height: 44px;
  color: var(--color-accent);
  font-size: 14px;
  font-weight: 500;
}

.index-link::after {
  content: "→";
  margin-left: 6px;
  font-family: var(--font-mono);
}

.index-row:hover .index-name {
  color: var(--color-accent);
}

.timeline {
  position: relative;
  display: grid;
  gap: 20px;
  padding-left: 0;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  margin-left: -1px;
  background-color: var(--color-line);
}

.timeline-item {
  position: relative;
  width: calc(50% - 28px);
}

.timeline-item::before {
  content: "";
  position: absolute;
  top: 20px;
  width: 12px;
  height: 12px;
  background-color: var(--color-panel);
  border: 2px solid var(--color-accent);
  border-radius: 50%;
}

.timeline-left {
  justify-self: start;
}

.timeline-left::before {
  right: -34px;
}

.timeline-right {
  justify-self: end;
}

.timeline-right::before {
  left: -34px;
}

.timeline-card {
  padding: 16px 18px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.timeline-name {
  font-size: 16px;
  margin-bottom: 6px;
}

.timeline-note {
  color: var(--color-muted);
  font-size: 14px;
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--gap-md);
}

.case-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.case-card:hover {
  border-color: var(--color-accent);
}

.case-figure,
.case-media {
  margin: 0;
  overflow: hidden;
  background-color: #e7eae4;
}

.case-figure img,
.case-media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.case-type,
.case-tag {
  padding: 14px 18px 0;
  color: var(--color-mark);
  font-size: 13px;
  font-weight: 500;
}

.case-summary,
.case-desc {
  padding: 8px 18px 0;
  color: var(--color-muted);
  font-size: 14px;
}

.case-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin: 12px 18px 18px;
  color: var(--color-accent);
  font-size: 14px;
  font-weight: 500;
}

.case-link::after {
  content: "→";
  margin-left: 6px;
  font-family: var(--font-mono);
}

.materials-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: var(--gap-lg);
  align-items: start;
}

.materials-table-wrap {
  min-width: 0;
}

.materials-side {
  min-width: 0;
  padding: 20px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.standard-list {
  display: grid;
  gap: 10px;
}

.standard-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  color: var(--color-text);
}

.standard-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

.cooperation-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap-lg);
  align-items: start;
}

.cooperation-col {
  min-width: 0;
  padding: 20px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.prepare-list {
  display: grid;
  gap: 10px;
}

.prepare-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
}

.prepare-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background-color: var(--color-mark);
  border-radius: 2px;
}

.faq-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--gap-md);
}

.faq-groups .faq-group {
  margin-bottom: 0;
}

/* ============ pages: service-scope ============ */

.service-index-list {
  display: grid;
  border-top: 1px solid var(--color-line);
}

.service-index-row {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: var(--gap-md);
  padding: 16px 0;
  border-bottom: 1px solid var(--color-line);
}

.service-index-no {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--color-mark);
}

.service-index-name {
  font-size: 17px;
  margin-bottom: 4px;
}

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

.coverage-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap-lg);
  align-items: start;
}

.coverage-col {
  min-width: 0;
  padding: 20px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.coverage-col-title {
  font-size: 17px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line-soft);
}

.coverage-list {
  display: grid;
  gap: 14px;
}

.coverage-item-name {
  font-size: 15px;
  margin-bottom: 4px;
}

.coverage-item p {
  color: var(--color-muted);
  font-size: 14px;
}

.boundary-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--gap-md);
}

.boundary-item {
  padding: 18px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-mark);
  border-radius: var(--radius-md);
}

.boundary-item-title {
  font-size: 16px;
  margin-bottom: 6px;
}

.boundary-item p {
  color: var(--color-muted);
  font-size: 14px;
}

.section-links .section-figure {
  margin-bottom: 24px;
}

.link-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--gap-md);
}

.link-card {
  display: flex;
  flex-direction: column;
  padding: 20px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.link-card-title {
  font-size: 16px;
  margin-bottom: 8px;
}

.link-card-desc {
  color: var(--color-muted);
  font-size: 14px;
  margin-bottom: 12px;
}

.link-card-action {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: auto;
  color: var(--color-accent);
  font-size: 14px;
  font-weight: 500;
}

.link-card-action::after {
  content: "→";
  margin-left: 6px;
  font-family: var(--font-mono);
}

/* ============ pages: style-cases ============ */

.section-filter {
  position: sticky;
  top: 68px;
  z-index: 20;
  padding: 16px 0;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-line);
}

.section-filter .section-title {
  font-size: 18px;
  margin-bottom: 10px;
}

.filter-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: 999px;
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 500;
}

.filter-link:hover,
.filter-link:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.filter-link.is-active {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: #ffffff;
}

.case-body {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
}

.case-title {
  padding: 6px 18px 0;
  font-size: 17px;
}

.case-meta {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 10px;
  margin: 12px 18px 18px;
  padding-top: 12px;
  border-top: 1px solid var(--color-line-soft);
  font-size: 13px;
}

.case-meta dt {
  color: var(--color-muted);
}

.case-meta dd {
  color: var(--color-text);
}

.source-list {
  display: grid;
  gap: var(--gap-md);
}

.source-item {
  padding: 18px 20px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.source-title {
  font-size: 16px;
  margin-bottom: 6px;
}

.source-item p {
  color: var(--color-muted);
  font-size: 14px;
}

.link-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap-lg);
  align-items: start;
}

.link-col {
  min-width: 0;
  padding: 20px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.link-col-title {
  font-size: 16px;
  margin-bottom: 8px;
}

.link-col-desc {
  color: var(--color-muted);
  font-size: 14px;
  margin-bottom: 12px;
}

.link-entry {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--color-accent);
  font-size: 14px;
  font-weight: 500;
}

.link-entry::after {
  content: "→";
  margin-left: 6px;
  font-family: var(--font-mono);
}

/* ============ pages: delivery-process ============ */

.timeline-list {
  position: relative;
  display: grid;
  gap: var(--gap-md);
  padding-left: 32px;
}

.timeline-list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background-color: var(--color-line);
}

.timeline-list .timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 0.6fr);
  gap: var(--gap-md);
  align-items: start;
  width: auto;
  padding: 18px 20px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.timeline-marker {
  position: absolute;
  left: -32px;
  top: 22px;
  width: 16px;
  height: 16px;
  background-color: var(--color-panel);
  border: 2px solid var(--color-accent);
  border-radius: 50%;
}

.timeline-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--gap-md);
  grid-column: 1 / -1;
}

.timeline-stage {
  font-size: 16px;
  margin-bottom: 6px;
}

.timeline-text {
  color: var(--color-muted);
  font-size: 14px;
}

.timeline-col-output {
  padding-left: var(--gap-md);
  border-left: 1px solid var(--color-line-soft);
}

.timeline-output-label {
  color: var(--color-muted);
  font-size: 13px;
  margin-bottom: 4px;
}

.timeline-output {
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 500;
}

.section-timeline .section-figure {
  margin-top: 28px;
}

.task-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap-lg);
  align-items: start;
}

.task-col {
  min-width: 0;
  padding: 20px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.task-col-title {
  font-size: 17px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line-soft);
}

.task-list,
.output-list {
  display: grid;
  gap: 12px;
}

.task-item,
.output-item {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: var(--gap-sm);
  align-items: baseline;
}

.task-stage,
.output-stage {
  color: var(--color-mark);
  font-size: 14px;
  font-weight: 500;
}

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

.coop-list {
  display: grid;
  gap: var(--gap-md);
}

.coop-item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: var(--gap-md);
  padding: 18px 20px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.coop-index {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--color-mark);
}

.coop-title {
  font-size: 16px;
  margin-bottom: 6px;
}

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

.coop-time {
  margin-top: 8px;
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 500;
}

.check-list {
  display: grid;
  gap: 14px;
}

.section-check .check-list {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--gap-md);
}

.check-item {
  padding: 18px 20px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.check-title {
  font-size: 16px;
  margin-bottom: 6px;
}

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

.link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--gap-sm);
}

.link-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 44px;
  padding: 16px 18px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.link-card:hover,
.link-card:focus-visible {
  border-color: var(--color-accent);
  background-color: #f2f6f4;
}

.link-card-label {
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 600;
}

.link-card-text {
  color: var(--color-muted);
  font-size: 13px;
}

/* ============ pages: materials-standards ============ */

.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-md);
}

.material-table {
  min-width: 640px;
}

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

.columns {
  display: grid;
  gap: var(--gap-lg);
  align-items: start;
}

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

.column {
  min-width: 0;
  padding: 20px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.column-title {
  font-size: 17px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line-soft);
}

.column-standards .check-list li,
.column-check .check-list li {
  position: relative;
  padding-left: 20px;
  color: var(--color-text);
  font-size: 14px;
}

.column-standards .check-list li::before,
.column-check .check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

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

.source-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--gap-md);
}

.links-columns .column-link-card {
  display: flex;
  flex-direction: column;
}

.column-link-card p {
  color: var(--color-muted);
  font-size: 14px;
  margin-bottom: 12px;
}

.link-more {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: auto;
  color: var(--color-accent);
  font-size: 14px;
  font-weight: 500;
}

.link-more::after {
  content: "→";
  margin-left: 6px;
  font-family: var(--font-mono);
}

/* ============ pages: cooperation-guide ============ */

.prep-list {
  display: grid;
  gap: var(--gap-md);
}

.prep-item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: var(--gap-md);
  padding: 18px 20px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.prep-index {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--color-mark);
}

.prep-title {
  font-size: 16px;
  margin-bottom: 6px;
}

.prep-text {
  color: var(--color-muted);
  font-size: 14px;
}

.prep-text a {
  color: var(--color-accent);
  font-weight: 500;
}

.section-scene .scene-figure {
  margin: 0;
}

.communication-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap-lg);
  align-items: start;
}

.communication-col {
  min-width: 0;
  padding: 20px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.col-title {
  font-size: 17px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line-soft);
}

.method-list {
  display: grid;
  gap: 14px;
}

.method-title {
  font-size: 15px;
  margin-bottom: 4px;
}

.method-text {
  color: var(--color-muted);
  font-size: 14px;
}

.path-list {
  display: grid;
  gap: 14px;
}

.path-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: var(--gap-sm);
  align-items: start;
}

.path-step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: #e8f0ed;
  border-radius: 50%;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 14px;
}

.path-text {
  color: var(--color-muted);
  font-size: 14px;
  padding-top: 4px;
}

.section-faq .faq-group {
  margin-bottom: 24px;
}

.section-faq .faq-group:last-child {
  margin-bottom: 0;
}

/* ============ pages: 404 ============ */

.error-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 64px 24px;
}

.error-panel {
  max-width: 640px;
  padding: 32px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.error-code {
  font-family: var(--font-mono);
  font-size: 40px;
  color: var(--color-mark);
  margin-bottom: 8px;
}

.error-title {
  font-size: 26px;
  margin-bottom: 12px;
}

.error-desc {
  color: var(--color-muted);
  font-size: 15px;
  margin-bottom: 24px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-sm);
  margin-bottom: 28px;
}

.error-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--gap-sm);
  padding-top: 20px;
  border-top: 1px solid var(--color-line-soft);
}

.error-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--color-accent);
  font-size: 14px;
  font-weight: 500;
}

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

@media (max-width: 960px) {
  .header-inner {
    flex-wrap: wrap;
    padding: 12px 20px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    flex: 1 0 100%;
    justify-content: flex-start;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    padding: 8px 0 4px;
    border-top: 1px solid var(--color-line);
  }

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

  .nav-list a {
    width: 100%;
    padding: 0 12px;
  }

  .nav-list a.is-current {
    box-shadow: none;
    background-color: #eef2f0;
  }

  .inner-main {
    padding: 0 20px 56px;
  }

  .home-main > section {
    padding-left: 20px;
    padding-right: 20px;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--gap-md);
  }

  .hero-text {
    max-width: none;
  }

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

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

  .materials-layout,
  .cooperation-layout,
  .coverage-columns,
  .link-columns,
  .task-columns,
  .communication-grid,
  .columns-2 {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding: 40px 20px 28px;
  }

  .footer-brand {
    grid-column: 1 / -1;
    max-width: none;
  }

  .section-filter {
    top: 60px;
  }

  .timeline::before {
    left: 7px;
    margin-left: 0;
  }

  .timeline-item {
    width: 100%;
    padding-left: 32px;
  }

  .timeline-left::before,
  .timeline-right::before {
    left: 1px;
    right: auto;
  }
}

@media (max-width: 640px) {
  .site-body {
    font-size: 15px;
  }

  .header-inner {
    padding: 10px 16px;
  }

  .brand-logo {
    font-size: 18px;
  }

  .inner-main {
    padding: 0 16px 48px;
  }

  .home-main > section {
    padding-top: 40px;
    padding-bottom: 40px;
    padding-left: 16px;
    padding-right: 16px;
  }

  .section-head {
    margin-bottom: 22px;
  }

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

  .page-header {
    padding: 16px 0 24px;
    margin-bottom: 28px;
  }

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

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

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

  .hero-figure img {
    height: 190px;
  }

  .index-row {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 12px;
  }

  .index-link {
    grid-column: 2 / 3;
    justify-content: flex-start;
  }

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

  .section-figure img,
  .media-figure img,
  .scene-figure img {
    height: 200px;
  }

  .timeline-list {
    padding-left: 26px;
  }

  .timeline-list::before {
    left: 5px;
  }

  .timeline-marker {
    left: -26px;
    width: 14px;
    height: 14px;
  }

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

  .timeline-col-output {
    padding-left: 0;
    padding-top: 10px;
    border-left: none;
    border-top: 1px solid var(--color-line-soft);
  }

  .task-item,
  .output-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .coop-item,
  .prep-item {
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 12px;
    padding: 16px;
  }

  .error-main {
    padding: 40px 16px;
  }

  .error-panel {
    padding: 24px 20px;
  }

  .error-code {
    font-size: 32px;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 32px 16px 24px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 16px 16px 20px;
  }

  .back-to-top {
    align-self: flex-start;
  }

  .section-filter {
    top: 56px;
  }

  .filter-list {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 4px;
    -webkit-overflow-scrolling: touch;
  }

  .filter-link {
    flex: 0 0 auto;
  }

  .table-wrap {
    margin: 0 -16px;
    padding: 0 16px;
    border-radius: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-body *,
  .site-body *::before,
  .site-body *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}