/* ==========================================================================
   囧次元 · 全站样式表
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base
   -------------------------------------------------------------------------- */

:root {
  --ink: #23262b;
  --ink-soft: #5b6169;
  --ink-faint: #8a9099;
  --accent: #2f6f6a;
  --accent-deep: #255753;
  --line: #e6e8ea;
  --line-strong: #d3d6d9;
  --bg: #ffffff;
  --bg-soft: #f7f8f8;
  --bg-tint: #f2f5f4;
  --radius: 6px;
  --shell: 1120px;
  --reading: 760px;
  --gap: 32px;
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

p {
  margin: 0;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

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

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

button {
  font: inherit;
  color: inherit;
}

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

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

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
}

.topbar {
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
}

.topbar-text {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 9px 24px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 24px;
  max-width: var(--shell);
  width: 100%;
  margin: 0 auto;
  padding: 18px 24px;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}

.brand {
  flex: 0 0 auto;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink);
}

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

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

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

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

.nav-list > li > a:hover,
.nav-list > li > a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--line-strong);
}

.nav-list > li > a.is-current {
  color: var(--accent);
  font-weight: 600;
  border-bottom-color: var(--accent);
}

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 44px;
  height: 44px;
  padding: 0;
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  cursor: pointer;
  position: relative;
}

.nav-toggle::before,
.nav-toggle::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  height: 2px;
  background: var(--ink);
}

.nav-toggle::before {
  top: 16px;
  box-shadow: 0 6px 0 var(--ink);
}

.nav-toggle::after {
  bottom: 16px;
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px 72px;
}

.inner-main {
  padding-top: 28px;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
  color: var(--ink-soft);
}

.footer-intro,
.footer-groups,
.footer-copy {
  max-width: var(--shell);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.footer-intro {
  padding-top: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}

.footer-brand {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.04em;
}

.footer-about {
  margin-top: 8px;
  max-width: 640px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.footer-groups {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px var(--gap);
  padding-top: 32px;
  padding-bottom: 32px;
}

.footer-group-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.03em;
}

.footer-list {
  margin-top: 12px;
}

.footer-list > li + li {
  margin-top: 8px;
}

.footer-list a {
  display: inline-block;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.footer-list a:hover,
.footer-list a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-copy {
  padding-top: 18px;
  padding-bottom: 28px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink-faint);
}

/* --------------------------------------------------------------------------
   components
   -------------------------------------------------------------------------- */

/* 区块通用头 */
.section-head {
  margin-bottom: 24px;
}

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

.section-lead,
.section-lede,
.section-intro {
  margin-top: 10px;
  max-width: var(--reading);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.section-foot {
  margin-top: 24px;
}

.text-link {
  display: inline-block;
  font-size: 15px;
  color: var(--accent);
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
}

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

/* 图片容器 */
.content-media,
.media-figure,
.guide-figure,
.page-figure,
.page-media,
.section-figure {
  margin: 0;
}

.content-media img,
.media-figure img,
.guide-figure img,
.page-figure img,
.page-media img,
.section-figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-tint);
}

.content-media figcaption,
.media-figure figcaption,
.guide-figure figcaption,
.page-figure figcaption,
.page-media figcaption,
.section-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-faint);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 4px 0 0;
  font-size: 13px;
  color: var(--ink-faint);
}

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

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

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

/* 页面标题区 */
.page-header {
  padding: 20px 0 28px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}

.page-title {
  font-size: 34px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--ink);
}

.page-description {
  margin-top: 14px;
  max-width: var(--reading);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* 相关服务指引 */
.related-links,
.related-section {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.related-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 20px;
}

.related-item a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 12px 16px;
  font-size: 15px;
  color: var(--ink);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.related-item a:hover,
.related-item a:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--bg-tint);
}

/* 折叠问答 */
.faq-list {
  margin-top: 20px;
  border-top: 1px solid var(--line);
}

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

.faq-item summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  min-height: 48px;
  padding: 16px 40px 16px 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  position: relative;
}

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

.faq-item summary::after {
  content: "";
  position: absolute;
  right: 12px;
  top: 24px;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--ink-soft);
  border-bottom: 2px solid var(--ink-soft);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}

.faq-item[open] summary {
  color: var(--accent);
}

.faq-item[open] summary::after {
  transform: rotate(-135deg);
  border-color: var(--accent);
}

.faq-item > p,
.faq-answer {
  padding: 0 40px 20px 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.faq-answer > p + p {
  margin-top: 10px;
}

/* --------------------------------------------------------------------------
   pages
   -------------------------------------------------------------------------- */

/* ---------- 首页 ---------- */

.home-main {
  padding-top: 36px;
}

/* 首屏 */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
  gap: 48px;
  align-items: start;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--line);
}

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

.hero-kicker {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.hero-title {
  margin-top: 12px;
  font-size: 40px;
  line-height: 1.25;
  color: var(--ink);
}

.hero-lead {
  margin-top: 16px;
  max-width: 560px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  font-size: 15px;
  border-radius: var(--radius);
  border: 1px solid transparent;
}

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

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

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

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

.hero-side {
  min-width: 0;
  padding: 24px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.hero-side-title {
  font-size: 16px;
  color: var(--ink);
}

.hero-dimensions {
  margin: 16px 0 0;
}

.hero-dimension {
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

.hero-dimension dt {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}

.hero-dimension dd {
  margin: 4px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.hero-side-note {
  margin-top: 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.hero .content-media {
  grid-column: 1 / -1;
}

.content-media-primary img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

/* 服务方向索引 */
.service-index {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

.direction-rows {
  border-top: 1px solid var(--line);
}

.direction-row {
  display: grid;
  grid-template-columns: 64px minmax(160px, 220px) minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 8px 24px;
  align-items: baseline;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.row-no {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

.row-name {
  font-size: 17px;
  color: var(--ink);
}

.row-fit,
.row-detail {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
  min-width: 0;
}

/* 合作流程预览 */
.process-preview {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

.process-preview .media-figure {
  margin-bottom: 32px;
}

.process-preview .media-figure img {
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

.stage-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.stage-strip .stage-item {
  min-width: 0;
  padding: 22px 20px 24px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.stage-no {
  display: block;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.stage-strip .stage-name {
  margin-top: 8px;
  font-size: 17px;
  color: var(--ink);
}

.stage-ours,
.stage-yours {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* 交付范围摘要 */
.scope-summary {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

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

.scope-col {
  min-width: 0;
  padding: 24px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

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

.scope-list {
  margin-top: 16px;
}

.scope-list > li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.scope-list > li + li {
  margin-top: 10px;
}

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

.scope-summary .media-figure {
  margin-top: 32px;
}

.scope-summary .media-figure img {
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

/* 常见问题速览 */
.faq-preview {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

/* 站内栏目索引 */
.site-index {
  padding: 56px 0 8px;
}

.index-columns {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 24px;
  border-top: 1px solid var(--line);
  padding-top: 28px;
}

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

.index-name {
  font-size: 16px;
}

.index-name a {
  color: var(--ink);
}

.index-name a:hover,
.index-name a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.index-desc {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 服务方向页 ---------- */

.direction-list {
  margin-bottom: 56px;
}

.direction-list .section-intro {
  margin-bottom: 24px;
}

.direction-list .direction-row {
  display: block;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.direction-list .direction-row:last-child {
  border-bottom: 1px solid var(--line);
}

.direction-no {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

.direction-name {
  margin-top: 6px;
  font-size: 19px;
  color: var(--ink);
}

.direction-fields {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 10px 24px;
  margin: 16px 0 0;
  max-width: var(--reading);
}

.direction-fields dt {
  font-size: 14px;
  color: var(--ink-faint);
}

.direction-fields dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.reading-guide {
  padding-top: 40px;
  border-top: 1px solid var(--line);
}

.reading-guide .section-intro {
  margin-bottom: 24px;
}

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

.guide-figure img {
  width: 100%;
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

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

.guide-group {
  min-width: 0;
  padding: 22px 22px 24px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.guide-group-title {
  font-size: 16px;
  color: var(--ink);
}

.guide-group p {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 合作流程页 ---------- */

.page-figure {
  margin-bottom: 56px;
}

.page-figure img {
  width: 100%;
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

.stage-section {
  margin-bottom: 56px;
}

.stage-section .section-lede {
  margin-bottom: 28px;
}

.stage-list {
  border-top: 1px solid var(--line);
}

.stage-list .stage-item {
  display: grid;
  grid-template-columns: minmax(200px, 260px) minmax(0, 1fr);
  gap: 16px 40px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.stage-head {
  min-width: 0;
}

.stage-num {
  display: block;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.stage-list .stage-name {
  margin-top: 8px;
  font-size: 19px;
  color: var(--ink);
}

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

.stage-line {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.stage-line + .stage-line {
  margin-top: 10px;
}

.stage-label {
  display: inline-block;
  min-width: 76px;
  margin-right: 8px;
  font-size: 14px;
  color: var(--ink-faint);
}

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

.transition-section .section-lede {
  margin-bottom: 28px;
}

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

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

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

.transition-text {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.transition-note {
  margin-top: 24px;
  max-width: var(--reading);
  padding-left: 16px;
  border-left: 3px solid var(--accent);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 交付范围页 ---------- */

.section {
  margin-bottom: 56px;
}

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

.delivery-list {
  border-top: 1px solid var(--line);
}

.delivery-row {
  display: grid;
  grid-template-columns: 64px minmax(160px, 240px) minmax(0, 1fr) minmax(0, 1fr);
  gap: 8px 24px;
  align-items: baseline;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.delivery-no {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

.delivery-name {
  font-size: 17px;
  color: var(--ink);
}

.delivery-field {
  min-width: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.field-label {
  display: block;
  margin-bottom: 2px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
}

.delivery-list-section .section-figure {
  margin-top: 32px;
}

.section-figure img {
  width: 100%;
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

.scope-exclude-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px var(--gap);
}

.scope-exclude-item {
  min-width: 0;
  padding: 20px 22px 22px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

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

.exclude-text {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

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

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

.acceptance-col-items {
  background: var(--bg-soft);
}

.acceptance-col-methods {
  background: var(--bg);
}

.acceptance-col-title {
  font-size: 16px;
  color: var(--ink);
}

.acceptance-item-list,
.acceptance-method-list {
  margin-top: 16px;
}

.acceptance-item,
.acceptance-method {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.acceptance-item + .acceptance-item,
.acceptance-method + .acceptance-method {
  margin-top: 10px;
}

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

.acceptance-section .section-figure {
  margin-top: 32px;
}

/* ---------- 问题解答页 ---------- */

.page-media {
  margin-bottom: 48px;
}

.page-media img {
  width: 100%;
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

.faq-group {
  margin-bottom: 48px;
}

.faq-group .section-intro {
  margin-bottom: 20px;
}

.faq-group .faq-item summary {
  font-size: 16px;
}

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

.error-main {
  padding-top: 64px;
}

.error-hero {
  padding-bottom: 48px;
  border-bottom: 1px solid var(--line);
}

.error-code {
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--accent);
}

.error-hero h1 {
  margin-top: 12px;
  font-size: 34px;
  line-height: 1.3;
}

.error-lead {
  margin-top: 14px;
  max-width: var(--reading);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.error-home-link {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  margin-top: 24px;
  padding: 0 22px;
  font-size: 15px;
  color: #ffffff;
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
}

.error-home-link:hover,
.error-home-link:focus-visible {
  color: #ffffff;
  background: var(--accent-deep);
  border-color: var(--accent-deep);
}

.error-paths {
  padding-top: 48px;
}

.error-paths h2 {
  font-size: 22px;
}

.error-path-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px var(--gap);
  margin-top: 24px;
}

.error-path-list > li {
  min-width: 0;
  padding: 20px 22px 22px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.error-path-list a {
  display: inline-block;
  min-height: 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.error-path-list a:hover,
.error-path-list a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.error-path-list p {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

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

@media (max-width: 960px) {
  .site-header {
    flex-wrap: wrap;
    gap: 12px;
    padding: 14px 20px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    flex: 1 0 100%;
    justify-content: flex-start;
    border-top: 1px solid var(--line);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    padding: 8px 0 4px;
  }

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

  .nav-list > li > a {
    min-height: 44px;
    padding: 0 4px;
    border-bottom: 1px solid var(--line);
  }

  .nav-list > li > a.is-current {
    border-bottom-color: var(--accent);
  }

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

  .topbar-text,
  .footer-intro,
  .footer-groups,
  .footer-copy {
    padding-left: 20px;
    padding-right: 20px;
  }

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

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

  .hero-title {
    font-size: 32px;
  }

  .direction-row,
  .delivery-row {
    grid-template-columns: 48px minmax(0, 1fr);
  }

  .row-fit,
  .row-detail,
  .delivery-field {
    grid-column: 2 / -1;
  }

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

  .scope-columns,
  .guide-groups,
  .transition-grid,
  .acceptance-columns,
  .scope-exclude-list,
  .error-path-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .stage-list .stage-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

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

@media (max-width: 640px) {
  body {
    font-size: 16px;
  }

  .topbar-text {
    font-size: 12px;
    line-height: 1.6;
  }

  .site-header {
    padding: 12px 16px;
  }

  .brand {
    font-size: 18px;
  }

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

  .topbar-text,
  .footer-intro,
  .footer-groups,
  .footer-copy {
    padding-left: 16px;
    padding-right: 16px;
  }

  .inner-main {
    padding-top: 20px;
  }

  .page-header {
    padding: 16px 0 22px;
    margin-bottom: 32px;
  }

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

  .page-description {
    font-size: 15px;
  }

  .hero-title {
    font-size: 27px;
  }

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

  .hero-actions {
    gap: 10px;
  }

  .btn {
    flex: 1 1 100%;
    min-height: 48px;
  }

  .hero-side {
    padding: 20px;
  }

  .section-title {
    font-size: 20px;
  }

  .service-index,
  .process-preview,
  .scope-summary,
  .faq-preview,
  .site-index {
    padding: 40px 0;
  }

  .direction-row,
  .delivery-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .row-fit,
  .row-detail,
  .delivery-field {
    grid-column: 1 / -1;
  }

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

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

  .direction-fields dd {
    margin-bottom: 8px;
  }

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

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

  .stage-label {
    display: block;
    min-width: 0;
    margin-right: 0;
    margin-bottom: 2px;
  }

  .faq-item summary {
    padding-right: 34px;
  }

  .faq-item > p,
  .faq-answer {
    padding-right: 0;
  }

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

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

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}