/* ==========================================================================
   被窝草民午夜影院 · 整站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base：变量、重置、基础排版
   -------------------------------------------------------------------------- */
:root {
  --ink: #1A1A1A;
  --copper: #B5642A;
  --paper: #FAF7F2;
  --muted: #6B6560;
  --line: #E4DDD3;
  --line-strong: #CFC6B8;
  --shell-max: 1120px;
  --read-max: 720px;
  --gap-lg: 56px;
  --gap-md: 32px;
  --gap-sm: 16px;
  --radius: 8px;
  --serif: "Source Han Serif SC", "Songti SC", "SimSun", "Noto Serif SC", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.8;
  text-rendering: optimizeLegibility;
}

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

p {
  margin: 0;
}

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

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

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

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

figure {
  margin: 0;
}

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

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

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: 10px 16px;
  background: var(--ink);
  color: var(--paper);
  z-index: 60;
}

.skip-link:focus {
  left: 12px;
  top: 12px;
}

/* --------------------------------------------------------------------------
   layout：页头、导航、主容器、页脚骨架
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--paper);
  border-bottom: 1px solid var(--line-strong);
}

.header-inner {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
  flex: 0 0 auto;
}

.brand-mark {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0;
}

.brand-sub {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.site-nav {
  flex: 1 1 auto;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  display: inline-block;
  padding: 6px 0;
  font-size: 15px;
  color: var(--ink);
  border-bottom: 2px solid transparent;
}

.nav-link:hover {
  color: var(--copper);
  border-bottom-color: var(--copper);
}

.nav-link.is-current {
  color: var(--copper);
  border-bottom-color: var(--copper);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 0 0 auto;
}

.tool-link {
  font-size: 14px;
  color: var(--muted);
}

.tool-link:hover {
  color: var(--copper);
}

.tool-cta {
  display: inline-block;
  padding: 8px 16px;
  font-size: 14px;
  color: var(--paper);
  background: var(--ink);
  border-radius: var(--radius);
}

.tool-cta:hover {
  background: var(--copper);
  color: var(--paper);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  min-height: 44px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-size: 14px;
}

.nav-toggle-icon {
  display: inline-block;
  width: 16px;
  height: 2px;
  background: var(--ink);
  position: relative;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: var(--ink);
}

.nav-toggle-icon::before {
  top: -5px;
}

.nav-toggle-icon::after {
  top: 5px;
}

.site-main {
  display: block;
}

.inner-main {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 24px 72px;
}

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

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

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

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

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

.page-header {
  padding: 28px 0 40px;
  border-bottom: 3px solid var(--ink);
  margin-bottom: var(--gap-lg);
}

.page-header-inner {
  max-width: var(--read-max);
}

.page-kicker {
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--copper);
  margin-bottom: 12px;
}

.page-title {
  font-size: 40px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 16px;
}

.page-description,
.page-lead {
  max-width: var(--read-max);
  font-size: 16px;
  color: var(--muted);
}

.site-footer {
  background: var(--ink);
  color: #D9D3CB;
  margin-top: 64px;
}

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

.footer-top {
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(250, 247, 242, 0.16);
}

.footer-brand {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  color: #FAF7F2;
  margin-bottom: 8px;
}

.footer-slogan {
  font-size: 15px;
  color: var(--copper);
  margin-bottom: 12px;
}

.footer-desc {
  max-width: var(--read-max);
  font-size: 14px;
  color: #B8B1A8;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--gap-md);
  padding: 32px 0;
  border-bottom: 1px solid rgba(250, 247, 242, 0.16);
}

.footer-col-title {
  font-size: 15px;
  font-weight: 700;
  color: #FAF7F2;
  margin-bottom: 12px;
}

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

.footer-col a {
  font-size: 14px;
  color: #B8B1A8;
}

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

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  padding-top: 24px;
  font-size: 13px;
  color: #9C958C;
}

.footer-boundary {
  flex: 1 1 320px;
}

.footer-copy {
  flex: 0 0 auto;
}

.back-top {
  flex: 0 0 auto;
  padding: 8px 14px;
  border: 1px solid rgba(250, 247, 242, 0.28);
  border-radius: var(--radius);
  color: #FAF7F2;
  font-size: 13px;
}

.back-top:hover {
  color: var(--ink);
  background: var(--copper);
  border-color: var(--copper);
}

/* --------------------------------------------------------------------------
   components：通用区块、标题、链接、图片、表格、问答、相关入口
   -------------------------------------------------------------------------- */
.section {
  padding: var(--gap-lg) 0;
  border-top: 1px solid var(--line);
}

.section:first-of-type {
  border-top: 0;
}

.section-head {
  margin-bottom: var(--gap-md);
}

.section-kicker {
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--copper);
  margin-bottom: 8px;
}

.section-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 12px;
}

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

.section-more,
.section-foot {
  margin-top: var(--gap-md);
  font-size: 15px;
}

.more-link,
.section-foot a {
  display: inline-block;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--copper);
  color: var(--copper);
}

.more-link:hover,
.section-foot a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.inline-link {
  color: var(--copper);
  border-bottom: 1px solid var(--line-strong);
}

.inline-link:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.section-figure,
.section-media,
.faq-media,
.scenario-media,
.stage-media {
  margin-top: var(--gap-md);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #F2EDE5;
}

.section-figure img,
.section-media img,
.faq-media img,
.scenario-media img,
.stage-media img {
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.section-caption,
.media-caption,
.faq-media-caption,
.scenario-media figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--muted);
  background: var(--paper);
  border-top: 1px solid var(--line);
}

.field-table-wrap,
.output-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.field-table,
.output-table {
  min-width: 560px;
  font-size: 15px;
}

.field-table caption,
.output-table caption {
  padding: 14px 16px;
  text-align: left;
  font-size: 14px;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.field-table th,
.field-table td,
.output-table th,
.output-table td {
  padding: 12px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.field-table thead th,
.output-table thead th {
  font-family: var(--serif);
  font-size: 15px;
  color: var(--ink);
  background: #F2EDE5;
}

.field-table tbody th,
.output-table tbody th {
  width: 180px;
  font-weight: 700;
  color: var(--ink);
  background: #F7F3EC;
}

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

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

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

.pitfall-title {
  font-size: 19px;
  margin-bottom: 8px;
}

.pitfall-text {
  max-width: var(--read-max);
  font-size: 15px;
  color: var(--muted);
}

.related-nav,
.section-related {
  padding: var(--gap-lg) 0;
  border-top: 3px solid var(--ink);
}

.related-nav-inner {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 24px;
}

.related-nav-title,
.related-title {
  font-size: 22px;
  margin-bottom: 20px;
}

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

.related-nav-item a,
.related-item a,
.related-links a {
  display: block;
  padding: 16px 18px;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #FDFBF8;
  font-size: 15px;
}

.related-nav-item a:hover,
.related-item a:hover,
.related-links a:hover {
  border-color: var(--copper);
  color: var(--copper);
}

.related-note {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   pages：首页
   -------------------------------------------------------------------------- */
.hero-section {
  border-bottom: 3px solid var(--ink);
}

.hero-inner {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 56px 24px 40px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--gap-lg);
  align-items: start;
}

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

.hero-eyebrow {
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--copper);
  margin-bottom: 14px;
}

.hero-title {
  font-size: 40px;
  font-weight: 700;
  margin-bottom: 18px;
}

.hero-lead {
  font-size: 17px;
  color: var(--ink);
  margin-bottom: 14px;
}

.hero-note {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 28px;
}

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

.entry-card {
  display: block;
  padding: 16px 16px 18px;
  min-height: 44px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: #FDFBF8;
}

.entry-card:hover {
  border-color: var(--copper);
}

.entry-index {
  display: block;
  font-family: var(--serif);
  font-size: 13px;
  color: var(--copper);
  margin-bottom: 6px;
}

.entry-name {
  display: block;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}

.entry-desc {
  display: block;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.7;
}

.hero-figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #F2EDE5;
}

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

.hero-caption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--muted);
  background: var(--paper);
  border-top: 1px solid var(--line);
}

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

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: var(--gap-md);
}

.service-col {
  padding-top: 18px;
  border-top: 3px solid var(--ink);
}

.service-name {
  font-size: 19px;
  margin-bottom: 10px;
}

.service-for {
  font-size: 14px;
  color: var(--copper);
  margin-bottom: 10px;
}

.service-desc {
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 14px;
}

.service-link {
  display: inline-block;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--copper);
  color: var(--copper);
  font-size: 14px;
}

.service-link:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

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

.scenario-item {
  display: grid;
  grid-template-columns: minmax(180px, 240px) minmax(0, 1fr);
  gap: var(--gap-md);
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.scenario-name {
  font-size: 19px;
}

.scenario-bg {
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 8px;
}

.scenario-match {
  font-size: 14px;
  color: var(--ink);
}

.process-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--gap-md);
}

.process-item {
  padding-top: 16px;
  border-top: 1px solid var(--line-strong);
}

.process-num {
  display: block;
  font-family: var(--serif);
  font-size: 28px;
  color: var(--copper);
  margin-bottom: 8px;
}

.process-name {
  font-size: 19px;
  margin-bottom: 8px;
}

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

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

.scope-col {
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #FDFBF8;
}

.scope-included {
  border-top: 4px solid var(--copper);
}

.scope-excluded {
  border-top: 4px solid var(--line-strong);
}

.scope-heading {
  font-size: 19px;
  margin-bottom: 14px;
}

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

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

.scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 2px;
  background: var(--copper);
}

.scope-excluded .scope-list li::before {
  background: var(--line-strong);
}

.prepare-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 340px);
  gap: var(--gap-lg);
  align-items: start;
}

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

.prepare-item {
  padding-left: 18px;
  border-left: 3px solid var(--copper);
}

.prepare-name {
  font-size: 19px;
  margin-bottom: 8px;
}

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

.prepare-aside {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #F2EDE5;
}

.aside-title {
  font-size: 19px;
  margin-bottom: 12px;
}

.aside-text {
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 16px;
}

.aside-links {
  display: grid;
  gap: 10px;
  margin-bottom: 16px;
}

.aside-note {
  font-size: 13px;
  color: var(--muted);
  padding-top: 14px;
  border-top: 1px solid var(--line-strong);
}

/* --------------------------------------------------------------------------
   pages：服务类别页
   -------------------------------------------------------------------------- */
.category-block {
  padding: var(--gap-md) 0;
  border-top: 1px solid var(--line);
}

.category-block:first-of-type {
  border-top: 3px solid var(--ink);
}

.category-block-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 320px);
  gap: var(--gap-md);
  align-items: baseline;
  margin-bottom: 16px;
}

.category-name {
  font-size: 22px;
}

.category-audience {
  font-size: 14px;
  color: var(--copper);
}

.category-intro {
  max-width: var(--read-max);
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 14px;
}

.category-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 10px 24px;
}

.category-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
}

.category-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 2px;
  background: var(--copper);
}

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

.deliverable-item {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #FDFBF8;
}

.deliverable-name {
  font-size: 19px;
  margin-bottom: 12px;
}

.deliverable-meta {
  margin: 0;
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 6px 12px;
  font-size: 14px;
}

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

.deliverable-meta dd {
  margin: 0;
  color: var(--ink);
}

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

.exclusion-item {
  padding: 20px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--line-strong);
  border-radius: var(--radius);
}

.exclusion-name {
  font-size: 19px;
  margin-bottom: 12px;
}

.exclusion-points {
  display: grid;
  gap: 8px;
}

.exclusion-points li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  color: var(--muted);
}

.exclusion-points li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--line-strong);
}

/* --------------------------------------------------------------------------
   pages：行业场景页
   -------------------------------------------------------------------------- */
.section-inner {
  max-width: var(--shell-max);
  margin: 0 auto;
}

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

.scenario-index-item {
  display: grid;
  grid-template-columns: minmax(200px, 280px) minmax(0, 1fr);
  gap: var(--gap-md);
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.scenario-index-name {
  font-size: 19px;
}

.scenario-index-name a {
  border-bottom: 1px solid transparent;
}

.scenario-index-name a:hover {
  border-bottom-color: var(--copper);
}

.scenario-index-basis {
  font-size: 15px;
  color: var(--muted);
}

.scenario-block {
  padding: var(--gap-md) 0;
  border-top: 1px solid var(--line);
}

.scenario-block-title {
  font-size: 22px;
  margin-bottom: 16px;
}

.scenario-block .scenario-media {
  margin-top: 0;
  margin-bottom: 16px;
}

.scenario-block .scenario-media img {
  aspect-ratio: 21 / 9;
}

.scenario-block-text {
  max-width: var(--read-max);
  font-size: 16px;
  color: var(--ink);
}

.scenario-map-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--gap-md);
}

.scenario-map-item {
  padding: 20px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--copper);
  border-radius: var(--radius);
  background: #FDFBF8;
}

.scenario-map-name {
  font-size: 19px;
  margin-bottom: 10px;
}

.scenario-map-service {
  font-size: 14px;
  color: var(--copper);
  margin-bottom: 8px;
}

.scenario-map-note {
  font-size: 15px;
  color: var(--muted);
}

.scenario-map-foot {
  margin-top: var(--gap-md);
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 15px;
}

.scenario-map-foot a {
  padding-bottom: 2px;
  border-bottom: 1px solid var(--copper);
  color: var(--copper);
}

.scenario-map-foot a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.scenario-next {
  margin-top: var(--gap-md);
  padding: 20px 24px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--copper);
  border-radius: var(--radius);
  background: #F2EDE5;
}

.scenario-next-text {
  max-width: var(--read-max);
  font-size: 15px;
  color: var(--ink);
}

.scenario-next-text a {
  color: var(--copper);
  border-bottom: 1px solid var(--line-strong);
}

.scenario-next-text a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* --------------------------------------------------------------------------
   pages：交付流程页
   -------------------------------------------------------------------------- */
.stage-index {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: var(--gap-md);
  border-top: 1px solid var(--line);
  padding-top: var(--gap-md);
}

.stage-index-item {
  display: grid;
  gap: 6px;
  padding-left: 16px;
  border-left: 3px solid var(--copper);
}

.stage-index-num {
  font-family: var(--serif);
  font-size: 24px;
  color: var(--copper);
}

.stage-index-name {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 700;
}

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

.stage-block {
  display: grid;
  grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
  gap: var(--gap-md);
  padding: var(--gap-md) 0;
  border-top: 1px solid var(--line);
}

.stage-block:first-of-type {
  border-top: 3px solid var(--ink);
}

.stage-block .stage-media {
  margin-top: 0;
}

.stage-block .stage-media img {
  aspect-ratio: 4 / 3;
}

.stage-title {
  font-size: 22px;
  margin-bottom: 16px;
}

.stage-num {
  display: inline-block;
  margin-right: 10px;
  font-size: 15px;
  color: var(--copper);
}

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

.stage-side-title {
  font-size: 16px;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.stage-list {
  display: grid;
  gap: 8px;
}

.stage-list li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  color: var(--muted);
}

.stage-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 2px;
  background: var(--line-strong);
}

/* --------------------------------------------------------------------------
   pages：常见问题页
   -------------------------------------------------------------------------- */
.faq-group {
  padding: var(--gap-lg) 0;
  border-top: 1px solid var(--line);
}

.faq-group-head {
  margin-bottom: var(--gap-md);
}

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

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

.faq-question {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 18px 0;
  min-height: 44px;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.faq-question::before {
  content: "+";
  flex: 0 0 auto;
  width: 22px;
  font-family: var(--sans);
  font-size: 20px;
  line-height: 1.5;
  color: var(--copper);
  text-align: center;
}

.faq-item[open] .faq-question::before {
  content: "−";
}

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

.faq-answer {
  padding: 0 0 20px 34px;
}

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

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

.faq-answer a {
  color: var(--copper);
  border-bottom: 1px solid var(--line-strong);
}

.faq-answer a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

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

.feedback-item {
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--copper);
  border-radius: var(--radius);
  background: #FDFBF8;
}

.feedback-title {
  font-size: 19px;
  margin-bottom: 10px;
}

.feedback-text {
  font-size: 15px;
  color: var(--muted);
}

.feedback-text a {
  color: var(--copper);
  border-bottom: 1px solid var(--line-strong);
}

.feedback-text a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* --------------------------------------------------------------------------
   pages：错误页
   -------------------------------------------------------------------------- */
.error-main {
  min-height: 52vh;
}

.error-inner {
  max-width: var(--read-max);
  margin: 0 auto;
  padding: 80px 24px 48px;
}

.error-code {
  font-family: var(--serif);
  font-size: 56px;
  font-weight: 700;
  color: var(--copper);
  line-height: 1;
  margin-bottom: 16px;
}

.error-inner h1 {
  font-size: 32px;
  margin-bottom: 16px;
}

.error-desc {
  font-size: 16px;
  color: var(--muted);
  margin-bottom: 28px;
}

.error-actions {
  margin-bottom: 40px;
}

.error-home {
  display: inline-block;
  padding: 12px 22px;
  min-height: 44px;
  color: var(--paper);
  background: var(--ink);
  border-radius: var(--radius);
}

.error-home:hover {
  background: var(--copper);
  color: var(--paper);
}

.error-links ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--gap-sm);
}

.error-links a {
  display: block;
  padding: 14px 16px;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #FDFBF8;
  font-size: 15px;
}

.error-links a:hover {
  border-color: var(--copper);
  color: var(--copper);
}

/* --------------------------------------------------------------------------
   responsive：1024 / 768 / 480
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--gap-md);
    padding-top: 40px;
  }

  .hero-figure {
    order: -1;
  }

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

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

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

  .category-block-head {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

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

@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
    padding: 12px 20px;
  }

  .nav-toggle {
    display: inline-flex;
    order: 3;
    margin-left: auto;
  }

  .site-nav {
    order: 4;
    flex-basis: 100%;
  }

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

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

  .nav-list li {
    border-bottom: 1px solid var(--line);
  }

  .nav-link {
    display: block;
    padding: 14px 4px;
    min-height: 44px;
    border-bottom: 0;
  }

  .nav-link.is-current {
    border-bottom: 0;
  }

  .header-tools {
    order: 2;
    margin-left: auto;
  }

  .tool-link {
    display: none;
  }

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

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

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

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

  .hero-inner,
  .home-main .section {
    padding-left: 20px;
    padding-right: 20px;
  }

  .inner-main {
    padding-left: 20px;
    padding-right: 20px;
  }

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

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

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

  .section {
    padding: 40px 0;
  }

  .page-header {
    padding: 20px 0 28px;
    margin-bottom: 40px;
  }

  .related-nav,
  .section-related {
    padding: 40px 0;
  }

  .related-nav-inner {
    padding: 0 20px;
  }

  .footer-inner {
    padding: 40px 20px 28px;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

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

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

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

  .hero-lead {
    font-size: 16px;
  }

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

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

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .deliverable-meta {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .deliverable-meta dd {
    margin-bottom: 8px;
  }

  .faq-question {
    font-size: 17px;
  }

  .faq-answer {
    padding-left: 0;
  }

  .error-code {
    font-size: 44px;
  }

  .error-inner 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;
  }
}