/* ==========================================================================
   国精产品天美一区 · 站点样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

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

:root {
  --paper: #F5F1E8;
  --surface: #FFFFFF;
  --ink: #1C1A17;
  --ink-soft: #57514A;
  --terracotta: #9C3F2E;
  --teal: #2E4744;
  --line: #D8CFBE;
  --line-strong: #C3B8A2;
  --serif: Georgia, "Songti SC", "Noto Serif SC", serif;
  --sans: system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "SFMono-Regular", "Menlo", "Consolas", monospace;
  --shell: 1120px;
  --gutter: 32px;
  --radius: 6px;
}

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

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

body.site-body {
  margin: 0;
  padding: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink);
  margin: 0;
}

p {
  margin: 0 0 1em;
}

p:last-child {
  margin-bottom: 0;
}

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

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

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--terracotta);
  outline-offset: 3px;
}

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

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

figure {
  margin: 0;
}

dl {
  margin: 0;
}

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

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

/* --------------------------------------------------------------------------
   layout · 全站骨架
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: var(--paper);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 78px;
}

.brand-mark {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink);
  white-space: nowrap;
  padding: 6px 0;
  border-bottom: 2px solid var(--terracotta);
}

.brand-mark:hover {
  color: var(--terracotta);
}

.primary-nav.site-nav {
  margin-left: auto;
}

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

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  font-size: 15px;
  color: var(--ink-soft);
  border-bottom: 2px solid transparent;
}

.nav-link:hover,
.nav-link.is-current {
  color: var(--ink);
  border-bottom-color: var(--teal);
}

.nav-link.is-current {
  font-weight: 600;
}

.has-submenu > .nav-link::after {
  content: "";
  width: 5px;
  height: 5px;
  margin-left: 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-1px);
}

.submenu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 196px;
  padding: 8px 0;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 24px rgba(28, 26, 23, 0.08);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 0.16s ease, transform 0.16s ease, visibility 0.16s;
}

.has-submenu:hover .submenu,
.has-submenu:focus-within .submenu,
.has-submenu.is-open .submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.submenu li a {
  display: block;
  padding: 9px 18px;
  font-size: 14px;
  color: var(--ink-soft);
}

.submenu li a:hover {
  color: var(--terracotta);
  background-color: var(--paper);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  margin-left: auto;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--ink);
}

.header-version {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  white-space: nowrap;
  padding-left: 18px;
  border-left: 1px solid var(--line);
}

.site-main {
  display: block;
}

.inner-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter) 88px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 26px 0 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

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

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

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

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

.page-header {
  padding: 18px 0 0;
}

.page-title {
  font-family: var(--serif);
  font-size: clamp(28px, 3.2vw, 36px);
  font-weight: 600;
  line-height: 1.32;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-lead,
.page-lede {
  margin-top: 14px;
  max-width: 42em;
  font-size: 16px;
  color: var(--ink-soft);
}

.page-meta,
.page-meta-line,
.page-note {
  margin-top: 12px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.page-meta a,
.page-note a {
  color: var(--terracotta);
  border-bottom: 1px solid var(--line-strong);
}

.page-meta a:hover,
.page-note a:hover {
  border-bottom-color: var(--terracotta);
}

/* 展签元信息条 */
.label-meta,
.plate-meta,
.exhibit-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.label-code,
.label-no,
.plate-no,
.exhibit-code {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--teal);
}

.label-cat,
.label-topic,
.plate-topic,
.exhibit-tag {
  padding: 1px 8px;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  font-size: 12px;
  color: var(--teal);
}

.label-ver,
.label-version,
.plate-ver,
.plate-version,
.exhibit-ver {
  font-size: 12px;
  color: var(--ink-soft);
}

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

/* 页面配图 */
.page-figure,
.article-media,
.media-block,
.content-figure {
  margin: 28px 0 0;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-figure img,
.article-media img,
.media-block img,
.content-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.page-figure figcaption,
.media-caption,
.media-block figcaption,
.figure-caption {
  padding: 12px 18px;
  font-size: 13px;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
}

/* --------------------------------------------------------------------------
   components · 通用模块
   -------------------------------------------------------------------------- */

.section {
  padding: 64px 0;
  border-top: 1px solid var(--line);
}

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

.section-head h2,
.section-title,
.content-section h2,
.section-block h2 {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.section-desc {
  margin: 10px 0 0;
  max-width: 42em;
  font-size: 15px;
  color: var(--ink-soft);
}

.section-note {
  margin-top: 20px;
  font-size: 14px;
  color: var(--ink-soft);
}

.section-note a {
  color: var(--terracotta);
  border-bottom: 1px solid var(--line-strong);
}

.section-note a:hover {
  border-bottom-color: var(--terracotta);
}

.link-more,
.entry-link,
.text-link,
.aside-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  font-size: 14px;
  color: var(--terracotta);
  border-bottom: 1px solid transparent;
}

.link-more::after,
.entry-link::after {
  content: "→";
  transition: transform 0.18s ease;
}

.link-more:hover,
.entry-link:hover,
.text-link:hover,
.aside-link:hover {
  color: var(--ink);
  border-bottom-color: var(--line-strong);
}

.link-more:hover::after,
.entry-link:hover::after {
  transform: translateX(4px);
}

.text-link,
.aside-link {
  border-bottom-color: var(--line-strong);
}

/* 步骤序号（首页与内页各自限定作用域） */
.path-hint .step-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.path-hint .step-item {
  padding: 22px 22px 24px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.path-hint .step-num {
  display: block;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--terracotta);
}

.path-hint .step-title {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 600;
}

.path-hint .step-note {
  font-size: 14px;
  color: var(--ink-soft);
}

.path-link,
.version-link,
.entry-link,
.section-tail {
  margin-top: 26px;
}

/* 完成检查清单 */
.check-list {
  display: grid;
  gap: 12px;
}

.check-item {
  position: relative;
  padding-left: 26px;
  font-size: 15px;
  color: var(--ink);
}

.check-mark {
  position: absolute;
  left: 0;
  top: 7px;
  width: 12px;
  height: 12px;
  border: 1.5px solid var(--teal);
  border-radius: 2px;
}

.check-item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 10px;
  width: 6px;
  height: 6px;
  background-color: var(--teal);
}

/* 折叠问答 */
.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: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 56px;
  padding: 14px 0;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  flex: none;
  font-family: var(--sans);
  font-size: 20px;
  font-weight: 400;
  color: var(--terracotta);
}

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

.faq-answer {
  padding: 0 0 20px;
  max-width: 42em;
}

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

/* 相关内容条 */
.related-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 20px;
  padding: 26px 0;
  border-top: 1px solid var(--line);
}

.related-links-label {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.related-links-item {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  color: var(--teal);
  border-bottom: 1px solid var(--line-strong);
}

.related-links-item:hover {
  color: var(--terracotta);
  border-bottom-color: var(--terracotta);
}

/* 双栏布局：主内容在前，侧栏在后 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 740px) minmax(0, 320px);
  gap: 48px;
  align-items: start;
  padding-top: 8px;
}

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

.content-aside {
  min-width: 0;
  display: grid;
  gap: 24px;
  padding-top: 8px;
}

.aside-card,
.aside-block {
  padding: 22px 22px 24px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.aside-title {
  margin-bottom: 14px;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.aside-note {
  margin: 16px 0 8px;
  font-size: 13px;
  color: var(--ink-soft);
}

.aside-link-list,
.aside-list {
  display: grid;
  gap: 4px;
}

.aside-link-list a,
.aside-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  color: var(--teal);
  border-bottom: 1px solid var(--line);
}

.aside-link-list a:hover,
.aside-list a:hover {
  color: var(--terracotta);
}

/* --------------------------------------------------------------------------
   pages · 首页
   -------------------------------------------------------------------------- */

.home-main {
  padding-bottom: 0;
}

.hero-wall {
  position: relative;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 34px var(--gutter) 0;
}

.hero-figure {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--surface);
}

.hero-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.hero-label {
  position: relative;
  margin: -96px 0 0 40px;
  max-width: 560px;
  padding: 26px 30px 30px;
  background-color: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.hero-label h1 {
  font-family: var(--serif);
  font-size: clamp(28px, 3.4vw, 38px);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.hero-lead {
  margin: 14px 0 22px;
  max-width: 34em;
  font-size: 15px;
  color: var(--ink-soft);
}

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

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 24px;
  font-size: 15px;
  border-radius: var(--radius);
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--terracotta);
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: #85331F;
  color: #FFFFFF;
}

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

.btn-secondary:hover {
  border-color: var(--teal);
  color: var(--teal);
}

/* 频道索引条 */
.channel-index-strip {
  max-width: var(--shell);
  margin: 34px auto 0;
  padding: 0 var(--gutter);
}

.strip-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.strip-item {
  border-right: 1px solid var(--line);
}

.strip-item:last-child {
  border-right: 0;
}

.strip-item a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 96px;
  padding: 18px 16px;
  color: var(--ink);
}

.strip-item a:hover {
  background-color: var(--surface);
  color: var(--terracotta);
}

.strip-code {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--terracotta);
}

.strip-name {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
}

.strip-note {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.home-main > .section,
.home-main > .related-links {
  max-width: var(--shell);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.topic-index {
  border-top: 0;
}

/* 题材索引长列表 */
.index-list {
  border-top: 1px solid var(--line);
}

.index-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) 44px;
  align-items: center;
  gap: 20px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.row-code {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--teal);
}

.row-title {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.4;
}

.row-title a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 5px;
  transition: text-decoration-color 0.18s ease, color 0.18s ease;
}

.index-row:hover .row-title a,
.row-title a:focus-visible {
  color: var(--terracotta);
  text-decoration-color: var(--terracotta);
}

.row-desc {
  margin: 6px 0 0;
  max-width: 40em;
  font-size: 14px;
  color: var(--ink-soft);
}

.row-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--ink-soft);
  transition: transform 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.row-arrow::before {
  content: "→";
  font-size: 16px;
}

.row-arrow:hover {
  color: var(--terracotta);
  border-color: var(--terracotta);
  transform: translateX(3px);
}

/* 专题展柜 */
.cabinet-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.cabinet-item {
  display: flex;
  flex-direction: column;
  padding: 16px 16px 20px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.cabinet-figure {
  margin: 0 0 16px;
  border-radius: 4px;
  overflow: hidden;
}

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

.cabinet-title {
  margin: 4px 0 8px;
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
}

.cabinet-angle {
  flex: 1 1 auto;
  font-size: 14px;
  color: var(--ink-soft);
}

.cabinet-item .link-more {
  margin-top: 10px;
  align-self: flex-start;
}

/* 入口核验摘要 */
.entry-summary {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: 44px;
  align-items: start;
}

.entry-figure figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--surface);
}

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

.entry-body h2 {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  line-height: 1.4;
}

.entry-body .check-list {
  margin-top: 20px;
}

.entry-body .entry-link {
  margin-top: 22px;
}

/* 版本摘要 */
.version-list {
  border-top: 1px solid var(--line);
}

.version-row {
  display: grid;
  grid-template-columns: 120px 140px minmax(0, 1fr);
  gap: 20px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.version-no {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--teal);
}

.version-batch {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.version-change {
  color: var(--ink);
}

/* --------------------------------------------------------------------------
   pages · 频道分类
   -------------------------------------------------------------------------- */

.content-section {
  padding: 56px 0 0;
}

.content-section > p {
  max-width: 42em;
  color: var(--ink-soft);
}

.rule-list {
  margin-top: 24px;
  display: grid;
  gap: 10px;
  padding: 18px 20px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.rule-list li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  font-size: 14px;
  color: var(--ink-soft);
}

.rule-no {
  flex: none;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--terracotta);
}

.channel-entry {
  margin-top: 32px;
  padding: 24px 0 4px;
  border-top: 1px solid var(--line);
}

.channel-entry h3 {
  margin: 6px 0 16px;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
}

.channel-detail {
  display: grid;
  gap: 6px 20px;
}

.channel-detail dt {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--teal);
}

.channel-detail dd {
  margin: 0 0 12px;
  max-width: 42em;
  font-size: 15px;
  color: var(--ink-soft);
}

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

.compare-col {
  padding: 20px 22px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.compare-col h3 {
  margin-bottom: 8px;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
}

.compare-col p {
  font-size: 14px;
  color: var(--ink-soft);
}

.compare-table {
  margin-top: 26px;
  font-size: 14px;
  border: 1px solid var(--line);
  background-color: var(--surface);
}

.compare-table caption {
  padding: 10px 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  text-align: left;
}

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

.compare-table thead th {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--teal);
  background-color: var(--paper);
  border-bottom: 1px solid var(--line-strong);
}

.compare-table tbody tr:last-child td {
  border-bottom: 0;
}

.exclude-list {
  margin-top: 20px;
  display: grid;
  gap: 10px;
}

.exclude-list li {
  position: relative;
  padding-left: 22px;
  max-width: 42em;
  font-size: 15px;
  color: var(--ink-soft);
}

.exclude-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 11px;
  width: 8px;
  height: 1.5px;
  background-color: var(--terracotta);
}

/* --------------------------------------------------------------------------
   pages · 专题片单
   -------------------------------------------------------------------------- */

.section-intro {
  border-top: 0;
  padding-top: 40px;
}

.section-intro p,
.section-sort-logic > p,
.section-tradeoff > p {
  max-width: 42em;
  color: var(--ink-soft);
}

.topic-entry {
  display: grid;
  grid-template-columns: minmax(0, 280px) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
  padding: 32px 0;
  border-top: 1px solid var(--line);
}

.topic-figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--surface);
}

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

.topic-figure .exhibit-meta {
  margin: 0;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  gap: 8px;
}

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

.topic-name {
  margin-bottom: 10px;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.4;
}

.topic-angle,
.topic-structure {
  margin-bottom: 10px;
  font-size: 15px;
  color: var(--ink-soft);
}

.topic-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 14px 0 4px;
}

.topic-body .entry-link {
  margin-top: 6px;
}

.sort-item {
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.sort-name {
  margin-bottom: 8px;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
}

.sort-desc {
  max-width: 42em;
  font-size: 15px;
  color: var(--ink-soft);
}

.section-tradeoff {
  padding-bottom: 8px;
}

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

.tradeoff-name {
  margin-bottom: 6px;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
}

.tradeoff-item p {
  max-width: 42em;
  font-size: 15px;
  color: var(--ink-soft);
}

.section-tail {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  padding: 20px 0 0;
}

.section-tail a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  color: var(--terracotta);
  border-bottom: 1px solid var(--line-strong);
}

.section-tail a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* --------------------------------------------------------------------------
   pages · 观看指南
   -------------------------------------------------------------------------- */

.page-viewing-guide .page-title {
  padding-top: 4px;
}

.page-viewing-guide .plate-meta {
  margin-top: 26px;
}

.page-viewing-guide .page-note {
  max-width: 42em;
}

.guide-section {
  padding: 44px 0 0;
}

.guide-section h2 {
  margin-bottom: 14px;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  line-height: 1.4;
}

.guide-section > p {
  max-width: 42em;
  color: var(--ink-soft);
}

.prep-list {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

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

.prep-item h3 {
  margin-bottom: 6px;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
}

.prep-item p {
  font-size: 15px;
  color: var(--ink-soft);
}

.step-list {
  margin-top: 24px;
  border-top: 1px solid var(--line);
}

.step-list .step-item {
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.step-list .step-no {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--terracotta);
}

.step-list .step-item h3 {
  margin-bottom: 10px;
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 600;
}

.step-list .step-item p {
  max-width: 42em;
  font-size: 15px;
  color: var(--ink-soft);
}

.step-list .step-tip {
  margin: 10px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--teal);
  font-size: 14px;
  color: var(--teal);
}

.deviation-list {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.deviation-item {
  padding: 18px 20px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--terracotta);
  border-radius: var(--radius);
}

.deviation-item h3 {
  margin-bottom: 6px;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
}

.deviation-item p {
  font-size: 15px;
  color: var(--ink-soft);
}

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

.material-item h3 {
  margin-bottom: 4px;
  font-size: 15px;
  font-weight: 600;
}

.material-item p {
  font-size: 14px;
  color: var(--ink-soft);
}

.aside-card .check-list {
  gap: 10px;
}

.aside-card .check-item {
  font-size: 14px;
}

/* --------------------------------------------------------------------------
   pages · 入口核验
   -------------------------------------------------------------------------- */

.page-entry-check .plate-meta {
  margin-top: 26px;
}

.criteria-section,
.anomaly-section,
.nextstep-section,
.faq-section {
  padding: 44px 0 0;
}

.criteria-section h2,
.anomaly-section h2,
.nextstep-section h2,
.faq-section h2 {
  margin-bottom: 14px;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  line-height: 1.4;
}

.criteria-section > p,
.anomaly-section > p,
.nextstep-section > p {
  max-width: 42em;
  color: var(--ink-soft);
}

.criteria-section .media-block {
  margin-top: 24px;
}

.criteria-list {
  margin-top: 26px;
  border-top: 1px solid var(--line);
}

.criteria-item {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.criteria-no {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--terracotta);
}

.criteria-name {
  margin-bottom: 8px;
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 600;
}

.criteria-point {
  margin-bottom: 6px;
  font-size: 15px;
  color: var(--ink);
}

.criteria-desc {
  max-width: 42em;
  font-size: 15px;
  color: var(--ink-soft);
}

.anomaly-list {
  display: grid;
  gap: 18px;
  margin-top: 24px;
}

.anomaly-item {
  padding: 20px 22px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.anomaly-name {
  margin-bottom: 10px;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
}

.anomaly-sign,
.anomaly-judge,
.anomaly-next {
  font-size: 14px;
  color: var(--ink-soft);
}

.anomaly-sign {
  color: var(--ink);
}

.anomaly-next {
  margin-bottom: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  color: var(--teal);
}

.nextstep-list {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.nextstep-item {
  padding: 16px 20px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.nextstep-name {
  margin-bottom: 6px;
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
}

.nextstep-desc {
  font-size: 14px;
  color: var(--ink-soft);
}

.faq-section .faq-list {
  margin-top: 20px;
}

.aside-checklist .checklist {
  display: grid;
  gap: 10px;
}

.checklist-item {
  position: relative;
  padding-left: 24px;
  font-size: 14px;
  color: var(--ink-soft);
}

.checklist-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 11px;
  height: 11px;
  border: 1.5px solid var(--teal);
  border-radius: 2px;
}

.aside-checklist .aside-link {
  margin-top: 16px;
}

/* --------------------------------------------------------------------------
   pages · 更新记录
   -------------------------------------------------------------------------- */

.page-updates .page-title {
  padding-top: 4px;
}

.page-updates .page-figure {
  margin-top: 28px;
}

.page-content {
  padding-top: 8px;
}

.section-block {
  padding: 48px 0 0;
}

.section-block > p {
  max-width: 42em;
  color: var(--ink-soft);
}

.rule-examples {
  margin-top: 22px;
  display: grid;
  gap: 10px;
  padding: 18px 20px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.rule-example {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  align-items: baseline;
  font-size: 14px;
  color: var(--ink-soft);
}

.rule-code {
  flex: none;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--teal);
}

.change-list {
  margin-top: 22px;
  border-top: 1px solid var(--line);
}

.change-row {
  display: grid;
  grid-template-columns: 110px 120px minmax(0, 1fr) auto;
  gap: 16px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.change-ver {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--teal);
}

.change-batch {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.change-note {
  color: var(--ink);
}

.change-link a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 13px;
  color: var(--terracotta);
  border-bottom: 1px solid var(--line-strong);
}

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

.history-list {
  margin-top: 22px;
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  border-top: 1px solid var(--line);
}

.history-batch {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--teal);
}

.history-note {
  margin: 0;
  padding: 14px 0 14px 24px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  color: var(--ink-soft);
}

.map-list {
  margin-top: 22px;
  display: grid;
  gap: 16px;
  counter-reset: map;
}

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

.map-item h3 {
  margin-bottom: 6px;
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
}

.map-item p {
  font-size: 14px;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   pages · 站点说明
   -------------------------------------------------------------------------- */

.page-about .page-title-section {
  padding-top: 8px;
}

.page-title-inner {
  max-width: 800px;
}

.page-about .page-lead {
  margin-top: 12px;
}

.content-column {
  max-width: 800px;
  padding-top: 8px;
}

.page-about .content-section {
  padding-top: 48px;
}

.page-about .content-section > p {
  max-width: 42em;
  color: var(--ink-soft);
}

.scope-list {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}

.scope-item {
  position: relative;
  padding-left: 34px;
  font-size: 15px;
  color: var(--ink-soft);
}

.scope-num {
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--terracotta);
}

.boundary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 22px;
}

.boundary-col {
  padding: 20px 22px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.boundary-in {
  border-top: 3px solid var(--teal);
}

.boundary-out {
  border-top: 3px solid var(--terracotta);
}

.boundary-title {
  margin-bottom: 12px;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
}

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

.boundary-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--ink-soft);
}

.boundary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 1.5px;
  background-color: var(--line-strong);
}

.label-examples {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.label-example {
  padding: 16px 20px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.label-example .label-meta {
  margin-bottom: 8px;
}

.label-explain {
  font-size: 14px;
  color: var(--ink-soft);
}

.feedback-list {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

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

.feedback-title {
  margin-bottom: 6px;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
}

.feedback-item p {
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   pages · 404
   -------------------------------------------------------------------------- */

.error-main {
  padding: 0 0 96px;
}

.error-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 88px var(--gutter) 0;
}

.error-tag {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--terracotta);
  margin-bottom: 14px;
}

.error-inner h1 {
  font-family: var(--serif);
  font-size: clamp(28px, 3.2vw, 36px);
  font-weight: 600;
  line-height: 1.32;
  color: var(--ink);
}

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

.error-note {
  margin-top: 10px;
  font-size: 14px;
  color: var(--ink-soft);
}

.error-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.error-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  color: var(--terracotta);
  border-bottom: 1px solid var(--line-strong);
}

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

/* --------------------------------------------------------------------------
   layout · 页脚
   -------------------------------------------------------------------------- */

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

.footer-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px var(--gutter) 32px;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 1fr));
  gap: 40px 36px;
}

.footer-brand-name {
  margin-bottom: 10px;
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
}

.footer-brand-desc {
  max-width: 24em;
  font-size: 14px;
  color: var(--ink-soft);
}

.footer-version {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--teal);
}

.footer-title {
  margin-bottom: 14px;
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.footer-list {
  display: grid;
  gap: 2px;
}

.footer-list a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  font-size: 14px;
  color: var(--ink-soft);
}

.footer-list a:hover {
  color: var(--terracotta);
}

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

.footer-bottom p {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 18px var(--gutter);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

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

@media (max-width: 1024px) {
  :root {
    --gutter: 24px;
  }

  .header-inner {
    gap: 18px;
  }

  .header-version {
    display: none;
  }

  .page-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 288px);
    gap: 36px;
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px;
  }

  .entry-summary {
    gap: 32px;
  }
}

@media (max-width: 900px) {
  .hero-label {
    margin-left: 0;
  }

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

  .cabinet-item:last-child {
    grid-column: 1 / -1;
  }

  .topic-entry {
    grid-template-columns: minmax(0, 220px) minmax(0, 1fr);
    gap: 24px;
  }

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

  .content-aside {
    padding-top: 0;
  }
}

@media (max-width: 768px) {
  .header-inner {
    min-height: 64px;
    gap: 12px;
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: flex;
  }

  .primary-nav.site-nav {
    order: 3;
    flex: 1 0 100%;
    margin-left: 0;
    padding-bottom: 12px;
  }

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

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

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

  .nav-link {
    width: 100%;
    min-height: 48px;
    padding: 0 4px;
    border-bottom: 0;
    font-size: 16px;
  }

  .nav-link.is-current {
    color: var(--terracotta);
  }

  .has-submenu > .nav-link::after {
    margin-left: auto;
  }

  .submenu {
    position: static;
    min-width: 0;
    padding: 0 0 8px;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    display: none;
  }

  .has-submenu.is-open .submenu {
    display: block;
  }

  .submenu li a {
    min-height: 44px;
    padding: 10px 16px;
    font-size: 15px;
  }

  .inner-main {
    padding-bottom: 64px;
  }

  .breadcrumb {
    padding-top: 20px;
  }

  .page-header {
    padding-top: 14px;
  }

  .section {
    padding: 48px 0;
  }

  .hero-wall {
    padding-top: 20px;
  }

  .hero-figure img {
    aspect-ratio: 16 / 10;
  }

  .hero-label {
    margin: -40px 0 0;
    padding: 22px 20px 24px;
  }

  .channel-index-strip {
    margin-top: 24px;
  }

  .strip-list {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
  }

  .strip-item {
    flex: 0 0 62%;
    scroll-snap-align: start;
    border-right: 1px solid var(--line);
  }

  .strip-item a {
    min-height: 88px;
  }

  .index-row {
    grid-template-columns: 56px minmax(0, 1fr) 44px;
    gap: 14px;
    padding: 18px 0;
  }

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

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

  .cabinet-item:last-child {
    grid-column: auto;
  }

  .path-hint .step-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

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

  .version-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
    padding: 14px 0;
  }

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

  .compare-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  .topic-entry {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
    padding: 26px 0;
  }

  .change-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
    padding: 14px 0;
  }

  .change-link a {
    min-height: 40px;
  }

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

  .history-batch {
    padding: 14px 0 2px;
    border-bottom: 0;
  }

  .history-note {
    padding: 0 0 14px;
    border-bottom: 1px solid var(--line);
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
    padding-top: 44px;
  }

  .error-inner {
    padding-top: 56px;
  }
}

@media (max-width: 480px) {
  :root {
    --gutter: 18px;
  }

  body.site-body {
    font-size: 15px;
  }

  .brand-mark {
    font-size: 17px;
  }

  .strip-item {
    flex-basis: 76%;
  }

  .index-row {
    grid-template-columns: 44px minmax(0, 1fr) 40px;
    gap: 10px;
  }

  .row-arrow {
    width: 40px;
    height: 40px;
  }

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

  .btn-primary,
  .btn-secondary {
    flex: 1 1 auto;
    padding: 0 18px;
  }

  .related-links {
    gap: 6px 16px;
  }

  .footer-bottom p {
    padding: 16px var(--gutter);
  }
}

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