/* ==========================================================================
   51黑料网 · 完整样式表
   学术期刊风 · 纸白底 / 墨蓝黑 / 陶土棕
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Base — 变量、重置、全局基础
   -------------------------------------------------------------------------- */
:root {
  --color-paper: #F5F2EA;
  --color-ink: #1F2D3D;
  --color-clay: #8A5A44;
  --color-pine: #3E5C58;
  --color-line: #C9C2B4;
  --color-paper-deep: #EDE8DC;
  --color-white: #FFFFFF;
  --color-ink-soft: #4A5568;
  --color-ink-light: #6B7280;

  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;

  --container-width: 1200px;
  --text-width: 720px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 8px;

  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 64px;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 17px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-ink);
  background-color: var(--color-paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-clay);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul,
ol {
  list-style-position: inside;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-ink);
}

h1 {
  font-size: 2rem;
  letter-spacing: 0.02em;
}

h2 {
  font-size: 1.5rem;
  letter-spacing: 0.01em;
}

h3 {
  font-size: 1.15rem;
}

h4 {
  font-size: 1rem;
}

p {
  margin-bottom: 1em;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 0.95rem;
}

th,
td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-line);
  vertical-align: top;
}

th {
  font-weight: 600;
  background-color: var(--color-paper-deep);
  color: var(--color-ink);
  white-space: nowrap;
}

td {
  color: var(--color-ink-soft);
}

sup.footnote {
  font-family: var(--font-sans);
  font-size: 0.7em;
  color: var(--color-clay);
  cursor: help;
  margin-left: 2px;
  line-height: 1;
}

figure {
  margin: 0;
}

figcaption {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-ink-light);
  line-height: 1.6;
  margin-top: 10px;
  text-align: center;
}

/* --------------------------------------------------------------------------
   2. Layout — 全站骨架
   -------------------------------------------------------------------------- */
.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-line);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 24px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: 0.04em;
}

.brand-name::first-letter {
  color: var(--color-clay);
}

.primary-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 2px;
}

.nav-item {
  display: block;
  padding: 8px 14px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-ink-soft);
  border-radius: var(--radius-sm);
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.nav-item:hover {
  color: var(--color-clay);
  background-color: var(--color-paper);
}

.nav-item.is-current {
  color: var(--color-clay);
  border-bottom-color: var(--color-clay);
  font-weight: 600;
}

.site-main {
  flex: 1;
  width: 100%;
}

.site-main.home-main {
  /* 首页主体 */
}

.site-main.inner-main {
  /* 内页主体 */
}

.site-footer {
  background-color: var(--color-ink);
  color: #CBD5E0;
  margin-top: auto;
}

.footer-columns {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1fr 1fr 1.4fr;
  gap: 40px;
}

.footer-col h3.footer-heading {
  color: var(--color-white);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  letter-spacing: 0.03em;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-links a {
  color: #A0AEC0;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  line-height: 1.6;
  transition: color var(--transition-fast);
}

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

.footer-about p {
  color: #A0AEC0;
  font-size: 0.92rem;
  line-height: 1.75;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 24px;
  text-align: center;
}

.footer-bottom p {
  max-width: var(--container-width);
  margin: 0 auto;
  color: #718096;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   3. Components — 通用组件
   -------------------------------------------------------------------------- */
/* 面包屑 */
.breadcrumb {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 20px 24px 0;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-ink-light);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

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

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

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

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

/* 页面标题区 */
.page-header {
  max-width: var(--text-width);
  margin: 0 auto;
  padding: 40px 24px 16px;
}

.page-title {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 12px;
}

.page-description {
  font-size: 1.05rem;
  color: var(--color-ink-soft);
  line-height: 1.75;
}

/* 按钮 */
.btn {
  display: inline-block;
  padding: 12px 24px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-align: center;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-clay);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: #7A4C38;
  color: var(--color-white);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-pine);
  border-color: var(--color-pine);
}

.btn-secondary:hover {
  background-color: var(--color-pine);
  color: var(--color-white);
  transform: translateY(-1px);
}

/* 区块标题 */
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
  position: relative;
  padding-bottom: 12px;
}

.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 48px;
  height: 3px;
  background-color: var(--color-clay);
}

.section-intro {
  font-size: 1rem;
  color: var(--color-ink-soft);
  margin-bottom: 24px;
  max-width: 680px;
}

/* 文本链接 */
.text-link {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--color-clay);
  gap: 6px;
  transition: color var(--transition-fast), gap var(--transition-fast);
}

.text-link::after {
  content: "→";
  font-size: 1.1em;
  line-height: 1;
}

.text-link:hover {
  color: var(--color-pine);
  gap: 10px;
}

/* 服务表格 */
.service-table {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 16px;
}

.service-table th {
  border-bottom: 2px solid var(--color-line);
  font-size: 0.92rem;
  letter-spacing: 0.02em;
}

.service-table td {
  font-size: 0.92rem;
  line-height: 1.7;
}

.service-table tbody tr {
  transition: background-color var(--transition-fast);
}

.service-table tbody tr:hover {
  background-color: #FAF7F0;
}

.table-footnote {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--color-ink-light);
  margin-top: 8px;
  line-height: 1.7;
}

/* 时间线 */
.timeline-list {
  list-style: none;
  position: relative;
}

.timeline-item {
  position: relative;
  padding: 0 0 24px 28px;
  border-left: 2px solid var(--color-line);
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-paper);
  border: 3px solid var(--color-clay);
}

.timeline-item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.timeline-date {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-clay);
  background-color: var(--color-paper-deep);
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
}

/* 相关链接导航 */
.related-links {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  border-top: 1px solid var(--color-line);
}

.related-links-label {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-ink);
  margin-right: 8px;
}

.related-links-item {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--color-clay);
  padding: 6px 14px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.related-links-item:hover {
  border-color: var(--color-clay);
  background-color: var(--color-white);
}

/* FAQ 手风琴 */
.faq-item {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  font-family: var(--font-sans);
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 48px;
  transition: background-color var(--transition-fast);
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--color-clay);
  transition: transform var(--transition-normal);
}

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

.faq-item[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

.faq-item summary:hover {
  background-color: var(--color-paper);
}

.faq-answer {
  padding: 0 20px 16px;
  border-top: 1px solid var(--color-line);
}

.faq-answer p {
  padding-top: 14px;
  font-size: 0.95rem;
  color: var(--color-ink-soft);
  line-height: 1.75;
}

/* 图片容器 */
.content-media,
.hero-figure,
.service-figure,
.selection-intro-figure,
.version-figure,
.guide-figure,
.faq-intro-media,
.about-figure,
.section-figure,
.map-figure {
  margin: 0;
}

.content-media img,
.hero-figure img,
.service-figure img,
.selection-intro-figure img,
.version-figure img,
.guide-figure img,
.faq-intro-media img,
.about-figure img,
.section-figure img,
.map-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  object-fit: cover;
}

/* --------------------------------------------------------------------------
   4. Pages — 首页
   -------------------------------------------------------------------------- */
/* Hero 区 */
.hero-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 24px;
}

.hero-content {
  max-width: var(--text-width);
}

.hero-title {
  font-size: 2.1rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--color-pine);
  font-weight: 600;
  margin-bottom: 12px;
  line-height: 1.6;
}

.hero-summary {
  font-size: 1.02rem;
  color: var(--color-ink-soft);
  line-height: 1.8;
  margin-bottom: 24px;
}

.hero-content .btn-primary {
  margin-bottom: 32px;
}

.hero-figure {
  margin-top: 24px;
}

.hero-image {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  object-fit: cover;
}

/* 首页主内容配图 */
.content-media-primary {
  margin: 24px 0;
}

.content-media-primary img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

/* 摘要区 */
.abstract-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px;
}

.abstract-content {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 32px;
  position: relative;
}

.abstract-content::before {
  content: "摘要";
  position: absolute;
  top: -12px;
  left: 24px;
  background-color: var(--color-clay);
  color: var(--color-white);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 2px 14px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.05em;
}

.abstract-text {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-ink-soft);
  margin-bottom: 20px;
}

.abstract-points {
  list-style: none;
  padding: 0;
}

.abstract-points li {
  position: relative;
  padding: 8px 0 8px 28px;
  font-size: 0.95rem;
  color: var(--color-ink-soft);
  border-bottom: 1px dashed var(--color-line);
}

.abstract-points li:last-child {
  border-bottom: none;
}

.abstract-points li::before {
  content: "·";
  position: absolute;
  left: 8px;
  color: var(--color-clay);
  font-weight: 700;
  font-size: 1.3rem;
  line-height: 1;
}

/* 服务索引预览 */
.service-index-preview {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px;
  border-top: 1px solid var(--color-line);
}

.service-index-preview .service-table {
  margin-bottom: 12px;
}

.service-index-preview .table-footnote {
  margin-bottom: 16px;
}

/* 推荐组合摘要 */
.recommend-summary {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px;
  border-top: 1px solid var(--color-line);
}

.recommend-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 24px;
}

.recommend-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.recommend-item:hover {
  box-shadow: 0 4px 16px rgba(31, 45, 61, 0.08);
  transform: translateY(-2px);
}

.recommend-item h3 {
  font-size: 1.05rem;
  margin-bottom: 10px;
  color: var(--color-ink);
  position: relative;
  padding-left: 16px;
}

.recommend-item h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 4px;
  height: 16px;
  background-color: var(--color-clay);
  border-radius: 2px;
}

.recommend-item p {
  font-size: 0.92rem;
  color: var(--color-ink-soft);
  line-height: 1.7;
  margin-bottom: 16px;
}

.recommend-item .text-link {
  font-size: 0.88rem;
}

/* 使用指南入口 */
.guide-entry {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px;
  border-top: 1px solid var(--color-line);
}

.step-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-bottom: 28px;
  counter-reset: step-counter;
}

.step-list li {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  text-align: center;
  position: relative;
  counter-increment: step-counter;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.step-list li:hover {
  border-color: var(--color-clay);
  box-shadow: 0 2px 12px rgba(138, 90, 68, 0.1);
}

.step-list li::before {
  content: counter(step-counter, decimal-leading-zero);
  display: block;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-clay);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
}

.step-name {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 6px;
}

.step-desc {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--color-ink-light);
  line-height: 1.5;
}

.guide-entry .btn-secondary {
  margin-top: 8px;
}

/* 版本记录摘要 */
.versions-summary {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px;
  border-top: 1px solid var(--color-line);
}

.versions-summary .timeline-list {
  margin-bottom: 20px;
}

.versions-summary .timeline-item p {
  font-size: 0.92rem;
  color: var(--color-ink-soft);
  line-height: 1.7;
}

/* 常见问题入口 */
.faq-entry {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px;
  border-top: 1px solid var(--color-line);
}

.faq-preview-list {
  margin-bottom: 20px;
}

.faq-preview-item {
  border-bottom: 1px solid var(--color-line);
  padding: 16px 0;
}

.faq-preview-item:last-child {
  border-bottom: none;
}

.faq-preview-item summary {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 40px;
  transition: color var(--transition-fast);
}

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

.faq-preview-item summary::after {
  content: "+";
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-clay);
  font-size: 1.2rem;
  font-weight: 400;
  transition: transform var(--transition-normal);
}

.faq-preview-item[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

.faq-preview-item summary:hover {
  color: var(--color-clay);
}

.faq-preview-item p {
  padding-top: 12px;
  font-size: 0.92rem;
  color: var(--color-ink-soft);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   5. Pages — 内页通用
   -------------------------------------------------------------------------- */
.page-title-area {
  max-width: var(--text-width);
  margin: 0 auto;
  padding: 0 24px 32px;
}

.page-title-desc,
.page-title-description,
.page-intro,
.page-lead,
.heading-summary {
  font-size: 1.02rem;
  color: var(--color-ink-soft);
  line-height: 1.8;
}

/* 内页区块通用 */
.inner-main section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px;
  border-top: 1px solid var(--color-line);
}

.inner-main section:first-of-type {
  border-top: none;
}

/* --------------------------------------------------------------------------
   6. Pages — 服务分类页
   -------------------------------------------------------------------------- */
.service-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.intro-text p {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-ink-soft);
}

.service-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.classification-logic {
  grid-column: 1 / -1;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
}

.classification-logic h2 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.classification-logic p {
  font-size: 0.95rem;
  color: var(--color-ink-soft);
  line-height: 1.75;
}

.service-table-section {
  /* 表格区块 */
}

.related-recommend {
  /* 相关推荐 */
}

.related-recommend .related-links {
  list-style: none;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  padding: 0;
  border: none;
}

.related-recommend .related-links li a {
  display: inline-block;
  padding: 10px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--color-clay);
  transition: all var(--transition-fast);
}

.related-recommend .related-links li a:hover {
  border-color: var(--color-clay);
  background-color: var(--color-paper-deep);
}

/* --------------------------------------------------------------------------
   7. Pages — 推荐清单页
   -------------------------------------------------------------------------- */
.selection-intro {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  align-items: start;
}

.selection-intro-content h2 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.selection-intro-content p {
  font-size: 0.98rem;
  color: var(--color-ink-soft);
  line-height: 1.8;
}

.selection-intro-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.recommend-scenarios {
  /* 场景卡片 */
}

.scenario-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  overflow: hidden;
  transition: box-shadow var(--transition-fast);
}

.scenario-card:hover {
  box-shadow: 0 4px 16px rgba(31, 45, 61, 0.08);
}

.scenario-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background-color: var(--color-paper-deep);
  border-bottom: 1px solid var(--color-line);
}

.scenario-number {
  font-family: var(--font-sans);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-clay);
  background-color: var(--color-white);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-clay);
  flex-shrink: 0;
}

.scenario-header h3 {
  font-size: 1.2rem;
  margin: 0;
}

.scenario-body {
  padding: 24px;
}

.scenario-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

.meta-item {
  padding: 12px 16px;
  background-color: var(--color-paper);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-clay);
}

.meta-item dt {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-clay);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.meta-item dd {
  font-size: 0.92rem;
  color: var(--color-ink-soft);
  line-height: 1.6;
}

.scenario-action {
  text-align: right;
  padding-top: 16px;
  border-top: 1px solid var(--color-line);
}

.scenario-action a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--color-clay);
}

.scenario-action a::after {
  content: "→";
  font-size: 1.1em;
}

.scenario-action a:hover {
  color: var(--color-pine);
  gap: 10px;
}

/* 选择提示 */
.selection-tips .tips-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

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

.tip-item h3 {
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--color-ink);
  position: relative;
  padding-left: 14px;
}

.tip-item h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 4px;
  height: 14px;
  background-color: var(--color-pine);
  border-radius: 2px;
}

.tip-item p {
  font-size: 0.9rem;
  color: var(--color-ink-soft);
  line-height: 1.7;
}

/* 延伸阅读 */
.further-reading .reading-list {
  list-style: none;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.further-reading .reading-list li a {
  display: inline-block;
  padding: 10px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--color-clay);
  transition: all var(--transition-fast);
}

.further-reading .reading-list li a:hover {
  border-color: var(--color-clay);
}

/* --------------------------------------------------------------------------
   8. Pages — 版本记录页
   -------------------------------------------------------------------------- */
.version-intro {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  align-items: start;
}

.version-intro-content p {
  font-size: 0.98rem;
  color: var(--color-ink-soft);
  line-height: 1.8;
}

.version-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.version-anchor-nav {
  /* 锚点导航 */
}

.anchor-list {
  list-style: none;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.anchor-list li a {
  display: inline-block;
  padding: 8px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-ink-soft);
  transition: all var(--transition-fast);
}

.anchor-list li a:hover {
  border-color: var(--color-clay);
  color: var(--color-clay);
}

.timeline-section {
  /* 时间线分区 */
}

.timeline-section .timeline-list {
  /* 每条时间线 */
}

.timeline-item {
  /* 单条时间线 */
}

.timeline-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.timeline-version {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-clay);
  background-color: var(--color-paper-deep);
  padding: 2px 12px;
  border-radius: var(--radius-sm);
}

.timeline-meta time {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-ink-light);
}

.timeline-body h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.timeline-body p {
  font-size: 0.92rem;
  color: var(--color-ink-soft);
  line-height: 1.7;
}

.timeline-scope {
  font-size: 0.85rem !important;
  color: var(--color-ink-light) !important;
  font-family: var(--font-sans);
  margin-top: 6px;
}

/* 版本阅读说明 */
.version-reading-note .note-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

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

.note-item h3 {
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--color-ink);
}

.note-item p {
  font-size: 0.9rem;
  color: var(--color-ink-soft);
  line-height: 1.7;
}

/* 相关链接 */
.related-links .related-list {
  list-style: none;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.related-links .related-list li a {
  display: inline-block;
  padding: 10px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--color-clay);
  transition: all var(--transition-fast);
}

.related-links .related-list li a:hover {
  border-color: var(--color-clay);
}

.related-links .related-list li span {
  display: block;
  font-size: 0.82rem;
  color: var(--color-ink-light);
  margin-top: 4px;
}

/* --------------------------------------------------------------------------
   9. Pages — 使用指南页
   -------------------------------------------------------------------------- */
.guide-overview {
  /* 周期概览 */
}

.guide-overview > p {
  font-size: 0.98rem;
  color: var(--color-ink-soft);
  line-height: 1.8;
  margin-bottom: 20px;
}

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

.guide-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

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

.guide-stages {
  /* 阶段说明 */
}

.stage-block {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 28px;
  margin-bottom: 24px;
  position: relative;
}

.stage-block > h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  color: var(--color-ink);
  position: relative;
  padding-left: 18px;
}

.stage-block > h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 5px;
  height: 20px;
  background-color: var(--color-clay);
  border-radius: 2px;
}

.stage-block > p {
  font-size: 0.95rem;
  color: var(--color-ink-soft);
  line-height: 1.8;
  margin-bottom: 16px;
}

.stage-steps {
  list-style: none;
  counter-reset: stage-step;
  margin-bottom: 16px;
}

.stage-steps li {
  counter-increment: stage-step;
  position: relative;
  padding: 6px 0 6px 36px;
  font-size: 0.93rem;
  color: var(--color-ink-soft);
  line-height: 1.7;
}

.stage-steps li::before {
  content: counter(stage-step);
  position: absolute;
  left: 0;
  top: 8px;
  width: 24px;
  height: 24px;
  background-color: var(--color-paper-deep);
  border: 1px solid var(--color-line);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-clay);
}

.stage-block h4 {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-pine);
  margin: 16px 0 8px;
  letter-spacing: 0.03em;
}

.material-list {
  list-style: none;
  margin-bottom: 12px;
}

.material-list li {
  position: relative;
  padding: 4px 0 4px 20px;
  font-size: 0.9rem;
  color: var(--color-ink-soft);
  line-height: 1.7;
}

.material-list li::before {
  content: "▪";
  position: absolute;
  left: 4px;
  color: var(--color-pine);
  font-size: 0.9rem;
}

.stage-output {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--color-clay);
  background-color: var(--color-paper);
  border-left: 3px solid var(--color-clay);
  padding: 10px 16px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-top: 12px;
}

/* 指南备注 */
.guide-notes {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
}

.guide-notes h2 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.guide-notes p {
  font-size: 0.92rem;
  color: var(--color-ink-soft);
  line-height: 1.75;
}

/* 延伸阅读 */
.related-reading .related-list {
  list-style: none;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.related-reading .related-list li a {
  display: inline-block;
  padding: 10px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--color-clay);
  transition: all var(--transition-fast);
}

.related-reading .related-list li a:hover {
  border-color: var(--color-clay);
}

/* --------------------------------------------------------------------------
   10. Pages — 许可说明页
   -------------------------------------------------------------------------- */
.page-heading {
  max-width: var(--text-width);
  margin: 0 auto;
  padding: 0 24px 24px;
}

.license-section {
  /* 许可摘要 */
}

.section-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  align-items: start;
}

.section-copy h2 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.section-copy p {
  font-size: 0.98rem;
  color: var(--color-ink-soft);
  line-height: 1.85;
}

.section-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.license-groups {
  /* 条款分组 */
}

.license-group {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 20px;
}

.license-group h3 {
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: var(--color-ink);
  position: relative;
  padding-left: 14px;
}

.license-group h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 4px;
  height: 16px;
  background-color: var(--color-clay);
  border-radius: 2px;
}

.license-list {
  list-style: none;
}

.license-list li {
  position: relative;
  padding: 6px 0 6px 24px;
  font-size: 0.92rem;
  color: var(--color-ink-soft);
  line-height: 1.75;
  border-bottom: 1px dashed var(--color-line);
}

.license-list li:last-child {
  border-bottom: none;
}

.license-list li::before {
  content: "§";
  position: absolute;
  left: 4px;
  color: var(--color-clay);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.9rem;
}

.compliance-section {
  /* 合规声明 */
}

.compliance-list {
  list-style: none;
  counter-reset: compliance-counter;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.compliance-list li {
  counter-increment: compliance-counter;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  position: relative;
  font-size: 0.92rem;
  color: var(--color-ink-soft);
  line-height: 1.7;
  padding-top: 48px;
}

.compliance-list li::before {
  content: counter(compliance-counter, decimal-leading-zero);
  position: absolute;
  top: 16px;
  left: 20px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-clay);
  letter-spacing: 0.04em;
}

/* 延伸阅读 */
.related-title {
  font-size: 1.2rem;
  margin-bottom: 16px;
}

/* --------------------------------------------------------------------------
   11. Pages — 常见问题页
   -------------------------------------------------------------------------- */
.faq-intro {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  align-items: start;
}

.faq-intro-content h2 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.faq-intro-content p {
  font-size: 0.98rem;
  color: var(--color-ink-soft);
  line-height: 1.8;
}

.faq-intro-media img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.faq-groups {
  /* FAQ 分组 */
}

.faq-group {
  margin-bottom: 32px;
}

.faq-group > h3 {
  font-size: 1.15rem;
  margin-bottom: 16px;
  color: var(--color-ink);
  position: relative;
  padding-left: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-paper-deep);
}

.faq-group > h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 4px;
  height: 20px;
  background-color: var(--color-clay);
  border-radius: 2px;
}

.faq-related .related-links {
  list-style: none;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  padding: 0;
  border: none;
}

.faq-related .related-links li a {
  display: inline-block;
  padding: 10px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--color-clay);
  transition: all var(--transition-fast);
}

.faq-related .related-links li a:hover {
  border-color: var(--color-clay);
}

/* --------------------------------------------------------------------------
   12. Pages — 关于我们页
   -------------------------------------------------------------------------- */
.about-summary {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  align-items: start;
}

.summary-text h2 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.summary-text p {
  font-size: 0.98rem;
  color: var(--color-ink-soft);
  line-height: 1.85;
}

.about-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.about-section {
  /* 定位书章节 */
}

.about-section h2 {
  font-size: 1.3rem;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}

.about-section h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 40px;
  height: 3px;
  background-color: var(--color-clay);
}

.about-section p {
  font-size: 0.96rem;
  color: var(--color-ink-soft);
  line-height: 1.85;
  margin-bottom: 12px;
}

.about-section p:last-child {
  margin-bottom: 0;
}

.about-section .related-list {
  list-style: none;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.about-section .related-list li a {
  display: inline-block;
  padding: 10px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--color-clay);
  transition: all var(--transition-fast);
}

.about-section .related-list li a:hover {
  border-color: var(--color-clay);
}

/* --------------------------------------------------------------------------
   13. Pages — 站点地图页
   -------------------------------------------------------------------------- */
.page-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.page-heading-area {
  padding: 24px 0;
}

.map-intro {
  padding: 16px 0;
}

.map-intro-text {
  font-size: 0.98rem;
  color: var(--color-ink-soft);
  line-height: 1.8;
}

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

.map-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.map-group {
  padding: 24px 0;
  border-top: 1px solid var(--color-line);
}

.map-group-title {
  font-size: 1.3rem;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 10px;
}

.map-group-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 40px;
  height: 3px;
  background-color: var(--color-clay);
}

.map-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.map-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: box-shadow var(--transition-fast);
}

.map-item:hover {
  box-shadow: 0 2px 12px rgba(31, 45, 61, 0.08);
}

.map-link {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-clay);
  margin-bottom: 6px;
}

.map-link:hover {
  color: var(--color-pine);
}

.map-desc {
  font-size: 0.88rem;
  color: var(--color-ink-light);
  line-height: 1.6;
}

.map-return {
  padding: 32px 0 48px;
  text-align: center;
}

.return-link {
  display: inline-block;
  padding: 12px 32px;
  background-color: var(--color-clay);
  color: var(--color-white);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  transition: background-color var(--transition-fast);
}

.return-link:hover {
  background-color: #7A4C38;
  color: var(--color-white);
}

/* --------------------------------------------------------------------------
   14. Pages — 404 页
   -------------------------------------------------------------------------- */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px 24px;
}

.error-section {
  text-align: center;
  max-width: 560px;
}

.error-code {
  font-family: var(--font-sans);
  font-size: 4.5rem;
  font-weight: 700;
  color: var(--color-clay);
  line-height: 1.2;
  margin-bottom: 8px;
  letter-spacing: 0.06em;
}

.error-section h1 {
  font-size: 1.6rem;
  margin-bottom: 16px;
}

.error-desc {
  font-size: 1rem;
  color: var(--color-ink-soft);
  line-height: 1.8;
  margin-bottom: 24px;
}

.error-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.error-tip {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-ink-light);
}

/* --------------------------------------------------------------------------
   15. Responsive — 响应式
   -------------------------------------------------------------------------- */
/* 平板 1024px */
@media (max-width: 1024px) {
  .footer-columns {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .footer-about {
    grid-column: 1 / -1;
  }

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

  .step-list {
    grid-template-columns: repeat(3, 1fr);
  }

  .scenario-meta {
    grid-template-columns: 1fr;
  }

  .timeline-section .timeline-list {
    /* 保持时间线 */
  }

  .compliance-list {
    grid-template-columns: 1fr;
  }

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

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

/* 手机 768px */
@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
    min-height: 60px;
    gap: 12px;
  }

  .brand-name {
    font-size: 1.15rem;
  }

  .primary-nav {
    order: 3;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    position: relative;
    padding-bottom: 4px;
  }

  .primary-nav::-webkit-scrollbar {
    display: none;
  }

  .nav-list {
    display: flex;
    flex-wrap: nowrap;
    gap: 4px;
    padding: 4px 0;
    min-width: max-content;
  }

  .nav-item {
    padding: 8px 14px;
    font-size: 0.85rem;
    white-space: nowrap;
    border-bottom: none;
    border-radius: var(--radius-sm);
    background-color: var(--color-paper);
  }

  .nav-item.is-current {
    background-color: var(--color-clay);
    color: var(--color-white);
    border-bottom: none;
  }

  /* 首页 hero */
  .hero-section {
    padding: 32px 16px 16px;
  }

  .hero-title {
    font-size: 1.6rem;
    line-height: 1.45;
  }

  .hero-subtitle {
    font-size: 1.05rem;
  }

  /* 摘要区 */
  .abstract-section {
    padding: 16px;
  }

  .abstract-content {
    padding: 24px 20px;
  }

  /* 服务索引 */
  .service-index-preview {
    padding: 24px 16px;
  }

  .service-table {
    overflow-x: auto;
    display: block;
    border: none;
  }

  .service-table thead {
    display: none;
  }

  .service-table tbody {
    display: block;
  }

  .service-table tbody tr {
    display: block;
    background-color: var(--color-white);
    border: 1px solid var(--color-line);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    padding: 16px;
  }

  .service-table tbody tr:hover {
    background-color: var(--color-white);
  }

  .service-table td {
    display: block;
    border: none;
    padding: 6px 0;
    font-size: 0.9rem;
  }

  .service-table td::before {
    content: attr(data-label);
    display: block;
    font-family: var(--font-sans);
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--color-clay);
    letter-spacing: 0.03em;
    margin-bottom: 2px;
    text-transform: uppercase;
  }

  /* 推荐组合 */
  .recommend-summary {
    padding: 24px 16px;
  }

  .recommend-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 步骤条 */
  .guide-entry {
    padding: 24px 16px;
  }

  .step-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .step-list li {
    display: flex;
    align-items: center;
    text-align: left;
    padding: 14px 16px;
    gap: 12px;
  }

  .step-list li::before {
    margin: 0;
    flex-shrink: 0;
    font-size: 0.8rem;
  }

  .step-name {
    margin: 0;
    flex-shrink: 0;
  }

  .step-desc {
    font-size: 0.82rem;
  }

  /* 版本摘要 */
  .versions-summary {
    padding: 24px 16px;
  }

  /* FAQ 入口 */
  .faq-entry {
    padding: 24px 16px;
  }

  /* 页脚 */
  .footer-columns {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 16px 24px;
  }

  .footer-about {
    grid-column: auto;
  }

  .footer-bottom {
    padding: 16px;
  }

  /* 内页通用 */
  .breadcrumb {
    padding: 16px 16px 0;
  }

  .page-header {
    padding: 24px 16px 12px;
  }

  .page-title {
    font-size: 1.5rem;
    line-height: 1.4;
  }

  .page-title-area {
    padding: 0 16px 24px;
  }

  .inner-main section {
    padding: 24px 16px;
  }

  /* 服务分类页 */
  .service-intro {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .classification-logic {
    grid-column: auto;
  }

  /* 推荐清单页 */
  .selection-intro {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .scenario-header {
    padding: 16px;
  }

  .scenario-body {
    padding: 16px;
  }

  .scenario-meta {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .tips-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 版本记录页 */
  .version-intro {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .note-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 使用指南页 */
  .guide-overview {
    /* 周期概览 */
  }

  .period-table {
    overflow-x: auto;
    display: block;
    border: none;
  }

  .period-table thead {
    display: none;
  }

  .period-table tbody {
    display: block;
  }

  .period-table tbody tr {
    display: block;
    background-color: var(--color-white);
    border: 1px solid var(--color-line);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    padding: 16px;
  }

  .period-table td {
    display: block;
    border: none;
    padding: 6px 0;
  }

  .period-table td::before {
    content: attr(data-label);
    display: block;
    font-family: var(--font-sans);
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--color-clay);
    letter-spacing: 0.03em;
    margin-bottom: 2px;
  }

  .stage-block {
    padding: 20px 16px;
  }

  /* 许可说明页 */
  .section-inner {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .compliance-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* FAQ 页 */
  .faq-intro {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .faq-item summary {
    padding: 14px 44px 14px 16px;
    font-size: 0.92rem;
  }

  .faq-item summary::after {
    right: 16px;
  }

  .faq-answer {
    padding: 0 16px 14px;
  }

  /* 关于页 */
  .about-summary {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  /* 站点地图 */
  .page-container {
    padding: 0 16px;
  }

  .map-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .map-item {
    padding: 16px;
  }

  /* 404 */
  .error-main {
    padding: 32px 16px;
  }

  .error-code {
    font-size: 3.5rem;
  }

  .error-actions {
    flex-direction: column;
    align-items: center;
  }

  .error-actions .btn {
    width: 100%;
    max-width: 280px;
  }

  /* 相关链接 */
  .related-links {
    padding: 32px 16px;
    gap: 8px;
  }

  .related-links-label {
    width: 100%;
    margin-bottom: 4px;
  }
}

/* 小屏 390px 额外优化 */
@media (max-width: 390px) {
  .brand-name {
    font-size: 1.05rem;
  }

  .hero-title {
    font-size: 1.4rem;
  }

  .hero-subtitle {
    font-size: 0.98rem;
  }

  .hero-summary {
    font-size: 0.95rem;
  }

  .abstract-content {
    padding: 20px 16px;
  }

  .abstract-text {
    font-size: 0.95rem;
  }

  .abstract-points li {
    font-size: 0.9rem;
    padding-left: 24px;
  }

  .section-title {
    font-size: 1.3rem;
  }

  .section-intro {
    font-size: 0.95rem;
  }

  .service-table td {
    font-size: 0.88rem;
  }

  .recommend-item {
    padding: 20px 16px;
  }

  .recommend-item h3 {
    font-size: 1rem;
  }

  .recommend-item p {
    font-size: 0.88rem;
  }

  .step-list li {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .step-name {
    font-size: 0.9rem;
  }

  .step-desc {
    font-size: 0.8rem;
  }

  .timeline-item {
    padding-left: 20px;
  }

  .timeline-item::before {
    left: -6px;
    width: 10px;
    height: 10px;
  }

  .page-title {
    font-size: 1.35rem;
  }

  .page-description {
    font-size: 0.95rem;
  }

  .page-title-desc,
  .page-title-description,
  .page-intro,
  .page-lead,
  .heading-summary {
    font-size: 0.95rem;
  }

  .scenario-header h3 {
    font-size: 1.05rem;
  }

  .scenario-number {
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }

  .meta-item {
    padding: 10px 12px;
  }

  .meta-item dt {
    font-size: 0.78rem;
  }

  .meta-item dd {
    font-size: 0.88rem;
  }

  .stage-block {
    padding: 16px 12px;
  }

  .stage-block > h3 {
    font-size: 1.05rem;
  }

  .stage-steps li {
    font-size: 0.88rem;
    padding-left: 32px;
  }

  .material-list li {
    font-size: 0.88rem;
  }

  .license-group {
    padding: 16px;
  }

  .license-list li {
    font-size: 0.88rem;
  }

  .faq-group > h3 {
    font-size: 1.05rem;
  }

  .faq-item summary {
    font-size: 0.88rem;
  }

  .faq-answer p {
    font-size: 0.88rem;
  }

  .map-link {
    font-size: 0.95rem;
  }

  .map-desc {
    font-size: 0.85rem;
  }

  .footer-heading {
    font-size: 0.95rem;
  }

  .footer-links a {
    font-size: 0.85rem;
  }

  .footer-about p {
    font-size: 0.88rem;
  }
}

/* --------------------------------------------------------------------------
   16. Utilities — 工具类与动效增强
   -------------------------------------------------------------------------- */
/* 滚动出现动画（内容初始可见，仅作为增强） */
@keyframes fadeInUp {
  from {
    opacity: 0.6;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 行 hover 效果已内置在表格和卡片中 */

/* 焦点可见性 */
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--color-clay);
  outline-offset: 2px;
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}