/* ==========================================================
   轻漫屋 - 全站样式表
   设计方向：技术工作台风格，中性底色、紧凑控件、状态清楚
   目录：
   1. Base         —— 变量、重置、全局基础
   2. Layout       —— 页头、页脚、布局外壳、侧栏
   3. Components   —— 面包屑、卡片、列表、表格、FAQ、示例框
   4. Pages        —— 首页、内页、404
   5. Responsive   —— 768px 断点
   ========================================================== */

/* ==========================================================
   1. Base
   ========================================================== */
:root {
  --color-bg: #f5f6f7;
  --color-surface: #ffffff;
  --color-text: #2c3e50;
  --color-text-secondary: #5d6d7e;
  --color-border: #dde3e8;
  --color-accent: #3498db;
  --color-accent-dark: #2471a3;
  --color-accent-light: #ebf5fb;
  --color-muted: #ecf0f1;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-sm: 0 1px 2px rgba(44, 62, 80, 0.06);
  --shadow-md: 0 2px 8px rgba(44, 62, 80, 0.08);
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: var(--color-accent-dark);
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
  margin-bottom: 16px;
}

h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

p {
  margin-bottom: 12px;
}

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

/* ==========================================================
   2. Layout
   ========================================================== */

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

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.01em;
}

.brand-slogan {
  font-size: 13px;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
}

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

.nav-list li a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast),
    color var(--transition-fast);
}

.nav-list li a:hover {
  color: var(--color-text);
  background-color: var(--color-muted);
}

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

/* 汉堡按钮（默认隐藏） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  margin-top: 64px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 24px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
  max-width: 420px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
}

.footer-group h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-text);
}

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

.footer-group ul li a {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.footer-group ul li a:hover {
  color: var(--color-accent);
}

.footer-copyright {
  padding-top: 20px;
  text-align: center;
}

.footer-copyright p {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* ---------- 主内容区 ---------- */
.site-main {
  min-height: 60vh;
}

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px;
}

/* ---------- 布局外壳（侧栏 + 主内容） ---------- */
.layout-shell {
  display: flex;
  gap: 32px;
  align-items: flex-start;
}

.layout-shell.sidebar-left {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px;
}

/* 侧栏 */
.sidebar,
.sidebar-nav,
.page-aside {
  flex-shrink: 0;
  width: 240px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: 88px;
}

.sidebar-inner h2,
.sidebar-nav h3,
.aside-nav h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 14px;
  color: var(--color-text);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-nav .sidebar-group {
  margin-bottom: 24px;
}

.sidebar-nav .sidebar-group:last-child {
  margin-bottom: 0;
}

.sidebar-list li,
.sidebar-links li,
.aside-nav ul li {
  margin-bottom: 4px;
}

.sidebar-list li a,
.sidebar-links li a,
.aside-nav ul li a {
  display: block;
  padding: 7px 12px;
  font-size: 14px;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast),
    color var(--transition-fast);
}

.sidebar-list li a:hover,
.sidebar-links li a:hover,
.aside-nav ul li a:hover {
  color: var(--color-text);
  background-color: var(--color-muted);
}

.sidebar-list li a.is-active,
.sidebar-links li a.is-active,
.aside-nav ul li a.is-active {
  color: var(--color-accent);
  background-color: var(--color-accent-light);
  font-weight: 500;
}

.sidebar-inner p {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

/* 侧栏在前时（.sidebar-left 的直接子元素） */
.sidebar-left > .sidebar,
.sidebar-left > .sidebar-nav,
.sidebar-left > .page-aside {
  order: -1;
}

/* 主内容区（侧栏之后的宽列） */
.sidebar-left > .inner-main,
.sidebar-left > .content-area,
.sidebar-left > .page-content {
  flex: 1;
  min-width: 0;
}

/* 内容区域 */
.content-area,
.page-content {
  flex: 1;
  min-width: 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  flex-wrap: wrap;
}

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

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

.breadcrumb-sep {
  color: var(--color-border);
  font-size: 12px;
}

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

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

.page-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 10px;
}

.page-description {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ==========================================================
   3. Components
   ========================================================== */

/* ---------- 内容区块 ---------- */
.content-section {
  margin-bottom: 40px;
}

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

.content-section h2 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-muted);
}

.content-section > p {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ---------- 列表（服务范围、边界、更新） ---------- */
.scope-list li,
.boundary-list li,
.update-list li {
  display: flex;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-muted);
  font-size: 15px;
  line-height: 1.6;
}

.scope-list li:last-child,
.boundary-list li:last-child,
.update-list li:last-child {
  border-bottom: none;
}

.scope-list li strong,
.boundary-list li strong,
.update-list li strong {
  flex-shrink: 0;
  min-width: 88px;
  font-weight: 600;
  color: var(--color-text);
}

/* ---------- 步骤列表 ---------- */
.steps-list,
.step-list {
  counter-reset: step-counter;
}

.steps-list li,
.step-list li {
  position: relative;
  padding: 14px 0 14px 48px;
  border-bottom: 1px solid var(--color-muted);
  counter-increment: step-counter;
}

.steps-list li:last-child,
.step-list li:last-child {
  border-bottom: none;
}

.steps-list li h3,
.step-list li h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.steps-list li p,
.step-list li p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 0;
  line-height: 1.6;
}

.steps-list li::before,
.step-list li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 14px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 14px;
  font-weight: 600;
  border-radius: 50%;
}

/* ---------- 表格 ---------- */
.guide-table,
.data-table {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 16px 0;
  font-size: 14px;
}

.guide-table thead th,
.data-table thead th {
  background-color: var(--color-muted);
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 14px;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
}

.guide-table tbody td,
.data-table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-muted);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

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

.guide-table tbody tr:hover,
.data-table tbody tr:hover {
  background-color: var(--color-bg);
}

/* ---------- 示例框 ---------- */
.example-box {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 16px;
}

.example-box h3 {
  font-size: 15px;
  margin-bottom: 8px;
}

.example-box p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
  line-height: 1.6;
}

.example-box p:last-child {
  margin-bottom: 0;
}

/* ---------- 示例块（计算工具） ---------- */
.example-block {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 20px;
}

.example-block h3 {
  font-size: 16px;
  margin-bottom: 10px;
  color: var(--color-text);
}

.example-block p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ---------- FAQ ---------- */
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 10px;
  background-color: var(--color-surface);
  overflow: hidden;
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
  transition: background-color var(--transition-fast);
}

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

.faq-item summary::after {
  content: "+";
  font-size: 18px;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

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

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

.faq-item p {
  padding: 0 18px 14px;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ---------- 图片容器 ---------- */
figure {
  margin: 20px 0;
}

figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

figcaption {
  font-size: 13px;
  color: var(--color-text-secondary);
  text-align: center;
  padding: 8px 0 0;
  line-height: 1.5;
}

/* 内容区图片（about） */
.content-figure img {
  max-height: 320px;
  object-fit: cover;
}

/* 指南页图片 */
.guide-figure img {
  max-height: 300px;
  object-fit: cover;
}

/* 计算工具示例图 */
.example-figure img {
  max-height: 220px;
  object-fit: contain;
  background-color: var(--color-surface);
  padding: 8px;
}

/* 转换工具媒体块 */
.media-block img {
  max-height: 260px;
  object-fit: cover;
}

/* ---------- 相关链接 ---------- */
.related-links {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.related-links p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.related-links p a {
  margin-right: 16px;
  display: inline-block;
  padding: 4px 0;
}

.related-list li,
.related-links ul li {
  margin-bottom: 8px;
  padding-left: 16px;
  position: relative;
}

.related-list li::before,
.related-links ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.related-list li a,
.related-links ul li a {
  font-size: 14px;
}

/* ==========================================================
   4. Pages
   ========================================================== */

/* ---------- 首页 ---------- */
.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px;
}

/* Hero 区 */
.hero {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: 32px;
  padding: 0;
  overflow: hidden;
}

.hero-inner {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 360px;
}

/* 左侧索引 */
.hero-index {
  background-color: var(--color-muted);
  padding: 32px 24px;
  border-right: 1px solid var(--color-border);
}

.hero-index-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--color-text);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

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

.hero-index-list li a {
  display: block;
  padding: 10px 14px;
  font-size: 15px;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast),
    color var(--transition-fast);
}

.hero-index-list li a:hover {
  background-color: var(--color-surface);
  color: var(--color-accent);
}

/* 右侧主内容 */
.hero-content {
  padding: 40px 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-content h1 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.3;
}

.hero-intro {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  max-width: 560px;
}

.hero-media {
  margin: 0;
}

.hero-media img {
  width: 100%;
  max-height: 240px;
  object-fit: cover;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

/* 工具分类索引 */
.tool-index {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin-bottom: 32px;
}

.tool-index h2 {
  font-size: 20px;
  margin-bottom: 16px;
}

.tool-index-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tool-index-tags a {
  display: inline-block;
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  background-color: var(--color-muted);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  transition: all var(--transition-fast);
}

.tool-index-tags a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background-color: var(--color-accent-light);
}

/* 工具列表 */
.tool-list {
  margin-bottom: 32px;
}

.tool-list h2 {
  font-size: 20px;
  margin-bottom: 20px;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

.tool-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.tool-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.tool-card-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--color-text);
}

.tool-card-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.tool-card a {
  font-size: 14px;
  font-weight: 500;
  display: inline-block;
}

.tool-card a::after {
  content: " →";
  transition: transform var(--transition-fast);
  display: inline-block;
}

.tool-card a:hover::after {
  transform: translateX(4px);
}

.tool-media-note {
  margin: 20px 0 0;
}

.tool-media-note img {
  width: 100%;
  max-height: 280px;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

/* 指南入口 */
.guide-entry {
  margin-bottom: 32px;
}

.guide-entry h2 {
  font-size: 20px;
  margin-bottom: 20px;
}

.guide-entry-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.guide-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.guide-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.guide-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.guide-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.guide-card a {
  font-size: 14px;
  font-weight: 500;
}

/* 反馈入口 */
.feedback-entry {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
}

.feedback-entry h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

.feedback-entry p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.feedback-entry p a {
  margin-right: 20px;
  font-weight: 500;
  display: inline-block;
  padding: 4px 0;
}

/* ---------- 关于页 ---------- */
.page-about .content-area {
  max-width: 100%;
}

/* ---------- 指南页 ---------- */
.page-guide .layout-shell {
  align-items: flex-start;
}

/* ---------- 转换工具页 ---------- */
.page-tool-converter .layout-shell {
  margin: 0;
  padding: 0;
}

.page-tool-converter .content-area {
  background: none;
  border: none;
  padding: 0;
}

/* ---------- 404 页 ---------- */
.error-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 64px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.error-panel {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px;
  max-width: 560px;
  width: 100%;
  margin-bottom: 32px;
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-panel h1 {
  font-size: 24px;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
  line-height: 1.6;
}

.error-home-btn {
  display: inline-block;
  padding: 10px 32px;
  background-color: var(--color-accent);
  color: #fff;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  transition: background-color var(--transition-fast);
}

.error-home-btn:hover {
  background-color: var(--color-accent-dark);
  color: #fff;
}

.error-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}

.error-links a {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding: 8px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  transition: all var(--transition-fast);
}

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

/* ==========================================================
   5. Responsive
   ========================================================== */
@media (max-width: 768px) {
  /* ---------- 页头 ---------- */
  .header-inner {
    height: 56px;
    padding: 0 16px;
  }

  .brand-slogan {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    padding: 12px 16px;
  }

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

  .nav-list li a {
    padding: 12px 16px;
    font-size: 16px;
  }

  /* ---------- 页脚 ---------- */
  .footer-inner {
    padding: 32px 16px 20px;
  }

  .footer-links {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  /* ---------- 布局外壳 ---------- */
  .layout-shell {
    flex-direction: column;
  }

  .layout-shell.sidebar-left {
    padding: 20px 16px;
  }

  .sidebar,
  .sidebar-nav,
  .page-aside {
    width: 100%;
    position: static;
    order: 0 !important;
  }

  .sidebar-left > .inner-main,
  .sidebar-left > .content-area,
  .sidebar-left > .page-content {
    width: 100%;
  }

  .content-area,
  .page-content {
    padding: 20px 16px;
  }

  .inner-main {
    padding: 20px 16px;
  }

  /* ---------- 首页 ---------- */
  .home-main {
    padding: 20px 16px;
  }

  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-index {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    padding: 20px;
  }

  .hero-index-list {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
  }

  .hero-index-list li {
    margin-bottom: 0;
  }

  .hero-index-list li a {
    padding: 8px 14px;
    font-size: 14px;
  }

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

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

  .tool-index {
    padding: 20px;
  }

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

  .tool-card {
    padding: 20px;
  }

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

  .guide-card {
    padding: 20px;
  }

  .feedback-entry {
    padding: 20px;
  }

  /* ---------- 内页 ---------- */
  .page-header {
    margin-bottom: 20px;
    padding-bottom: 16px;
  }

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

  .breadcrumb {
    font-size: 13px;
    margin-bottom: 16px;
  }

  .content-section h2 {
    font-size: 20px;
  }

  /* 表格横向滚动 */
  .guide-table,
  .data-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  /* ---------- 404 ---------- */
  .error-main {
    padding: 40px 16px;
  }

  .error-panel {
    padding: 32px 20px;
  }

  .error-code {
    font-size: 56px;
  }

  .error-links {
    gap: 12px;
  }
}

/* 平板中间断点 */
@media (min-width: 769px) and (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 240px 1fr;
  }

  .hero-content {
    padding: 32px;
  }

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

  .layout-shell {
    gap: 20px;
  }

  .sidebar,
  .sidebar-nav,
  .page-aside {
    width: 200px;
  }
}