/* ==========================================================================
   吃瓜爆料网 - 整站样式表
   Base / Layout / Components / Pages / Responsive
   色彩体系：深蓝 #0B1F3A、亮橙 #F5A623、背景灰 #F6F7F9、卡片白 #FFFFFF、正文深灰 #2C3E50
   ========================================================================== */

/* ==========================================================================
   Base
   ========================================================================== */

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

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

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #2C3E50;
  background-color: #F6F7F9;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: #0B1F3A;
  line-height: 1.35;
  font-weight: 700;
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
  font-weight: 600;
}

p {
  margin-bottom: 12px;
}

a {
  color: #0B1F3A;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #F5A623;
}

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

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

figure {
  margin: 0;
}

figcaption {
  font-size: 14px;
  color: #7A8A9A;
  margin-top: 8px;
  text-align: center;
}

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

details summary {
  cursor: pointer;
  list-style: none;
}

details summary::-webkit-details-marker {
  display: none;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================================
   Layout — 全局骨架
   ========================================================================== */

.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-main {
  flex: 1 0 auto;
}

.site-header {
  background-color: #0B1F3A;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(11, 31, 58, 0.18);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: 1px;
}

.brand-name::first-letter {
  color: #F5A623;
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: 4px;
}

.main-nav .nav-link {
  display: block;
  padding: 8px 16px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 15px;
  font-weight: 500;
  border-radius: 4px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.main-nav .nav-link:hover {
  color: #FFFFFF;
  background-color: rgba(255, 255, 255, 0.08);
}

.main-nav .nav-link.is-current {
  color: #FFFFFF;
  background-color: rgba(245, 166, 35, 0.2);
  position: relative;
}

.main-nav .nav-link.is-current::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 16px;
  right: 16px;
  height: 2px;
  background-color: #F5A623;
  border-radius: 2px 2px 0 0;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  padding: 10px;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
}

.menu-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: #FFFFFF;
  border-radius: 2px;
}

.site-footer {
  background-color: #0B1F3A;
  color: rgba(255, 255, 255, 0.7);
  margin-top: auto;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px 24px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
  gap: 32px;
}

.footer-brand {
  display: block;
  font-size: 20px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 12px;
}

.footer-brand::first-letter {
  color: #F5A623;
}

.footer-about p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.7;
}

.footer-col h3 {
  font-size: 15px;
  font-weight: 600;
  color: #FFFFFF;
  margin-bottom: 14px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col ul a {
  color: rgba(255, 255, 255, 0.65);
  font-size: 14px;
  transition: color 0.2s ease;
}

.footer-col ul a:hover {
  color: #F5A623;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 16px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.45);
  margin: 0;
}

/* 移动端底部任务导航 — 仅首页 */
.mobile-bottom-nav {
  display: none;
}

/* ==========================================================================
   Components — 通用组件
   ========================================================================== */

/* 按钮 */
.btn-primary,
.btn-secondary,
.btn-link {
  display: inline-block;
  padding: 12px 28px;
  font-size: 16px;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  border: none;
}

.btn-primary {
  background-color: #F5A623;
  color: #0B1F3A;
  box-shadow: 0 2px 6px rgba(245, 166, 35, 0.35);
}

.btn-primary:hover {
  background-color: #E08E0F;
  color: #0B1F3A;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(245, 166, 35, 0.4);
}

.btn-secondary {
  background-color: transparent;
  color: #F5A623;
  border: 2px solid #F5A623;
}

.btn-secondary:hover {
  background-color: rgba(245, 166, 35, 0.1);
  color: #F5A623;
  transform: translateY(-2px);
}

.btn-link {
  padding: 8px 16px;
  color: #0B1F3A;
  font-weight: 500;
}

.btn-link:hover {
  color: #F5A623;
}

/* 文本链接 */
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 15px;
  font-weight: 600;
  color: #0B1F3A;
  transition: color 0.2s ease;
}

.text-link::after {
  content: "→";
  transition: transform 0.2s ease;
}

.text-link:hover {
  color: #F5A623;
}

.text-link:hover::after {
  transform: translateX(4px);
}

/* 面包屑 */
.breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 24px 0;
  font-size: 14px;
  color: #7A8A9A;
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb a {
  color: #7A8A9A;
  transition: color 0.2s ease;
}

.breadcrumb a:hover {
  color: #F5A623;
}

.breadcrumb-sep {
  color: #B0B8C0;
}

.breadcrumb-current {
  color: #2C3E50;
  font-weight: 500;
}

/* 页面标题区 */
.page-header {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px 20px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: #0B1F3A;
}

.page-description {
  margin-top: 12px;
  font-size: 16px;
  color: #2C3E50;
  max-width: 720px;
}

/* 相关链接 */
.related-links {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

.related-links-label {
  font-size: 15px;
  font-weight: 600;
  color: #2C3E50;
  margin-right: 16px;
}

.related-links-item {
  display: inline-block;
  margin: 4px 12px 4px 0;
  font-size: 15px;
  color: #0B1F3A;
}

.related-links-item:hover {
  color: #F5A623;
}

.related-links ul {
  list-style: none;
}

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

.related-links ul a {
  font-size: 15px;
  color: #0B1F3A;
}

.related-links ul a:hover {
  color: #F5A623;
}

/* FAQ 手风琴 */
.faq-item {
  background-color: #FFFFFF;
  border: 1px solid #E5E9ED;
  border-radius: 6px;
  margin-bottom: 12px;
  overflow: hidden;
  transition: box-shadow 0.2s ease;
}

.faq-item:hover {
  box-shadow: 0 2px 8px rgba(11, 31, 58, 0.06);
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 600;
  color: #0B1F3A;
  position: relative;
  padding-right: 44px;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  color: #F5A623;
  transition: transform 0.2s ease;
}

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

.faq-item .faq-content,
.faq-item > p {
  padding: 0 20px 16px;
  font-size: 15px;
  color: #2C3E50;
  line-height: 1.7;
}

/* ==========================================================================
   Layout — 内页侧栏布局
   注意：.sidebar-left 可能位于 body 或祖先节点，此处按真实 DOM 编写
   ========================================================================== */

/* 情形1：.page-layout.sidebar-left 是 body 直接子元素（scenarios/versions/support） */
body > .page-layout.sidebar-left {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 24px 0;
  align-items: start;
}

/* 情形2：.layout-shell.sidebar-left 在 main 内部（features） */
.layout-shell.sidebar-left {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 24px;
  align-items: start;
  gap: 0;
}

/* 情形3：.page-layout.sidebar-left 是 main 内部（guide） */
main > .page-layout.sidebar-left,
.inner-main > .page-layout.sidebar-left {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 24px;
  align-items: start;
  gap: 0;
}

/* 服务目录侧栏 */
.service-sidebar,
.service-dir {
  background-color: #FFFFFF;
  border-radius: 8px;
  border: 1px solid #E5E9ED;
  padding: 20px 0;
  position: sticky;
  top: 84px;
}

.sidebar-nav ul,
.dir-list {
  list-style: none;
}

.sidebar-nav ul li a,
.dir-list li a {
  display: block;
  padding: 10px 24px;
  font-size: 15px;
  color: #2C3E50;
  border-left: 3px solid transparent;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.sidebar-nav ul li a:hover,
.dir-list li a:hover {
  background-color: #F6F7F9;
  color: #0B1F3A;
  border-left-color: #F5A623;
}

.sidebar-nav ul li a.is-active,
.dir-list li a.is-active {
  background-color: rgba(245, 166, 35, 0.08);
  color: #0B1F3A;
  font-weight: 600;
  border-left-color: #F5A623;
}

/* 内容区 */
.content-area {
  min-width: 0;
  padding-left: 32px;
}

/* 非 content-area 的内页主内容（直接在 main 下） */
.page-layout.sidebar-left > main.inner-main,
.layout-shell.sidebar-left > .content-area {
  min-width: 0;
}

body > .page-layout.sidebar-left > main.inner-main {
  padding-left: 32px;
}

main > .page-layout.sidebar-left > .content-area {
  padding-left: 32px;
}

/* ==========================================================================
   Components — 首页专属模块
   ========================================================================== */

/* 品牌主视觉 */
.hero-intro {
  background-color: #0B1F3A;
  color: #FFFFFF;
  padding: 72px 24px 64px;
  position: relative;
  overflow: hidden;
}

.hero-intro::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -80px;
  width: 320px;
  height: 320px;
  background-color: rgba(245, 166, 35, 0.08);
  border-radius: 50%;
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-content h1 {
  font-size: 40px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 16px;
  line-height: 1.3;
}

.hero-slogan {
  font-size: 20px;
  font-weight: 600;
  color: #F5A623;
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 28px;
  max-width: 480px;
}

.hero-media {
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.hero-media img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

/* 核心能力摘要 */
.capabilities-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px;
}

.section-heading {
  margin-bottom: 36px;
}

.section-heading h2 {
  font-size: 28px;
  margin-bottom: 8px;
}

.section-heading p {
  font-size: 16px;
  color: #7A8A9A;
  max-width: 640px;
}

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

.capability-card {
  background-color: #FFFFFF;
  border-radius: 8px;
  padding: 32px 28px;
  border: 1px solid #E5E9ED;
  transition: box-shadow 0.3s ease, transform 0.3s ease;
  position: relative;
}

.capability-card:hover {
  box-shadow: 0 8px 24px rgba(11, 31, 58, 0.08);
  transform: translateY(-4px);
}

.capability-number {
  display: inline-block;
  font-size: 40px;
  font-weight: 700;
  color: #F5A623;
  line-height: 1;
  margin-bottom: 16px;
  opacity: 0.4;
}

.capability-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
}

.capability-card p {
  font-size: 15px;
  color: #7A8A9A;
  margin: 0;
  line-height: 1.7;
}

/* 使用场景预览 */
.scenarios-preview {
  background-color: #FFFFFF;
  border-top: 1px solid #E5E9ED;
  border-bottom: 1px solid #E5E9ED;
  padding: 64px 24px;
}

.scenarios-preview .section-heading {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.scenario-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.scenario-card {
  background-color: #F6F7F9;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid #E5E9ED;
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.scenario-card:hover {
  box-shadow: 0 8px 24px rgba(11, 31, 58, 0.1);
  transform: translateY(-4px);
}

.scenario-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.scenario-card h3 {
  padding: 20px 20px 8px;
  font-size: 18px;
}

.scenario-card p {
  padding: 0 20px;
  font-size: 15px;
  color: #7A8A9A;
  margin-bottom: 16px;
}

.scenario-card .text-link {
  margin: 0 20px 20px;
}

/* 版本概要 */
.versions-overview {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px;
}

.version-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.version-card {
  background-color: #FFFFFF;
  border: 1px solid #E5E9ED;
  border-radius: 8px;
  padding: 32px;
  transition: box-shadow 0.3s ease;
}

.version-card:hover {
  box-shadow: 0 8px 24px rgba(11, 31, 58, 0.08);
}

.version-card.version-accent {
  border-color: #F5A623;
  border-width: 2px;
  position: relative;
}

.version-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.version-card p {
  font-size: 15px;
  color: #7A8A9A;
  margin-bottom: 20px;
  line-height: 1.7;
}

/* 入门引导 */
.guide-entry {
  background-color: #0B1F3A;
  padding: 64px 24px;
}

.guide-entry {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  max-width: 1200px;
  margin: 0 auto;
  align-items: center;
}

.guide-copy h2 {
  font-size: 28px;
  color: #FFFFFF;
  margin-bottom: 16px;
}

.guide-copy p {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 24px;
  max-width: 480px;
}

.guide-media {
  border-radius: 8px;
  overflow: hidden;
}

.guide-media img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

/* 常见问题预览 */
.faq-preview {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px;
}

.faq-list {
  max-width: 800px;
  margin-bottom: 24px;
}

.faq-preview .faq-item > p {
  padding: 0 20px 16px;
}

/* ==========================================================================
   Pages — 功能概览 (features)
   ========================================================================== */

.page-heading p {
  font-size: 16px;
  color: #7A8A9A;
  max-width: 720px;
  line-height: 1.7;
}

.module-block {
  margin-bottom: 40px;
}

.module-block h2 {
  font-size: 22px;
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 2px solid #F5A623;
  display: inline-block;
}

.module-block > p {
  font-size: 15px;
  color: #7A8A9A;
  margin-bottom: 16px;
  max-width: 640px;
}

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

.feature-list li {
  background-color: #FFFFFF;
  border: 1px solid #E5E9ED;
  border-radius: 6px;
  padding: 20px;
  transition: box-shadow 0.2s ease;
}

.feature-list li:hover {
  box-shadow: 0 4px 12px rgba(11, 31, 58, 0.06);
}

.feature-list h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.feature-list p {
  font-size: 14px;
  color: #7A8A9A;
  margin: 0;
  line-height: 1.6;
}

.feature-media {
  margin: 32px 0;
  border-radius: 8px;
  overflow: hidden;
  background-color: #FFFFFF;
  border: 1px solid #E5E9ED;
}

.feature-media img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.feature-media figcaption {
  padding: 12px;
}

/* ==========================================================================
   Pages — 使用场景 (scenarios)
   ========================================================================== */

.scenario-block {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  margin-bottom: 48px;
  padding: 32px;
  background-color: #FFFFFF;
  border: 1px solid #E5E9ED;
  border-radius: 8px;
  align-items: start;
}

.scenario-text h2 {
  font-size: 22px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #F5A623;
  display: inline-block;
}

.scenario-label {
  font-size: 14px;
  font-weight: 600;
  color: #F5A623;
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.scenario-text p {
  font-size: 15px;
  color: #2C3E50;
  margin-bottom: 12px;
  line-height: 1.7;
}

.scenario-figure {
  border-radius: 6px;
  overflow: hidden;
  background-color: #F6F7F9;
}

.scenario-figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.scenario-figure figcaption {
  padding: 8px 12px;
  font-size: 13px;
}

/* ==========================================================================
   Pages — 版本说明 (versions)
   ========================================================================== */

.version-overview h2 {
  font-size: 22px;
  margin-bottom: 12px;
}

.version-overview > p {
  font-size: 15px;
  color: #7A8A9A;
  margin-bottom: 20px;
  max-width: 720px;
}

.version-figure {
  margin: 24px 0;
  border-radius: 8px;
  overflow: hidden;
}

.version-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.table-wrap {
  overflow-x: auto;
  background-color: #FFFFFF;
  border: 1px solid #E5E9ED;
  border-radius: 8px;
  margin: 24px 0;
}

.version-table {
  min-width: 560px;
}

.version-table thead th {
  background-color: #0B1F3A;
  color: #FFFFFF;
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 600;
  text-align: left;
}

.version-table tbody td {
  padding: 14px 20px;
  font-size: 14px;
  border-top: 1px solid #E5E9ED;
}

.version-table tbody tr:nth-child(even) {
  background-color: #F6F7F9;
}

.version-detail {
  background-color: #FFFFFF;
  border: 1px solid #E5E9ED;
  border-radius: 8px;
  padding: 28px;
  margin-bottom: 24px;
}

.version-detail h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

.version-detail p {
  font-size: 15px;
  color: #2C3E50;
  line-height: 1.7;
  margin-bottom: 10px;
}

.version-advice {
  margin: 32px 0;
}

.version-advice h2 {
  font-size: 22px;
  margin-bottom: 16px;
}

.advice-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.advice-card {
  background-color: #FFFFFF;
  border: 1px solid #E5E9ED;
  border-radius: 8px;
  padding: 28px;
  border-top: 3px solid #F5A623;
}

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

.advice-card p {
  font-size: 15px;
  color: #7A8A9A;
  line-height: 1.7;
  margin: 0;
}

.upgrade-path {
  background-color: #FFFFFF;
  border: 1px solid #E5E9ED;
  border-radius: 8px;
  padding: 28px;
  margin: 32px 0;
}

.upgrade-path h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

.upgrade-path p {
  font-size: 15px;
  color: #2C3E50;
  line-height: 1.7;
  margin-bottom: 10px;
}

/* ==========================================================================
   Pages — 操作指南 (guide)
   ========================================================================== */

.guide-section {
  margin-bottom: 40px;
}

.guide-section h2 {
  font-size: 22px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid #F5A623;
  display: inline-block;
}

.guide-section > p {
  font-size: 15px;
  color: #7A8A9A;
  margin-bottom: 16px;
}

.prep-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.prep-list li {
  background-color: #FFFFFF;
  border: 1px solid #E5E9ED;
  border-radius: 6px;
  padding: 16px 20px;
  font-size: 15px;
  position: relative;
  padding-left: 40px;
}

.prep-list li::before {
  content: "✓";
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: #F5A623;
  font-weight: 700;
}

/* 步骤条 */
.step-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 20px;
  margin-bottom: 24px;
  background-color: #FFFFFF;
  border: 1px solid #E5E9ED;
  border-radius: 8px;
  padding: 24px;
  transition: box-shadow 0.2s ease;
}

.step-item:hover {
  box-shadow: 0 4px 12px rgba(11, 31, 58, 0.06);
}

.step-number {
  width: 40px;
  height: 40px;
  background-color: #0B1F3A;
  color: #FFFFFF;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
}

.step-content h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.step-content p {
  font-size: 15px;
  color: #2C3E50;
  line-height: 1.7;
  margin-bottom: 8px;
}

.guide-figure {
  margin-top: 12px;
  border-radius: 6px;
  overflow: hidden;
  background-color: #F6F7F9;
}

.guide-figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 8px 12px;
  font-size: 13px;
}

/* 检查清单 */
.check-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.check-list li {
  background-color: #FFFFFF;
  border: 1px solid #E5E9ED;
  border-radius: 6px;
  padding: 16px 20px;
  font-size: 14px;
  color: #2C3E50;
  position: relative;
  padding-left: 36px;
}

.check-list li::before {
  content: "☐";
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: #F5A623;
  font-size: 16px;
}

/* ==========================================================================
   Pages — 技术支持 (support)
   ========================================================================== */

.support-intro {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 32px;
  margin-bottom: 40px;
  background-color: #FFFFFF;
  border: 1px solid #E5E9ED;
  border-radius: 8px;
  padding: 28px;
  align-items: center;
}

.support-figure {
  border-radius: 6px;
  overflow: hidden;
}

.support-figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.support-intro-text p {
  font-size: 15px;
  color: #2C3E50;
  line-height: 1.7;
  margin-bottom: 12px;
}

.faq-section {
  margin-bottom: 40px;
}

.faq-section h2,
.policy-section h2,
.feedback-section h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.section-desc {
  font-size: 15px;
  color: #7A8A9A;
  margin-bottom: 20px;
}

.faq-more {
  margin-top: 20px;
  padding: 16px 20px;
  background-color: #FFFFFF;
  border: 1px solid #E5E9ED;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.faq-more p {
  font-size: 15px;
  color: #2C3E50;
  margin: 0;
}

.policy-section {
  margin-bottom: 40px;
}

.policy-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.policy-item {
  background-color: #FFFFFF;
  border: 1px solid #E5E9ED;
  border-radius: 8px;
  padding: 24px;
  border-top: 3px solid #0B1F3A;
  transition: box-shadow 0.2s ease;
}

.policy-item:hover {
  box-shadow: 0 4px 12px rgba(11, 31, 58, 0.06);
}

.policy-item h3 {
  font-size: 16px;
  margin-bottom: 10px;
}

.policy-item p {
  font-size: 14px;
  color: #7A8A9A;
  line-height: 1.7;
  margin: 0;
}

.feedback-section {
  margin-bottom: 40px;
}

.feedback-list {
  list-style: none;
  margin: 20px 0;
}

.feedback-list li {
  background-color: #FFFFFF;
  border: 1px solid #E5E9ED;
  border-radius: 6px;
  padding: 16px 20px;
  margin-bottom: 12px;
  font-size: 15px;
  position: relative;
  padding-left: 44px;
}

.feedback-list li::before {
  content: "→";
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: #F5A623;
  font-weight: 700;
}

/* ==========================================================================
   Pages — 404
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px 24px;
}

.error-content {
  text-align: center;
  max-width: 520px;
}

.error-content h1 {
  font-size: 32px;
  margin-bottom: 12px;
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: #F5A623;
  line-height: 1;
  margin: 24px 0;
}

.error-desc {
  font-size: 16px;
  color: #7A8A9A;
  margin-bottom: 32px;
}

.btn.btn-primary {
  display: inline-block;
}

/* ==========================================================================
   Responsive — 断点适配
   ========================================================================== */

/* 平板及以下 */
@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: 1.4fr 1fr 1fr;
  }

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

  .capability-card:last-child,
  .scenario-card:last-child {
    grid-column: span 1;
  }

  .hero-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-media img {
    height: 260px;
  }

  .guide-entry {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

  .scenario-figure img {
    height: 220px;
  }

  .support-intro {
    grid-template-columns: 1fr;
  }

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

/* 移动端 768px */
@media (max-width: 768px) {
  .header-inner {
    height: 56px;
    padding: 0 16px;
  }

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

  .main-nav.site-nav {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background-color: #0B1F3A;
    padding: 12px 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  }

  .main-nav.site-nav.is-open {
    display: block;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 4px;
  }

  .main-nav .nav-link {
    padding: 12px 16px;
    font-size: 16px;
  }

  .main-nav .nav-link.is-current::after {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .mobile-menu-btn[aria-expanded="true"] .menu-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .mobile-menu-btn[aria-expanded="true"] .menu-bar:nth-child(2) {
    opacity: 0;
  }

  .mobile-menu-btn[aria-expanded="true"] .menu-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .menu-bar {
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

  /* 首页移动端底部导航 */
  .mobile-bottom-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: #0B1F3A;
    z-index: 90;
    padding: 4px 0;
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.15);
  }

  .bottom-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px 4px;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.6);
    min-height: 44px;
    justify-content: center;
  }

  .bottom-nav-item.active {
    color: #F5A623;
  }

  .bottom-nav-item::before {
    font-size: 18px;
    margin-bottom: 2px;
  }

  .bottom-nav-item:nth-child(1)::before {
    content: "⌂";
  }

  .bottom-nav-item:nth-child(2)::before {
    content: "▦";
  }

  .bottom-nav-item:nth-child(3)::before {
    content: "☷";
  }

  .bottom-nav-item:nth-child(4)::before {
    content: "✉";
  }

  /* 首页底部留白给移动导航 */
  body.site-home .site-footer {
    padding-bottom: 56px;
  }

  /* 内页侧栏布局 — 移动端隐藏侧栏 */
  body > .page-layout.sidebar-left,
  .layout-shell.sidebar-left,
  main > .page-layout.sidebar-left,
  .inner-main > .page-layout.sidebar-left {
    display: block;
    padding: 0 16px 24px;
  }

  .service-sidebar,
  .service-dir {
    display: none;
  }

  .content-area,
  body > .page-layout.sidebar-left > main.inner-main,
  main > .page-layout.sidebar-left > .content-area {
    padding-left: 0;
  }

  /* 面包屑与页头 */
  .breadcrumb {
    padding: 16px 16px 0;
    font-size: 13px;
  }

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

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

  /* 首页模块 */
  .hero-intro {
    padding: 48px 16px 40px;
  }

  .hero-content h1 {
    font-size: 28px;
  }

  .hero-slogan {
    font-size: 17px;
  }

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

  .hero-media img {
    height: 200px;
  }

  .capabilities-section,
  .versions-overview,
  .faq-preview {
    padding: 48px 16px;
  }

  .scenarios-preview {
    padding: 48px 16px;
  }

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

  .version-compare {
    grid-template-columns: 1fr;
  }

  .guide-entry {
    padding: 48px 16px;
  }

  .guide-media img {
    height: 180px;
  }

  .section-heading h2 {
    font-size: 22px;
  }

  /* 功能列表 */
  .feature-list {
    grid-template-columns: 1fr;
  }

  .feature-media img {
    height: 200px;
  }

  /* 版本页 */
  .version-table {
    min-width: 480px;
  }

  .advice-grid {
    grid-template-columns: 1fr;
  }

  .version-figure img {
    height: 180px;
  }

  /* 指南页 */
  .prep-list {
    grid-template-columns: 1fr;
  }

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

  .step-item {
    grid-template-columns: 40px 1fr;
    gap: 16px;
    padding: 16px;
  }

  .step-number {
    width: 36px;
    height: 36px;
    font-size: 16px;
  }

  .guide-figure img {
    height: 160px;
  }

  /* 场景页 */
  .scenario-block {
    padding: 20px;
    margin-bottom: 32px;
  }

  .scenario-figure img {
    height: 180px;
  }

  /* 支持页 */
  .support-intro {
    padding: 20px;
    grid-template-columns: 1fr;
  }

  .support-figure img {
    height: 160px;
  }

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

  .faq-more {
    flex-direction: column;
    align-items: flex-start;
  }

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

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

  .footer-bottom {
    padding: 12px 16px;
  }

  .footer-bottom p {
    font-size: 12px;
  }

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

  .related-links-label {
    display: block;
    margin-bottom: 8px;
  }

  .related-links-item {
    display: inline-block;
    margin: 4px 8px 4px 0;
    font-size: 14px;
  }

  /* FAQ */
  .faq-item summary {
    padding: 14px 16px;
    padding-right: 40px;
    font-size: 15px;
  }

  .faq-item .faq-content,
  .faq-item > p {
    padding: 0 16px 14px;
    font-size: 14px;
  }
}

/* 小屏手机 390px */
@media (max-width: 480px) {
  .brand-name {
    font-size: 17px;
  }

  .hero-content h1 {
    font-size: 24px;
  }

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

  .btn-primary,
  .btn-secondary {
    padding: 10px 20px;
    font-size: 15px;
  }

  .capability-card {
    padding: 24px 20px;
  }

  .version-card {
    padding: 24px 20px;
  }

  .scenario-card img {
    height: 160px;
  }

  .hero-media img {
    height: 180px;
  }

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

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

  .step-item {
    grid-template-columns: 1fr;
  }

  .step-number {
    margin-bottom: 8px;
  }

  .scenario-block {
    padding: 16px;
  }

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

  .breadcrumb {
    padding: 12px 16px 0;
  }
}