/* ==================================================
   悠兔机场 样式表 (style.css)
   核心主题：多入口编排系统
   视觉规范：冷白商务科技风 · 细边框 · 开口长条入口
   ================================================== */

:root {
  --bg-main: #FAFBFA;
  --bg-white: #FFFFFF;
  --bg-second: #F2F5F3;
  --text-main: #1D2527;
  --text-body: #596367;
  --text-muted: #879093;
  --cyan: #456571;
  --cyan-deep: #36535D;
  --green-grey: #5D7569;
  --green-deep: #485D53;
  --sand-warm: #B1845D;
  --terracotta: #B56E50;
  --cyan-light: #EDF2F3;
  --green-light: #EEF3F0;
  --sand-light: #F6EFE7;
  --border: #DDE3E1;
  --border-focus: #C9D6D1;
  --shadow-subtle: 0 2px 8px rgba(29, 37, 39, 0.04);
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --max-content-width: 1200px;
  --header-height: 70px;
}

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

html {
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-main);
  font-size: 16px;
  line-height: 1.8;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--bg-main);
  color: var(--text-body);
}

/* 链接基础样式 */
a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* 按钮与交互重置 */
button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

/* 容器与布局 */
.container {
  width: 100%;
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section-wrap {
  padding: 72px 0;
  border-bottom: 1px solid var(--border);
}

.section-wrap:last-of-type {
  border-bottom: none;
}

/* 标题系统 */
h1, h2, h3, h4 {
  color: var(--text-main);
  font-weight: 600;
  line-height: 1.35;
}

h1 {
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 700;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(24px, 3vw, 32px);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

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

p {
  font-size: 16px;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 16px;
}

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

/* 模块标头 */
.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--cyan);
  background-color: var(--cyan-light);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}

.section-lead {
  font-size: 17px;
  color: var(--text-body);
  max-width: 820px;
  margin-bottom: 32px;
}

/* ==================================================
   Header 导航栏
   ================================================== */
.site-header {
  height: var(--header-height);
  background-color: var(--bg-white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-subtle);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo-svg {
  width: 38px;
  height: 38px;
  display: block;
}

.brand-text-group {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 19px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.brand-subtitle {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-top: 2px;
}

/* 桌面导航链接 */
.nav-desktop {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-main);
  padding: 8px 2px;
  position: relative;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: var(--cyan);
}

.nav-link.active {
  color: var(--cyan-deep);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--cyan-deep);
  border-radius: 1px;
}

/* 商业 CTA 按钮 */
.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 22px;
  background-color: var(--terracotta);
  color: #FFFFFF !important;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease, transform 0.15s ease;
  white-space: nowrap;
}

.cta-button:hover {
  background-color: #9F5D42;
  transform: translateY(-1px);
}

.cta-button-cyan {
  background-color: var(--cyan-deep);
}

.cta-button-cyan:hover {
  background-color: #2B424A;
}

.cta-button-outline {
  background-color: transparent;
  color: var(--cyan-deep) !important;
  border: 1px solid var(--cyan-deep);
}

.cta-button-outline:hover {
  background-color: var(--cyan-light);
  transform: translateY(-1px);
}

/* 移动端菜单开关 */
.menu-toggle {
  display: none;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 14px;
  font-weight: 500;
  background: var(--bg-white);
}

.mobile-drawer {
  display: none;
  background-color: var(--bg-white);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px 24px;
}

.mobile-drawer.is-open {
  display: block;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 18px;
}

.mobile-nav-list a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-main);
  padding: 8px 0;
  border-bottom: 1px dashed var(--border);
}

/* ==================================================
   多入口视觉语言：开口长条通道 (Entry Strip)
   ================================================== */
.entry-portal {
  position: relative;
  display: block;
  background-color: var(--bg-white);
  border: 1px solid var(--border);
  border-left: none; /* 左侧留出边框由伪元素绘制上下段 */
  border-radius: var(--radius-md);
  padding: 22px 28px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
  box-shadow: var(--shadow-subtle);
  margin-bottom: 16px;
}

/* 左侧开口边框：上下两段线，中间留出32px物理开口通道 */
.entry-portal::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: calc(50% - 16px);
  background-color: var(--cyan);
  transition: background-color 0.2s ease;
}

.entry-portal::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 2px;
  height: calc(50% - 16px);
  background-color: var(--cyan);
  transition: background-color 0.2s ease;
}

/* 开口门标指示点（中间开口处的微提示） */
.entry-portal-notch {
  position: absolute;
  left: -4px;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--sand-warm);
  opacity: 0.85;
}

.entry-portal:hover {
  border-color: var(--cyan);
  box-shadow: 0 4px 16px rgba(69, 101, 113, 0.08);
}

.entry-portal:hover::before,
.entry-portal:hover::after {
  background-color: var(--terracotta);
}

.entry-portal:hover .entry-action-arrow {
  transform: translateX(4px);
  color: var(--terracotta);
}

.entry-portal-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.entry-meta-group {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 6px;
}

.entry-number {
  font-size: 14px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.05em;
  font-variant-numeric: tabular-nums;
}

.entry-title {
  font-size: 19px;
  font-weight: 600;
  color: var(--text-main);
}

.entry-subinfo {
  font-size: 13px;
  color: var(--sand-warm);
  font-weight: 500;
}

.entry-desc {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
  max-width: 680px;
  margin-bottom: 0;
}

.entry-action {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 600;
  color: var(--cyan-deep);
  white-space: nowrap;
}

.entry-action-arrow {
  display: inline-block;
  transition: transform 0.2s ease, color 0.2s ease;
  font-size: 16px;
}

/* ==================================================
   Hero 多入口编排面
   ================================================== */
.hero-section {
  padding: 48px 0 64px;
  background: linear-gradient(180deg, #FFFFFF 0%, var(--bg-main) 100%);
  border-bottom: 1px solid var(--border);
}

.hero-header-box {
  max-width: 860px;
  margin-bottom: 36px;
}

.hero-badge-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--green-deep);
  background-color: var(--green-light);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
  letter-spacing: 0.03em;
}

.hero-main-slogan {
  font-size: clamp(26px, 3.5vw, 38px);
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 8px;
}

.hero-subtitle {
  font-size: 16px;
  font-weight: 500;
  color: var(--sand-warm);
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.hero-h1 {
  font-size: clamp(22px, 2.5vw, 28px);
  color: var(--cyan-deep);
  margin-bottom: 16px;
  font-weight: 600;
}

.hero-desc {
  font-size: 16px;
  color: var(--text-body);
  line-height: 1.8;
  max-width: 820px;
  margin-bottom: 24px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* 四大核心入口编排容器 (Desktop Width & Left offset) */
.hero-entries-plane {
  margin-top: 36px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.hero-entry-01 {
  width: 94%;
  margin-left: 0;
}

.hero-entry-02 {
  width: 82%;
  margin-left: 8%;
}

.hero-entry-03 {
  width: 100%;
  margin-left: 0;
}

.hero-entry-04 {
  width: 88%;
  margin-left: 12%;
}

/* ==================================================
   01 / 套餐入口
   ================================================== */
.demand-entry-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.verified-plan-card {
  background-color: var(--green-light);
  border: 1px solid var(--border-focus);
  border-left: 4px solid var(--green-grey);
  border-radius: var(--radius-md);
  padding: 28px;
  margin-top: 24px;
}

.verified-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--green-deep);
  background-color: #FFFFFF;
  border: 1px solid var(--border-focus);
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.verified-plan-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.verified-plan-name {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-main);
}

.verified-plan-price-group {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.verified-price {
  font-size: 34px;
  font-weight: 700;
  color: var(--terracotta);
  line-height: 1;
}

.verified-traffic {
  font-size: 18px;
  font-weight: 600;
  color: var(--cyan-deep);
}

.verified-plan-desc {
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: 20px;
}

/* ==================================================
   02 / 节点地区
   ================================================== */
.region-catalog {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.region-item {
  background-color: var(--bg-white);
  border: 1px solid var(--border);
  border-left: none;
  border-radius: var(--radius-md);
  padding: 18px 24px;
  position: relative;
  transition: border-color 0.2s ease;
}

.region-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: calc(50% - 14px);
  background-color: var(--cyan);
}

.region-item::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 2px;
  height: calc(50% - 14px);
  background-color: var(--cyan);
}

.region-item-inner {
  display: grid;
  grid-template-columns: 140px 1fr auto;
  align-items: center;
  gap: 20px;
}

.region-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.region-desc {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
}

/* ==================================================
   03 / 线路入口与知识表格
   ================================================== */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 24px 0;
  background-color: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.tech-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  text-align: left;
}

.tech-table th {
  background-color: var(--bg-second);
  color: var(--text-main);
  font-weight: 600;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.tech-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
  color: var(--text-body);
  vertical-align: top;
  line-height: 1.6;
}

.tech-table tr:last-child td {
  border-bottom: none;
}

.tech-table-type {
  font-weight: 600;
  color: var(--cyan-deep);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 6px;
}

.tech-table-type::before {
  content: "⊏";
  font-size: 13px;
  color: var(--sand-warm);
}

/* ==================================================
   04 / 多入口、负载均衡与动态倍率说明
   ================================================== */
.scale-explain-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 24px;
}

.scale-tick-track {
  background-color: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.scale-tick-labels {
  display: flex;
  justify-content: space-between;
  border-bottom: 2px dashed var(--border);
  padding-bottom: 16px;
  margin-bottom: 16px;
}

.scale-tick-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.scale-tick-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--cyan-deep);
}

.scale-tick-note {
  font-size: 12px;
  color: var(--text-muted);
}

/* ==================================================
   05 / AI工具
   ================================================== */
.platform-entry-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ==================================================
   07 / 客户端与设备组
   ================================================== */
.client-device-groups {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.client-group-card {
  background-color: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.client-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.client-group-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-main);
}

.client-tech-badge {
  font-size: 12px;
  color: var(--cyan);
  background-color: var(--cyan-light);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

/* ==================================================
   08 / 完整套餐 (商业转化区: 1主 + 4辅)
   ================================================== */
.pricing-orchestration-wrap {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 24px;
}

.pricing-aux-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.pricing-aux-card {
  background-color: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 14px;
}

.pricing-aux-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.pricing-aux-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-main);
}

.pricing-aux-tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--sand-warm);
  background-color: var(--sand-light);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.pricing-aux-desc {
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.6;
}

.pricing-aux-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--cyan-deep);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ==================================================
   10 / 使用教程与文章入口目录
   ================================================== */
.tutorials-catalog-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.tutorial-category-block {
  background-color: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px;
}

.tutorial-cat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.tutorial-cat-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--cyan-deep);
}

.tutorial-article-item {
  padding: 12px 0;
  border-bottom: 1px dashed var(--border);
  display: block;
}

.tutorial-article-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.tutorial-art-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
  transition: color 0.2s ease;
}

.tutorial-art-title:hover {
  color: var(--cyan);
}

.tutorial-art-snippet {
  font-size: 13px;
  color: var(--text-body);
  line-height: 1.5;
  margin-bottom: 6px;
}

.tutorial-art-meta {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  gap: 12px;
}

/* ==================================================
   11 / 网络排障四入口
   ================================================== */
.troubleshoot-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ==================================================
   12 / 常见问题 (FAQ 样式)
   ================================================== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background-color: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-summary {
  padding: 18px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  list-style: none; /* 去除原生三角符号 */
}

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

.faq-q-number {
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan);
  margin-right: 12px;
  font-variant-numeric: tabular-nums;
}

.faq-toggle-icon {
  font-size: 18px;
  color: var(--cyan);
  font-weight: 400;
  transition: transform 0.2s ease;
}

details[open] .faq-toggle-icon {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 24px 20px 24px;
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.8;
  border-top: 1px solid var(--bg-second);
  padding-top: 14px;
}

/* ==================================================
   文章详情页与单页布局 (轻商务技术阅读风)
   ================================================== */
.article-page-wrap {
  padding: 48px 0 80px;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

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

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

.breadcrumb-separator {
  color: var(--border);
}

.article-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.article-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 16px;
}

/* 快速结论框 (GEO / AI 摘要核心区) */
.quick-take-box {
  background-color: var(--green-light);
  border: 1px solid var(--border-focus);
  border-left: 4px solid var(--green-grey);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 28px 0 36px;
}

.quick-take-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--green-deep);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.quick-take-title::before {
  content: "⊏";
  color: var(--sand-warm);
}

.quick-take-content {
  font-size: 15px;
  color: var(--text-main);
  line-height: 1.75;
  margin-bottom: 0;
}

/* 文章主体双栏：正文 + 右侧目录 */
.article-layout-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 48px;
  align-items: start;
}

.article-main-body {
  max-width: 800px;
  font-size: 16px;
  color: var(--text-body);
  line-height: 1.85;
}

.article-main-body h2 {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--bg-second);
}

.article-main-body h3 {
  margin-top: 24px;
}

.article-main-body ul, 
.article-main-body ol {
  padding-left: 24px;
  margin-bottom: 20px;
}

.article-main-body li {
  margin-bottom: 8px;
}

/* 侧边目录 (Sticky TOC) */
.toc-sidebar {
  position: sticky;
  top: 90px;
  background-color: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px;
  max-width: 240px;
}

.toc-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 70vh;
  overflow-y: auto;
}

.toc-link {
  font-size: 13px;
  color: var(--text-body);
  line-height: 1.4;
  display: block;
}

.toc-link:hover {
  color: var(--cyan);
}

/* 文章底部相关阅读与闭环内链 */
.article-footer-links {
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}

.related-reads-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 14px;
}

.related-reads-item a {
  font-size: 15px;
  color: var(--cyan-deep);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
}

.related-reads-item a::before {
  content: "→";
  color: var(--sand-warm);
}

/* ==================================================
   Footer (浅灰绿色 紧凑商务)
   ================================================== */
.site-footer {
  background-color: #EEF2F0;
  color: #485458;
  border-top: 1px solid var(--border);
  padding: 48px 0 32px;
  margin-top: auto;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 36px;
}

.footer-brand-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.footer-brand-desc {
  font-size: 13px;
  color: #6C777A;
  line-height: 1.6;
  margin-bottom: 16px;
}

.footer-col-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  letter-spacing: 0.02em;
}

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

.footer-nav-links a {
  font-size: 13px;
  color: #485458;
}

.footer-nav-links a:hover {
  color: var(--cyan-deep);
}

.footer-bottom-bar {
  padding-top: 24px;
  border-top: 1px solid #D8E0DC;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 12px;
  color: #6C777A;
}

.friend-links-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
}

.friend-links-group a {
  color: #485458;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.friend-links-group a:hover {
  color: var(--cyan-deep);
}

/* ==================================================
   响应式断点适配 (375, 390, 430, 768, 1024, 1440)
   ================================================== */
@media (max-width: 1024px) {
  .hero-entry-01,
  .hero-entry-02,
  .hero-entry-03,
  .hero-entry-04 {
    width: 100%;
    margin-left: 0;
  }
  
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
  
  .article-layout-grid {
    grid-template-columns: 1fr;
  }
  
  .toc-sidebar {
    display: none; /* 移动端可折叠或隐藏 */
  }
}

@media (max-width: 768px) {
  .nav-desktop {
    display: none;
  }
  
  .menu-toggle {
    display: block;
  }
  
  .section-wrap {
    padding: 48px 0;
  }
  
  .region-item-inner {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  
  .client-device-groups,
  .pricing-aux-list,
  .tutorials-catalog-grid {
    grid-template-columns: 1fr;
  }
  
  .entry-portal {
    padding: 16px 20px;
  }
  
  .entry-portal-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  
  .footer-top-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

/* 极小屏幕 375px ~ 430px 精细排版 */
@media (max-width: 430px) {
  .container {
    padding: 0 16px;
  }
  
  .verified-price {
    font-size: 28px;
  }
  
  .verified-plan-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-cta-group .cta-button,
  .hero-cta-group .cta-button-outline {
    width: 100%;
    text-align: center;
  }
}

/* 动效适配：prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}