/* ==========================================================================
   赔钱机场 · 第二套独立官网：透明价签系统
   ========================================================================== */

:root {
  /* 调色盘规范 */
  --bg-main: #FBF8F1;
  --bg-white: #FFFFFF;
  --bg-second: #F4F0E8;
  --bg-footer: #EFEAE1;
  
  --text-main: #202824;
  --text-body: #56615C;
  --text-muted: #878E89;
  
  --color-green: #40695C;
  --color-darkgreen: #315248;
  --color-bluegray: #567485;
  --color-orange: #B87447;
  
  --color-lightgreen: #EEF2ED;
  --color-lightblue: #EEF2F4;
  --color-lightorange: #F6EDE6;
  
  --border-color: #E5DED2;
  --border-dark: #C9C0B3;
  
  /* 字体系统 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  /* 阴影与过渡 (克制商务) */
  --shadow-sm: 0 1px 3px rgba(32, 40, 36, 0.04);
  --shadow-md: 0 4px 12px rgba(32, 40, 36, 0.06);
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  
  /* 折角切角标准 */
  --tag-corner-size: 10px;
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-body);
  line-height: 1.8;
  font-size: 1.0625rem; /* 17px */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* 链接与文字 */
a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

img, svg {
  display: block;
  max-width: 100%;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 700;
  line-height: 1.3;
}

p {
  margin-bottom: 1.25rem;
}

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

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}

li {
  margin-bottom: 0.5rem;
}

/* 通用容器 */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.container-narrow {
  width: 100%;
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* 章节通用样式 */
.section {
  padding-top: 5rem;
  padding-bottom: 5rem;
  border-bottom: 1px solid var(--border-color);
}

.section-head {
  margin-bottom: 2.75rem;
}

.section-index {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-green);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.25rem); /* 28px - 36px */
  color: var(--text-main);
  margin-bottom: 0.875rem;
}

.section-lead {
  font-size: 1.0625rem;
  color: var(--text-body);
  max-width: 780px;
  line-height: 1.8;
}

/* 折角徽标与标签通用 */
.tag-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: 2px;
  white-space: nowrap;
}

.tag-badge.green {
  background-color: var(--color-lightgreen);
  color: var(--color-darkgreen);
  border: 1px solid rgba(64, 105, 92, 0.2);
}

.tag-badge.orange {
  background-color: var(--color-lightorange);
  color: var(--color-orange);
  border: 1px solid rgba(184, 116, 71, 0.25);
}

.tag-badge.blue {
  background-color: var(--color-lightblue);
  color: var(--color-bluegray);
  border: 1px solid rgba(86, 116, 133, 0.25);
}

.tag-badge.muted {
  background-color: var(--bg-second);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

/* 折角边框卡片/条状元素 (透明价签感) */
.tag-cut-corner {
  position: relative;
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  clip-path: polygon(0 0, calc(100% - var(--tag-corner-size)) 0, 100% var(--tag-corner-size), 100% 100%, 0 100%);
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.tag-cut-corner::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: var(--tag-corner-size);
  height: var(--tag-corner-size);
  background-color: var(--bg-second);
  border-left: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  pointer-events: none;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 0.65rem 1.35rem;
  border-radius: 3px;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-darkgreen);
  color: #FFFFFF;
  border: 1px solid var(--color-darkgreen);
}

.btn-primary:hover {
  background-color: #27433a;
  border-color: #27433a;
  color: #FFFFFF;
}

.btn-primary .arrow {
  transition: transform var(--transition-fast);
}

.btn-primary:hover .arrow {
  transform: translateX(3px);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-darkgreen);
  border: 1px solid var(--border-dark);
}

.btn-outline:hover {
  background-color: var(--bg-second);
  border-color: var(--color-green);
  color: var(--color-darkgreen);
}

.btn-orange {
  background-color: var(--color-orange);
  color: #FFFFFF;
  border: 1px solid var(--color-orange);
}

.btn-orange:hover {
  background-color: #a4643b;
  color: #FFFFFF;
}

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.84375rem;
}

/* ==========================================================================
   Header 导航
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 70px;
  background-color: var(--bg-white);
  border-bottom: 1px solid var(--border-color);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

/* 品牌 Logo */
.brand-logo-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
}

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

.brand-name {
  font-size: 1.1875rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.brand-sub {
  font-size: 0.6875rem;
  color: var(--text-muted);
  line-height: 1.2;
  margin-top: 2px;
}

/* 桌面导航 */
.desktop-nav {
  display: flex;
  align-items: center;
  gap: 1.35rem;
}

.nav-link {
  position: relative;
  font-size: 0.9375rem;
  color: var(--text-body);
  font-weight: 500;
  padding: 0.5rem 0;
}

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

.nav-link.active {
  color: var(--color-darkgreen);
  font-weight: 600;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-green);
}

.header-cta {
  flex-shrink: 0;
}

/* 移动端菜单按钮与抽屉 */
.mobile-menu-btn {
  display: none;
  padding: 0.5rem 0.75rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-darkgreen);
  border: 1px solid var(--border-color);
  background-color: var(--bg-main);
  border-radius: 3px;
}

.mobile-menu-drawer {
  display: none;
  position: fixed;
  top: 70px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-main);
  padding: 1.5rem;
  border-top: 1px solid var(--border-color);
  z-index: 99;
  overflow-y: auto;
}

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

.mobile-nav-list {
  list-style: none;
  padding: 0;
  margin-bottom: 2rem;
}

.mobile-nav-list li {
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 0;
}

.mobile-nav-list a {
  display: block;
  padding: 0.9rem 0;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-main);
}

.mobile-nav-list a:hover {
  color: var(--color-green);
}

/* ==========================================================================
   Hero 价格标签墙
   ========================================================================== */
.hero-section {
  position: relative;
  background-color: var(--bg-main);
  padding-top: 3.5rem;
  padding-bottom: 4rem;
  border-bottom: 1px solid var(--border-color);
}

.hero-meta-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: var(--bg-second);
  border: 1px solid var(--border-color);
  padding: 0.3rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-darkgreen);
  margin-bottom: 1.25rem;
}

.hero-main-title {
  font-size: clamp(2.35rem, 5vw, 3.25rem); /* 44px - 58px */
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-bluegray);
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.hero-seo-h1 {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-green);
  margin-bottom: 1rem;
}

.hero-description {
  font-size: 1.0625rem;
  color: var(--text-body);
  max-width: 820px;
  line-height: 1.85;
  margin-bottom: 1.75rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2.75rem;
}

/* 5条价格标签墙 (错位编辑感) */
.price-tags-wall {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  width: 100%;
}

.price-strip-tag {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 0.95rem 1.4rem;
  text-decoration: none;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  border-radius: 2px;
}

.price-strip-tag:hover {
  transform: translateY(-2px);
  border-color: var(--color-green);
  box-shadow: var(--shadow-sm);
}

/* 桌面端错位与长度层次 */
@media (min-width: 992px) {
  .strip-stagger-1 {
    width: 94%;
    margin-right: auto; /* 略偏左 */
  }
  .strip-stagger-2 {
    width: 96%;
    margin-left: auto; /* 略偏右 */
  }
  .strip-stagger-3 {
    width: 100%; /* 最长居中 */
  }
  .strip-stagger-4 {
    width: 96%;
    margin-left: auto; /* 略偏右 */
  }
  .strip-stagger-5 {
    width: 93%;
    margin-right: auto; /* 略偏左 */
  }
}

/* 主力价签高亮 */
.price-strip-tag.highlight {
  background-color: var(--color-lightgreen);
  border: 1px solid var(--color-green);
  border-left: 5px solid var(--color-darkgreen);
}

.price-strip-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.strip-type-name {
  font-weight: 700;
  font-size: 1.0625rem;
  color: var(--text-main);
  min-width: 90px;
}

.strip-traffic {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-bluegray);
  background-color: var(--bg-second);
  padding: 0.2rem 0.55rem;
  border-radius: 2px;
}

.price-strip-tag.highlight .strip-traffic {
  background-color: #FFFFFF;
}

.price-strip-center {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

.strip-price-num {
  font-size: 1.625rem; /* 26px */
  font-weight: 800;
  color: var(--text-main);
  font-family: var(--font-mono);
}

.price-strip-tag.highlight .strip-price-num {
  color: var(--color-darkgreen);
  font-size: 1.75rem;
}

.strip-price-unit {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.price-strip-right {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.strip-use-case {
  font-size: 0.875rem;
  color: var(--text-body);
}

.strip-action-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-darkgreen);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.strip-action-link:hover {
  color: var(--color-orange);
}

/* ==========================================================================
   01 / 按价格找方案
   ========================================================================== */
.price-index-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.price-index-item {
  display: grid;
  grid-template-columns: 100px 180px 1fr 140px;
  align-items: center;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 1.1rem 1.5rem;
  border-radius: 2px;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.price-index-item:hover {
  transform: translateY(-2px);
  border-color: var(--color-green);
}

.price-index-id {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-green);
  letter-spacing: 0.05em;
}

.price-index-tier {
  font-size: 1.1875rem;
  font-weight: 800;
  color: var(--text-main);
}

.price-index-fit {
  font-size: 0.9375rem;
  color: var(--text-body);
}

.price-index-action {
  text-align: right;
}

/* ==========================================================================
   02 / 按流量找方案
   ========================================================================== */
.traffic-tag-rows {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.traffic-row-item {
  display: grid;
  grid-template-columns: 160px 180px 1fr 140px;
  align-items: center;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 1.15rem 1.5rem;
  border-radius: 2px;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.traffic-row-item:hover {
  transform: translateY(-2px);
  border-color: var(--color-green);
}

.traffic-row-amount {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  font-family: var(--font-mono);
}

.traffic-row-tag {
  font-size: 0.875rem;
  color: var(--color-bluegray);
  font-weight: 600;
}

.traffic-row-desc {
  font-size: 0.9375rem;
  color: var(--text-body);
}

.traffic-row-action {
  text-align: right;
}

/* ==========================================================================
   03 / 按用途找方案
   ========================================================================== */
.usage-tag-index {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.usage-index-row {
  display: grid;
  grid-template-columns: 100px 170px 1fr 140px;
  align-items: center;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 1.15rem 1.5rem;
  border-radius: 2px;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.usage-index-row:hover {
  transform: translateY(-2px);
  border-color: var(--color-green);
}

.usage-row-code {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-green);
}

.usage-row-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-main);
}

.usage-row-focus {
  font-size: 0.9375rem;
  color: var(--text-body);
}

.usage-row-action {
  text-align: right;
}

/* ==========================================================================
   04 / 地区节点
   ========================================================================== */
.node-index-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.node-index-strip {
  display: grid;
  grid-template-columns: 160px 1fr 1.2fr 150px;
  align-items: center;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 1.2rem 1.5rem;
  border-radius: 2px;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.node-index-strip:hover {
  transform: translateY(-2px);
  border-color: var(--color-green);
}

.node-strip-region {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.node-region-name {
  font-size: 1.1875rem;
  font-weight: 800;
  color: var(--text-main);
}

.node-strip-purpose {
  font-size: 0.9375rem;
  color: var(--text-body);
}

.node-strip-factors {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.node-strip-link {
  text-align: right;
}

/* ==========================================================================
   05 / AI与流媒体 (左右双栏信息目录)
   ========================================================================== */
.dual-directory-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.directory-column {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 1.75rem;
  border-radius: 2px;
}

.column-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
  margin-bottom: 1.25rem;
}

.column-header h3 {
  font-size: 1.25rem;
}

.service-item-row {
  display: grid;
  grid-template-columns: 140px 110px 1fr 85px;
  align-items: center;
  padding: 0.8rem 0;
  border-bottom: 1px dashed var(--border-color);
  font-size: 0.875rem;
}

.service-item-row:last-child {
  border-bottom: none;
}

.service-name {
  font-weight: 700;
  color: var(--text-main);
}

.service-region {
  color: var(--color-bluegray);
}

.service-focus {
  color: var(--text-body);
}

.service-link {
  text-align: right;
  color: var(--color-darkgreen);
  font-weight: 600;
}

.service-link:hover {
  color: var(--color-orange);
}

/* ==========================================================================
   06 / 线路知识 (线路信息标签表)
   ========================================================================== */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  background-color: var(--bg-white);
}

.line-info-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.line-info-table th {
  background-color: var(--bg-second);
  color: var(--text-main);
  font-weight: 700;
  font-size: 0.875rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.line-info-table td {
  padding: 1.15rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.9375rem;
  vertical-align: middle;
}

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

.line-info-table tr:hover td {
  background-color: #FAF8F4;
}

.line-type-badge {
  display: inline-block;
  font-weight: 800;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--color-darkgreen);
  background-color: var(--color-lightgreen);
  padding: 0.25rem 0.65rem;
  border: 1px solid rgba(64, 105, 92, 0.25);
  border-radius: 2px;
}

/* ==========================================================================
   07 / 客户端 (设备标签目录)
   ========================================================================== */
.device-index-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.device-index-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 1.25rem 1.5rem;
  border-radius: 2px;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.device-index-strip:hover {
  transform: translateY(-2px);
  border-color: var(--color-green);
}

.device-strip-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.device-name {
  font-size: 1.1875rem;
  font-weight: 800;
  color: var(--text-main);
}

.device-type-badge {
  font-size: 0.8125rem;
  color: var(--text-muted);
  background-color: var(--bg-second);
  padding: 0.2rem 0.5rem;
  border-radius: 2px;
}

.device-strip-action {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-darkgreen);
}

.device-strip-action:hover {
  color: var(--color-orange);
}

/* ==========================================================================
   08 / 完整价目 (核心商业区域 · 价签目录)
   ========================================================================== */
.plan-catalog-wrap {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.plan-catalog-row {
  display: grid;
  grid-template-columns: 80px 180px 130px 160px 1fr 150px;
  align-items: center;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 1.25rem 1.5rem;
  border-radius: 2px;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.plan-catalog-row:hover {
  transform: translateY(-2px);
  border-color: var(--color-green);
  box-shadow: var(--shadow-sm);
}

/* 主力价签唯一高亮 */
.plan-catalog-row.featured {
  background-color: var(--color-lightgreen);
  border: 1px solid var(--color-green);
  border-left: 6px solid var(--color-darkgreen);
}

.plan-code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-green);
}

.plan-name-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.plan-title {
  font-size: 1.1875rem;
  font-weight: 800;
  color: var(--text-main);
}

.plan-traffic-vol {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.0625rem;
  color: var(--color-bluegray);
}

.plan-price-block {
  display: flex;
  align-items: baseline;
  gap: 0.2rem;
}

.plan-price-num {
  font-family: var(--font-mono);
  font-size: 1.75rem; /* 28px */
  font-weight: 800;
  color: var(--text-main);
}

.plan-catalog-row.featured .plan-price-num {
  color: var(--color-darkgreen);
  font-size: 1.95rem;
}

.plan-price-period {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.plan-scenarios {
  font-size: 0.9375rem;
  color: var(--text-body);
}

.plan-action-col {
  text-align: right;
}

/* 快速选择映射指示条 */
.quick-match-panel {
  margin-top: 2rem;
  background-color: var(--bg-second);
  border: 1px solid var(--border-color);
  padding: 1.25rem 1.5rem;
  border-radius: 2px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.match-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
}

.match-arrow {
  color: var(--color-orange);
  font-weight: 700;
}

/* ==========================================================================
   09 / 赔钱机场深度评测 (卡片式提要引流)
   ========================================================================== */
.review-highlight-card {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 2.25rem;
  border-radius: 2px;
}

.review-grid-meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin: 1.75rem 0;
  padding: 1.25rem;
  background-color: var(--bg-second);
  border-radius: 2px;
}

.meta-box-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.meta-box-val {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
}

/* ==========================================================================
   10 / 内容指南 (内容标签目录)
   ========================================================================== */
.content-directory-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.content-row-item {
  display: grid;
  grid-template-columns: 140px 1fr 180px;
  align-items: center;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 1.25rem 1.5rem;
  border-radius: 2px;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.content-row-item:hover {
  transform: translateY(-2px);
  border-color: var(--color-green);
}

.content-category-tag {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-darkgreen);
  background-color: var(--color-lightgreen);
  padding: 0.25rem 0.65rem;
  border-radius: 2px;
  display: inline-block;
  width: fit-content;
}

.content-title-abstract {
  padding-right: 1.5rem;
}

.content-item-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.content-item-abstract {
  font-size: 0.875rem;
  color: var(--text-body);
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.content-item-meta {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 1rem;
  font-size: 0.875rem;
}

.content-read-time {
  color: var(--text-muted);
  font-size: 0.8125rem;
}

.content-read-link {
  color: var(--color-darkgreen);
  font-weight: 600;
  white-space: nowrap;
}

.content-read-link:hover {
  color: var(--color-orange);
}

/* ==========================================================================
   11 / 网络排障 (故障标签目录)
   ========================================================================== */
.trouble-index-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.trouble-strip-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 1.25rem;
  border-radius: 2px;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.trouble-strip-item:hover {
  transform: translateY(-2px);
  border-color: var(--color-green);
}

.trouble-num {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-green);
  background-color: var(--bg-second);
  padding: 0.2rem 0.5rem;
  border-radius: 2px;
  flex-shrink: 0;
}

.trouble-body {
  flex-grow: 1;
}

.trouble-name {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.trouble-desc {
  font-size: 0.875rem;
  color: var(--text-body);
  line-height: 1.6;
}

/* ==========================================================================
   12 / 常见问题 (问答标签 · 折叠面板)
   ========================================================================== */
.faq-accordion-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-accordion-item {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  overflow: hidden;
}

.faq-accordion-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 1.5rem;
  text-align: left;
  background-color: var(--bg-white);
  border: none;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.faq-accordion-header:hover {
  background-color: #FAF8F4;
}

.faq-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.faq-q-badge {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-green);
  background-color: var(--color-lightgreen);
  padding: 0.15rem 0.45rem;
  border-radius: 2px;
}

.faq-icon-arrow {
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.faq-accordion-item.open .faq-icon-arrow {
  transform: rotate(180deg);
}

.faq-accordion-body {
  display: none;
  padding: 0 1.5rem 1.25rem 1.5rem;
  font-size: 0.9375rem;
  color: var(--text-body);
  line-height: 1.8;
  border-top: 1px dashed var(--border-color);
  padding-top: 1rem;
}

.faq-accordion-item.open .faq-accordion-body {
  display: block;
}

/* ==========================================================================
   Footer 页脚 (严格规范)
   ========================================================================== */
.site-footer {
  background-color: var(--bg-footer);
  color: var(--text-body);
  border-top: 1px solid var(--border-color);
  padding-top: 3.5rem;
  padding-bottom: 2rem;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2.75rem;
}

.footer-brand-col {
  padding-right: 1.5rem;
}

.footer-brand-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.footer-brand-sub {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.footer-col-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.footer-nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-nav-list li {
  margin-bottom: 0.6rem;
}

.footer-nav-list a {
  font-size: 0.875rem;
  color: var(--text-body);
}

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

/* 最底部严格固定区域 */
.footer-bottom-bar {
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.875rem;
}

.footer-copyright {
  color: var(--text-muted);
}

.footer-friendly-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.friendly-links-label {
  color: var(--text-muted);
  font-weight: 600;
}

.friendly-link-item {
  color: var(--color-darkgreen);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.friendly-link-item:hover {
  color: var(--color-orange);
}

/* ==========================================================================
   文章与内页排版 (Article & Content Layout)
   ========================================================================== */
.article-header {
  padding-top: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-main);
}

.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.breadcrumbs a {
  color: var(--color-darkgreen);
}

.breadcrumbs a:hover {
  text-decoration: underline;
}

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

.article-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.25;
  margin-bottom: 1rem;
}

.article-abstract {
  font-size: 1.125rem;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  padding-top: 1rem;
  border-top: 1px dashed var(--border-color);
}

/* 文章主体容器 */
.article-body-wrapper {
  background-color: var(--bg-white);
  padding-top: 3.5rem;
  padding-bottom: 4.5rem;
  border-bottom: 1px solid var(--border-color);
}

.article-content {
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--text-body);
}

/* GEO 快速结论面板 */
.geo-conclusion-box {
  background-color: var(--color-lightgreen);
  border: 1px solid var(--color-green);
  border-left: 5px solid var(--color-darkgreen);
  padding: 1.25rem 1.5rem;
  border-radius: 2px;
  margin-bottom: 2.25rem;
}

.geo-box-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-darkgreen);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* 本文目录 */
.toc-box {
  background-color: var(--bg-second);
  border: 1px solid var(--border-color);
  padding: 1.25rem 1.5rem;
  border-radius: 2px;
  margin-bottom: 2.5rem;
}

.toc-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.75rem;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc-list li {
  margin-bottom: 0.4rem;
}

.toc-list a {
  font-size: 0.9375rem;
  color: var(--color-darkgreen);
}

.toc-list a:hover {
  text-decoration: underline;
}

/* 文章内排版 */
.article-content h2 {
  font-size: 1.625rem;
  margin-top: 2.75rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.article-content h3 {
  font-size: 1.25rem;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.article-content blockquote {
  border-left: 4px solid var(--color-green);
  background-color: var(--bg-main);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  color: var(--text-main);
  font-style: italic;
}

.article-content code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: var(--bg-second);
  padding: 0.15rem 0.35rem;
  border-radius: 2px;
  border: 1px solid var(--border-color);
}

.article-content pre {
  background-color: #202824;
  color: #FBF8F1;
  padding: 1.25rem;
  border-radius: 3px;
  overflow-x: auto;
  margin: 1.5rem 0;
}

.article-content pre code {
  background: none;
  border: none;
  color: inherit;
  padding: 0;
}

/* 文章底部导航与相关阅读 */
.article-footer-nav {
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.prev-next-links {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

.prev-link, .next-link {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-darkgreen);
}

.prev-link:hover, .next-link:hover {
  color: var(--color-orange);
}

.related-reading-box {
  background-color: var(--bg-second);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  border-radius: 2px;
}

.related-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.related-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.related-list li {
  margin-bottom: 0.6rem;
}

.related-list a {
  font-size: 0.9375rem;
  color: var(--color-darkgreen);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ==========================================================================
   分类页样式 (Category Pages)
   ========================================================================== */
.category-header {
  padding-top: 3.5rem;
  padding-bottom: 2.5rem;
  background-color: var(--bg-main);
  border-bottom: 1px solid var(--border-color);
}

.category-title {
  font-size: clamp(2rem, 4vw, 2.5rem);
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.85rem;
}

.category-intro {
  font-size: 1.0625rem;
  color: var(--text-body);
  max-width: 820px;
  line-height: 1.8;
}

/* ==========================================================================
   响应式断点适配 (375, 390, 430, 768, 1024, 1440)
   ========================================================================== */
@media (max-width: 1024px) {
  .desktop-nav {
    display: none;
  }
  
  .mobile-menu-btn {
    display: inline-flex;
  }
  
  .dual-directory-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .plan-catalog-row {
    grid-template-columns: 60px 150px 110px 140px 1fr 130px;
  }
}

@media (max-width: 768px) {
  .section {
    padding-top: 3.5rem;
    padding-bottom: 3.5rem;
  }
  
  /* Hero 价签单列垂直展示，保证不需左右滑动 */
  .price-strip-tag {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1.1rem;
  }
  
  .price-strip-left, .price-strip-right, .price-strip-center {
    width: 100%;
    justify-content: space-between;
  }
  
  /* 按价格找方案移动端 */
  .price-index-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  
  .price-index-action {
    text-align: left;
    margin-top: 0.25rem;
  }
  
  /* 按流量找方案移动端 */
  .traffic-row-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  
  .traffic-row-action {
    text-align: left;
    margin-top: 0.25rem;
  }
  
  /* 按用途找方案移动端 */
  .usage-index-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  
  .usage-row-action {
    text-align: left;
    margin-top: 0.25rem;
  }
  
  /* 地区节点移动端 */
  .node-index-strip {
    grid-template-columns: 1fr;
    gap: 0.65rem;
  }
  
  .node-strip-link {
    text-align: left;
  }
  
  /* 设备与排障移动端 */
  .device-index-grid,
  .trouble-index-grid {
    grid-template-columns: 1fr;
  }
  
  /* 完整价目移动端响应为卡片式信息行 */
  .plan-catalog-row {
    grid-template-columns: 1fr;
    gap: 0.75rem;
    padding: 1.25rem;
  }
  
  .plan-action-col {
    text-align: left;
    margin-top: 0.5rem;
  }
  
  /* 内容指南文章行移动端 */
  .content-row-item {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
  
  .content-item-meta {
    justify-content: space-between;
  }
  
  .footer-top-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .footer-bottom-bar {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .review-grid-meta {
    grid-template-columns: 1fr 1fr;
  }
  
  .service-item-row {
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
  }
  
  .service-link {
    grid-column: span 2;
    text-align: left;
  }
}

/* 针对小屏手机 (375px, 390px, 430px) 的精细微调 */
@media (max-width: 480px) {
  .hero-main-title {
    font-size: 2rem;
  }
  
  .strip-price-num, .plan-price-num {
    font-size: 1.5rem;
  }
  
  .review-grid-meta {
    grid-template-columns: 1fr;
  }
  
  .btn {
    width: 100%;
  }
}

/* ==========================================================================
   可访问性与减弱动效 (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;
  }
  
  .price-strip-tag:hover,
  .price-index-item:hover,
  .traffic-row-item:hover,
  .usage-index-row:hover,
  .node-index-strip:hover,
  .device-index-strip:hover,
  .plan-catalog-row:hover,
  .content-row-item:hover,
  .trouble-strip-item:hover {
    transform: none !important;
  }
  
  .btn-primary:hover .arrow {
    transform: none !important;
  }
}