/* Just My Socks - 极简原生 CSS 样式表（零外部依赖，秒开加载） */

:root {
  --bg-page: #ffffff;
  --bg-surface: rgba(255, 255, 255, 0.93);
  --bg-subtle: #ffffff;
  --bg-dark: #ffffff;
  --bg-dark-card: rgba(255, 255, 255, 0.94);
  --border-light: #e2e8f0;
  --border-dark: #e2e8f0;

  --text-main: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-on-dark: #0f172a;
  --text-on-dark-muted: #475569;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-soft: #eff6ff;
  --accent: #06b6d4;
  --success: #10b981;
  --success-soft: #ecfdf5;
  --warning-soft: #fff7ed;
  --warning-text: #c2410c;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-sm: 0 2px 10px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 45px rgba(37, 99, 235, 0.14);

  --container-max: 1160px;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text-main);
  background-color: #ffffff;
  background-image: 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20%20q4%206%200%2012%20q4%206%200%2012%22%20fill%3D%22none%22%20stroke%3D%22%23fbbf24%22%20stroke-width%3D%222.5%22%2F%3E%3Ccircle%20cx%3D%2230%22%20cy%3D%2254%22%20r%3D%229%22%20fill%3D%22%23fbbf24%22%2F%3E%3C%2Fg%3E%3Crect%20x%3D%22-2%22%20y%3D%226%22%20width%3D%2230%22%20height%3D%2211%22%20rx%3D%225%22%20fill%3D%22%23fef3c7%22%20stroke%3D%22%23f59e0b%22%20stroke-width%3D%221.5%22%2F%3E%3C%2Fg%3E%3C%2Fg%3E%3C%2Fsvg%3E");
  background-repeat: repeat;
  background-size: 620px auto;
  background-position: center top;
  background-attachment: fixed;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

/* 按钮规范：醒目、易识别、桌面及手机端均适合手指点击 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background-color 0.18s ease, transform 0.18s ease, border-color 0.18s ease,
    box-shadow 0.18s ease;
  text-align: center;
  white-space: nowrap;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.28);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.36);
}

.btn-accent {
  background: linear-gradient(135deg, #2563eb 0%, #0ea5e9 100%);
  color: #ffffff;
  box-shadow: 0 10px 24px rgba(14, 165, 233, 0.3);
}

.btn-accent:hover {
  filter: brightness(1.06);
}

.btn-outline-light {
  background-color: rgba(255, 255, 255, 0.08);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.28);
}

.btn-outline-light:hover {
  background-color: rgba(255, 255, 255, 0.16);
  border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline-dark {
  background-color: #ffffff;
  color: var(--primary);
  border-color: #bfdbfe;
}

.btn-outline-dark:hover {
  background-color: var(--primary-soft);
  border-color: var(--primary);
}

.btn-sm {
  min-height: 40px;
  padding: 8px 16px;
  font-size: 14px;
}

.btn-block {
  width: 100%;
}

/* 顶部导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-main);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  flex-shrink: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, #2563eb, #06b6d4);
  color: #ffffff;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  transition: color 0.15s ease;
}

.nav-links a:hover,
.nav-links a.nav-active {
  color: var(--primary);
}

.nav-links a.nav-highlight {
  color: var(--primary);
  font-weight: 700;
}

.nav-links a.nav-highlight:hover,
.nav-links a.nav-highlight.nav-active {
  color: var(--primary-hover);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

/* 主视觉区 (Hero) */
.hero {
  position: relative;
  background-color: transparent;
  color: var(--text-main);
  padding: 68px 0 76px;
  border-bottom: 1px solid var(--border-light);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 44px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background-color: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1d4ed8;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--success);
  box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.22);
}

.hero-title {
  font-size: clamp(30px, 4.2vw, 46px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--text-main);
  text-shadow: 0 2px 12px rgba(255, 255, 255, 0.92);
  margin-bottom: 18px;
}

.hero-title .highlight {
  background: linear-gradient(90deg, #2563eb, #0284c7);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-subtitle {
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-secondary);
  text-shadow: 0 1px 10px rgba(255, 255, 255, 0.95);
  margin-bottom: 28px;
  max-width: 600px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 28px;
}

.hero-trust-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  font-size: 14px;
  color: #334155;
  font-weight: 500;
}

.hero-trust-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.hero-trust-item svg {
  color: var(--success);
  flex-shrink: 0;
}

/* Hero 右侧监控状态卡片（纯 HTML+CSS 呈现） */
.hero-panel {
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(6px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--border-light);
}

.panel-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
}

.panel-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: #047857;
  background-color: #ecfdf5;
  border: 1px solid #a7f3d0;
  padding: 4px 10px;
  border-radius: 999px;
}

.node-list {
  display: grid;
  gap: 12px;
  margin-bottom: 18px;
}

.node-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background-color: #f8fafc;
  border: 1px solid var(--border-light);
}

.node-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
}

.node-desc {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.node-tag {
  font-size: 12px;
  font-weight: 600;
  color: #0369a1;
  background-color: #e0f2fe;
  padding: 4px 9px;
  border-radius: 6px;
  white-space: nowrap;
}

.panel-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  padding-top: 14px;
  border-top: 1px solid var(--border-light);
  text-align: center;
}

.metric-value {
  font-size: 18px;
  font-weight: 800;
  color: var(--text-main);
  font-variant-numeric: tabular-nums;
}

.metric-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* 通用区块样式 */
.section {
  padding: 72px 0;
  border-bottom: 1px solid rgba(226, 232, 240, 0.78);
}

.section-white {
  background-color: transparent;
}

.section-subtle {
  background-color: transparent;
}

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 44px;
}

.section-kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  background-color: var(--primary-soft);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-main);
  margin-bottom: 12px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
}

/* 核心优势网格 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.feature-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 26px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: #bfdbfe;
}

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 11px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--primary-soft);
  color: var(--primary);
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-main);
}

.feature-card p {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 流媒体与 AI 支持专场 */
.support-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.support-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
}

.support-card h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.support-card p {
  font-size: 14.5px;
  color: var(--text-secondary);
  margin-bottom: 18px;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 5px 11px;
  font-size: 13px;
  font-weight: 600;
  border-radius: 999px;
  background-color: #f8fafc;
  color: var(--text-main);
  border: 1px solid var(--border-light);
}

.pill-ai {
  background-color: #eff6ff;
  color: #1d4ed8;
  border-color: #bfdbfe;
}

.pill-media {
  background-color: #ecfdf5;
  color: #047857;
  border-color: #a7f3d0;
}

.support-banner {
  margin-top: 28px;
  padding: 22px 26px;
  border-radius: var(--radius-md);
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(4px);
  border: 1px solid #bfdbfe;
  box-shadow: var(--shadow-md);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.support-banner h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 4px;
}

.support-banner p {
  font-size: 14px;
  color: var(--text-secondary);
}

/* 套餐卡片 + 对比表 */
.pricing-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-bottom: 40px;
}

.plan-card {
  position: relative;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 26px 20px 22px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
}

.plan-card.popular {
  border: 2px solid var(--primary);
  box-shadow: var(--shadow-lg);
}

.plan-badge {
  position: absolute;
  top: -12px;
  left: 20px;
  background: linear-gradient(135deg, #2563eb, #0ea5e9);
  color: #ffffff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
}

.plan-name {
  font-size: 18px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 6px;
}

.plan-line {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.plan-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 18px;
  font-variant-numeric: tabular-nums;
}

.plan-price strong {
  font-size: 30px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}

.plan-price span {
  font-size: 13px;
  color: var(--text-muted);
}

.plan-specs {
  display: grid;
  gap: 9px;
  margin-bottom: 22px;
  flex: 1;
}

.plan-specs li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 14px;
  color: var(--text-secondary);
}

.plan-specs li svg {
  color: var(--success);
  flex-shrink: 0;
  margin-top: 3px;
}

/* 套餐详细对比表格 */
.table-wrap {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.table-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 24px;
  background-color: #f8fafc;
  border-bottom: 1px solid var(--border-light);
}

.table-header-bar h3 {
  font-size: 17px;
  font-weight: 700;
}

.table-note {
  font-size: 13px;
  color: var(--text-muted);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-variant-numeric: tabular-nums;
}

.compare-table th,
.compare-table td {
  padding: 15px 18px;
  border-bottom: 1px solid var(--border-light);
  font-size: 14px;
  vertical-align: middle;
}

.compare-table thead th {
  background-color: #f1f5f9;
  color: var(--text-main);
  font-weight: 700;
  font-size: 13.5px;
}

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

.compare-table tbody tr:hover {
  background-color: #f8fafc;
}

.price-cell {
  font-weight: 800;
  color: var(--primary);
  white-space: nowrap;
}

.route-badge {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  background-color: var(--primary-soft);
  color: var(--primary);
}

.route-badge.iplc {
  background-color: var(--warning-soft);
  color: var(--warning-text);
}

.pricing-footnote {
  text-align: center;
  margin-top: 20px;
  font-size: 13.5px;
  color: var(--text-muted);
}

.pricing-footnote a {
  color: var(--primary);
  font-weight: 600;
  text-decoration: underline;
}

/* 用户评价 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.review-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
}

.review-stars {
  color: #f59e0b;
  font-size: 15px;
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.review-text {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.review-author {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid var(--border-light);
}

.author-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb, #06b6d4);
  color: #ffffff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 15px;
  flex-shrink: 0;
}

.author-name {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--text-main);
}

.author-role {
  font-size: 12.5px;
  color: var(--text-muted);
}

.author-plan {
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  background-color: var(--primary-soft);
  padding: 4px 10px;
  border-radius: 999px;
}

/* 常见问题 FAQ（纯原生 details/summary，无需 JS） */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: grid;
  gap: 12px;
}

.faq-item {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.faq-item summary {
  padding: 18px 22px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 600;
  color: var(--primary);
  line-height: 1;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

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

.faq-item[open] summary {
  border-bottom: 1px solid var(--border-light);
  background-color: #f8fafc;
}

.faq-answer {
  padding: 16px 22px 20px;
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* 底部行动号召区 */
.cta-band {
  background-color: rgba(255, 255, 255, 0.78);
  color: var(--text-main);
  padding: 58px 0;
  text-align: center;
  border-top: 1px solid var(--border-light);
}

.cta-band h2 {
  font-size: clamp(24px, 3.2vw, 32px);
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

.cta-band p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 26px;
}

/* 页脚（严格只保留四个标题，点击打开新页面展示） */
.site-footer {
  background-color: rgba(255, 255, 255, 0.95);
  border-top: 1px solid var(--border-light);
  padding: 32px 0;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px 40px;
}

.footer-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 8px 14px;
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: color 0.15s ease, background-color 0.15s ease;
}

.footer-nav a:hover {
  color: var(--primary);
  background-color: var(--primary-soft);
}

/* 独立子页面样式（网站地图、关于我们、服务条款、隐私政策） */
.subpage-hero {
  background-color: transparent;
  color: var(--text-main);
  padding: 46px 0;
  border-bottom: 1px solid var(--border-light);
}

.subpage-hero h1 {
  font-size: clamp(26px, 3.5vw, 36px);
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 10px;
}

.subpage-hero p {
  color: var(--text-secondary);
  font-size: 15.5px;
  max-width: 680px;
}

.subpage-main {
  padding: 48px 0 68px;
}

.doc-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 34px 32px;
  box-shadow: var(--shadow-sm);
  max-width: 900px;
  margin: 0 auto;
}

.doc-section + .doc-section {
  margin-top: 30px;
  padding-top: 28px;
  border-top: 1px solid var(--border-light);
}

.doc-section h2 {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

.doc-section p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 10px;
}

.doc-list {
  display: grid;
  gap: 8px;
  padding-left: 18px;
  list-style: disc;
  color: var(--text-secondary);
  font-size: 15px;
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.sitemap-box {
  background-color: #f8fafc;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 20px;
}

.sitemap-box h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
}

.sitemap-box ul {
  display: grid;
  gap: 10px;
}

.sitemap-box a {
  color: var(--primary);
  font-size: 14.5px;
  font-weight: 500;
}

.sitemap-box a:hover {
  text-decoration: underline;
}

.consult-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 16px;
}

.consult-card {
  background-color: #f8fafc;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 14px;
}

.consult-card h3 {
  font-size: 16.5px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.consult-card p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 0;
}

.consult-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-top: 12px;
  border-top: 1px dashed var(--border-light);
  font-size: 13.5px;
}

.consult-meta strong {
  color: var(--primary);
  font-weight: 800;
}

.carrier-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 14px;
}

.carrier-card {
  background-color: #f8fafc;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 18px;
}

.carrier-card h3 {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.carrier-card p {
  font-size: 13.5px;
  color: var(--text-secondary);
  margin-bottom: 0;
}

.doc-cta {
  margin-top: 28px;
  padding: 20px 22px;
  border-radius: var(--radius-sm);
  background-color: var(--primary-soft);
  border: 1px solid #bfdbfe;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.doc-cta strong {
  display: block;
  font-size: 16px;
  color: var(--text-main);
}

.doc-cta span {
  font-size: 13.5px;
  color: var(--text-secondary);
}

/* ==================== 高科技网格卡片 (Grid Cards) 文章专题区 ==================== */

.tech-hub-section {
  position: relative;
  background-color: transparent;
  background-image:
    linear-gradient(rgba(37, 99, 235, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.04) 1px, transparent 1px);
  background-size: 36px 36px;
  color: var(--text-main);
  padding: 64px 0 76px;
  border-top: 1px solid var(--border-light);
}

.tech-hub-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 40px;
}

.tech-hub-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  background-color: var(--primary-soft);
  border: 1px solid #bfdbfe;
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 14px;
}

.tech-hub-head h2 {
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

.tech-hub-head p {
  font-size: 15.5px;
  color: var(--text-secondary);
}

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

.tech-card {
  position: relative;
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(5px);
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-md);
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
  box-shadow: var(--shadow-md);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  overflow: hidden;
}

.tech-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #2563eb, #06b6d4, #38bdf8);
  opacity: 0.9;
}

.tech-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}

.tech-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.tech-code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 12px;
  font-weight: 700;
  color: #0284c7;
  letter-spacing: 0.06em;
}

.tech-tag {
  font-size: 11.5px;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 6px;
  background-color: var(--primary-soft);
  border: 1px solid #bfdbfe;
  color: #1d4ed8;
  white-space: nowrap;
}

.tech-card-title {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.48;
  color: var(--text-main);
  margin-bottom: 10px;
}

.tech-card-title a:hover {
  color: var(--primary);
}

.tech-card-excerpt {
  font-size: 13.8px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.tech-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid var(--border-light);
}

.tech-wordcount {
  font-size: 12px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.tech-read-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 40px;
  padding: 8px 14px;
  border-radius: 7px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--primary);
  background-color: var(--primary-soft);
  border: 1px solid #bfdbfe;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
  white-space: nowrap;
}

.tech-read-btn:hover {
  background-color: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
}

/* ==================== 独立 SEO 文章阅读页样式 ==================== */

.article-hero {
  background-color: transparent;
  color: var(--text-main);
  padding: 44px 0;
  border-bottom: 1px solid var(--border-light);
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 14px;
}

.article-hero h1 {
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--text-main);
  max-width: 860px;
  margin-bottom: 12px;
}

.article-summary {
  font-size: 15.5px;
  color: var(--text-secondary);
  max-width: 820px;
  line-height: 1.75;
}

.article-wrap {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 36px 38px;
  box-shadow: var(--shadow-sm);
  max-width: 880px;
  margin: 0 auto;
}

.article-body h2 {
  font-size: 21px;
  font-weight: 800;
  color: var(--text-main);
  margin: 28px 0 12px;
  padding-left: 12px;
  border-left: 4px solid var(--primary);
  line-height: 1.4;
}

.article-body h2:first-child {
  margin-top: 0;
}

.article-body h3 {
  font-size: 17.5px;
  font-weight: 700;
  color: var(--text-main);
  margin: 20px 0 8px;
}

.article-body p {
  font-size: 15.5px;
  line-height: 1.88;
  color: #334155;
  margin-bottom: 14px;
}

.article-body ul,
.article-body ol {
  margin: 12px 0 16px;
  padding-left: 20px;
  list-style: disc;
  display: grid;
  gap: 8px;
  color: #334155;
  font-size: 15.5px;
  line-height: 1.8;
}

.article-body ol {
  list-style: decimal;
}

.article-body a {
  color: var(--primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body a:hover {
  color: var(--primary-hover);
}

.article-back-bar {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}

/* ==================== 响应式媒体查询（@media） ==================== */

@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

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

@media (max-width: 768px) {
  body {
    background-size: 360px auto;
    background-attachment: scroll;
  }

  .header-inner {
    flex-wrap: wrap;
    padding: 10px 0;
    gap: 10px;
  }

  .nav-links {
    order: 3;
    width: 100%;
    overflow-x: auto;
    padding-top: 8px;
    border-top: 1px solid var(--border-dark);
    gap: 16px;
    -webkit-overflow-scrolling: touch;
  }

  .nav-links a {
    white-space: nowrap;
    padding: 4px 0;
  }

  .hero {
    padding: 42px 0 48px;
  }

  .hero-cta-group {
    flex-direction: column;
  }

  .hero-cta-group .btn {
    width: 100%;
    min-height: 50px;
  }

  .section {
    padding: 48px 0;
  }

  .section-head {
    margin-bottom: 30px;
  }

  /* 手机端全部核心区块严格单栏显示 */
  .features-grid,
  .support-grid,
  .pricing-cards,
  .reviews-grid,
  .sitemap-grid,
  .consult-grid,
  .carrier-grid,
  .tech-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .tech-hub-section {
    padding: 46px 0 54px;
  }

  .tech-card-footer {
    flex-direction: column;
    align-items: stretch;
  }

  .tech-read-btn {
    width: 100%;
    min-height: 48px;
  }

  .article-wrap {
    padding: 24px 18px;
  }

  .article-back-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .article-back-bar .btn {
    width: 100%;
    min-height: 50px;
  }

  .consult-card .btn {
    width: 100%;
    min-height: 48px;
  }

  .support-banner {
    flex-direction: column;
    align-items: stretch;
    text-align: left;
  }

  .support-banner .btn {
    width: 100%;
  }

  .plan-card .btn,
  .doc-cta .btn,
  .cta-band .btn {
    width: 100%;
    min-height: 50px;
  }

  .table-header-bar {
    flex-direction: column;
    align-items: flex-start;
    padding: 16px;
  }

  /* 手机端对比表转为单栏卡片式展示，无横向溢出错位 */
  .compare-table,
  .compare-table thead,
  .compare-table tbody,
  .compare-table tr,
  .compare-table td {
    display: block;
    width: 100%;
  }

  .compare-table thead {
    display: none;
  }

  .compare-table tbody tr {
    padding: 14px 16px;
    border-bottom: 6px solid #f1f5f9;
  }

  .compare-table tbody tr:last-child {
    border-bottom: none;
  }

  .compare-table td {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 8px 0;
    border-bottom: 1px dashed var(--border-light);
    text-align: right;
  }

  .compare-table td::before {
    content: attr(data-label);
    font-weight: 600;
    color: var(--text-muted);
    font-size: 13px;
    text-align: left;
    flex-shrink: 0;
  }

  .compare-table td.table-action-cell {
    display: block;
    border-bottom: none;
    padding-top: 12px;
  }

  .compare-table td.table-action-cell::before {
    display: none;
  }

  .compare-table td.table-action-cell .btn {
    width: 100%;
    min-height: 48px;
  }

  .doc-card {
    padding: 24px 18px;
  }

  /* 手机端页脚四个标题保持整齐且易点按 */
  .footer-nav {
    flex-direction: column;
    gap: 8px;
  }

  .footer-nav a {
    width: 100%;
    min-height: 48px;
  }
}

@media (max-width: 420px) {
  .container {
    padding: 0 16px;
  }

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

  .header-actions .btn {
    padding: 8px 14px;
    font-size: 13.5px;
    min-height: 42px;
  }
}