:root {
  --color-primary: #ff6b00;
  --color-primary-dark: #e65f00;
  --color-primary-soft: #fff1e6;
  --color-text: #1a1a1a;
  --color-muted: #5f6368;
  --color-border: rgba(0, 0, 0, 0.08);
  --color-bg: #f9f9f9;
  --color-card: #ffffff;
  --shadow-card: 0 18px 45px rgba(20, 20, 20, 0.07);
  --radius-lg: 32px;
  --radius-md: 22px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Inter, system-ui, -apple-system, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
}

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

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

.container {
  width: min(var(--container), calc(100% - 40px));
  margin-inline: auto;
}

.narrow {
  max-width: 820px;
}

.skip-link,
.screen-reader-text {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.skip-link:focus {
  z-index: 9999;
  width: auto;
  height: auto;
  clip: auto;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(249, 249, 249, 0.88);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(14px);
}

.header-inner {
  min-height: 76px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-brand,
.custom-logo-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
}

.custom-logo {
  max-height: 48px;
  width: auto;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), #ff9b44);
  border-radius: 14px;
}

.brand-name,
.footer-brand {
  font-size: 1.08rem;
  font-weight: 800;
}

.primary-nav {
  margin-left: auto;
}

.menu,
.footer-menu {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.menu a {
  color: var(--color-muted);
  font-weight: 600;
}

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

.nav-toggle {
  display: none;
  margin-left: auto;
  padding: 8px;
  background: transparent;
  border: 0;
}

.nav-toggle span:not(.screen-reader-text) {
  display: block;
  width: 24px;
  height: 2px;
  margin: 5px 0;
  background: var(--color-text);
}

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 46px;
  padding: 10px 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 800;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  color: #fff;
  background: var(--color-primary);
  box-shadow: 0 12px 26px rgba(255, 107, 0, 0.26);
}

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

.btn-outline {
  color: var(--color-primary);
  border-color: rgba(255, 107, 0, 0.35);
  background: #fff;
}

.hero {
  padding: 78px 0 34px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(340px, 0.78fr);
  gap: 48px;
  align-items: center;
}

.eyebrow,
.section-kicker {
  margin: 0 0 12px;
  color: var(--color-primary);
  font-weight: 900;
  letter-spacing: 0.03em;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 780px;
  margin-bottom: 20px;
  font-size: clamp(2.45rem, 6vw, 4.65rem);
  line-height: 1.12;
  letter-spacing: -0.06em;
  background: linear-gradient(135deg, var(--color-primary), #ff9b44);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  line-height: 1.24;
  letter-spacing: -0.04em;
}

h3 {
  font-size: 1.22rem;
  line-height: 1.35;
}

.hero-lead,
.section-sub,
.page-hero p {
  color: var(--color-muted);
  font-size: 1.12rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 30px 0 18px;
}

.trust-line {
  color: var(--color-muted);
  font-weight: 700;
}

.hero-panel {
  position: relative;
  min-height: 430px;
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: 42px;
  background:
    radial-gradient(circle at top right, rgba(255, 107, 0, 0.18), transparent 36%),
    #fff;
  box-shadow: var(--shadow-card);
}

.latency-card {
  display: inline-grid;
  gap: 4px;
  padding: 18px 22px;
  border-radius: 24px;
  background: var(--color-text);
  color: #fff;
}

.latency-card strong {
  font-size: 2.4rem;
  line-height: 1;
  color: #ffb36c;
}

.speed-meter {
  display: flex;
  align-items: end;
  gap: 12px;
  height: 150px;
  margin: 42px 0;
}

.speed-meter span {
  flex: 1;
  border-radius: 16px 16px 6px 6px;
  background: linear-gradient(180deg, #ffb36c, var(--color-primary));
}

.speed-meter span:nth-child(1) { height: 38%; }
.speed-meter span:nth-child(2) { height: 62%; }
.speed-meter span:nth-child(3) { height: 84%; }
.speed-meter span:nth-child(4) { height: 100%; }

.route-list {
  display: grid;
  gap: 12px;
}

.route-list div {
  display: flex;
  justify-content: space-between;
  padding: 13px 15px;
  border-radius: 16px;
  background: #f7f7f7;
}

.connection-card {
  display: grid;
  gap: 12px;
  margin: 34px 0;
}

.connection-card div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 16px;
  border: 1px solid var(--color-border);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.78);
}

.connection-card span {
  color: var(--color-muted);
}

.stats-strip {
  padding: 20px 0 52px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: 34px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
}

.stat-item {
  text-align: center;
}

.stat-item strong {
  display: block;
  color: var(--color-primary);
  font-size: 2.1rem;
  line-height: 1.1;
}

.stat-item span {
  color: var(--color-muted);
  font-weight: 700;
}

.section {
  padding: 72px 0;
  border-top: 1px solid rgba(0, 0, 0, 0.04);
}

.split-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  gap: 42px;
  align-items: center;
}

.product-intro .section-kicker,
.product-intro h2 {
  text-align: left;
}

.product-intro p {
  color: var(--color-muted);
}

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

.intro-card-grid div,
.platform-card,
.advantage-card,
.scenario-card,
.news-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.035);
}

.intro-card-grid div {
  padding: 22px;
}

.intro-card-grid strong {
  display: block;
  margin-bottom: 6px;
  font-size: 1.12rem;
}

.intro-card-grid span {
  color: var(--color-muted);
}

.soft-bg {
  background: #fff;
}

.section .section-kicker,
.section h2,
.section-sub {
  text-align: center;
}

.section-sub {
  max-width: 700px;
  margin-inline: auto;
  margin-bottom: 34px;
}

.feature-grid,
.pricing-grid,
.review-grid,
.post-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.feature-card,
.pricing-card,
.post-card,
.article-card,
.sidebar-card,
.map-card,
.tab-panel,
.review-grid blockquote,
.score-card,
.article-cta {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-card);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.035);
}

.feature-card,
.pricing-card,
.post-card a,
.article-card a,
.sidebar-card,
.map-card,
.tab-panel,
.review-grid blockquote,
.score-card,
.article-cta {
  padding: 26px;
}

.feature-card,
.pricing-card,
.post-card,
.article-card {
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover,
.pricing-card:hover,
.post-card:hover,
.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.feature-icon {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  margin-bottom: 18px;
  border-radius: 20px;
  background: var(--color-primary-soft);
  font-size: 1.7rem;
}

.text-icon {
  width: auto;
  min-width: 56px;
  padding: 0 10px;
  color: var(--color-primary-dark);
  font-size: 0.94rem;
  font-weight: 900;
}

.feature-card p,
.post-card p,
.article-card p,
.review-grid blockquote,
.pricing-card li {
  color: var(--color-muted);
}

.tabs {
  max-width: 920px;
  margin: 0 auto;
}

.tab-buttons {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 18px;
}

.tab-btn {
  padding: 10px 24px;
  border: 0;
  border-radius: 999px;
  background: #f0f0f0;
  color: var(--color-muted);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.tab-btn.active {
  color: #fff;
  background: var(--color-primary);
}

.tab-panel {
  display: none;
  text-align: center;
}

.tab-panel.active {
  display: block;
}

.tab-panel strong {
  color: var(--color-primary);
}

.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
}

.compare-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  overflow: hidden;
  background: #fff;
}

.compare-table th,
.compare-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
}

.compare-table th {
  background: var(--color-primary-soft);
}

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

.score-card div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

meter {
  width: 100%;
  height: 12px;
}

.map-card {
  text-align: center;
}

.map-card-large {
  padding: 34px;
  background:
    radial-gradient(circle at top, rgba(255, 107, 0, 0.13), transparent 42%),
    #fff;
}

.region-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 22px;
}

.region-list span {
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
  font-weight: 800;
}

.review-grid blockquote {
  margin: 0;
}

.review-grid cite {
  display: block;
  margin-top: 16px;
  color: var(--color-text);
  font-style: normal;
  font-weight: 800;
}

.pricing-card {
  position: relative;
}

.pricing-card.popular {
  border-color: rgba(255, 107, 0, 0.6);
  background: linear-gradient(180deg, #fffaf5, #fff);
}

.badge {
  display: inline-flex;
  margin-bottom: 14px;
  padding: 4px 12px;
  border-radius: 999px;
  color: #fff;
  background: var(--color-primary);
  font-weight: 900;
}

.price {
  margin: 12px 0 18px;
  font-size: 2.35rem;
  font-weight: 900;
}

.price small {
  color: var(--color-muted);
  font-size: 0.95rem;
}

.pricing-card ul,
.sidebar-card ul {
  padding-left: 1.2em;
}

.pricing-card .btn {
  width: 100%;
  margin-top: 10px;
}

.trust-summary,
.pricing-note {
  margin: 28px auto 0;
  color: var(--color-muted);
  text-align: center;
  font-weight: 800;
}

.pricing-note {
  color: var(--color-primary-dark);
}

.download-section {
  padding: 48px 0;
}

.download-box,
.final-cta-box {
  display: flex;
  justify-content: space-between;
  gap: 28px;
  align-items: center;
  padding: 34px;
  border-radius: 36px;
  background: #171717;
  color: #fff;
}

.download-box h2,
.final-cta-box h2 {
  color: #fff;
  text-align: left;
}

.download-box p,
.final-cta-box p {
  max-width: 680px;
  color: rgba(255, 255, 255, 0.74);
}

.download-actions {
  display: grid;
  gap: 12px;
  min-width: 230px;
  text-align: center;
}

.download-actions span {
  color: rgba(255, 255, 255, 0.74);
  font-size: 0.94rem;
}

.platform-grid,
.advantage-grid,
.scenario-grid {
  display: grid;
  gap: 20px;
}

.platform-grid {
  grid-template-columns: repeat(5, 1fr);
}

.advantage-grid,
.scenario-grid {
  grid-template-columns: repeat(3, 1fr);
}

.platform-card,
.advantage-card,
.scenario-card {
  padding: 24px;
}

.platform-card h3 {
  color: var(--color-primary);
}

.platform-card p,
.advantage-card p,
.scenario-card p {
  color: var(--color-muted);
}

.scenario-card strong {
  display: block;
  margin-top: 16px;
  color: var(--color-primary);
}

.advantage-card ul {
  display: grid;
  gap: 8px;
  margin: 18px 0 0;
  padding-left: 1.2em;
  color: var(--color-muted);
}

.guarantee-grid {
  grid-template-columns: repeat(4, 1fr);
}

.faq-list {
  display: grid;
  gap: 14px;
  max-width: 860px;
  margin: 0 auto;
}

.faq-columns {
  max-width: 1040px;
  grid-template-columns: repeat(2, 1fr);
}

details {
  padding: 20px 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: #fff;
}

summary {
  font-weight: 900;
  cursor: pointer;
}

details p {
  margin: 12px 0 0;
  color: var(--color-muted);
}

.more-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 28px;
}

.more-links h3 {
  flex-basis: 100%;
  margin-bottom: 2px;
  text-align: center;
}

.more-links a {
  color: var(--color-primary);
  font-weight: 900;
}

.final-cta {
  padding: 48px 0;
}

.final-cta-box {
  justify-content: center;
  flex-direction: column;
  text-align: center;
}

.final-cta-box h2 {
  text-align: center;
}

.news-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.news-item a,
.news-item.placeholder {
  display: block;
  padding: 24px;
}

.news-item span {
  display: block;
  margin-bottom: 10px;
  color: var(--color-primary);
  font-weight: 900;
}

.news-item h3 {
  margin-bottom: 10px;
}

.news-item p {
  color: var(--color-muted);
}

.news-item strong {
  color: var(--color-primary);
}

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

.blog-highlight-grid article {
  padding: 26px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.035);
}

.blog-highlight-grid span {
  display: block;
  margin-bottom: 14px;
  font-size: 2rem;
}

.blog-highlight-grid p,
.blog-highlight-grid small {
  color: var(--color-muted);
}

.blog-highlight-grid small {
  font-weight: 800;
}

.section-head-row {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: end;
  margin-bottom: 28px;
}

.section-head-row .section-kicker,
.section-head-row h2 {
  text-align: left;
}

.text-link {
  color: var(--color-primary);
  font-weight: 900;
}

.post-card a,
.article-card a {
  display: block;
}

.post-card span,
.article-date {
  color: var(--color-primary);
  font-weight: 900;
}

.site-footer {
  padding: 56px 0 24px;
  color: rgba(255, 255, 255, 0.72);
  background: #171717;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr;
  gap: 36px;
}

.site-footer h2,
.footer-brand {
  color: #fff;
}

.site-footer h2 {
  font-size: 1.05rem;
  letter-spacing: 0;
}

.footer-menu {
  display: grid;
  gap: 8px;
}

.footer-menu a:hover {
  color: #fff;
}

.footer-note {
  color: #ffb36c;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.page-hero {
  padding: 78px 0 34px;
}

.page-hero.compact {
  padding: 62px 0 34px;
  background:
    radial-gradient(circle at top left, rgba(255, 107, 0, 0.16), transparent 32%),
    #fff;
}

.archive-note {
  display: inline-block;
  margin-top: 14px;
  padding: 10px 14px;
  border-radius: 14px;
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
  font-size: 0.95rem;
  font-weight: 800;
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 28px;
  align-items: start;
}

.article-list {
  display: grid;
  gap: 18px;
}

.article-thumb,
.single-thumb {
  width: 100%;
  border-radius: var(--radius-md);
  object-fit: cover;
}

.single-thumb {
  margin-bottom: 28px;
}

.breadcrumbs {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
  color: var(--color-primary);
  font-weight: 800;
}

.post-meta {
  color: var(--color-muted);
}

.article-content {
  padding: 48px 0 72px;
}

.article-content h2,
.article-content h3 {
  margin-top: 1.6em;
}

.article-content a {
  color: var(--color-primary);
  font-weight: 800;
}

.article-content blockquote {
  margin-inline: 0;
  padding: 18px 22px;
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: #fff;
}

.article-toc {
  margin-bottom: 30px;
  padding: 24px 26px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.035);
}

.article-toc strong {
  display: block;
  margin-bottom: 12px;
  font-size: 1.15rem;
}

.article-toc ol {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 1.25em;
}

.article-toc a {
  color: var(--color-text);
}

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

.toc-level-3 {
  margin-left: 1.2em;
  font-size: 0.96rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--color-border);
}

.tag-list span {
  color: var(--color-muted);
  font-weight: 800;
}

.tag-list a {
  display: inline-flex;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
}

.author-box {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 18px;
  margin-top: 34px;
  padding: 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: #fff;
}

.author-avatar img {
  border-radius: 999px;
}

.author-box h2 {
  margin-bottom: 8px;
  font-size: 1.25rem;
  letter-spacing: 0;
  text-align: left;
}

.author-box p {
  margin-bottom: 8px;
  color: var(--color-muted);
}

.author-meta {
  font-size: 0.94rem;
}

.article-cta {
  margin-top: 42px;
  text-align: center;
}

.related-posts {
  margin-top: 44px;
}

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

.mini-post-grid article {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: #fff;
}

.mini-post-grid a {
  display: block;
  padding: 20px;
  color: var(--color-text);
}

.mini-post-grid span {
  display: block;
  margin-bottom: 8px;
  color: var(--color-primary);
  font-weight: 900;
}

.mini-post-grid h3 {
  margin-bottom: 0;
  font-size: 1.02rem;
}

.pagination-nav {
  margin-top: 28px;
}

.page-numbers {
  display: inline-flex;
  min-width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  margin-right: 6px;
  padding: 0 10px;
  border-radius: 12px;
  background: #fff;
  border: 1px solid var(--color-border);
}

.page-numbers.current {
  color: #fff;
  background: var(--color-primary);
}

@media (max-width: 1024px) {
  .hero-grid,
  .split-grid,
  .content-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .feature-grid,
  .pricing-grid,
  .review-grid,
  .post-grid,
  .blog-highlight-grid,
  .advantage-grid,
  .scenario-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 820px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
    padding: 14px 0;
  }

  .nav-toggle {
    display: block;
  }

  .header-cta {
    display: none;
  }

  .primary-nav {
    display: none;
    width: 100%;
    margin-left: 0;
  }

  .primary-nav.is-open {
    display: block;
  }

  .menu {
    display: grid;
    gap: 10px;
    padding: 14px 0 4px;
  }

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

  .hero {
    padding-top: 42px;
  }

  .hero-panel {
    min-height: auto;
  }
}

@media (max-width: 620px) {
  .container {
    width: min(100% - 28px, var(--container));
  }

  .feature-grid,
  .pricing-grid,
  .review-grid,
  .post-grid,
  .mini-post-grid,
  .stats-grid,
  .score-grid {
    grid-template-columns: 1fr;
  }

  .section,
  .article-content {
    padding: 50px 0;
  }

  .tab-buttons,
  .hero-actions,
  .section-head-row,
  .footer-bottom,
  .download-box {
    align-items: stretch;
    flex-direction: column;
  }

  .tab-btn,
  .hero-actions .btn {
    width: 100%;
  }

  .intro-card-grid,
  .platform-grid,
  .advantage-grid,
  .scenario-grid,
  .guarantee-grid,
  .blog-highlight-grid,
  .faq-columns,
  .news-list {
    grid-template-columns: 1fr;
  }

  .compare-table {
    min-width: 640px;
  }

  .author-box {
    grid-template-columns: 1fr;
  }
}