/* ==========================================================================
   网际快车 (Flash Express) - 原生极简高能 CSS
   特性：0 外部依赖、秒开级渲染、全响应式适配、现代清爽浅色科技美学 (Light Theme)
   ========================================================================== */

:root {
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-surface: #f1f5f9;
  --border-color: #e2e8f0;
  --border-highlight: rgba(37, 99, 235, 0.4);
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #64748b;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-glow: rgba(37, 99, 235, 0.25);
  --accent-cyan: #0284c7;
  --accent-purple: #7c3aed;
  --accent-gold: #d97706;
  --success: #059669;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 16px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
  --shadow-lg: 0 12px 30px -4px rgba(15, 23, 42, 0.08), 0 4px 12px -2px rgba(15, 23, 42, 0.03);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --container-width: 1200px;
}

/* 全局重置与基础样式 */
*, *::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);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background: radial-gradient(circle at 50% 0%, #e8f0fe 0%, #f8fafc 45%, #ffffff 100%);
  min-height: 100vh;
  overflow-x: hidden;
  font-size: 16px;
  color: var(--text-main);
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

img, svg {
  vertical-align: middle;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 顶部导航条 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.03);
}

.navbar .nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.brand-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--primary));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
  overflow: hidden;
  flex-shrink: 0;
}

.brand-logo .logo-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.brand-logo span {
  background: linear-gradient(120deg, #0f172a 40%, var(--primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 按钮通用规范 (严格优化手指点击尺寸) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  text-align: center;
  white-space: nowrap;
  min-height: 46px;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-cyan) 100%);
  color: #ffffff;
  box-shadow: 0 4px 16px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.4);
  filter: brightness(1.05);
}

.btn-secondary {
  background: #ffffff;
  color: var(--text-main);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-glow {
  position: relative;
  overflow: hidden;
}

.btn-glow::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.3s;
}

.btn-glow:hover::after {
  opacity: 1;
}

.btn-lg {
  padding: 15px 32px;
  font-size: 1.08rem;
  min-height: 52px;
}

/* 主视觉区 (Hero Section) */
.hero-section {
  padding: 85px 0 65px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.22);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  color: #1d4ed8;
  margin-bottom: 24px;
  font-weight: 500;
}

.hero-pill .pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--success);
  box-shadow: 0 0 8px var(--success);
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 22px;
  color: var(--text-main);
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #0f172a 20%, #2563eb 65%, #0284c7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.22rem;
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

/* 高科技 5G 旗舰网络主视觉展示区 (Hero Showcase) */
.hero-showcase {
  max-width: 1040px;
  margin: 0 auto 46px;
  padding: 0 12px;
}

.hero-showcase-frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 50px -10px rgba(37, 99, 235, 0.2), 0 0 0 1px rgba(37, 99, 235, 0.16);
  background: var(--bg-card);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero-showcase-frame:hover {
  transform: translateY(-4px);
  box-shadow: 0 26px 60px -10px rgba(37, 99, 235, 0.28), 0 0 0 1px rgba(37, 99, 235, 0.32);
}

.hero-showcase-img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.hero-showcase-badge {
  position: absolute;
  bottom: 20px;
  left: 20px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  background: rgba(15, 23, 42, 0.78);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--radius-full);
  color: #ffffff;
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.hero-trust-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 960px;
  margin: 0 auto;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.trust-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.trust-num {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.trust-num span {
  color: var(--primary);
}

.trust-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* 通用区块排版 */
.section {
  padding: 80px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 52px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  color: var(--text-main);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* 核心优势卡片 (Core Advantages) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-md);
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-highlight);
  box-shadow: var(--shadow-lg);
}

.feature-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: #eff6ff;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--primary);
  border: 1px solid #dbeafe;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* 流媒体与 AI 支持专区 (Streaming & AI) */
.support-section {
  background: #f1f5f9;
}

.support-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.support-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.support-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
}

.support-box.streaming::before {
  background: linear-gradient(90deg, #ef4444, #f97316);
}

.support-box.ai::before {
  background: linear-gradient(90deg, #8b5cf6, #0284c7);
}

.support-box-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.support-box-header .box-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background: #eff6ff;
}

.support-box h3 {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
}

.support-box p {
  color: var(--text-muted);
  margin-bottom: 24px;
  font-size: 0.96rem;
}

.badge-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.service-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 500;
  color: #334155;
}

.service-pill .pill-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
}

/* 套餐对比表 (Pricing Section) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 26px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-md);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: #cbd5e1;
  box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
  border: 2px solid var(--primary);
  background: linear-gradient(180deg, #eff6ff 0%, #ffffff 100%);
  box-shadow: 0 10px 32px rgba(37, 99, 235, 0.15);
}

.pricing-ribbon {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #2563eb, #0284c7);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
}

.pricing-header {
  margin-bottom: 22px;
}

.pricing-tier {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.pricing-tier-desc {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.pricing-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 18px 0;
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
}

.price-amount {
  font-size: 2.7rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1;
}

.price-period {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.pricing-features {
  list-style: none;
  margin: 20px 0 32px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 13px;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.pricing-features li strong {
  color: var(--text-main);
}

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

.pricing-card .btn {
  width: 100%;
}

/* 用户评价 (Testimonials) */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-md);
}

.review-stars {
  color: var(--accent-gold);
  margin-bottom: 14px;
  display: flex;
  gap: 3px;
}

.review-content {
  color: #334155;
  font-size: 0.96rem;
  line-height: 1.68;
  margin-bottom: 22px;
}

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

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #eff6ff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--primary);
  border: 1px solid #dbeafe;
}

.author-info h4 {
  font-size: 0.95rem;
  color: var(--text-main);
  font-weight: 600;
}

.author-info p {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* 常见问题解答 (FAQ - 纯 HTML5 Details/Summary，秒开免 JS) */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

details.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  transition: all 0.25s ease;
  box-shadow: var(--shadow-sm);
}

details.faq-item[open] {
  border-color: rgba(37, 99, 235, 0.4);
  background: #ffffff;
  box-shadow: var(--shadow-md);
}

summary.faq-question {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  outline: none;
  user-select: none;
}

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

.faq-chevron {
  transition: transform 0.25s ease;
  color: var(--text-dim);
}

details.faq-item[open] .faq-chevron {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid #f1f5f9;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* 底部 CTA 条幅 (Bottom CTA) */
.cta-banner {
  margin: 40px auto 70px;
  background: linear-gradient(135deg, #1e40af 0%, #2563eb 55%, #0284c7 100%);
  border: 1px solid rgba(37, 99, 235, 0.25);
  border-radius: var(--radius-lg);
  padding: 56px 36px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 12px 36px rgba(37, 99, 235, 0.25);
  color: #ffffff;
}

.cta-banner h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: #ffffff;
}

.cta-banner p {
  color: #e0f2fe;
  font-size: 1.08rem;
  max-width: 600px;
  margin: 0 auto 30px;
}

.cta-banner .btn-primary {
  background: #ffffff;
  color: #1e40af;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.15);
}

.cta-banner .btn-primary:hover {
  background: #f8fafc;
  color: #1d4ed8;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

/* 页脚 (严格遵守只保留四个标题并打开新页展示要求) */
.site-footer {
  border-top: 1px solid var(--border-color);
  background: #f8fafc;
  padding: 45px 0 35px;
  text-align: center;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: color 0.2s;
  padding: 6px 12px;
}

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

.footer-copyright {
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* 页面文章/详情页样式 (关于我们、服务条款、隐私政策、网站地图共用) */
.legal-wrapper {
  max-width: 860px;
  margin: 60px auto 100px;
  padding: 44px 36px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

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

.legal-title {
  font-size: 2.3rem;
  font-weight: 800;
  margin-bottom: 10px;
  color: var(--text-main);
}

.legal-meta {
  color: var(--text-dim);
  font-size: 0.88rem;
}

.legal-content h2 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 32px 0 14px;
  padding-left: 12px;
  border-left: 4px solid var(--primary);
}

.legal-content h3 {
  font-size: 1.15rem;
  color: var(--text-main);
  margin: 20px 0 10px;
}

.legal-content p {
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.8;
  font-size: 0.98rem;
}

.legal-content ul, .legal-content ol {
  color: var(--text-muted);
  margin: 12px 0 20px 24px;
  line-height: 1.8;
}

.legal-content li {
  margin-bottom: 8px;
}

.legal-highlight-box {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 24px 0;
  color: #1e40af;
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 24px;
}

.sitemap-card {
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px;
}

.sitemap-card h3 {
  font-size: 1.15rem;
  color: var(--primary);
  margin-bottom: 12px;
}

.sitemap-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sitemap-card li {
  margin-bottom: 10px;
}

.sitemap-card a {
  color: var(--text-muted);
}

.sitemap-card a:hover {
  color: var(--primary);
  text-decoration: underline;
}

/* 高科技网格卡片 (Grid Cards) - 推荐咨询文章库 */
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  margin-top: 36px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-md);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent-cyan));
  opacity: 0;
  transition: opacity 0.3s;
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-highlight);
  box-shadow: var(--shadow-lg);
}

.article-card:hover::before {
  opacity: 1;
}

.article-card-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: #eff6ff;
  border: 1px solid #dbeafe;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 14px;
  width: fit-content;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text-main);
  margin-bottom: 12px;
  transition: color 0.2s;
}

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

.article-card-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
  font-size: 0.82rem;
  color: var(--text-dim);
}

.article-card-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-weight: 600;
  color: var(--primary);
  font-size: 0.9rem;
}

.article-card-link:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

/* ==========================================================================
   响应式媒体查询 (@media 移动端极致适配)
   ========================================================================== */

@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
  }

  .container {
    padding-left: 18px;
    padding-right: 18px;
  }

  .navbar {
    padding: 12px 0;
  }

  .nav-links {
    display: none; /* 移动端隐藏冗余导航，保留核心 CTA */
  }

  .hero-section {
    padding: 50px 0 40px;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .hero-subtitle {
    font-size: 1.02rem;
    margin-bottom: 28px;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }

  .hero-cta-group .btn {
    width: 100%;
  }

  .hero-showcase {
    margin-bottom: 28px;
    padding: 0 4px;
  }

  .hero-showcase-badge {
    bottom: 10px;
    left: 10px;
    font-size: 0.74rem;
    padding: 6px 12px;
    max-width: calc(100% - 20px);
    white-space: normal;
  }

  .hero-trust-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 18px 14px;
  }

  .trust-num {
    font-size: 1.45rem;
  }

  .section {
    padding: 55px 0;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .features-grid {
    grid-template-columns: 1fr; /* 完美单栏显示 */
    gap: 18px;
  }

  .support-container {
    grid-template-columns: 1fr; /* 完美单栏显示 */
    gap: 20px;
  }

  .pricing-grid {
    grid-template-columns: 1fr; /* 完美单栏显示 */
    gap: 24px;
  }

  .pricing-card {
    padding: 30px 22px;
  }

  .reviews-grid {
    grid-template-columns: 1fr; /* 完美单栏显示 */
    gap: 18px;
  }

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

  .article-grid {
    grid-template-columns: 1fr; /* 完美单栏显示 */
    gap: 18px;
  }

  .cta-banner {
    padding: 38px 20px;
    margin: 30px auto 50px;
  }

  .cta-banner h2 {
    font-size: 1.7rem;
  }

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

  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }

  .btn {
    min-height: 48px; /* 移动端触控黄金手感，不误触 */
    font-size: 1rem;
  }

  .legal-wrapper {
    margin: 30px auto 60px;
    padding: 26px 18px;
  }

  .legal-title {
    font-size: 1.75rem;
  }
}