/* ===================================================================
   gatern - 现代化纯原生 CSS (Modern Minimalist & Mobile-First)
   极致轻量，零外部框架依赖，秒开级加载体验
   =================================================================== */

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(59, 130, 246, 0.4);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --primary: #2563eb;
  --primary-light: #3b82f6;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-purple: #8b5cf6;
  --accent-amber: #f59e0b;
  --danger: #ef4444;
  
  --gradient-brand: linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%);
  --gradient-glow: radial-gradient(circle at 50% 0%, rgba(59, 130, 246, 0.18), transparent 70%);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 25px rgba(59, 130, 246, 0.25);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.65;
  background-image: 
    radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.12) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(6, 182, 212, 0.08) 0px, transparent 50%),
    radial-gradient(at 50% 50%, rgba(139, 92, 246, 0.05) 0px, transparent 50%);
  background-attachment: fixed;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

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

/* 布局容器 */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* 顶部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 14px 0;
}

.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;
}

.logo-badge {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.35);
}

.logo-text {
  background: linear-gradient(135deg, #ffffff 30%, #93c5fd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-sub {
  font-size: 0.72rem;
  font-weight: 500;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

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

.nav-link:hover {
  color: #ffffff;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  text-align: center;
  text-decoration: none !important;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #ffffff !important;
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.35);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
  filter: brightness(1.1);
  color: #ffffff !important;
  text-decoration: none !important;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main) !important;
  border-color: var(--border-color);
  text-decoration: none !important;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  color: #ffffff !important;
  text-decoration: none !important;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 14px 30px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

.btn-block {
  width: 100%;
}

/* 主视觉区 (Hero Section) */
.hero-section {
  padding: 70px 0 60px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.3);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  margin-bottom: 20px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1.15); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 3rem;
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero-title .highlight {
  background: linear-gradient(135deg, #60a5fa 0%, #22d3ee 50%, #34d399 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 32px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 36px;
}

.hero-guarantee {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 0.88rem;
  color: var(--text-dim);
}

.guarantee-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.guarantee-item svg {
  color: var(--accent-emerald);
  width: 16px;
  height: 16px;
}

/* 主视觉动态展示卡片 (纯 CSS 科技感动态控制台) */
.dynamic-hero-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-md), var(--shadow-glow);
  overflow: hidden;
}

.dynamic-hero-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-brand);
}

.dash-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 14px;
  margin-bottom: 18px;
}

.dash-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-emerald);
}

.dash-badge {
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: rgba(14, 165, 233, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(14, 165, 233, 0.3);
}

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

.node-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.03);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: var(--transition);
}

.node-item:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(59, 130, 246, 0.3);
}

.node-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.node-flag {
  font-size: 1.15rem;
}

.node-name {
  font-weight: 600;
  font-size: 0.92rem;
}

.node-tag {
  font-size: 0.72rem;
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.1);
  padding: 1px 6px;
  border-radius: 4px;
}

.node-ping {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-emerald);
  font-family: monospace;
}

.signal-bar {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 12px;
}

.signal-bar span {
  width: 3px;
  background: var(--accent-emerald);
  border-radius: 1px;
}

.signal-bar span:nth-child(1) { height: 4px; }
.signal-bar span:nth-child(2) { height: 7px; }
.signal-bar span:nth-child(3) { height: 10px; }
.signal-bar span:nth-child(4) { height: 12px; }

/* 测速动态动效条 */
.speed-meter-box {
  background: rgba(0, 0, 0, 0.25);
  border-radius: var(--radius-md);
  padding: 14px;
  border: 1px solid var(--border-color);
}

.speed-meta {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.speed-val {
  color: var(--text-main);
  font-weight: 700;
  font-family: monospace;
}

.progress-track {
  height: 8px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.progress-bar-glow {
  height: 100%;
  width: 92%;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
  position: relative;
  animation: meterPulse 2.5s ease-in-out infinite alternate;
}

@keyframes meterPulse {
  0% { width: 85%; }
  100% { width: 97%; }
}

/* 通用板块样式 */
.section {
  padding: 80px 0;
}

.section-alt {
  background: rgba(17, 24, 39, 0.45);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.25);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 核心优势板块 (3个图文卡片) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-md), 0 0 20px rgba(59, 130, 246, 0.15);
  background: var(--bg-card-hover);
}

.feature-icon-wrapper {
  width: 60px;
  height: 60px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  background: rgba(59, 130, 246, 0.12);
  color: var(--primary-light);
  border: 1px solid rgba(59, 130, 246, 0.25);
}

.feature-card:nth-child(2) .feature-icon-wrapper {
  background: rgba(6, 182, 212, 0.12);
  color: var(--accent-cyan);
  border-color: rgba(6, 182, 212, 0.25);
}

.feature-card:nth-child(3) .feature-icon-wrapper {
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent-emerald);
  border-color: rgba(16, 185, 129, 0.25);
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 18px;
  flex-grow: 1;
}

.feature-bullets {
  list-style: none;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

.feature-bullets li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-main);
  margin-bottom: 8px;
}

.feature-bullets li svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}

/* 流媒体与 AI 支持图卡 */
.media-ai-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.media-ai-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
}

.media-ai-card:hover {
  border-color: rgba(59, 130, 246, 0.35);
  box-shadow: var(--shadow-md);
}

.media-ai-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.media-ai-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

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

.service-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  padding: 8px 14px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-main);
  transition: var(--transition);
}

.service-pill:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--primary-light);
}

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

/* 价格对比表 (Pricing) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px 22px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: rgba(59, 130, 246, 0.4);
  box-shadow: var(--shadow-md);
}

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(30, 58, 138, 0.3) 0%, rgba(17, 24, 39, 0.85) 100%);
  border: 2px solid var(--primary-light);
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.25);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-6px);
}

.popular-ribbon {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-brand);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.84rem;
  color: var(--text-dim);
  margin-bottom: 20px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.price-currency {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-light);
}

.price-amount {
  font-size: 2.4rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1;
}

.price-period {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.plan-specs {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
  flex-grow: 1;
}

.plan-specs li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.plan-specs li.highlight {
  color: var(--text-main);
  font-weight: 600;
}

.plan-specs li svg {
  color: var(--accent-emerald);
  flex-shrink: 0;
  width: 16px;
  height: 16px;
}

/* 9篇 SEO 文章板块 (放置在价格板块下方) */
.seo-articles-section {
  padding: 80px 0;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: rgba(59, 130, 246, 0.4);
  box-shadow: var(--shadow-md);
}

.article-visual {
  height: 160px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.article-visual-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.25;
  background-image: radial-gradient(rgba(255, 255, 255, 0.2) 1px, transparent 1px);
  background-size: 16px 16px;
}

.article-visual-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  background: rgba(10, 14, 23, 0.75);
  backdrop-filter: blur(8px);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.article-visual-icon {
  font-size: 2.8rem;
  z-index: 1;
}

.article-content {
  padding: 22px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 10px;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

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

.article-excerpt {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex-grow: 1;
}

.article-footer {
  border-top: 1px solid var(--border-color);
  padding-top: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.read-more-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary-light);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.read-more-link:hover {
  color: var(--accent-cyan);
  gap: 8px;
}

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

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 26px;
  transition: var(--transition);
}

.testimonial-card:hover {
  border-color: rgba(59, 130, 246, 0.3);
}

.rating-stars {
  color: #fbbf24;
  margin-bottom: 14px;
  font-size: 1rem;
  letter-spacing: 2px;
}

.testimonial-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  color: #ffffff;
}

.user-name {
  font-weight: 600;
  font-size: 0.92rem;
}

.user-role {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* FAQ 常见问题解答 */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

.faq-item[open] {
  border-color: rgba(59, 130, 246, 0.4);
  background: var(--bg-card-hover);
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-question::after {
  content: "+";
  font-size: 1.4rem;
  color: var(--accent-cyan);
  font-weight: 400;
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-question::after {
  content: "−";
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 22px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* 页脚 (Footer) */
.site-footer {
  background: #070a10;
  border-top: 1px solid var(--border-color);
  padding: 50px 0 35px;
}

.footer-nav-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  margin-bottom: 30px;
  padding-bottom: 26px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-nav-link {
  font-size: 1.05rem;
  font-weight: 600;
  color: #e2e8f0;
  transition: var(--transition);
  position: relative;
  padding: 4px 0;
}

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

/* 页脚版权与 PBN 外链 (显色高亮，居中排版) */
.footer-pbn-bar {
  text-align: center;
  padding-top: 10px;
}

.footer-copyright {
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 14px;
}

.footer-friend-links {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--text-dim);
}

.pbn-link {
  color: #38bdf8 !important; /* 显色处理 */
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: var(--transition);
}

.pbn-link:hover {
  color: #67e8f9 !important;
  text-shadow: 0 0 8px rgba(56, 189, 248, 0.6);
}

.link-divider {
  color: rgba(255, 255, 255, 0.15);
}

/* 子页面独立通用样式 (文章内页、法律条款、关于我们等) */
.page-header-simple {
  padding: 60px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: rgba(17, 24, 39, 0.3);
}

.article-detail-body {
  max-width: 860px;
  margin: 50px auto 80px;
  padding: 0 20px;
  line-height: 1.85;
  font-size: 1.05rem;
  color: #cbd5e1;
}

.article-detail-body h2 {
  font-size: 1.7rem;
  color: #f8fafc;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.article-detail-body h3 {
  font-size: 1.3rem;
  color: #e2e8f0;
  margin: 28px 0 12px;
}

.article-detail-body p {
  margin-bottom: 20px;
}

.article-detail-body ul, .article-detail-body ol {
  margin-bottom: 24px;
  padding-left: 28px;
}

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

.article-detail-body a:not(.btn) {
  color: var(--accent-cyan);
  text-decoration: underline;
}

.article-detail-body a:not(.btn):hover {
  color: #67e8f9;
}

.article-detail-body .btn,
.article-detail-body a.btn {
  text-decoration: none !important;
}

.article-detail-body .btn-primary,
.article-detail-body a.btn-primary {
  color: #ffffff !important;
  text-decoration: none !important;
  font-weight: 700;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.article-callout {
  background: rgba(59, 130, 246, 0.1);
  border-left: 4px solid var(--primary-light);
  padding: 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 30px 0;
}

/* 响应式移动端优先 (Mobile Responsive) */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-card.featured {
    transform: none;
  }
  
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .media-ai-grid {
    grid-template-columns: 1fr;
  }
  
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.2rem;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  .nav-menu {
    display: none; /* 移动端精简，保留主视觉与直达CTA */
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  
  .articles-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-nav-bar {
    flex-direction: column;
    gap: 16px;
  }
  
  .hero-cta-group {
    flex-direction: column;
  }
  
  .btn-lg {
    width: 100%;
  }
}