/* ==========================================================================
   kendeji.click - 肯德基机场网 核心原生样式表 (Pure Native CSS)
   秒开级极速架构 · 无第三方依赖 · 现代暗黑科技风 (Cyber Dark Modern)
   ========================================================================== */

:root {
  --bg-main: #070a12;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(24, 33, 53, 0.85);
  --bg-card-border: rgba(255, 255, 255, 0.08);
  --bg-card-border-hover: rgba(139, 92, 246, 0.4);
  
  --primary: #8b5cf6;
  --primary-glow: rgba(139, 92, 246, 0.35);
  --secondary: #6366f1;
  --accent-cyan: #00e5ff;
  --accent-cyan-glow: rgba(0, 229, 255, 0.25);
  --accent-green: #10b981;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-sub: #cbd5e1;
  --border-subtle: rgba(255, 255, 255, 0.08);
  
  --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;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --container-max: 1240px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

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

ul, ol {
  list-style: none;
}

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

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

/* ==========================================================================
   动态背景 Canvas 与 Ambient Glow 光效
   ========================================================================== */
#dynamic-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.bg-ambient-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.18;
}

.ambient-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #8b5cf6 0%, transparent 70%);
  top: -150px;
  left: -100px;
  animation: ambientFloat1 18s ease-in-out infinite alternate;
}

.ambient-2 {
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, #00e5ff 0%, transparent 70%);
  bottom: 10%;
  right: -100px;
  animation: ambientFloat2 20s ease-in-out infinite alternate;
}

.ambient-3 {
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, #6366f1 0%, transparent 70%);
  top: 45%;
  left: 30%;
  animation: ambientFloat3 22s ease-in-out infinite alternate;
}

@keyframes ambientFloat1 {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(80px, 120px) scale(1.15); }
}
@keyframes ambientFloat2 {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(-100px, -80px) scale(1.1); }
}
@keyframes ambientFloat3 {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(50px, -90px) scale(0.9); }
}

/* 页面内容在动态背景之上 */
header, main, footer, section {
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   顶部导航栏 Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 10, 18, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  height: 72px;
  display: flex;
  align-items: center;
}

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

.site-logo {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-logo img {
  height: 42px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-sub);
  position: relative;
  padding: 6px 0;
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transition: width 0.25s ease;
  border-radius: 2px;
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

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

.btn-nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, #a855f7 0%, #8b5cf6 50%, #6366f1 100%);
  color: #ffffff;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 9px 20px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 16px rgba(139, 92, 246, 0.45);
  transition: var(--transition);
}

.btn-nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(139, 92, 246, 0.65);
}

/* 移动端汉堡按钮 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  cursor: pointer;
  padding: 8px;
}

/* ==========================================================================
   Hero 主屏区域
   ========================================================================== */
.hero-section {
  padding: 70px 0 60px;
  text-align: center;
}

.hero-badge-wrap {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.35);
  margin-bottom: 24px;
}

.badge-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--primary);
  box-shadow: 0 0 10px var(--primary);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0% { transform: scale(0.95); opacity: 0.7; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.7; }
}

.badge-text {
  font-size: 0.88rem;
  font-weight: 600;
  color: #c4b5fd;
  letter-spacing: 0.5px;
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 22px;
  letter-spacing: -0.5px;
}

.gradient-text {
  background: linear-gradient(135deg, #d946ef 0%, #a855f7 35%, #8b5cf6 65%, #00e5ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  max-width: 840px;
  margin: 0 auto 36px;
  font-size: 1.15rem;
  line-height: 1.8;
  color: var(--text-sub);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.btn-cta-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, #a855f7 0%, #8b5cf6 50%, #6366f1 100%);
  color: #ffffff;
  font-size: 1.1rem;
  font-weight: 700;
  padding: 16px 36px;
  border-radius: var(--radius-full);
  box-shadow: 0 8px 30px rgba(139, 92, 246, 0.45);
  transition: var(--transition);
}

.btn-cta-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 38px rgba(139, 92, 246, 0.7);
}

.btn-cta-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.06);
  color: #ffffff;
  font-size: 1.05rem;
  font-weight: 600;
  padding: 15px 32px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  transition: var(--transition);
}

.btn-cta-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

/* 实时监控数据条 (Hero Metrics) */
.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 980px;
  margin: 0 auto;
  padding: 24px 28px;
  background: rgba(17, 24, 39, 0.7);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
}

.metric-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.metric-item:last-child {
  border-right: none;
}

.metric-value {
  font-size: 2rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: #ffffff;
  display: flex;
  align-items: baseline;
  gap: 2px;
}

.metric-value .unit {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

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

/* ==========================================================================
   通用的 Section 头部样式
   ========================================================================== */
.section-wrap {
  padding: 85px 0;
}

.section-header {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--primary);
  background: rgba(139, 92, 246, 0.12);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
  border: 1px solid rgba(139, 92, 246, 0.28);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 14px;
  color: #ffffff;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
}

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

.feature-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

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

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--bg-card-border-hover);
  background: var(--bg-card-hover);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4);
}

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

.feature-icon-box {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(99, 102, 241, 0.15));
  border: 1px solid rgba(139, 92, 246, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin-bottom: 20px;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #ffffff;
}

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

/* ==========================================================================
   套餐价格区 (Pricing Section)
   【核心规范：所有价格要同排对齐！CTA 严格 rel="nofollow" target="_blank"】
   ========================================================================== */
.pricing-section {
  padding: 85px 0;
  background: linear-gradient(180deg, transparent 0%, rgba(17, 24, 39, 0.45) 50%, transparent 100%);
}

.pricing-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-lg);
  padding: 30px 24px 28px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: rgba(139, 92, 246, 0.45);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

/* 热门推荐卡片高亮 */
.pricing-card.featured {
  background: linear-gradient(180deg, rgba(31, 41, 65, 0.85) 0%, rgba(17, 24, 39, 0.9) 100%);
  border: 2px solid #8b5cf6;
  box-shadow: 0 16px 40px rgba(139, 92, 246, 0.28);
  transform: scale(1.03);
  z-index: 2;
}

.pricing-card.featured:hover {
  transform: scale(1.04) translateY(-8px);
  box-shadow: 0 24px 50px rgba(139, 92, 246, 0.45);
}

.featured-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #a855f7, #6366f1);
  color: #ffffff;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
  white-space: nowrap;
}

.pricing-header {
  margin-bottom: 20px;
  text-align: center;
}

.plan-name {
  font-size: 1.4rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-height: 42px;
  line-height: 1.5;
}

.pricing-price-wrap {
  text-align: center;
  padding: 16px 0;
  border-top: 1px dashed rgba(255, 255, 255, 0.1);
  border-bottom: 1px dashed rgba(255, 255, 255, 0.1);
  margin-bottom: 22px;
}

.price-currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--primary);
  vertical-align: top;
  position: relative;
  top: 6px;
}

.price-value {
  font-size: 3rem;
  font-weight: 900;
  font-family: var(--font-mono);
  color: #ffffff;
  line-height: 1;
}

.price-cycle {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-left: 4px;
}

.price-sub-calc {
  font-size: 0.8rem;
  color: var(--accent-cyan);
  margin-top: 4px;
  font-weight: 500;
}

.pricing-features {
  flex-grow: 1;
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-sub);
  line-height: 1.45;
}

.pricing-feature-item .icon-check {
  color: var(--accent-green);
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.pricing-feature-item strong {
  color: #ffffff;
}

/* CTA 购买按钮规范 */
.btn-plan-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 13px 20px;
  font-size: 0.98rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  transition: var(--transition);
  text-align: center;
}

.btn-plan-featured {
  background: linear-gradient(135deg, #a855f7 0%, #8b5cf6 50%, #6366f1 100%);
  color: #ffffff;
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
}

.btn-plan-featured:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(139, 92, 246, 0.65);
}

.btn-plan-outline {
  background: rgba(255, 255, 255, 0.05);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-plan-outline:hover {
  background: rgba(139, 92, 246, 0.15);
  border-color: var(--primary);
  color: #ffffff;
  transform: translateY(-2px);
}

/* ==========================================================================
   全球节点与实时延迟分布 (Nodes Status)
   ========================================================================== */
.nodes-table-wrap {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
}

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

.nodes-table th, .nodes-table td {
  padding: 16px 24px;
}

.nodes-table th {
  background: rgba(11, 15, 25, 0.9);
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  border-bottom: 1px solid var(--border-subtle);
}

.nodes-table td {
  font-size: 0.92rem;
  color: var(--text-sub);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.nodes-table tr:hover td {
  background: rgba(255, 255, 255, 0.03);
}

.node-region-cell {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  color: #ffffff;
}

.flag-icon {
  font-size: 1.3rem;
}

.status-badge-ok {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-green);
  background: rgba(16, 185, 129, 0.1);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.status-dot-green {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-green);
  box-shadow: 0 0 6px var(--accent-green);
}

.latency-value {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-cyan);
}

/* ==========================================================================
   客户端生态与支持 (Clients)
   ========================================================================== */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
}

.client-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-md);
  padding: 22px 16px;
  text-align: center;
  transition: var(--transition);
}

.client-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 229, 255, 0.4);
  background: var(--bg-card-hover);
}

.client-icon {
  font-size: 2.2rem;
  margin-bottom: 10px;
}

.client-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 4px;
}

.client-os {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ==========================================================================
   评测与 SEO 文章专栏 (Articles Grid)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.article-card:hover {
  transform: translateY(-6px);
  border-color: rgba(139, 92, 246, 0.4);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4);
}

.article-thumb-banner {
  height: 140px;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.15) 0%, rgba(0, 229, 255, 0.1) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.thumb-tag {
  position: absolute;
  top: 14px;
  left: 16px;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(11, 15, 25, 0.85);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 229, 255, 0.3);
}

.thumb-icon {
  font-size: 3rem;
  opacity: 0.85;
}

.article-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

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

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.5;
  margin-bottom: 10px;
}

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

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-footer-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary);
}

.article-footer-link:hover {
  color: var(--secondary);
  gap: 10px;
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: rgba(139, 92, 246, 0.35);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.3);
}

.review-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

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

.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #a855f7, #6366f1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 1.1rem;
}

.reviewer-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
}

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

.review-stars {
  color: #ffb703;
  font-size: 0.95rem;
  letter-spacing: 1px;
}

.review-content {
  font-size: 0.92rem;
  color: var(--text-sub);
  line-height: 1.65;
  margin-bottom: 16px;
  flex-grow: 1;
}

.review-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 12px;
}

.verified-tag {
  color: var(--accent-green);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ==========================================================================
   常见问题 FAQ (Accordion)
   ========================================================================== */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

.faq-item:hover {
  border-color: rgba(255, 255, 255, 0.16);
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  text-align: left;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: var(--transition);
}

.faq-icon-arrow {
  font-size: 1.1rem;
  color: var(--primary);
  transition: transform 0.25s ease;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1), padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 600px;
  padding: 0 24px 22px;
  transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
}

/* ==========================================================================
   外链与权威参考资源 (External Links / Backlinks)
   ========================================================================== */
.links-section {
  padding: 60px 0 40px;
  border-top: 1px solid var(--border-subtle);
  background: rgba(11, 15, 25, 0.4);
}

.links-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.link-block {
  background: rgba(17, 24, 39, 0.5);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: var(--transition);
}

.link-block:hover {
  border-color: rgba(0, 229, 255, 0.4);
  transform: translateY(-2px);
}

.link-block h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.link-block p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.link-block a {
  color: var(--accent-cyan);
  word-break: break-all;
}

.link-block a:hover {
  text-decoration: underline;
}

/* ==========================================================================
   页尾 Footer
   ========================================================================== */
.site-footer {
  background: #05080e;
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 30px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-top: 14px;
  max-width: 360px;
}

.footer-column h4 {
  font-size: 0.98rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 18px;
}

.footer-column ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-column a {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-column a:hover {
  color: #ffffff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.geo-meta {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* ==========================================================================
   响应式断点 (Responsive Queries)
   保证桌面端所有价格严格同排，移动端优雅自适应
   ========================================================================== */
@media (max-width: 1100px) {
  .pricing-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-8px);
  }
  .clients-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 900px) {
  .hero-title {
    font-size: 2.3rem;
  }
  .features-grid, .articles-grid, .reviews-grid, .links-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-metrics {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .metric-item:nth-child(2) {
    border-right: none;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
}

@media (max-width: 680px) {
  .site-header {
    height: 64px;
  }
  .nav-menu {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
  .nav-menu.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    width: 100%;
    background: rgba(7, 10, 18, 0.98);
    border-bottom: 1px solid var(--border-subtle);
    padding: 20px;
    gap: 16px;
  }
  .hero-title {
    font-size: 1.85rem;
  }
  .hero-description {
    font-size: 1rem;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .btn-cta-primary, .btn-cta-secondary {
    width: 100%;
    justify-content: center;
  }
  .pricing-row {
    grid-template-columns: 1fr;
  }
  .features-grid, .articles-grid, .reviews-grid, .links-grid, .clients-grid {
    grid-template-columns: 1fr;
  }
  .hero-metrics {
    grid-template-columns: 1fr 1fr;
    padding: 16px;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}