/* ========================================================
   天航机场网 (tianhang.homes) 官方落地页 原生纯净 CSS
   秒开级别极致性能 / 纯原生 CSS3 / 硬件加速渲染 / 响应式全适配
   ======================================================== */

:root {
  --bg-primary: #040813;
  --bg-secondary: #081329;
  --bg-card: rgba(11, 23, 46, 0.75);
  --bg-card-hover: rgba(16, 33, 66, 0.9);
  --border-color: rgba(52, 211, 153, 0.22);
  --border-hover: rgba(52, 211, 153, 0.65);
  
  --primary: #34d399;
  --primary-hover: #6ee7b7;
  --secondary: #10b981;
  --accent-cyan: #34d399;
  --accent-blue: #059669;
  --accent-purple: #8b5cf6;
  --accent-green: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 30px rgba(52, 211, 153, 0.3);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.6);
  --shadow-popular: 0 0 35px rgba(52, 211, 153, 0.35);
  
  --container-max: 1260px;
  --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::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 {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* ================= 动态背景与星轨流光 ================= */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

.dynamic-ambient {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
  overflow: hidden;
  pointer-events: none;
}

.ambient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.35;
  will-change: transform;
}

.orb-1 {
  top: -10%;
  left: 15%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #0284c7 0%, rgba(2, 132, 199, 0) 70%);
  animation: floatOrb1 16s ease-in-out infinite alternate;
}

.orb-2 {
  top: 40%;
  right: -10%;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, #4f46e5 0%, rgba(79, 70, 229, 0) 70%);
  animation: floatOrb2 22s ease-in-out infinite alternate;
}

.orb-3 {
  bottom: -15%;
  left: 30%;
  width: 650px;
  height: 650px;
  background: radial-gradient(circle, #34d399 0%, rgba(52, 211, 153, 0) 70%);
  animation: floatOrb3 18s ease-in-out infinite alternate;
}

.grid-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: linear-gradient(to right, rgba(52, 211, 153, 0.035) 1px, transparent 1px),
                    linear-gradient(to bottom, rgba(52, 211, 153, 0.035) 1px, transparent 1px);
  background-size: 50px 50px;
  z-index: -1;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 40%, #000 60%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 40%, #000 60%, transparent 100%);
}

@keyframes floatOrb1 {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(80px, 60px) scale(1.15); }
}
@keyframes floatOrb2 {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(-90px, -80px) scale(1.1); }
}
@keyframes floatOrb3 {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(60px, -70px) scale(1.2); }
}

/* ================= 布局容器 ================= */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ================= 导航条 (Header) ================= */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(4, 8, 19, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(52, 211, 153, 0.15);
  transition: var(--transition);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.header-brand {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.header-brand img {
  height: 48px;
  width: auto;
  display: block;
}

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

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
  padding: 6px 2px;
}

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

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

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

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

/* ================= 按钮规范 ================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #a7f3d0 0%, #6ee7b7 45%, #10b981 100%);
  color: #022c22;
  box-shadow: 0 4px 18px rgba(52, 211, 153, 0.45), 0 0 16px rgba(110, 231, 183, 0.35);
  font-weight: 700;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 26px rgba(52, 211, 153, 0.68), 0 0 25px rgba(110, 231, 183, 0.55);
  filter: brightness(1.06);
  color: #022c22;
}

.btn-outline {
  background: rgba(52, 211, 153, 0.08);
  color: var(--text-main);
  border-color: rgba(52, 211, 153, 0.3);
}

.btn-outline:hover {
  background: rgba(52, 211, 153, 0.18);
  border-color: var(--primary);
  color: var(--primary-hover);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 7px 16px;
  font-size: 0.88rem;
}

.btn-lg {
  padding: 14px 34px;
  font-size: 1.05rem;
}

.btn-block {
  width: 100%;
}

/* ================= 英雄区 (Hero) ================= */
.hero-section {
  padding-top: 140px;
  padding-bottom: 70px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 18px;
  background: rgba(52, 211, 153, 0.1);
  border: 1px solid rgba(52, 211, 153, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  color: #6ee7b7;
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
}

.pill-dot {
  width: 8px;
  height: 8px;
  background: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 10px #10b981;
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.hero-title {
  font-size: clamp(2.3rem, 5.2vw, 3.8rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 22px;
  letter-spacing: -0.02em;
}

.text-gradient {
  background: linear-gradient(135deg, #f0fdf4 10%, #a7f3d0 45%, #6ee7b7 75%, #34d399 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  max-width: 840px;
  margin: 0 auto 34px;
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.75;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 45px;
}

.hero-guarantee {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
  color: var(--text-dim);
  font-size: 0.9rem;
}

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

.guarantee-item svg {
  color: var(--primary);
}

/* ================= 核心数据展板 ================= */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin: 50px 0 20px;
  padding: 24px 30px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
}

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

.stat-value {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.2;
  margin-bottom: 4px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.stat-value span {
  color: var(--primary);
  font-size: 1.4rem;
}

.stat-label {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* ================= 节点测速实时面板 ================= */
.section {
  padding: 80px 0;
  position: relative;
}

.section-head {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--primary);
  background: rgba(52, 211, 153, 0.12);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
  border: 1px solid rgba(52, 211, 153, 0.3);
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 14px;
}

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

.node-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}

.node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  backdrop-filter: blur(10px);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.node-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.node-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.node-country {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
}

.node-flag {
  font-size: 1.5rem;
  line-height: 1;
}

.node-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.node-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--text-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 12px;
  margin-top: 10px;
}

.node-latency {
  color: #10b981;
  font-weight: 700;
}

/* ================= 核心价格区 (所有价格严格同排) ================= */
.pricing-section {
  padding: 90px 0;
  background: linear-gradient(180deg, transparent 0%, rgba(8, 19, 41, 0.6) 50%, transparent 100%);
  position: relative;
}

.pricing-table-wrapper {
  width: 100%;
  overflow-x: auto;
  padding-bottom: 10px;
  -webkit-overflow-scrolling: touch;
}

/* 核心要求：所有价格同排 (4列严格并列) */
.pricing-row-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  min-width: 1020px; /* 确保桌面及横向滚动时同排对齐不挤压 */
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  backdrop-filter: blur(14px);
  position: relative;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.pricing-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: var(--shadow-card), 0 0 25px rgba(52, 211, 153, 0.25);
}

.pricing-card.popular {
  background: linear-gradient(180deg, rgba(16, 36, 75, 0.85) 0%, rgba(10, 23, 50, 0.85) 100%);
  border: 1.5px solid var(--primary);
  box-shadow: var(--shadow-popular);
  transform: scale(1.02);
}

.pricing-card.popular:hover {
  transform: scale(1.03) translateY(-4px);
}

.popular-badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #a7f3d0 0%, #6ee7b7 45%, #10b981 100%);
  color: #022c22;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 1px;
  box-shadow: 0 4px 14px rgba(52, 211, 153, 0.45);
}

.plan-header {
  text-align: center;
  padding-bottom: 22px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 24px;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 6px;
  color: var(--text-main);
}

.plan-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-height: 22px;
}

.plan-price-wrap {
  margin: 18px 0 10px;
  display: flex;
  align-items: baseline;
  justify-content: center;
}

.currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--primary);
  margin-right: 2px;
}

.price-num {
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.price-cycle {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-left: 4px;
}

.plan-discount-tag {
  display: inline-block;
  font-size: 0.76rem;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.plan-features {
  list-style: none;
  margin-bottom: 28px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  line-height: 1.5;
}

.plan-feature-item.highlight {
  color: #e2e8f0;
  font-weight: 600;
}

.plan-feature-item svg {
  flex-shrink: 0;
  width: 17px;
  height: 17px;
  color: #10b981;
  margin-top: 2px;
}

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

.feature-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  backdrop-filter: blur(12px);
  transition: var(--transition);
}

.feature-box:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card), 0 0 20px rgba(52, 211, 153, 0.22);
}

.feature-icon-wrap {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: rgba(52, 211, 153, 0.12);
  border: 1px solid rgba(52, 211, 153, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--primary);
}

.feature-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-text {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ================= 全平台客户端支持 ================= */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.client-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px 18px;
  text-align: center;
  transition: var(--transition);
}

.client-item:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

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

.client-name {
  font-size: 1.02rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.client-support {
  font-size: 0.78rem;
  color: var(--primary);
  font-weight: 500;
}

/* ================= 知识库 / 文章推荐区 (8篇文章聚合) ================= */
.articles-section {
  padding: 90px 0;
  position: relative;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, #6ee7b7, #10b981);
  opacity: 0;
  transition: var(--transition);
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-card), 0 0 25px rgba(52, 211, 153, 0.3);
}

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

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  font-size: 0.78rem;
  color: var(--text-dim);
}

.article-tag {
  background: rgba(52, 211, 153, 0.15);
  color: var(--primary);
  border: 1px solid rgba(52, 211, 153, 0.28);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.article-title {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 12px;
  color: var(--text-main);
  transition: color 0.2s ease;
}

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

.article-excerpt {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--primary);
  font-weight: 600;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 12px;
}

/* ================= 用户真实评价 (User Reviews) ================= */
.reviews-section {
  padding: 80px 0;
  background: rgba(6, 14, 30, 0.5);
  position: relative;
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(12px);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

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

.review-stars {
  color: #fbbf24;
  margin-bottom: 12px;
  font-size: 1rem;
  display: flex;
  gap: 2px;
}

.review-content {
  font-size: 0.94rem;
  color: #cbd5e1;
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 14px;
}

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #00f2fe 0%, #6366f1 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  color: #040813;
  flex-shrink: 0;
}

.user-info {
  flex-grow: 1;
}

.user-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 6px;
}

.verified-badge {
  font-size: 0.7rem;
  color: #10b981;
  background: rgba(16, 185, 129, 0.15);
  padding: 1px 6px;
  border-radius: 4px;
  font-weight: 600;
}

.user-role {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ================= 常见问题 FAQ ================= */
.faq-section {
  padding: 90px 0;
  position: relative;
}

.faq-container {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--border-hover);
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

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

.faq-icon {
  width: 20px;
  height: 20px;
  color: var(--primary);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.faq-item[open] .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 22px;
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.75;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 16px;
}

/* ================= 底部行动号召 (Bottom CTA) ================= */
.cta-banner {
  margin: 60px 0 20px;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.22) 0%, rgba(139, 92, 246, 0.18) 100%),
              rgba(11, 23, 46, 0.9);
  border: 1.5px solid rgba(52, 211, 153, 0.35);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 40px rgba(52, 211, 153, 0.2);
}

.cta-banner h2 {
  font-size: clamp(1.8rem, 3.8vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-banner p {
  max-width: 680px;
  margin: 0 auto 30px;
  font-size: 1.08rem;
  color: #cbd5e1;
}

/* ================= 友情链接与权威外链 ================= */
.external-links-section {
  padding: 40px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.links-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.links-flex {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
}

.ext-link {
  font-size: 0.85rem;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s ease;
}

.ext-link:hover {
  color: var(--primary);
}

/* ================= 网页页脚 (Footer) ================= */
.site-footer {
  background: #02060f;
  border-top: 1px solid rgba(52, 211, 153, 0.15);
  padding: 60px 0 30px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 45px;
}

.footer-brand-desc {
  margin-top: 14px;
  font-size: 0.88rem;
  line-height: 1.7;
  max-width: 340px;
  color: var(--text-dim);
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 25px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 15px;
  font-size: 0.82rem;
  color: var(--text-dim);
}

.footer-geo-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.05);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

/* ================= 响应式媒体查询 ================= */
@media (max-width: 1100px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .stats-strip {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none; /* 移动端可精简或通过锚点快速浏览 */
  }
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .cta-banner {
    padding: 40px 20px;
  }
}