/* ==========================================================================
   YOU-TU (you-tu.cfd) - 官方极速落地页原生样式表
   零外部框架依赖 · 原生极速 CSS3 · 极简秒开架构
   ========================================================================== */

/* 1. CSS 变量设计系统 (Dark Cyber & Neon Coral 风格) */
:root {
  --bg-primary: #070a12;
  --bg-secondary: #0d1322;
  --bg-tertiary: #131c31;
  --bg-card: rgba(19, 28, 49, 0.72);
  --bg-card-hover: rgba(26, 38, 66, 0.88);
  --bg-glass: rgba(255, 255, 255, 0.035);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(255, 0, 85, 0.35);
  --border-cyan: rgba(0, 229, 255, 0.3);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-white: #ffffff;

  --primary: #ff0055;
  --primary-light: #ff3377;
  --ice-yellow: #ffea00;
  --ice-yellow-light: #fff275;
  --primary-gradient: linear-gradient(135deg, #ff0055 0%, #ff2a6d 35%, #ffea00 80%, #fff275 100%);
  --accent-cyan: #00e5ff;
  --cyan-gradient: linear-gradient(135deg, #00e5ff 0%, #3b82f6 100%);
  --accent-purple: #a855f7;
  --accent-green: #10b981;
  --accent-amber: #f59e0b;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 35px rgba(255, 0, 85, 0.28);
  --shadow-cyan: 0 0 35px rgba(0, 229, 255, 0.25);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --container-max: 1240px;
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 2. 全局重置与排版规范 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text-main);
  background-color: var(--bg-primary);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--bg-primary);
}

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

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

ul, ol {
  list-style: none;
}

button, input {
  font-family: inherit;
}

/* 3. 动态背景层 (动态 Canvas 粒子 + 纯 CSS 漂浮流光光晕) */
.bg-canvas-wrap {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

#bgCanvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.85;
}

.ambient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.38;
  pointer-events: none;
  animation-duration: 20s;
  animation-iteration-count: infinite;
  animation-timing-function: ease-in-out;
}

.orb-1 {
  top: -10%;
  left: 15%;
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, #ff0055 0%, rgba(255, 0, 85, 0) 70%);
  animation-name: floatOrb1;
}

.orb-2 {
  top: 35%;
  right: -8%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #00e5ff 0%, rgba(0, 229, 255, 0) 70%);
  animation-name: floatOrb2;
  animation-duration: 24s;
}

.orb-3 {
  bottom: 10%;
  left: 5%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #7928ca 0%, rgba(121, 40, 202, 0) 70%);
  animation-name: floatOrb3;
  animation-duration: 28s;
}

@keyframes floatOrb1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(60px, 40px) scale(1.15); }
}

@keyframes floatOrb2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-70px, -50px) scale(0.9); }
}

@keyframes floatOrb3 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(50px, -60px) scale(1.1); }
}

/* 4. 容器与通用排版 */
.page-wrapper {
  position: relative;
  z-index: 1;
}

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

.section {
  padding-top: 90px;
  padding-bottom: 90px;
  position: relative;
}

.section-alt {
  background: linear-gradient(180deg, rgba(13, 19, 34, 0.4) 0%, rgba(19, 28, 49, 0.6) 50%, rgba(13, 19, 34, 0.4) 100%);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  text-align: center;
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 56px;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(255, 0, 85, 0.12);
  border: 1px solid rgba(255, 0, 85, 0.28);
  color: #ff3377;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.badge-cyan {
  background: rgba(0, 229, 255, 0.12);
  border-color: rgba(0, 229, 255, 0.3);
  color: #00e5ff;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.gradient-text {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.cyan-text {
  background: var(--cyan-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* 5. 按钮系统 (超醒目 CTA + 炫彩发光) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 28px;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
  white-space: nowrap;
  user-select: none;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
  box-shadow: 0 4px 18px rgba(255, 0, 85, 0.35), 0 0 14px rgba(255, 234, 0, 0.22);
}

.btn-primary:hover {
  transform: translateY(-2px);
  background: linear-gradient(135deg, #ff1a66 0%, #ff3b7a 35%, #fff033 80%, #fff9a6 100%);
  box-shadow: 0 8px 28px rgba(255, 0, 85, 0.5), 0 0 22px rgba(255, 234, 0, 0.35);
  color: #ffffff;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.07);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
  color: #ffffff;
}

.btn-cyan {
  background: var(--cyan-gradient);
  color: #070a12;
  font-weight: 800;
  box-shadow: 0 4px 18px rgba(0, 229, 255, 0.35);
}

.btn-cyan:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0, 229, 255, 0.55);
}

.btn-outline {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary-light);
  background: rgba(255, 0, 85, 0.08);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
  border-radius: var(--radius-lg);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.88rem;
  border-radius: var(--radius-sm);
}

.btn-block {
  width: 100%;
}

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

.btn-glow::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    60deg,
    transparent,
    rgba(255, 255, 255, 0.25),
    transparent
  );
  transform: rotate(30deg) translateX(-100%);
  transition: transform 0.75s ease;
}

.btn-glow:hover::after {
  transform: rotate(30deg) translateX(100%);
}

/* 6. 顶栏导航规范 (Header & Sticky Navigation) */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  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);
  transition: background var(--transition-base), border-color var(--transition-base);
}

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

.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  transition: transform var(--transition-fast);
}

.site-logo:hover {
  transform: scale(1.03);
}

.site-logo img, .site-logo-img {
  height: 44px;
  width: auto;
  border-radius: 8px;
  background-color: #ffffff;
  padding: 3px 8px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
  display: block;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  position: relative;
  padding: 6px 2px;
}

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

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

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

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

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  cursor: pointer;
  padding: 8px;
}

/* 7. Hero 首屏展示区 */
.hero-section {
  position: relative;
  padding-top: 80px;
  padding-bottom: 90px;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px;
  border-radius: var(--radius-full);
  background: rgba(255, 0, 85, 0.1);
  border: 1px solid rgba(255, 0, 85, 0.3);
  font-size: 0.9rem;
  font-weight: 700;
  color: #ff3377;
  margin-bottom: 28px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #10b981;
  box-shadow: 0 0 10px #10b981;
  animation: pulseGreen 1.8s infinite;
}

@keyframes pulseGreen {
  0% { transform: scale(0.9); opacity: 0.7; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.7; }
}

.hero-title {
  font-size: clamp(1.85rem, 2.85vw, 2.75rem);
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -0.5px;
  max-width: 1180px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 24px;
}

.hero-title-line2 {
  display: inline-block;
  margin-top: 6px;
}

.hero-subtitle {
  font-size: 1.25rem;
  line-height: 1.75;
  color: var(--text-muted);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 40px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-trust-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
  color: var(--text-dim);
  font-size: 0.92rem;
  font-weight: 600;
}

.trust-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.trust-item svg {
  color: #10b981;
}

/* 8. 实时数据与专线监控条 (Live Stats) */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 50px;
}

.stat-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 26px 20px;
  text-align: center;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.stat-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 0, 85, 0.4);
}

.stat-value {
  font-size: 2.3rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* 9. 核心优势特征网格 (Features Grid) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 34px 28px;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--primary-gradient);
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

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

.feature-icon-box {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: rgba(255, 0, 85, 0.12);
  border: 1px solid rgba(255, 0, 85, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-light);
  margin-bottom: 22px;
}

.feature-icon-cyan {
  background: rgba(0, 229, 255, 0.12);
  border-color: rgba(0, 229, 255, 0.25);
  color: var(--accent-cyan);
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 12px;
  line-height: 1.35;
}

.feature-desc {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.68;
}

/* 10. 专线节点测速与测延迟卡片 (Live Node Radar) */
.node-radar-wrap {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 36px 32px;
  box-shadow: var(--shadow-md);
}

.node-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.node-table {
  width: 100%;
  border-collapse: collapse;
}

.node-table th {
  text-align: left;
  font-size: 0.85rem;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 12px 14px;
  letter-spacing: 0.5px;
}

.node-table td {
  padding: 14px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.94rem;
}

.node-name-cell {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
}

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

.badge-tag {
  display: inline-block;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
}

.badge-iepl {
  background: rgba(255, 0, 85, 0.15);
  color: #ff3377;
  border: 1px solid rgba(255, 0, 85, 0.3);
}

.badge-isp {
  background: rgba(0, 229, 255, 0.15);
  color: #00e5ff;
  border: 1px solid rgba(0, 229, 255, 0.3);
}

.ping-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  font-family: monospace;
}

.ping-fast {
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
}

.speed-bar-wrap {
  width: 100%;
  max-width: 160px;
  height: 8px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.speed-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--primary-gradient);
}

/* 11. 价格板块规范 —— 必须所有价格同排 (All Prices In One Row) */
.pricing-section {
  position: relative;
}

.pricing-row-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr); /* 桌面端必须严格一字排开同排！ */
  gap: 22px;
  align-items: stretch; /* 确保所有卡片高度齐平 */
}

.pricing-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 34px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-base);
  position: relative;
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-lg);
}

/* 热门推荐卡片高亮 */
.pricing-card-featured {
  background: linear-gradient(180deg, rgba(255, 0, 85, 0.12) 0%, rgba(19, 28, 49, 0.85) 60%);
  border: 1.8px solid #ff0055;
  box-shadow: 0 0 35px rgba(255, 0, 85, 0.28);
}

.pricing-card-featured:hover {
  border-color: #ff3377;
  box-shadow: 0 0 45px rgba(255, 0, 85, 0.45);
}

.pricing-badge-popular {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-gradient);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 12px rgba(255, 0, 85, 0.4);
  white-space: nowrap;
}

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

.pricing-tier-name {
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.pricing-tier-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.45;
  min-height: 40px;
}

.pricing-price-box {
  text-align: center;
  padding: 18px 0;
  margin-bottom: 24px;
  background: rgba(255, 255, 255, 0.025);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.pricing-currency {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary-light);
  vertical-align: top;
  margin-right: 2px;
}

.pricing-amount {
  font-size: 3.1rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -1px;
}

.pricing-period {
  font-size: 0.9rem;
  color: var(--text-dim);
  font-weight: 600;
}

.pricing-monthly-calc {
  font-size: 0.82rem;
  color: #10b981;
  font-weight: 700;
  margin-top: 6px;
}

.pricing-features-list {
  margin-bottom: 30px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.pricing-feature-item svg {
  flex-shrink: 0;
  color: #10b981;
}

.pricing-cta-wrap {
  margin-top: auto;
}

/* 12. 客户端支持与一键导入教程 (Clients) */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.client-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  transition: all var(--transition-base);
}

.client-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 229, 255, 0.35);
  box-shadow: var(--shadow-cyan);
}

.client-icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  color: var(--accent-cyan);
}

.client-name {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 6px;
}

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

/* 13. 文章博客精选卡片 (Articles / Blog Grid) */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.article-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 26px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-base);
  text-decoration: none;
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 0, 85, 0.35);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.5);
}

.article-card-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  background: rgba(255, 0, 85, 0.12);
  color: #ff3377;
  font-size: 0.78rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.article-card-title {
  font-size: 1.18rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 12px;
  color: var(--text-white);
  transition: color var(--transition-fast);
}

.article-card:hover .article-card-title {
  color: #ff3377;
}

.article-card-snippet {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

.article-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-dim);
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
}

.read-more-link {
  color: #ff3377;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* 14. 用户评价模块规范 (User Reviews / Testimonials) */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.18);
}

.review-stars {
  display: flex;
  gap: 4px;
  color: #f59e0b;
  margin-bottom: 16px;
  font-size: 1.1rem;
}

.review-content {
  font-size: 0.94rem;
  color: var(--text-main);
  line-height: 1.68;
  margin-bottom: 22px;
  font-style: italic;
}

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

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #ffffff;
  font-size: 1.05rem;
}

.review-user-name {
  font-size: 0.95rem;
  font-weight: 700;
}

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

.verified-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: #10b981;
  font-size: 0.75rem;
  font-weight: 600;
}

/* 15. FAQ 折叠面板 (Native Vanilla FAQ Accordion) */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item.active {
  border-color: rgba(255, 0, 85, 0.35);
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  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;
  gap: 16px;
}

.faq-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  color: var(--text-dim);
  transition: transform var(--transition-base), color var(--transition-base);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: var(--primary-light);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.32s cubic-bezier(0.4, 0, 0.2, 1), padding 0.32s ease;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding-bottom: 22px;
}

/* 16. 友情链接 / 行业外链 (External Links) */
.links-section {
  padding-top: 40px;
  padding-bottom: 40px;
  border-top: 1px solid var(--border-subtle);
  background: rgba(10, 14, 26, 0.5);
}

.links-grid {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-top: 16px;
}

.link-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.link-pill:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(0, 229, 255, 0.3);
  color: var(--text-white);
  transform: translateY(-2px);
}

/* 17. 页脚规范 (Footer) */
.site-footer {
  background: #050810;
  border-top: 1px solid var(--border-subtle);
  padding-top: 70px;
  padding-bottom: 40px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand p {
  margin-top: 16px;
  font-size: 0.9rem;
  line-height: 1.68;
  max-width: 320px;
}

.footer-col-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 18px;
}

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

.footer-link {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 30px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 16px;
}

/* 18. 响应式适配 (Media Queries) */
@media (max-width: 1140px) {
  .pricing-row-container {
    grid-template-columns: repeat(2, 1fr); /* 平板尺寸自适应 2x2 */
  }
  .features-grid, .articles-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-grid, .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .section {
    padding-top: 60px;
    padding-bottom: 60px;
  }
  .site-nav {
    display: none;
    position: absolute;
    top: 74px;
    left: 0;
    width: 100%;
    background: rgba(7, 10, 18, 0.96);
    backdrop-filter: blur(18px);
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid var(--border-subtle);
    gap: 18px;
  }
  .site-nav.open {
    display: flex;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-title {
    font-size: 2.35rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .pricing-row-container {
    grid-template-columns: 1fr; /* 手机端单列纵览 */
  }
  .features-grid, .articles-grid, .reviews-grid, .stats-grid, .clients-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}