/* ==========================================================================
   五树云 WushuCloud 官方网站核心样式表 (wushucloud.shop)
   特性：100% 纯原生 CSS，零重型框架，秒级瞬时加载，动态背景动画，全价格同排展示
   ========================================================================== */

/* -------------------- 1. CSS 变量与设计系统 -------------------- */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* 主题色彩：深邃星空与生机翡翠、电光青与淡冰紫的融合 */
  --bg-main: #060b13;
  --bg-card: rgba(13, 22, 38, 0.72);
  --bg-card-hover: rgba(19, 32, 54, 0.88);
  --bg-glass: rgba(255, 255, 255, 0.04);
  
  --primary: #10b981;        /* 翡翠绿 - 象征五树生机与安全 */
  --primary-glow: rgba(16, 185, 129, 0.35);
  --ice-purple: #c4b5fd;     /* 淡冰紫 - 柔和清透冰爽科技感 */
  --ice-purple-glow: rgba(186, 155, 255, 0.45);
  --secondary: #06b6d4;      /* 极速青 - 象征千兆低延迟与国际专线 */
  --secondary-glow: rgba(6, 182, 212, 0.35);
  --accent: #3b82f6;         /* 商务蓝 - 稳定与专业 */
  --accent-amber: #f59e0b;   /* 琥珀金 - 热门与尊享 */
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-sub: #cbd5e1;
  --border-light: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(16, 185, 129, 0.35);
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.55);
  --shadow-glow: 0 0 28px rgba(16, 185, 129, 0.25);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* -------------------- 2. 全局重置与基础样式 -------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  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%;
}

button, input {
  font-family: inherit;
  border: none;
  outline: none;
  background: none;
}

/* 容器布局 */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* -------------------- 3. 动态背景 (Dynamic Animated Background) -------------------- */
.dynamic-background-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -10;
  overflow: hidden;
  pointer-events: none;
}

/* 4K 原生自然运镜层 (Cinematic Ken Burns Effect - 普罗旺斯薰衣草花海) */
.dynamic-bg-media {
  position: absolute;
  top: -5%;
  left: -5%;
  width: 110%;
  height: 110%;
  background-image: url('assets/lavender.jpg');
  background-size: cover;
  background-position: center 58%;
  background-repeat: no-repeat;
  filter: saturate(1.28) brightness(0.88) contrast(1.08);
  animation: bgCinematicDrift 36s ease-in-out infinite alternate;
  will-change: transform;
}

@keyframes bgCinematicDrift {
  0% {
    transform: scale(1) translate3d(0, 0, 0);
  }
  50% {
    transform: scale(1.08) translate3d(-1.5%, 1.2%, 0);
  }
  100% {
    transform: scale(1.04) translate3d(1.8%, -1.2%, 0);
  }
}

/* 动态流动薰衣草紫光弥散层 (Ambient Glowing Lavender Aurora Mesh) */
.dynamic-aurora-mesh {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 20% 25%, rgba(196, 181, 253, 0.22) 0%, transparent 48%),
    radial-gradient(circle at 80% 30%, rgba(167, 139, 250, 0.2) 0%, transparent 52%),
    radial-gradient(circle at 45% 75%, rgba(192, 132, 252, 0.18) 0%, transparent 55%),
    radial-gradient(circle at 88% 85%, rgba(124, 58, 237, 0.16) 0%, transparent 45%);
  filter: blur(40px);
  animation: auroraMeshPulse 14s ease-in-out infinite alternate;
}

@keyframes auroraMeshPulse {
  0% {
    opacity: 0.75;
    transform: scale(1) rotate(0deg);
  }
  50% {
    opacity: 1;
    transform: scale(1.05) rotate(1.2deg);
  }
  100% {
    opacity: 0.85;
    transform: scale(0.98) rotate(-1.2deg);
  }
}

/* 半透明渐变遮罩：确保文字清晰可读，同时让背景绝美的紫色薰衣草花海清晰呈现 */
.dynamic-cyber-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    linear-gradient(180deg, rgba(6, 11, 19, 0.42) 0%, rgba(6, 11, 19, 0.55) 45%, rgba(6, 11, 19, 0.84) 100%),
    radial-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 100% 100%, 36px 36px;
}

/* 漂浮的动态薰衣草微光粒子 (CSS-Only Floating Energy Orbs) */
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(50px);
  opacity: 0.45;
  animation: orbFloating 20s infinite ease-in-out;
}
.orb-1 {
  width: 440px;
  height: 440px;
  background: rgba(167, 139, 250, 0.32);
  top: 15%;
  left: 10%;
  animation-duration: 22s;
}
.orb-2 {
  width: 400px;
  height: 400px;
  background: rgba(192, 132, 252, 0.28);
  top: 45%;
  right: 8%;
  animation-duration: 26s;
  animation-delay: -7s;
}
.orb-3 {
  width: 480px;
  height: 480px;
  background: rgba(124, 92, 235, 0.22);
  bottom: 10%;
  left: 30%;
  animation-duration: 30s;
  animation-delay: -12s;
}

/* -------------------- 薰衣草花瓣飘落动效系统 (高层级独立飘落层) -------------------- */
.lavender-falling-layer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 8; /* 独立层级：在背景上方通透飘洒，绝不被任何背景图层遮蔽，同时可穿透点击 */
  overflow: hidden;
}

.lavender-petal {
  position: absolute;
  background: linear-gradient(135deg, #ffffff 0%, #f3e8ff 22%, #c084fc 60%, #9333ea 100%);
  border-radius: 65% 0 65% 45%;
  pointer-events: none;
  filter: drop-shadow(0 2px 8px rgba(192, 132, 252, 0.9));
  will-change: transform;
}

/* 18 组全景多层次花瓣：尺寸各异、轨迹交错、负延迟即时满屏飘落 */
.petal-1  { left: 4%;  width: 14px; height: 22px; animation: petalFall-right 15s linear infinite; animation-delay: -2s; }
.petal-2  { left: 11%; width: 18px; height: 28px; animation: petalFall-sway  20s linear infinite; animation-delay: -11s; }
.petal-3  { left: 19%; width: 13px; height: 20px; animation: petalFall-left  17s linear infinite; animation-delay: -5s; }
.petal-4  { left: 26%; width: 20px; height: 32px; animation: petalFall-right 23s linear infinite; animation-delay: -14s; }
.petal-5  { left: 34%; width: 15px; height: 24px; animation: petalFall-sway  16s linear infinite; animation-delay: -8s; }
.petal-6  { left: 42%; width: 22px; height: 34px; animation: petalFall-left  21s linear infinite; animation-delay: -1s; }
.petal-7  { left: 49%; width: 16px; height: 25px; animation: petalFall-right 18s linear infinite; animation-delay: -13s; }
.petal-8  { left: 56%; width: 14px; height: 22px; animation: petalFall-sway  24s linear infinite; animation-delay: -6s; }
.petal-9  { left: 63%; width: 19px; height: 30px; animation: petalFall-left  15s linear infinite; animation-delay: -10s; }
.petal-10 { left: 70%; width: 12px; height: 19px; animation: petalFall-right 19s linear infinite; animation-delay: -3s; }
.petal-11 { left: 77%; width: 21px; height: 33px; animation: petalFall-sway  17s linear infinite; animation-delay: -15s; }
.petal-12 { left: 84%; width: 15px; height: 23px; animation: petalFall-left  22s linear infinite; animation-delay: -7s; }
.petal-13 { left: 91%; width: 18px; height: 29px; animation: petalFall-right 16s linear infinite; animation-delay: -12s; }
.petal-14 { left: 96%; width: 13px; height: 21px; animation: petalFall-sway  25s linear infinite; animation-delay: -17s; }
.petal-15 { left: 15%; width: 17px; height: 27px; animation: petalFall-left  19s linear infinite; animation-delay: -9s; }
.petal-16 { left: 52%; width: 15px; height: 24px; animation: petalFall-right 21s linear infinite; animation-delay: -16s; }
.petal-17 { left: 68%; width: 20px; height: 31px; animation: petalFall-sway  18s linear infinite; animation-delay: -4s; }
.petal-18 { left: 88%; width: 16px; height: 25px; animation: petalFall-left  20s linear infinite; animation-delay: -13s; }

/* 轨迹 1：随微风向右倾斜下落并旋转 */
@keyframes petalFall-right {
  0% {
    transform: translate3d(0, -40px, 0) rotate(0deg);
    opacity: 0;
  }
  6% {
    opacity: 0.95;
  }
  50% {
    transform: translate3d(90px, 52vh, 0) rotate(260deg);
    opacity: 1;
  }
  94% {
    opacity: 0.95;
  }
  100% {
    transform: translate3d(180px, 105vh, 0) rotate(540deg);
    opacity: 0;
  }
}

/* 轨迹 2：向左飘舞回旋下落 */
@keyframes petalFall-left {
  0% {
    transform: translate3d(0, -40px, 0) rotate(0deg);
    opacity: 0;
  }
  6% {
    opacity: 0.95;
  }
  50% {
    transform: translate3d(-80px, 50vh, 0) rotate(-240deg);
    opacity: 1;
  }
  94% {
    opacity: 0.95;
  }
  100% {
    transform: translate3d(-165px, 105vh, 0) rotate(-510deg);
    opacity: 0;
  }
}

/* 轨迹 3：左右随风S形摇曳翻转 */
@keyframes petalFall-sway {
  0% {
    transform: translate3d(0, -40px, 0) rotate(0deg);
    opacity: 0;
  }
  6% {
    opacity: 0.95;
  }
  30% {
    transform: translate3d(55px, 32vh, 0) rotate(130deg);
    opacity: 1;
  }
  65% {
    transform: translate3d(-45px, 70vh, 0) rotate(320deg);
    opacity: 1;
  }
  94% {
    opacity: 0.95;
  }
  100% {
    transform: translate3d(50px, 105vh, 0) rotate(500deg);
    opacity: 0;
  }
}

@keyframes orbFloating {
  0% { transform: translate3d(0, 0, 0); }
  50% { transform: translate3d(45px, -35px, 0); }
  100% { transform: translate3d(-30px, 40px, 0); }
}

/* -------------------- 4. 导航栏 (Navigation Header) -------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(6, 11, 19, 0.82);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition);
}

.site-nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

/* 左侧 Logo 品牌 */
.site-brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  z-index: 101;
}
.site-brand-link img {
  height: 46px;
  width: auto;
  transition: transform 0.3s ease;
}
.site-brand-link:hover img {
  transform: scale(1.03);
}

/* 桌面端导航链接 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-sub);
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* 移动端菜单切换按钮 */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 28px;
  height: 24px;
  cursor: pointer;
  z-index: 102;
}
.mobile-toggle span {
  width: 100%;
  height: 2.5px;
  background: var(--text-main);
  border-radius: 4px;
  transition: var(--transition);
}

/* -------------------- 5. 按钮规范 (严格满足 CTA 规范) -------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #e2d6ff 0%, #a78bfa 48%, #6d4fe6 100%);
  color: #ffffff;
  text-shadow: 0 1px 2px rgba(25, 10, 45, 0.35);
  box-shadow: 0 4px 20px rgba(186, 155, 255, 0.45);
}
.btn-primary:hover {
  background: linear-gradient(135deg, #d4c4fc 0%, #9676f8 48%, #5e3fd4 100%);
  box-shadow: 0 6px 28px rgba(186, 155, 255, 0.68);
  transform: translateY(-2px);
}

.btn-glow {
  background: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
  color: #ffffff;
  box-shadow: 0 4px 20px var(--secondary-glow);
}
.btn-glow:hover {
  background: linear-gradient(135deg, #0891b2 0%, #2563eb 100%);
  box-shadow: 0 6px 26px rgba(6, 182, 212, 0.55);
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  border: 1px solid var(--border-light);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.25);
  color: #fff;
  transform: translateY(-2px);
}

.btn-lg {
  padding: 0.95rem 2.2rem;
  font-size: 1.05rem;
}

.btn-full {
  width: 100%;
}

/* -------------------- 6. 首屏 Hero 区域 -------------------- */
.hero-section {
  padding: 5.5rem 0 4.5rem;
  text-align: center;
  position: relative;
}

.hero-badge-wrap {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.8rem;
  font-size: 0.88rem;
  color: #34d399;
}
.badge-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(0.8); }
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.22;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}
.text-grad-primary {
  background: linear-gradient(135deg, #10b981 0%, #06b6d4 50%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.text-grad-amber {
  background: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 840px;
  margin: 0 auto 2.4rem;
  line-height: 1.8;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

/* 核心特性数据跑道 */
.hero-metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-top: 2rem;
}
.metric-box {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.4rem 1rem;
  text-align: center;
  transition: var(--transition);
}
.metric-box:hover {
  border-color: var(--border-highlight);
  transform: translateY(-4px);
  box-shadow: var(--shadow-sm);
}
.metric-value {
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0.25rem;
  font-family: var(--font-mono);
}
.metric-label {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* -------------------- 7. 通用区域标题 -------------------- */
.section {
  padding: 5rem 0;
  position: relative;
}
.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 3.5rem;
}
.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--secondary);
  margin-bottom: 0.75rem;
}
.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}
.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* -------------------- 8. 核心优势卡片 -------------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}
.feature-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2.2rem 1.8rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}
.feature-card:hover {
  border-color: rgba(6, 182, 212, 0.4);
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.feature-icon-wrapper {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.7rem;
  margin-bottom: 1.5rem;
  color: var(--primary);
}
.feature-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.85rem;
  color: #fff;
}
.feature-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* -------------------- 9. 价格套餐区域 (严格满足：所有价格同排) -------------------- */
.pricing-section {
  padding: 5.5rem 0;
  background: rgba(0, 0, 0, 0.28);
}

.pricing-note-banner {
  text-align: center;
  margin-bottom: 2.5rem;
  padding: 0.85rem 1.5rem;
  background: rgba(6, 182, 212, 0.08);
  border: 1px dashed rgba(6, 182, 212, 0.35);
  border-radius: var(--radius-md);
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
  color: #a5f3fc;
  font-size: 0.95rem;
}

/* 核心要求：4 个套餐横向一排 */
.pricing-row-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  backdrop-filter: blur(18px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2rem 1.4rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: var(--transition);
}
.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
  border-color: rgba(255, 255, 255, 0.22);
}

/* 爆款热门套餐高亮 */
.pricing-card.is-popular {
  border: 2px solid var(--primary);
  background: linear-gradient(180deg, rgba(16, 185, 129, 0.12) 0%, rgba(13, 22, 38, 0.85) 100%);
  box-shadow: 0 10px 30px rgba(16, 185, 129, 0.25);
  transform: scale(1.03);
  z-index: 2;
}
.pricing-card.is-popular:hover {
  transform: scale(1.05) translateY(-8px);
  box-shadow: 0 24px 48px rgba(16, 185, 129, 0.38);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: #ffffff;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.28rem 1rem;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.45);
  white-space: nowrap;
}

.plan-header {
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 1.25rem;
  margin-bottom: 1.25rem;
  text-align: center;
}
.plan-tier-badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--secondary);
  background: rgba(6, 182, 212, 0.12);
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.6rem;
}
.plan-title {
  font-size: 1.6rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0.45rem;
}
.plan-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-height: 40px;
}

/* 价格数值展示 */
.plan-price-box {
  text-align: center;
  margin-bottom: 1.25rem;
}
.price-symbol {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--primary);
  vertical-align: top;
  line-height: 2.2;
}
.price-figure {
  font-size: 3rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: #fff;
  line-height: 1;
}
.price-unit {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* 周期优惠折扣 */
.cycle-discounts {
  background: rgba(0, 0, 0, 0.25);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.65rem;
  margin-bottom: 1.4rem;
  font-size: 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.discount-row {
  display: flex;
  justify-content: space-between;
  color: var(--text-sub);
}
.discount-row strong {
  color: #38bdf8;
  font-weight: 600;
}

/* 套餐配置参数列表 */
.plan-features-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
  font-size: 0.88rem;
  flex-grow: 1;
}
.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  color: var(--text-sub);
  line-height: 1.4;
}
.check-icon {
  color: var(--primary);
  font-weight: bold;
  flex-shrink: 0;
}

/* -------------------- 10. 客户端支持与测速展示 -------------------- */
.client-section {
  padding: 4.5rem 0;
}
.clients-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}
.client-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  transition: var(--transition);
}
.client-card:hover {
  border-color: rgba(59, 130, 246, 0.4);
  transform: translateY(-4px);
}
.client-icon {
  font-size: 2.2rem;
  margin-bottom: 0.75rem;
}
.client-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.35rem;
}
.client-meta {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

/* -------------------- 11. 文章精选专栏 (SEO 精选) -------------------- */
.articles-section {
  padding: 5rem 0;
}
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}
.article-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
}
.article-card:hover {
  border-color: var(--border-highlight);
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.article-tags {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
.article-tag {
  font-size: 0.75rem;
  background: rgba(16, 185, 129, 0.15);
  color: #6ee7b7;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
}
.article-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.45;
  margin-bottom: 0.85rem;
}
.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}
.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-light);
  padding-top: 1rem;
}
.article-read-link {
  color: var(--secondary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}
.article-read-link:hover {
  color: #38bdf8;
  transform: translateX(3px);
}

/* -------------------- 12. 用户真实评价 (Testimonials) -------------------- */
.testimonials-section {
  padding: 5rem 0;
  background: rgba(0, 0, 0, 0.2);
}
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.testimonial-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  transition: var(--transition);
}
.testimonial-card:hover {
  border-color: rgba(245, 158, 11, 0.35);
  transform: translateY(-4px);
}
.review-header {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1rem;
}
.avatar-placeholder {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, #06b6d4, #3b82f6);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 1.1rem;
  border: 2px solid rgba(255, 255, 255, 0.15);
}
.review-meta {
  flex-grow: 1;
}
.reviewer-name {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
}
.reviewer-role {
  font-size: 0.8rem;
  color: var(--text-muted);
}
.review-stars {
  color: #f59e0b;
  font-size: 0.9rem;
  letter-spacing: 2px;
}
.review-content {
  font-size: 0.92rem;
  color: var(--text-sub);
  line-height: 1.7;
}

/* -------------------- 13. 常见问题 FAQ (Accordion) -------------------- */
.faq-section {
  padding: 5rem 0;
}
.faq-list {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.faq-item {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover {
  border-color: rgba(255, 255, 255, 0.18);
}
.faq-question {
  padding: 1.35rem 1.75rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  font-size: 1.05rem;
  color: #fff;
  user-select: none;
}
.faq-toggle-icon {
  font-size: 1.25rem;
  color: var(--secondary);
  transition: transform 0.3s ease;
}
.faq-answer {
  padding: 0 1.75rem 1.4rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.8;
  display: block;
}
/* 支持 details/summary 原生展开折叠 */
details.faq-item > summary {
  list-style: none;
}
details.faq-item > summary::-webkit-details-marker {
  display: none;
}
details.faq-item[open] .faq-toggle-icon {
  transform: rotate(45deg);
}

/* -------------------- 14. 权威外链与资源聚合 -------------------- */
.external-links-section {
  padding: 3rem 0;
  border-top: 1px solid var(--border-light);
  background: rgba(0, 0, 0, 0.35);
}
.external-links-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-sub);
  margin-bottom: 1.25rem;
  text-align: center;
}
.external-links-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.5rem;
  justify-content: center;
  font-size: 0.85rem;
}
.external-link-item {
  color: var(--text-muted);
  padding: 0.35rem 0.85rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.external-link-item:hover {
  color: #38bdf8;
  border-color: rgba(56, 189, 248, 0.4);
  background: rgba(255, 255, 255, 0.06);
}

/* -------------------- 15. 页脚 Footer -------------------- */
.site-footer {
  border-top: 1px solid var(--border-light);
  background: rgba(4, 8, 14, 0.95);
  padding: 4.5rem 0 2rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 3.5rem;
}
.footer-brand-desc {
  font-size: 0.88rem;
  line-height: 1.8;
  margin: 1rem 0 1.5rem;
  max-width: 380px;
}
.footer-col-title {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 1.25rem;
}
.footer-links-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.footer-link:hover {
  color: #fff;
  transform: translateX(2px);
}
.footer-bottom {
  border-top: 1px solid var(--border-light);
  padding-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.82rem;
}

/* -------------------- 16. 文章详情页专用样式 -------------------- */
.article-detail-page {
  padding: 3.5rem 0 5rem;
}
.article-header {
  margin-bottom: 2.5rem;
  text-align: center;
}
.article-breadcrumbs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}
.article-page-title {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.35;
  color: #fff;
  margin-bottom: 1.2rem;
  max-width: 950px;
  margin-left: auto;
  margin-right: auto;
}
.article-page-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}
.article-body-container {
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-card);
  backdrop-filter: blur(18px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 3rem 2.8rem;
  font-size: 1.05rem;
  line-height: 1.95;
  color: var(--text-sub);
}
.article-body-container h2 {
  font-size: 1.7rem;
  font-weight: 700;
  color: #fff;
  margin: 2.5rem 0 1.2rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-light);
}
.article-body-container h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #e2e8f0;
  margin: 1.8rem 0 0.85rem;
}
.article-body-container p {
  margin-bottom: 1.5rem;
}
.article-body-container ul, .article-body-container ol {
  margin: 1.25rem 0 1.5rem 1.5rem;
}
.article-body-container li {
  list-style: disc;
  margin-bottom: 0.6rem;
}
.article-body-container strong {
  color: #fff;
}
.article-callout {
  background: rgba(16, 185, 129, 0.1);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 1.25rem 1.5rem;
  margin: 2rem 0;
  color: #e2e8f0;
}
.article-cta-box {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(6, 182, 212, 0.15));
  border: 1px solid rgba(16, 185, 129, 0.35);
  border-radius: var(--radius-md);
  padding: 2rem;
  text-align: center;
  margin: 3rem 0;
}
.article-nav-links {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-light);
}
.article-nav-item {
  max-width: 48%;
}

/* -------------------- 17. 响应式布局适配 -------------------- */
@media (max-width: 1180px) {
  .pricing-row-container {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
  .pricing-card.is-popular {
    transform: none;
  }
  .pricing-card.is-popular:hover {
    transform: translateY(-8px);
  }
  .features-grid, .articles-grid, .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-metrics-grid, .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.2rem;
  }
  .section-title {
    font-size: 1.85rem;
  }
  .pricing-row-container {
    grid-template-columns: 1fr;
  }
  .features-grid, .articles-grid, .testimonials-grid, .hero-metrics-grid, .clients-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .nav-menu {
    display: none; /* 可在此加入原生 details 汉堡菜单或隐藏 */
  }
  .article-body-container {
    padding: 2rem 1.4rem;
  }
  .article-nav-links {
    flex-direction: column;
  }
  .article-nav-item {
    max-width: 100%;
  }
}