/* ==========================================================================
   牧牛云网 (muniu.mom) 官方落地页原生样式表
   规范：纯原生 CSS，零重型第三方库，极致加载速度与秒开体验
   ========================================================================== */

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #0f172a;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(24, 34, 53, 0.9);
  --bg-card-featured: rgba(16, 185, 129, 0.08);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(56, 189, 248, 0.35);
  --border-featured: rgba(16, 185, 129, 0.45);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --primary-start: #06b6d4;
  --primary-end: #10b981;
  --accent-blue: #38bdf8;
  --accent-purple: #8b5cf6;
  --accent-amber: #f59e0b;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 25px rgba(6, 182, 212, 0.25);
  --shadow-featured: 0 0 35px rgba(16, 185, 129, 0.28);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-text-size-adjust: 100%;
}

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

/* ==========================================================================
   全屏动态画布背景与美化 3D 吃草牧牛系统 (Aesthetic 3D Grazing Cow Pasture)
   ========================================================================== */
.dynamic-bg-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

#dynamic-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
  background: radial-gradient(circle at 50% 10%, rgba(6, 182, 212, 0.12), transparent 50%),
              radial-gradient(circle at 90% 75%, rgba(16, 185, 129, 0.08), transparent 40%),
              radial-gradient(circle at 10% 85%, rgba(56, 189, 248, 0.06), transparent 45%),
              #070b13;
}

/* 悠闲吃草的 3D 浮空科技牧场 (Pixar 3D 高清全彩美化版) */
.bg-cow-pasture {
  position: absolute;
  bottom: 12px;
  right: 25px;
  width: 330px;
  height: 330px;
  z-index: 2;
  pointer-events: auto;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.bg-cow-pasture:hover {
  transform: translateY(-8px) scale(1.04);
}

/* 翡翠与青空柔光呼吸光晕 */
.cow-glow-halo {
  position: absolute;
  bottom: 25px;
  width: 290px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(ellipse at center, rgba(16, 185, 129, 0.35) 0%, rgba(6, 182, 212, 0.22) 50%, transparent 75%);
  filter: blur(28px);
  animation: haloBreathe 5s ease-in-out infinite alternate;
  z-index: 1;
  pointer-events: none;
}

@keyframes haloBreathe {
  0% { transform: scale(0.92); opacity: 0.65; }
  100% { transform: scale(1.18); opacity: 1; }
}

/* 3D 浮空草地与吃草小牛主体容器 */
.cow-hd-wrapper {
  position: relative;
  width: 290px;
  height: 290px;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: cowPastureFloat 4.6s ease-in-out infinite;
  transform-origin: center bottom;
}

.cow-aesthetic-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  -webkit-mask-image: radial-gradient(circle at 50% 50%, black 50%, rgba(0, 0, 0, 0.85) 60%, transparent 70%);
  mask-image: radial-gradient(circle at 50% 50%, black 50%, rgba(0, 0, 0, 0.85) 60%, transparent 70%);
  filter: drop-shadow(0 15px 35px rgba(0, 0, 0, 0.8)) drop-shadow(0 0 20px rgba(16, 185, 129, 0.35));
  user-select: none;
  -webkit-user-drag: none;
  transition: filter 0.3s ease;
}

.bg-cow-pasture:hover .cow-aesthetic-img {
  filter: drop-shadow(0 18px 40px rgba(0, 0, 0, 0.9)) drop-shadow(0 0 28px rgba(56, 189, 248, 0.5));
}

/* 拟真浮空与微动咀嚼动效 */
@keyframes cowPastureFloat {
  0%, 100% {
    transform: translateY(0) rotate(0deg);
  }
  25% {
    transform: translateY(-5px) rotate(0.8deg);
  }
  50% {
    transform: translateY(-9px) rotate(-0.5deg);
  }
  75% {
    transform: translateY(-4px) rotate(0.6deg);
  }
}

/* 点击欢呼跳跃动画 */
.cow-hd-wrapper.jump {
  animation: cowJump 0.65s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
}

@keyframes cowJump {
  0% { transform: translateY(0) scale(1); }
  40% { transform: translateY(-28px) scale(1.08) rotate(3deg); }
  70% { transform: translateY(4px) scale(0.96); }
  100% { transform: translateY(0) scale(1); }
}

/* 气泡对话框 */
.cow-bubble {
  position: absolute;
  top: 5px;
  background: rgba(10, 15, 29, 0.94);
  border: 1px solid rgba(16, 185, 129, 0.55);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: #34d399;
  font-size: 12px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.55), 0 0 16px rgba(16, 185, 129, 0.3);
  animation: bubbleFloat 3.8s ease-in-out infinite;
  white-space: nowrap;
  z-index: 4;
  pointer-events: none;
  transition: all 0.25s ease;
}

/* 环绕吃草小牛的黄色五角星动效 */
.cow-floating-stars {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 3;
}

.cow-star {
  position: absolute;
  fill: #facc15;
  filter: drop-shadow(0 0 6px rgba(250, 204, 21, 0.85)) drop-shadow(0 0 14px rgba(245, 158, 11, 0.55));
  animation: starFloatTwinkle 3.6s ease-in-out infinite alternate;
}

.cow-star.star-1 {
  width: 22px;
  height: 22px;
  top: 48px;
  left: 20px;
  animation-duration: 3.2s;
  animation-delay: 0s;
  fill: #facc15;
}

.cow-star.star-2 {
  width: 16px;
  height: 16px;
  top: 85px;
  right: 25px;
  animation-duration: 4.1s;
  animation-delay: 0.8s;
  fill: #fef08a;
}

.cow-star.star-3 {
  width: 24px;
  height: 24px;
  bottom: 85px;
  left: 12px;
  animation-duration: 3.8s;
  animation-delay: 1.5s;
  fill: #fbbf24;
}

.cow-star.star-4 {
  width: 17px;
  height: 17px;
  bottom: 65px;
  right: 18px;
  animation-duration: 4.5s;
  animation-delay: 0.4s;
  fill: #f59e0b;
}

@keyframes starFloatTwinkle {
  0% {
    transform: translateY(0) rotate(0deg) scale(0.9);
    opacity: 0.7;
  }
  50% {
    transform: translateY(-12px) rotate(35deg) scale(1.15);
    opacity: 1;
    filter: drop-shadow(0 0 12px rgba(250, 204, 21, 1)) drop-shadow(0 0 20px rgba(251, 191, 36, 0.8));
  }
  100% {
    transform: translateY(-6px) rotate(-20deg) scale(0.95);
    opacity: 0.75;
  }
}

.cow-bubble::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 6px solid rgba(10, 15, 29, 0.94);
}

@keyframes bubbleFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

@media (max-width: 1200px) {
  .bg-cow-pasture {
    width: 260px;
    height: 260px;
    right: 20px;
    bottom: 8px;
  }
  .cow-hd-wrapper {
    width: 230px;
    height: 230px;
  }
}

@media (max-width: 860px) {
  .bg-cow-pasture {
    width: 200px;
    height: 200px;
    right: 10px;
    bottom: 5px;
    opacity: 0.92;
  }
  .cow-hd-wrapper {
    width: 180px;
    height: 180px;
  }
  .cow-bubble {
    font-size: 11px;
    padding: 3px 10px;
    top: 0px;
  }
}

@media (max-width: 500px) {
  .bg-cow-pasture {
    width: 145px;
    height: 145px;
    right: 5px;
    bottom: 2px;
    opacity: 0.88;
  }
  .cow-hd-wrapper {
    width: 130px;
    height: 130px;
  }
  .cow-bubble {
    display: none;
  }
}

.site-wrapper {
  position: relative;
  z-index: 1;
}

/* 通用容器 */
.container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 排版与渐变字 */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

.gradient-text {
  background: linear-gradient(135deg, #38bdf8 0%, #06b6d4 40%, #10b981 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.gradient-text-gold {
  background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 50%, #d97706 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* ==========================================================================
   按钮系统规范 (含规范要求的 rel=nofollow & target=_blank CTA)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  text-align: center;
  white-space: nowrap;
  user-select: none;
}

.btn-primary {
  background: linear-gradient(135deg, #06b6d4 0%, #10b981 100%);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(6, 182, 212, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.45);
  filter: brightness(1.08);
  color: #ffffff;
}

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

.btn-glow::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.25) 0%, transparent 65%);
  opacity: 0;
  transition: opacity 0.3s;
}

.btn-glow:hover::after {
  opacity: 1;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
}

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

.btn-accent {
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
  color: #ffffff;
}

.btn-accent:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(56, 189, 248, 0.35);
}

.btn-block {
  display: flex;
  width: 100%;
}

/* ==========================================================================
   导航头部 (左上方要有这个 logo)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(10, 14, 23, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: background 0.3s;
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.nav-brand img {
  display: block;
  height: 42px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 26px;
  list-style: none;
}

.nav-link {
  font-size: 14.5px;
  font-weight: 500;
  color: var(--text-secondary);
  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, #06b6d4, #10b981);
  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;
}

.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 20px;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* ==========================================================================
   Hero 首屏区域
   ========================================================================== */
.hero-section {
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.3);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  font-size: 13.5px;
  font-weight: 500;
  color: #38bdf8;
  margin-bottom: 24px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse-ring 1.8s infinite cubic-bezier(0.45, 0, 0.2, 1);
}

@keyframes pulse-ring {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: clamp(32px, 5.2vw, 56px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 22px;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: clamp(16px, 1.8vw, 19px);
  color: var(--text-secondary);
  max-width: 860px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-subtitle strong {
  color: #ffffff;
}

.hero-chips {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 36px;
}

.hero-chip {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  padding: 7px 14px;
  border-radius: var(--radius-full);
  font-size: 13.5px;
  color: #cbd5e1;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-chip strong {
  color: #38bdf8;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 1060px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  backdrop-filter: blur(12px);
}

.metric-item {
  text-align: center;
  position: relative;
}

.metric-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: -10px;
  top: 15%;
  height: 70%;
  width: 1px;
  background: var(--border-color);
}

.metric-val {
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 800;
  font-family: var(--font-mono);
  color: #ffffff;
  line-height: 1.1;
  margin-bottom: 6px;
}

.metric-val span {
  font-size: 16px;
  color: var(--primary-start);
  font-family: var(--font-sans);
}

.metric-label {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ==========================================================================
   通用的 Section 样式
   ========================================================================== */
.section {
  padding: 85px 0;
  position: relative;
}

.section-alt {
  background: rgba(15, 23, 42, 0.45);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 54px;
}

.section-tag {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent-blue);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
}

.section-title {
  font-size: clamp(26px, 3.6vw, 40px);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
}

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 30px;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-glow);
  background: var(--bg-card-hover);
}

.feature-icon-wrap {
  width: 54px;
  height: 54px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(16, 185, 129, 0.15));
  border: 1px solid rgba(56, 189, 248, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 20px;
}

.feature-title {
  font-size: 20px;
  margin-bottom: 12px;
  color: #ffffff;
}

.feature-desc {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ==========================================================================
   价格套餐区域 - 严格规范：所有价格要同排
   4个套餐必须在同一行水平排列，保证对比性与整齐性
   ========================================================================== */
.pricing-section {
  position: relative;
}

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

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  position: relative;
  backdrop-filter: blur(12px);
}

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

/* 爆款高亮卡片 (白银旗舰专线) */
.pricing-card.featured {
  background: linear-gradient(180deg, rgba(16, 185, 129, 0.1) 0%, rgba(10, 14, 23, 0.9) 100%);
  border: 2px solid var(--border-featured);
  box-shadow: var(--shadow-featured);
}

.pricing-card.featured:hover {
  border-color: #10b981;
  box-shadow: 0 0 45px rgba(16, 185, 129, 0.4);
}

.plan-top-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #10b981, #06b6d4);
  color: #ffffff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

.pricing-header {
  text-align: center;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 22px;
}

.plan-tier-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-blue);
  background: rgba(56, 189, 248, 0.1);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 10px;
}

.pricing-card.featured .plan-tier-badge {
  color: #34d399;
  background: rgba(16, 185, 129, 0.15);
}

.plan-name {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 8px;
}

.plan-target {
  font-size: 13px;
  color: var(--text-secondary);
  min-height: 38px;
  line-height: 1.45;
  margin-bottom: 16px;
}

.pricing-figure {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 2px;
}

.currency-symbol {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary-start);
}

.price-num {
  font-size: 46px;
  font-weight: 900;
  font-family: var(--font-mono);
  color: #ffffff;
  line-height: 1;
}

.pricing-card.featured .price-num {
  color: #34d399;
}

.price-cycle {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}

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

.pricing-features li {
  font-size: 13.5px;
  color: #cbd5e1;
  display: flex;
  align-items: flex-start;
  gap: 9px;
  line-height: 1.5;
}

.pricing-features li::before {
  content: '✓';
  color: #10b981;
  font-weight: 800;
  font-size: 14px;
  flex-shrink: 0;
  margin-top: 1px;
}

.pricing-features li strong {
  color: #ffffff;
}

.pricing-card-footer {
  margin-top: auto;
}

.pricing-tip {
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 10px;
}

/* ==========================================================================
   实测测速与节点延迟矩阵 (Speed & Latency Live Matrix)
   ========================================================================== */
.speed-matrix-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.speed-matrix-table th,
.speed-matrix-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  font-size: 14px;
}

.speed-matrix-table th {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.speed-matrix-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.node-name-cell {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}

.flag-icon {
  font-size: 18px;
}

.latency-val {
  font-family: var(--font-mono);
  font-weight: 700;
  color: #34d399;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
}

/* ==========================================================================
   客户端生态与下载适配 (Clients Ecosystem)
   ========================================================================== */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.client-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.client-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.client-icon {
  font-size: 40px;
  margin-bottom: 14px;
}

.client-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 6px;
}

.client-os {
  font-size: 13px;
  color: var(--accent-blue);
  margin-bottom: 12px;
}

.client-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 18px;
  flex: 1;
}

/* ==========================================================================
   机场推荐专栏文章预览 (Articles Section)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-glow);
  background: var(--bg-card-hover);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.article-tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--primary-start);
  background: rgba(6, 182, 212, 0.1);
  padding: 3px 9px;
  border-radius: var(--radius-full);
}

.article-read-time {
  font-size: 12px;
  color: var(--text-muted);
}

.article-title {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
  color: #ffffff;
}

.article-title a:hover {
  color: var(--accent-blue);
}

.article-excerpt {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  flex: 1;
}

.article-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-blue);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
}

.article-link:hover {
  color: #ffffff;
  gap: 9px;
}

/* ==========================================================================
   真实用户评价 (User Reviews & Testimonials)
   ========================================================================== */
.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-md);
  padding: 26px;
  backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
}

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

.review-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.review-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, #06b6d4, #10b981);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
  flex-shrink: 0;
}

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

.review-name {
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 6px;
}

.verified-tag {
  font-size: 11px;
  font-weight: 600;
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  padding: 1px 6px;
  border-radius: 4px;
}

.review-role {
  font-size: 12.5px;
  color: var(--text-muted);
}

.review-stars {
  color: #f59e0b;
  font-size: 14px;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 14px;
  color: #cbd5e1;
  line-height: 1.65;
  flex: 1;
}

.review-date {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 14px;
  text-align: right;
}

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

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.25s ease;
  backdrop-filter: blur(10px);
}

.faq-item:hover {
  border-color: rgba(56, 189, 248, 0.3);
}

.faq-question {
  padding: 20px 24px;
  font-size: 16.5px;
  font-weight: 600;
  color: #ffffff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  background: transparent;
  width: 100%;
  border: none;
  text-align: left;
}

.faq-icon {
  font-size: 18px;
  color: var(--accent-blue);
  transition: transform 0.25s ease;
  flex-shrink: 0;
  margin-left: 12px;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  padding: 0 24px;
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 800px;
  padding-bottom: 22px;
  transition: max-height 0.35s ease-in-out;
}

/* ==========================================================================
   权威工具与外链导航 (External Authorities Links)
   ========================================================================== */
.external-links-bar {
  background: rgba(15, 23, 42, 0.6);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  padding: 32px 0;
}

.external-links-flex {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 20px;
}

.external-link-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 13.5px;
  color: #cbd5e1;
  transition: all 0.2s ease;
}

.external-link-pill:hover {
  background: rgba(56, 189, 248, 0.1);
  border-color: var(--accent-blue);
  color: #ffffff;
  transform: translateY(-2px);
}

/* ==========================================================================
   底栏 Footer
   ========================================================================== */
.site-footer {
  background: #080c14;
  border-top: 1px solid var(--border-color);
  padding: 60px 0 30px;
  color: var(--text-secondary);
}

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

.footer-brand img {
  height: 42px;
  width: auto;
  margin-bottom: 16px;
}

.footer-tagline {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 360px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 13.5px;
  color: var(--text-secondary);
}

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

.footer-bottom {
  padding-top: 25px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
}

/* ==========================================================================
   底部全局 CTA 转化横幅卡片 (Bottom CTA Section Card)
   ========================================================================== */
.bottom-cta-card {
  position: relative;
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(10, 15, 29, 0.96) 100%);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-lg);
  padding: 56px 40px;
  text-align: center;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6), 0 0 30px rgba(6, 182, 212, 0.15);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  overflow: hidden;
  max-width: 1040px;
  margin: 0 auto;
}

.bottom-cta-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 50% 50%, rgba(6, 182, 212, 0.12), rgba(16, 185, 129, 0.06) 40%, transparent 65%);
  pointer-events: none;
}

.bottom-cta-title {
  font-size: clamp(26px, 3.8vw, 40px);
  font-weight: 800;
  margin-bottom: 16px;
  text-align: center;
  position: relative;
  z-index: 1;
}

.bottom-cta-desc {
  font-size: 16.5px;
  color: var(--text-secondary);
  max-width: 720px;
  margin: 0 auto 32px;
  line-height: 1.7;
  text-align: center;
  position: relative;
  z-index: 1;
}

.bottom-cta-desc strong {
  color: #38bdf8;
}

.bottom-cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

@media (max-width: 768px) {
  .bottom-cta-card {
    padding: 38px 20px;
  }
}

/* ==========================================================================
   响应式断点设计 (Mobile & Tablet Responsiveness)
   ========================================================================== */
@media (max-width: 1100px) {
  .pricing-row-container {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  
  .features-grid,
  .articles-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    background: rgba(10, 14, 23, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 18px;
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-150%);
    transition: transform 0.3s ease;
    z-index: 99;
  }
  
  .nav-menu.show {
    transform: translateY(0);
  }
  
  .menu-toggle {
    display: block;
  }
  
  .nav-actions {
    display: none;
  }
  
  .hero-metrics {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  
  .metric-item:not(:last-child)::after {
    display: none;
  }
  
  .pricing-row-container {
    grid-template-columns: 1fr;
    max-width: 440px;
    margin: 0 auto;
  }
  
  .features-grid,
  .articles-grid,
  .reviews-grid,
  .clients-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }
  
  .footer-top {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .speed-matrix-table th:nth-child(4),
  .speed-matrix-table td:nth-child(4) {
    display: none;
  }
}