/* ==========================================================================
   OIXCloud 官方落地页样式表 - 纯原生 CSS (Modern Vanilla CSS)
   秒开级别优化 · 硬件加速动态背景 · 响应式等高同排卡片
   ========================================================================== */

:root {
  --bg-primary: #060a12;
  --bg-secondary: #0b1220;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --bg-glass: rgba(11, 18, 32, 0.82);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(16, 240, 186, 0.4);
  --border-popular: rgba(16, 240, 186, 0.55);

  --accent-cyan: #10f0ba; /* 冰绿色 Ice Green */
  --accent-blue: #00ffc4;
  --accent-purple: #8b5cf6;
  --accent-emerald: #10f0ba;
  --accent-rose: #f43f5e;
  --accent-amber: #f59e0b;

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

  --grad-cyan-blue: linear-gradient(135deg, #00ffc4 0%, #10f0ba 50%, #05c48b 100%);
  --grad-blue-purple: linear-gradient(135deg, #10f0ba 0%, #05c48b 100%);
  --grad-card-glow: radial-gradient(circle at 50% 0%, rgba(16, 240, 186, 0.14) 0%, transparent 70%);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --container-max: 1240px;
  --header-height: 72px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 25px rgba(16, 240, 186, 0.3);
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

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

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

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   动态科技流光背景 (Pure CSS Dynamic Mesh Background)
   ========================================================================== */
/* ==========================================================================
   动态背景与各种各样的小火箭群 (Dynamic Space & Rockets Layer)
   ========================================================================== */
.dynamic-bg-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
  background-color: var(--bg-primary);
}

/* 网格纹理 */
.bg-grid {
  position: absolute;
  inset: 0;
  background-size: 50px 50px;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  mask-image: radial-gradient(ellipse at center, rgba(0,0,0,0.85) 0%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, rgba(0,0,0,0.85) 0%, transparent 80%);
}

/* 火箭图层容器 */
.rockets-layer {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 1;
}

.flying-rocket {
  position: absolute;
  pointer-events: none;
  will-change: transform;
  filter: drop-shadow(0 0 10px rgba(16, 240, 186, 0.35));
}

/* 尾焰跳动动画 */
.flame-pulse {
  animation: flameFlicker 0.35s infinite alternate ease-in-out;
  transform-origin: center top;
}

.flame-pulse-fast {
  animation: flameFlicker 0.2s infinite alternate ease-in-out;
  transform-origin: center top;
}

@keyframes flameFlicker {
  0% { transform: scaleY(0.85) scaleX(0.9); opacity: 0.75; }
  100% { transform: scaleY(1.25) scaleX(1.1); opacity: 1; filter: drop-shadow(0 0 10px #10f0ba); }
}

/* 火箭 1：大号青蓝专线火箭（45°从左下穿过全屏冲天） */
.rocket-1 {
  width: 120px;
  height: 120px;
  bottom: -135px;
  left: 6%;
  opacity: 0.92;
  filter: drop-shadow(0 0 20px rgba(16, 240, 186, 0.55));
  animation: flightLaunch1 16s infinite ease-out;
}

@keyframes flightLaunch1 {
  0% {
    transform: translate3d(0, 0, 0) rotate(45deg);
    opacity: 0;
  }
  10% {
    opacity: 0.92;
  }
  85% {
    opacity: 0.92;
  }
  100% {
    transform: translate3d(105vw, -125vh, 0) rotate(45deg);
    opacity: 0;
  }
}

/* 火箭 2：紫电巡航中型火箭（在右上高空巡游推进） */
.rocket-2 {
  width: 98px;
  height: 98px;
  top: 16%;
  right: 12%;
  opacity: 0.88;
  filter: drop-shadow(0 0 22px rgba(139, 92, 246, 0.65));
  animation: flightHover2 12s infinite ease-in-out;
}

@keyframes flightHover2 {
  0% {
    transform: translate3d(0, 0, 0) rotate(25deg);
  }
  50% {
    transform: translate3d(-45px, -35px, 0) rotate(32deg) scale(1.08);
  }
  100% {
    transform: translate3d(0, 0, 0) rotate(25deg);
  }
}

/* 火箭 3：金色强推力火箭（从左侧以 35°斜向上长途发射） */
.rocket-3 {
  width: 112px;
  height: 112px;
  bottom: 12%;
  left: -125px;
  opacity: 0.88;
  filter: drop-shadow(0 0 20px rgba(245, 158, 11, 0.6));
  animation: flightLaunch3 20s infinite ease-out 4s;
}

@keyframes flightLaunch3 {
  0% {
    transform: translate3d(0, 0, 0) rotate(55deg);
    opacity: 0;
  }
  12% {
    opacity: 0.88;
  }
  88% {
    opacity: 0.88;
  }
  100% {
    transform: translate3d(120vw, -95vh, 0) rotate(55deg);
    opacity: 0;
  }
}

/* 火箭 4：纯白单线极简原子小火箭（在左上区域呼吸漂浮） */
.rocket-4 {
  width: 92px;
  height: 92px;
  top: 26%;
  left: 10%;
  opacity: 0.85;
  filter: drop-shadow(0 0 16px rgba(255, 255, 255, 0.55));
  animation: flightFloat4 10s infinite alternate ease-in-out;
}

@keyframes flightFloat4 {
  0% {
    transform: translate3d(0, 0, 0) rotate(-15deg);
  }
  50% {
    transform: translate3d(35px, -45px, 0) rotate(-5deg) scale(1.06);
  }
  100% {
    transform: translate3d(-20px, 28px, 0) rotate(-22deg);
  }
}

/* 火箭 5：疾速微型火箭（超快穿梭掠影） */
.rocket-5 {
  width: 70px;
  height: 70px;
  bottom: -80px;
  left: 45%;
  opacity: 0.8;
  filter: drop-shadow(0 0 14px rgba(16, 240, 186, 0.55));
  animation: flightDash5 10s infinite linear 2s;
}

@keyframes flightDash5 {
  0% {
    transform: translate3d(0, 0, 0) rotate(40deg);
    opacity: 0;
  }
  15% {
    opacity: 0.8;
  }
  85% {
    opacity: 0.8;
  }
  100% {
    transform: translate3d(70vw, -120vh, 0) rotate(40deg);
    opacity: 0;
  }
}

/* 火箭 6：深空微光小火箭（远景漫游，深邃层次） */
.rocket-6 {
  width: 62px;
  height: 62px;
  top: 58%;
  left: 20%;
  opacity: 0.65;
  filter: drop-shadow(0 0 12px rgba(16, 240, 186, 0.45));
  animation: flightDrift6 22s infinite alternate ease-in-out 1s;
}

@keyframes flightDrift6 {
  0% {
    transform: translate3d(0, 0, 0) rotate(35deg);
  }
  50% {
    transform: translate3d(75px, -60px, 0) rotate(45deg);
  }
  100% {
    transform: translate3d(-50px, 40px, 0) rotate(28deg);
  }
}

/* 火箭 7：双翼巡逻小火箭（右下往中上） */
.rocket-7 {
  width: 105px;
  height: 105px;
  bottom: -115px;
  right: 18%;
  opacity: 0.82;
  filter: drop-shadow(0 0 18px rgba(59, 130, 246, 0.55));
  animation: flightLaunch7 17s infinite ease-out 7s;
}

@keyframes flightLaunch7 {
  0% {
    transform: translate3d(0, 0, 0) rotate(20deg);
    opacity: 0;
  }
  15% {
    opacity: 0.82;
  }
  85% {
    opacity: 0.82;
  }
  100% {
    transform: translate3d(-40vw, -120vh, 0) rotate(20deg);
    opacity: 0;
  }
}

/* 火箭 8：幽浮迷你小火箭（在中下方优雅微航） */
.rocket-8 {
  width: 80px;
  height: 80px;
  bottom: 24%;
  right: 30%;
  opacity: 0.78;
  filter: drop-shadow(0 0 16px rgba(168, 85, 247, 0.55));
  animation: flightFloat8 14s infinite alternate ease-in-out 3s;
}

@keyframes flightFloat8 {
  0% {
    transform: translate3d(0, 0, 0) rotate(48deg);
  }
  50% {
    transform: translate3d(-30px, -40px, 0) rotate(58deg) scale(1.1);
  }
  100% {
    transform: translate3d(25px, 20px, 0) rotate(42deg);
  }
}

/* 动态光晕球 1 */
.dynamic-orb-1 {
  position: absolute;
  top: 10%;
  left: 15%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(16, 240, 186, 0.16) 0%, rgba(59, 130, 246, 0.08) 45%, transparent 70%);
  filter: blur(70px);
  border-radius: 50%;
  animation: orbFloat1 22s infinite alternate ease-in-out;
  transform-origin: center;
  will-change: transform;
}

/* 动态光晕球 2 */
.dynamic-orb-2 {
  position: absolute;
  top: 40%;
  right: 10%;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.18) 0%, rgba(59, 130, 246, 0.06) 50%, transparent 70%);
  filter: blur(85px);
  border-radius: 50%;
  animation: orbFloat2 26s infinite alternate-reverse ease-in-out;
  transform-origin: center;
  will-change: transform;
}

/* 动态光晕球 3 */
.dynamic-orb-3 {
  position: absolute;
  bottom: 5%;
  left: 30%;
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.13) 0%, rgba(16, 185, 129, 0.05) 50%, transparent 70%);
  filter: blur(60px);
  border-radius: 50%;
  animation: orbFloat3 18s infinite alternate ease-in-out;
  transform-origin: center;
  will-change: transform;
}

@keyframes orbFloat1 {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(70px, 90px) scale(1.12); }
  100% { transform: translate(-50px, 50px) scale(0.95); }
}

@keyframes orbFloat2 {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-90px, -60px) scale(1.15); }
  100% { transform: translate(60px, 70px) scale(0.92); }
}

@keyframes orbFloat3 {
  0% { transform: translate(0, 0) scale(0.95); }
  50% { transform: translate(-80px, 40px) scale(1.1); }
  100% { transform: translate(50px, -70px) scale(1.05); }
}

/* ==========================================================================
   导航栏 Header / Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background-color: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 1001;
}

.brand-logo img {
  height: 38px;
  width: auto;
}

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

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

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--grad-cyan-blue);
  transition: width var(--transition-fast);
  border-radius: 2px;
}

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

.header-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: var(--grad-cyan-blue);
  color: #031812;
  font-weight: 700;
  box-shadow: 0 4px 20px rgba(16, 240, 186, 0.38);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(16, 240, 186, 0.6);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
}

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

.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 30%, rgba(255,255,255,0.3) 50%, transparent 70%);
  transform: rotate(30deg);
  animation: shine 4s infinite linear;
}

@keyframes shine {
  0% { transform: translate(-100%, -100%) rotate(30deg); }
  100% { transform: translate(100%, 100%) rotate(30deg); }
}

/* 汉堡按钮 */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  z-index: 1001;
}

.mobile-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--text-main);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* ==========================================================================
   Hero 主视觉区域
   ========================================================================== */
.hero-section {
  padding: 85px 0 70px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: rgba(16, 240, 186, 0.08);
  border: 1px solid rgba(16, 240, 186, 0.25);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  margin-bottom: 24px;
}

.hero-pill-badge {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.hero-title {
  font-size: clamp(2.3rem, 5.5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin-bottom: 22px;
}

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

.hero-description {
  max-width: 780px;
  margin: 0 auto 36px;
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

.hero-actions .btn {
  padding: 13px 32px;
  font-size: 1rem;
}

.hero-trust-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
  padding-top: 30px;
  border-top: 1px solid var(--border-subtle);
  max-width: 900px;
  margin: 0 auto;
}

.trust-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.trust-number {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-main);
  background: linear-gradient(180deg, #ffffff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.trust-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* ==========================================================================
   通用区块标题
   ========================================================================== */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto;
}

/* ==========================================================================
   价格套餐区域 (所有价格同排 Equal-Height Grid)
   ========================================================================== */
.pricing-section {
  padding: 90px 0;
  position: relative;
}

.pricing-notice {
  text-align: center;
  margin-top: 20px;
  font-size: 0.9rem;
  color: var(--text-dim);
}

/* 4列严格同排等高 Grid */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  align-items: stretch;
}

.pricing-card {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 24px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-card);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: rgba(16, 240, 186, 0.35);
  box-shadow: 0 16px 40px -10px rgba(16, 240, 186, 0.15);
}

/* 热门推荐卡片突出 */
.pricing-card.popular {
  border-color: var(--border-popular);
  background: radial-gradient(circle at 50% 0%, rgba(59, 130, 246, 0.22) 0%, rgba(15, 23, 42, 0.85) 65%);
  box-shadow: 0 16px 45px -8px rgba(59, 130, 246, 0.3);
  transform: scale(1.02);
}

.pricing-card.popular:hover {
  transform: scale(1.02) translateY(-8px);
  border-color: var(--accent-cyan);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--grad-cyan-blue);
  color: #060a12;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  white-space: nowrap;
  box-shadow: 0 2px 10px rgba(16, 240, 186, 0.4);
}

.pricing-header {
  margin-bottom: 20px;
  text-align: center;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 18px;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-main);
}

.plan-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  min-height: 38px;
}

.plan-price-wrap {
  margin: 18px 0 10px;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.plan-currency {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

.plan-amount {
  font-size: 2.7rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-main);
}

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

.plan-speed-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  color: var(--accent-cyan);
  margin-top: 6px;
}

.pricing-features {
  margin: 18px 0 24px;
  flex-grow: 1;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  color: #cbd5e1;
  margin-bottom: 11px;
}

.feature-icon {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--accent-cyan);
}

.feature-icon.highlight {
  color: var(--accent-emerald);
}

.pricing-cta {
  width: 100%;
}

.pricing-cta .btn {
  width: 100%;
  padding: 12px 18px;
}

/* ==========================================================================
   优势与特色服务 (Feature Grid)
   ========================================================================== */
.features-section {
  padding: 90px 0;
  position: relative;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(16, 240, 186, 0.3);
  box-shadow: 0 12px 35px -8px rgba(16, 240, 186, 0.12);
}

.feature-card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(16, 240, 186, 0.08);
  border: 1px solid rgba(16, 240, 186, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
}

.feature-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.feature-card-text {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.68;
}

/* ==========================================================================
   全球专线节点分布 (Global Map / Node Grid)
   ========================================================================== */
.nodes-section {
  padding: 90px 0;
  position: relative;
}

.node-clusters-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 22px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all var(--transition-fast);
}

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

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

.node-flag {
  font-size: 1.6rem;
  line-height: 1;
}

.node-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.node-type {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.node-ping {
  text-align: right;
}

.ping-val {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--accent-emerald);
}

.ping-label {
  font-size: 0.7rem;
  color: var(--text-dim);
}

/* 客户端生态支持 */
.clients-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  text-align: center;
}

.clients-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 24px;
}

.clients-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}

.client-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  transition: all var(--transition-fast);
}

.client-badge:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* ==========================================================================
   精选 SEO 文章专区 (Articles Hub)
   ========================================================================== */
.articles-section {
  padding: 90px 0;
  position: relative;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: rgba(16, 240, 186, 0.35);
  box-shadow: 0 14px 35px -10px rgba(16, 240, 186, 0.12);
}

.article-card-body {
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.article-tag {
  font-size: 0.72rem;
  padding: 2px 8px;
  background: rgba(16, 240, 186, 0.08);
  border: 1px solid rgba(16, 240, 186, 0.2);
  border-radius: 4px;
  color: var(--accent-cyan);
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.45;
  margin-bottom: 10px;
}

.article-card-excerpt {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.article-read-link {
  color: var(--accent-cyan);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.articles-hub-cta {
  text-align: center;
  margin-top: 40px;
}

/* ==========================================================================
   真实用户评价区 (User Testimonials)
   ========================================================================== */
.testimonials-section {
  padding: 90px 0;
  position: relative;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

.testimonial-card:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 255, 255, 0.18);
}

.testimonial-stars {
  color: var(--accent-amber);
  font-size: 1rem;
  margin-bottom: 14px;
  letter-spacing: 2px;
}

.testimonial-quote {
  font-size: 0.93rem;
  color: #e2e8f0;
  line-height: 1.65;
  margin-bottom: 20px;
  font-style: normal;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
}

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(16, 240, 186, 0.2), rgba(139, 92, 246, 0.3));
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--text-main);
  font-size: 1rem;
}

.user-meta-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
}

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

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

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item.active {
  border-color: rgba(16, 240, 186, 0.35);
  background: rgba(15, 23, 42, 0.9);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 22px 26px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
}

.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--accent-cyan);
  transition: transform var(--transition-normal);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease-out;
  padding: 0 26px;
  color: var(--text-muted);
  font-size: 0.93rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  padding: 0 26px 22px;
  max-height: 500px;
}

/* ==========================================================================
   外部实用链接与测速工具 (External Tools & Resources)
   ========================================================================== */
.tools-section {
  padding: 70px 0;
  position: relative;
}

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

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  transition: all var(--transition-fast);
}

.tool-card:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-3px);
  background: rgba(30, 41, 59, 0.9);
}

.tool-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(16, 240, 186, 0.08);
  border: 1px solid rgba(16, 240, 186, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.tool-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 4px;
}

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

/* ==========================================================================
   CTA 横幅区域
   ========================================================================== */
.cta-banner-section {
  padding: 80px 0;
  position: relative;
}

.cta-banner {
  background: radial-gradient(circle at 50% 50%, rgba(16, 240, 186, 0.15) 0%, rgba(15, 23, 42, 0.95) 75%);
  border: 1px solid rgba(16, 240, 186, 0.3);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 50px -15px rgba(16, 240, 186, 0.2);
}

.cta-banner-title {
  font-size: clamp(2rem, 4vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-banner-desc {
  max-width: 680px;
  margin: 0 auto 32px;
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* ==========================================================================
   页脚 Footer
   ========================================================================== */
.site-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 70px 0 35px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

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

.footer-brand p {
  margin-top: 16px;
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.65;
  max-width: 320px;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 18px;
  letter-spacing: 0.04em;
}

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

.footer-link {
  color: var(--text-muted);
  font-size: 0.88rem;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 30px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 16px;
}

.footer-legal-links {
  display: flex;
  gap: 20px;
}

/* ==========================================================================
   响应式断点适配 (Media Queries)
   ========================================================================== */
@media (max-width: 1080px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid, .testimonials-grid, .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .node-clusters-grid, .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .site-header {
    height: 64px;
  }
  
  .mobile-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 64px;
    left: 0;
    width: 100%;
    background: rgba(11, 18, 32, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: flex-start;
    padding: 24px 30px 32px;
    gap: 18px;
    border-bottom: 1px solid var(--border-subtle);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-normal);
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .header-cta-group .btn-secondary {
    display: none;
  }

  .hero-section {
    padding: 50px 0 40px;
  }

  .hero-trust-bar {
    gap: 24px;
  }

  .trust-number {
    font-size: 1.5rem;
  }

  /* 移动端价格卡片保持清晰可读的单列 */
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 420px;
    margin: 0 auto;
  }

  .pricing-card.popular {
    transform: none;
  }

  .pricing-card.popular:hover {
    transform: translateY(-5px);
  }

  .features-grid, .testimonials-grid, .articles-grid {
    grid-template-columns: 1fr;
  }

  .node-clusters-grid, .tools-grid {
    grid-template-columns: 1fr;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}