/* ==========================================================================
   耶耶云 YeYeYun · 赛博网格 + 科技终端 + 服务器美学核心样式库
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;700;800&family=Inter:wght@400;500;600;700&display=swap');

:root {
  /* 【配色规范】 */
  --bg-primary: #020617;       /* 深空黑 */
  --bg-secondary: #050e24;
  --bg-card: rgba(4, 18, 38, 0.65);
  --bg-card-hover: rgba(6, 182, 212, 0.08);
  
  --primary: #06b6d4;          /* 主色：青色 */
  --primary-bright: #22d3ee;   /* 次色：亮青 */
  --primary-glow: rgba(6, 182, 212, 0.35);
  
  --text-main: #ffffff;
  --text-muted: rgba(255, 255, 255, 0.7);
  --text-dim: rgba(255, 255, 255, 0.5);   /* rgba(255,255,255,0.5) */
  
  --border-color: rgba(6, 182, 212, 0.22);
  --border-highlight: rgba(34, 211, 238, 0.6);
  --border-cyan-solid: #06b6d4;
  
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;

  /* 【字体规范】 */
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --font-body: 'Inter', 'Source Han Sans SC', 'PingFang SC', -apple-system, sans-serif;

  --max-width: 1200px;
}

/* 全局重置与基础配置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* ==========================================================================
   【背景动效】：透视网格 + 扫描线纹理 + 双青色光晕
   ========================================================================== */

/* 1. 全屏透视网格层 (从中心向外延伸，缓慢呼吸变化) */
.cyber-grid-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
  perspective: 700px;
}

.cyber-grid-plane {
  position: absolute;
  top: 15%;
  left: -50%;
  width: 200%;
  height: 200%;
  background-image: 
    linear-gradient(to right, rgba(6, 182, 212, 0.16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(6, 182, 212, 0.16) 1px, transparent 1px);
  background-size: 60px 60px;
  transform: rotateX(65deg);
  transform-origin: top center;
  animation: gridBreathe 8s ease-in-out infinite alternate;
  mask-image: radial-gradient(ellipse at 50% 10%, black 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 10%, black 20%, transparent 75%);
}

@keyframes gridBreathe {
  0% {
    opacity: 0.35;
    background-size: 58px 58px;
    filter: drop-shadow(0 0 1px rgba(6, 182, 212, 0.2));
  }
  100% {
    opacity: 0.85;
    background-size: 62px 62px;
    filter: drop-shadow(0 0 6px rgba(34, 211, 238, 0.5));
  }
}

/* 2. 细密扫描线纹理 (透明度 0.04) */
.cyber-scanlines {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0px,
    transparent 2px,
    rgba(2, 6, 23, 0.85) 3px,
    rgba(2, 6, 23, 0.85) 4px
  );
  opacity: 0.04;
}

/* 3. 两个大型青色呼吸光晕 (mix-blend-mode: screen) */
.cyber-orb {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  mix-blend-mode: screen;
  filter: blur(100px);
  z-index: 0;
}

.cyber-orb-1 {
  top: -100px;
  right: -50px;
  width: 580px;
  height: 580px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.4) 0%, rgba(34, 211, 238, 0.15) 50%, transparent 75%);
  animation: orbBreathe1 9s ease-in-out infinite alternate;
}

.cyber-orb-2 {
  bottom: 5%;
  left: -120px;
  width: 620px;
  height: 620px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.35) 0%, rgba(6, 182, 212, 0.12) 50%, transparent 75%);
  animation: orbBreathe2 11s ease-in-out infinite alternate;
}

@keyframes orbBreathe1 {
  0% { transform: scale(0.9) translate(0, 0); opacity: 0.6; }
  100% { transform: scale(1.15) translate(-30px, 40px); opacity: 0.95; }
}

@keyframes orbBreathe2 {
  0% { transform: scale(1.1) translate(0, 0); opacity: 0.55; }
  100% { transform: scale(0.85) translate(40px, -30px); opacity: 0.9; }
}

/* 容器与定位层级 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

/* ==========================================================================
   【CTA 按钮规范】：青色描边无填充、hover变色文字变黑、圆角4px、等宽字体
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 4px;             /* 圆角 4px 规范 */
  font-family: var(--font-mono);  /* 等宽字体规范 */
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.22s cubic-bezier(0.4, 0, 0.2, 1);
  min-height: 44px;
  white-space: nowrap;
  letter-spacing: 0.3px;
  
  /* 基础无填充青色描边 */
  background: transparent;
  border: 1px solid var(--primary);
  color: var(--primary-bright);
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.15);
}

.btn:hover {
  background: var(--primary);     /* hover 填充青色 */
  color: #020617;                 /* 文字变深黑 */
  border-color: var(--primary-bright);
  box-shadow: 0 0 25px rgba(34, 211, 238, 0.65);
  transform: translateY(-2px);
}

.btn-primary {
  /* 强调按钮加重光效 */
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.35);
}

.btn-secondary {
  border-color: rgba(6, 182, 212, 0.45);
  color: #ffffff;
  background: rgba(6, 182, 212, 0.05);
}

.btn-secondary:hover {
  background: var(--primary-bright);
  color: #020617;
  border-color: var(--primary-bright);
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.5);
}

.btn-sm {
  padding: 7px 16px;
  font-size: 0.85rem;
  min-height: 38px;
}

.btn-lg {
  padding: 14px 32px;
  font-size: 1.05rem;
  font-weight: 700;
  min-height: 50px;
}

.btn-block {
  width: 100%;
}

/* 导航栏 */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background-color: rgba(2, 6, 23, 0.88);
  border-bottom: 1px solid var(--border-color);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.5px;
  text-decoration: none;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: 4px;
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-bright);
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.3);
}

.brand-text {
  color: #ffffff;
  text-shadow: 0 0 12px rgba(6, 182, 212, 0.4);
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(6, 182, 212, 0.15);
  color: var(--primary-bright);
  border: 1px solid var(--border-highlight);
  margin-left: 6px;
}

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

.nav-links a {
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s ease;
  position: relative;
}

.nav-links a:hover {
  color: var(--primary-bright);
  text-shadow: 0 0 8px var(--primary);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* ==========================================================================
   【大标题布局】左侧 H1「耶耶云」JetBrains Mono + 右侧 280x280px 服务器机柜
   ========================================================================== */

.hero {
  padding: 70px 0 60px;
  position: relative;
  overflow: visible;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 40px;
  margin-bottom: 50px;
}

.hero-left {
  text-align: left;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid var(--border-color);
  padding: 6px 16px;
  border-radius: 4px;
  color: var(--primary-bright);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  margin-bottom: 22px;
}

.hero-pill .dot {
  width: 7px;
  height: 7px;
  background-color: var(--primary-bright);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--primary-bright);
  animation: blinkFast 1.5s infinite;
}

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

/* H1「耶耶云」JetBrains Mono 700 + 青色发光阴影 */
.hero-headline {
  font-family: var(--font-mono);
  font-size: 3.2rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.5px;
  color: #ffffff;
  margin-bottom: 20px;
  text-shadow: 0 0 25px rgba(6, 182, 212, 0.7), 0 0 50px rgba(6, 182, 212, 0.35);
}

.hero-headline .brand-highlight {
  color: var(--primary-bright);
  text-shadow: 0 0 30px rgba(34, 211, 238, 0.9), 0 0 60px rgba(6, 182, 212, 0.5);
}

.hero-headline .text-gradient {
  color: #ffffff;
  border-bottom: 2px solid var(--primary);
  display: inline-block;
  padding-bottom: 2px;
}

.hero-subhead {
  font-size: 1.05rem;
  color: var(--text-dim);   /* rgba(255,255,255,0.5) */
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 620px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* 核心指标统计 */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 22px 28px;
  backdrop-filter: blur(12px);
  box-shadow: 0 0 30px rgba(2, 6, 23, 0.8), inset 0 0 15px rgba(6, 182, 212, 0.05);
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-right: 1px solid var(--border-color);
}

.stat-item:last-child {
  border-right: none;
}

.stat-value {
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--primary-bright);
  font-family: var(--font-mono);
  text-shadow: 0 0 12px rgba(6, 182, 212, 0.5);
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* ==========================================================================
   【科技感右侧动画】：280×280px 服务器机柜图形 + 浮动 + 负载流 + 数据光线 + LCD
   ========================================================================== */

.hero-right {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

/* 机柜整体外框 (含左右流光定位) */
.rack-stage {
  position: relative;
  width: 360px;
  height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 280×280px 服务器机柜主结构 (4秒周期浮动) */
.server-rack {
  width: 280px;
  height: 280px;
  background: rgba(3, 11, 26, 0.95);
  border: 2px solid var(--primary);
  border-radius: 6px;
  box-shadow: 0 0 35px rgba(6, 182, 212, 0.35), inset 0 0 20px rgba(6, 182, 212, 0.15);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 10px;
  position: relative;
  z-index: 5;
  animation: rackFloat 4s ease-in-out infinite;
}

@keyframes rackFloat {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

/* 机柜耳片固定螺丝装饰 */
.rack-bracket-left, .rack-bracket-right {
  position: absolute;
  top: 10px;
  bottom: 10px;
  width: 5px;
  background: repeating-linear-gradient(to bottom, #06b6d4 0px, #06b6d4 2px, transparent 2px, transparent 18px);
}
.rack-bracket-left { left: 3px; }
.rack-bracket-right { right: 3px; }

/* 4 个 1U 服务器单元垂直堆叠 */
.server-unit {
  height: 58px;
  background: rgba(5, 17, 38, 0.9);
  border: 1px solid rgba(6, 182, 212, 0.4);
  border-radius: 4px;
  padding: 6px 10px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}

.server-unit-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.unit-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--primary-bright);
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  gap: 5px;
}

.unit-tag::before {
  content: "▶";
  font-size: 0.6rem;
  color: var(--primary);
}

/* 3 个 LED 指示灯按不同节奏闪烁 */
.unit-leds {
  display: flex;
  align-items: center;
  gap: 5px;
}

.led {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--primary);
  box-shadow: 0 0 6px var(--primary);
}

.led-1 { animation: ledPulse1 0.8s infinite ease-in-out; }
.led-2 { animation: ledPulse2 1.3s infinite ease-in-out; }
.led-3 { animation: ledPulse3 1.9s infinite ease-in-out; }

@keyframes ledPulse1 { 0%, 100% { opacity: 0.3; } 50% { opacity: 1; background-color: #22d3ee; } }
@keyframes ledPulse2 { 0%, 100% { opacity: 1; background-color: #10b981; } 50% { opacity: 0.2; } }
@keyframes ledPulse3 { 0%, 100% { opacity: 0.4; } 50% { opacity: 1; background-color: #06b6d4; } }

/* 实时负载条 (青色渐变流动) */
.load-bar-wrap {
  width: 100%;
  height: 6px;
  background: rgba(2, 6, 23, 0.8);
  border-radius: 2px;
  overflow: hidden;
  border: 1px solid rgba(6, 182, 212, 0.25);
  position: relative;
}

.load-bar-inner {
  height: 100%;
  background: linear-gradient(90deg, #06b6d4 0%, #22d3ee 50%, #38bdf8 100%);
  background-size: 200% 100%;
  animation: loadFlow 2s linear infinite;
  border-radius: 2px;
}

@keyframes loadFlow {
  0% { background-position: 100% 0; }
  100% { background-position: -100% 0; }
}

/* 左右两侧各 3 条青色数据流光线 (SVG 虚线 + dashoffset 流动动画 + 辉光) */
.stream-svg {
  position: absolute;
  top: 0;
  width: 44px;
  height: 100%;
  pointer-events: none;
  z-index: 2;
  filter: drop-shadow(0 0 6px var(--primary-bright));
}

.stream-left { left: 0; }
.stream-right { right: 0; }

.stream-line {
  stroke: var(--primary-bright);
  stroke-width: 2;
  stroke-dasharray: 6 4;
  fill: none;
}

.stream-in {
  animation: flowIn 1.4s linear infinite;
}

.stream-out {
  animation: flowOut 1.4s linear infinite;
}

@keyframes flowIn {
  from { stroke-dashoffset: 20; }
  to { stroke-dashoffset: 0; }
}

@keyframes flowOut {
  from { stroke-dashoffset: 0; }
  to { stroke-dashoffset: 20; }
}

/* 机柜中央叠加 LCD 状态显示屏 */
.lcd-display {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 220px;
  background: rgba(2, 6, 23, 0.94);
  border: 1px solid var(--primary-bright);
  border-radius: 4px;
  padding: 10px 12px;
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.5), inset 0 0 10px rgba(6, 182, 212, 0.25);
  z-index: 10;
  text-align: center;
  font-family: var(--font-mono);
  animation: lcdFlicker 3s infinite ease-in-out;
}

@keyframes lcdFlicker {
  0%, 94%, 98%, 100% { opacity: 1; filter: brightness(1); }
  95% { opacity: 0.88; filter: brightness(1.3); }
  97% { opacity: 0.92; filter: brightness(0.9); }
}

.lcd-title {
  font-size: 0.65rem;
  color: var(--primary);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.lcd-status-online {
  font-size: 1.15rem;
  font-weight: 800;
  color: #ffffff;
  text-shadow: 0 0 10px var(--primary-bright);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.lcd-status-online .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px #10b981;
}

.lcd-stats {
  font-size: 0.68rem;
  color: var(--text-dim);
  border-top: 1px dashed rgba(6, 182, 212, 0.3);
  padding-top: 4px;
  display: flex;
  justify-content: space-between;
}

/* ==========================================================================
   页面其他各板块（严格保留排版与栅格结构，融入科技终端风格）
   ========================================================================== */

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 52px;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--primary-bright);
  background: rgba(6, 182, 212, 0.08);
  padding: 5px 14px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  margin-bottom: 14px;
  text-shadow: 0 0 8px rgba(6, 182, 212, 0.4);
}

.section-title {
  font-family: var(--font-mono);
  font-size: 2.15rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 14px;
  color: #ffffff;
  text-shadow: 0 0 20px rgba(6, 182, 212, 0.35);
}

.section-subtitle {
  color: var(--text-dim);
  font-size: 1rem;
  line-height: 1.65;
}

/* 核心优势板块 (3个卡片) */
.features-section {
  padding: 80px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 34px 28px;
  transition: all 0.28s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary-bright);
  opacity: 0;
  transition: opacity 0.28s ease;
  box-shadow: 0 0 10px var(--primary-bright);
}

.feature-card:hover {
  transform: translateY(-5px);
  background: var(--bg-card-hover);
  border-color: var(--primary-bright);
  box-shadow: 0 0 25px rgba(6, 182, 212, 0.3);
}

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

.feature-icon-wrapper {
  width: 54px;
  height: 54px;
  border-radius: 4px;
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--primary-bright);
  box-shadow: 0 0 12px rgba(6, 182, 212, 0.2);
}

.feature-title {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #ffffff;
}

.feature-desc {
  color: var(--text-dim);
  font-size: 0.94rem;
  line-height: 1.65;
  margin-bottom: 20px;
}

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

.feature-list li {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.85);
  display: flex;
  align-items: center;
  gap: 8px;
}

.feature-list li svg {
  color: var(--primary-bright);
  flex-shrink: 0;
}

/* 流媒体与 AI 支持图卡 */
.media-ai-section {
  padding: 80px 0;
}

.media-ai-banner {
  background: rgba(3, 11, 26, 0.88);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 44px;
  box-shadow: 0 0 35px rgba(2, 6, 23, 0.9), inset 0 0 20px rgba(6, 182, 212, 0.05);
}

.media-ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
}

.category-box {
  background: rgba(6, 182, 212, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 28px;
}

.category-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #ffffff;
}

.category-desc {
  color: var(--text-dim);
  font-size: 0.9rem;
  margin-bottom: 20px;
  line-height: 1.6;
}

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.app-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(6, 182, 212, 0.06);
  border: 1px solid rgba(6, 182, 212, 0.22);
  padding: 7px 13px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #ffffff;
  transition: all 0.2s ease;
}

.app-pill:hover {
  background: rgba(6, 182, 212, 0.18);
  border-color: var(--primary-bright);
  color: var(--primary-bright);
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.3);
  transform: translateY(-2px);
}

.app-pill .badge-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--primary-bright);
  box-shadow: 0 0 6px var(--primary-bright);
}

/* 套餐价格对比表 (4列栅格) */
.pricing-section {
  padding: 80px 0;
}

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

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 34px 22px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.28s ease;
}

.pricing-card:hover {
  border-color: var(--primary-bright);
  transform: translateY(-5px);
  box-shadow: 0 0 25px rgba(6, 182, 212, 0.28);
}

.pricing-card.popular {
  background: rgba(5, 17, 38, 0.95);
  border: 1px solid var(--primary-bright);
  box-shadow: 0 0 35px rgba(6, 182, 212, 0.35);
  transform: scale(1.02);
}

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

.popular-badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: #020617;
  padding: 3px 14px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  box-shadow: 0 0 12px var(--primary);
}

.plan-name {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: #ffffff;
}

.plan-desc {
  font-size: 0.82rem;
  color: var(--text-dim);
  min-height: 40px;
}

.plan-price-wrap {
  margin: 20px 0;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.plan-currency {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--primary-bright);
}

.plan-price {
  font-size: 2.35rem;
  font-weight: 800;
  color: #ffffff;
  font-family: var(--font-mono);
  text-shadow: 0 0 15px rgba(6, 182, 212, 0.5);
}

.plan-cycle {
  font-size: 0.85rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

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

.plan-features li {
  font-size: 0.86rem;
  color: rgba(255, 255, 255, 0.85);
  display: flex;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.4;
}

.plan-features li svg {
  color: var(--primary-bright);
  flex-shrink: 0;
  margin-top: 2px;
}

.plan-features li.dim {
  color: var(--text-dim);
}

.plan-features li.dim svg {
  color: var(--text-dim);
}

/* 用户评价 */
.reviews-section {
  padding: 80px 0;
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.28s ease;
}

.review-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--primary-bright);
  transform: translateY(-3px);
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.2);
}

.review-stars {
  color: var(--primary-bright);
  display: flex;
  gap: 4px;
  margin-bottom: 12px;
  letter-spacing: 2px;
  text-shadow: 0 0 6px var(--primary);
}

.review-text {
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.65;
  margin-bottom: 20px;
}

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

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 4px;
  background: rgba(6, 182, 212, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--primary-bright);
  border: 1px solid var(--border-color);
}

.author-info h4 {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: #ffffff;
}

.author-info p {
  font-size: 0.76rem;
  color: var(--text-dim);
}

/* FAQ 常见问题 (6个) */
.faq-section {
  padding: 80px 0 100px;
}

.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item[open] {
  border-color: var(--primary-bright);
  background: var(--bg-card-hover);
  box-shadow: 0 0 18px rgba(6, 182, 212, 0.2);
}

.faq-question {
  padding: 18px 22px;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: #ffffff;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-icon {
  width: 18px;
  height: 18px;
  transition: transform 0.25s ease;
  color: var(--primary-bright);
}

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

.faq-answer {
  padding: 0 22px 20px;
  color: var(--text-dim);
  font-size: 0.94rem;
  line-height: 1.65;
  border-top: 1px solid rgba(6, 182, 212, 0.15);
  padding-top: 12px;
}

/* 底部 CTA 诱导横幅 */
.cta-banner {
  padding: 70px 0;
  text-align: center;
}

.cta-box {
  background: rgba(3, 11, 26, 0.9);
  border: 1px solid var(--primary);
  border-radius: 4px;
  padding: 50px 32px;
  max-width: 880px;
  margin: 0 auto;
  box-shadow: 0 0 40px rgba(6, 182, 212, 0.35);
}

.cta-box h2 {
  font-family: var(--font-mono);
  font-size: 2.1rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: #ffffff;
  text-shadow: 0 0 20px rgba(6, 182, 212, 0.5);
}

.cta-box p {
  color: var(--text-dim);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto 28px;
}

/* 页脚 (规范：仅保留 4 个标题：网站地图、关于我们、服务条款、隐私政策) */
.footer {
  margin-top: auto;
  background-color: #01040e;
  border-top: 1px solid var(--border-color);
  padding: 40px 0 32px;
  position: relative;
  z-index: 2;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.footer-link {
  color: rgba(255, 255, 255, 0.85);
  font-family: var(--font-mono);
  font-size: 0.98rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 4px;
  text-decoration: none;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.footer-link:hover {
  color: var(--primary-bright);
  border-color: var(--primary);
  background: rgba(6, 182, 212, 0.1);
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.3);
}

.footer-copy {
  text-align: center;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

/* 子页面内容通用排版 */
.page-container {
  max-width: 860px;
  margin: 45px auto 75px;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

.page-header {
  margin-bottom: 36px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-color);
}

.page-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--primary-bright);
  background: rgba(6, 182, 212, 0.1);
  padding: 4px 12px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  margin-bottom: 12px;
  font-weight: 600;
}

.page-title {
  font-family: var(--font-mono);
  font-size: 2.3rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 10px;
  text-shadow: 0 0 20px rgba(6, 182, 212, 0.4);
}

.page-updated {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--text-dim);
}

.page-content {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.98rem;
  line-height: 1.8;
}

.page-content h2 {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  color: #ffffff;
  margin: 34px 0 14px;
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(6, 182, 212, 0.2);
}

.page-content h3 {
  font-family: var(--font-mono);
  font-size: 1.12rem;
  color: var(--primary-bright);
  margin: 22px 0 10px;
}

.page-content p {
  margin-bottom: 16px;
}

.page-content ul, .page-content ol {
  margin: 0 0 20px 24px;
}

.page-content li {
  margin-bottom: 8px;
}

.highlight-box {
  background: rgba(6, 182, 212, 0.08);
  border-left: 3px solid var(--primary-bright);
  padding: 16px 20px;
  border-radius: 0 4px 4px 0;
  margin: 22px 0;
  color: #ffffff;
}

.warning-box {
  background: rgba(239, 68, 68, 0.08);
  border-left: 3px solid var(--danger);
  padding: 16px 20px;
  border-radius: 0 4px 4px 0;
  margin: 22px 0;
  color: #fca5a5;
}

.sitemap-group {
  margin-bottom: 34px;
}

.sitemap-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  list-style: none;
  margin: 16px 0 0 0 !important;
}

.sitemap-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 16px 18px;
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  text-decoration: none;
  transition: all 0.2s ease;
}

.sitemap-card:hover {
  border-color: var(--primary-bright);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.25);
}

.sitemap-card-title {
  color: #ffffff;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sitemap-card-desc {
  color: var(--text-dim);
  font-size: 0.82rem;
}

/* ==========================================================================
   SEO 文章与深度专栏专用排版组件 (阅读体验与权重优化)
   ========================================================================== */

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--primary-bright);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
  text-shadow: 0 0 6px var(--primary);
}

.breadcrumb-separator {
  color: rgba(255, 255, 255, 0.3);
}

.article-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.article-tags-wrap {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.article-tag {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  padding: 3px 10px;
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--primary-bright);
}

.article-meta-info {
  display: flex;
  align-items: center;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-top: 14px;
  flex-wrap: wrap;
}

.article-meta-info span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.article-body {
  color: rgba(255, 255, 255, 0.88);
  font-size: 1.02rem;
  line-height: 1.85;
}

.article-body h2 {
  font-family: var(--font-mono);
  font-size: 1.45rem;
  color: #ffffff;
  margin: 38px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(6, 182, 212, 0.2);
  text-shadow: 0 0 12px rgba(6, 182, 212, 0.3);
}

.article-body h3 {
  font-family: var(--font-mono);
  font-size: 1.18rem;
  color: var(--primary-bright);
  margin: 26px 0 12px;
}

.article-body p {
  margin-bottom: 18px;
}

.article-body strong {
  color: #ffffff;
}

.article-body ul, .article-body ol {
  margin: 0 0 22px 24px;
}

.article-body li {
  margin-bottom: 10px;
}

.article-body a {
  color: var(--primary-bright);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
}

.article-body a:hover {
  color: #ffffff;
  text-shadow: 0 0 8px var(--primary);
}

.article-cta-box {
  background: rgba(5, 17, 38, 0.95);
  border: 1px solid var(--primary);
  border-radius: 4px;
  padding: 30px;
  margin: 40px 0;
  text-align: center;
  box-shadow: 0 0 25px rgba(6, 182, 212, 0.25);
}

.article-cta-box h3 {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  color: #ffffff;
  margin-bottom: 10px;
  text-shadow: 0 0 12px rgba(6, 182, 212, 0.5);
}

.article-cta-box p {
  color: var(--text-dim);
  font-size: 0.92rem;
  margin-bottom: 20px;
}

.article-grid-section {
  margin-top: 50px;
  padding-top: 40px;
  border-top: 1px solid var(--border-color);
}

.article-card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.25s ease;
  text-decoration: none;
}

.article-card:hover {
  border-color: var(--primary-bright);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.3);
}

.article-card-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--primary-bright);
  margin-bottom: 8px;
}

.article-card-title {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.45;
  margin-bottom: 10px;
}

.article-card-excerpt {
  color: var(--text-dim);
  font-size: 0.82rem;
  line-height: 1.6;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px dashed rgba(6, 182, 212, 0.2);
  padding-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-dim);
}

@media (max-width: 1024px) {
  .article-card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .article-card-grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   响应式媒体查询 (@media) · 手机端自适应单栏
   ========================================================================== */

@media (max-width: 1024px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .hero-left {
    text-align: center;
  }

  .hero-subhead {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hero-headline {
    font-size: 2.2rem;
  }

  .hero-stats {
    grid-template-columns: 1fr;
    padding: 16px;
  }

  .stat-item {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
  }

  .stat-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }

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

  .media-ai-banner {
    padding: 22px 16px;
  }

  .media-ai-grid {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
  }

  .reviews-grid {
    grid-template-columns: 1fr;
  }

  .cta-box {
    padding: 32px 18px;
  }

  .footer-nav {
    flex-direction: column;
    gap: 14px;
  }

  .sitemap-list {
    grid-template-columns: 1fr;
  }

  .rack-stage {
    width: 280px;
    height: 280px;
  }
  
  .stream-svg {
    display: none; /* 极窄屏幕隐藏外部光线，保持机柜精简居中 */
  }
}

/* ========================================================
   无障碍 (WCAG) 与交互细节优化 (Accessibility & Motion)
   ======================================================== */

/* 1. 键盘访问：跳转到主要内容入口 */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--primary-bright);
  color: #020617;
  padding: 0.75rem 1.25rem;
  font-weight: 700;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  border-radius: 4px;
  z-index: 99999;
  text-decoration: none;
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.6);
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 1rem;
  outline: 2px solid #ffffff;
}

/* 2. 避免固定页眉遮挡锚点目标 */
section[id], [id] {
  scroll-margin-top: 85px;
}

/* 3. 长文本换行防护，避免撑破移动端布局 */
body, p, h1, h2, h3, h4, h5, h6, .card, .article-content, .wiki-card {
  overflow-wrap: break-word;
  word-break: break-word;
}

/* 4. 触控目标底线尺寸保障 (至少 44px) */
.btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
@media (max-width: 768px) {
  .nav-links a,
  .footer-link {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }
}

/* 5. 减弱动效响应 (prefers-reduced-motion) */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .cyber-grid-plane,
  .rack-cabinet,
  .led-dot,
  .load-bar,
  .cyber-orb {
    animation: none !important;
  }
}

/* 6. 套餐语义表格与移动端横向原生滚动容器 */
.pricing-table-container {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-top: 2.5rem;
  border: 1px solid rgba(6, 182, 212, 0.25);
  border-radius: 6px;
  background: rgba(15, 23, 42, 0.7);
  box-shadow: 0 0 20px rgba(2, 6, 23, 0.8), inset 0 0 15px rgba(6, 182, 212, 0.05);
}
.pricing-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}
.pricing-table caption {
  caption-side: top;
  text-align: left;
  padding: 1rem 1.25rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--primary-bright);
  font-weight: 700;
  letter-spacing: 0.05em;
  border-bottom: 1px solid rgba(6, 182, 212, 0.15);
}
.pricing-table th, .pricing-table td {
  padding: 0.9rem 1.25rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.pricing-table thead th {
  background: rgba(8, 47, 73, 0.5);
  color: #ffffff;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.88rem;
}
.pricing-table tbody th {
  color: #ffffff;
  font-weight: 600;
}
.pricing-table tbody tr:hover {
  background: rgba(6, 182, 212, 0.06);
}
.pricing-table td {
  color: var(--text-dim);
}
.pricing-table .table-highlight {
  color: var(--primary-bright);
  font-weight: 700;
}

/* 7. 网站地图 (Sitemap) 特殊卡片与纯文本抓取列表样式 */
.wiki-feature-card {
  grid-column: 1 / -1;
  background: rgba(6, 182, 212, 0.08) !important;
  border-color: rgba(6, 182, 212, 0.4) !important;
}
.wiki-feature-card:hover {
  border-color: var(--primary-bright) !important;
  background: rgba(6, 182, 212, 0.15) !important;
}

.sitemap-text-links {
  margin-top: 40px;
  padding: 28px;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(6, 182, 212, 0.2);
  border-radius: 6px;
}
.sitemap-text-links h3 {
  color: var(--primary-bright);
  font-family: var(--font-mono);
  font-size: 1.15rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.sitemap-tree-list {
  list-style: square;
  padding-left: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.sitemap-tree-list li {
  color: var(--primary-bright);
}
.sitemap-tree-list li a {
  color: #e2e8f0;
  text-decoration: none;
  font-size: 0.93rem;
  line-height: 1.5;
  transition: color 0.2s ease;
}
.sitemap-tree-list li a:hover {
  color: var(--primary-bright);
  text-decoration: underline;
}