/* ==========================================================================
   木瓜云 (muguacloud.lat) - 核心样式表 2.0
   3D BGP 自愈网络 · 赛博工业服务器机架风格 · 纯原生秒开 · 极速昼夜平滑过渡
   ========================================================================== */

:root {
  /* 基础配色 - 浅色模式 (白天标准) */
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-glass: rgba(255, 255, 255, 0.88);
  --bg-chassis: #0f172a;
  
  --border-subtle: #e2e8f0;
  --border-medium: #cbd5e1;
  --border-focus: #6366f1;
  
  --text-main: #090d16;
  --text-body: #334155;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  
  /* 科技高能色谱：深靛蓝至星际蓝 (#6366f1 -> #3b82f6) */
  --brand-indigo: #6366f1;
  --brand-blue: #3b82f6;
  --brand-gradient: linear-gradient(135deg, #6366f1 0%, #4f46e5 50%, #3b82f6 100%);
  --brand-gradient-hover: linear-gradient(135deg, #4f46e5 0%, #3b82f6 50%, #2563eb 100%);
  --brand-glow: rgba(99, 102, 241, 0.25);
  --brand-light: rgba(99, 102, 241, 0.08);
  
  /* 硬件 LED 与高能光子指示 */
  --led-green: #10b981;
  --led-green-glow: rgba(16, 185, 129, 0.4);
  --led-amber: #f59e0b;
  --laser-cyan: #06b6d4;
  
  /* 阴影体系 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 16px 32px -4px rgba(15, 23, 42, 0.12);
  --shadow-hover: 0 20px 35px -6px rgba(99, 102, 241, 0.18);
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --container-max: 1220px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
}

/* 深色模式：深渊赛博黑 (#05070a) · 钛金灰机箱 · 荧光翡翠绿 LED */
[data-theme="dark"] {
  --bg-primary: #05070a;
  --bg-surface: #0a0f18;
  --bg-card: #0e1524;
  --bg-card-hover: #141e33;
  --bg-glass: rgba(5, 7, 10, 0.88);
  --bg-chassis: #090e17;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.15);
  --border-focus: #818cf8;
  
  --text-main: #f8fafc;
  --text-body: #cbd5e1;
  --text-muted: #8492a6;
  --text-inverse: #05070a;
  
  --brand-indigo: #818cf8;
  --brand-blue: #60a5fa;
  --brand-gradient: linear-gradient(135deg, #6366f1 0%, #4f46e5 50%, #3b82f6 100%);
  --brand-gradient-hover: linear-gradient(135deg, #818cf8 0%, #6366f1 50%, #60a5fa 100%);
  --brand-glow: rgba(99, 102, 241, 0.35);
  --brand-light: rgba(99, 102, 241, 0.15);
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.6);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.7);
  --shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.85);
  --shadow-hover: 0 20px 40px rgba(99, 102, 241, 0.25);
}

/* 全局重置 */
*, *::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: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-body);
  line-height: 1.65;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
}

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

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

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

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

/* 背景科技星云光晕 */
.bg-glow-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
  z-index: -1;
}

.glow-orb-1 {
  position: absolute;
  top: -160px;
  right: 5%;
  width: 580px;
  height: 580px;
  background: radial-gradient(circle, var(--brand-glow) 0%, rgba(99, 102, 241, 0) 70%);
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.8;
}

.glow-orb-2 {
  position: absolute;
  top: 520px;
  left: -180px;
  width: 620px;
  height: 620px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.12) 0%, rgba(59, 130, 246, 0) 70%);
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.7;
}

/* ==========================================================================
   导航栏 Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 1000;
  background-color: var(--bg-glass);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  transition: opacity var(--transition-fast);
}

.brand-logo:hover {
  opacity: 0.9;
}

.logo-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #4fc3f7 0%, #818cf8 100%);
  border-radius: 11px;
  color: #0b0f19;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 1.25rem;
  font-weight: 900;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.28);
  flex-shrink: 0;
  user-select: none;
}

.brand-text {
  display: flex;
  align-items: baseline;
  font-weight: 800;
  color: var(--text-main);
}

.brand-suffix {
  font-weight: 800;
  opacity: 0.95;
}

/* 导航目录：首页 + 板块锚点 + 推荐资讯 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  list-style: none;
}

.nav-link {
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--text-muted);
  position: relative;
  padding: 8px 2px;
  transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--brand-indigo);
}

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

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

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

/* 精致半透明质感昼夜切换按钮 */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
  border-color: var(--border-focus);
  box-shadow: 0 0 14px var(--brand-glow);
  transform: translateY(-1px);
}

.theme-icon-sun, .theme-icon-moon {
  width: 20px;
  height: 20px;
  position: absolute;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.theme-icon-sun { opacity: 1; transform: rotate(0) scale(1); }
.theme-icon-moon { opacity: 0; transform: rotate(90deg) scale(0.5); }

[data-theme="dark"] .theme-icon-sun { opacity: 0; transform: rotate(-90deg) scale(0.5); }
[data-theme="dark"] .theme-icon-moon { opacity: 1; transform: rotate(0) scale(1); }

/* ==========================================================================
   按钮系统规范
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.88rem;
}

.btn-lg {
  padding: 15px 34px;
  font-size: 1.08rem;
  letter-spacing: 0.01em;
}

.btn-primary {
  background: var(--brand-gradient);
  color: #ffffff !important;
  box-shadow: 0 6px 20px var(--brand-glow);
  border: 1px solid transparent;
}

.btn-primary:hover {
  background: var(--brand-gradient-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-medium);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  border-color: var(--brand-indigo);
  color: var(--brand-indigo);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

/* ==========================================================================
   主视觉区 (Hero Section) - 3D 赛博网络机架布局
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 72px 0 70px;
  overflow: hidden;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
}

/* 顶部暗边框状态标签 */
.status-badge-inline {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--led-green);
  margin-bottom: 22px;
}

/* 物理发光与余晖衰减动画 */
.pulsing-led {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--led-green);
  box-shadow: 0 0 10px var(--led-green), 0 0 20px var(--led-green-glow);
  animation: phosphorGlow 2.4s infinite ease-in-out;
}

@keyframes phosphorGlow {
  0%, 100% {
    opacity: 1;
    box-shadow: 0 0 10px var(--led-green), 0 0 20px var(--led-green-glow);
  }
  50% {
    opacity: 0.35;
    box-shadow: 0 0 3px var(--led-green);
  }
}

.hero-title {
  font-size: 3.15rem;
  line-height: 1.2;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero-title .text-gradient {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.12rem;
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: 28px;
  max-width: 580px;
}

/* 元数据读取状态栏 */
.hero-metadata-box {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 12px 18px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 32px;
  width: fit-content;
  box-shadow: var(--shadow-sm);
}

.metadata-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-body);
  font-weight: 500;
}

.metadata-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--brand-indigo);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

/* ==========================================================================
   3D CNC 机箱与硬件机架控制台 (纯 CSS 工业质感)
   ========================================================================== */
.cnc-chassis-wrapper {
  perspective: 1200px;
}

.cnc-machine-chassis {
  position: relative;
  background: #090e17;
  border: 1px solid #1e293b;
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: 0 24px 48px -12px rgba(5, 7, 10, 0.7), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  transform: rotateY(-3deg) rotateX(2deg);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  overflow: hidden;
}

.cnc-machine-chassis:hover {
  transform: rotateY(0) rotateX(0) translateY(-4px);
  box-shadow: 0 30px 60px -10px var(--brand-glow), inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

/* 激光流转导管 (Hover 激发高能光子脉冲) */
.laser-conduit {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: transparent;
  overflow: hidden;
}

.laser-pulse-photon {
  position: absolute;
  top: 0;
  left: -50%;
  width: 50%;
  height: 100%;
  background: linear-gradient(90deg, transparent, #38bdf8, #818cf8, transparent);
  animation: laserPulse 4s infinite linear;
}

@keyframes laserPulse {
  0% { left: -50%; }
  100% { left: 150%; }
}

.chassis-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 20px;
}

.rack-unit-label {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.76rem;
  color: #94a3b8;
  letter-spacing: 0.06em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.chassis-leds-group {
  display: flex;
  gap: 8px;
}

.chassis-led {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}
.chassis-led.green { background: #10b981; box-shadow: 0 0 8px #10b981; }
.chassis-led.amber { background: #f59e0b; box-shadow: 0 0 6px #f59e0b; }
.chassis-led.blue { background: #3b82f6; box-shadow: 0 0 6px #3b82f6; }

/* 通风散热网孔纹理 */
.ventilation-grille {
  height: 28px;
  margin-bottom: 18px;
  background: radial-gradient(#1e293b 25%, transparent 26%), radial-gradient(#0f172a 25%, transparent 26%);
  background-size: 7px 7px;
  background-position: 0 0, 3.5px 3.5px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

/* 中央高亮状态插槽 */
.luminous-status-slot {
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(99, 102, 241, 0.4);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  margin-bottom: 20px;
  box-shadow: inset 0 0 16px rgba(99, 102, 241, 0.15), 0 0 20px rgba(99, 102, 241, 0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.status-slot-content {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.slot-tag {
  font-size: 0.72rem;
  text-transform: uppercase;
  color: #38bdf8;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.slot-value {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.95rem;
  color: #ffffff;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 内部布线与光纤状态端口 */
.internal-routing-bays {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.optical-port-bay {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 8px;
  transition: all var(--transition-fast);
}

.optical-port-bay:hover {
  border-color: rgba(99, 102, 241, 0.5);
  background: rgba(15, 23, 42, 0.9);
}

.bay-left {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #f8fafc;
  font-size: 0.88rem;
  font-weight: 600;
}

.port-indicator {
  width: 10px;
  height: 10px;
  background: #10b981;
  border-radius: 2px;
  box-shadow: 0 0 8px #10b981;
}

.bay-right {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: 0.82rem;
  color: #38bdf8;
}

/* 底部中央极简药丸滚动指示器 */
.hero-scroll-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-top: 36px;
  cursor: pointer;
  user-select: none;
}

.pill-capsule {
  width: 22px;
  height: 38px;
  border: 2px solid var(--border-medium);
  border-radius: var(--radius-full);
  position: relative;
  display: flex;
  justify-content: center;
  transition: border-color var(--transition-fast);
}

.hero-scroll-indicator:hover .pill-capsule {
  border-color: var(--brand-indigo);
}

.pill-dot {
  width: 6px;
  height: 6px;
  background-color: var(--brand-indigo);
  border-radius: 50%;
  position: absolute;
  top: 6px;
  animation: pillBounce 2s infinite ease-in-out;
}

@keyframes pillBounce {
  0% { top: 6px; opacity: 1; }
  60% { top: 22px; opacity: 0.3; }
  100% { top: 6px; opacity: 1; }
}

.scroll-text {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.05em;
}

/* ==========================================================================
   通用板块标题
   ========================================================================== */
.section-padding {
  padding: 88px 0;
}

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--brand-indigo);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ==========================================================================
   核心优势卡片 (3 个图文卡片)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

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

.feature-icon-box {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--brand-light);
  color: var(--brand-indigo);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  transition: transform var(--transition-fast);
}

.feature-card:hover .feature-icon-box {
  transform: scale(1.08) rotate(3deg);
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.feature-text {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.feature-specs {
  list-style: none;
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
}

.feature-specs li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-body);
  margin-bottom: 8px;
}

.feature-specs svg {
  color: var(--led-green);
  flex-shrink: 0;
}

/* ==========================================================================
   流媒体图卡 & AI 支持图卡
   ========================================================================== */
.showcase-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.showcase-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 38px;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

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

.showcase-streaming::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #ef4444, #f97316, #ec4899);
}

.showcase-ai::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #10b981, #06b6d4, #6366f1);
}

.showcase-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 18px;
  width: fit-content;
}

.showcase-streaming .showcase-badge {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
}

.showcase-ai .showcase-badge {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
}

.showcase-title {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
  line-height: 1.3;
}

.showcase-desc {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 28px;
}

.brand-chips-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}

.brand-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 14px 8px;
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  text-align: center;
  transition: all var(--transition-fast);
}

.brand-chip:hover {
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.brand-chip-icon {
  width: 28px;
  height: 28px;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-chip-name {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-main);
}

.showcase-card-footer {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
}

.feature-check-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-body);
}

.feature-check-list span {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ==========================================================================
   套餐价格对比表 (参考网上真实套餐市场价格)
   ========================================================================== */
.pricing-section {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

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

.pricing-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
}

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

.pricing-card.featured {
  background: var(--bg-card);
  border: 2px solid var(--brand-indigo);
  box-shadow: var(--shadow-hover);
  transform: scale(1.02);
}

.pricing-card.featured:hover {
  transform: scale(1.04) translateY(-4px);
}

.featured-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--brand-gradient);
  color: #ffffff;
  padding: 4px 16px;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  letter-spacing: 0.04em;
  box-shadow: 0 4px 12px var(--brand-glow);
  white-space: nowrap;
}

.plan-name {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  min-height: 42px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 8px;
}

.price-currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--brand-indigo);
}

.price-amount {
  font-size: 3rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
}

.price-period {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.price-original {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: line-through;
  margin-bottom: 20px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-subtle);
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 34px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.94rem;
  color: var(--text-body);
}

.plan-features li svg {
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--led-green);
}

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

.pricing-btn-wrap .btn {
  width: 100%;
}

/* ==========================================================================
   用户评价与真实口碑
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.testimonial-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.testimonial-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-md);
}

.stars-row {
  display: flex;
  gap: 4px;
  color: #f59e0b;
  margin-bottom: 16px;
}

.testimonial-quote {
  font-size: 0.98rem;
  color: var(--text-body);
  line-height: 1.65;
  margin-bottom: 24px;
  flex-grow: 1;
  font-style: normal;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--brand-light);
  color: var(--brand-indigo);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}

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

.author-role {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================================================
   常见问题解答 (FAQ)
   ========================================================================== */
.faq-wrap {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--border-medium);
}

.faq-item[open] {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  list-style: none;
  user-select: none;
}

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

.faq-arrow {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
}

.faq-item[open] .faq-arrow {
  transform: rotate(180deg);
  color: var(--brand-indigo);
}

.faq-answer {
  padding: 0 24px 22px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   底部转化横幅 (BGP 机箱光电横幅)
   ========================================================================== */
.bottom-banner-section {
  padding: 60px 0 80px;
}

.banner-card {
  background: var(--brand-gradient);
  border-radius: var(--radius-lg);
  padding: 56px 48px;
  text-align: center;
  color: #ffffff;
  box-shadow: 0 20px 40px var(--brand-glow);
  position: relative;
  overflow: hidden;
}

.banner-title {
  font-size: 2.35rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.banner-desc {
  font-size: 1.12rem;
  opacity: 0.95;
  max-width: 620px;
  margin: 0 auto 36px;
}

.banner-btn {
  background: #ffffff !important;
  color: #4f46e5 !important;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  font-weight: 700;
}

.banner-btn:hover {
  background: #f8fafc !important;
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
}

/* ==========================================================================
   页脚 Footer (严格遵循：只保留四个标题，在新页面打开)
   ========================================================================== */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 48px 0 36px;
  transition: background-color var(--transition-normal);
}

.footer-nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  list-style: none;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-nav-link {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-body);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.footer-nav-link:hover {
  color: var(--brand-indigo);
  background: var(--brand-light);
}

.footer-bottom {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-bottom p {
  margin-bottom: 6px;
}

/* ==========================================================================
   推荐资讯 (insights.html) 样式
   ========================================================================== */
.insights-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.insight-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 34px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.insight-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-hover);
}

.insight-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.insight-tag {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 10px;
  background: var(--brand-light);
  color: var(--brand-indigo);
  border-radius: var(--radius-full);
}

.insight-date {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.insight-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 14px;
}

.insight-summary {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 24px;
  flex-grow: 1;
}

.insight-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
}

.reading-time {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.insight-link {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--brand-indigo);
}

.insight-link:hover {
  text-decoration: underline;
}

.server-chassis-banner {
  background: #090e17;
  border: 1px solid #1e293b;
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4);
}

/* ==========================================================================
   独立文章与合规排版
   ========================================================================== */
.page-header {
  padding: 60px 0 40px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 48px;
}

.page-title {
  font-size: 2.45rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.page-lead {
  font-size: 1.08rem;
  color: var(--text-muted);
}

.legal-article, .about-article, .sitemap-article {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 60px;
}

.article-section {
  margin-bottom: 40px;
}

.article-section:last-child {
  margin-bottom: 0;
}

.article-h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 10px;
}

.article-p {
  font-size: 1rem;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 16px;
}

.article-list {
  margin-left: 20px;
  margin-bottom: 16px;
  color: var(--text-body);
  line-height: 1.8;
}

.article-list li {
  margin-bottom: 8px;
}

.callout-box {
  background: var(--brand-light);
  border-left: 4px solid var(--brand-indigo);
  padding: 18px 22px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 20px 0;
  font-size: 0.95rem;
  color: var(--text-main);
}

.sitemap-group {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.sitemap-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sitemap-card h3 {
  font-size: 1.2rem;
  color: var(--text-main);
  margin-bottom: 14px;
}

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

.sitemap-links a {
  color: var(--brand-indigo);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ==========================================================================
   深度长文 SEO 专栏排版 (TOC 目录 · 核心正文 · 常见问答 · 相关阅读)
   ========================================================================== */
.article-wrap {
  max-width: 900px;
  margin: 0 auto;
}

.article-main-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 50px 48px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 60px;
}

.article-header-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.article-category-badge {
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 12px;
  background: var(--brand-light);
  color: var(--brand-indigo);
  border-radius: var(--radius-full);
}

.article-date-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.article-h1 {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-main);
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

/* 文章导读目录 (Table of Contents) */
.article-toc {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-left: 4px solid var(--brand-indigo);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 24px 28px;
  margin: 32px 0 44px;
}

.toc-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-left: 4px;
}

.toc-list li a {
  font-size: 0.94rem;
  color: var(--text-body);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color var(--transition-fast);
}

.toc-list li a:hover {
  color: var(--brand-indigo);
  text-decoration: underline;
}

/* 核心文章排版 */
.article-body h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 44px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 28px 0 14px;
}

.article-body p {
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--text-body);
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  margin: 0 0 24px 24px;
  color: var(--text-body);
  line-height: 1.85;
}

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

.article-body strong {
  color: var(--text-main);
  font-weight: 700;
}

/* 文章表格 */
.data-table-wrap {
  overflow-x: auto;
  margin: 28px 0 36px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.data-table th {
  background: var(--bg-primary);
  color: var(--text-main);
  padding: 14px 18px;
  font-weight: 700;
  border-bottom: 1px solid var(--border-subtle);
}

.data-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-body);
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tr:hover td {
  background: var(--bg-card-hover);
}

/* 文章问答模块 (FAQ) */
.article-faq-box {
  margin: 48px 0;
  padding-top: 32px;
  border-top: 2px dashed var(--border-subtle);
}

.faq-card-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  margin-bottom: 16px;
}

.faq-card-item h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}

.faq-card-item p {
  margin-bottom: 0;
  font-size: 0.95rem;
  line-height: 1.7;
}

/* 相关阅读模块 (Related Reading) */
.related-reading-box {
  margin-top: 50px;
  padding-top: 36px;
  border-top: 1px solid var(--border-subtle);
}

.related-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 22px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.related-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
}

.related-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

.related-card h5 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.4;
}

.related-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 12px;
  flex-grow: 1;
}

.related-card .read-more {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--brand-indigo);
}

/* ==========================================================================
   移动端响应式 (@media)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .cnc-machine-chassis {
    transform: none;
    max-width: 580px;
    margin: 0 auto;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }
  
  .pricing-card.featured {
    transform: none;
  }
  
  .pricing-card.featured:hover {
    transform: translateY(-4px);
  }
  
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .showcase-grid {
    grid-template-columns: 1fr;
  }
  
  .insights-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .hero-section {
    padding: 36px 0 40px;
  }
  
  .hero-title {
    font-size: 2.2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .hero-metadata-box {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    width: 100%;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-cta-group .btn {
    width: 100%;
    min-height: 50px;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .showcase-card {
    padding: 24px;
  }
  
  .brand-chips-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  
  .banner-card {
    padding: 36px 20px;
  }
  
  .banner-title {
    font-size: 1.8rem;
  }
  
  .footer-nav-list {
    flex-direction: column;
    gap: 16px;
  }
  
  .legal-article, .about-article, .sitemap-article {
    padding: 24px;
  }
  
  .sitemap-group {
    grid-template-columns: 1fr;
  }
}