/* ===================================================================
   极速云 (Jisu Cloud) - 硬件级 PCB 微电子架构设计系统
   UI 核心提示词：
   Matte-black PCB micro-electronic UI design for hardware-grade "Jisu Cloud (极速云)".
   Palette: solder-mask matte black (#0b0c0e), immersion-gold copper traces (#f59e0b),
   conductive flux cyan-blue tracks (#00f2fe). Strictly zero generic AI icons.
   =================================================================== */

:root {
  /* 白天模式（工程精密高纯白陶瓷 PCB / 实验室蓝图底板） */
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-tertiary: #e2e8f0;
  --bg-card: rgba(255, 255, 255, 0.92);
  --bg-card-hover: #ffffff;
  --bg-glass: rgba(248, 250, 252, 0.85);
  
  --pcb-mask: #0f172a;
  --pcb-copper: #d97706; /* 沉金铜迹 */
  --pcb-cyan: #0284c7;   /* 导电通量蓝 */
  --pcb-trace: rgba(217, 119, 6, 0.25);
  --pcb-via: #b45309;
  --pcb-pad: rgba(2, 132, 199, 0.2);
  
  --text-primary: #0b0c0e;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  
  --brand-primary: #d97706;
  --brand-accent: #0284c7;
  --brand-gradient: linear-gradient(135deg, #d97706 0%, #b45309 50%, #0284c7 100%);
  --brand-glow: rgba(217, 119, 6, 0.2);
  --brand-success: #059669;
  
  --border-light: rgba(203, 213, 225, 0.9);
  --border-subtle: #e2e8f0;
  --border-highlight: rgba(217, 119, 6, 0.45);
  --border-cyan: rgba(2, 132, 199, 0.4);
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 16px -2px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 32px -4px rgba(15, 23, 42, 0.12);
  --shadow-glow: 0 0 25px rgba(217, 119, 6, 0.25);
  --shadow-cyan-glow: 0 0 20px rgba(2, 132, 199, 0.25);
  
  --radius-sm: 4px; /* PCB 硬件倒角严密利落 */
  --radius-md: 8px;
  --radius-lg: 14px;
  --radius-full: 9999px;
  
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 黑暗模式：经典哑光阻焊黑漆 PCB 沉金微电子 */
[data-theme="dark"] {
  --bg-primary: #0b0c0e;      /* 哑光阻焊黑 Solder-mask matte black */
  --bg-secondary: #111318;
  --bg-tertiary: #161922;
  --bg-card: rgba(17, 19, 24, 0.88);
  --bg-card-hover: rgba(22, 25, 34, 0.96);
  --bg-glass: rgba(11, 12, 14, 0.85);
  
  --pcb-mask: #0b0c0e;
  --pcb-copper: #f59e0b; /* 沉金线路 Immersion-gold */
  --pcb-cyan: #00f2fe;   /* 导电通量电弧 Conductive flux cyan */
  --pcb-trace: rgba(245, 158, 11, 0.22);
  --pcb-via: #f59e0b;
  --pcb-pad: rgba(0, 242, 254, 0.22);
  
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --text-light: #4b5563;
  
  --brand-primary: #f59e0b;
  --brand-accent: #00f2fe;
  --brand-gradient: linear-gradient(135deg, #f59e0b 0%, #fbbf24 40%, #00f2fe 100%);
  --brand-glow: rgba(245, 158, 11, 0.3);
  --brand-success: #10b981;
  
  --border-light: rgba(245, 158, 11, 0.16);
  --border-subtle: #1e222d;
  --border-highlight: rgba(245, 158, 11, 0.55);
  --border-cyan: rgba(0, 242, 254, 0.5);
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.6);
  --shadow-md: 0 6px 20px -2px rgba(0, 0, 0, 0.7);
  --shadow-lg: 0 16px 40px -4px rgba(0, 0, 0, 0.85);
  --shadow-glow: 0 0 30px rgba(245, 158, 11, 0.35);
  --shadow-cyan-glow: 0 0 25px rgba(0, 242, 254, 0.35);
}

/* 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: -apple-system, BlinkMacSystemFont, "Segoe UI", "SF Pro Display", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
  position: relative;
}

/* PCB 底板精密铜走线纹理背景 */
.pcb-grid-background {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background-image: 
    linear-gradient(to right, var(--pcb-trace) 1px, transparent 1px),
    linear-gradient(to bottom, var(--pcb-trace) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.6;
}

/* 导电铜迹画布 (Conductive Trace Canvas) */
#conductiveCanvas {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  width: 100%;
  height: 100%;
}

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

/* 容器布局 */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  max-width: 900px;
}

/* ===================================================================
   页眉与导航目录 (Header & Navigation Directory)
   包含首页 + 每个板块锚点 + 推荐资讯入口 + 昼夜按钮
   =================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 16px;
}

/* ASIC 芯片封装品牌 Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
  position: relative;
}

.asic-chip-package {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  border: 1.5px solid var(--pcb-copper);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  box-shadow: 0 0 12px var(--brand-glow);
  padding: 2px;
}

/* IC 引脚装饰 (Solder pins) */
.asic-chip-package::before,
.asic-chip-package::after {
  content: "";
  position: absolute;
  width: 100%;
  height: 2px;
  background: repeating-linear-gradient(to right, var(--pcb-copper) 0, var(--pcb-copper) 3px, transparent 3px, transparent 6px);
}
.asic-chip-package::before { top: -4px; left: 0; }
.asic-chip-package::after { bottom: -4px; left: 0; }

.brand-img {
  width: 32px;
  height: 32px;
  object-fit: contain;
  display: block;
  filter: drop-shadow(0 0 6px var(--brand-glow));
  transition: transform var(--transition-fast);
}

.brand-logo:hover .brand-img {
  transform: scale(1.1) rotate(4deg);
}

.brand-text-wrap {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.brand-name-gold {
  color: var(--pcb-copper);
}

.brand-subcode {
  font-size: 0.68rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  color: var(--pcb-cyan);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* 导航目录 (包含首页加每个板块 + 推荐资讯) */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 18px;
  list-style: none;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 8px 4px;
  transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--pcb-copper);
}

/* 导航底部的铜迹导轨高亮指示器 */
.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--pcb-copper);
  box-shadow: 0 0 8px var(--pcb-copper);
  transition: width var(--transition-normal);
}

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

/* 特别突出：“推荐资讯”入口 */
.nav-link-news {
  color: var(--pcb-cyan) !important;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid var(--border-cyan);
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
}

.nav-link-news:hover {
  background: rgba(0, 242, 254, 0.18);
  box-shadow: var(--shadow-cyan-glow);
  transform: translateY(-1px);
}

.nav-link-news::after {
  display: none;
}

.pulse-indicator {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--pcb-cyan);
  box-shadow: 0 0 6px var(--pcb-cyan);
  animation: pulse-ring 1.8s infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; box-shadow: 0 0 10px var(--pcb-cyan); }
  100% { transform: scale(0.95); opacity: 0.8; }
}

/* 头部操作区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 精致专业微电子质感昼夜切换按钮 */
.theme-toggle-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-primary);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: all var(--transition-normal);
  position: relative;
  outline: none;
}

.theme-toggle-btn:hover {
  border-color: var(--pcb-copper);
  box-shadow: 0 0 12px var(--brand-glow);
  color: var(--pcb-copper);
}

.theme-toggle-btn svg {
  width: 19px;
  height: 19px;
  stroke-width: 2;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease;
}

.sun-icon {
  display: block;
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.moon-icon {
  display: none;
  opacity: 0;
  transform: rotate(-90deg) scale(0.6);
}

[data-theme="dark"] .sun-icon {
  display: none;
  opacity: 0;
  transform: rotate(90deg) scale(0.6);
}

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

/* ===================================================================
   按钮系统 (微继电器接触电弧闪烁与低阻抗确认)
   =================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
  min-height: 44px;
  text-align: center;
  position: relative;
  overflow: hidden;
  font-family: inherit;
  letter-spacing: 0.02em;
}

/* 微继电器电弧闪烁动画 (Micro-relay engagement flash) */
.btn::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  transform: skewX(-25deg);
  transition: none;
}

.btn:hover::after {
  left: 150%;
  transition: all 0.6s ease;
}

.btn-primary {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 60%, #b45309 100%);
  color: #0b0c0e !important; /* 纯正沉金高反差 */
  border-color: #fbbf24;
  box-shadow: 0 0 16px rgba(245, 158, 11, 0.35);
  font-weight: 800;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 26px rgba(245, 158, 11, 0.55);
  filter: brightness(1.1);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}

.btn-secondary:hover {
  border-color: var(--pcb-copper);
  color: var(--pcb-copper);
  box-shadow: 0 0 14px var(--brand-glow);
  transform: translateY(-1px);
}

.btn-cyan {
  background: linear-gradient(135deg, #00f2fe 0%, #0284c7 100%);
  color: #0b0c0e !important;
  border-color: #38bdf8;
  box-shadow: var(--shadow-cyan-glow);
}

.btn-cyan:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 28px rgba(0, 242, 254, 0.6);
}

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

.btn-sm {
  padding: 7px 16px;
  font-size: 0.86rem;
  min-height: 38px;
}

.btn-block {
  width: 100%;
}

/* ===================================================================
   主视觉区 (Hero Section)
   包含包含品牌名的大标题 + 完整简介 + ASIC 芯片封装微缩矩阵
   =================================================================== */
.hero-section {
  padding: 70px 0 65px;
  position: relative;
  text-align: center;
}

.hardware-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border-highlight);
  padding: 6px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--pcb-copper);
  box-shadow: 0 0 16px var(--brand-glow);
  margin-bottom: 24px;
  font-family: ui-monospace, SFMono-Regular, monospace;
}

.hero-headline {
  font-size: clamp(2.3rem, 5.2vw, 3.9rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.18;
  margin-bottom: 22px;
  color: var(--text-primary);
}

.hero-headline .brand-highlight {
  color: var(--pcb-copper);
  position: relative;
  display: inline-block;
  text-shadow: 0 0 24px var(--brand-glow);
}

.hero-headline .cyan-highlight {
  color: var(--pcb-cyan);
  text-shadow: 0 0 20px var(--shadow-cyan-glow);
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 820px;
  margin: 0 auto 36px;
  line-height: 1.75;
}

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

/* 硬件级拓扑参数看板 (Hardware Telemetry Grid) */
.hardware-telemetry-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  max-width: 1060px;
  margin: 0 auto;
}

.telemetry-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 22px 18px;
  position: relative;
  transition: all var(--transition-normal);
  text-align: left;
}

.telemetry-card:hover {
  border-color: var(--pcb-copper);
  box-shadow: 0 0 20px var(--brand-glow);
  transform: translateY(-3px);
}

/* 芯片角标 Test Point */
.tp-badge {
  font-size: 0.68rem;
  font-family: ui-monospace, SFMono-Regular, monospace;
  color: var(--pcb-cyan);
  border-bottom: 1px dashed var(--border-light);
  padding-bottom: 4px;
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
}

.telemetry-val {
  font-size: 1.75rem;
  font-weight: 900;
  color: var(--text-primary);
  font-feature-settings: "tnum";
  font-family: ui-monospace, SFMono-Regular, monospace;
}

.telemetry-val.gold { color: var(--pcb-copper); }
.telemetry-val.cyan { color: var(--pcb-cyan); }

.telemetry-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===================================================================
   板块公共微电子样式
   =================================================================== */
.section {
  padding: 85px 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-secondary);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 55px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--pcb-copper);
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid var(--border-highlight);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
  font-family: ui-monospace, monospace;
}

.section-title {
  font-size: clamp(1.85rem, 3.6vw, 2.5rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===================================================================
   产品核心优势 (3个图文硬件卡片)
   =================================================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.hardware-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 34px 28px;
  position: relative;
  transition: all var(--transition-normal);
  overflow: hidden;
}

.hardware-card:hover {
  transform: translateY(-6px);
  border-color: var(--pcb-copper);
  box-shadow: 0 0 28px var(--brand-glow);
}

/* 仿真 PCB 芯片引脚边框 (Chip Package Pins) */
.hardware-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 20px;
  right: 20px;
  height: 2px;
  background: repeating-linear-gradient(to right, var(--pcb-copper) 0, var(--pcb-copper) 6px, transparent 6px, transparent 12px);
  opacity: 0.6;
}

.hardware-card-chip {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  border: 1.5px solid var(--pcb-copper);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--pcb-copper);
  margin-bottom: 22px;
  box-shadow: 0 0 12px var(--brand-glow);
}

.hardware-card:hover .hardware-card-chip {
  background: var(--pcb-copper);
  color: #0b0c0e;
  box-shadow: 0 0 20px var(--pcb-copper);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.card-desc {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 22px;
}

.hardware-spec-list {
  list-style: none;
  font-size: 0.88rem;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 1px solid var(--border-light);
  padding-top: 18px;
}

.hardware-spec-list li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.hardware-spec-list li svg {
  color: var(--pcb-cyan);
  flex-shrink: 0;
}

/* ===================================================================
   流媒体图卡板块 (Streaming Cards)
   =================================================================== */
.streaming-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-bottom: 30px;
}

.streaming-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 24px 18px;
  text-align: center;
  transition: all var(--transition-normal);
  position: relative;
}

.streaming-card:hover {
  transform: translateY(-4px);
  border-color: var(--pcb-cyan);
  box-shadow: var(--shadow-cyan-glow);
}

.streaming-logo-wrap {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-sm);
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.15rem;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.netflix-bg { background: linear-gradient(135deg, #E50914 0%, #8b0000 100%); }
.disney-bg { background: linear-gradient(135deg, #113CCF 0%, #001254 100%); }
.youtube-bg { background: linear-gradient(135deg, #FF0000 0%, #8a0000 100%); }
.hbo-bg { background: linear-gradient(135deg, #5822b4 0%, #200454 100%); }
.spotify-bg { background: linear-gradient(135deg, #1DB954 0%, #0d5426 100%); }
.tiktok-bg { background: linear-gradient(135deg, #000000 0%, #00f2fe 100%); }
.prime-bg { background: linear-gradient(135deg, #00A8E1 0%, #004c66 100%); }
.appletv-bg { background: linear-gradient(135deg, #2b2b2b 0%, #000000 100%); }

.streaming-name {
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.streaming-tag {
  display: inline-block;
  font-size: 0.74rem;
  padding: 3px 8px;
  border-radius: 2px;
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid var(--border-cyan);
  color: var(--pcb-cyan);
  font-family: ui-monospace, monospace;
  white-space: nowrap;
}

.streaming-banner {
  background: var(--bg-card);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-sm);
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

/* ===================================================================
   AI 支持图卡板块 (AI Support Cards)
   =================================================================== */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.ai-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: all var(--transition-normal);
  position: relative;
}

.ai-card:hover {
  transform: translateY(-5px);
  border-color: var(--pcb-copper);
  box-shadow: 0 0 24px var(--brand-glow);
}

.ai-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.ai-icon-chip {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 900;
  font-size: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.chatgpt-bg { background: linear-gradient(135deg, #10a37f 0%, #064e3b 100%); }
.claude-bg { background: linear-gradient(135deg, #d97706 0%, #78350f 100%); }
.midjourney-bg { background: linear-gradient(135deg, #6366f1 0%, #312e81 100%); }
.gemini-bg { background: linear-gradient(135deg, #2563eb 0%, #0e7490 100%); }
.sora-bg { background: linear-gradient(135deg, #ec4899 0%, #701a75 100%); }
.perplexity-bg { background: linear-gradient(135deg, #0284c7 0%, #075985 100%); }

.ai-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
}

.ai-badge {
  font-size: 0.72rem;
  font-family: ui-monospace, monospace;
  color: var(--pcb-cyan);
}

.ai-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 16px;
}

.ai-feature-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 2px;
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid var(--border-highlight);
  color: var(--pcb-copper);
  font-family: ui-monospace, monospace;
  white-space: nowrap;
}

/* ===================================================================
   真实套餐价格对比表 (Pricing Section)
   参考网上真实主流专线机场套餐价格：月付 ¥15 / 季付 ¥42 / 年付 ¥148
   =================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  align-items: stretch;
  margin-bottom: 50px;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--pcb-copper);
  box-shadow: 0 0 28px var(--brand-glow);
}

/* 热门推荐（沉金高光封装） */
.pricing-card.featured {
  border-color: var(--pcb-copper);
  box-shadow: 0 0 32px var(--brand-glow);
  background: var(--bg-card);
}

.popular-badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: #0b0c0e;
  padding: 3px 16px;
  border-radius: 2px;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  font-family: ui-monospace, monospace;
  box-shadow: 0 0 12px var(--brand-glow);
  white-space: nowrap;
  width: max-content;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.plan-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  min-height: 42px;
  margin-bottom: 18px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 6px;
}

.currency {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--pcb-copper);
}

.price {
  font-size: 3.1rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  font-family: ui-monospace, monospace;
  line-height: 1;
}

.period {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.plan-sub-price {
  font-size: 0.8rem;
  color: var(--pcb-cyan);
  font-family: ui-monospace, monospace;
  margin-bottom: 22px;
}

.plan-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 30px;
  flex-grow: 1;
}

.plan-features-list li {
  font-size: 0.91rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.plan-features-list li svg {
  width: 17px;
  height: 17px;
  color: var(--pcb-cyan);
  flex-shrink: 0;
}

.plan-features-list li.disabled {
  color: var(--text-light);
  text-decoration: line-through;
  opacity: 0.55;
}

.plan-features-list li.disabled svg {
  color: var(--text-light);
}

/* 详细参数对比矩阵表 */
.comparison-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 30px;
  overflow-x: auto;
}

.comparison-title {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 20px;
  text-align: center;
  color: var(--text-primary);
}

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

.comparison-table th, 
.comparison-table td {
  padding: 16px 14px;
  border-bottom: 1px solid var(--border-light);
}

.comparison-table th {
  background: var(--bg-tertiary);
  font-weight: 700;
  color: var(--text-primary);
  font-family: ui-monospace, monospace;
}

.comparison-table th:first-child,
.comparison-table td:first-child {
  text-align: left;
  font-weight: 600;
  color: var(--text-secondary);
}

.comparison-table tr:hover td {
  background: rgba(245, 158, 11, 0.04);
}

.table-check {
  color: var(--pcb-copper);
  font-weight: 700;
}

/* ===================================================================
   用户评价 (Customer Testimonials)
   ================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.testimonial-card:hover {
  transform: translateY(-4px);
  border-color: var(--pcb-copper);
  box-shadow: 0 0 20px var(--brand-glow);
}

.rating-stars {
  color: var(--pcb-copper);
  display: flex;
  gap: 3px;
  margin-bottom: 12px;
}

.testimonial-text {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

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

.user-avatar {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--pcb-copper);
  color: var(--pcb-copper);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
}

.user-meta-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-primary);
}

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

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

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item.active {
  border-color: var(--pcb-copper);
  box-shadow: 0 0 16px var(--brand-glow);
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  text-align: left;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  outline: none;
  transition: color var(--transition-fast);
}

.faq-question:hover {
  color: var(--pcb-copper);
}

.faq-chevron {
  transition: transform 0.3s ease;
  flex-shrink: 0;
  color: var(--text-muted);
}

.faq-item.active .faq-chevron {
  transform: rotate(180deg);
  color: var(--pcb-copper);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out, padding 0.35s ease;
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  max-height: 350px;
  padding: 0 24px 22px;
}

/* ===================================================================
   页脚 (严格只保留四个特定标题，新页面打开)
   =================================================================== */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-light);
  padding: 42px 0 36px;
  text-align: center;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}

.footer-link {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.footer-link:hover {
  color: var(--pcb-copper);
  background: var(--bg-tertiary);
}

.footer-copy {
  font-size: 0.84rem;
  color: var(--text-muted);
}

.footer-copy a {
  color: var(--text-secondary);
}

.footer-copy a:hover {
  color: var(--pcb-copper);
}

/* ===================================================================
   独立子页面通用微电子排版 (About, Terms, Privacy, Sitemap, News)
   =================================================================== */
.page-hero {
  padding: 55px 0 38px;
  text-align: center;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-light);
}

.page-title {
  font-size: clamp(2rem, 4vw, 2.7rem);
  font-weight: 900;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.page-lead {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
}

.page-content-box {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 42px 48px;
  margin: 45px auto 75px;
  max-width: 920px;
}

.doc-section {
  margin-bottom: 38px;
}

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

.doc-heading {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.doc-heading::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 20px;
  background: var(--pcb-copper);
  border-radius: 1px;
}

.doc-text {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 14px;
}

.doc-list {
  padding-left: 22px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 14px;
}

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

.alert-box {
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  background: rgba(245, 158, 11, 0.08);
  border-left: 4px solid var(--pcb-copper);
  color: var(--text-secondary);
  font-size: 0.94rem;
  margin: 18px 0;
}

.alert-box.warning {
  background: rgba(239, 68, 68, 0.08);
  border-left-color: #ef4444;
}

.node-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 18px;
}

.node-item {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 16px;
  text-align: center;
}

.node-name {
  font-weight: 700;
  font-size: 0.98rem;
  margin-bottom: 4px;
}

.node-specs {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: ui-monospace, monospace;
}

/* 推荐资讯专用卡片排版 */
.news-article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px;
  margin-bottom: 24px;
  transition: all var(--transition-normal);
}

.news-article-card:hover {
  border-color: var(--pcb-cyan);
  box-shadow: var(--shadow-cyan-glow);
  transform: translateY(-3px);
}

.news-meta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  font-size: 0.82rem;
  font-family: ui-monospace, monospace;
}

.news-category-tag {
  color: var(--pcb-copper);
  background: rgba(245, 158, 11, 0.1);
  padding: 2px 8px;
  border-radius: 2px;
  font-weight: 700;
}

.news-date {
  color: var(--text-muted);
}

.news-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.news-summary {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

.news-readmore {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--pcb-cyan);
}

/* 网站地图链接卡片 */
.sitemap-links {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 14px;
}

.sitemap-link-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 15px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  font-size: 0.92rem;
  transition: all var(--transition-fast);
}

.sitemap-link-card:hover {
  border-color: var(--pcb-copper);
  background: var(--bg-card-hover);
  transform: translateX(4px);
  color: var(--pcb-copper);
}

/* ===================================================================
   长篇深度 SEO 科普文章专用排版 (Article Layout, TOC, FAQ, Related)
   =================================================================== */
.article-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-bottom: 22px;
  font-family: ui-monospace, SFMono-Regular, monospace;
}

.article-breadcrumbs a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.article-breadcrumbs a:hover {
  color: var(--pcb-copper);
}

.article-header {
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 24px;
}

.article-main-title {
  font-size: clamp(1.8rem, 3.8vw, 2.5rem);
  font-weight: 900;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: ui-monospace, monospace;
}

.article-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* 目录盒子 (Table of Contents) */
.article-toc {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-highlight);
  border-left: 4px solid var(--pcb-copper);
  border-radius: var(--radius-sm);
  padding: 22px 26px;
  margin: 30px 0 40px;
}

.toc-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--pcb-copper);
  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: 0.95rem;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

.toc-list li a:hover {
  color: var(--pcb-copper);
  transform: translateX(4px);
}

.toc-sublist {
  list-style: none;
  padding-left: 20px;
  margin-top: 6px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.toc-sublist li a {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: normal;
}

.toc-sublist li a:hover {
  color: var(--pcb-cyan);
}

/* 文章正文排版 */
.article-body {
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--text-secondary);
}

.article-body h2 {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 44px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-body h2::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 22px;
  background: var(--pcb-copper);
  border-radius: 1px;
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 28px 0 14px;
}

.article-body p {
  margin-bottom: 20px;
}

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

.article-body ul, .article-body ol {
  padding-left: 24px;
  margin-bottom: 24px;
}

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

.article-body a {
  color: var(--pcb-copper);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body a:hover {
  color: var(--pcb-cyan);
}

/* 重点标注卡片 */
.callout-box {
  background: var(--bg-card);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin: 26px 0;
  box-shadow: 0 0 16px var(--brand-glow);
}

.callout-box.cyan {
  border-color: var(--border-cyan);
  box-shadow: var(--shadow-cyan-glow);
}

.callout-title {
  font-weight: 800;
  font-size: 1rem;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--pcb-copper);
}

.callout-box.cyan .callout-title {
  color: var(--pcb-cyan);
}

/* 节点对照简表 */
.article-table-wrap {
  overflow-x: auto;
  margin: 28px 0;
}

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

.article-table th, .article-table td {
  padding: 14px 16px;
  border: 1px solid var(--border-light);
}

.article-table th {
  background: var(--bg-tertiary);
  font-weight: 700;
  color: var(--text-primary);
  font-family: ui-monospace, monospace;
}

.article-table tr:nth-child(even) td {
  background: rgba(245, 158, 11, 0.02);
}

/* 文章内置 CTA 卡片 */
.article-cta-card {
  background: var(--bg-card);
  border: 1.5px solid var(--pcb-copper);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  margin: 45px 0;
  text-align: center;
  box-shadow: 0 0 30px var(--brand-glow);
}

.article-cta-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.article-cta-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 22px;
}

/* 文章专属 FAQ 区块 */
.article-faq-section {
  margin: 50px 0 40px;
  border-top: 1px solid var(--border-light);
  padding-top: 36px;
}

.article-faq-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 22px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-faq-item {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 18px 22px;
  margin-bottom: 14px;
}

.article-faq-q {
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.article-faq-a {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* 相关阅读区块 (Related Articles) */
.related-articles-section {
  margin: 45px 0 20px;
  border-top: 1px solid var(--border-light);
  padding-top: 32px;
}

.related-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 18px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.related-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-fast);
}

.related-card:hover {
  border-color: var(--pcb-copper);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 0 16px var(--brand-glow);
}

.related-card-title {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.5;
}

.related-card-meta {
  font-size: 0.8rem;
  color: var(--pcb-cyan);
  font-family: ui-monospace, monospace;
}

/* ===================================================================
   响应式媒体查询 (Mobile & Tablet)
   =================================================================== */
@media (max-width: 1024px) {
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }
  .streaming-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .ai-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
    max-width: 580px;
    margin: 0 auto;
  }
  .hardware-telemetry-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nav-menu {
    gap: 10px;
  }
  .nav-link {
    font-size: 0.84rem;
  }
}

@media (max-width: 820px) {
  .header-content {
    height: 64px;
  }
  .nav-menu {
    display: none; /* 移动端保持极简顶栏 */
  }
  .hero-section {
    padding: 42px 0 36px;
  }
  .hardware-telemetry-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .advantages-grid {
    grid-template-columns: 1fr;
  }
  .streaming-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .ai-grid {
    grid-template-columns: 1fr;
  }
  .btn-lg {
    width: 100%;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .hero-cta-group .btn {
    width: 100%;
  }
  .footer-nav {
    flex-direction: column;
    gap: 14px;
  }
  .page-content-box {
    padding: 24px 18px;
    margin: 25px auto 50px;
  }
  .sitemap-links {
    grid-template-columns: 1fr;
  }
  .node-grid {
    grid-template-columns: 1fr;
  }
  .streaming-banner {
    flex-direction: column;
    text-align: center;
  }
}