/* ==========================================================================
   极速云 (jisu-cloud.homes) - 硬件级微电子 PCB 风格样式表
   Matte-black PCB Micro-Electronic UI Design (#0b0c0e / Immersion Gold #f59e0b / Conductive Cyan #00f2fe)
   ========================================================================== */

/* 1. 核心色彩变量定义 (硬件级微电子配色体系) */
:root {
  /* 昼间模式：洁净室白陶瓷覆铜 PCB (Cleanroom Ceramic PCB) */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.92);
  --bg-card-hover: #ffffff;
  --bg-tag: rgba(2, 132, 199, 0.08);
  --border-color: rgba(203, 213, 225, 0.9);
  --border-hover: rgba(217, 119, 6, 0.8);
  
  --text-primary: #0b0f19;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  
  --pcb-copper-gold: #d97706;
  --pcb-gold-glow: rgba(217, 119, 6, 0.35);
  --pcb-cyan-track: #0284c7;
  --pcb-cyan-glow: rgba(2, 132, 199, 0.35);
  --pcb-substrate-grid: rgba(148, 163, 184, 0.12);
  --pcb-chip-bg: #f1f5f9;
  --pcb-silk-screen: #0f172a;
  
  --accent-gradient: linear-gradient(135deg, #d97706 0%, #0284c7 100%);
  --gold-gradient: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  --cyan-gradient: linear-gradient(135deg, #00f2fe 0%, #0284c7 100%);
  --hero-glow: radial-gradient(circle at 50% 12%, rgba(217, 119, 6, 0.12) 0%, rgba(2, 132, 199, 0.06) 45%, transparent 75%);
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 8px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 28px -4px rgba(0, 0, 0, 0.1), 0 4px 8px -4px rgba(0, 0, 0, 0.06);
  --shadow-glow: 0 8px 24px -2px rgba(217, 119, 6, 0.3);
  
  --nav-bg: rgba(248, 250, 252, 0.88);
  --nav-border: rgba(203, 213, 225, 0.85);
  --toggle-bg: rgba(241, 245, 249, 0.9);
  --toggle-border: rgba(203, 213, 225, 0.8);
  --toggle-hover: rgba(226, 232, 240, 1);
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 默认/夜间黑化模式：哑光阻焊黑 PCB (Matte-Black Solder-Mask PCB) */
html[data-theme="dark"], :root {
  /* 当处于暗色或黑夜模式时的沉浸式硬件微电子风格 */
}

html[data-theme="dark"] {
  --bg-primary: #0b0c0e;
  --bg-secondary: #111317;
  --bg-card: rgba(16, 18, 22, 0.85);
  --bg-card-hover: rgba(22, 26, 32, 0.95);
  --bg-tag: rgba(0, 242, 254, 0.08);
  --border-color: rgba(245, 158, 11, 0.18);
  --border-hover: rgba(0, 242, 254, 0.7);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0b0c0e;
  
  --pcb-copper-gold: #f59e0b;
  --pcb-gold-glow: rgba(245, 158, 11, 0.4);
  --pcb-cyan-track: #00f2fe;
  --pcb-cyan-glow: rgba(0, 242, 254, 0.5);
  --pcb-substrate-grid: rgba(245, 158, 11, 0.04);
  --pcb-chip-bg: #13171f;
  --pcb-silk-screen: #f59e0b;
  
  --accent-gradient: linear-gradient(135deg, #f59e0b 0%, #00f2fe 100%);
  --gold-gradient: linear-gradient(135deg, #fbbf24 0%, #d97706 100%);
  --cyan-gradient: linear-gradient(135deg, #38bdf8 0%, #00f2fe 100%);
  --hero-glow: radial-gradient(circle at 50% 15%, rgba(245, 158, 11, 0.15) 0%, rgba(0, 242, 254, 0.08) 45%, transparent 75%);
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.6);
  --shadow-md: 0 4px 8px -1px rgba(0, 0, 0, 0.7), 0 2px 4px -2px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 14px 32px -4px rgba(0, 0, 0, 0.8), 0 4px 8px -4px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 10px 30px -4px rgba(245, 158, 11, 0.35);
  
  --nav-bg: rgba(11, 12, 14, 0.85);
  --nav-border: rgba(245, 158, 11, 0.2);
  --toggle-bg: rgba(24, 28, 35, 0.8);
  --toggle-border: rgba(245, 158, 11, 0.3);
  --toggle-hover: rgba(35, 41, 51, 1);
}

/* 2. 重置与基础设置 (PCB 网格底板与微电子排版) */
*, *::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-primary);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 硬件 PCB 覆铜网格底层纹理 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(var(--pcb-substrate-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--pcb-substrate-grid) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  z-index: 0;
}

/* 顶部高能光晕束 */
body::after {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 650px;
  background: var(--hero-glow);
  pointer-events: none;
  z-index: 0;
  transition: background 0.4s ease;
}

/* 交互式导电铜箔 Canvas 衬底 */
#pcb-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  opacity: 0.85;
}

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

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

ul {
  list-style: none;
}

/* 3. 通用容器与组件布局 */
.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

.section {
  padding: 96px 0;
  position: relative;
}

.section-title-wrap {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px auto;
}

/* PCB 丝印标记标签 (Silk-Screen Tag) */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--pcb-copper-gold);
  background: var(--bg-tag);
  border: 1px solid var(--border-color);
  padding: 5px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  letter-spacing: 1px;
  text-transform: uppercase;
  white-space: nowrap;
  position: relative;
}

.section-tag::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--pcb-cyan-track);
  box-shadow: 0 0 8px var(--pcb-cyan-track);
}

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

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* 4. 顶部硬件控制台页眉 (Header & Navbar) */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--nav-border);
  transition: var(--transition);
}

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

/* 品牌标识 (带发光 ASIC 芯片包装质感) */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.brand-logo-img {
  width: 38px;
  height: 38px;
  object-fit: contain;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.3s ease;
  filter: drop-shadow(0 0 8px rgba(245, 158, 11, 0.45));
}

.brand-logo:hover .brand-logo-img {
  transform: scale(1.1) rotate(6deg);
  filter: drop-shadow(0 0 14px rgba(0, 242, 254, 0.8));
}

.brand-name {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.1;
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-subcode {
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: 0.65rem;
  color: var(--pcb-cyan-track);
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

/* 导航目录 (包含首页、各板块锚点、新增的推荐资讯入口) */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-link {
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 4px;
  transition: var(--transition);
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0%;
  height: 2px;
  background: var(--pcb-copper-gold);
  box-shadow: 0 0 6px var(--pcb-copper-gold);
  transition: var(--transition);
  border-radius: 2px;
}

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

/* 推荐资讯高亮芯片徽标 */
.nav-link-news {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--pcb-cyan-track) !important;
}

.nav-link-news::before {
  content: "LIVE";
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: 0.625rem;
  font-weight: 700;
  padding: 1px 5px;
  border-radius: 3px;
  background: rgba(0, 242, 254, 0.15);
  border: 1px solid rgba(0, 242, 254, 0.4);
  color: var(--pcb-cyan-track);
}

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

/* 昼夜切换按钮 (微电子精密元件质感，透明玻璃拟态) */
.theme-toggle-btn {
  background: var(--toggle-bg);
  border: 1px solid var(--toggle-border);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.theme-toggle-btn:hover {
  background: var(--toggle-hover);
  border-color: var(--pcb-copper-gold);
  box-shadow: 0 0 10px var(--pcb-gold-glow);
  transform: translateY(-1px);
}

.theme-toggle-btn svg {
  width: 19px;
  height: 19px;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
}

.icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
  color: #f59e0b;
}

.icon-moon {
  position: absolute;
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
  color: #00f2fe;
}

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

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

/* 按钮体系与微电路焊盘触感 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
}

/* 沉金触点主按钮 */
.btn-primary {
  background: var(--gold-gradient);
  color: #0b0c0e !important;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.35);
  border: 1px solid rgba(251, 191, 36, 0.6);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(245, 158, 11, 0.55), 0 0 12px var(--pcb-cyan-track);
}

/* 导电银白/黑金次级线框按钮 */
.btn-outline {
  background: rgba(16, 18, 22, 0.4);
  border-color: var(--border-color);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--pcb-cyan-track);
  color: var(--pcb-cyan-track);
  box-shadow: 0 0 12px var(--pcb-cyan-glow);
  background: rgba(0, 242, 254, 0.05);
}

.btn-lg {
  padding: 14px 34px;
  font-size: 1.05rem;
  border-radius: var(--radius-sm);
}

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 8px;
}

/* 5. 醒目的主视觉区 (Hero Section - ASIC 芯片封装架构) */
.hero {
  padding: 88px 0 72px 0;
  text-align: center;
  position: relative;
}

.hero-asic-frame {
  max-width: 980px;
  margin: 0 auto;
  position: relative;
}

/* 芯片引脚与覆铜丝印铭牌 */
.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  margin-bottom: 28px;
  white-space: nowrap;
}

.hero-pill-badge {
  background: var(--gold-gradient);
  color: #0b0c0e;
  font-size: 0.725rem;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}

/* 大标题：严格包含当前品牌名“极速云” */
.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.gold-cyan-text {
  background: linear-gradient(135deg, #f59e0b 0%, #fbbf24 45%, #00f2fe 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  text-shadow: 0 0 30px rgba(245, 158, 11, 0.25);
}

/* 主视觉区详细简介 */
.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 780px;
  margin: 0 auto 40px auto;
  line-height: 1.65;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 56px;
}

/* 硬件 SLA 质量保证条 */
.hero-guarantee {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
  font-size: 0.875rem;
  color: var(--text-muted);
  font-family: ui-monospace, SFMono-Regular, monospace;
}

.guarantee-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.guarantee-item svg {
  color: var(--pcb-cyan-track);
  width: 16px;
  height: 16px;
  filter: drop-shadow(0 0 4px var(--pcb-cyan-track));
}

/* 微电子参数遥测仪表板 (Hardware Telemetry Grid) */
.hero-stats {
  margin-top: 64px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding: 28px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-md);
  position: relative;
}

/* 四角金箔定位触点 (PCB Solder Marks) */
.hero-stats::before, .hero-stats::after {
  content: "";
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--pcb-copper-gold);
  box-shadow: 0 0 6px var(--pcb-copper-gold);
}
.hero-stats::before { top: 10px; left: 10px; }
.hero-stats::after { bottom: 10px; right: 10px; }

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

.stat-code {
  font-family: ui-monospace, monospace;
  font-size: 0.7rem;
  color: var(--pcb-cyan-track);
  letter-spacing: 1px;
  margin-bottom: 2px;
}

.stat-num {
  font-size: 2.1rem;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 4px;
  font-family: ui-monospace, SFMono-Regular, monospace;
}

.stat-num span {
  color: var(--pcb-copper-gold);
  font-size: 1.4rem;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* 6. 产品核心优势 (3个微电子晶圆封装图文卡片) */
.advantages-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: var(--radius-md);
  padding: 38px 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* 顶部与边角金色微电路 trace 装饰 */
.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--pcb-copper-gold), var(--pcb-cyan-track), transparent);
  opacity: 0.5;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-lg), 0 0 20px rgba(0, 242, 254, 0.15);
  background: var(--bg-card-hover);
}

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

.feature-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.feature-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--pcb-copper-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.feature-card:hover .feature-icon-wrapper {
  background: rgba(0, 242, 254, 0.15);
  border-color: var(--pcb-cyan-track);
  color: var(--pcb-cyan-track);
  box-shadow: 0 0 16px var(--pcb-cyan-glow);
  transform: scale(1.06);
}

.feature-icon-wrapper svg {
  width: 28px;
  height: 28px;
}

.feature-chip-code {
  font-family: ui-monospace, monospace;
  font-size: 0.725rem;
  color: var(--text-muted);
  border: 1px dashed var(--border-color);
  padding: 3px 8px;
  border-radius: 4px;
}

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

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 22px;
}

.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.feature-tag-item {
  font-family: ui-monospace, monospace;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  background: var(--bg-tag);
  border: 1px solid rgba(245, 158, 11, 0.2);
  color: var(--pcb-copper-gold);
  border-radius: 4px;
}

/* 7. 流媒体与AI专题板块 (双集成芯片图卡) */
.media-ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.special-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 40px;
  position: relative;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.special-card:hover {
  transform: translateY(-5px);
  border-color: var(--pcb-cyan-track);
  box-shadow: var(--shadow-lg), 0 0 25px rgba(0, 242, 254, 0.18);
}

.special-badge {
  align-self: flex-start;
  font-family: ui-monospace, monospace;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 4px;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.badge-stream {
  background: rgba(239, 68, 68, 0.12);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.4);
}

.badge-ai {
  background: rgba(0, 242, 254, 0.12);
  color: var(--pcb-cyan-track);
  border: 1px solid rgba(0, 242, 254, 0.4);
}

.special-title {
  font-size: 1.65rem;
  font-weight: 800;
  margin-bottom: 14px;
}

.special-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 24px;
}

.media-badges, .ai-badges {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}

.badge-box {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: var(--transition);
}

.badge-box:hover {
  border-color: var(--pcb-copper-gold);
  transform: translateY(-2px);
}

.badge-box svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.special-features-list {
  border-top: 1px dashed var(--border-color);
  padding-top: 20px;
}

.special-feature-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.special-feature-row:last-child {
  margin-bottom: 0;
}

.special-feature-row svg {
  color: var(--pcb-cyan-track);
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* 8. 套餐价格对比表 (参考网上优质专线真实套餐数据) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 40px 32px;
  position: relative;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

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

/* 进阶推荐高亮套餐 (沉金镀层包边) */
.pricing-card.featured {
  border-color: var(--pcb-copper-gold);
  background: var(--bg-card-hover);
  box-shadow: 0 0 30px rgba(245, 158, 11, 0.25);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.05) translateY(-4px);
  box-shadow: 0 0 40px rgba(245, 158, 11, 0.4);
}

.pricing-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gold-gradient);
  color: #0b0c0e;
  font-family: ui-monospace, monospace;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 18px;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
  letter-spacing: 0.5px;
  white-space: nowrap;
  width: max-content;
}

.pricing-header {
  margin-bottom: 24px;
  text-align: center;
}

.pricing-plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.pricing-plan-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin: 20px 0 24px 0;
}

.price-currency {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--pcb-copper-gold);
}

.price-amount {
  font-size: 3rem;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1;
  font-family: ui-monospace, SFMono-Regular, monospace;
}

.price-period {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.pricing-features-list {
  margin-bottom: 32px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.pricing-feature-item svg {
  width: 18px;
  height: 18px;
  color: var(--pcb-cyan-track);
  flex-shrink: 0;
  margin-top: 2px;
}

.pricing-cta {
  width: 100%;
}

/* 9. 用户评价 (Testimonials) */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-card:hover {
  transform: translateY(-4px);
  border-color: var(--pcb-cyan-track);
  box-shadow: 0 8px 24px rgba(0, 242, 254, 0.12);
}

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

.star-rating svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.testimonial-content {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 24px;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.author-avatar {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-sm);
  background: var(--gold-gradient);
  color: #0b0c0e;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
}

.author-name {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
}

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

/* 10. 常见问题解答 (FAQ) */
.faq-wrap {
  max-width: 840px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--pcb-copper-gold);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 24px;
  background: transparent;
  border: none;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
}

.faq-icon {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease;
  color: var(--pcb-cyan-track);
  flex-shrink: 0;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  padding: 0 24px;
}

.faq-item.active .faq-answer {
  max-height: 600px;
  transition: max-height 0.4s ease-in-out;
  padding-bottom: 22px;
}

.faq-answer p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 11. 底部高能号召 Banner (PCB 母板光刻条) */
.cta-banner-section {
  padding: 80px 0;
}

.cta-banner {
  background: linear-gradient(135deg, rgba(17, 19, 23, 0.95) 0%, rgba(11, 12, 14, 0.98) 100%);
  border: 1px solid var(--pcb-copper-gold);
  border-radius: var(--radius-md);
  padding: 64px 40px;
  text-align: center;
  color: #ffffff;
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 35px rgba(245, 158, 11, 0.2);
}

.cta-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(0, 242, 254, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 242, 254, 0.06) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.cta-banner h2 {
  font-size: 2.35rem;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.25;
  position: relative;
}

.cta-banner p {
  font-size: 1.125rem;
  opacity: 0.9;
  max-width: 640px;
  margin: 0 auto 36px auto;
  position: relative;
}

/* 12. 页脚规范 (Footer) */
/* 严格遵循要求：页脚只保留这四个标题，内容打开新的页面展示 */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 48px 0 36px 0;
  transition: var(--transition);
  position: relative;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
}

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

.footer-link {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
}

.footer-link:hover {
  color: var(--pcb-copper-gold);
}

.footer-divider {
  width: 100%;
  max-width: 480px;
  height: 1px;
  background: var(--border-color);
}

.footer-copyright {
  font-family: ui-monospace, monospace;
  font-size: 0.8125rem;
  color: var(--text-muted);
  text-align: center;
}

/* 13. 单独子页面与推荐资讯专用排版 */
.page-header {
  padding: 64px 0 40px 0;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-card);
}

.page-content-wrap {
  max-width: 880px;
  margin: 48px auto 96px auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 48px;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.news-card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 32px;
}

.news-article-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 28px;
  transition: var(--transition);
}

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

.news-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: ui-monospace, monospace;
  font-size: 0.8125rem;
  color: var(--pcb-cyan-track);
  margin-bottom: 12px;
}

.news-tag {
  background: rgba(245, 158, 11, 0.15);
  color: var(--pcb-copper-gold);
  padding: 2px 8px;
  border-radius: 3px;
  font-weight: 700;
}

.news-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.news-excerpt {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.legal-article h2 {
  font-size: 1.45rem;
  font-weight: 700;
  margin: 36px 0 14px 0;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.legal-article h2:first-of-type {
  margin-top: 0;
}

.legal-article p, .legal-article ul {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 18px;
}

.legal-article ul {
  padding-left: 20px;
  list-style: disc;
}

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

.highlight-box {
  background: var(--bg-tag);
  border-left: 4px solid var(--pcb-copper-gold);
  padding: 18px 22px;
  border-radius: var(--radius-sm);
  margin: 24px 0;
  font-size: 0.95rem;
  color: var(--text-primary);
}

/* 13.1 深度 SEO 长文专用排版与目录系统 */
.article-header {
  padding: 64px 0 36px 0;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-card);
}

.article-header-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.3;
  max-width: 900px;
  margin: 16px auto;
  letter-spacing: -0.02em;
}

.article-meta-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  font-family: ui-monospace, monospace;
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 14px;
}

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

.article-toc-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--pcb-copper-gold);
  border-radius: var(--radius-sm);
  padding: 24px 28px;
  margin: 32px 0 44px 0;
}

.article-toc-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.article-toc-list li {
  margin-bottom: 8px;
  font-size: 0.95rem;
}

.article-toc-list a {
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

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

.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-secondary);
}

.article-body h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 48px 0 20px 0;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 30px 0 14px 0;
}

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

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

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

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

.article-table-wrap {
  overflow-x: auto;
  margin: 28px 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.925rem;
}

.article-table th {
  background: var(--bg-secondary);
  color: var(--pcb-copper-gold);
  font-weight: 700;
  padding: 14px 18px;
  border-bottom: 2px solid var(--border-color);
  white-space: nowrap;
}

.article-table td {
  padding: 12px 18px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.article-table tr:hover td {
  background: var(--bg-tag);
}

.article-code-block {
  background: #090b10;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 18px 22px;
  margin: 24px 0;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.875rem;
  color: #38bdf8;
  line-height: 1.6;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.08) 0%, rgba(0, 242, 254, 0.06) 100%);
  border: 1px solid var(--pcb-copper-gold);
  border-radius: var(--radius-md);
  padding: 36px 32px;
  margin: 48px 0;
  text-align: center;
}

.article-cta-box h3 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.article-cta-box p {
  font-size: 0.98rem;
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto 24px auto;
}

.related-articles-section {
  margin-top: 56px;
  padding-top: 36px;
  border-top: 2px dashed var(--border-color);
}

.related-articles-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 22px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

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

.related-card:hover {
  border-color: var(--pcb-copper-gold);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.related-card h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.45;
  margin-bottom: 10px;
}

.related-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 14px;
}

.related-card .read-more {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--pcb-cyan-track);
}

@media (max-width: 768px) {
  .related-grid {
    grid-template-columns: 1fr;
  }
  .article-header-title {
    font-size: 1.65rem;
  }
}

/* 14. 响应式媒体查询 (Mobile & Tablet) */
@media (max-width: 1024px) {
  .advantages-grid,
  .pricing-grid,
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-card.featured {
    transform: none;
  }
  
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
  
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 60px 0;
  }
  
  .hero {
    padding: 60px 0 48px 0;
  }
  
  .hero-title {
    font-size: 2.25rem;
    line-height: 1.22;
  }
  
  .hero-subtitle {
    font-size: 1.05rem;
    margin-bottom: 32px;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }
  
  .hero-cta-group .btn {
    width: 100%;
    min-height: 48px;
  }
  
  .hero-stats {
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 20px;
  }
  
  .nav-menu {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 24px;
    gap: 18px;
    box-shadow: var(--shadow-lg);
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .advantages-grid,
  .media-ai-grid,
  .pricing-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .media-badges, .ai-badges {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .section-title {
    font-size: 1.85rem;
  }
  
  .cta-banner {
    padding: 44px 20px;
  }
  
  .cta-banner h2 {
    font-size: 1.75rem;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 18px;
  }
  
  .page-content-wrap {
    padding: 24px;
    margin: 24px auto 60px auto;
  }
}