/* ===================================================================
   TAGInternet 官方工业铭牌设计系统 (Industrial Tactile Tag Design System)
   配色方案: Drafting Bone-White (#f4f5f7), Hazard Machinery Red (#dc2626), Stamped Industrial Ink
   设计语言: 重型序列号设备铭牌、金属穿孔孔眼、矢量条形码、钢印批号、3D陀螺仪触感悬浮微交互
   =================================================================== */

:root {
  /* 白天模式 - 工程绘图骨白质感 (Drafting Bone-White) */
  --bg-primary: #f4f5f7;
  --bg-secondary: #eaecf0;
  --bg-elevated: #ffffff;
  --bg-glass: rgba(244, 245, 247, 0.92);
  --bg-card: #ffffff;
  --bg-tag-dark: #1e293b;
  --bg-tag-gray: #e2e8f0;

  /* 工业安全危险机械红 (Hazard Machinery Red) */
  --hazard-red: #dc2626;
  --hazard-red-hover: #b91c1c;
  --hazard-red-light: rgba(220, 38, 38, 0.08);
  --hazard-red-border: rgba(220, 38, 38, 0.28);
  --hazard-red-gradient: linear-gradient(135deg, #dc2626 0%, #ef4444 60%, #b91c1c 100%);

  /* 工业油墨印章色彩 (Stamped Industrial Ink) */
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-stamp: #1e293b;
  --text-inverse: #ffffff;

  /* 铭牌金属与装配边框 */
  --border-plate: #cbd5e1;
  --border-light: #e2e8f0;
  --border-heavy: #94a3b8;
  --border-dashed: #94a3b8;

  /* 穿孔铆钉材质效果 */
  --rivet-hole-bg: #cbd5e1;
  --rivet-hole-shadow: inset 1px 1px 3px rgba(15, 23, 42, 0.4), inset -1px -1px 2px rgba(255, 255, 255, 0.8);
  --rivet-border: #94a3b8;

  /* 物理机械阴影 */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.08);
  --shadow-plate: 0 4px 12px rgba(15, 23, 42, 0.08), 0 1px 3px rgba(15, 23, 42, 0.05);
  --shadow-plate-hover: 0 16px 32px rgba(15, 23, 42, 0.14), 0 4px 8px rgba(220, 38, 38, 0.12);
  --shadow-hazard: 0 6px 20px rgba(220, 38, 38, 0.28);

  --radius-xs: 3px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-plate: 14px;
  --radius-full: 9999px;

  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --transition-tactile: 0.24s cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-smooth: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  /* 夜间模式 - 重工业枪铁黑度 (Gunmetal Slate) */
  --bg-primary: #0a0d14;
  --bg-secondary: #0f141f;
  --bg-elevated: #151c2c;
  --bg-glass: rgba(10, 13, 20, 0.92);
  --bg-card: #121824;
  --bg-tag-dark: #1a2334;
  --bg-tag-gray: #1e283c;

  --hazard-red: #ef4444;
  --hazard-red-hover: #f87171;
  --hazard-red-light: rgba(239, 68, 68, 0.14);
  --hazard-red-border: rgba(239, 68, 68, 0.38);
  --hazard-red-gradient: linear-gradient(135deg, #ef4444 0%, #dc2626 70%, #991b1b 100%);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-stamp: #e2e8f0;
  --text-inverse: #0a0d14;

  --border-plate: #222d42;
  --border-light: #1a2334;
  --border-heavy: #334460;
  --border-dashed: #334460;

  --rivet-hole-bg: #07090e;
  --rivet-hole-shadow: inset 1px 1px 3px rgba(0, 0, 0, 0.8), inset -1px -1px 2px rgba(255, 255, 255, 0.1);
  --rivet-border: #222d42;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5);
  --shadow-plate: 0 4px 16px rgba(0, 0, 0, 0.6);
  --shadow-plate-hover: 0 16px 36px rgba(0, 0, 0, 0.8), 0 0 20px rgba(239, 68, 68, 0.25);
  --shadow-hazard: 0 6px 24px rgba(239, 68, 68, 0.35);
}

/* 基础重置与平滑滚动 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  scroll-behavior: smooth;
  scroll-padding-top: 86px; /* 锚点跳转平滑 offset */
  -webkit-font-smoothing: antialiased;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

body {
  line-height: 1.6;
  font-size: 15.5px;
  overflow-x: hidden;
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

img, svg {
  vertical-align: middle;
}

/* 工业条纹警示装饰带 (Hazard Stripes) */
.hazard-stripe-bar {
  height: 4px;
  width: 100%;
  background: repeating-linear-gradient(
    -45deg,
    var(--hazard-red),
    var(--hazard-red) 12px,
    #0f172a 12px,
    #0f172a 24px
  );
  opacity: 0.85;
}

/* 容器布局 */
.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 顶部工业仪表导航栏 */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 2px solid var(--border-plate);
  transition: all var(--transition-smooth);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-img {
  height: 40px;
  width: auto;
  display: block;
  object-fit: contain;
  transition: transform var(--transition-tactile);
}

.logo:hover .logo-img {
  transform: scale(1.03);
}

/* 昼夜模式自适应 Logo 显隐控制 */
[data-theme="dark"] .logo-img-light {
  display: none !important;
}

[data-theme="dark"] .logo-img-dark {
  display: block !important;
}

:not([data-theme="dark"]) .logo-img-light {
  display: block !important;
}

:not([data-theme="dark"]) .logo-img-dark {
  display: none !important;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-link {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  position: relative;
  transition: all var(--transition-smooth);
}

.nav-link:hover {
  color: var(--hazard-red);
  background: var(--hazard-red-light);
}

/* 导航中‘推荐资讯’高亮标志 */
.nav-link-highlight {
  color: var(--hazard-red);
  border: 1px dashed var(--hazard-red);
  background: var(--hazard-red-light);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
}

.nav-link-highlight:hover {
  background: var(--hazard-red);
  color: #ffffff;
}

.nav-link-highlight .intel-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--hazard-red);
  animation: pulse-dot 1.8s infinite;
}

.nav-link-highlight:hover .intel-dot {
  background: #ffffff;
}

@keyframes pulse-dot {
  0% { transform: scale(0.9); opacity: 0.8; }
  50% { transform: scale(1.4); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.8; }
}

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

/* 精致专业化透明昼夜模式切换按钮 */
.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border: 1.5px solid var(--border-plate);
  cursor: pointer;
  transition: all var(--transition-tactile);
  position: relative;
  overflow: hidden;
}

.theme-toggle-btn:hover {
  color: var(--hazard-red);
  border-color: var(--hazard-red);
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(220, 38, 38, 0.15);
}

.theme-toggle-btn:active {
  transform: translateY(1px) scale(0.96);
}

.theme-icon-sun,
.theme-icon-moon {
  position: absolute;
  width: 19px;
  height: 19px;
  transition: transform var(--transition-smooth), opacity var(--transition-smooth);
}

[data-theme="light"] .theme-icon-sun,
:not([data-theme="dark"]) .theme-icon-sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.6);
}

[data-theme="light"] .theme-icon-moon,
:not([data-theme="dark"]) .theme-icon-moon {
  opacity: 1;
  transform: rotate(0) scale(1);
}

[data-theme="dark"] .theme-icon-sun {
  opacity: 1;
  transform: rotate(0) scale(1);
  color: #f59e0b;
}

[data-theme="dark"] .theme-icon-moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.6);
}

/* 物理机械按键系统 (Tactile Spring Latch Button) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: 0.3px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition-tactile);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
  position: relative;
}

/* 机械弹簧卡扣释放按压动效 */
.btn:active {
  transform: translateY(2px) scale(0.98);
}

.btn-hazard {
  background: var(--hazard-red-gradient);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.25);
  box-shadow: 0 4px 14px rgba(220, 38, 38, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.btn-hazard:hover {
  opacity: 0.94;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(220, 38, 38, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.btn-hazard:active {
  transform: translateY(2px) scale(0.98);
  box-shadow: 0 2px 6px rgba(220, 38, 38, 0.4);
}

.btn-plate {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 2px solid var(--border-plate);
  box-shadow: var(--shadow-sm);
}

.btn-plate:hover {
  background: var(--bg-secondary);
  border-color: var(--hazard-red);
  color: var(--hazard-red);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 13px 32px;
  font-size: 16.5px;
  border-radius: var(--radius-sm);
}

.btn-block {
  width: 100%;
}

/* ===================================================================
   物理铭牌构件 (Physical Label & Rivet Architecture)
   =================================================================== */

/* 重型铭牌通用卡片外壳 (含金属穿孔与微阴影) */
.industrial-plate {
  background: var(--bg-card);
  border: 2px solid var(--border-plate);
  border-radius: var(--radius-plate);
  position: relative;
  box-shadow: var(--shadow-plate);
  transition: transform var(--transition-tactile), box-shadow var(--transition-tactile), border-color var(--transition-smooth);
  perspective: 1000px; /* 3D 陀螺仪视差基座 */
  overflow: hidden;
}

/* 陀螺仪 3D 拟物物理感浮动交互 */
.industrial-plate:hover {
  transform: translateY(-6px) rotateX(1.5deg) rotateY(-1deg);
  box-shadow: var(--shadow-plate-hover);
  border-color: var(--hazard-red-border);
}

/* 铭牌顶部金属冲孔铆钉穿孔孔位 (Rivet Punch-Hole) */
.rivet-hole {
  position: absolute;
  top: 14px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--rivet-hole-bg);
  box-shadow: var(--rivet-hole-shadow);
  border: 1.5px solid var(--rivet-border);
  z-index: 5;
}

.rivet-hole.left { left: 16px; }
.rivet-hole.right { right: 16px; }

/* 工业条形码构件 (CSS 矢量条码) */
.barcode-box {
  display: flex;
  align-items: center;
  gap: 2px;
  height: 22px;
  opacity: 0.75;
}

.barcode-box span {
  display: inline-block;
  height: 100%;
  background: var(--text-stamp);
}

.barcode-box span.w-1 { width: 1.5px; }
.barcode-box span.w-2 { width: 3px; }
.barcode-box span.w-3 { width: 5px; }
.barcode-box span.sp-1 { width: 2px; background: transparent; }
.barcode-box span.sp-2 { width: 4px; background: transparent; }

/* 钢印批号与序列号 (Stamped Batch / Serial Badges) */
.stamp-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  padding: 3px 8px;
  border: 1px dashed var(--border-heavy);
  border-radius: var(--radius-xs);
  background: var(--bg-tag-gray);
  color: var(--text-stamp);
}

.stamp-tag-red {
  border-color: var(--hazard-red);
  color: var(--hazard-red);
  background: var(--hazard-red-light);
}

/* 红白编织织带挂角 (Woven Fabric Ribbon / Hazard Corner Badge) */
.plate-ribbon {
  position: absolute;
  top: 18px;
  right: -32px;
  transform: rotate(45deg);
  background: var(--hazard-red);
  color: #ffffff;
  font-size: 10.5px;
  font-weight: 800;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 4px 36px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
  z-index: 10;
}

/* ===================================================================
   主视觉区 (Hero Section) - 工业标语、产品简介与核心工况仪表
   =================================================================== */
.hero-section {
  padding: 80px 0 65px;
  position: relative;
  overflow: hidden;
}

.hero-backdrop-grid {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-size: 32px 32px;
  background-image: 
    linear-gradient(to right, rgba(148, 163, 184, 0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(148, 163, 184, 0.08) 1px, transparent 1px);
  z-index: -1;
  pointer-events: none;
}

.hero-plate {
  background: var(--bg-card);
  border: 2px solid var(--border-plate);
  border-radius: var(--radius-plate);
  padding: 48px 42px;
  box-shadow: var(--shadow-plate);
  position: relative;
  overflow: hidden;
}

.hero-plate-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 2px dashed var(--border-light);
  padding-bottom: 18px;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-brand-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 800;
  color: var(--hazard-red);
  letter-spacing: 1px;
}

/* 醒目大标题（必须包含当前品牌名） */
.hero-title {
  font-size: 46px;
  font-weight: 900;
  letter-spacing: -1px;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.hero-title-brand {
  color: var(--hazard-red);
  display: inline-block;
  border-bottom: 4px solid var(--hazard-red);
  padding-bottom: 2px;
}

.hero-subtitle {
  font-size: 21px;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 18px;
  line-height: 1.45;
}

/* 简介介绍区 (Brief Introduction) */
.hero-intro {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.75;
  max-width: 880px;
  margin-bottom: 34px;
}

.hero-cta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 38px;
}

/* 核心工况指标看板 (Telemetry Gauge Bar) */
.hero-gauges {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  background: var(--bg-secondary);
  border: 1.5px solid var(--border-plate);
  border-radius: var(--radius-sm);
  padding: 18px 24px;
}

.gauge-item {
  border-right: 1.5px dashed var(--border-plate);
  padding-right: 16px;
}

.gauge-item:last-child {
  border-right: none;
  padding-right: 0;
}

.gauge-value {
  font-family: var(--font-mono);
  font-size: 27px;
  font-weight: 900;
  color: var(--hazard-red);
  line-height: 1.1;
  margin-bottom: 4px;
}

.gauge-label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-secondary);
}

/* ===================================================================
   通用章节区块排版
   =================================================================== */
.section {
  padding: 85px 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-secondary);
  border-top: 2px solid var(--border-plate);
  border-bottom: 2px solid var(--border-plate);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 52px;
}

.section-tag-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--hazard-red);
  background: var(--hazard-red-light);
  border: 1px solid var(--hazard-red-border);
  padding: 4px 12px;
  border-radius: var(--radius-xs);
  margin-bottom: 14px;
}

.section-title {
  font-size: 34px;
  font-weight: 850;
  letter-spacing: -0.8px;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.section-desc {
  font-size: 16.5px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===================================================================
   产品核心优势介绍 (3个重型工业铭牌卡片)
   =================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-plate {
  padding: 38px 28px 28px;
}

.plate-meta-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.plate-icon-cube {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: var(--hazard-red-light);
  border: 1.5px solid var(--hazard-red-border);
  color: var(--hazard-red);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(220, 38, 38, 0.12);
  margin-bottom: 20px;
}

.plate-icon-cube svg {
  width: 28px;
  height: 28px;
}

.feature-title {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 24px;
}

.feature-specs-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 1.5px dashed var(--border-light);
  padding-top: 16px;
}

.spec-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
}

.spec-key {
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.spec-val {
  font-weight: 700;
  color: var(--text-primary);
}

/* ===================================================================
   流媒体图卡 & AI 支持图卡 (生态支持展示区)
   =================================================================== */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-plate {
  padding: 38px 32px 30px;
}

.showcase-header-wrap {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.showcase-badge-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--hazard-red);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.showcase-badge-icon svg {
  width: 26px;
  height: 26px;
}

.showcase-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
}

.showcase-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 26px;
}

.hardware-tags-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 26px;
}

.hardware-tag {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-plate);
  border-radius: var(--radius-xs);
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text-primary);
  transition: all var(--transition-smooth);
}

.hardware-tag:hover {
  border-color: var(--hazard-red);
  background: var(--hazard-red-light);
}

.hardware-tag-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 6px rgba(16, 185, 129, 0.6);
  flex-shrink: 0;
}

.showcase-plate-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1.5px dashed var(--border-light);
  padding-top: 16px;
  font-size: 13px;
  color: var(--text-muted);
}

/* ===================================================================
   TAG 真实套餐价格对比表 (Real TAG Plans Pricing)
   =================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  align-items: stretch;
}

.pricing-plate {
  padding: 34px 22px 26px;
  display: flex;
  flex-direction: column;
}

.pricing-plate.popular {
  border: 2px solid var(--hazard-red);
  box-shadow: 0 8px 30px rgba(220, 38, 38, 0.22);
  transform: scale(1.02);
  z-index: 2;
}

.pricing-plate.popular:hover {
  transform: translateY(-6px) scale(1.02);
}

.pricing-tier-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--hazard-red);
  margin-bottom: 6px;
  display: block;
}

.pricing-name {
  font-size: 21px;
  font-weight: 850;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.pricing-note {
  font-size: 13px;
  color: var(--text-muted);
  min-height: 38px;
  margin-bottom: 16px;
}

.pricing-cost-row {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1.5px dashed var(--border-light);
}

.pricing-currency {
  font-size: 20px;
  font-weight: 800;
  color: var(--hazard-red);
}

.pricing-amount {
  font-family: var(--font-mono);
  font-size: 38px;
  font-weight: 900;
  line-height: 1;
  color: var(--text-primary);
}

.pricing-cycle {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

.pricing-specs-list {
  margin-bottom: 26px;
  flex-grow: 1;
}

.pricing-specs-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 13.5px;
  color: var(--text-secondary);
  margin-bottom: 11px;
  line-height: 1.45;
}

.pricing-check {
  color: var(--hazard-red);
  font-weight: 900;
  font-size: 14px;
}

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

.testimonial-plate {
  padding: 30px 24px 22px;
  display: flex;
  flex-direction: column;
}

.stars-rating {
  color: #f59e0b;
  font-size: 14px;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.testimonial-text {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1.5px dashed var(--border-light);
  padding-top: 14px;
}

.user-avatar-stamp {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-xs);
  background: var(--bg-secondary);
  border: 1.5px solid var(--border-plate);
  color: var(--hazard-red);
  font-family: var(--font-mono);
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}

.user-meta-name {
  font-size: 14px;
  font-weight: 750;
  color: var(--text-primary);
}

.user-meta-role {
  font-size: 12px;
  color: var(--text-muted);
}

/* ===================================================================
   常见问题解答 (FAQ) - 原生 details 工业检定折叠卡
   =================================================================== */
.faq-container {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-plate {
  background: var(--bg-card);
  border: 1.5px solid var(--border-plate);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-smooth);
}

.faq-plate:hover {
  border-color: var(--hazard-red-border);
}

.faq-title-bar {
  padding: 18px 22px;
  font-size: 16px;
  font-weight: 750;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

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

.faq-arrow-icon {
  width: 18px;
  height: 18px;
  transition: transform var(--transition-smooth);
  color: var(--text-muted);
}

.faq-plate[open] .faq-arrow-icon {
  transform: rotate(180deg);
  color: var(--hazard-red);
}

.faq-body {
  padding: 0 22px 20px;
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px dashed var(--border-light);
  padding-top: 14px;
}

/* ===================================================================
   底部 CTA 呼吁看板 (Master Call to Action)
   =================================================================== */
.cta-banner-plate {
  margin: 60px 0 20px;
  background: var(--bg-card);
  border: 2px solid var(--hazard-red);
  border-radius: var(--radius-plate);
  padding: 50px 36px;
  text-align: center;
  box-shadow: var(--shadow-plate);
  position: relative;
  overflow: hidden;
}

.cta-banner-plate::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: repeating-linear-gradient(
    -45deg,
    var(--hazard-red),
    var(--hazard-red) 12px,
    #0f172a 12px,
    #0f172a 24px
  );
}

.cta-banner-title {
  font-size: 32px;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.cta-banner-desc {
  font-size: 16.5px;
  color: var(--text-secondary);
  max-width: 660px;
  margin: 0 auto 30px;
}

/* ===================================================================
   页脚 Footer - 严格只保留四个标题并新页面打开
   =================================================================== */
.footer {
  background: var(--bg-secondary);
  border-top: 2px solid var(--border-plate);
  padding: 44px 0 32px;
}

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

.footer-nav-link {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: var(--radius-xs);
  border: 1px solid transparent;
  transition: all var(--transition-smooth);
}

.footer-nav-link:hover {
  color: var(--hazard-red);
  border-color: var(--hazard-red-border);
  background: var(--hazard-red-light);
}

.footer-divider-line {
  max-width: 560px;
  height: 1px;
  background: var(--border-plate);
  margin: 18px auto;
}

.footer-copyright-text {
  text-align: center;
  font-size: 12.5px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ===================================================================
   独立子页面通用结构 (Sub-pages & Tech Intel)
   =================================================================== */
.page-header-box {
  padding: 60px 0 40px;
  text-align: center;
  background: var(--bg-secondary);
  border-bottom: 2px solid var(--border-plate);
}

.page-main-title {
  font-size: 36px;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.page-main-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

.prose-plate {
  max-width: 880px;
  margin: 40px auto 70px;
  padding: 42px 38px;
}

.prose h2 {
  font-size: 21px;
  font-weight: 800;
  margin: 32px 0 14px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.prose h2:first-child {
  margin-top: 0;
}

.prose p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.prose ul {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 20px;
}

.prose li {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 8px;
}

.prose .highlight-box {
  background: var(--hazard-red-light);
  border-left: 4px solid var(--hazard-red);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 20px 0;
  color: var(--text-primary);
  font-size: 14.5px;
}

/* ===================================================================
   长篇深度 SEO 文章专属样式 (Article, TOC, FAQ & Related Posts)
   =================================================================== */
.article-header-wrap {
  margin-bottom: 32px;
  border-bottom: 2px dashed var(--border-light);
  padding-bottom: 24px;
}

.article-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
  font-family: var(--font-mono);
  flex-wrap: wrap;
}

.article-breadcrumb a {
  color: var(--text-secondary);
  transition: color var(--transition-smooth);
}

.article-breadcrumb a:hover {
  color: var(--hazard-red);
}

.article-meta-tags {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-muted);
}

/* 工业级目录导读盒 (TOC Box) */
.article-toc-box {
  background: var(--bg-secondary);
  border: 1.5px solid var(--border-plate);
  border-radius: var(--radius-sm);
  padding: 22px 26px;
  margin: 28px 0 36px;
  box-shadow: var(--shadow-sm);
}

.toc-title {
  font-size: 16px;
  font-weight: 850;
  color: var(--hazard-red);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-family: var(--font-mono);
}

.toc-list {
  list-style: none !important;
  padding-left: 0 !important;
  margin-bottom: 0 !important;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px 18px;
}

.toc-list li {
  margin-bottom: 0 !important;
  font-size: 14px !important;
}

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

.toc-list a:hover {
  color: var(--hazard-red);
  text-decoration: underline;
}

/* 文章内部对比表格 */
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 14px;
  background: var(--bg-card);
  border: 1.5px solid var(--border-plate);
  border-radius: var(--radius-xs);
  overflow: hidden;
}

.prose th, .prose td {
  padding: 12px 14px;
  border: 1px solid var(--border-plate);
  text-align: left;
}

.prose th {
  background: var(--bg-secondary);
  font-weight: 750;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.prose td {
  color: var(--text-secondary);
}

/* 相关阅读网格 (Related Posts) */
.related-posts-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 2px dashed var(--border-light);
}

.related-section-title {
  font-size: 20px;
  font-weight: 850;
  color: var(--text-primary);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.related-card {
  padding: 20px 22px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-plate);
  border-radius: var(--radius-sm);
  transition: all var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

.related-card:hover {
  border-color: var(--hazard-red);
  transform: translateY(-3px);
  background: var(--bg-card);
}

.related-card-title {
  font-size: 15px;
  font-weight: 750;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.45;
}

.related-card:hover .related-card-title {
  color: var(--hazard-red);
}

.related-card-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.55;
  margin-top: auto;
}

@media (max-width: 768px) {
  .toc-list,
  .related-grid {
    grid-template-columns: 1fr;
  }
}

/* ===================================================================
   响应式媒体查询适配 (@media)
   =================================================================== */
@media (max-width: 1100px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-plate.popular {
    transform: none;
  }
}

@media (max-width: 900px) {
  .hero-title {
    font-size: 36px;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .showcase-grid {
    grid-template-columns: 1fr;
  }
  .hero-gauges {
    grid-template-columns: repeat(2, 1fr);
  }
  .gauge-item:nth-child(2) {
    border-right: none;
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-container {
    height: 66px;
  }
  .nav-menu {
    display: none; /* 移动端突出核心行动与模式切换 */
  }
  .hero-section {
    padding: 40px 0 30px;
  }
  .hero-plate {
    padding: 28px 18px;
  }
  .hero-title {
    font-size: 28px;
    letter-spacing: -0.5px;
  }
  .hero-subtitle {
    font-size: 17px;
  }
  .hero-intro {
    font-size: 14.5px;
    margin-bottom: 24px;
  }
  .hero-cta-bar {
    flex-direction: column;
    gap: 12px;
  }
  .hero-cta-bar .btn {
    width: 100%;
    min-height: 48px;
  }
  .hero-gauges {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    padding: 14px 16px;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .hardware-tags-grid {
    grid-template-columns: 1fr;
  }
  .cta-banner-plate {
    padding: 34px 18px;
  }
  .cta-banner-title {
    font-size: 24px;
  }
  .footer-nav {
    flex-direction: column;
    gap: 12px;
  }
  .prose-plate {
    padding: 24px 16px;
    margin: 20px auto 40px;
  }
}