/* ==========================================================================
   快连 LetsVPN 官方网站样式表
   设计风格：工业风质感、玫瑰金与暗灰涂装、左图右文不对称框架、内置动态流体气泡图形
   ========================================================================== */

:root {
  /* 暗灰工业涂装体系 */
  --industrial-dark-deep: #12151B;
  --industrial-dark-surface: #1A1F29;
  --industrial-dark-elevated: #242B38;
  --industrial-slate-line: rgba(255, 255, 255, 0.09);
  --industrial-border-active: rgba(197, 137, 122, 0.45);

  /* 工业浅钛灰底层 */
  --industrial-titanium-bg: #F4F6F9;
  --industrial-pure-white: #FFFFFF;
  --industrial-card-white: #FFFFFF;

  /* 工业玫瑰金属涂装 (Rose Gold Metallic) */
  --rose-gold-main: #C5897A;
  --rose-gold-light: #E6BCB0;
  --rose-gold-dark: #9E5B4D;
  --rose-gold-glow: rgba(197, 137, 122, 0.28);
  --rose-gold-gradient: linear-gradient(135deg, #ECC5B8 0%, #C5897A 50%, #9E5B4D 100%);
  --rose-gold-soft: rgba(197, 137, 122, 0.12);

  /* 辅助科技蓝 (用于品牌词点缀) */
  --tech-blue: #0284C7;
  --tech-blue-gradient: linear-gradient(135deg, #0284C7 0%, #0066FF 100%);

  /* 文字颜色体系 */
  --text-dark-primary: #0F172A;
  --text-dark-secondary: #334155;
  --text-dark-muted: #64748B;
  --text-light-primary: #FFFFFF;
  --text-light-secondary: #CBD5E1;
  --text-light-muted: #94A3B8;

  /* 字体系统 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", Consolas, "SF Mono", monospace;

  /* 工业风阴影与金属微反光 */
  --shadow-industrial: 0 16px 36px rgba(18, 21, 27, 0.08), 0 2px 8px rgba(197, 137, 122, 0.06);
  --shadow-elevated: 0 24px 50px rgba(18, 21, 27, 0.14), 0 6px 20px rgba(197, 137, 122, 0.12);
  --shadow-dark-card: 0 20px 45px rgba(0, 0, 0, 0.35), inset 0 1px 1px rgba(255, 255, 255, 0.1);

  /* 工业风切角 */
  --cut-corner-sm: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  --cut-corner-md: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  --cut-corner-lg: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}

/* 全局重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--industrial-pure-white);
  color: var(--text-dark-primary);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
}

/* ==========================================================================
   动态流体气泡图形 (Dynamic Fluid Metallic Bubbles)
   ========================================================================== */
.fluid-bubbles-viewport {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -2;
  overflow: hidden;
  pointer-events: none;
}

.metallic-fluid-bubble {
  position: absolute;
  filter: blur(40px);
  opacity: 0.55;
  animation: bubbleDrift 18s ease-in-out infinite alternate;
}

.bubble-alpha {
  width: 520px;
  height: 520px;
  top: -120px;
  right: -80px;
  background: radial-gradient(circle, rgba(197, 137, 122, 0.25) 0%, rgba(236, 197, 184, 0.1) 45%, transparent 70%);
  border-radius: 58% 42% 48% 52% / 46% 56% 44% 54%;
}

.bubble-beta {
  width: 600px;
  height: 600px;
  bottom: 8%;
  left: -140px;
  background: radial-gradient(circle, rgba(30, 36, 46, 0.12) 0%, rgba(197, 137, 122, 0.08) 50%, transparent 75%);
  border-radius: 44% 56% 58% 42% / 52% 44% 56% 48%;
  animation-duration: 24s;
}

.bubble-gamma {
  width: 420px;
  height: 420px;
  top: 48%;
  right: 12%;
  background: radial-gradient(circle, rgba(2, 132, 199, 0.08) 0%, rgba(197, 137, 122, 0.12) 50%, transparent 70%);
  border-radius: 64% 36% 42% 58% / 54% 46% 54% 46%;
  animation-duration: 16s;
}

@keyframes bubbleDrift {
  0% {
    transform: translate(0, 0) scale(1) rotate(0deg);
    border-radius: 58% 42% 48% 52% / 46% 56% 44% 54%;
  }
  50% {
    transform: translate(35px, -25px) scale(1.06) rotate(60deg);
    border-radius: 48% 52% 58% 42% / 56% 44% 48% 52%;
  }
  100% {
    transform: translate(-30px, 40px) scale(0.96) rotate(120deg);
    border-radius: 58% 42% 48% 52% / 46% 56% 44% 54%;
  }
}

/* 工业坐标刻度线底纹 */
.industrial-grid-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: 60px 60px;
  background-image: 
    linear-gradient(to right, rgba(15, 23, 42, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15, 23, 42, 0.03) 1px, transparent 1px);
  pointer-events: none;
  z-index: -1;
}

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

/* 工业卡片基类 (Industrial Card) */
.industrial-card {
  background: var(--industrial-pure-white);
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 12px;
  box-shadow: var(--shadow-industrial);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}

.industrial-card:hover {
  border-color: var(--rose-gold-main);
  box-shadow: var(--shadow-elevated);
  transform: translateY(-4px);
}

/* 工业机械角标 */
.industrial-bracket-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  background: rgba(197, 137, 122, 0.1);
  border: 1px solid var(--rose-gold-main);
  color: var(--rose-gold-dark);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  clip-path: var(--cut-corner-sm);
  margin-bottom: 20px;
}

/* ==========================================================================
   1. 吸顶白导航 (Logo, 7文字链, 「立即下载」)
   ========================================================================== */
.sticky-white-nav {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  z-index: 1000;
  transition: all 0.25s ease;
}

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

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

.industrial-logo-plate {
  width: 40px;
  height: 40px;
  background: var(--rose-gold-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  clip-path: var(--cut-corner-sm);
  box-shadow: 0 4px 14px var(--rose-gold-glow);
}

.brand-words-stack {
  display: flex;
  flex-direction: column;
}

.brand-main-heading {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--text-dark-primary);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.brand-main-heading span {
  color: var(--rose-gold-dark);
}

.brand-sub-spec {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--text-dark-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav-links-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 22px;
}

.nav-links-menu a {
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-dark-secondary);
  padding: 8px 4px;
  position: relative;
  transition: color 0.2s ease;
}

.nav-links-menu a:hover,
.nav-links-menu a.active {
  color: var(--rose-gold-dark);
}

.nav-links-menu a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--rose-gold-gradient);
  transition: width 0.25s ease;
}

.nav-links-menu a:hover::after,
.nav-links-menu a.active::after {
  width: 100%;
}

.nav-cta-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  font-size: 0.92rem;
  font-weight: 800;
  color: #FFFFFF;
  background: var(--rose-gold-gradient);
  clip-path: var(--cut-corner-sm);
  text-decoration: none;
  box-shadow: 0 4px 14px var(--rose-gold-glow);
  transition: all 0.25s ease;
}

.nav-cta-download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px var(--rose-gold-glow);
}

/* ==========================================================================
   2. 首屏：左文案、右产品图 (左图右文不对称框架)
   ========================================================================== */
.hero-industrial-section {
  padding: 60px 0 80px;
  position: relative;
}

.hero-asymmetric-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 50px;
  align-items: center;
}

.hero-left-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.pulse-industrial-dot {
  width: 8px;
  height: 8px;
  background-color: var(--rose-gold-main);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(197, 137, 122, 0.7);
  animation: pulseRose 2s infinite;
}

@keyframes pulseRose {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(197, 137, 122, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(197, 137, 122, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(197, 137, 122, 0); }
}

.hero-h1-heading {
  font-size: 2.75rem;
  line-height: 1.25;
  font-weight: 900;
  color: var(--text-dark-primary);
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero-blue-brand-word {
  color: var(--tech-blue);
  background: var(--tech-blue-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-rosegold-phrase {
  color: var(--rose-gold-dark);
  background: var(--rose-gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-desc-paragraph {
  font-size: 1.08rem;
  color: var(--text-dark-secondary);
  line-height: 1.75;
  margin-bottom: 32px;
  max-width: 580px;
}

.hero-dual-cta-row {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.btn-solid-rosegold {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 15px 34px;
  background: var(--rose-gold-gradient);
  color: #FFFFFF;
  font-size: 1.05rem;
  font-weight: 800;
  clip-path: var(--cut-corner-sm);
  text-decoration: none;
  box-shadow: 0 6px 20px var(--rose-gold-glow);
  transition: all 0.28s ease;
}

.btn-solid-rosegold:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 28px var(--rose-gold-glow);
}

.btn-outline-rosegold {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 30px;
  background: rgba(255, 255, 255, 0.9);
  border: 1.5px solid var(--rose-gold-main);
  color: var(--rose-gold-dark);
  font-size: 1.02rem;
  font-weight: 800;
  clip-path: var(--cut-corner-sm);
  text-decoration: none;
  transition: all 0.28s ease;
}

.btn-outline-rosegold:hover {
  background: rgba(197, 137, 122, 0.08);
  transform: translateY(-3px);
}

.hero-platform-capsules {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.capsule-chip-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(15, 23, 42, 0.12);
  border-radius: 999px;
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text-dark-secondary);
  text-decoration: none;
  transition: all 0.2s ease;
}

.capsule-chip-btn:hover {
  border-color: var(--rose-gold-main);
  color: var(--rose-gold-dark);
  transform: translateY(-2px);
}

/* 首屏右侧重工暗灰视窗展示 */
.hero-right-visual {
  position: relative;
}

.industrial-chassis-frame {
  background: var(--industrial-dark-surface);
  border: 1px solid rgba(197, 137, 122, 0.3);
  clip-path: var(--cut-corner-md);
  padding: 14px;
  box-shadow: 0 25px 60px rgba(18, 21, 27, 0.25);
  position: relative;
}

.chassis-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px 12px;
  border-bottom: 1px solid var(--industrial-slate-line);
}

.chassis-screw-dots {
  display: flex;
  gap: 6px;
}

.chassis-screw-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #334155;
  border: 1px solid #475569;
}

.chassis-status-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--rose-gold-light);
  letter-spacing: 0.05em;
}

.chassis-img-wrap {
  border-radius: 8px;
  overflow: hidden;
  background: #0B0E14;
}

.chassis-img-wrap img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.industrial-chassis-frame:hover .chassis-img-wrap img {
  transform: scale(1.02);
}

.chassis-telemetry-hud {
  position: absolute;
  bottom: -20px;
  right: -16px;
  background: var(--industrial-dark-elevated);
  border: 1px solid var(--rose-gold-main);
  clip-path: var(--cut-corner-sm);
  padding: 14px 20px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  gap: 14px;
  color: #FFFFFF;
}

.telemetry-icon-cell {
  width: 42px;
  height: 42px;
  background: rgba(197, 137, 122, 0.15);
  color: var(--rose-gold-light);
  display: flex;
  align-items: center;
  justify-content: center;
  clip-path: var(--cut-corner-sm);
}

.telemetry-title {
  font-size: 0.95rem;
  font-weight: 800;
  line-height: 1.2;
}

.telemetry-spec {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-light-muted);
}

/* ==========================================================================
   3. 价格：三张卡横排，中间「电脑专业版」标「推荐」
   ========================================================================== */
.pricing-section-container {
  padding: 80px 0;
  position: relative;
}

.section-head-title-wrap {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 50px;
}

.section-h2-title {
  font-size: 2.3rem;
  font-weight: 900;
  color: var(--text-dark-primary);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-subtitle-p {
  font-size: 1.05rem;
  color: var(--text-dark-secondary);
  line-height: 1.6;
}

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

.pricing-plan-card {
  padding: 38px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  clip-path: var(--cut-corner-md);
  position: relative;
}

/* 中间电脑专业版高亮 */
.pricing-plan-card.featured-pro-chassis {
  background: var(--industrial-dark-surface);
  color: #FFFFFF;
  border: 1.5px solid var(--rose-gold-main);
  box-shadow: 0 20px 50px rgba(18, 21, 27, 0.25), 0 0 30px rgba(197, 137, 122, 0.15);
  transform: translateY(-8px);
}

.pricing-plan-card.featured-pro-chassis:hover {
  transform: translateY(-12px);
}

.pro-rosegold-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--rose-gold-gradient);
  color: #FFFFFF;
  font-size: 0.78rem;
  font-weight: 900;
  padding: 4px 20px;
  clip-path: var(--cut-corner-sm);
  letter-spacing: 0.06em;
  box-shadow: 0 4px 12px var(--rose-gold-glow);
}

.plan-name-h3 {
  font-size: 1.35rem;
  font-weight: 900;
  margin-bottom: 8px;
}

.featured-pro-chassis .plan-name-h3 {
  color: #FFFFFF;
}

.plan-desc-p {
  font-size: 0.88rem;
  color: var(--text-dark-muted);
  margin-bottom: 24px;
  min-height: 42px;
}

.featured-pro-chassis .plan-desc-p {
  color: var(--text-light-muted);
}

.plan-price-block {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 28px;
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  padding-bottom: 20px;
}

.featured-pro-chassis .plan-price-block {
  border-bottom-color: var(--industrial-slate-line);
}

.price-curr-sign {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--rose-gold-dark);
}

.price-digit-large {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
}

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

.featured-pro-chassis .price-cycle-text {
  color: var(--text-light-muted);
}

.plan-spec-perks {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
}

.plan-spec-perks li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.94rem;
  line-height: 1.45;
}

.plan-spec-perks li svg {
  color: var(--rose-gold-main);
  flex-shrink: 0;
  margin-top: 2px;
}

.btn-card-choose {
  display: block;
  text-align: center;
  padding: 13px 20px;
  font-size: 0.98rem;
  font-weight: 800;
  clip-path: var(--cut-corner-sm);
  text-decoration: none;
  transition: all 0.25s ease;
}

.btn-card-choose-outline {
  background: transparent;
  border: 1.5px solid rgba(15, 23, 42, 0.15);
  color: var(--text-dark-primary);
}

.btn-card-choose-outline:hover {
  border-color: var(--rose-gold-main);
  color: var(--rose-gold-dark);
  background: rgba(197, 137, 122, 0.06);
}

.btn-card-choose-solid {
  background: var(--rose-gold-gradient);
  color: #FFFFFF;
  box-shadow: 0 4px 16px var(--rose-gold-glow);
}

.btn-card-choose-solid:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--rose-gold-glow);
}

/* ==========================================================================
   4. 说明带：左图右文不对称框架 (结合 2.webp)
   ========================================================================== */
.explain-band-container {
  padding: 80px 0;
  position: relative;
  background: var(--industrial-titanium-bg);
}

.explain-asymmetric-row {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 50px;
}

.explain-chassis-left {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-elevated);
  border: 1px solid rgba(197, 137, 122, 0.25);
  clip-path: var(--cut-corner-md);
}

.explain-chassis-left img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.explain-text-right h3 {
  font-size: 2.1rem;
  font-weight: 900;
  color: var(--text-dark-primary);
  margin-bottom: 16px;
  line-height: 1.3;
}

.explain-text-right p {
  font-size: 1.02rem;
  color: var(--text-dark-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

/* 2x2 工业说明网格 */
.explain-2x2-specs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.spec-cell-card {
  padding: 28px 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  clip-path: var(--cut-corner-sm);
}

.spec-icon-cube {
  width: 48px;
  height: 48px;
  background: rgba(197, 137, 122, 0.12);
  clip-path: var(--cut-corner-sm);
  color: var(--rose-gold-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.spec-info-h4 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-dark-primary);
  margin-bottom: 8px;
}

.spec-info-p {
  font-size: 0.92rem;
  color: var(--text-dark-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   5. 下载中心：Win / Mac / Android / iOS 四列
   ========================================================================== */
.download-center-section {
  padding: 80px 0;
  position: relative;
}

.download-four-cols-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.download-chassis-card {
  padding: 32px 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  clip-path: var(--cut-corner-sm);
}

.platform-mech-icon {
  width: 64px;
  height: 64px;
  background: rgba(197, 137, 122, 0.08);
  border: 1px solid rgba(197, 137, 122, 0.2);
  clip-path: var(--cut-corner-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--rose-gold-dark);
  margin-bottom: 18px;
  transition: all 0.25s ease;
}

.download-chassis-card:hover .platform-mech-icon {
  background: var(--rose-gold-gradient);
  color: #FFFFFF;
  transform: scale(1.08);
}

.platform-h3-name {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--text-dark-primary);
  margin-bottom: 6px;
}

.platform-build-tag {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-dark-muted);
  background: rgba(15, 23, 42, 0.04);
  padding: 3px 10px;
  border-radius: 4px;
  margin-bottom: 14px;
  display: inline-block;
}

.platform-spec-info {
  font-size: 0.88rem;
  color: var(--text-dark-secondary);
  line-height: 1.55;
  margin-bottom: 24px;
  min-height: 42px;
}

.btn-download-trigger {
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  background: rgba(255, 255, 255, 0.95);
  border: 1.5px solid var(--rose-gold-main);
  color: var(--rose-gold-dark);
  font-size: 0.92rem;
  font-weight: 800;
  clip-path: var(--cut-corner-sm);
  text-decoration: none;
  transition: all 0.25s ease;
}

.download-chassis-card:hover .btn-download-trigger {
  background: var(--rose-gold-gradient);
  color: #FFFFFF;
  border-color: transparent;
  box-shadow: 0 6px 18px var(--rose-gold-glow);
}

/* ==========================================================================
   6. 证明与内容：评价三列、博客三列加分页、代理合作、问答全展开
   ========================================================================== */
.proof-content-wrap {
  padding: 80px 0;
  position: relative;
}

/* 评价三列 */
.reviews-three-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 70px;
}

.review-industrial-card {
  padding: 30px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  clip-path: var(--cut-corner-sm);
}

.review-stars-bar {
  color: #D97706;
  display: flex;
  gap: 4px;
  margin-bottom: 14px;
}

.review-text-quote {
  font-size: 0.96rem;
  color: var(--text-dark-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.review-profile-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid rgba(15, 23, 42, 0.08);
  padding-top: 16px;
}

.profile-avatar-cube {
  width: 42px;
  height: 42px;
  background: var(--rose-gold-gradient);
  clip-path: var(--cut-corner-sm);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
}

.profile-name-txt {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-dark-primary);
  line-height: 1.2;
}

.profile-role-txt {
  font-size: 0.78rem;
  color: var(--text-dark-muted);
}

/* 博客三列加分页 */
.blog-three-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 30px;
}

.blog-chassis-card {
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  clip-path: var(--cut-corner-sm);
}

.blog-stamp-date {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--rose-gold-dark);
  font-weight: 700;
  margin-bottom: 10px;
}

.blog-title-h4 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-dark-primary);
  line-height: 1.4;
  margin-bottom: 12px;
}

.blog-desc-p {
  font-size: 0.92rem;
  color: var(--text-dark-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
}

.blog-more-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 800;
  color: var(--rose-gold-dark);
  text-decoration: none;
  transition: gap 0.2s ease;
}

.blog-more-btn:hover {
  gap: 10px;
}

.blog-pagination-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 70px;
}

.page-num-chip {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #FFFFFF;
  border: 1px solid rgba(15, 23, 42, 0.12);
  color: var(--text-dark-secondary);
  font-weight: 800;
  font-size: 0.9rem;
  text-decoration: none;
  clip-path: var(--cut-corner-sm);
  transition: all 0.2s ease;
}

.page-num-chip.active,
.page-num-chip:hover {
  background: var(--rose-gold-gradient);
  color: #FFFFFF;
  border-color: transparent;
  box-shadow: 0 4px 12px var(--rose-gold-glow);
}

/* 代理合作横条 (含 id="agent") */
.agent-banner-box {
  padding: 40px;
  background: var(--industrial-dark-surface);
  color: #FFFFFF;
  border: 1px solid var(--rose-gold-main);
  clip-path: var(--cut-corner-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 70px;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.2);
}

.agent-text-side h3 {
  font-size: 1.6rem;
  font-weight: 900;
  margin-bottom: 8px;
}

.agent-text-side p {
  font-size: 0.98rem;
  color: var(--text-light-secondary);
  line-height: 1.6;
}

.btn-agent-apply {
  padding: 14px 32px;
  background: var(--rose-gold-gradient);
  color: #FFFFFF;
  font-size: 0.98rem;
  font-weight: 800;
  clip-path: var(--cut-corner-sm);
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 4px 16px var(--rose-gold-glow);
  transition: all 0.25s ease;
}

.btn-agent-apply:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--rose-gold-glow);
}

/* 问答全展开 (直观展示不折叠，含 id="install" 与 id="agent") */
.faq-expand-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.faq-industrial-item {
  padding: 30px;
  clip-path: var(--cut-corner-sm);
}

.faq-q-heading {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 1.18rem;
  font-weight: 900;
  color: var(--text-dark-primary);
  margin-bottom: 12px;
  line-height: 1.4;
}

.faq-q-badge {
  background: var(--rose-gold-gradient);
  color: #FFFFFF;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 2px 8px;
  clip-path: var(--cut-corner-sm);
  flex-shrink: 0;
  margin-top: 3px;
}

.faq-a-body {
  font-size: 0.96rem;
  color: var(--text-dark-secondary);
  line-height: 1.75;
  padding-left: 36px;
}

/* ==========================================================================
   7. 工业专网拓扑收口 (结合 3.webp 包含 id="nodes")
   ========================================================================== */
.nodes-topology-section {
  padding: 80px 0;
  position: relative;
  background: var(--industrial-titanium-bg);
}

.nodes-asymmetric-row {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.nodes-visual-left {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-elevated);
  border: 1px solid rgba(197, 137, 122, 0.25);
  clip-path: var(--cut-corner-md);
}

.nodes-visual-left img {
  width: 100%;
  height: auto;
  display: block;
}

/* ==========================================================================
   8. 深色页脚：品牌栏加三组链接
   ========================================================================== */
.dark-industrial-footer {
  background: var(--industrial-dark-deep);
  color: #F8FAFC;
  padding: 80px 0 36px;
  position: relative;
  border-top: 1px solid var(--industrial-slate-line);
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 60px;
}

.footer-brand-side p {
  font-size: 0.92rem;
  color: var(--text-light-muted);
  line-height: 1.7;
  margin-top: 18px;
  max-width: 320px;
}

.footer-links-col h5 {
  font-size: 1.05rem;
  font-weight: 800;
  color: #FFFFFF;
  margin-bottom: 22px;
  letter-spacing: 0.02em;
  position: relative;
  padding-bottom: 8px;
}

.footer-links-col h5::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--rose-gold-gradient);
}

.footer-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-nav-list a {
  color: var(--text-light-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all 0.2s ease;
}

.footer-nav-list a:hover {
  color: var(--rose-gold-light);
  transform: translateX(4px);
}

.footer-bottom-bar {
  border-top: 1px solid var(--industrial-slate-line);
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: #64748B;
  flex-wrap: wrap;
  gap: 16px;
}

/* ==========================================================================
   子页面通用标头 (Subpage Hero)
   ========================================================================== */
.subpage-hero-banner {
  padding: 50px 0 40px;
  text-align: center;
  position: relative;
}

.subpage-hero-banner h1 {
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--text-dark-primary);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  line-height: 1.25;
}

.subpage-hero-banner p {
  font-size: 1.1rem;
  color: var(--text-dark-secondary);
  max-width: 720px;
  margin: 0 auto;
  line-height: 1.7;
}

/* 响应式断点适配 */
@media (max-width: 1024px) {
  .hero-asymmetric-grid,
  .explain-asymmetric-row,
  .nodes-asymmetric-row {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .pricing-three-cards-grid,
  .download-four-cols-grid,
  .reviews-three-grid,
  .blog-three-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .nav-links-menu {
    display: none;
  }
  .hero-h1-heading {
    font-size: 2.1rem;
  }
  .pricing-three-cards-grid,
  .download-four-cols-grid,
  .reviews-three-grid,
  .blog-three-grid,
  .explain-2x2-specs {
    grid-template-columns: 1fr;
  }
  .agent-banner-box {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
  .chassis-telemetry-hud {
    position: static;
    margin-top: 16px;
  }
}