/* 工业风构图 + 科技蓝与亮白基调 + 悬浮重叠图层分布 + 抽象网络拓扑为核心 + 16项规范布局 */
:root {
  --industrial-blue: #0A66FF;
  --industrial-blue-dark: #0052cc;
  --industrial-cyan: #00D4FF;
  --industrial-dark: #0B1220;
  --industrial-navy: #0f172a;
  --industrial-gray-bg: #F7F9FC;
  --industrial-metal-gray: #334155;
  --industrial-border: #E5E7EB;
  --text-main: #111827;
  --text-muted: #7C8CA3;
  --text-white: #ffffff;
  --text-light-desc: #A9B7CC;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: #ffffff;
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", Inter, system-ui, sans-serif;
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: all 0.25s ease;
}

ul {
  list-style: none;
}

/* 1. 公告条 (通栏，高约 46px，蓝到青横向渐变，白字 14px，左短标签，中间一行提示，右侧可关闭) */
.announcement-bar {
  width: 100%;
  height: 46px;
  background: linear-gradient(90deg, #0A66FF 0%, #00A6FF 50%, #00D4FF 100%);
  color: #ffffff;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 4%;
  font-weight: 500;
  position: relative;
  z-index: 1001;
}

.announcement-badge {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 2px 10px;
  border-radius: 4px;
  font-weight: 700;
  font-size: 11px;
  margin-right: 12px;
  letter-spacing: 0.5px;
}

.announcement-close {
  background: none;
  border: none;
  color: #ffffff;
  cursor: pointer;
  font-size: 16px;
  padding: 4px;
  line-height: 1;
  opacity: 0.85;
}
.announcement-close:hover {
  opacity: 1;
}

/* 2. 吸顶顶栏 (海军蓝底，透明度约 0.92，高约 69px，z-index 高于内容。左34px圆角标+字重800字标，中6个文字导航15px内边距9px 13px圆角10px，右实心主按钮) */
header {
  position: sticky;
  top: 0;
  width: 100%;
  height: 69px;
  background: rgba(11, 18, 32, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5%;
}

.logo-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-badge {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: linear-gradient(135deg, #0A66FF, #00D4FF);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 12px rgba(10, 102, 255, 0.4);
}

.logo-badge img {
  width: 22px;
  height: 22px;
}

.logo-text {
  font-size: 20px;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.5px;
}

.logo-text span {
  font-size: 11px;
  font-weight: 700;
  color: #00D4FF;
  background: rgba(0, 212, 255, 0.12);
  padding: 2px 7px;
  border-radius: 4px;
  margin-left: 6px;
  border: 1px solid rgba(0, 212, 255, 0.3);
}

nav {
  display: flex;
  align-items: center;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-item {
  position: relative;
}

.nav-link {
  font-size: 15px;
  color: #cbd5e1;
  padding: 9px 13px;
  border-radius: 10px;
  font-weight: 500;
  transition: all 0.2s;
  display: inline-block;
}

.nav-link:hover {
  color: #ffffff;
  background: rgba(10, 102, 255, 0.16);
}

.dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  background: rgba(15, 23, 42, 0.98);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  padding: 8px 0;
  min-width: 150px;
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.5);
  display: none;
  backdrop-filter: blur(8px);
}

.nav-item:hover .dropdown {
  display: block;
}

.dropdown li a {
  display: block;
  padding: 8px 18px;
  font-size: 14px;
  color: #cbd5e1;
}

.dropdown li a:hover {
  background: rgba(10, 102, 255, 0.2);
  color: #00D4FF;
}

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

.lang-switch {
  font-size: 13px;
  color: #94a3b8;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.btn-primary {
  background: linear-gradient(135deg, #0A66FF 0%, #00D4FF 100%);
  color: #ffffff !important;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: 12px;
  box-shadow: 0 4px 18px rgba(10, 102, 255, 0.38);
  border: 1px solid rgba(255, 255, 255, 0.2);
  display: inline-block;
  cursor: pointer;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(10, 102, 255, 0.52);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.28);
  color: #ffffff !important;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: 12px;
  display: inline-block;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.5);
}

/* 3. 首屏 (深色径向渐变，两列网格，左文案592px，右视觉504px，间距56px。以抽象网络拓扑为核心，悬浮重叠图层分布) */
.hero-wrapper {
  background: radial-gradient(circle at 75% 25%, #152238 0%, #0B1220 70%);
  color: #ffffff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.hero {
  position: relative;
  max-width: 1280px;
  margin: 0 auto;
  padding: 76px 5% 96px;
  display: grid;
  grid-template-columns: 592px 504px;
  gap: 56px;
  align-items: center;
  justify-content: space-between;
}

.capsule-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 9999px;
  font-size: 13.5px;
  font-weight: 600;
  color: #00D4FF;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.35);
  margin-bottom: 24px;
}

.hero-title {
  font-size: 58px;
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -1px;
  background: linear-gradient(180deg, #ffffff 40%, #93c5fd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 22px;
  max-width: 592px;
}

.hero-desc {
  font-size: 18px;
  color: #A9B7CC;
  max-width: 560px;
  line-height: 1.65;
  margin-bottom: 34px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 46px;
}

.hero-btn {
  height: 59px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 32px;
  border-radius: 14px;
  font-size: 16px;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 38px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 26px;
}

.stat-item h4 {
  font-size: 30px;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.1;
  font-family: monospace, system-ui;
}

.stat-item h4 span {
  font-size: 18px;
  color: #00D4FF;
  font-weight: 600;
}

.stat-item p {
  font-size: 13px;
  color: #A9B7CC;
  margin-top: 4px;
}

/* 抽象网络拓扑视觉 + 悬浮重叠图层 (504px x 430px) */
.hero-topology-visual {
  width: 504px;
  height: 430px;
  position: relative;
}

.topology-card-back {
  position: absolute;
  top: 0;
  right: 0;
  width: 440px;
  height: 380px;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(10, 102, 255, 0.3);
  border-radius: 20px;
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.topology-grid-pattern {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(10, 102, 255, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10, 102, 255, 0.12) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.topology-header {
  padding: 14px 20px;
  background: rgba(11, 18, 32, 0.8);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 2;
}

.topology-tag {
  font-size: 11px;
  font-family: monospace;
  color: #00D4FF;
  background: rgba(0, 212, 255, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
}

.topology-body {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 2;
}

.topology-body img {
  width: 90%;
  max-height: 250px;
  object-fit: contain;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

/* 悬浮重叠前置数据浮层 (工业风重叠卡) */
.topology-card-front-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid #E5E7EB;
  border-radius: 14px;
  padding: 18px 22px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.28);
  color: #111827;
  z-index: 5;
  width: 270px;
}

.topology-card-front-overlay .overlay-title {
  font-size: 12px;
  font-weight: 700;
  color: #0A66FF;
  text-transform: uppercase;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.topology-card-front-overlay .overlay-val {
  font-size: 20px;
  font-weight: 800;
  color: #111827;
  font-family: monospace;
}

.topology-card-front-overlay .overlay-desc {
  font-size: 12px;
  color: #64748b;
  margin-top: 4px;
}

/* 4. 信任条 (白底，四等分，间距18px，大号品牌蓝数字加一行灰色说明) */
.trust-bar {
  background: #ffffff;
  padding: 44px 5%;
  color: #111827;
}

.trust-grid {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  text-align: center;
}

.trust-item {
  padding: 16px;
  border-right: 1px solid #f1f5f9;
}
.trust-item:last-child {
  border-right: none;
}

.trust-number {
  font-size: 42px;
  font-weight: 800;
  color: #0A66FF;
  line-height: 1.1;
  margin-bottom: 6px;
  font-family: Inter, monospace, sans-serif;
}

.trust-item p {
  color: #7C8CA3;
  font-size: 15px;
  font-weight: 500;
}

/* 5. 居中标题公式与区块标准规范 */
.section-full {
  width: 100%;
  padding: 64px 0;
}

.section-full.bg-white {
  background: #ffffff;
  color: #111827;
}

.section-full.bg-light-gray {
  background: #F7F9FC;
  color: #111827;
}

.section-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 5%;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.center-capsule {
  display: inline-block;
  font-size: 13px;
  padding: 4px 14px;
  border-radius: 9999px;
  background: rgba(10, 102, 255, 0.1);
  color: #0A66FF;
  font-weight: 700;
  margin-bottom: 12px;
}

.section-title {
  font-size: 40px;
  font-weight: 800;
  letter-spacing: -0.8px;
  color: #111827;
  margin-bottom: 12px;
  line-height: 1.25;
}

.section-desc {
  font-size: 16px;
  color: #7C8CA3;
  max-width: 720px;
  margin: 0 auto;
}

/* 6. 能力区 (3列网格，间距22px，共6张卡片。白底，1px边框#E5E7EB，圆角16px，内边距28px 26px，无投影) */
.grid-3-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.card-white {
  background: #ffffff;
  border: 1px solid #E5E7EB;
  border-radius: 16px;
  padding: 28px 26px;
  position: relative;
  transition: transform 0.25s, border-color 0.25s;
}

.card-white:hover {
  border-color: #93c5fd;
  transform: translateY(-3px);
}

.icon-box-48 {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: #eff6ff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 18px;
  color: #0A66FF;
}

.card-white h3 {
  font-size: 19px;
  font-weight: 700;
  color: #111827;
  margin-bottom: 8px;
}

.card-white p {
  font-size: 14.5px;
  color: #7C8CA3;
  line-height: 1.6;
}

/* 7. 场景区 (浅灰底 #F7F9FC，3列6张卡片) */
.scene-card {
  background: #ffffff;
  border: 1px solid #E5E7EB;
  border-radius: 16px;
  padding: 28px 26px;
  position: relative;
}

.scene-card h3 {
  font-size: 19px;
  font-weight: 700;
  color: #111827;
  margin-bottom: 8px;
}

.scene-card p {
  font-size: 14.5px;
  color: #7C8CA3;
  line-height: 1.6;
}

/* 8. 证明区 (白底。圆角20px深色面板，内放分布图或状态，下方3列状态条目) */
.proof-panel {
  background: #0B1220;
  border-radius: 20px;
  padding: 38px 32px;
  color: #ffffff;
  box-shadow: 0 16px 36px rgba(11, 18, 32, 0.15);
}

.proof-visual-wrap {
  text-align: center;
  margin-bottom: 34px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 28px;
}

.proof-visual-wrap img {
  max-width: 100%;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.status-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.status-row-item {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.status-row-item span.name {
  font-size: 15px;
  font-weight: 600;
  color: #e2e8f0;
}

.status-badge-ok {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: #4ade80;
  font-weight: 600;
}

.status-badge-ok::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #4ade80;
  box-shadow: 0 0 6px #4ade80;
}

/* 9. 价格区 (浅灰底，4列等宽，间距20px。卡片圆角18px，内边距30px 24px，推荐档高亮) */
.pricing-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.pricing-card-col {
  background: #ffffff;
  border: 1px solid #E5E7EB;
  border-radius: 18px;
  padding: 30px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s;
}

.pricing-card-col .plan-name {
  font-size: 20px;
  font-weight: 700;
  color: #111827;
  margin-bottom: 4px;
}

.pricing-card-col .plan-tagline {
  font-size: 13.5px;
  color: #7C8CA3;
  margin-bottom: 20px;
  height: 38px;
}

.pricing-card-col .plan-price {
  font-size: 38px;
  font-weight: 800;
  color: #111827;
  margin-bottom: 24px;
  line-height: 1;
}

.pricing-card-col .plan-price span {
  font-size: 14px;
  color: #7C8CA3;
  font-weight: 500;
}

.pricing-card-col .plan-features {
  flex: 1;
  margin-bottom: 28px;
}

.pricing-card-col .plan-features li {
  font-size: 14px;
  color: #475569;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.pricing-card-col .plan-features li::before {
  content: "✔";
  color: #0A66FF;
  font-size: 12px;
  font-weight: bold;
}

.btn-plan-outline {
  display: block;
  width: 100%;
  text-align: center;
  padding: 12px 0;
  border-radius: 12px;
  border: 1px solid #cbd5e1;
  color: #1e293b;
  font-weight: 600;
  font-size: 15px;
}
.btn-plan-outline:hover {
  background: #f1f5f9;
  border-color: #94a3b8;
}

.pricing-card-col.featured-plan {
  border: 2px solid #0A66FF;
  background: linear-gradient(180deg, #eff6ff 0%, #ffffff 40%);
  box-shadow: 0 12px 32px rgba(10, 102, 255, 0.16);
  transform: translateY(-4px);
}

.featured-ribbon-tag {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: #0A66FF;
  color: #ffffff;
  font-size: 12px;
  font-weight: 700;
  padding: 3px 14px;
  border-radius: 9999px;
  box-shadow: 0 4px 10px rgba(10, 102, 255, 0.35);
}

.btn-plan-solid {
  display: block;
  width: 100%;
  text-align: center;
  padding: 12px 0;
  border-radius: 12px;
  background: #0A66FF;
  color: #ffffff !important;
  font-weight: 600;
  font-size: 15px;
  box-shadow: 0 4px 14px rgba(10, 102, 255, 0.35);
}
.btn-plan-solid:hover {
  background: #0056e0;
}

/* 10. 下载区 (白底，3列6项。44px图标、平台名、一行系统要求、下载标记) */
.download-grid-6 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.download-item-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 22px 20px;
  border: 1px solid #E5E7EB;
  border-radius: 14px;
  background: #ffffff;
  transition: all 0.25s;
}

.download-item-card:hover {
  border-color: #0A66FF;
  box-shadow: 0 6px 18px rgba(10, 102, 255, 0.08);
}

.download-icon-44 {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: #eff6ff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: #0A66FF;
  flex-shrink: 0;
}

.download-item-info {
  flex: 1;
}

.download-platform-name {
  font-size: 16px;
  font-weight: 700;
  color: #111827;
}

.download-req-text {
  font-size: 12.5px;
  color: #7C8CA3;
  margin-top: 2px;
}

.download-action-mark {
  font-size: 14px;
  font-weight: 600;
  color: #0A66FF;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* 11. 步骤区 (浅灰底，横向三步，序号、标题、两行说明) */
.steps-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.step-card {
  background: #ffffff;
  border-radius: 16px;
  border: 1px solid #E5E7EB;
  padding: 32px 28px;
  position: relative;
}

.step-number {
  font-size: 28px;
  font-weight: 800;
  color: #0A66FF;
  margin-bottom: 14px;
  font-family: monospace, sans-serif;
}

.step-card h3 {
  font-size: 19px;
  font-weight: 700;
  color: #111827;
  margin-bottom: 8px;
}

.step-card p {
  font-size: 14.5px;
  color: #7C8CA3;
  line-height: 1.6;
}

/* 12. 评价区 (白底，3列引言。引文、头像字、姓名、身份与使用时长) */
.reviews-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  border: 1px solid #E5E7EB;
  border-radius: 16px;
  padding: 28px 24px;
  background: #ffffff;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-quote-text {
  font-size: 15px;
  color: #334155;
  line-height: 1.65;
  margin-bottom: 24px;
}

.review-author-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.avatar-letter {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: #e0f2fe;
  color: #0369a1;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.author-meta-name {
  font-size: 15px;
  font-weight: 700;
  color: #111827;
}

.author-meta-detail {
  font-size: 12.5px;
  color: #7C8CA3;
}

/* 13. 问答区 (浅灰底，单列手风琴，圆角14px) */
.faq-accordion-box {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-panel-item {
  background: #ffffff;
  border: 1px solid #E5E7EB;
  border-radius: 14px;
  overflow: hidden;
  transition: all 0.25s;
}

.faq-panel-item.active {
  border-color: #0A66FF;
  box-shadow: 0 6px 20px rgba(10, 102, 255, 0.1);
}

.faq-q-title {
  padding: 18px 22px;
  font-size: 16px;
  font-weight: 600;
  color: #111827;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-a-content {
  padding: 0 22px 18px;
  font-size: 14.5px;
  color: #7C8CA3;
  line-height: 1.6;
}

.faq-panel-item:not(.active) .faq-a-content {
  display: none;
}

/* 14. 更新区 (白底，3张文章卡) */
.news-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.news-card {
  border: 1px solid #E5E7EB;
  border-radius: 16px;
  padding: 26px 22px;
  background: #ffffff;
  display: flex;
  flex-direction: column;
}

.news-tag-date {
  font-size: 13px;
  color: #0A66FF;
  font-weight: 600;
  margin-bottom: 8px;
}

.news-title {
  font-size: 18px;
  font-weight: 700;
  color: #111827;
  margin-bottom: 10px;
  line-height: 1.35;
}

.news-summary {
  font-size: 14px;
  color: #7C8CA3;
  line-height: 1.6;
  margin-bottom: 20px;
  flex: 1;
}

.news-more-link {
  font-size: 14px;
  font-weight: 600;
  color: #0A66FF;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* 15. 页脚 (海军蓝底，上内边距约66px。顶部5列：品牌1.5份，其余等宽) */
footer {
  background: #0B1220;
  color: #A9B7CC;
  padding: 66px 5% 36px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-top-grid {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
  gap: 34px;
  margin-bottom: 54px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 18px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 14px;
  color: #A9B7CC;
}

.footer-col ul li a:hover {
  color: #ffffff;
}

.footer-bottom-row {
  max-width: 1280px;
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13.5px;
  color: #7C8CA3;
}

.footer-bottom-row a {
  color: #7C8CA3;
  margin-left: 18px;
}
.footer-bottom-row a:hover {
  color: #cbd5e1;
}

/* 16. 右下角固定 52px 圆角方块按钮 (客服 + 回顶) */
.fixed-floating-actions {
  position: fixed;
  bottom: 28px;
  right: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 999;
}

.float-btn {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.float-btn-primary {
  background: #0A66FF;
  color: #ffffff;
  box-shadow: 0 6px 18px rgba(10, 102, 255, 0.4);
  font-size: 20px;
}

.float-btn-secondary {
  background: #1e293b;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
  font-size: 18px;
}

.float-btn:hover {
  transform: translateY(-3px);
}

/* 响应式断点 */
@media (max-width: 1080px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-left, .hero-title, .hero-desc {
    max-width: 100%;
  }
  .hero-topology-visual {
    width: 100%;
    max-width: 504px;
    margin: 0 auto;
  }
  .pricing-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 980px) {
  nav .nav-links {
    display: none;
  }
  .header-actions .lang-switch {
    display: none;
  }
  .footer-top-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .trust-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-3-col, 
  .download-grid-6, 
  .steps-grid-3, 
  .reviews-grid-3, 
  .news-grid-3, 
  .pricing-grid-4, 
  .status-grid-3 {
    grid-template-columns: 1fr;
  }
  .hero-cta-group {
    flex-direction: column;
  }
  .hero-btn {
    width: 100%;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom-row {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

/* === perf-opt-2026 === */
header, .header {
  contain: layout;
}
.card-white, .scene-card, .pricing-card, .review-card, .blog-card,
.download-item, .faq-item, .download-card-custom, .trust-card {
  contain: layout style;
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
@media (max-width: 980px) {
  header, .header {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}