/* ==========================================================================
   isubset.com 官方网站样式表
   郑州子集智能科技有限公司 (Zhengzhou Subset Intelligent Technology Co., Ltd.)
   严格遵循 VIS 规范与内容架构投产标准
   ========================================================================== */

@import url('./variables.css');

/* ---------- 基础重置与全局字体排版 ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 86px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--color-bg-base);
  color: var(--color-text-main);
  font-family: var(--font-sans);
  line-height: 1.75;
  overflow-x: hidden;
  position: relative;
  /* 淡淡的羊皮纸纤维微肌理叠加 */
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(200, 138, 50, 0.03) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(0, 48, 115, 0.03) 0%, transparent 45%);
}

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

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

button, input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* 容器基础宽度与内边距 */
.container {
  width: 100%;
  max-width: var(--max-width-site);
  margin-left: auto;
  margin-right: auto;
  padding-left: 28px;
  padding-right: 28px;
}

/* 段落规范：单行最佳汉字数与段落间距 */
p {
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

p:last-child {
  margin-bottom: 0;
}

/* 强调与标题色彩绑定 */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-primary);
  font-weight: 700;
  line-height: 1.35;
}

/* ==========================================================================
   VIS 品牌辅助图形系统 (严格符合 VIS 规范第 2.5 节)
   ========================================================================== */

/* 1. 气口斜切分割线: 砂岩灰细线 + 70%黄金分割点处45度斜切留白 + 中心天青圆点 */
.qi-kou-divider {
  position: relative;
  width: 100%;
  height: 24px;
  margin: 48px 0;
  display: flex;
  align-items: center;
}

.qi-kou-line-left {
  flex: 0 0 70%;
  height: 1px;
  background: linear-gradient(90deg, rgba(226, 221, 213, 0.2) 0%, var(--color-border) 100%);
  position: relative;
}

/* 45度斜切断口 */
.qi-kou-gap {
  width: 28px;
  height: 24px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.qi-kou-gap::before {
  content: '';
  position: absolute;
  width: 14px;
  height: 1px;
  background-color: var(--color-border);
  transform: rotate(-45deg);
  opacity: 0.8;
}

/* 断口中心的子集天青圆点 */
.qi-kou-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--color-accent-blue);
  box-shadow: 0 0 8px rgba(0, 159, 232, 0.5);
  z-index: 1;
}

.qi-kou-line-right {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--color-border) 0%, rgba(226, 221, 213, 0.2) 100%);
}

/* 2. 真子集阵列暗纹: 10点矩阵 (9浅灰 + 1点睛色，象征克制留白与精华提炼) */
.subset-dot-matrix {
  display: inline-grid;
  grid-template-columns: repeat(5, 6px);
  grid-gap: 6px;
  align-items: center;
  padding: 4px;
  opacity: 0.85;
}

.subset-dot-matrix span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-border);
}

.subset-dot-matrix span.active-gold {
  background-color: var(--color-accent-gold);
  box-shadow: 0 0 6px rgba(200, 138, 50, 0.4);
}

.subset-dot-matrix span.active-blue {
  background-color: var(--color-accent-blue);
  box-shadow: 0 0 6px rgba(0, 159, 232, 0.5);
}

/* 3. 极细双环水印 */
.ambient-rings-bg {
  position: absolute;
  pointer-events: none;
  opacity: 0.35;
  z-index: 0;
}

/* 引用块导语样式 (带琥珀鎏金左边线) */
.section-lead-quote {
  position: relative;
  padding: 20px 24px;
  background: rgba(242, 239, 233, 0.65);
  border-left: 3.5px solid var(--color-accent-gold);
  border-radius: 0 var(--radius-card) var(--radius-card) 0;
  font-size: 1.05rem;
  color: var(--color-text-main);
  line-height: 1.8;
  margin: 24px 0 40px;
  backdrop-filter: blur(4px);
}

.section-lead-quote strong {
  color: var(--color-primary);
}

/* ==========================================================================
   全局顶部导航栏 (Header)
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 78px;
  background-color: rgba(250, 248, 245, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border-subtle);
  z-index: 900;
  transition: all var(--transition-normal);
}

.site-header.scrolled {
  height: 70px;
  background-color: rgba(250, 248, 245, 0.96);
  box-shadow: var(--shadow-subtle);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* 品牌 Logo 区 */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  user-select: none;
}

.logo-symbol {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
}

.logo-symbol img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  mix-blend-mode: multiply;
}

.brand-logo:hover .logo-symbol {
  transform: scale(1.04);
}

.logo-text-group {
  display: flex;
  flex-direction: column;
}

/* 标准字 isubset：首字母 i 顶部的圆点为天青色，其余为藏蓝色 */
.brand-wordmark {
  font-family: var(--font-sans);
  font-size: 1.32rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-primary);
  line-height: 1.1;
  display: flex;
  align-items: center;
}

.brand-wordmark .wordmark-dot {
  color: var(--color-accent-blue);
  display: inline-block;
}

.brand-subname {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

/* 导航项 */
.main-nav {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-link {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--color-text-main);
  padding: 8px 4px;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--color-accent-blue);
  transition: all var(--transition-fast);
  transform: translateX(-50%);
  border-radius: var(--radius-pill);
}

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

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

/* 顶部高亮转化按钮 */
.header-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--color-primary) 0%, #08408f 100%);
  color: #FAF8F5;
  font-size: 0.92rem;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 4px 14px -2px rgba(0, 48, 115, 0.25);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.header-cta-btn:hover {
  background: linear-gradient(135deg, #093b82 0%, var(--color-accent-blue-dark) 100%);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px -2px rgba(0, 48, 115, 0.35);
  color: #FFFFFF;
}

.header-cta-btn .btn-pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--color-accent-blue);
  box-shadow: 0 0 8px #009FE8;
  animation: pulse-glow 2s infinite;
}

@keyframes pulse-glow {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.35); opacity: 0.6; }
}

/* 顶部右侧功能组合区 */
.header-right-group {
  display: flex;
  align-items: center;
  gap: 18px;
}

/* 极简语言切换器: 简 | EN | 繁 */
.lang-switch-box {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  user-select: none;
}

.lang-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 2px 2px;
  position: relative;
  transition: color var(--transition-fast);
  line-height: 1.2;
}

.lang-btn:hover {
  color: var(--color-primary);
}

.lang-btn.active {
  color: var(--color-primary);
  font-weight: 700;
}

.lang-btn.active::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

.lang-divider {
  color: var(--color-border);
  font-size: 0.75rem;
  user-select: none;
}

/* 移动端汉堡切换按钮 */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-primary);
}

.mobile-menu-btn svg {
  width: 26px;
  height: 26px;
}

/* ==========================================================================
   按钮组件与交互徽标
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.98rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  text-align: center;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #FAF8F5;
  box-shadow: 0 6px 20px -4px rgba(0, 48, 115, 0.28);
}

.btn-primary:hover {
  background-color: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px -4px rgba(0, 48, 115, 0.35);
  color: #FFFFFF;
}

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

.btn-secondary:hover {
  background-color: #e9e4da;
  border-color: #d1c9bd;
  transform: translateY(-2px);
  color: var(--color-primary-dark);
}

.btn-gold-outline {
  background-color: transparent;
  color: var(--color-accent-gold);
  border: 1.5px solid var(--color-accent-gold);
}

.btn-gold-outline:hover {
  background-color: var(--color-accent-gold);
  color: #FFFFFF;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-top: 16px;
  transition: gap var(--transition-fast), color var(--transition-fast);
}

.link-arrow:hover {
  color: var(--color-accent-blue);
  gap: 10px;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background-color: rgba(0, 48, 115, 0.06);
  color: var(--color-primary);
  border: 1px solid rgba(0, 48, 115, 0.12);
}

.badge-tag.gold {
  background-color: rgba(200, 138, 50, 0.08);
  color: var(--color-accent-gold);
  border-color: rgba(200, 138, 50, 0.25);
}

.badge-tag.blue {
  background-color: rgba(0, 159, 232, 0.08);
  color: var(--color-accent-blue);
  border-color: rgba(0, 159, 232, 0.25);
}

/* ==========================================================================
   一、首页 (轻量化品牌导览)
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 120px 0 90px;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
}


.hero-slogan {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 5.2vw, 3.8rem);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 16px;
  text-shadow: 0 2px 10px rgba(0, 48, 115, 0.06);
}

.hero-slogan-en {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.15rem;
  color: var(--color-accent-gold);
  letter-spacing: 0.05em;
  margin-bottom: 28px;
  display: block;
}

.hero-description {
  font-size: 1.18rem;
  line-height: 1.85;
  color: var(--color-text-main);
  max-width: 760px;
  margin: 0 auto 36px;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

/* 首页导览三大维度卡片网格 */
.home-overview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 24px;
  margin-top: 50px;
}

.overview-card {
  background-color: var(--color-bg-card-warm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 32px 28px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.overview-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent-blue) 100%);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.overview-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(0, 159, 232, 0.35);
}

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

.overview-header {
  margin-bottom: 16px;
}

.overview-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-accent-gold);
  letter-spacing: 0.08em;
  margin-bottom: 6px;
  display: block;
}

.overview-title {
  font-size: 1.35rem;
  margin-bottom: 8px;
}

.overview-core-value {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--color-accent-blue);
  margin-bottom: 14px;
}

.overview-desc {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.overview-products-pill-box {
  background-color: var(--color-bg-surface);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  margin-bottom: 18px;
}

.pill-box-label {
  font-size: 0.76rem;
  color: var(--color-text-muted);
  font-weight: 600;
  display: block;
  margin-bottom: 6px;
}

.pill-box-content {
  font-size: 0.88rem;
  color: var(--color-primary);
  font-weight: 600;
  line-height: 1.5;
}

/* ==========================================================================
   二、关于我们 (板块)
   ========================================================================== */
.section-anchor {
  padding-top: 40px;
}

.section-title-wrap {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 30px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-accent-gold);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.section-heading {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3.2vw, 2.5rem);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

/* 1. 公司简介与实绩数据看板 */
.company-profile-card {
  background-color: var(--color-bg-card-warm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 40px;
  box-shadow: var(--shadow-card);
  margin-bottom: 36px;
}

.company-profile-text {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--color-text-main);
  margin-bottom: 36px;
}

/* 四大实绩数据网格 (50+ / 100,000+ / 3000万+ / 200+) */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-gap: 20px;
}

.stat-item {
  background: var(--color-bg-base);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  text-align: left;
  position: relative;
  transition: all var(--transition-fast);
}

.stat-item:hover {
  border-color: var(--color-accent-blue);
  transform: translateY(-3px);
  box-shadow: var(--shadow-subtle);
}

.stat-num-row {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 8px;
}

.stat-number {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}

.stat-plus {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-accent-blue);
}

.stat-label {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.stat-desc {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* 2. 发展历程时间轴 (2022 -> 2025 -> 2026 -> 未来展望) */
.timeline-wrap {
  position: relative;
  margin: 50px auto;
  max-width: 980px;
}

.timeline-spine {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  background-color: var(--color-border);
  transform: translateX(-50%);
}

.timeline-event {
  position: relative;
  width: 50%;
  padding: 24px 40px;
  box-sizing: border-box;
}

.timeline-event:nth-child(odd) {
  left: 0;
  text-align: right;
  padding-right: 48px;
}

.timeline-event:nth-child(even) {
  left: 50%;
  text-align: left;
  padding-left: 48px;
}

/* 气口节点圆环 */
.timeline-node {
  position: absolute;
  top: 32px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--color-bg-base);
  border: 3px solid var(--color-primary);
  box-shadow: 0 0 0 4px rgba(250, 248, 245, 1);
  z-index: 2;
}

.timeline-event:nth-child(odd) .timeline-node {
  right: -8px;
}

.timeline-event:nth-child(even) .timeline-node {
  left: -8px;
}

.timeline-node.active-gold {
  border-color: var(--color-accent-gold);
  background-color: var(--color-accent-gold);
  box-shadow: 0 0 0 4px var(--color-bg-base), 0 0 10px rgba(200, 138, 50, 0.5);
}

.timeline-node.active-blue {
  border-color: var(--color-accent-blue);
  background-color: var(--color-accent-blue);
  box-shadow: 0 0 0 4px var(--color-bg-base), 0 0 10px rgba(0, 159, 232, 0.5);
}

.timeline-card {
  background-color: var(--color-bg-card-warm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px 26px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-fast);
  text-align: left;
}

.timeline-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent-blue);
}

.timeline-year-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  background-color: rgba(0, 48, 115, 0.08);
  color: var(--color-primary);
  margin-bottom: 10px;
}

.timeline-year-tag.gold {
  background-color: rgba(200, 138, 50, 0.12);
  color: var(--color-accent-gold);
}

.timeline-year-tag.blue {
  background-color: rgba(0, 159, 232, 0.12);
  color: var(--color-accent-blue);
}

.timeline-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.timeline-text {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
}

/* 3. 愿景、使命与价值观 (三排六宫格) */
.vision-mission-banner {
  background: linear-gradient(135deg, rgba(0, 48, 115, 0.04) 0%, rgba(200, 138, 50, 0.05) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 32px 36px;
  margin-bottom: 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-gap: 32px;
}

.vm-col h4 {
  font-size: 1.15rem;
  color: var(--color-primary);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.vm-col p {
  font-size: 0.95rem;
  color: var(--color-text-main);
  line-height: 1.8;
}

/* 核心价值观：三排六宫格 */
.values-row-label {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 28px 0 16px;
}

.values-row-label span.pill-tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background-color: var(--color-bg-surface);
  color: var(--color-accent-gold);
  border: 1px solid var(--color-border);
}

.values-row-label span.title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-gap: 20px;
  margin-bottom: 24px;
}

.value-card {
  background-color: var(--color-bg-card-warm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 28px 30px;
  box-shadow: var(--shadow-card);
  position: relative;
  transition: all var(--transition-fast);
}

.value-card:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 159, 232, 0.4);
  box-shadow: var(--shadow-card-hover);
}

.value-num {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent-gold);
  margin-bottom: 8px;
  display: block;
}

.value-title {
  font-size: 1.2rem;
  color: var(--color-primary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.value-desc {
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
}

/* ==========================================================================
   三、我们的创新 (产品矩阵与落地实证)
   ========================================================================== */
.innovation-sub-module {
  margin: 50px 0;
}

.module-header-box {
  margin-bottom: 28px;
}

.module-title {
  font-size: 1.6rem;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.module-desc {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  max-width: 900px;
}

/* 1. 面向用户：三大产品卡片 */
.user-products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 24px;
}

.product-card {
  background-color: var(--color-bg-card-warm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 30px 26px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-fast);
  position: relative;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-accent-blue);
}

.product-badge-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.product-title {
  font-size: 1.22rem;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.product-subtitle {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--color-accent-blue);
  margin-bottom: 14px;
}

.product-desc {
  font-size: 0.91rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 20px;
}

.product-stats-badge {
  background-color: var(--color-bg-surface);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  border-left: 3px solid var(--color-accent-blue);
}

.product-stats-badge .stats-text {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.6;
}

/* 2. 面向企业和组织：2×3 宫格矩阵 */
.enterprise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 22px;
  margin-bottom: 36px;
}

.enterprise-card {
  background-color: var(--color-bg-card-warm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 26px 24px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.enterprise-card:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 159, 232, 0.4);
  box-shadow: var(--shadow-card-hover);
}

.ent-header {
  margin-bottom: 12px;
}

.ent-code {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-accent-gold);
  margin-bottom: 4px;
  display: block;
}

.ent-name {
  font-size: 1.15rem;
  color: var(--color-primary);
}

.ent-body {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.ent-footer-metric {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-primary);
  background-color: var(--color-bg-surface);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  border-left: 2.5px solid var(--color-accent-gold);
}

/* 政企级安全与工程保障基石 (3 列横幅) */
.security-pillars-wrap {
  background: linear-gradient(135deg, rgba(0, 48, 115, 0.03) 0%, rgba(200, 138, 50, 0.04) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 30px;
}

.pillars-title {
  font-size: 1.15rem;
  color: var(--color-primary);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
}

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

.pillar-item {
  background-color: var(--color-bg-card-warm);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.pillar-name {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.pillar-name::before {
  content: '✓';
  color: var(--color-accent-blue);
  font-weight: 800;
}

.pillar-desc {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 3. 面向未来和创新：三级赋能与孵化生态 */
.future-ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 24px;
  margin-bottom: 30px;
}

.ecosystem-card {
  background-color: var(--color-bg-card-warm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 32px 26px;
  box-shadow: var(--shadow-card);
  position: relative;
  transition: all var(--transition-fast);
}

.ecosystem-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent-gold);
  box-shadow: var(--shadow-card-hover);
}

.eco-level-badge {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-accent-gold);
  background-color: rgba(200, 138, 50, 0.1);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  display: inline-block;
  margin-bottom: 14px;
}

.eco-name {
  font-size: 1.25rem;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.eco-desc {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
}

/* 数据口径说明微文字 */
.data-audit-notice {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  background-color: var(--color-bg-surface);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  margin-top: 24px;
}

/* ==========================================================================
   四、全局合作转化区 (Pre-Footer CTA)
   ========================================================================== */
.pre-footer-cta {
  padding: 70px 0 40px;
  position: relative;
}

.cta-cards-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-gap: 28px;
}

.cta-card {
  background: var(--color-bg-card-warm);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 44px 40px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.cta-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
}

.cta-card.enterprise-cta {
  border-color: rgba(0, 48, 115, 0.25);
  background: linear-gradient(145deg, #FAF8F5 0%, #F5F1E9 100%);
}

.cta-card.enterprise-cta:hover {
  border-color: var(--color-primary);
}

.cta-card.ecosystem-cta {
  border-color: rgba(200, 138, 50, 0.3);
  background: linear-gradient(145deg, #FAF8F5 0%, #F7F3EB 100%);
}

.cta-card.ecosystem-cta:hover {
  border-color: var(--color-accent-gold);
}

.cta-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-title {
  font-size: 1.45rem;
  color: var(--color-primary);
  margin-bottom: 14px;
}

.cta-desc {
  font-size: 1.02rem;
  color: var(--color-text-main);
  line-height: 1.75;
  margin-bottom: 28px;
}

.cta-btn-wrap {
  margin-top: auto;
}

/* ==========================================================================
   五、页脚 (Footer，全站底部通用)
   ========================================================================== */
.site-footer {
  background-color: var(--color-bg-surface);
  border-top: 1px solid var(--color-border);
  padding: 60px 0 30px;
  font-size: 0.9rem;
  position: relative;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.3fr;
  grid-gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-col {
  max-width: 340px;
}

.footer-brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.footer-brand-logo img {
  width: 36px;
  height: 36px;
  object-fit: contain;
  mix-blend-mode: multiply;
}

.footer-brand-intro {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.footer-nav-col h5 {
  font-size: 0.98rem;
  color: var(--color-primary);
  margin-bottom: 18px;
  font-weight: 700;
}

.footer-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-nav-links a {
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.footer-nav-links a:hover {
  color: var(--color-primary);
  transform: translateX(3px);
}

/* 二维码与官方阵地 */
.footer-channels-box {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.qr-trigger-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--color-bg-card-warm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 8px 14px;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
}

.qr-trigger-btn:hover {
  border-color: var(--color-accent-blue);
  background-color: #FFFFFF;
}

.qr-popup-card {
  position: absolute;
  bottom: calc(100% + 12px);
  left: 0;
  width: 200px;
  background-color: var(--color-bg-base);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 12px;
  box-shadow: var(--shadow-dropdown);
  display: none;
  z-index: 100;
  text-align: center;
}

.qr-trigger-btn:hover .qr-popup-card {
  display: block;
}

.qr-popup-card img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  margin-bottom: 6px;
}

.qr-popup-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.footer-address {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-top: 14px;
}

/* 底部版权与备案条 */
.footer-bottom-bar {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.footer-beian-links {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-beian-links a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.footer-beian-links a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

/* ==========================================================================
   响应式断点适配 (Responsive Design)
   ========================================================================== */
@media (max-width: 1024px) {
  .home-overview-grid,
  .user-products-grid,
  .future-ecosystem-grid,
  .enterprise-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pillars-grid {
    grid-template-columns: 1fr;
  }

  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .site-header {
    height: 70px;
  }

  .mobile-menu-btn {
    display: block;
  }

  .main-nav {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background-color: var(--color-bg-base);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    display: none;
    box-shadow: var(--shadow-dropdown);
  }

  .main-nav.mobile-active {
    display: flex;
  }

  .header-cta-btn,
  .header-right-group .header-cta-btn {
    display: none;
  }

  .header-right-group {
    gap: 8px;
  }

  .home-overview-grid,
  .user-products-grid,
  .future-ecosystem-grid,
  .enterprise-grid,
  .values-grid,
  .cta-cards-grid,
  .vision-mission-banner,
  .footer-top-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .timeline-spine {
    left: 20px;
  }

  .timeline-event {
    width: 100%;
    padding-left: 54px !important;
    padding-right: 12px !important;
    text-align: left !important;
  }

  .timeline-event:nth-child(even) {
    left: 0;
  }

  .timeline-event .timeline-node {
    left: 12px !important;
    right: auto !important;
  }

  .footer-bottom-bar {
    flex-direction: column;
    text-align: center;
  }
}