/* ========== 全局变量 ========== */
:root {
  --bg-primary: #0A1428;      /* 深蓝灰主背景 */
  --bg-secondary: #141E33;    /* 石墨灰次级背景 */
  --bg-card: #1A2640;         /* 卡片背景 */
  --accent: #2E7FFF;          /* 科技蓝 */
  --accent-cyan: #00D4FF;     /* 青蓝点缀 */
  --text-primary: #FFFFFF;
  --text-secondary: #8B9BB4;
  --border: rgba(46, 127, 255, 0.15);
  --gradient: linear-gradient(135deg, #2E7FFF, #00D4FF);
  --transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
  font-family: 'Inter', 'Noto Sans', -apple-system, 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; transition: var(--transition); }
img { max-width: 100%; display: block; }

.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

/* ========== 顶部导航 ========== */
.header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  padding: 20px 0;
  background: rgba(10, 20, 40, 0.6);
  backdrop-filter: blur(12px);
  transition: var(--transition);
  border-bottom: 1px solid transparent;
}
.header.scrolled {
  padding: 12px 0;
  background: rgba(10, 20, 40, 0.95);
  border-bottom: 1px solid var(--border);
}
.header .container { display: flex; align-items: center; justify-content: space-between; }

/* ========== 图片 Logo ========== */
.logo {
  display: flex; align-items: center; gap: 10px;
  height: 44px; /* 固定高度，保证导航栏高度稳定 */
}
.logo img {
  height: 100%; width: auto; object-fit: contain;
  display: block;
  transition: var(--transition);
}
.logo:hover img { opacity: 0.85; }

/* 若图片 logo 旁仍需保留文字，用 .logo-text */
.logo-text {
  font-size: 20px; font-weight: 700; letter-spacing: 1px;
  background: var(--gradient); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}

/* 移动端适当缩小 logo */
@media (max-width: 768px) {
  .logo { height: 36px; }
}
.logob { font-size: 22px; font-weight: 700; letter-spacing: 1px; }
.logob span { background: var(--gradient); -webkit-background-clip: text; 
             -webkit-text-fill-color: transparent; background-clip: text; }

.nav { display: flex; gap: 40px; }
.nav a { font-size: 15px; color: var(--text-secondary); position: relative; }
.nav a:hover, .nav a.active { color: var(--text-primary); }
.nav a::after {
  content: ''; position: absolute; bottom: -6px; left: 0;
  width: 0; height: 2px; background: var(--gradient);
  transition: var(--transition);
}
.nav a:hover::after, .nav a.active::after { width: 100%; }

.nav-cta {
  padding: 10px 24px; border-radius: 6px;
  background: var(--gradient); font-size: 14px; font-weight: 600;
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(46, 127, 255, 0.4); }

/* 移动端菜单按钮 */
.menu-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
.menu-toggle span { width: 26px; height: 2px; background: var(--text-primary); transition: var(--transition); }

/* ========== 首屏 Banner ========== */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  position: relative; overflow: hidden;
  background: radial-gradient(circle at 70% 30%, rgba(46,127,255,0.15), transparent 60%),
              var(--bg-primary);
}
/* 动态网格背景 */
.hero::before {
  content: ''; position: absolute; inset: 0;
  background-image: linear-gradient(var(--border) 1px, transparent 1px),
                    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(circle at center, black, transparent 75%);
  animation: gridMove 20s linear infinite;
}
@keyframes gridMove { to { background-position: 60px 60px; } }

.hero-content { position: relative; z-index: 2; max-width: 720px; }
.hero-tag {
  display: inline-block; padding: 6px 16px; margin-bottom: 24px;
  border: 1px solid var(--border); border-radius: 40px;
  font-size: 13px; color: var(--accent-cyan); letter-spacing: 2px;
}
.hero h1 { font-size: clamp(32px, 5vw, 64px); font-weight: 700; line-height: 1.2; margin-bottom: 24px; }
.hero h1 em {
  font-style: normal;
  background: var(--gradient); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.hero p { font-size: 18px; color: var(--text-secondary); margin-bottom: 40px; max-width: 560px; }
.hero-btns { display: flex; gap: 20px; flex-wrap: wrap; }

.btn {
  padding: 16px 36px; border-radius: 8px; font-size: 15px;
  font-weight: 600; cursor: pointer; border: none; transition: var(--transition);
}
.btn-primary { background: var(--gradient); color: #fff; }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 32px rgba(46,127,255,0.45); }
.btn-outline {
  background: transparent; color: #fff; border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--accent); background: rgba(46,127,255,0.1); }

/* ========== 通用区块 ========== */
.section { padding: 100px 0; }
.section-head { text-align: center; margin-bottom: 64px; }
.section-head .subtitle {
  color: var(--accent-cyan); font-size: 14px; letter-spacing: 3px;
  text-transform: uppercase; margin-bottom: 12px;
}
.section-head h2 { font-size: clamp(26px, 3.5vw, 42px); font-weight: 700; margin-bottom: 16px; }
.section-head p { color: var(--text-secondary); max-width: 640px; margin: 0 auto; }

/* ========== 业务板块卡片 ========== */
.business-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.biz-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 16px; padding: 40px 32px;
  position: relative; overflow: hidden; transition: var(--transition);
}
.biz-card::before {
  content: ''; position: absolute; top: 0; left: 0;
  width: 100%; height: 3px; background: var(--gradient);
  transform: scaleX(0); transform-origin: left; transition: var(--transition);
}
.biz-card:hover { transform: translateY(-8px); border-color: var(--accent);
                  box-shadow: 0 20px 48px rgba(46,127,255,0.2); }
.biz-card:hover::before { transform: scaleX(1); }
.biz-icon {
  width: 56px; height: 56px; border-radius: 12px;
  background: rgba(46,127,255,0.12); display: flex; align-items: center;
  justify-content: center; font-size: 26px; margin-bottom: 24px;
}
.biz-card h3 { font-size: 20px; margin-bottom: 14px; }
.biz-card p { color: var(--text-secondary); font-size: 15px; }

/* ========== 数据统计 ========== */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-num { font-size: 48px; font-weight: 700;
            background: var(--gradient); -webkit-background-clip: text;
            -webkit-text-fill-color: transparent; background-clip: text; }
.stat-label { color: var(--text-secondary); font-size: 15px; margin-top: 8px; }

/* ========== 产品卡片 ========== */
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.product-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 16px; overflow: hidden; transition: var(--transition);
}
.product-card:hover { transform: translateY(-6px); border-color: var(--accent); }
.product-img { height: 220px; background: var(--bg-secondary);
               display: flex; align-items: center; justify-content: center;
               color: var(--text-secondary); font-size: 14px; overflow: hidden; }
.product-img img { width: 100%; height: 100%; object-fit: cover;
                   transition: transform 0.6s ease; }
.product-card:hover .product-img img { transform: scale(1.06); }
.product-body { padding: 24px; }
.product-body h3 { font-size: 18px; margin-bottom: 10px; }
.product-body p { color: var(--text-secondary); font-size: 14px; margin-bottom: 16px; }
.product-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.tag { padding: 4px 12px; border-radius: 20px; font-size: 12px;
       background: rgba(46,127,255,0.1); color: var(--accent-cyan); }

/* ========== 案例展示（带图片版） ========== */
.case-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }

.case-card {
  position: relative; border-radius: 16px; overflow: hidden;
  height: 360px; background: var(--bg-card); border: 1px solid var(--border);
  transition: var(--transition); cursor: pointer;
}
.case-card:hover { border-color: var(--accent);
  box-shadow: 0 24px 56px rgba(46,127,255,0.25); }

/* 案例背景图 —— 支持 <img> 或 background-image 两种写法，这里用 img 便于响应式 */
.case-bg {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; z-index: 0;
  transition: transform 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
  filter: brightness(0.55) saturate(1.05);
}
.case-card:hover .case-bg { transform: scale(1.08); filter: brightness(0.75) saturate(1.1); }

/* 深色渐变遮罩，保证文字可读 */
.case-overlay {
  position: absolute; inset: 0; padding: 36px; z-index: 2;
  display: flex; flex-direction: column; justify-content: flex-end;
  background: linear-gradient(to top,
    rgba(10,20,40,0.96) 0%,
    rgba(10,20,40,0.75) 40%,
    rgba(10,20,40,0.15) 75%,
    transparent 100%);
}

/* 左上角行业标签 */
.case-badge {
  position: absolute; top: 24px; left: 24px; z-index: 3;
  padding: 6px 16px; border-radius: 40px; font-size: 13px;
  color: #fff; background: rgba(46,127,255,0.85);
  backdrop-filter: blur(6px); letter-spacing: 1px;
}
.case-card h3 { font-size: 20px; margin-bottom: 10px; transition: var(--transition); }
.case-card:hover h3 { color: var(--accent-cyan); }
.case-card p { color: #C5D0E0; font-size: 14px; }

/* 悬停时底部伸出的"查看详情" */
.case-more {
  display: inline-flex; align-items: center; gap: 6px; margin-top: 16px;
  font-size: 14px; color: var(--accent-cyan);
  opacity: 0; transform: translateY(10px); transition: var(--transition);
}
.case-card:hover .case-more { opacity: 1; transform: translateY(0); }

/* 移动端：单列 + 降低高度 */
@media (max-width: 768px) {
  .case-card { height: 300px; }
  .case-overlay { padding: 28px; }
}

/* ========== 新闻列表 ========== */
.news-list { display: flex; flex-direction: column; gap: 0; }
.news-item {
  display: grid; grid-template-columns: 140px 1fr auto;
  gap: 32px; align-items: center; padding: 32px 0;
  border-bottom: 1px solid var(--border); transition: var(--transition);
}
.news-item:hover { padding-left: 16px; background: rgba(46,127,255,0.03); }
.news-date { color: var(--accent-cyan); font-size: 14px; }
.news-item h3 { font-size: 18px; margin-bottom: 8px; }
.news-item:hover h3 { color: var(--accent-cyan); }
.news-item p { color: var(--text-secondary); font-size: 14px; }
.news-arrow { color: var(--text-secondary); font-size: 20px; }

/* ========== 新闻详情 ========== */
.article { max-width: 800px; margin: 0 auto; }
.article h1 { font-size: 32px; margin-bottom: 16px; line-height: 1.4; }
.article-meta { color: var(--text-secondary); font-size: 14px;
                padding-bottom: 24px; margin-bottom: 32px;
                border-bottom: 1px solid var(--border); }
.article-body { font-size: 16px; line-height: 2; color: #C5D0E0; }
.article-body p { margin-bottom: 20px; }
.article-body h3 { color: #fff; font-size: 20px; margin: 32px 0 16px; }

/* ========== 页脚 ========== */
.footer { background: var(--bg-secondary); padding: 64px 0 32px;
          border-top: 1px solid var(--border); margin-top: 80px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 48px; }
.footer h4 { font-size: 16px; margin-bottom: 20px; }
.footer p, .footer li { color: var(--text-secondary); font-size: 14px; margin-bottom: 10px; }
.footer ul { list-style: none; }
.footer a:hover { color: var(--accent-cyan); }
.footer-bottom { text-align: center; padding-top: 32px; margin-top: 48px;
                 border-top: 1px solid var(--border); color: var(--text-secondary); font-size: 13px; }

/* ========== 滚动渐入动画 ========== */
.reveal { opacity: 0; transform: translateY(40px); transition: opacity 0.8s ease, transform 0.8s ease; }
.reveal.active { opacity: 1; transform: translateY(0); }

/* ========== 响应式适配 ========== */
@media (max-width: 992px) {
  .business-grid, .product-grid { grid-template-columns: repeat(2, 1fr); }
  .case-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 40px; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .menu-toggle { display: flex; }
  .nav {
    position: fixed; top: 0; right: -100%; width: 70%; height: 100vh;
    flex-direction: column; padding: 100px 40px; gap: 28px;
    background: var(--bg-secondary); transition: var(--transition);
  }
  .nav.open { right: 0; }
  .nav-cta { display: none; }
  .section { padding: 64px 0; }
  .business-grid, .product-grid, .stats, .footer-grid { grid-template-columns: 1fr; }
  .news-item { grid-template-columns: 1fr; gap: 12px; }
  .news-arrow { display: none; }
  .hero-btns { flex-direction: column; }
  .btn { width: 100%; text-align: center; }
}