/* ========================================
   河南银国泰实业有限公司 - 全站样式
   设计策略：IT集成型 B2B官网
   ======================================== */

/* 重置与基础 */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Alibaba PuHuiTi', 'Noto Sans SC', 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  color: #111827;
  background-color: #F5F7FB;
}

:root {
  --primary: #1E40AF;           /* 科技蓝 */
  --primary-dark: #162E86;
  --secondary: #374151;         /* 专业灰 */
  --green: #059669;             /* 网络绿 */
  --orange: #D97706;            /* 数据橙 */
  --muted: #6B7280;
  --footer-text: #E8ECF5;
  --border: #E5E7EB;
  --card: #FFFFFF;
  --bg-light: #F8FAFC;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --radius: 12px;
}

img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; transition: all 0.2s ease; }
a:hover { color: var(--primary-dark); }

h1, h2, h3, h4, h5, h6 { color: var(--secondary); line-height: 1.3; font-weight: 700; }
p { color: #111827; margin-bottom: 1rem; }

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 20px;
}

section { padding: 80px 0; }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}
.btn-primary { background: linear-gradient(135deg, var(--primary), #3154d8); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { background: linear-gradient(135deg, #15308d, var(--primary)); transform: translateY(-1px); }
.btn-secondary { background: var(--green); color: #fff; }
.btn-secondary:hover { background: #047857; transform: translateY(-1px); }
.btn-outline { background: transparent; border-color: var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; box-shadow: var(--shadow); }
.btn-link { background: transparent; padding: 6px 0; color: var(--primary); font-weight: 700; }
.btn-link:hover { color: var(--primary-dark); text-decoration: underline; }
.btn-ghost { background: rgba(255,255,255,0.08); color: #fff; border: 1px solid rgba(255,255,255,0.18); }
.btn-sm { padding: 8px 14px; font-size: 0.95rem; }

/* 标记/标签 */
.tag { display: inline-block; padding: 6px 12px; border-radius: 999px; font-size: 0.9rem; background: #E0E7FF; color: var(--primary); font-weight: 600; }
.badge { display: inline-flex; align-items: center; justify-content: center; padding: 6px 10px; border-radius: 8px; background: #EEF2FF; color: var(--primary); font-weight: 600; }
.pill { display: inline-block; padding: 6px 10px; border-radius: 999px; background: var(--bg-light); color: var(--secondary); font-size: 0.9rem; border: 1px solid var(--border); margin: 4px; }

/* 导航 */
.site-header { position: sticky; top: 0; z-index: 999; backdrop-filter: blur(10px); }
.navbar { background: rgba(255,255,255,0.96); box-shadow: 0 12px 30px rgba(15, 23, 42, 0.06); }
.navbar .container { display: flex; align-items: center; justify-content: space-between; padding: 14px 20px; gap: 14px; }
.navbar nav { overflow-x: auto; }
.navbar nav::-webkit-scrollbar { display: none; }
.logo { font-size: 1.4rem; font-weight: 800; color: var(--primary); letter-spacing: 0.5px; }
.nav-menu { list-style: none; display: flex; align-items: center; gap: 14px; flex-wrap: nowrap; }
.nav-menu a { color: var(--secondary); font-weight: 600; padding: 8px 10px; border-radius: 10px; font-size: 0.95rem; white-space: nowrap; }
.nav-menu a.active, .nav-menu a:hover { background: #E0E7FF; color: var(--primary); }
.nav-actions { display: flex; align-items: center; gap: 10px; color: var(--muted); font-weight: 600; white-space: nowrap; font-size: 0.95rem; }

/* Hero */
.hero {
  position: relative;
  background: linear-gradient(120deg, rgba(30,64,175,0.92), rgba(5,150,105,0.65)), url('../images/server_room_modern.png') center/cover no-repeat;
  color: #fff;
  padding: 120px 0 100px;
  overflow: hidden;
}
.hero::after { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(15,23,42,0.15), transparent 50%); }
.hero .container { position: relative; z-index: 1; display: grid; grid-template-columns: repeat(auto-fit,minmax(320px,1fr)); gap: 30px; align-items: center; }
.hero h1 { color: #fff; font-size: 2.8rem; margin-bottom: 18px; }
.hero p { color: rgba(255,255,255,0.9); font-size: 1.08rem; }
.hero .actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 24px; }
.hero-stats { display: grid; grid-template-columns: repeat(auto-fit,minmax(140px,1fr)); gap: 14px; margin-top: 20px; }
.stat-card { padding: 16px; border-radius: 12px; background: rgba(255,255,255,0.12); border: 1px solid rgba(255,255,255,0.15); }
.stat-number { font-size: 1.6rem; font-weight: 800; }
.stat-label { color: rgba(255,255,255,0.85); font-weight: 600; }

/* 页面头部 */
.page-hero { position: relative; background: linear-gradient(135deg, rgba(30,64,175,0.9), rgba(5,150,105,0.7)); color: #fff; padding: 90px 0 70px; overflow: hidden; }
.page-hero::after { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.08), transparent 45%); }
.page-hero .container { position: relative; z-index: 1; display: grid; grid-template-columns: repeat(auto-fit,minmax(320px,1fr)); gap: 24px; align-items: center; }
.page-hero img { border-radius: var(--radius); box-shadow: var(--shadow); }
.breadcrumb { display: inline-flex; align-items: center; gap: 10px; padding: 10px 14px; background: rgba(255,255,255,0.16); border-radius: 999px; color: #fff; font-weight: 600; }
.breadcrumb a { color: #fff; }

/* 卡片 & 网格 */
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); transition: all 0.2s ease; }
.card:hover { transform: translateY(-4px); box-shadow: 0 20px 40px rgba(15, 23, 42, 0.12); }
.card img { border-radius: 10px; margin-bottom: 14px; }
.card-title { font-size: 1.2rem; color: var(--secondary); margin-bottom: 10px; }
.card-text { color: var(--muted); }

.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(auto-fit,minmax(340px,1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit,minmax(260px,1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit,minmax(220px,1fr)); }

/* 标题模块 */
.section-title { text-align: center; margin-bottom: 40px; }
.section-title h2 { display: inline-block; padding-bottom: 10px; border-bottom: 3px solid #C7D2FE; }
.section-title p { color: var(--muted); margin-top: 10px; }
.subheading { color: var(--muted); font-weight: 600; letter-spacing: 0.5px; text-transform: uppercase; }

/* 产品分类 */
.category-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(240px,1fr)); gap: 16px; }
.category-card { border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; background: #fff; box-shadow: var(--shadow); }
.category-card h3 { color: var(--primary); margin-bottom: 8px; }
.category-card ul { list-style: none; color: var(--muted); }
.category-card li { padding: 6px 0; display: flex; align-items: center; gap: 8px; }
.category-card li::before { content: '•'; color: var(--green); font-weight: 900; }

/* 解决方案Tab */
.tab-nav { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; margin-bottom: 20px; }
.tab-button { padding: 10px 18px; border-radius: 999px; border: 1px solid var(--border); background: #fff; color: var(--secondary); font-weight: 700; cursor: pointer; transition: all 0.2s ease; }
.tab-button.active, .tab-button:hover { background: #E0E7FF; border-color: #C7D2FE; color: var(--primary); }
.tab-panel { display: none; }
.tab-panel.active { display: grid; grid-template-columns: repeat(auto-fit,minmax(280px,1fr)); gap: 18px; align-items: start; }

.solution-box { border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; background: #fff; box-shadow: var(--shadow); }
.solution-box h3 { color: var(--primary); margin-bottom: 10px; }
.solution-box ul { margin-left: 18px; color: var(--muted); }

/* 品牌墙 */
.brand-wall { display: grid; grid-template-columns: repeat(auto-fit,minmax(160px,1fr)); gap: 12px; }
.brand-item { border: 1px dashed var(--border); border-radius: var(--radius); padding: 12px; text-align: center; font-weight: 700; color: var(--secondary); background: #fff; }

/* 优势/流程 */
.adv-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(240px,1fr)); gap: 18px; }
.adv-card { padding: 18px; border-radius: var(--radius); border: 1px solid var(--border); background: #fff; box-shadow: var(--shadow); }
.adv-card strong { color: var(--primary); font-size: 1.1rem; }
.process-steps { display: grid; grid-template-columns: repeat(auto-fit,minmax(200px,1fr)); gap: 12px; margin-top: 18px; }
.process-step { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; color: var(--secondary); box-shadow: var(--shadow); }

/* 列表 & 数据 */
.list-check { list-style: none; color: var(--muted); }
.list-check li { padding: 8px 0; display: flex; gap: 10px; }
.list-check li::before { content: '✓'; color: var(--green); font-weight: 800; }

.table { width: 100%; border-collapse: collapse; margin-top: 14px; }
.table th, .table td { padding: 12px; border: 1px solid var(--border); text-align: left; }
.table th { background: #E0E7FF; color: var(--secondary); }
.table tr:nth-child(even) { background: #F8FAFC; }

/* 信息块 */
.panel { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }
.highlight { color: var(--orange); font-weight: 700; }
.muted { color: var(--muted); }

/* 表单 */
.form-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(280px,1fr)); gap: 16px; }
input, textarea, select { width: 100%; padding: 12px; border-radius: 10px; border: 1px solid var(--border); background: #fff; font-size: 1rem; }
textarea { min-height: 120px; resize: vertical; }
input:focus, textarea:focus, select:focus { outline: 2px solid #C7D2FE; border-color: var(--primary); }
.form-group label { display: block; font-weight: 600; margin-bottom: 6px; color: var(--secondary); }

/* 页脚 */
.site-footer { background: #0B1531; color: var(--footer-text); padding: 60px 0 30px; margin-top: 60px; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(220px,1fr)); gap: 22px; margin-bottom: 30px; }
.footer-grid h4 { color: inherit; margin-bottom: 12px; }
.footer-grid ul { list-style: none; color: inherit; }
.footer-grid li { padding: 6px 0; color: inherit; }
.site-footer p { color: inherit; }
.footer-grid a { color: inherit; }
.footer-grid a:hover { color: #fff; }
.site-footer .pill { color: var(--footer-text); background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.18); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 16px; text-align: center; color: inherit; font-size: 0.95rem; }

/* 其他模块 */
.case-card { display: grid; gap: 10px; }
.case-meta { display: flex; gap: 10px; flex-wrap: wrap; color: var(--muted); font-weight: 600; }
.news-card { display: grid; gap: 10px; }

.cta-section { background: linear-gradient(120deg, var(--primary), #0f6fb5); color: #fff; padding: 60px; border-radius: 16px; position: relative; overflow: hidden; box-shadow: var(--shadow); }
.cta-section::after { content: ''; position: absolute; width: 160px; height: 160px; right: -40px; top: -40px; background: rgba(255,255,255,0.08); border-radius: 50%; }
.cta-section h3 { color: #fff; margin-bottom: 10px; }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(180px,1fr)); gap: 12px; }
.stat-block { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; box-shadow: var(--shadow); }
.stat-block strong { display: block; font-size: 1.4rem; color: var(--primary); }
.stat-block span { color: var(--muted); font-weight: 600; }

.list-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(260px,1fr)); gap: 12px; }

.icon-circle { width: 38px; height: 38px; border-radius: 50%; background: #E0E7FF; color: var(--primary); display: inline-flex; align-items: center; justify-content: center; font-weight: 800; }

/* 辅助类 */
.mt-10 { margin-top: 10px; }
.mt-20 { margin-top: 20px; }
.mt-30 { margin-top: 30px; }
.mt-40 { margin-top: 40px; }
.mt-60 { margin-top: 60px; }
.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }
.mb-40 { margin-bottom: 40px; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-wrap { flex-wrap: wrap; }

/* 响应式 */
@media (max-width: 960px) {
  .navbar .container { flex-direction: column; align-items: flex-start; }
  .nav-actions { width: 100%; justify-content: space-between; }
  .hero h1 { font-size: 2.2rem; }
  section { padding: 60px 0; }
}

@media (max-width: 640px) {
  .nav-menu { gap: 10px; }
  .btn { width: 100%; justify-content: center; }
  .cta-section { padding: 30px 20px; }
}