/* ====================================================================
   上邦企业 AI 数字化转型官网 - 全站主样式
   风格：科技极简 / 工业高端 / B 端专业务实
   品牌色：工业深蓝 + 科技亮蓝 + 转化橙
==================================================================== */

:root {
  --sb-primary: #0b3d91;          /* 上邦主色：工业深蓝 */
  --sb-primary-dark: #062a66;
  --sb-accent: #0066ff;           /* 科技亮蓝 */
  --sb-cta: #ff6b35;              /* 转化橙 */
  --sb-cta-dark: #e85a26;
  --sb-text: #1a1a1a;
  --sb-text-sub: #4a5568;
  --sb-text-muted: #718096;
  --sb-border: #e2e8f0;
  --bg: #ffffff;
  --bg-soft: #f7fafc;
  --bg-section: #f1f5f9;
  --max-w: 1200px;
  --shadow-sm: 0 1px 2px rgba(11,61,145,0.06);
  --shadow-md: 0 4px 16px rgba(11,61,145,0.08);
  --shadow-lg: 0 12px 32px rgba(11,61,145,0.12);
  --radius: 6px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
  color: var(--sb-text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--sb-accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--sb-cta); }
img { max-width: 100%; display: block; }
ul, ol { padding-left: 1.4em; }
h1, h2, h3, h4 { color: var(--sb-primary); font-weight: 700; line-height: 1.35; margin: 0 0 .5em; }
h1 { font-size: 32px; }
h2 { font-size: 26px; }
h3 { font-size: 20px; }
h4 { font-size: 17px; }

/* ====== 顶部导航 ====== */
.sb-topbar {
  background: var(--sb-primary);
  color: #fff;
  font-size: 13px;
  padding: 6px 0;
}
.sb-topbar .inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.sb-topbar a { color: #cfe0ff; }
.sb-topbar a:hover { color: #fff; }

.sb-header {
  background: #fff;
  border-bottom: 1px solid var(--sb-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}
.sb-header .inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

/* Logo（上邦官网正式 Logo） */
.sb-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 22px;
  color: var(--sb-primary);
  text-decoration: none;
  letter-spacing: 1px;
}
.sb-logo-img {
  height: 44px;
  width: auto;
  display: block;
}
@media (max-width: 600px) {
  .sb-logo-img { height: 34px; }
}
.sb-logo .logo-mark {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--sb-primary) 0%, var(--sb-accent) 100%);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 20px;
  font-weight: 800;
  border-radius: 6px;
  box-shadow: var(--shadow-sm);
}
.sb-logo .logo-text small {
  display: block;
  font-size: 11px;
  font-weight: 400;
  color: var(--sb-text-muted);
  letter-spacing: .5px;
  margin-top: 2px;
}

/* 主导航 */
.sb-nav { display: flex; align-items: center; gap: 4px; }
.sb-nav a {
  display: inline-block;
  padding: 10px 14px;
  color: var(--sb-text);
  font-size: 15px;
  font-weight: 500;
  border-radius: 4px;
  transition: all .2s;
  white-space: nowrap;
}
.sb-nav a:hover { background: var(--bg-soft); color: var(--sb-primary); }
.sb-nav a.active { color: var(--sb-primary); background: var(--bg-soft); font-weight: 700; }
.sb-nav-toggle { display: none; background: none; border: 0; font-size: 24px; color: var(--sb-primary); cursor: pointer; }

.sb-header .header-cta {
  background: var(--sb-cta);
  color: #fff;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 14px;
  white-space: nowrap;
}
.sb-header .header-cta:hover { background: var(--sb-cta-dark); color: #fff; }

/* ====== Banner 横幅 ====== */
.sb-banner {
  background: linear-gradient(135deg, #0b3d91 0%, #062a66 60%, #021a44 100%);
  color: #fff;
  padding: 80px 0 70px;
  position: relative;
  overflow: hidden;
}
.sb-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(800px 300px at 80% 20%, rgba(0,102,255,0.25), transparent 60%),
    radial-gradient(600px 300px at 10% 90%, rgba(255,107,53,0.12), transparent 60%);
  pointer-events: none;
}
.sb-banner .inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
}
.sb-banner h1 {
  color: #fff;
  font-size: 36px;
  line-height: 1.3;
  margin: 0 0 16px;
  max-width: 900px;
}
.sb-banner h1 .accent { color: #ffc857; }
.sb-banner .subtitle {
  font-size: 17px;
  color: #cfe0ff;
  max-width: 800px;
  margin: 0 0 28px;
}
.sb-banner .banner-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  border: 0;
  transition: all .2s;
  text-align: center;
}
.btn-cta { background: var(--sb-cta); color: #fff; }
.btn-cta:hover { background: var(--sb-cta-dark); color: #fff; transform: translateY(-1px); }
.btn-ghost { background: transparent; color: #fff; border: 1px solid #ffffff66; }
.btn-ghost:hover { background: #ffffff14; color: #fff; }
.btn-primary { background: var(--sb-primary); color: #fff; }
.btn-primary:hover { background: var(--sb-primary-dark); color: #fff; }

/* ====== 通用容器 ====== */
.sb-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
}
.sb-section { padding: 60px 0; }
.sb-section.alt { background: var(--bg-section); }
.sb-section .section-head {
  text-align: center;
  margin-bottom: 40px;
}
.sb-section .section-head h2 {
  font-size: 30px;
  margin-bottom: 12px;
}
.sb-section .section-head p {
  color: var(--sb-text-sub);
  max-width: 720px;
  margin: 0 auto;
  font-size: 16px;
}
.sb-section .section-head.left {
  text-align: left;
  margin-bottom: 24px;
}
.sb-section .section-head.left h2 { font-size: 34px; }
.sb-section .section-head.left p { margin: 0; max-width: none; }

/* ====== 卡片网格 ====== */
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.card {
  background: #fff;
  border: 1px solid var(--sb-border);
  border-radius: var(--radius);
  padding: 26px;
  transition: all .25s;
  height: 100%;
}
.card:hover {
  border-color: var(--sb-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

/* ====== 数据展示条（大厂风） ====== */
.stat-bar {
  background: linear-gradient(135deg, #0b3d91 0%, #0a2a66 100%);
  color: #fff;
  padding: 38px 0;
  position: relative;
  overflow: hidden;
}
.stat-bar::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(600px 200px at 20% 50%, rgba(0,102,255,0.18), transparent 70%);
  pointer-events: none;
}
.stat-bar .inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  position: relative;
}
@media (max-width: 700px) { .stat-bar .inner { grid-template-columns: repeat(2, 1fr); } }
.stat-bar .stat-item { text-align: center; }
.stat-bar .stat-num {
  font-size: 38px;
  font-weight: 800;
  color: #ffc857;
  line-height: 1;
  letter-spacing: 1px;
}
.stat-bar .stat-label {
  font-size: 14px;
  color: #cfe0ff;
  margin-top: 6px;
}

/* ====== 大卡片（特色业务 / 行业方案 / 自研产品） ====== */
.big-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--sb-border);
  border-radius: 10px;
  padding: 32px 28px;
  height: 100%;
  transition: all .3s;
  overflow: hidden;
}
.big-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--sb-accent);
}
.big-card .bc-num {
  position: absolute;
  top: 18px;
  right: 22px;
  font-size: 48px;
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(135deg, #0b3d91 0%, #0066ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  opacity: 0.15;
  pointer-events: none;
}
.big-card .bc-icon {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  margin-bottom: 18px;
  color: #fff;
}
.big-card .bc-icon .bc-svg {
  display: block;
}
.bc-icon.bc-blue   { background: linear-gradient(135deg, #0b3d91, #0066ff); }
.bc-icon.bc-orange { background: linear-gradient(135deg, #ff6b35, #ff9966); }
.bc-icon.bc-green  { background: linear-gradient(135deg, #2bb673, #1e8e3e); }
.bc-icon.bc-purple { background: linear-gradient(135deg, #6f42c1, #b07ee0); }
.bc-icon.bc-teal   { background: linear-gradient(135deg, #1b9aaa, #4ecdc4); }
.bc-icon.bc-red    { background: linear-gradient(135deg, #d6336c, #ff6b9d); }
.big-card h3 { margin-bottom: 8px; font-size: 19px; }
.big-card p { color: var(--sb-text-sub); margin: 0; font-size: 14.5px; line-height: 1.75; }
.big-card .bc-tags {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.big-card .bc-tags span {
  display: inline-block;
  background: #eef4ff;
  color: var(--sb-primary);
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 12px;
}

/* ====== 痛点左叙述 + 右2x2 卡片 ====== */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
@media (max-width: 600px) { .pain-grid { grid-template-columns: 1fr; } }
.pain-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--sb-border);
  border-radius: 10px;
  padding: 26px 22px;
  transition: all .25s;
  overflow: hidden;
}
.pain-card:hover {
  border-color: var(--sb-cta);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.pain-card .pain-num {
  position: absolute;
  top: 8px;
  right: 18px;
  font-size: 56px;
  font-weight: 900;
  line-height: 1;
  color: var(--sb-cta);
  opacity: 0.1;
}
.pain-card .pain-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, #ff6b35, #ff9966);
  color: #fff;
  border-radius: 10px;
  display: grid;
  place-items: center;
  font-size: 22px;
  margin-bottom: 12px;
}
.pain-card h3 { margin-bottom: 6px; font-size: 18px; position: relative; z-index: 1; }
.pain-card p { color: var(--sb-text-sub); margin: 0; font-size: 13.5px; line-height: 1.7; position: relative; z-index: 1; }

/* ====== 痛点左叙述文字 ====== */
.pain-intro h2 { font-size: 36px; line-height: 1.3; margin-bottom: 18px; }
.pain-intro p { font-size: 16.5px; color: var(--sb-text-sub); margin-bottom: 28px; line-height: 1.85; }
.pain-stats { display: grid; gap: 18px; }
.pain-stats .row { display: flex; align-items: center; gap: 16px; }
.pain-stats .pct {
  flex: none;
  font-size: 44px;
  font-weight: 900;
  line-height: 1;
}
.pain-stats .pct.blue { color: var(--sb-primary); }
.pain-stats .pct.orange { color: var(--sb-cta); }
.pain-stats .desc { font-size: 14.5px; color: var(--sb-text-sub); line-height: 1.5; }

/* ====== 升级的卡片图标 ====== */
.card .card-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--sb-primary), var(--sb-accent));
  color: #fff;
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-size: 22px;
  margin-bottom: 14px;
}
.card h3 { margin-bottom: 8px; }
.card p { color: var(--sb-text-sub); font-size: 14.5px; margin: 0; }
.card .card-link {
  display: inline-block;
  margin-top: 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--sb-accent);
}

/* 痛点 / 优势样式 */
.feat-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 16px; }
.feat-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: #fff;
  border: 1px solid var(--sb-border);
  border-radius: var(--radius);
  padding: 18px 20px;
  transition: all .2s;
}
.feat-list li:hover { border-color: var(--sb-accent); box-shadow: var(--shadow-sm); }
.feat-list .num {
  flex: none;
  width: 36px;
  height: 36px;
  background: var(--sb-primary);
  color: #fff;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 15px;
}
.feat-list h4 { margin: 0 0 4px; }
.feat-list p { margin: 0; color: var(--sb-text-sub); font-size: 14px; }

/* 流程步骤 */
.flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  position: relative;
}
@media (max-width: 800px) { .flow { grid-template-columns: 1fr 1fr; } }
@media (max-width: 500px) { .flow { grid-template-columns: 1fr; } }
.flow .step {
  text-align: center;
  padding: 24px 16px;
  position: relative;
}
.flow .step .n {
  width: 56px;
  height: 56px;
  margin: 0 auto 12px;
  background: #fff;
  border: 2px solid var(--sb-accent);
  color: var(--sb-accent);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 20px;
}
.flow .step h4 { margin: 0 0 4px; }
.flow .step p { margin: 0; color: var(--sb-text-sub); font-size: 13.5px; }

/* 案例卡片 */
.case-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--sb-border);
  transition: all .25s;
}
.case-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.case-card .case-img {
  height: 180px;
  background: linear-gradient(135deg, #0b3d91, #0066ff);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 1px;
}
.case-card .case-body { padding: 20px; }
.case-card .case-body h3 { font-size: 17px; margin-bottom: 6px; }
.case-card .case-body p { color: var(--sb-text-sub); font-size: 14px; margin: 0; }
.case-card .case-tag {
  display: inline-block;
  background: #eef4ff;
  color: var(--sb-primary);
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 12px;
  margin-bottom: 8px;
}

/* 文章卡片 */
.news-card {
  background: #fff;
  border: 1px solid var(--sb-border);
  border-radius: var(--radius);
  padding: 22px;
  transition: all .25s;
}
.news-card:hover { border-color: var(--sb-accent); box-shadow: var(--shadow-sm); }
.news-card .date { color: var(--sb-text-muted); font-size: 13px; }
.news-card h3 { font-size: 17px; margin: 6px 0 8px; }
.news-card p { color: var(--sb-text-sub); font-size: 14px; margin: 0; }

/* 表单 */
.sb-form {
  background: #fff;
  border: 1px solid var(--sb-border);
  border-radius: var(--radius);
  padding: 30px;
  max-width: 640px;
  margin: 0 auto;
  box-shadow: var(--shadow-sm);
}
.sb-form .form-row { margin-bottom: 16px; }
.sb-form label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--sb-text);
  margin-bottom: 6px;
}
.sb-form .form-row label::after { content: " *"; color: var(--sb-cta); }
.sb-form input, .sb-form select, .sb-form textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--sb-border);
  border-radius: 4px;
  font-size: 14.5px;
  font-family: inherit;
  background: #fff;
  transition: border-color .2s;
}
.sb-form input:focus, .sb-form select:focus, .sb-form textarea:focus {
  outline: none;
  border-color: var(--sb-accent);
}
.sb-form textarea { min-height: 100px; resize: vertical; }
.sb-form .btn { width: 100%; }
.sb-form .form-tip { font-size: 12px; color: var(--sb-text-muted); margin-top: 6px; }

/* ====== 底部 ====== */
.sb-footer {
  background: #0a1e44;
  color: #cbd5e0;
  padding: 50px 0 0;
  margin-top: 60px;
}
.sb-footer .inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1fr;
  gap: 28px;
}
@media (max-width: 800px) { .sb-footer .inner { grid-template-columns: 1fr 1fr; gap: 28px; } }
@media (max-width: 500px) { .sb-footer .inner { grid-template-columns: 1fr; } }

/* 品牌区（紧凑） */
.sb-footer .footer-brand .fb-logo img { height: 30px; width: auto; }
.sb-footer .footer-brand .fb-desc {
  font-size: 13px;
  color: #8a9bb5;
  line-height: 1.75;
  margin: 12px 0 16px;
}
.sb-footer .footer-brand .fb-icp {
  font-size: 12px;
  color: #6b7a92;
}
.sb-footer .footer-brand .fb-icp a { color: #6b7a92; display: inline; padding: 0; font-size: 12px; }
.sb-footer .footer-brand .fb-icp a:hover { color: #cbd5e0; }

/* 链接列（紧凑） */
.sb-footer .footer-col h4 {
  color: #fff;
  font-size: 14px;
  margin-bottom: 12px;
  position: relative;
  padding-bottom: 6px;
}
.sb-footer .footer-col h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 18px;
  height: 2px;
  background: var(--sb-cta);
}
.sb-footer .footer-col a {
  color: #aab8d0;
  display: block;
  padding: 3px 0;
  font-size: 13px;
  transition: all .2s;
}
.sb-footer .footer-col a:hover {
  color: #fff;
  padding-left: 4px;
}
.sb-footer .copyright {
  border-top: 1px solid #ffffff14;
  margin-top: 32px;
  padding: 14px 0;
  text-align: center;
  font-size: 12.5px;
  color: #6b7a92;
}

/* 全站底部统一的咨询转化条 */
.sb-cta-bar {
  background: linear-gradient(135deg, var(--sb-primary) 0%, var(--sb-accent) 100%);
  color: #fff;
  padding: 40px 0;
  text-align: center;
}
.sb-cta-bar h3 { color: #fff; font-size: 24px; margin: 0 0 8px; }
.sb-cta-bar p { margin: 0 0 18px; color: #d8e7ff; }

/* 二级菜单：滚动到当前位置高亮 */
.sb-nav a:hover, .sb-nav a.active {}

/* 通用 */
.section-lead { font-size: 16px; color: var(--sb-text-sub); }
.text-muted { color: var(--sb-text-muted); }
.mt-20 { margin-top: 20px; }
.mt-30 { margin-top: 30px; }
.mt-40 { margin-top: 40px; }
.text-center { text-align: center; }

/* ====== 移动端 ====== */
@media (max-width: 900px) {
  .sb-nav { display: none; position: absolute; top: 100%; left: 0; right: 0; background: #fff; flex-direction: column; align-items: stretch; border-bottom: 1px solid var(--sb-border); box-shadow: var(--shadow-md); padding: 10px 0; }
  .sb-nav.open { display: flex; }
  .sb-nav a { padding: 12px 20px; }
  .sb-nav-toggle { display: block; }
  .sb-header .header-cta { display: none; }
  .sb-banner h1 { font-size: 26px; }
  .sb-banner { padding: 50px 0 40px; }
  h1 { font-size: 26px; }
  h2 { font-size: 22px; }
  .sb-section { padding: 40px 0; }
}