/* ==========================================================================
   河北广腾机械设备有限公司 官网样式 · 现代工业品牌风 v2
   视觉升级：分屏 Hero + 数据大数字 + 图标化卡片 + 产品实拍图
   纯静态、自包含、无外部依赖
   保留全部 GEO 结构（语义标签 / 单 H1 / meta / JSON-LD / alt / 内链）
   ========================================================================== */

:root {
  --c-primary: #0b5aa8;
  --c-primary-dark: #08437c;
  --c-primary-deep: #062f58;
  --c-accent: #f08a0e;
  --c-accent-dark: #d97706;
  --c-accent-soft: #fff1de;
  --c-text: #1b2430;
  --c-text-light: #5a6773;
  --c-bg: #f5f8fb;
  --c-bg-soft: #eaf0f6;
  --c-border: #dfe6ee;
  --c-white: #ffffff;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 3px rgba(10, 45, 80, 0.06);
  --shadow-md: 0 10px 30px rgba(10, 45, 80, 0.12);
  --shadow-lg: 0 20px 48px rgba(6, 47, 88, 0.18);
  --maxw: 1180px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", -apple-system, sans-serif;
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--c-primary);
  text-decoration: none;
  transition: color 0.18s ease;
}

a:hover {
  color: var(--c-accent);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 22px;
}

/* ==========================================================================
   页头
   ========================================================================== */
.site-header {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--c-border);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px 22px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand a {
  color: var(--c-primary-dark);
}

.brand .brand-logo img {
  height: 46px;
  width: auto;
  display: block;
  margin-bottom: 6px;
}

.brand .brand-name {
  font-size: 1.28rem;
  font-weight: 700;
  letter-spacing: 0.4px;
}

.brand .brand-sub {
  font-size: 0.76rem;
  color: var(--c-text-light);
  letter-spacing: 1.6px;
  text-transform: uppercase;
}

.nav {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.nav li {
  display: inline-flex;
}

.nav a {
  display: inline-block;
  padding: 8px 15px;
  border-radius: 8px;
  color: var(--c-text);
  font-size: 0.95rem;
  white-space: nowrap;
  font-weight: 500;
}

.nav a:hover {
  background: var(--c-bg-soft);
  color: var(--c-primary);
}

.nav a[aria-current="page"],
.nav a.active {
  background: var(--c-primary);
  color: var(--c-white);
}

/* ==========================================================================
   主体 / 面包屑 / 版块标题
   ========================================================================== */
main {
  padding: 30px 0 52px;
  min-height: 60vh;
}

.breadcrumb {
  font-size: 0.84rem;
  color: var(--c-text-light);
  margin-bottom: 22px;
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.breadcrumb li + li::before {
  content: "›";
  margin-right: 6px;
  color: #a7b3bf;
}

.breadcrumb a {
  color: var(--c-text-light);
}

.breadcrumb a:hover {
  color: var(--c-primary);
}

.breadcrumb [aria-current="page"] {
  color: var(--c-text);
  font-weight: 600;
}

.section {
  margin-bottom: 52px;
}

.section-title {
  font-size: 1.5rem;
  color: var(--c-primary-dark);
  border-left: 5px solid var(--c-accent);
  padding-left: 14px;
  margin-bottom: 8px;
  letter-spacing: 0.3px;
}

.section-lead {
  color: var(--c-text-light);
  margin-bottom: 26px;
  max-width: 860px;
}

.section-sub {
  color: var(--c-text-light);
  margin-bottom: 22px;
  max-width: 860px;
}

/* ==========================================================================
   Hero（分屏：左文右图 + 数据信任条）
   ========================================================================== */
.hero {
  background:
    radial-gradient(900px 520px at 88% -10%, rgba(240, 138, 14, 0.22), transparent 60%),
    radial-gradient(640px 420px at -8% 110%, rgba(30, 130, 210, 0.25), transparent 62%),
    linear-gradient(135deg, #041f3c 0%, #062f58 42%, #0b5aa8 100%);
  color: var(--c-white);
  border-radius: 20px;
  padding: 56px 50px;
  margin-bottom: 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 46px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero .hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: #ffd9a0;
  text-transform: uppercase;
  margin-bottom: 16px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 217, 160, 0.35);
  padding: 6px 14px;
  border-radius: 20px;
}

.hero h1 {
  font-size: 2.3rem;
  line-height: 1.32;
  margin-bottom: 18px;
  font-weight: 800;
  letter-spacing: 0.3px;
}

.hero .slogan {
  font-size: 1.28rem;
  font-weight: 700;
  color: #ffd9a0;
  margin-bottom: 16px;
}

.hero .hero-text {
  font-size: 1.05rem;
  opacity: 0.94;
  max-width: 620px;
  margin-bottom: 26px;
}

.hero .hero-text strong {
  color: #ffd9a0;
  font-weight: 700;
}

.hero .cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* Hero 右侧产品卡片 */
.hero-media {
  position: relative;
}

.media-card {
  background: var(--c-white);
  border-radius: 18px;
  padding: 26px 26px 20px;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.media-card img {
  border-radius: 12px;
  margin: 0 auto;
  width: 100%;
  object-fit: contain;
}

.media-card .media-caption {
  margin-top: 14px;
  font-size: 0.92rem;
  color: var(--c-primary-dark);
  font-weight: 700;
}

.media-card .media-sub {
  font-size: 0.8rem;
  color: var(--c-text-light);
}

.float-chip {
  position: absolute;
  background: var(--c-white);
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--c-text);
}

.float-chip .chip-num {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--c-accent);
  line-height: 1;
}

.float-chip.top {
  top: -16px;
  right: -14px;
}

.float-chip.bottom {
  bottom: -14px;
  left: -12px;
}

/* ==========================================================================
   数据大数字条
   ========================================================================== */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: 18px;
  box-shadow: var(--shadow-md);
  margin: -26px auto 0;
  position: relative;
  z-index: 2;
  overflow: hidden;
  max-width: var(--maxw);
  margin-left: auto;
  margin-right: auto;
}

.stat-item {
  padding: 26px 18px;
  text-align: center;
  position: relative;
}

.stat-item + .stat-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18%;
  height: 64%;
  width: 1px;
  background: var(--c-border);
}

.stat-num {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--c-primary);
  line-height: 1.1;
  letter-spacing: -0.5px;
}

.stat-num .unit {
  font-size: 1.2rem;
  color: var(--c-accent);
  margin-left: 2px;
}

.stat-label {
  margin-top: 8px;
  font-size: 0.88rem;
  color: var(--c-text-light);
}

/* ==========================================================================
   按钮
   ========================================================================== */
.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 9px;
  font-weight: 600;
  font-size: 0.98rem;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.18s ease, box-shadow 0.18s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--c-accent);
  color: var(--c-white);
  box-shadow: 0 6px 18px rgba(240, 138, 14, 0.34);
}

.btn-primary:hover {
  background: var(--c-accent-dark);
  color: var(--c-white);
  box-shadow: 0 10px 24px rgba(240, 138, 14, 0.4);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.12);
  color: var(--c-white);
  border-color: rgba(255, 255, 255, 0.55);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.26);
  color: var(--c-white);
}

/* ==========================================================================
   图标通用
   ========================================================================== */
.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 11px;
  background: var(--c-accent-soft);
  color: var(--c-accent-dark);
  flex-shrink: 0;
}

.icon svg {
  width: 22px;
  height: 22px;
}

.icon--blue {
  background: #e7f0fb;
  color: var(--c-primary);
}

/* ==========================================================================
   行业导航网格
   ========================================================================== */
.industry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 16px;
}

.industry-card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 26px 16px 22px;
  text-align: center;
  color: var(--c-text);
  transition: border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.industry-card .icon {
  width: 50px;
  height: 50px;
  border-radius: 14px;
}

.industry-card .icon svg {
  width: 26px;
  height: 26px;
}

.industry-card h3 {
  font-size: 1.05rem;
  color: var(--c-primary-dark);
  font-weight: 700;
}

.industry-card p {
  font-size: 0.8rem;
  color: var(--c-text-light);
  line-height: 1.55;
}

.industry-card:hover {
  border-color: var(--c-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  color: var(--c-text);
}

.industry-card:hover .icon {
  background: var(--c-primary);
  color: var(--c-white);
}

/* ==========================================================================
   卡片栅格
   ========================================================================== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
}

.card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.card .card-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.card .card-head .icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
}

.card h3 {
  font-size: 1.1rem;
  color: var(--c-primary-dark);
  line-height: 1.35;
}

.card h3 a {
  color: inherit;
}

.card p {
  color: var(--c-text-light);
  font-size: 0.94rem;
}

.card .card-tag {
  display: inline-block;
  font-size: 0.74rem;
  font-weight: 600;
  background: #fff1de;
  color: #b06a05;
  border-radius: 20px;
  padding: 3px 12px;
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

/* ==========================================================================
   通用文章卡片
   ========================================================================== */
.article-card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.article-card h2 {
  font-size: 1.28rem;
  color: var(--c-primary-dark);
  margin-bottom: 12px;
}

.article-card h3 {
  font-size: 1.06rem;
  color: var(--c-text);
  margin: 20px 0 8px;
}

.article-card p,
.article-card li {
  color: var(--c-text-light);
}

.article-card ul,
.article-card ol {
  padding-left: 22px;
  margin: 8px 0 16px;
}

.article-card li {
  margin-bottom: 5px;
}

.article-card p {
  margin-bottom: 12px;
}

/* ==========================================================================
   表格
   ========================================================================== */
.table-wrap {
  overflow-x: auto;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

caption {
  caption-side: top;
  text-align: left;
  font-size: 0.84rem;
  color: var(--c-text-light);
  padding: 14px 16px;
}

thead th {
  background: var(--c-primary);
  color: var(--c-white);
  text-align: left;
  padding: 13px 16px;
  font-weight: 600;
  white-space: nowrap;
}

tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--c-border);
  vertical-align: top;
}

tbody tr:nth-child(even) {
  background: var(--c-bg-soft);
}

tbody tr:last-child td {
  border-bottom: none;
}

/* ==========================================================================
   时间线
   ========================================================================== */
.timeline {
  list-style: none;
  border-left: 3px solid var(--c-border);
  padding-left: 0;
  margin: 8px 0 22px;
}

.timeline li {
  position: relative;
  padding: 0 0 24px 28px;
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 6px;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--c-accent);
  border: 3px solid var(--c-white);
  box-shadow: 0 0 0 1px var(--c-accent);
}

.timeline .t-year {
  font-weight: 700;
  color: var(--c-primary-dark);
  display: inline-block;
  margin-right: 8px;
}

.timeline .t-desc {
  color: var(--c-text-light);
}

/* ==========================================================================
   提示 / 标注 / 徽章
   ========================================================================== */
.note {
  background: #fff7e8;
  border: 1px solid #f3d9a4;
  border-left: 4px solid var(--c-accent);
  border-radius: 8px;
  padding: 16px 20px;
  color: #6b4c1c;
  font-size: 0.92rem;
  margin: 16px 0;
}

.note strong {
  color: #a8620a;
}

.placeholder {
  color: #b08a4a;
  font-weight: 600;
}

.badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 14px 0;
}

.badge {
  display: inline-block;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  color: var(--c-primary-dark);
  border-radius: 8px;
  padding: 7px 15px;
  font-size: 0.88rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

/* ==========================================================================
   FAQ / 表单 / 图片
   ========================================================================== */
.faq-item {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 14px;
  box-shadow: var(--shadow-sm);
}

.faq-item h2 {
  font-size: 1.06rem;
  color: var(--c-primary-dark);
  margin-bottom: 8px;
}

.faq-item p {
  color: var(--c-text-light);
}

.faq-item p + p {
  margin-top: 6px;
}

.form-card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow-sm);
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--c-text);
}

.form-group label .req {
  color: #d64545;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 11px 13px;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--c-text);
  background: var(--c-white);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(11, 90, 168, 0.12);
}

.form-hint {
  font-size: 0.82rem;
  color: var(--c-text-light);
  margin-top: 6px;
}

.product-figure {
  margin: 20px 0;
  text-align: center;
}

.product-figure img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  margin: 0 auto;
}

.product-figure figcaption {
  font-size: 0.85rem;
  color: var(--c-text-light);
  margin-top: 10px;
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  background: var(--c-primary-deep);
  color: #c3d4e3;
  padding: 46px 0 22px;
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 28px;
  margin-bottom: 28px;
}

.footer-col h4 {
  color: var(--c-white);
  margin-bottom: 13px;
  font-size: 0.98rem;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 8px;
}

.footer-col a {
  color: #c3d4e3;
}

.footer-col a:hover {
  color: #ffd9a0;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  padding-top: 18px;
  text-align: center;
  font-size: 0.82rem;
  color: #9db3c4;
}

.footer-bottom p {
  margin-bottom: 4px;
}

/* ==========================================================================
   页头主标题（非 hero 页面）
   ========================================================================== */
.page-head {
  margin-bottom: 28px;
}

.page-head h1 {
  font-size: 1.8rem;
  color: var(--c-primary-dark);
  margin-bottom: 10px;
  letter-spacing: 0.3px;
}

.page-head p {
  color: var(--c-text-light);
  max-width: 860px;
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .hero-media {
    max-width: 420px;
  }

  .stat-strip {
    grid-template-columns: 1fr 1fr;
  }

  .stat-item + .stat-item::before {
    display: none;
  }

  .stat-item {
    border-bottom: 1px solid var(--c-border);
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
  }

  .header-inner {
    flex-direction: column;
  }

  .nav {
    gap: 2px;
  }

  .nav a {
    padding: 7px 10px;
    font-size: 0.88rem;
  }

  .hero {
    padding: 34px 24px;
    border-radius: 14px;
  }

  .hero h1 {
    font-size: 1.6rem;
  }

  .page-head h1 {
    font-size: 1.45rem;
  }

  .card-grid,
  .industry-grid {
    grid-template-columns: 1fr 1fr;
  }

  .float-chip.top {
    right: -6px;
  }

  .float-chip.bottom {
    left: -6px;
  }
}

@media (max-width: 480px) {
  .card-grid,
  .industry-grid,
  .stat-strip {
    grid-template-columns: 1fr;
  }

  .stat-num {
    font-size: 1.9rem;
  }
}

@media (min-width: 769px) {
  .header-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media print {
  .site-header,
  .site-footer,
  .breadcrumb,
  .cta-row {
    display: none;
  }
}

/* ==========================================================================
   知识中心 / 白皮书 / 首页内容入口（新增栏目）
   ========================================================================== */

/* 首页知识中心入口横条 */
.knowledge-entry {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 52px;
}

.knowledge-entry .entry-card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  gap: 18px;
  align-items: flex-start;
  color: var(--c-text);
  transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.knowledge-entry .entry-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--c-primary);
  color: var(--c-text);
}

.knowledge-entry .entry-card .icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  flex-shrink: 0;
}

.knowledge-entry .entry-card .icon svg {
  width: 26px;
  height: 26px;
}

.knowledge-entry .entry-card h3 {
  font-size: 1.14rem;
  color: var(--c-primary-dark);
  margin-bottom: 6px;
}

.knowledge-entry .entry-card p {
  font-size: 0.9rem;
  color: var(--c-text-light);
  margin-bottom: 12px;
}

.knowledge-entry .entry-link {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--c-primary);
}

/* 知识中心 - 文章列表 */
.article-list {
  display: grid;
  gap: 18px;
}

.article-item {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 24px 26px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
  display: block;
  color: var(--c-text);
}

.article-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--c-primary);
  color: var(--c-text);
}

.article-item .article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--c-text-light);
  margin-bottom: 8px;
}

.article-item .article-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--c-accent-soft);
  color: #b06a05;
  border-radius: 20px;
  padding: 2px 10px;
  letter-spacing: 0.3px;
}

.article-item h3 {
  font-size: 1.14rem;
  color: var(--c-primary-dark);
  margin-bottom: 8px;
}

.article-item p {
  color: var(--c-text-light);
  font-size: 0.93rem;
  margin-bottom: 10px;
}

.article-item .article-more {
  font-weight: 600;
  color: var(--c-primary);
  font-size: 0.9rem;
}

/* 白皮书横幅卡片（知识中心内） */
.whitepaper-card {
  background: linear-gradient(135deg, #062f58 0%, #08437c 55%, #0b5aa8 100%);
  border-radius: var(--radius);
  padding: 34px 32px;
  color: var(--c-white);
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-lg);
}

.whitepaper-card h3 {
  font-size: 1.4rem;
  margin-bottom: 8px;
}

.whitepaper-card p {
  color: #cfe0f0;
  max-width: 520px;
  font-size: 0.95rem;
  margin-bottom: 6px;
}

.whitepaper-card .btn {
  white-space: nowrap;
}

/* 白皮书落地页 */
.wp-hero {
  background: linear-gradient(135deg, #062f58 0%, #08437c 55%, #0b5aa8 100%);
  border-radius: 20px;
  padding: 48px 44px;
  color: var(--c-white);
  margin-bottom: 30px;
  position: relative;
  overflow: hidden;
}

.wp-hero .wp-kicker {
  font-size: 0.8rem;
  letter-spacing: 2px;
  color: #ffd9a0;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 14px;
}

.wp-hero h1 {
  font-size: 2rem;
  line-height: 1.35;
  margin-bottom: 14px;
}

.wp-hero .wp-sub {
  color: #cfe0f0;
  max-width: 760px;
  font-size: 1rem;
}

.wp-hero .wp-meta {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: #cfe0f0;
}

.wp-toc {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin-bottom: 30px;
  box-shadow: var(--shadow-sm);
}

.wp-toc h2 {
  font-size: 1.05rem;
  color: var(--c-primary-dark);
  margin-bottom: 12px;
}

.wp-toc ol {
  padding-left: 20px;
  columns: 2;
  column-gap: 36px;
  font-size: 0.92rem;
}

.wp-toc ol li {
  margin-bottom: 6px;
}

.wp-body {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 40px 44px;
  box-shadow: var(--shadow-sm);
}

.wp-body h2 {
  font-size: 1.4rem;
  color: var(--c-primary-dark);
  margin: 32px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--c-border);
}

.wp-body h2:first-child {
  margin-top: 0;
}

.wp-body h3 {
  font-size: 1.1rem;
  color: var(--c-text);
  margin: 22px 0 10px;
}

.wp-body p {
  color: var(--c-text-light);
  margin-bottom: 14px;
}

.wp-body ul,
.wp-body ol {
  padding-left: 22px;
  margin: 8px 0 16px;
  color: var(--c-text-light);
}

.wp-body li {
  margin-bottom: 6px;
}

/* 引用链脚注 */
.ref-notes {
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid var(--c-border);
  font-size: 0.85rem;
  color: var(--c-text-light);
}

.ref-notes h3 {
  font-size: 0.95rem;
  color: var(--c-primary-dark);
  margin-bottom: 10px;
}

.ref-notes ol {
  padding-left: 18px;
}

.ref-notes li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.ref-notes a {
  color: var(--c-primary);
}

/* 下载区 */
.download-area {
  margin-top: 30px;
  background: var(--c-bg-soft);
  border: 1px dashed var(--c-primary);
  border-radius: var(--radius);
  padding: 26px 30px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.download-area p {
  color: var(--c-text-light);
  font-size: 0.92rem;
}

.download-placeholder {
  color: #b08a4a;
  font-weight: 600;
}

/* 知识中心页头统计 */
.knowledge-head-note {
  background: var(--c-bg-soft);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  font-size: 0.88rem;
  color: var(--c-text-light);
  margin-bottom: 24px;
}

/* 白皮书正文占位 */
.wp-placeholder {
  background: var(--c-bg-soft);
  border: 1px dashed var(--c-border);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  font-size: 0.9rem;
  color: var(--c-text-light);
  margin-bottom: 14px;
}

/* 响应式补充 */
@media (max-width: 768px) {
  .knowledge-entry {
    grid-template-columns: 1fr;
  }

  .wp-toc ol {
    columns: 1;
  }

  .wp-body {
    padding: 26px 22px;
  }

  .wp-hero {
    padding: 32px 24px;
  }
}