/* 北京厚金网络技术开发有限公司 - 官网样式
 * 企业蓝稳重 · 纯静态 · 过审友好
 */

:root {
  --color-primary: #1e40af;
  --color-primary-dark: #1e3a8a;
  --color-primary-light: #3b82f6;
  --color-accent: #0ea5e9;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-bg: #ffffff;
  --color-bg-soft: #f8fafc;
  --color-bg-dark: #0f172a;
  --color-border: #e2e8f0;
  --color-white: #ffffff;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.12);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --max-width: 1200px;
  --header-height: 64px;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Helvetica, Arial,
    sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-primary-dark);
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============ 顶部导航 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--color-border);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 18px;
  color: var(--color-text);
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-text .brand-name {
  font-size: 16px;
  font-weight: 700;
}

.brand-text .brand-tagline {
  font-size: 12px;
  color: var(--color-text-light);
  font-weight: 400;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.main-nav a {
  display: inline-block;
  padding: 8px 16px;
  color: var(--color-text);
  font-size: 15px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

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

.main-nav a.active {
  color: var(--color-primary);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: all 0.2s ease;
}

/* ============ Hero ============ */
.hero {
  position: relative;
  padding: 96px 0 80px;
  background: linear-gradient(135deg, #f0f6ff 0%, #e0ecff 50%, #f8fafc 100%);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  max-width: 720px;
}

.hero-eyebrow {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 20px;
  font-size: 13px;
  color: var(--color-primary);
  background: rgba(59, 130, 246, 0.1);
  border-radius: 999px;
  letter-spacing: 0.5px;
}

.hero h1 {
  font-size: 44px;
  line-height: 1.25;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 20px;
}

.hero-sub {
  font-size: 18px;
  color: var(--color-text-light);
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  font-family: inherit;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

/* ============ 通用区块 ============ */
.section {
  padding: 80px 0;
}

.section-soft {
  background: var(--color-bg-soft);
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-head h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text);
}

.section-head p {
  font-size: 16px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.section-head .eyebrow {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 16px;
  font-size: 12px;
  color: var(--color-primary);
  background: rgba(59, 130, 246, 0.1);
  border-radius: 999px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* ============ 卡片网格 ============ */
.grid {
  display: grid;
  gap: 24px;
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

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

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.card {
  background: var(--color-bg);
  padding: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition: all 0.25s ease;
}

.card:hover {
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 20px;
  font-weight: 700;
}

.card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-text);
}

.card p {
  color: var(--color-text-light);
  line-height: 1.7;
  font-size: 15px;
}

/* ============ 数据展示 ============ */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.stat-num {
  font-size: 40px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 14px;
  color: var(--color-text-light);
}

/* ============ 页面头部（子页） ============ */
.page-hero {
  padding: 64px 0 48px;
  background: linear-gradient(135deg, #f0f6ff 0%, #f8fafc 100%);
  border-bottom: 1px solid var(--color-border);
}

.page-hero h1 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text);
}

.page-hero p {
  color: var(--color-text-light);
  font-size: 16px;
  max-width: 640px;
}

/* ============ 内容布局 ============ */
.content-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 48px;
  align-items: start;
}

.prose {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
}

.prose h2 {
  font-size: 24px;
  font-weight: 600;
  margin: 32px 0 16px;
  color: var(--color-text);
}

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

.prose h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 24px 0 12px;
  color: var(--color-text);
}

.prose p {
  margin-bottom: 16px;
  color: var(--color-text-light);
}

.prose ul {
  margin: 0 0 16px 20px;
}

.prose li {
  margin-bottom: 8px;
  color: var(--color-text-light);
}

/* ============ 时间线 ============ */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: 32px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2);
}

.timeline-year {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.timeline-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.timeline-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ============ 服务列表 ============ */
.service-item {
  display: flex;
  gap: 24px;
  padding: 32px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  transition: all 0.25s ease;
}

.service-item:hover {
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-md);
}

.service-icon {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 700;
}

.service-body h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.service-body p {
  color: var(--color-text-light);
  margin-bottom: 12px;
  line-height: 1.7;
}

.service-body ul {
  margin-left: 18px;
  color: var(--color-text-light);
  font-size: 14px;
}

.service-body li {
  margin-bottom: 4px;
}

/* ============ 新闻列表 ============ */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.news-item {
  display: block;
  padding: 24px 28px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
}

.news-item:hover {
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
  font-size: 13px;
  color: var(--color-text-light);
}

.news-tag {
  padding: 2px 10px;
  background: rgba(59, 130, 246, 0.1);
  color: var(--color-primary);
  border-radius: 999px;
  font-size: 12px;
}

.news-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.news-summary {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ============ 联系页 ============ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  background: var(--color-bg-soft);
  border-radius: var(--radius-md);
}

.contact-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
}

.contact-label {
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 4px;
}

.contact-value {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
}

.contact-form {
  background: var(--color-bg);
  padding: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
}

.form-group label .req {
  color: #dc2626;
  margin-left: 4px;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  font-size: 15px;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

textarea.form-control {
  min-height: 120px;
  resize: vertical;
}

.form-error {
  display: none;
  margin-top: 6px;
  font-size: 13px;
  color: #dc2626;
}

.form-group.has-error .form-control {
  border-color: #dc2626;
}

.form-group.has-error .form-error {
  display: block;
}

.form-note {
  font-size: 13px;
  color: var(--color-text-light);
  margin-top: 12px;
  line-height: 1.6;
}

/* ============ CTA 区 ============ */
.cta {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: var(--color-white);
  padding: 64px 0;
  text-align: center;
}

.cta h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 12px;
}

.cta p {
  font-size: 16px;
  opacity: 0.9;
  margin-bottom: 28px;
}

.cta .btn-primary {
  background: var(--color-white);
  color: var(--color-primary);
}

.cta .btn-primary:hover {
  background: var(--color-bg-soft);
  color: var(--color-primary-dark);
}

/* ============ 页脚 ============ */
.site-footer {
  background: var(--color-bg-dark);
  color: #cbd5e1;
  padding: 56px 0 24px;
}

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

.footer-brand {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 12px;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: #94a3b8;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 16px;
}

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

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: #94a3b8;
  font-size: 14px;
  transition: color 0.2s ease;
}

.footer-col a:hover {
  color: var(--color-white);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid #1e293b;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: #94a3b8;
}

.footer-bottom a {
  color: #94a3b8;
  margin-right: 12px;
}

.footer-bottom a:hover {
  color: var(--color-white);
}

/* ============ 移动端 ============ */
@media (max-width: 960px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .content-grid {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 16px;
    gap: 4px;
    transform: translateY(-120%);
    transition: transform 0.25s ease;
    box-shadow: var(--shadow-md);
  }

  .main-nav.open {
    transform: translateY(0);
  }

  .main-nav a {
    width: 100%;
    padding: 12px 16px;
  }

  .hero {
    padding: 56px 0 48px;
  }

  .hero h1 {
    font-size: 30px;
  }

  .hero-sub {
    font-size: 16px;
  }

  .section {
    padding: 56px 0;
  }

  .section-head h2,
  .page-hero h1 {
    font-size: 26px;
  }

  .grid-3,
  .grid-2,
  .grid-4,
  .stats {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

  .service-item {
    flex-direction: column;
    gap: 16px;
    padding: 24px;
  }
}