@charset "UTF-8";

:root {
  --primary: #E5E5E5;
  --secondary: #6B7280;
  --dark: #1F2937;
  --light: #F9FAFB;
  --text: #374151;
  --text-light: #9CA3AF;
  --border: #E5E7EB;
  --accent: #4B5563;
  --shadow: rgba(31, 41, 55, 0.12);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Noto Serif SC', 'Songti SC', 'STSong', 'SimSun', serif;
  color: var(--text);
  background: #fff;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--secondary);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  background: var(--dark);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px var(--shadow);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo img {
  height: 44px;
  width: auto;
  flex-shrink: 0;
  display: block;
}

.logo {
  flex-shrink: 0;
  margin-right: 16px;
}

nav {
  flex-wrap: wrap;
  justify-content: flex-end;
}

/* N5 胶囊导航 */
nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

nav a {
  color: var(--primary);
  font-size: 14px;
  padding: 8px 20px;
  border-radius: 24px;
  border: 1px solid rgba(229, 229, 229, 0.2);
  transition: all 0.3s ease;
  white-space: nowrap;
}

nav a:hover,
nav a.active {
  background: var(--primary);
  color: var(--dark);
  border-color: var(--primary);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--primary);
  font-size: 24px;
  cursor: pointer;
}

footer {
  background: var(--dark);
  color: var(--primary);
  padding: 48px 0 24px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-brand .logo-text {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.footer-brand p {
  color: var(--text-light);
  font-size: 14px;
  line-height: 1.6;
}

.footer-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--primary);
}

.footer-links {
  list-style: none;
}

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

.footer-links a {
  color: var(--text-light);
  font-size: 14px;
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-contact p {
  color: var(--text-light);
  font-size: 14px;
  margin-bottom: 8px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
  text-align: center;
  color: var(--text-light);
  font-size: 13px;
}

.footer-bottom a {
  color: var(--text-light);
}

.breadcrumb {
  background: var(--light);
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.breadcrumb-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  font-size: 13px;
  color: var(--text-light);
}

.breadcrumb-inner a {
  color: var(--secondary);
}

.breadcrumb-inner a:hover {
  color: var(--dark);
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
  text-align: center;
}

.section-subtitle {
  font-size: 15px;
  color: var(--text-light);
  text-align: center;
  margin-bottom: 48px;
}

/* C5 图标圆形 */
.icon-circle {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 32px;
  color: var(--secondary);
  border: 2px solid var(--border);
  transition: all 0.3s ease;
}

.icon-circle:hover {
  background: var(--dark);
  color: var(--primary);
  border-color: var(--dark);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--shadow);
}

/* B4 阴影悬浮按钮 */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
  text-align: center;
}

.btn-primary {
  background: var(--dark);
  color: var(--primary);
  box-shadow: 0 4px 12px var(--shadow);
}

.btn-primary:hover {
  box-shadow: 0 8px 24px rgba(31, 41, 55, 0.25);
  transform: translateY(-2px);
  color: var(--primary);
}

.btn-outline {
  background: transparent;
  color: var(--dark);
  border: 2px solid var(--dark);
}

.btn-outline:hover {
  background: var(--dark);
  color: var(--primary);
  transform: translateY(-2px);
}

.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 48px;
  flex-wrap: wrap;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  font-size: 14px;
  color: var(--text);
  transition: all 0.3s ease;
}

.pagination a:hover {
  background: var(--dark);
  color: var(--primary);
  border-color: var(--dark);
}

.pagination .current {
  background: var(--dark);
  color: var(--primary);
  border-color: var(--dark);
}

/* 响应式 */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: block;
  }

  nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--dark);
    flex-direction: column;
    padding: 16px 20px;
    gap: 4px;
  }

  nav.active {
    display: flex;
  }

  nav a {
    width: 100%;
    text-align: center;
  }

  .section-title {
    font-size: 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

@media (max-width: 480px) {
  .container,
  .header-inner,
  .breadcrumb-inner {
    padding: 0 12px;
  }

  nav a {
    padding: 8px 16px;
    font-size: 13px;
  }
}