:root {
    --primary: #1a4f8b;
    --primary-light: #2c6cab;
    --primary-dark: #0d3266;
    --accent: #d4a017;
    --accent-light: #e8c040;
    --bg-light: #f7f9fc;
    --text-dark: #1a1a2e;
    --text-gray: #5a6273;
    --white: #ffffff;
    --shadow: 0 4px 24px rgba(26, 79, 139, 0.08);
    --shadow-hover: 0 8px 40px rgba(26, 79, 139, 0.15);
  }
  * { margin: 0; padding: 0; box-sizing: border-box; }
  body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    color: var(--text-dark);
    background: var(--white);
    line-height: 1.7;
  }
  .navbar {
    position: fixed; top: 0; left: 0; width: 100%; height: 76px;
    background: rgba(255, 255, 255, 0.97); backdrop-filter: blur(12px);
    box-shadow: 0 1px 12px rgba(0, 0, 0, 0.06); z-index: 1000;
    display: flex; align-items: center; justify-content: space-between; padding: 0 5%;
  }
  .navbar .logo img { height: 46px; object-fit: contain; }
  .nav-links { display: flex; gap: 36px; list-style: none; }
  .nav-links a {
    text-decoration: none; color: var(--text-dark); font-size: 15px;
    font-weight: 500; transition: color 0.3s; position: relative;
  }
  .nav-links a:hover, .nav-links a.active { color: var(--primary); }
  .nav-links a::after {
    content: ''; position: absolute; bottom: -6px; left: 0; width: 0; height: 2px;
    background: var(--accent); transition: width 0.3s;
  }
  .nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
  .nav-right { display: flex; align-items: center; gap: 20px; }
  .nav-phone { font-size: 18px; font-weight: 700; color: var(--primary); text-decoration: none; white-space: nowrap; display: flex; align-items: center; gap: 6px; }
  .nav-phone i { color: var(--accent); font-size: 16px; }
  .nav-cta {
    background: var(--primary); color: var(--white); padding: 8px 24px;
    border-radius: 6px; font-size: 14px; text-decoration: none; transition: background 0.3s;
  }
  .nav-cta:hover { background: var(--primary-dark); }
  .nav-toggle { display: none; background: none; border: none; font-size: 24px; color: var(--primary); cursor: pointer; padding: 4px 8px; }

  /* 页面头部 Banner */
  .page-header {
    margin-top: 76px; padding: 100px 5% 70px; text-align: center;
    background: var(--primary-dark); position: relative; overflow: hidden;
  }
  .page-header::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background-image:
      radial-gradient(circle at 20% 30%, rgba(212, 160, 23, 0.10) 0%, transparent 50%),
      radial-gradient(circle at 80% 70%, rgba(212, 160, 23, 0.06) 0%, transparent 40%);
    pointer-events: none;
  }
  .page-header-content { position: relative; z-index: 2; max-width: 700px; margin: 0 auto; }
  .page-header .sub-tagline { font-size: 14px; color: var(--accent-light); margin-bottom: 12px; letter-spacing: 6px; }
  .page-header h1 { font-size: 36px; font-weight: 700; color: var(--white); margin-bottom: 16px; letter-spacing: 3px; }
  .page-header p { font-size: 16px; color: rgba(255, 255, 255, 0.8); letter-spacing: 1px; }

  .section { padding: 80px 5%; }
  .section-light { background: var(--white); }
  .section-gray { background: var(--bg-light); }
  .section-dark { background: var(--primary-dark); }
  .section-title { text-align: center; margin-bottom: 12px; }
  .section-title h2 { font-size: 32px; font-weight: 700; color: var(--text-dark); letter-spacing: 3px; }
  .section-dark .section-title h2 { color: var(--white); }
  .section-title .divider { width: 60px; height: 4px; background: var(--accent); margin: 16px auto 24px; border-radius: 2px; }
  .section-subtitle { text-align: center; font-size: 15px; color: var(--text-gray); margin-bottom: 50px; max-width: 700px; margin-left: auto; margin-right: auto; }
  .section-dark .section-subtitle { color: rgba(255, 255, 255, 0.7); }

  /* 关于润网 */
  .about-wrap { max-width: 900px; margin: 0 auto; }
  .about-block { margin-bottom: 40px; }
  .about-block h3 { font-size: 20px; color: var(--primary); margin-bottom: 14px; font-weight: 700; display: flex; align-items: center; gap: 10px; }
  .about-block h3 i { color: var(--accent); }
  .about-block p { font-size: 16px; color: var(--text-gray); line-height: 2; text-indent: 2em; }
  .about-block .highlight { color: var(--primary); font-weight: 600; }

  /* 发展历程时间轴 */
  .timeline { max-width: 900px; margin: 0 auto; position: relative; }
  .timeline::before { content: ''; position: absolute; left: 20px; top: 0; bottom: 0; width: 3px; background: linear-gradient(to bottom, var(--primary), var(--accent)); border-radius: 2px; }
  .timeline-item { position: relative; padding-left: 60px; margin-bottom: 36px; }
  .timeline-item::before { content: ''; position: absolute; left: 13px; top: 6px; width: 17px; height: 17px; border-radius: 50%; background: var(--white); border: 3px solid var(--primary); z-index: 2; }
  .timeline-item .tl-stage { display: inline-block; font-size: 14px; color: var(--accent); font-weight: 700; margin-bottom: 8px; padding: 3px 14px; background: rgba(212, 160, 23, 0.12); border-radius: 20px; }
  .timeline-item h4 { font-size: 17px; color: var(--text-dark); margin-bottom: 8px; font-weight: 700; }
  .timeline-item p { font-size: 15px; color: var(--text-gray); line-height: 1.8; }

  /* 战略方向 */
  .strategy-intro { max-width: 900px; margin: 0 auto 40px; }
  .strategy-intro p { font-size: 16px; color: var(--text-gray); line-height: 2; text-indent: 2em; }
  .strategy-grid { max-width: 1100px; margin: 0 auto; display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .strategy-card { background: var(--white); border-radius: 12px; padding: 32px 28px; box-shadow: var(--shadow); transition: all 0.3s; border-top: 4px solid var(--primary); }
  .strategy-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-top-color: var(--accent); }
  .strategy-card .strat-icon { width: 56px; height: 56px; border-radius: 12px; background: linear-gradient(135deg, var(--primary), var(--primary-light)); display: flex; align-items: center; justify-content: center; font-size: 24px; color: var(--white); margin-bottom: 20px; }
  .strategy-card h4 { font-size: 17px; font-weight: 700; margin-bottom: 10px; color: var(--text-dark); }
  .strategy-card p { font-size: 14px; color: var(--text-gray); line-height: 1.7; }
  .strategy-conclusion { max-width: 900px; margin: 40px auto 0; text-align: center; }
  .strategy-conclusion p { font-size: 16px; color: var(--primary); font-weight: 600; line-height: 1.8; }

  /* 资质 */
  .qual-wrap { max-width: 800px; margin: 0 auto; }
  .qual-card { display: flex; align-items: flex-start; gap: 20px; background: var(--white); border-radius: 12px; padding: 28px 32px; margin-bottom: 20px; box-shadow: var(--shadow); transition: all 0.3s; border-left: 4px solid var(--accent); }
  .qual-card:hover { box-shadow: var(--shadow-hover); }
  .qual-card .qual-icon { width: 48px; height: 48px; border-radius: 50%; background: rgba(26, 79, 139, 0.1); display: flex; align-items: center; justify-content: center; font-size: 20px; color: var(--primary); flex-shrink: 0; }
  .qual-card .qual-text h4 { font-size: 16px; font-weight: 700; color: var(--text-dark); margin-bottom: 6px; }
  .qual-card .qual-text p { font-size: 14px; color: var(--text-gray); }
  .qual-extra { max-width: 800px; margin: 0 auto; text-align: center; }
  .qual-extra p { font-size: 15px; color: var(--text-gray); line-height: 1.8; }

  /* 企业文化 */
  .culture-grid { max-width: 1000px; margin: 0 auto; display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .culture-card { background: rgba(255, 255, 255, 0.06); border-radius: 12px; padding: 36px 30px; border-top: 3px solid var(--accent); transition: all 0.3s; }
  .culture-card:hover { background: rgba(212, 160, 23, 0.12); }
  .culture-card .cul-label { font-size: 13px; color: var(--accent); font-weight: 700; margin-bottom: 10px; letter-spacing: 2px; }
  .culture-card h4 { font-size: 17px; color: var(--white); margin-bottom: 12px; font-weight: 700; }
  .culture-card p { font-size: 14px; color: rgba(255, 255, 255, 0.75); line-height: 1.8; }

  /* 行业口碑 */
  .reputation-wrap { max-width: 1000px; margin: 0 auto; }
  .reputation-card { background: var(--white); border-radius: 12px; padding: 36px 32px; margin-bottom: 24px; box-shadow: var(--shadow); border-left: 4px solid var(--primary); transition: all 0.3s; }
  .reputation-card:hover { box-shadow: var(--shadow-hover); border-left-color: var(--accent); }
  .reputation-card h4 { font-size: 18px; font-weight: 700; color: var(--primary); margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
  .reputation-card h4 i { color: var(--accent); }
  .reputation-card p { font-size: 15px; color: var(--text-gray); line-height: 1.8; }
  .reputation-card .placeholder { margin-top: 12px; padding: 14px 18px; background: var(--bg-light); border-radius: 8px; font-size: 13px; color: #98a4b0; border: 1px dashed #d0d8e0; }

  /* 联系我们 - 左右分栏 */
  .contact-wrap { max-width: 900px; margin: 0 auto; }
    #contact { padding-top: 52px; padding-bottom: 52px; }
  .contact-layout { display: grid; grid-template-columns: 1.5fr 1fr; gap: 50px; align-items: center; }
  .contact-info h2 { font-size: 28px; color: var(--white); margin-bottom: 12px; letter-spacing: 3px; }
  .contact-info > p { color: rgba(255, 255, 255, 0.7); margin-bottom: 32px; font-size: 15px; }
  .contact-list { display: flex; flex-direction: column; gap: 18px; }
  .contact-row { display: flex; align-items: flex-start; gap: 14px; }
  .contact-row i { font-size: 18px; color: var(--accent); margin-top: 2px; flex-shrink: 0; }
  .contact-row .c-detail { flex: 1; }
  .contact-row .label { font-size: 12px; color: rgba(255, 255, 255, 0.5); margin-bottom: 3px; }
  .contact-row .value { font-size: 16px; color: var(--white); font-weight: 500; line-height: 1.5; }
  .contact-qr { text-align: center; }
  .contact-qr .qr-frame { display: inline-block; padding: 12px; background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.15); border-radius: 16px; }
  .contact-qr .qr-frame img { width: 160px; height: 160px; border-radius: 8px; display: block; }
  .contact-qr .qr-label { margin-top: 14px; font-size: 14px; color: var(--white); font-weight: 600; }
  .contact-qr .qr-sub { margin-top: 4px; font-size: 12px; color: rgba(255, 255, 255, 0.5); }
  footer { background: var(--primary-dark); padding: 30px 5%; text-align: center; }
  footer p { color: rgba(255, 255, 255, 0.5); font-size: 13px; }
  footer a { color: inherit; }

  /* 平板 */
  @media (max-width: 900px) {
    .nav-links { display: none; }
    .nav-toggle { display: block; }
    .strategy-grid, .culture-grid, .contact-items { grid-template-columns: 1fr; }
    .contact-layout { grid-template-columns: 1fr; gap: 36px; text-align: center; }
    .contact-list { align-items: center; }
    .page-header h1 { font-size: 28px; }
    .section { padding: 60px 4%; }
    .section-title h2 { font-size: 26px; }
  }
  /* 手机 */
  @media (max-width: 600px) {
    .navbar { height: 60px; padding: 0 3%; }
    .navbar .logo img { height: 34px; }
    .nav-phone { font-size: 14px; }
    .nav-phone i { font-size: 12px; }
    .nav-cta { padding: 6px 16px; font-size: 12px; }
    .page-header { margin-top: 60px; padding: 60px 5% 50px; }
    .page-header h1 { font-size: 22px; letter-spacing: 2px; }
    .page-header p { font-size: 14px; }
    .section { padding: 48px 5%; }
    .section-title h2 { font-size: 22px; letter-spacing: 2px; }
    .section-subtitle { font-size: 13px; margin-bottom: 36px; }
    .about-block h3 { font-size: 18px; }
    .about-block p { font-size: 14px; }
    .timeline-item { padding-left: 50px; }
    .timeline-item h4 { font-size: 16px; }
    .timeline-item p { font-size: 14px; }
    .strategy-card, .culture-card, .reputation-card { padding: 24px 20px; }
    .strategy-card h4, .culture-card h4 { font-size: 16px; }
    .strategy-card p, .culture-card p, .reputation-card p { font-size: 13px; }
    .contact-layout { gap: 30px; text-align: center; }
    .contact-list { align-items: center; }
    .contact-row { flex-direction: column; gap: 4px; align-items: center; }
    .contact-row .value { font-size: 14px; }
    footer p { font-size: 12px; }
  }
  /* 手机导航展开 */
  .nav-links.mobile-open {
    display: flex !important;
    position: absolute; top: 60px; left: 0; right: 0;
    flex-direction: column; gap: 0; background: rgba(255,255,255,0.98);
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
    padding: 0; margin: 0;
  }
  .nav-links.mobile-open li { padding: 14px 5%; border-bottom: 1px solid #eef0f4; }
  .nav-links.mobile-open a { font-size: 15px; }

  /* 免费咨询二维码弹窗 */
  .qr-modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.5); z-index: 9999;
    display: none; align-items: center; justify-content: center;
    backdrop-filter: blur(4px);
  }
  .qr-modal-overlay.show { display: flex; }
  .qr-modal {
    background: #fff; border-radius: 20px; padding: 40px 36px 32px;
    max-width: 320px; width: 88%; text-align: center; position: relative;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: modalIn 0.3s ease;
  }
  @keyframes modalIn {
    from { opacity: 0; transform: scale(0.9) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
  }
  .qr-modal-close {
    position: absolute; top: 16px; right: 16px;
    width: 32px; height: 32px; border-radius: 50%;
    background: #f0f0f0; border: none; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    font-size: 16px; color: #999; transition: all 0.3s;
  }
  .qr-modal-close:hover { background: #e0e0e0; color: #666; }
  .qr-modal h3 { font-size: 22px; font-weight: 700; color: #0d3266; margin-bottom: 8px; }
  .qr-modal .qr-modal-sub { font-size: 13px; color: #999; margin-bottom: 24px; }
  .qr-modal-img { width: 200px; height: 200px; margin: 0 auto 20px; border-radius: 12px; border: 1px solid #eef0f4; }
  .qr-modal-tip { font-size: 14px; color: #666; margin-bottom: 4px; }
  .qr-modal-tip span { color: #1a4f8b; font-weight: 600; }
  .qr-modal-desc { font-size: 12px; color: #aaa; }