/* roulang page: index */
/* 设计变量与基础重置 */
    :root {
      --primary-charcoal: #1A1A1A;
      --accent-orange: #FF4D00;
      --accent-orange-dark: #E04400;
      --secondary-white: #F5F5F0;
      --metal-silver: #C4C4C4;
      --champion-gold: #D4AF37;
      --text-dark: #2D2D2D;
      --text-light: #FFFFFF;
      --card-bg: #FFFFFF;
      --border-light: #E5E5E5;
      --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.06);
      --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.12);
      --radius-sm: 4px;
      --radius-card: 8px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', 'Inter', sans-serif;
      --font-body: 'Noto Serif SC', 'PingFang SC', 'Source Han Serif SC', 'Georgia', serif;
      --font-number: 'DIN Alternate', 'Roboto', 'Inter', sans-serif;
      --max-width: 1280px;
      --header-height: 88px;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--secondary-white);
      color: var(--text-dark);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, .title-font {
      font-family: var(--font-title);
      font-weight: 700;
      letter-spacing: -0.02em;
    }

    .number-font {
      font-family: var(--font-number);
      font-weight: 600;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.2s ease;
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-title);
      font-weight: 600;
      border: none;
      background: none;
      transition: all 0.25s ease;
    }

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

    /* 导航吸顶样式 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(245, 245, 240, 0.85);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--metal-silver);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }

    .header-inner {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 12px 24px;
    }

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

    .logo-text {
      font-family: var(--font-title);
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary-charcoal);
      letter-spacing: -0.5px;
    }
    .logo-text span {
      color: var(--accent-orange);
    }

    .nav-channel {
      display: flex;
      align-items: center;
      gap: 28px;
      font-family: var(--font-title);
      font-weight: 500;
      font-size: 0.95rem;
      letter-spacing: 0.3px;
      color: #2D2D2D;
    }

    .nav-channel a {
      padding: 4px 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }

    .nav-channel a:hover,
    .nav-channel a.active {
      color: var(--accent-orange);
      border-bottom-color: var(--accent-orange);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 18px;
      color: #2D2D2D;
    }

    .icon-btn {
      font-size: 1.3rem;
      background: none;
      border: none;
      color: inherit;
      cursor: pointer;
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      background: none;
      border: none;
      color: var(--primary-charcoal);
    }

    /* 移动端导航 */
    @media (max-width: 1023px) {
      .nav-channel {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 12px;
        padding: 16px 0 8px;
        order: 3;
      }
      .nav-channel.open {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .header-actions .icon-btn:first-child {
        display: none;
      }
    }

    /* Hero 双栏 */
    .hero-section {
      padding-top: var(--header-height);
      display: flex;
      min-height: 85vh;
      background-color: var(--secondary-white);
    }

    .hero-left {
      flex: 0 0 60%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      display: flex;
      align-items: flex-end;
      padding: 60px 48px;
      color: white;
      overflow: hidden;
    }

    .hero-left::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(26,26,26,0.5) 0%, rgba(26,26,26,0.8) 100%);
    }

    /* 斜向速度线 */
    .hero-left::after {
      content: '';
      position: absolute;
      top: -20%;
      left: -10%;
      width: 150%;
      height: 200%;
      background: repeating-linear-gradient(15deg, rgba(255,77,0,0.08) 0px, rgba(255,77,0,0.08) 2px, transparent 2px, transparent 8px);
      pointer-events: none;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 500px;
    }
    .hero-content h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 16px;
      color: white;
    }
    .hero-sub {
      font-size: 1.2rem;
      font-weight: 400;
      opacity: 0.9;
    }

    .hero-right {
      flex: 0 0 40%;
      background: white;
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 48px 40px;
      gap: 32px;
    }

    .stat-item {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .stat-icon {
      font-size: 2.2rem;
      color: var(--champion-gold);
    }
    .stat-number {
      font-size: 2.8rem;
      font-family: var(--font-number);
      color: var(--champion-gold);
      line-height: 1;
    }
    .stat-label {
      font-size: 1rem;
      color: #555;
      margin-top: 4px;
    }

    .btn-primary {
      background: var(--accent-orange);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      display: inline-block;
      text-align: center;
      box-shadow: 0 4px 10px rgba(255,77,0,0.25);
    }
    .btn-primary:hover {
      background: var(--accent-orange-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 16px rgba(255,77,0,0.3);
    }

    @media (max-width: 1023px) {
      .hero-section {
        flex-direction: column;
      }
      .hero-left {
        flex: 0 0 50vh;
        padding: 32px;
      }
      .hero-right {
        flex: auto;
        padding: 32px;
      }
      .hero-content h1 {
        font-size: 2.4rem;
      }
    }

    /* 板块通用 */
    .section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2.4rem;
      margin-bottom: 16px;
      color: var(--primary-charcoal);
    }
    .section-sub {
      color: #666;
      margin-bottom: 48px;
      font-size: 1.1rem;
    }

    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .highlight-item .big-number {
      font-size: 3.2rem;
      color: var(--accent-orange);
      font-family: var(--font-number);
      line-height: 1.2;
    }

    @media (max-width: 1023px) {
      .highlights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .highlights-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 案例瀑布流 */
    .cases-masonry {
      columns: 3;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
      overflow: hidden;
      transition: all 0.3s;
    }
    .case-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }
    .case-img {
      width: 100%;
      height: auto;
      background: #e5e5e5;
      display: block;
    }
    .case-body {
      padding: 20px;
    }
    .case-tag {
      background: var(--accent-orange);
      color: white;
      font-size: 0.75rem;
      padding: 4px 10px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }

    @media (max-width: 1023px) {
      .cases-masonry {
        columns: 2;
      }
    }
    @media (max-width: 640px) {
      .cases-masonry {
        columns: 1;
      }
    }

    /* 方案对比表 */
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .compare-table th {
      background: var(--primary-charcoal);
      color: white;
      padding: 16px;
      font-weight: 600;
    }
    .compare-table td {
      padding: 14px 16px;
      border-bottom: 1px solid #eee;
    }
    .check-icon {
      color: var(--accent-orange);
      font-weight: bold;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 8px;
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 0;
      font-size: 1.1rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      background: #FAFAFA;
      padding: 0 16px;
      border-radius: 4px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 16px;
    }

    /* 联系表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .contact-form {
      padding: 40px;
    }
    .contact-info {
      background: var(--primary-charcoal);
      color: white;
      padding: 40px;
      background-image: linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
      background-size: 20px 20px;
    }
    .input-field {
      width: 100%;
      padding: 12px;
      border: 1px solid var(--metal-silver);
      border-radius: 4px;
      margin-bottom: 16px;
      font-family: inherit;
    }
    .input-field:focus {
      outline: none;
      border-color: var(--accent-orange);
    }
    @media (max-width: 768px) {
      .contact-grid {
        grid-template-columns: 1fr;
      }
    }

    .footer {
      background: var(--primary-charcoal);
      color: #ccc;
      padding: 60px 0 20px;
    }
    .footer a:hover {
      color: var(--accent-orange);
    }