/* roulang page: index */
/* ----- 全局变量与重置 ----- */
    :root {
      --primary: #1A5F7A;
      --primary-light: rgba(26, 95, 122, 0.08);
      --secondary: #2D9CDB;
      --accent: #F2994A;
      --accent-hover: #E0882A;
      --bg: #F8FAFB;
      --card-bg: #FFFFFF;
      --dark-bg: #0D2B3E;
      --text: #2D3748;
      --text-muted: #718096;
      --border-light: #E2E8F0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 4px 8px rgba(0,0,0,0.06), 0 12px 24px rgba(0,0,0,0.08);
      --radius-sm: 8px;
      --radius: 12px;
      --radius-lg: 16px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-number: 'Inter', 'SF Pro Display', sans-serif;
      --max-width: 1200px;
      --nav-height: 72px;
    }

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

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 2rem;
    }

    /* ----- 导航栏 ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      z-index: 1000;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: background 0.3s, border-color 0.3s, box-shadow 0.3s;
    }

    .site-header.scrolled {
      background: rgba(255,255,255,0.98);
      border-bottom-color: rgba(0,0,0,0.05);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 2rem;
    }

    .logo {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 0.25rem;
    }

    .logo-mark {
      width: 6px;
      height: 6px;
      background: var(--accent);
      border-radius: 2px;
      margin-right: 0.25rem;
      display: inline-block;
    }

    .nav-links {
      display: flex;
      gap: 2.5rem;
      list-style: none;
      font-weight: 500;
      color: #4A5568;
    }

    .nav-links a {
      position: relative;
      padding-bottom: 0.25rem;
      font-size: 0.95rem;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }

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

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-primary-sm {
      background: var(--accent);
      color: white;
      border-radius: var(--radius-sm);
      padding: 0.6rem 1.4rem;
      font-weight: 600;
      font-size: 0.9rem;
      white-space: nowrap;
    }

    .btn-primary-sm:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
      box-shadow: 0 4px 10px rgba(242, 153, 74, 0.3);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      transition: 0.3s;
    }

    .mobile-menu {
      position: fixed;
      top: var(--nav-height);
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(20px);
      padding: 2rem;
      display: none;
      flex-direction: column;
      gap: 2rem;
      list-style: none;
      font-size: 1.2rem;
      font-weight: 500;
      box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      z-index: 999;
    }
    .mobile-menu.active {
      display: flex;
    }

    /* ----- 通用板块 ----- */
    section {
      padding: 6rem 0;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 600;
      color: var(--text);
      margin-bottom: 1rem;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 48px;
      height: 3px;
      background: var(--secondary);
      border-radius: 2px;
    }

    .section-subtitle {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }

    /* ----- Hero ----- */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: var(--bg);
      position: relative;
      overflow: hidden;
      padding-top: var(--nav-height);
    }

    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 3rem;
      width: 100%;
    }

    .hero-text {
      flex: 1;
      z-index: 2;
    }

    .hero-text h1 {
      font-size: clamp(2.8rem, 5vw, 4.2rem);
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary);
      margin-bottom: 1.5rem;
    }

    .hero-text p {
      font-size: 1.25rem;
      color: var(--text-muted);
      margin-bottom: 2.5rem;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      border-radius: var(--radius-sm);
      padding: 0.9rem 2.2rem;
      font-weight: 600;
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(242, 153, 74, 0.35);
    }

    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-sm);
      padding: 0.9rem 2.2rem;
      font-weight: 600;
      font-size: 1rem;
    }
    .btn-outline:hover {
      background: var(--primary-light);
    }

    .hero-visual {
      flex: 1;
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 400px;
    }

    .geo-shapes {
      width: 450px;
      height: 450px;
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 50%;
      box-shadow: 0 25px 50px rgba(26,95,122,0.15);
      opacity: 0.95;
    }
    .geo-shapes::after {
      content: '';
      position: absolute;
      inset: -20px;
      border-radius: 50%;
      background: radial-gradient(circle at 30% 30%, rgba(45,156,219,0.2), transparent 70%);
    }

    /* ----- 痛点与方案 ----- */
    .pain-solution-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: start;
    }

    .pain-list {
      display: flex;
      flex-direction: column;
      gap: 2rem;
    }

    .pain-item {
      display: flex;
      gap: 1rem;
      align-items: flex-start;
    }

    .pain-icon {
      width: 40px;
      height: 40px;
      background: #FED7D7;
      color: #C53030;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.3rem;
      flex-shrink: 0;
    }

    .solution-cards {
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
    }

    .solution-card {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 1.8rem;
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--primary);
      transition: all 0.25s;
    }
    .solution-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }

    /* ----- 核心优势(大数字) ----- */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .stat-card {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 2.5rem 2rem;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: 0.25s;
    }
    .stat-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 3.8rem;
      font-weight: 800;
      color: var(--secondary);
      line-height: 1;
      margin-bottom: 0.75rem;
    }

    .stat-title {
      font-weight: 600;
      font-size: 1.3rem;
      margin-bottom: 1rem;
    }

    .stat-divider {
      width: 40px;
      height: 2px;
      background: rgba(26,95,122,0.3);
      margin: 0 auto 1.2rem;
    }

    /* ----- 案例网格 ----- */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 2rem;
    }

    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius);
      padding: 1.8rem;
      box-shadow: var(--shadow-sm);
      transition: 0.25s;
    }
    .case-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .case-tag {
      background: rgba(45,156,219,0.15);
      color: var(--secondary);
      font-weight: 600;
      font-size: 0.8rem;
      padding: 0.2rem 1rem;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 1rem;
    }

    .case-logo-placeholder {
      width: 60px;
      height: 60px;
      background: #E2E8F0;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #A0AEC0;
      font-weight: 600;
      font-size: 0.7rem;
      margin-top: 1rem;
    }

    /* ----- 证言 ----- */
    .testimonial-block {
      background: #EDF2F7;
      border-radius: var(--radius-lg);
      padding: 4rem 3rem;
      position: relative;
    }

    .testimonial-quote {
      font-size: 1.4rem;
      line-height: 1.8;
      font-style: italic;
      margin-bottom: 2rem;
      position: relative;
    }
    .testimonial-quote::before {
      content: "“";
      font-size: 7rem;
      color: var(--primary);
      opacity: 0.1;
      position: absolute;
      left: -2rem;
      top: -3rem;
      font-family: serif;
    }

    .client-info {
      display: flex;
      align-items: center;
      gap: 1rem;
    }

    .client-avatar {
      width: 48px;
      height: 48px;
      background: #CBD5E0;
      border-radius: 50%;
      position: relative;
      overflow: hidden;
    }
    .client-avatar::after {
      content: "";
      position: absolute;
      bottom: -6px;
      left: 50%;
      transform: translateX(-50%);
      width: 22px;
      height: 22px;
      background: #A0AEC0;
      border-radius: 50%;
    }

    /* ----- FAQ ----- */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 2fr;
      gap: 3rem;
    }

    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
    }

    .accordion-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text);
    }

    .accordion-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
      margin-top: 0.5rem;
    }
    .accordion-item.active .accordion-answer {
      max-height: 200px;
    }

    /* ----- CTA ----- */
    .cta-section {
      background: var(--dark-bg);
      color: white;
      text-align: center;
      padding: 5rem 2rem;
    }

    .cta-buttons {
      display: flex;
      gap: 1.5rem;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 2rem;
    }

    .btn-white-outline {
      border: 2px solid white;
      color: white;
      border-radius: var(--radius-sm);
      padding: 0.9rem 2.2rem;
      font-weight: 600;
    }

    /* ----- 页脚 ----- */
    .site-footer {
      background: var(--dark-bg);
      color: #CBD5E0;
      padding: 4rem 0 2rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2.5rem;
    }

    .footer-logo {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 1.6rem;
      color: white;
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 2.5rem;
      padding-top: 2rem;
      text-align: center;
      font-size: 0.9rem;
    }

    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .pain-solution-grid, .faq-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 640px) {
      .hero-content { flex-direction: column; }
      .geo-shapes { width: 280px; height: 280px; }
      .case-grid, .stats-grid, .footer-grid { grid-template-columns: 1fr; }
      section { padding: 4rem 0; }
    }