/* roulang page: index */
:root {
      --primary-deep: #0B1A2F;
      --accent-orange: #FF6B3D;
      --accent-light: #FF8C5A;
      --white: #FFFFFF;
      --gray-bg: #F8F9FA;
      --text-body: #4A5568;
      --text-heading: #0B1A2F;
      --border-light: #E2E8F0;
      --shadow-card: 0 4px 20px rgba(11, 26, 47, 0.06);
      --shadow-hover: 0 12px 32px rgba(11, 26, 47, 0.1);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --transition: 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "SF Pro Display", sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--gray-bg);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3 {
      color: var(--text-heading);
      font-weight: 600;
      line-height: 1.3;
    }

    h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    h2 {
      font-size: 36px;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 20px;
      font-weight: 600;
    }

    p {
      margin-bottom: 1.5em;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    img {
      max-width: 100%;
      display: block;
      height: auto;
      border-radius: var(--radius-card);
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
      font-weight: 500;
      transition: var(--transition);
    }

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      padding: 16px 0;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      background: transparent;
    }

    .header.scrolled {
      background: rgba(11, 26, 47, 0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: white;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo i {
      font-size: 2rem;
      color: var(--accent-orange);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: rgba(255,255,255,0.9);
      font-weight: 500;
      font-size: 1rem;
      transition: color 0.2s;
      position: relative;
    }

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

    .nav-cta {
      background: var(--accent-orange);
      color: white !important;
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 600;
      transition: background 0.2s, transform 0.2s;
    }

    .nav-cta:hover {
      background: var(--accent-light);
      transform: translateY(-1px);
    }

    .mega-trigger {
      position: relative;
    }

    .mega-panel {
      position: absolute;
      top: 40px;
      right: 0;
      width: 600px;
      background: white;
      border-radius: 12px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.15);
      padding: 24px;
      display: none;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      opacity: 0;
      transform: translateY(10px);
      transition: 0.2s;
      pointer-events: none;
      z-index: 200;
    }

    .mega-trigger:hover .mega-panel {
      display: grid;
      opacity: 1;
      transform: translateY(0);
      pointer-events: auto;
    }

    .mega-service-card {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 10px;
      border-radius: 8px;
      transition: background 0.2s;
    }

    .mega-service-card:hover {
      background: #f5f5f5;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }

    .hamburger span {
      width: 25px;
      height: 3px;
      background: white;
      transition: 0.3s;
    }

    /* 板块间距 */
    section {
      padding: 100px 0;
    }

    /* Hero */
    .hero {
      background: var(--gray-bg);
      background-image: radial-gradient(circle at 30% 40%, rgba(255,107,61,0.03) 0%, transparent 50%);
      padding-top: 140px;
      display: flex;
      align-items: center;
      min-height: 90vh;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-content {
      flex: 1;
    }

    .hero-image {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      min-height: 420px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    }

    .btn-group {
      display: flex;
      gap: 16px;
      margin-top: 32px;
    }

    .btn-primary {
      background: linear-gradient(135deg, #FF6B3D 0%, #FF8C5A 100%);
      color: white;
      padding: 14px 36px;
      border-radius: 30px;
      font-weight: 600;
      box-shadow: 0 8px 20px rgba(255,107,61,0.3);
    }

    .btn-primary:hover {
      filter: brightness(1.1);
      transform: translateY(-2px);
    }

    .btn-ghost {
      border: 2px solid var(--accent-orange);
      color: var(--accent-orange);
      background: transparent;
      padding: 14px 36px;
      border-radius: 30px;
      font-weight: 600;
    }

    .btn-ghost:hover {
      background: var(--accent-orange);
      color: white;
    }

    /* 卡片通用 */
    .card {
      background: white;
      border-radius: 12px;
      padding: 32px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
      transition: var(--transition);
    }

    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-color: rgba(255,107,61,0.3);
    }

    /* 痛点样式 */
    .pain-card {
      background: #f2f4f8;
      border: 1px dashed #cbd5e0;
      box-shadow: none;
    }

    .solution-layout {
      display: flex;
      gap: 60px;
      align-items: center;
      margin-top: 40px;
    }

    .solution-text {
      flex: 1;
    }

    .solution-img {
      flex: 1;
    }

    /* 数据模块 */
    .stats-bg {
      background: var(--primary-deep);
      color: white;
      border-radius: 24px;
      padding: 60px 40px;
      display: flex;
      justify-content: space-around;
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-orange);
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .testimonial-card {
      background: white;
      padding: 28px;
      border-radius: 12px;
      box-shadow: var(--shadow-card);
    }

    .quote-line {
      border-left: 4px solid var(--accent-orange);
      padding-left: 20px;
      font-style: italic;
      margin: 16px 0;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 10px;
      margin-bottom: 12px;
      overflow: hidden;
      border: 1px solid var(--border-light);
    }

    .faq-question {
      background: #f8f9fa;
      padding: 18px 28px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .faq-answer {
      padding: 0 28px 18px;
      display: none;
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-dark {
      background: var(--primary-deep);
      text-align: center;
      padding: 80px 20px;
      border-radius: 24px;
      color: white;
    }

    .footer {
      background: var(--primary-deep);
      color: #a0aec0;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      .hero-grid { flex-direction: column; }
      .solution-layout { flex-direction: column; }
      .testimonial-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      section { padding: 60px 0; }
      .stats-bg { flex-direction: column; gap: 30px; }
      .footer-grid { grid-template-columns: 1fr; }
    }