/* roulang page: index */
:root {
      --primary: #F15A24;
      --primary-hover: #E04A15;
      --secondary: #1C1C1E;
      --surface: #FAFAFA;
      --accent: #00E676;
      --text-main: #2D2D2D;
      --text-light: #6B6B6B;
      --white: #FFFFFF;
      --border-light: #E8E8E8;
      --shadow-card: 0 8px 30px rgba(28,28,30,0.08);
      --shadow-hover: 0 16px 40px rgba(28,28,30,0.15);
      --radius-card: 20px;
      --radius-btn: 50px;
      --radius-input: 50px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', 'Inter', sans-serif;
      --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --max-width: 1280px;
    }

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

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

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    h1, h2, h3 {
      font-weight: 700;
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 900;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 36px;
      line-height: 1.3;
      margin-bottom: 1.5rem;
    }

    h3 {
      font-size: 22px;
      line-height: 1.4;
      font-weight: 600;
    }

    p {
      font-size: 16px;
      color: var(--text-light);
    }

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

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

    button, .btn {
      cursor: pointer;
      border: none;
      background: transparent;
      font-family: inherit;
      font-weight: 600;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      box-shadow: 0 8px 18px rgba(241,90,36,0.25);
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      transform: scale(1.03);
      box-shadow: 0 12px 24px rgba(241,90,36,0.35);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: 2px solid var(--secondary);
      color: var(--secondary);
    }

    .btn-outline:hover {
      background: var(--primary);
      border-color: var(--primary);
      color: white;
      transform: scale(1.03);
    }

    .btn-white {
      background: white;
      color: var(--primary);
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      box-shadow: 0 10px 25px rgba(0,0,0,0.15);
    }

    .btn-white:hover {
      background: var(--surface);
      transform: scale(1.04);
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(28,28,30,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 1000;
      padding: 16px 0;
      transition: background var(--transition);
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
      gap: 24px;
    }

    .logo {
      font-size: 28px;
      font-weight: 800;
      color: white;
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo i {
      color: var(--primary);
      font-size: 32px;
    }

    .search-box {
      flex: 1;
      max-width: 40%;
      position: relative;
      display: flex;
      align-items: center;
    }

    .search-box input {
      width: 100%;
      background: rgba(255,255,255,0.12);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: var(--radius-input);
      padding: 14px 24px 14px 50px;
      color: white;
      font-size: 16px;
      backdrop-filter: blur(4px);
      transition: var(--transition);
    }

    .search-box input::placeholder {
      color: rgba(255,255,255,0.6);
    }

    .search-box input:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(241,90,36,0.3);
      background: rgba(255,255,255,0.18);
    }

    .search-icon {
      position: absolute;
      left: 20px;
      color: rgba(255,255,255,0.6);
      font-size: 18px;
    }

    .nav-links {
      display: flex;
      gap: 24px;
      align-items: center;
    }

    .nav-links a {
      color: white;
      font-weight: 500;
      font-size: 17px;
      transition: color 0.2s;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
    }

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

    .hamburger {
      display: none;
      color: white;
      font-size: 28px;
      cursor: pointer;
    }

    @media (max-width: 1024px) {
      .search-box {
        max-width: 30%;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .search-box {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        max-width: 100%;
        background: var(--secondary);
        padding: 16px 20px;
      }
      .search-box.active {
        display: flex;
      }
      .logo {
        font-size: 24px;
      }
    }

    /* Hero */
    .hero {
      height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, rgba(241,90,36,0.18) 0%, #1C1C1E 85%);
      position: relative;
      overflow: hidden;
    }

    .hero-bg {
      position: absolute;
      right: 0;
      top: 0;
      width: 48%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.3;
      mask-image: linear-gradient(to left, black 30%, transparent);
      -webkit-mask-image: linear-gradient(to left, black 30%, transparent);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 55%;
    }

    .hero h1 {
      color: white;
      margin-bottom: 1.2rem;
    }

    .hero .highlight {
      color: var(--primary);
    }

    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.7);
      margin-bottom: 2.5rem;
      max-width: 500px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .scroll-hint {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      color: white;
      font-size: 24px;
      animation: bounce 2s infinite;
    }

    @keyframes bounce {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(12px); }
    }

    @media (max-width: 768px) {
      .hero {
        text-align: center;
      }
      .hero-content {
        max-width: 100%;
      }
      .hero h1 {
        font-size: 36px;
      }
      .hero-bg {
        width: 100%;
        opacity: 0.15;
      }
      .hero-actions {
        justify-content: center;
      }
    }

    /* 通用板块 */
    section {
      padding: 90px 0;
    }

    .section-header {
      text-align: center;
      margin-bottom: 3.5rem;
    }

    .section-header h2 {
      color: var(--secondary);
    }

    .dark-section {
      background: var(--secondary);
      color: white;
    }

    .dark-section h2, .dark-section p {
      color: white;
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: white;
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border-top: 4px solid transparent;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-top-color: var(--primary);
    }

    .feature-icon {
      font-size: 40px;
      color: var(--accent);
      margin-bottom: 20px;
    }

    .feature-stat {
      font-size: 40px;
      font-weight: 800;
      color: var(--accent);
      margin-top: 16px;
    }

    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
      h2 {
        font-size: 28px;
      }
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .service-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      position: relative;
    }

    .service-img::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(241,90,36,0.25);
      transition: var(--transition);
    }

    .service-card:hover .service-img::after {
      background: transparent;
    }

    .service-body {
      padding: 24px;
    }

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

    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 数据带 */
    .stats-strip {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      text-align: center;
      gap: 30px;
    }

    .stat-item {
      flex: 1;
      min-width: 160px;
    }

    .stat-number {
      font-size: 56px;
      font-weight: 800;
      color: var(--accent);
      line-height: 1;
    }

    .stat-label {
      color: rgba(255,255,255,0.75);
      font-size: 18px;
      margin-top: 8px;
    }

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

    .case-card {
      border-radius: var(--radius-card);
      overflow: hidden;
      height: 380px;
      background-size: cover;
      background-position: center;
      position: relative;
      transition: var(--transition);
    }

    .case-card:hover {
      transform: scale(1.03);
    }

    .case-overlay {
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 30px;
      background: linear-gradient(transparent, rgba(0,0,0,0.8));
      color: white;
    }

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

    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 流程 */
    .process-flow {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      flex-wrap: wrap;
      gap: 20px;
    }

    .process-step {
      flex: 1;
      text-align: center;
      position: relative;
    }

    .step-icon {
      width: 80px;
      height: 80px;
      background: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      color: white;
      font-size: 32px;
    }

    .dotted-arrow {
      display: none;
    }

    @media (min-width: 769px) {
      .process-step:not(:last-child)::after {
        content: '';
        position: absolute;
        top: 40px;
        right: -30px;
        width: 40px;
        height: 2px;
        border-top: 3px dashed var(--accent);
      }
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: #F5F5F5;
      border-radius: 16px;
      margin-bottom: 16px;
      overflow: hidden;
    }

    .faq-question {
      padding: 22px 30px;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
      transition: 0.2s;
    }

    .faq-question span {
      color: var(--accent);
      font-weight: 800;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 30px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 22px;
      border-left: 4px solid var(--primary);
      margin-left: 0;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      text-align: center;
      padding: 100px 20px;
    }

    .cta-section h2 {
      color: white;
      font-size: 42px;
      margin-bottom: 2rem;
    }

    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: #ccc;
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
    }

    .footer-brand p {
      margin-top: 12px;
      font-size: 14px;
      color: #aaa;
    }

    .footer h4 {
      color: white;
      margin-bottom: 16px;
    }

    .footer a {
      color: #aaa;
      display: block;
      margin-bottom: 10px;
      transition: 0.2s;
    }

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

    .copyright {
      border-top: 1px solid #333;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }