/* roulang page: index */
:root {
      --color-primary: #E8380D;
      --color-secondary: #1A1A2E;
      --color-accent: #FFB800;
      --color-bg-dark: #0F0F1A;
      --color-bg-light: #F8F9FC;
      --color-text-light: #FFFFFF;
      --color-text-dark: #1A1A2E;
      --color-text-muted: #6B7280;
      --radius-lg: 20px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.25);
      --shadow-light: 0 2px 16px rgba(0,0,0,0.06);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-data: "DIN Alternate", "Bebas Neue", "Oswald", sans-serif;
      --font-en: "Inter", "Roboto", sans-serif;
      --transition: 0.25s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-sans);
      line-height: 1.6;
      color: var(--color-text-dark);
      background-color: #ffffff;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(15,15,26,0.92);
      backdrop-filter: blur(8px);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: center;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      padding: 0 24px;
    }
    .logo {
      font-family: var(--font-sans);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--color-primary);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: #fff;
      font-weight: 400;
      font-size: 1.2rem;
      margin-left: 4px;
      opacity: 0.9;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      color: #e0e0e0;
      font-weight: 500;
      font-size: 1rem;
      padding-bottom: 6px;
      border-bottom: 3px solid transparent;
      transition: color var(--transition), border-color var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--color-accent);
      border-bottom-color: var(--color-primary);
    }
    .mobile-nav {
      display: none;
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--color-text-dark);
      margin-bottom: 12px;
    }
    .section-title .subtitle {
      color: var(--color-text-muted);
      font-size: 1.1rem;
    }
    .bg-dark {
      background-color: var(--color-bg-dark);
      color: #fff;
    }
    .bg-dark .section-title h2 {
      color: #fff;
    }
    .bg-light {
      background-color: var(--color-bg-light);
    }
    /* 按钮 */
    .btn {
      display: inline-block;
      padding: 16px 36px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 1rem;
      text-align: center;
      transition: all var(--transition);
      cursor: pointer;
      border: none;
    }
    .btn-primary {
      background: linear-gradient(135deg, #E8380D 0%, #FFB800 100%);
      color: #fff;
      box-shadow: 0 8px 20px rgba(232,56,13,0.4);
    }
    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 12px 28px rgba(232,56,13,0.6);
    }
    .btn-outline {
      border: 2px solid var(--color-primary);
      color: #fff;
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--color-primary);
      color: #fff;
    }
    .btn-light {
      background: #fff;
      color: var(--color-primary);
      font-weight: 700;
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1A1A2E 0%, #0F0F1A 60%, #2D1B3D 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 72px;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(232,56,13,0.15) 0%, transparent 70%);
      top: -100px;
      right: -100px;
      border-radius: 50%;
    }
    .hero-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero h1 {
      font-size: 3.5rem;
      font-weight: 700;
      line-height: 1.2;
      color: #fff;
      margin-bottom: 24px;
      letter-spacing: -0.02em;
    }
    .hero .hero-subtitle {
      font-size: 1.3rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 36px;
      max-width: 500px;
    }
    .hero-cta {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-graphic {
      width: 400px;
      height: 400px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      position: relative;
    }
    @media (max-width: 768px) {
      .hero-container {
        flex-direction: column;
        text-align: center;
      }
      .hero-left {
        text-align: center;
      }
      .hero-cta {
        justify-content: center;
      }
      .hero h1 {
        font-size: 2.4rem;
      }
      .hero-graphic {
        width: 280px;
        height: 280px;
      }
    }
    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .pain-card {
      background: rgba(26,26,46,0.85);
      border-radius: var(--radius-lg);
      padding: 32px;
      border-left: 4px solid var(--color-primary);
      color: #fff;
    }
    .pain-icon {
      font-size: 2.2rem;
      margin-bottom: 16px;
    }
    /* 解决方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .solution-card {
      background: #fff;
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-light);
      border-top: 4px solid var(--color-primary);
      transition: all 0.3s;
    }
    .solution-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 8px 40px rgba(232,56,13,0.15);
    }
    /* 数据区 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
      text-align: center;
    }
    .stat-badge {
      background: #1A1A2E;
      border-radius: 50%;
      width: 140px;
      height: 140px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      border: 2px solid var(--color-primary);
      color: #fff;
    }
    .stat-number {
      font-family: var(--font-data);
      font-size: 2.8rem;
      color: var(--color-accent);
      font-weight: 800;
    }
    /* 服务 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .service-card {
      background: #fff;
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-light);
      transition: all 0.25s;
    }
    .service-card:hover {
      border: 1px solid var(--color-primary);
      box-shadow: 0 12px 30px rgba(0,0,0,0.1);
    }
    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      align-items: center;
      text-align: center;
    }
    .step-item {
      flex:1;
    }
    .step-num {
      font-size: 3rem;
      font-weight: 800;
      background: linear-gradient(135deg, #E8380D, #FFB800);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: #F3F4F6;
      border-radius: 16px;
      padding: 28px;
      position: relative;
    }
    .testimonial-card::before {
      content: "“";
      font-size: 3rem;
      color: var(--color-primary);
      position: absolute;
      left: 20px;
      top: 10px;
    }
    /* FAQ */
    .faq-item {
      background: #F8F9FC;
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      padding: 0 20px;
      border-left: 3px solid transparent;
      transition: 0.2s;
    }
    .faq-item.active {
      border-left-color: var(--color-primary);
      background: rgba(232,56,13,0.02);
    }
    .faq-question {
      padding: 18px 0;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s;
    }
    /* 终局CTA */
    .cta-final {
      background: linear-gradient(135deg, #1A1A2E, #E8380D);
      text-align: center;
      padding: 80px 0;
      color: #fff;
    }
    /* 页脚 */
    .footer {
      background: #0F0F1A;
      color: #9CA3AF;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 768px) {
      .pain-grid, .solution-grid, .stats-grid, .service-grid, .testimonial-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .steps {
        flex-direction: column;
        gap: 20px;
      }
      .navbar .nav-links {
        display: none;
      }
      .mobile-nav {
        display: block;
        position: fixed;
        bottom: 20px;
        left: 50%;
        transform: translateX(-50%);
        background: #1A1A2E;
        border-radius: 24px;
        padding: 8px 16px;
        display: flex;
        gap: 20px;
        z-index: 999;
        box-shadow: 0 8px 24px rgba(0,0,0,0.5);
      }
      .mobile-nav a {
        color: #ccc;
        font-size: 0.8rem;
      }
    }