/* roulang page: index */
/* ----- 设计令牌 :root 变量 ----- */
    :root {
      --bg-primary: #0D0B1E;
      --bg-card: #1E1930;
      --bg-section-alt: #16122A;
      --primary-orange: #FF5E1A;
      --gold: #F0B90B;
      --text-white: #F2F0F8;
      --text-gray: #D1CFE3;
      --text-muted: #8A86A8;
      --success-green: #00E676;
      --danger-red: #FF1744;
      --border-light: rgba(255,255,255,0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
      --shadow-hover: 0 8px 40px rgba(255,94,26,0.25);
      --font-stack: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', system-ui, -apple-system, sans-serif;
      --container-max: 1280px;
    }

    /* ----- 基础 Reset ----- */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

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

    body {
      font-family: var(--font-stack);
      background-color: var(--bg-primary);
      color: var(--text-gray);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-stack);
      border: none;
      outline: none;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
    }

    ul, ol {
      list-style: none;
    }

    /* ----- 容器与布局 ----- */
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    section {
      padding: 80px 0;
      position: relative;
    }

    @media (max-width: 1024px) {
      section {
        padding: 60px 0;
      }
    }

    /* ----- 导航栏 ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(13, 11, 30, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255, 94, 26, 0.2);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }

    .site-header.scrolled {
      background: rgba(13, 11, 30, 0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.6);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary-orange);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      font-size: 2rem;
      color: var(--gold);
    }

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

    .nav-link {
      color: var(--text-gray);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 8px 0;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary-orange);
      transition: width 0.3s ease;
    }

    .nav-link:hover, .nav-link:focus {
      color: #fff;
    }
    .nav-link:hover::after, .nav-link:focus::after {
      width: 100%;
    }

    .btn-nav {
      background: var(--primary-orange);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-size: 0.9rem;
      margin-left: 16px;
    }
    .btn-nav:hover {
      background: #E04A10;
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--text-white);
      cursor: pointer;
      background: transparent;
      border: none;
    }

    @media (max-width: 1024px) {
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        max-width: 320px;
        height: 100vh;
        background: #0D0B1E;
        flex-direction: column;
        padding: 100px 40px;
        gap: 36px;
        transition: right 0.4s ease;
        box-shadow: -10px 0 30px rgba(0,0,0,0.8);
      }
      .nav-menu.active {
        right: 0;
      }
      .hamburger {
        display: block;
        z-index: 1001;
      }
      .btn-nav {
        margin-left: 0;
        width: fit-content;
      }
    }

    /* ----- 按钮系统 ----- */
    .btn-primary {
      background: var(--primary-orange);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-size: 1rem;
      box-shadow: 0 4px 12px rgba(255,94,26,0.3);
    }
    .btn-primary:hover {
      background: #E04A10;
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(255,94,26,0.5);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--gold);
      color: var(--gold);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
    }
    .btn-outline:hover {
      background: rgba(240,185,11,0.1);
      transform: translateY(-2px);
    }
    .btn-text {
      color: var(--gold);
      font-weight: 600;
      background: transparent;
      padding: 0;
    }
    .btn-text:hover {
      text-decoration: underline;
    }

    /* ----- Hero 首屏 ----- */
    .hero {
      padding: 140px 0 80px;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, rgba(255,94,26,0.08) 0%, var(--bg-primary) 70%);
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-content {
      flex: 1 1 55%;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.02em;
      background: linear-gradient(135deg, #FF5E1A 0%, #F0B90B 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 24px;
    }
    .hero-subtitle {
      font-size: 1.125rem;
      color: var(--text-gray);
      margin-bottom: 36px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .hero-visual {
      flex: 1 1 45%;
      background: url('/assets/images/backpic/back-1.webp') no-repeat center/cover;
      min-height: 360px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      position: relative;
    }

    @media (max-width: 1024px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
      }
      .hero-buttons {
        justify-content: center;
      }
      .hero-visual {
        width: 100%;
      }
    }

    /* ----- 痛点区 ----- */
    .pain-grid {
      display: flex;
      gap: 24px;
      margin-top: 48px;
      flex-wrap: wrap;
    }
    .pain-card {
      flex: 1 1 280px;
      background: var(--bg-section-alt);
      border-left: 4px solid var(--danger-red);
      padding: 32px;
      border-radius: var(--radius-card);
      transition: transform 0.2s;
    }
    .pain-card i {
      color: var(--danger-red);
      font-size: 2rem;
      margin-bottom: 16px;
    }
    
    /* ----- 解决方案步骤 ----- */
    .steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 32px;
      margin-top: 48px;
      position: relative;
    }
    .step-item {
      flex: 1;
      text-align: center;
      position: relative;
    }
    .step-num {
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--primary-orange);
      opacity: 0.8;
    }
    
    /* ----- 优势错位栅格 ----- */
    .adv-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 48px;
    }
    .adv-card {
      background: rgba(30, 25, 48, 0.7);
      backdrop-filter: blur(6px);
      padding: 32px;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      transition: all 0.3s ease;
    }
    .adv-card:hover {
      transform: translateY(-6px);
      border-color: rgba(255,94,26,0.5);
      box-shadow: var(--shadow-hover);
    }
    
    @media (max-width: 768px) {
      .adv-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 520px) {
      .adv-grid {
        grid-template-columns: 1fr;
      }
    }

    /* ----- 数据面板 ----- */
    .stats-panel {
      background: var(--bg-section-alt);
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      text-align: center;
      gap: 32px;
      margin-top: 48px;
    }
    .stat-item h3 {
      font-size: 3.2rem;
      font-weight: 800;
      color: var(--primary-orange);
    }

    /* ----- 证言滑动 ----- */
    .testimonial-scroll {
      display: flex;
      overflow-x: auto;
      gap: 24px;
      padding: 20px 0;
      scrollbar-width: none;
      -ms-overflow-style: none;
    }
    .testimonial-scroll::-webkit-scrollbar {
      display: none;
    }
    .testimonial-card {
      min-width: 300px;
      background: #1E1930;
      border-radius: var(--radius-card);
      padding: 28px;
    }

    /* ----- FAQ 手风琴 ----- */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      cursor: pointer;
      padding: 18px 0;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
    }

    /* ----- 最终CTA ----- */
    .cta-section {
      background: radial-gradient(circle at center, rgba(255,94,26,0.15), var(--bg-primary));
    }
    
    /* ----- 页脚 ----- */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    /* 辅助类 */
    .text-center { text-align: center; }
    .mt-24 { margin-top: 24px; }
    .h2-section { font-size: 2.2rem; font-weight: 700; color: var(--text-white); margin-bottom: 20px; }