/* roulang page: index */
/* ----- 设计变量与基础重置 ----- */
    :root {
      --primary: #0B3D3A;
      --primary-deep: #051F1D;
      --secondary: #00C9B6;
      --accent: #F4A261;
      --bg-warm: #FAFAF8;
      --bg-light: #F0F4F3;
      --text-main: #1E2B2A;
      --text-soft: #4A5B59;
      --text-light: #8A9B99;
      --white: #FFFFFF;
      --border-light: rgba(11, 61, 58, 0.08);
      --shadow-card: 0 4px 20px rgba(11, 61, 58, 0.06), 0 1px 3px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 20px 30px rgba(11, 61, 58, 0.12), 0 8px 12px rgba(0, 0, 0, 0.06);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-btn: 30px;
      --font-title: '阿里巴巴普惠体', 'HarmonyOS Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'HarmonyOS Sans', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, 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;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: all var(--transition);
      font-weight: 600;
      letter-spacing: 0.5px;
    }
    .btn:focus-visible, a:focus-visible {
      outline: 2px solid var(--secondary);
      outline-offset: 2px;
      border-radius: 4px;
    }
    ul {
      list-style: none;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 1024px) {
      .container {
        padding: 0 24px;
      }
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }

    /* ----- 导航栏 ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid var(--border-light);
      transition: background var(--transition), box-shadow var(--transition);
      height: 80px;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 32px;
    }
    .logo {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 10px;
      letter-spacing: 1px;
    }
    .logo-icon {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      background: var(--primary);
      border-radius: 10px;
      position: relative;
    }
    .logo-icon::before {
      content: "☁️";
      font-size: 20px;
      filter: brightness(0) invert(1);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-soft);
      position: relative;
      padding: 8px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--secondary);
      transition: width var(--transition);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-cta-nav {
      background: var(--secondary);
      color: var(--white);
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(0,201,182,0.3);
    }
    .btn-cta-nav:hover {
      background: #00b3a2;
      box-shadow: 0 8px 18px rgba(0,201,182,0.4);
      transform: translateY(-1px);
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .header-inner {
        padding: 0 20px;
      }
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }
    @media (max-width: 768px) {
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.94);
        backdrop-filter: blur(20px);
        border-top: 1px solid var(--border-light);
        height: 64px;
        z-index: 999;
        justify-content: space-around;
        align-items: center;
        padding: 0 16px;
      }
      .mobile-bottom-nav a {
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 0.7rem;
        color: var(--text-soft);
        gap: 4px;
      }
      .mobile-bottom-nav .menu-expand {
        font-size: 1.6rem;
      }
    }

    /* 移动端全屏菜单 */
    .mobile-menu-panel {
      position: fixed;
      top: 0;
      right: -100%;
      width: 100%;
      height: 100vh;
      background: rgba(11,61,58,0.95);
      backdrop-filter: blur(24px);
      z-index: 2000;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      transition: right 0.4s ease;
      gap: 40px;
    }
    .mobile-menu-panel.active {
      right: 0;
    }
    .mobile-menu-panel a {
      font-size: 2rem;
      font-weight: 600;
      color: white;
    }
    .close-menu {
      position: absolute;
      top: 32px;
      right: 32px;
      font-size: 2.5rem;
      color: white;
      background: none;
      border: none;
    }

    /* ----- 通用区块样式 ----- */
    section {
      padding: 120px 0;
      width: 100%;
    }
    @media (max-width: 1024px) {
      section {
        padding: 80px 0;
      }
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    /* ----- 首屏 Hero ----- */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #F4F9F8 0%, #E8F0EF 100%);
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-content {
      max-width: 600px;
    }
    .hero h1 {
      font-family: var(--font-title);
      font-size: clamp(2.5rem, 6vw, 4.2rem);
      font-weight: 700;
      line-height: 1.15;
      color: var(--primary);
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-soft);
      margin-bottom: 40px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--secondary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 16px 36px;
      font-weight: 700;
      box-shadow: 0 8px 20px rgba(0,201,182,0.35);
    }
    .btn-primary:hover {
      background: #00b3a2;
      transform: translateY(-2px);
      box-shadow: 0 14px 24px rgba(0,201,182,0.45);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 16px 36px;
      font-weight: 700;
    }
    .btn-outline:hover {
      background: rgba(11,61,58,0.05);
    }
    .hero-visual {
      position: relative;
    }
    .shield-animation {
      width: 100%;
      aspect-ratio: 1/1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 30% 70% 50% 50% / 30% 40% 60% 70%;
      box-shadow: 0 30px 50px rgba(11,61,58,0.2);
      animation: morphShield 8s infinite alternate ease-in-out;
      opacity: 0.9;
      mix-blend-mode: multiply;
      background-blend-mode: overlay;
      background-color: rgba(0,201,182,0.1);
    }
    @keyframes morphShield {
      0% { border-radius: 30% 70% 50% 50% / 30% 40% 60% 70%; transform: rotate(0deg); }
      100% { border-radius: 50% 50% 40% 60% / 50% 40% 60% 50%; transform: rotate(2deg); }
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-content {
        order: 2;
      }
      .hero-visual {
        order: 1;
        max-width: 300px;
        margin: 0 auto;
      }
    }

    /* 痛点区 */
    .pain-points {
      background: var(--primary);
      color: white;
    }
    .pain-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .pain-quote {
      font-size: 2rem;
      font-weight: 600;
      line-height: 1.4;
    }
    .pain-cards {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .pain-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      padding: 24px;
      border-radius: var(--radius-md);
      display: flex;
      gap: 20px;
      border-left: 4px solid var(--secondary);
    }
    @media (max-width: 768px) {
      .pain-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 解决方案步骤 */
    .solutions {
      background: var(--bg-light);
    }
    .steps-flex {
      display: flex;
      gap: 30px;
      align-items: flex-end;
      margin-top: 60px;
    }
    .step-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 40px 32px;
      flex: 1;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      position: relative;
      overflow: hidden;
    }
    .step-card.middle {
      transform: translateY(-20px);
      border-top: 4px solid var(--secondary);
      box-shadow: var(--shadow-hover);
    }
    .step-number {
      font-size: 4rem;
      font-weight: 700;
      color: var(--primary);
      opacity: 0.08;
    }
    @media (max-width: 768px) {
      .steps-flex {
        flex-direction: column;
      }
      .step-card.middle {
        transform: none;
      }
    }

    /* 数据仪表盘 */
    .dashboard {
      background: white;
    }
    .dash-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .metric-big {
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--accent);
    }
    .dashboard-img img {
      border-radius: 24px;
      box-shadow: var(--shadow-card);
    }
    @media (max-width: 768px) {
      .dash-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 证言轮播 */
    .testimonials {
      background: linear-gradient(180deg, #F9FCFB 0%, #EEF5F3 100%);
    }
    .carousel {
      display: flex;
      gap: 30px;
      overflow-x: auto;
      padding: 20px 0;
      scroll-snap-type: x mandatory;
    }
    .testimonial-card {
      min-width: 340px;
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      border-left: 4px solid var(--secondary);
      scroll-snap-align: start;
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 80px;
    }
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .accordion-btn {
      width: 100%;
      text-align: left;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }
    @media (max-width: 768px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    /* CTA 终极区 */
    .final-cta {
      background: linear-gradient(135deg, #0B3D3A 0%, #051F1D 100%);
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-blend-mode: overlay;
    }
    .btn-giant {
      padding: 22px 56px;
      font-size: 1.4rem;
      background: var(--secondary);
      color: white;
      border-radius: 60px;
      font-weight: 700;
      position: relative;
      overflow: hidden;
    }
    .btn-giant::after {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
      transition: left 0.6s;
    }
    .btn-giant:hover::after {
      left: 100%;
    }

    /* 页脚 */
    .footer {
      background: #0B2B28;
      color: #BCC9C7;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }