/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --primary: #00E5FF;
      --secondary: #7B2FFF;
      --deep-bg: #0A0E1A;
      --mid-bg: #111827;
      --light-bg: #1E293B;
      --text-main: #F1F5F9;
      --text-muted: #94A3B8;
      --text-subtle: #CBD5E1;
      --danger: #FF3366;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-xs: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.4);
      --shadow-glow: 0 0 20px rgba(0,229,255,0.6);
      --glass-bg: rgba(17, 24, 39, 0.7);
      --glass-border: 1px solid rgba(255, 255, 255, 0.1);
      --glass-blur: blur(12px);
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      background-color: var(--deep-bg);
      color: var(--text-muted);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    /* 数字与英文使用等宽字体 */
    .data-number, .stat-value, .mono {
      font-family: "Inter", "SF Mono", monospace;
    }

    /* 板块通用间距 */
    section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      .container {
        padding: 0 16px;
      }
    }

    /* ----- 文字层级 ----- */
    h2.section-title {
      font-size: clamp(2rem, 4vw, 2.8rem);
      font-weight: 700;
      letter-spacing: -0.01em;
      color: var(--text-main);
      text-align: center;
      margin-bottom: 16px;
    }
    .title-decor {
      width: 70px;
      height: 4px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      margin: 0 auto 48px;
      border-radius: 2px;
    }
    h3 {
      font-size: 1.35rem;
      font-weight: 600;
      color: var(--text-main);
    }

    /* ----- 导航 | 固定磨砂玻璃效果 ----- */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 999;
      background: transparent;
      transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
      padding: 16px 0;
    }
    .navbar.scrolled {
      background: rgba(10, 14, 26, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--text-main);
      text-decoration: none;
      display: flex;
      align-items: center;
    }
    .logo span {
      color: var(--primary);
      font-weight: 900;
      margin-right: 4px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: #F1F5F9;
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      transition: color 0.2s;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--primary);
      border-radius: 2px;
    }
    .hamburger {
      display: none;
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        height: 100vh;
        background: rgba(10,14,26,0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        gap: 40px;
        transition: right 0.3s ease;
        font-size: 1.5rem;
      }
      .nav-links.open {
        right: 0;
      }
      .hamburger {
        display: block;
        font-size: 1.8rem;
        color: white;
        background: transparent;
        border: none;
        z-index: 1000;
      }
    }

    /* ----- 英雄区背景与动态粒子（简洁CSS版）----- */
    .hero-section {
      position: relative;
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: radial-gradient(ellipse at 50% 40%, rgba(123,47,255,0.25) 0%, rgba(10,14,26,1) 75%);
      overflow: hidden;
      padding-top: 70px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 6fr 6fr;
      gap: 40px;
      align-items: center;
      width: 100%;
    }
    .hero-text h1 {
      font-size: clamp(2.8rem, 6vw, 4.2rem);
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.2;
      color: var(--text-main);
      margin-bottom: 20px;
    }
    .hero-text h1 span {
      color: var(--primary);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #94A3B8;
      margin-bottom: 36px;
      max-width: 450px;
    }
    .btn-group {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #00E5FF, #7B2FFF);
      border: none;
      padding: 12px 32px;
      border-radius: 30px;
      color: white;
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      transition: all 0.3s ease;
      box-shadow: 0 4px 15px rgba(0,229,255,0.4);
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary:hover {
      transform: scale(1.05);
      box-shadow: 0 0 24px rgba(0,229,255,0.7);
    }
    .btn-glass {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.25);
      padding: 12px 32px;
      border-radius: 30px;
      color: #F1F5F9;
      font-weight: 500;
      transition: 0.3s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-glass:hover {
      background: rgba(255,255,255,0.12);
      border-color: var(--primary);
    }
    .hero-visual {
      display: flex;
      justify-content: center;
      align-items: center;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 360px;
      border-radius: 24px;
      opacity: 0.9;
      box-shadow: 0 0 50px rgba(123,47,255,0.3);
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-sub {
        margin: 0 auto 30px;
      }
      .btn-group {
        justify-content: center;
      }
      .hero-visual {
        min-height: 250px;
        order: -1;
      }
    }

    /* 卡片通用玻璃风格 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border: var(--glass-border);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      padding: 28px;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .glass-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 12px 35px rgba(0,229,255,0.15);
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat( auto-fit, minmax(280px, 1fr) );
      gap: 24px;
    }
    .pain-item {
      display: flex;
      gap: 20px;
      align-items: flex-start;
    }
    .pain-icon {
      font-size: 2rem;
      color: var(--secondary);
    }

    /* 解决方案卡片发光边框 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .solution-card {
      background: var(--glass-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid rgba(0,229,255,0.15);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      transition: 0.3s;
      position: relative;
      border-top: 3px solid transparent;
      background-clip: padding-box;
    }
    .solution-card::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0;
      height: 3px;
      background: linear-gradient(90deg, var(--primary), var(--secondary));
      border-radius: 16px 16px 0 0;
    }
    .solution-card i {
      font-size: 2.5rem;
      color: var(--primary);
      margin-bottom: 18px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .feature-list {
      list-style: none;
      margin: 16px 0;
    }
    .feature-list li {
      margin-bottom: 10px;
      color: var(--text-subtle);
    }
    .feature-list li::before {
      content: "▸";
      color: var(--primary);
      margin-right: 8px;
    }

    @media (max-width: 1024px) {
      .solution-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 600px) {
      .solution-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 数据统计 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 18px;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
      font-family: "Inter", monospace;
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .avatar {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: radial-gradient(circle at 30% 30%, #7B2FFF, #0A0E1A);
      margin-right: 12px;
      display: inline-block;
    }

    /* FAQ */
    .faq-item {
      background: var(--glass-bg);
      backdrop-filter: var(--glass-blur);
      border: var(--glass-border);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      padding: 18px 24px;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: var(--text-main);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-subtle);
    }

    /* CTA区域 */
    .cta-wrapper {
      background: linear-gradient(180deg, #0A0E1A 0%, #111827 100%);
      text-align: center;
      padding: 80px 20px;
    }

    footer {
      background: #0A0E1A;
      padding: 40px 0;
      border-top: 1px solid rgba(255,255,255,0.05);
    }

    button, .btn-primary, .btn-glass {
      cursor: pointer;
    }