/* roulang page: index */
/* ----- 设计系统变量 ----- */
    :root {
      --bg-deep: #0A1128;
      --bg-mid: #1A2342;
      --neon-cyan: #00F0FF;
      --energy-orange: #FF4D00;
      --text-primary: #E8ECF1;
      --text-secondary: #8E9BAE;
      --border-glow: rgba(0, 240, 255, 0.15);
      --glass-bg: rgba(26, 35, 66, 0.6);
      --glass-border: rgba(0, 240, 255, 0.2);
      --card-radius: 12px;
      --btn-radius: 8px;
      --input-radius: 6px;
      --container-max: 1200px;
      --section-padding: 100px;
      --gap-grid: 30px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --shadow-cyan: 0 0 15px rgba(0, 240, 255, 0.6), 0 0 30px rgba(0, 240, 255, 0.3);
      --shadow-orange: 0 0 20px rgba(255, 77, 0, 0.7);
    }

    /* ----- 全局重置与基础 ----- */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      background-color: var(--bg-deep);
    }

    body {
      font-family: var(--font-sans);
      line-height: 1.8;
      color: var(--text-secondary);
      background-color: var(--bg-deep);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease, background 0.2s ease;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: all 0.25s ease;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 区块通用内边距 */
    section {
      padding: var(--section-padding) 0;
    }

    /* 装饰标题下划线 */
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 3px;
      background: var(--neon-cyan);
      margin-top: 12px;
      border-radius: 2px;
      box-shadow: 0 0 8px rgba(0,240,255,0.6);
    }

    /* 玻璃拟态卡片基类 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      box-shadow: inset 0 1px 0 rgba(255,255,255,0.05);
      padding: 28px;
      transition: border 0.2s, background 0.2s;
    }

    /* ----- 导航栏 ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 17, 40, 0.85);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-glow);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: #fff;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      font-size: 2rem;
      filter: drop-shadow(0 0 6px var(--neon-cyan));
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--neon-cyan);
      box-shadow: 0 0 8px var(--neon-cyan);
      transition: width 0.2s;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--neon-cyan);
    }
    .nav-links a:hover::after, .nav-links a.active::after {
      width: 100%;
    }
    .btn-nav-cta {
      background: var(--neon-cyan);
      color: var(--bg-deep);
      font-weight: 700;
      padding: 10px 24px;
      border-radius: var(--btn-radius);
      box-shadow: var(--shadow-cyan);
      letter-spacing: 0.5px;
    }
    .btn-nav-cta:hover {
      box-shadow: 0 0 25px rgba(0,240,255,0.9);
      background: #33f5ff;
    }

    /* 汉堡菜单 (移动端) */
    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      width: 32px;
      height: 32px;
      justify-content: center;
    }
    .menu-toggle span {
      display: block;
      width: 100%;
      height: 3px;
      background: var(--neon-cyan);
      border-radius: 3px;
      transition: 0.3s;
    }

    /* ----- 首屏英雄 ----- */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding-top: 80px;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(0,240,255,0.12) 0%, rgba(10,17,40,0.85) 80%);
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 40px;
      position: relative;
      z-index: 2;
    }
    .hero-content {
      flex: 1;
    }
    .hero h1 {
      font-size: 3.5rem;
      font-weight: 800;
      letter-spacing: 2px;
      color: #FFFFFF;
      text-shadow: 0 0 20px rgba(0,240,255,0.4);
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 40px;
      max-width: 500px;
    }
    .hero-actions {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--neon-cyan);
      color: var(--bg-deep);
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--btn-radius);
      box-shadow: var(--shadow-cyan);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0,240,255,0.9);
      background: #33f5ff;
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid var(--neon-cyan);
      color: var(--neon-cyan);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--btn-radius);
    }
    .btn-ghost:hover {
      background: rgba(0,240,255,0.1);
      box-shadow: 0 0 12px rgba(0,240,255,0.4);
    }
    .hero-visual {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero-visual img {
      max-height: 420px;
      filter: drop-shadow(0 0 24px rgba(0,240,255,0.25));
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: var(--gap-grid);
      margin-top: 40px;
    }
    .pain-card {
      display: flex;
      gap: 20px;
      align-items: flex-start;
    }
    .pain-icon {
      font-size: 2.2rem;
      color: var(--neon-cyan);
    }

    /* 解决方案三列非对称 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--gap-grid);
      margin-top: 40px;
    }
    .solution-card {
      text-align: center;
    }
    .solution-card.featured {
      transform: scale(1.05);
      border-color: var(--neon-cyan);
      box-shadow: 0 0 20px rgba(0,240,255,0.35);
    }
    .solution-img {
      width: 100%;
      height: 160px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 20px;
    }

    /* 数据成果 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
      margin-top: 40px;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--neon-cyan);
      text-shadow: 0 0 12px var(--neon-cyan);
    }

    /* 证言横向滚动 */
    .testimonials-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 10px 0 30px;
      scroll-snap-type: x mandatory;
    }
    .testimonial-card {
      min-width: 300px;
      flex: 0 0 auto;
      scroll-snap-align: start;
    }
    .testimonial-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      border: 2px solid var(--neon-cyan);
      margin-right: 12px;
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-glow);
      margin-bottom: 8px;
    }
    .faq-question {
      background: rgba(26,35,66,0.8);
      padding: 18px 20px;
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      color: #fff;
    }
    .faq-answer {
      padding: 0 20px 20px;
      display: none;
      border-left: 3px solid var(--neon-cyan);
    }
    .faq-item.open .faq-answer {
      display: block;
    }

    /* 终极CTA */
    .cta-section {
      background: radial-gradient(circle at center, rgba(0,240,255,0.08) 0%, var(--bg-deep) 70%);
    }
    .btn-mega {
      background: var(--energy-orange);
      color: #fff;
      font-weight: 800;
      padding: 18px 48px;
      font-size: 1.4rem;
      border-radius: 50px;
      box-shadow: var(--shadow-orange);
    }
    .btn-mega:hover {
      box-shadow: 0 0 35px rgba(255,77,0,1);
      transform: scale(1.05);
    }

    /* 页脚 */
    .footer {
      background: #060B1A;
      padding: 50px 0 24px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero h1 { font-size: 2.8rem; }
      .solution-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: flex; }
      .hero .container { flex-direction: column; }
      .hero h1 { font-size: 2.2rem; }
      .solution-grid, .pain-grid { grid-template-columns: 1fr; }
      .solution-card.featured { transform: none; }
    }