/* roulang page: index */
:root {
      --primary: #FF3366;
      --primary-glow: rgba(255,51,102,0.45);
      --secondary: #00E5FF;
      --secondary-glow: rgba(0,229,255,0.5);
      --dark-surface: #0B0E17;
      --light-surface: #F8F9FC;
      --text-dark: #1A1D26;
      --text-mid: #5A6275;
      --text-light-dim: #B0B8C5;
      --white: #FFFFFF;
      --card-shadow: 0 12px 28px rgba(0,0,0,0.06), 0 4px 16px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 25px 35px rgba(0,0,0,0.1), 0 8px 20px rgba(0,0,0,0.06);
      --border-radius-card: 16px;
      --border-radius-btn: 8px;
      --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', monospace;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background: var(--light-surface);
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    img {
      display: block;
      max-width: 100%;
      height: auto;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 1.5rem;
      }
    }

    /* 导航 - PC沉浸式 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 1.2rem 0;
      background: transparent;
      transition: background 0.3s, box-shadow 0.3s, backdrop-filter 0.3s;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .navbar.scrolled {
      background: rgba(11,14,23,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 8px 20px rgba(0,0,0,0.25);
      padding: 0.8rem 0;
    }
    .nav-logo {
      font-weight: 800;
      font-size: 1.8rem;
      letter-spacing: -0.5px;
      color: white;
      background: linear-gradient(135deg, var(--primary) 0%, #FF8C5A 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-left: 2rem;
    }
    .navbar.scrolled .nav-logo {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
      margin-right: 2rem;
    }
    .nav-links a {
      color: white;
      font-weight: 500;
      font-size: 1rem;
      letter-spacing: 0.3px;
      transition: color 0.2s;
      position: relative;
    }
    .navbar.scrolled .nav-links a {
      color: #E0E5EC;
    }
    .nav-links a:hover {
      color: var(--secondary);
    }
    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 0.6rem 1.5rem;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      box-shadow: 0 0 18px var(--primary-glow);
      transition: all 0.2s;
    }
    .nav-cta:hover {
      background: #ff1a4f;
      box-shadow: 0 0 24px rgba(255,51,102,0.7);
      color: white !important;
    }
    /* 移动端导航切换 */
    .mobile-menu-toggle {
      display: none;
      background: transparent;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
      margin-right: 1rem;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
        color: var(--secondary);
      }
      .navbar {
        padding: 0.8rem 0;
        background: rgba(11,14,23,0.9);
        backdrop-filter: blur(8px);
      }
      .nav-logo {
        font-size: 1.6rem;
        margin-left: 1.2rem;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: #0B0E17;
        backdrop-filter: blur(16px);
        border-top: 1px solid rgba(255,255,255,0.08);
        padding: 0.5rem 1rem;
        justify-content: space-around;
        z-index: 999;
        border-radius: 28px 28px 0 0;
      }
      .mobile-bottom-nav a {
        color: #B0B8C5;
        font-size: 0.75rem;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
        transition: 0.2s;
        font-weight: 500;
      }
      .mobile-bottom-nav a.active {
        color: var(--secondary);
        font-weight: 600;
      }
      .mobile-bottom-nav i {
        font-size: 1.3rem;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      background: linear-gradient(135deg, #0B0E17 0%, #1A1F30 100%);
      position: relative;
      display: flex;
      align-items: center;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.3;
      mix-blend-mode: overlay;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      margin-left: 5%;
    }
    .hero h1 {
      font-size: 4rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      line-height: 1.15;
      color: white;
      margin-bottom: 2rem;
    }
    .hero .highlight {
      background: linear-gradient(to right, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 1.5rem;
      color: #D0D8E7;
      margin-bottom: 2.8rem;
      font-weight: 400;
      border-left: 5px solid var(--primary);
      padding-left: 1.8rem;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 1rem 2.6rem;
      border-radius: var(--border-radius-btn);
      font-weight: 700;
      font-size: 1.2rem;
      display: inline-block;
      box-shadow: 0 0 25px var(--primary-glow);
      transition: all 0.25s;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #ff1a4f;
      box-shadow: 0 0 35px rgba(255,51,102,0.9);
      transform: translateY(-2px);
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2.7rem;
      }
      .hero-content {
        margin-left: 1.5rem;
      }
    }

    section {
      padding: 5rem 0;
    }
    .bg-dark {
      background: var(--dark-surface);
      color: white;
    }
    .section-title {
      font-weight: 800;
      font-size: 2.7rem;
      letter-spacing: -0.5px;
      margin-bottom: 1rem;
    }
    .accent-line {
      width: 70px;
      height: 5px;
      background: var(--primary);
      margin-bottom: 2rem;
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 2rem;
    }
    .pain-card {
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(5px);
      padding: 2.2rem;
      border-radius: var(--border-radius-card);
      border-left: 5px solid var(--primary);
    }
    @media (max-width: 768px) {
      .pain-grid {
        grid-template-columns: 1fr;
      }
    }

    /* Z字型解决方案 */
    .zigzag {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 3rem;
      align-items: center;
      margin-bottom: 4rem;
    }
    .zigzag.reverse {
      grid-template-columns: 0.9fr 1.1fr;
    }
    .zigzag img {
      border-radius: 20px;
      box-shadow: 0 20px 30px rgba(0,0,0,0.5);
    }
    @media (max-width: 768px) {
      .zigzag, .zigzag.reverse {
        grid-template-columns: 1fr;
      }
    }

    /* 数据卡 */
    .stats {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 2rem;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--secondary);
    }

    /* 证言 */
    .testimonial-scroll {
      display: flex;
      gap: 2rem;
      overflow-x: auto;
      padding: 1rem 0;
    }
    .testimonial-card {
      min-width: 300px;
      background: white;
      padding: 2rem;
      border-radius: 24px;
      box-shadow: var(--card-shadow);
    }

    .faq-item {
      background: white;
      border-radius: 16px;
      margin-bottom: 1rem;
      padding: 1.2rem 2rem;
      cursor: pointer;
      transition: 0.2s;
    }
    .cta-section {
      background: var(--dark-surface);
      padding: 4rem 2rem;
      text-align: center;
    }
    footer {
      background: #0B0E17;
      color: #B0B8C5;
      padding: 2rem;
    }