/* roulang page: index */
:root {
      --primary: #7C3AED;
      --primary-glow: #A855F7;
      --accent: #F59E0B;
      --accent-hover: #FBBF24;
      --bg-deep: #0F0F1A;
      --bg-mid: #1A1A2E;
      --card-glass: rgba(255, 255, 255, 0.04);
      --card-border: rgba(255, 255, 255, 0.08);
      --text-primary: #FFFFFF;
      --text-secondary: #B0B0C0;
      --text-muted: #7A7A8A;
      --nav-height-desktop: 72px;
      --nav-height-mobile: 64px;
      --border-radius-lg: 20px;
      --border-radius-md: 12px;
      --border-radius-sm: 8px;
      --border-radius-btn: 10px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-glow: 0 0 20px rgba(168,85,247,0.5);
      --shadow-glow-hover: 0 0 40px rgba(168,85,247,0.8);
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      background: var(--bg-deep);
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', 'SF Pro Display', sans-serif;
      font-weight: 400;
      line-height: 1.7;
      color: var(--text-secondary);
      background: linear-gradient(135deg, var(--bg-deep) 0%, var(--bg-mid) 100%);
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
      width: 100%;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height-desktop);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      z-index: 100;
      background: rgba(15, 15, 26, 0.45);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      transition: background 0.4s ease, box-shadow 0.3s ease;
    }
    .nav.scrolled {
      background: rgba(15, 15, 26, 0.92);
      box-shadow: 0 8px 32px rgba(0,0,0,0.5);
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      letter-spacing: 1px;
      background: linear-gradient(135deg, #C084FC, #F59E0B);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      white-space: nowrap;
      text-decoration: none;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      color: #CCC;
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      position: relative;
      padding: 6px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-glow);
      transition: width 0.25s ease;
      border-radius: 2px;
    }
    .nav-links a:hover {
      color: var(--primary-glow);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-nav {
      background: linear-gradient(135deg, var(--primary), var(--primary-glow));
      border: none;
      padding: 10px 24px;
      border-radius: 20px;
      color: white;
      font-weight: 600;
      font-size: 14px;
      box-shadow: var(--shadow-glow);
      cursor: pointer;
      transition: var(--transition-smooth);
      white-space: nowrap;
      margin-left: 12px;
    }
    .btn-nav:hover {
      box-shadow: var(--shadow-glow-hover);
      transform: scale(1.05);
      background: linear-gradient(135deg, #8B5CF6, #C084FC);
    }
    .mobile-toggle {
      display: none;
      background: transparent;
      border: none;
      color: white;
      font-size: 28px;
      cursor: pointer;
    }
    @media (max-width: 1024px) {
      .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height-desktop);
        left: 0;
        width: 100%;
        background: rgba(10,10,20,0.96);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid rgba(255,255,255,0.1);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
    }

    /* 区块共用 */
    section {
      padding: 80px 0;
      position: relative;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    h2 {
      font-size: 38px;
      font-weight: 600;
      color: var(--text-primary);
      margin-bottom: 20px;
      letter-spacing: 1px;
    }
    @media (max-width: 768px) {
      h2 {
        font-size: 28px;
      }
    }

    /* Hero */
    .hero {
      height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 30% 40%, #1e1a3b 0%, #0f0f1a 80%);
      margin-top: 0;
      padding-top: var(--nav-height-desktop);
    }
    .hero-content {
      position: relative;
      z-index: 5;
      max-width: 700px;
    }
    .hero h1 {
      font-size: 54px;
      font-weight: 700;
      line-height: 1.3;
      color: white;
      margin-bottom: 24px;
      background: linear-gradient(to right, #E9D5FF, #F59E0B);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero .sub {
      font-size: 18px;
      color: #B0B0C0;
      margin-bottom: 36px;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #7C3AED, #A855F7);
      border: none;
      padding: 14px 36px;
      border-radius: var(--border-radius-btn);
      color: white;
      font-weight: 600;
      box-shadow: 0 0 24px rgba(168,85,247,0.6);
      cursor: pointer;
      transition: var(--transition-smooth);
      font-size: 16px;
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 44px rgba(168,85,247,0.9);
      transform: scale(1.06);
      background: linear-gradient(135deg, #8B5CF6, #C084FC);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid rgba(255,255,255,0.35);
      padding: 12px 34px;
      border-radius: var(--border-radius-btn);
      color: white;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition-smooth);
      font-size: 16px;
    }
    .btn-outline:hover {
      border-color: var(--primary-glow);
      background: rgba(168,85,247,0.08);
    }
    .hero-decor {
      position: absolute;
      right: 0;
      bottom: 0;
      width: 45%;
      max-width: 550px;
      opacity: 0.5;
      pointer-events: none;
      background: radial-gradient(circle at 20% 80%, rgba(168,85,247,0.3) 0%, transparent 70%);
      height: 80%;
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 36px;
      }
      .hero {
        text-align: center;
      }
      .hero-content {
        text-align: center;
      }
      .btn-group {
        justify-content: center;
      }
      .hero-decor {
        display: none;
      }
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: 1fr 1.3fr;
      gap: 24px;
      margin-top: 40px;
    }
    .pain-card {
      background: var(--card-glass);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--card-border);
      border-radius: var(--border-radius-lg);
      padding: 28px;
      transition: var(--transition-smooth);
    }
    .pain-card:hover {
      transform: translateY(-4px);
      border-color: rgba(168,85,247,0.4);
      box-shadow: 0 16px 40px rgba(124,58,237,0.2);
    }
    .pain-icon {
      font-size: 28px;
      margin-bottom: 14px;
    }
    @media (max-width: 768px) {
      .pain-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 解决方案 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 40px;
    }
    .solution-card {
      background: var(--card-glass);
      backdrop-filter: blur(16px);
      border: 1px solid var(--card-border);
      border-radius: var(--border-radius-lg);
      overflow: hidden;
      transition: var(--transition-smooth);
      box-shadow: var(--shadow-card);
    }
    .solution-card:hover {
      transform: translateY(-8px);
      border-color: rgba(168,85,247,0.5);
      box-shadow: 0 20px 48px rgba(124,58,237,0.3);
    }
    .card-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .card-img::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, transparent 40%, rgba(15,15,26,0.8));
    }
    .card-content {
      padding: 20px;
    }
    @media (max-width: 1024px) {
      .solutions-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .solutions-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 成果数字 */
    .stats-track {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
      margin-top: 40px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      font-family: 'Inter', sans-serif;
      background: linear-gradient(135deg, #C084FC, #F59E0B);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* 证言 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 20px 0;
      scroll-snap-type: x mandatory;
    }
    .testimonial-card {
      min-width: 300px;
      background: var(--card-glass);
      backdrop-filter: blur(16px);
      border: 1px solid var(--card-border);
      border-radius: var(--border-radius-lg);
      padding: 28px;
      scroll-snap-align: start;
    }

    /* FAQ */
    .faq-item {
      background: rgba(255,255,255,0.03);
      border-left: 3px solid #444;
      border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
      margin-bottom: 16px;
      transition: 0.2s;
    }
    .faq-item.active {
      border-left-color: var(--primary-glow);
      background: rgba(168,85,247,0.06);
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 24px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 18px;
    }

    /* CTA */
    .cta-band {
      background: radial-gradient(circle at 30% 30%, #2e1a4a, #0f0f1a);
      text-align: center;
      border-radius: 32px;
      padding: 70px 24px;
    }

    /* Footer */
    .footer {
      background: #0A0A14;
      padding: 50px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }