/* roulang page: index */
:root {
      --primary: #A855F7;
      --primary-dark: #7C3AED;
      --accent: #F59E0B;
      --bg-deep: #0B0E14;
      --bg-card: #131824;
      --bg-elevated: #1A1F2E;
      --text-white: #FFFFFF;
      --text-body: #B0C4DE;
      --text-link: #A5B4FC;
      --success: #10B981;
      --danger: #EF4444;
      --border-light: rgba(255,255,255,0.08);
      --border-glow: rgba(168,85,247,0.4);
      --shadow-glow: 0 8px 32px rgba(168,85,247,0.15);
      --radius-lg: 16px;
      --radius-md: 12px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "Inter", "SF Mono", monospace;
      --transition: 0.3s ease;
      --max-width: 1200px;
      --nav-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      background-color: var(--bg-deep);
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.6;
      -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;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(11, 14, 20, 0.75);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      transition: background 0.3s, border-color 0.3s;
      height: var(--nav-height);
      display: flex;
      align-items: center;
    }
    .nav.scrolled {
      background: rgba(8, 10, 15, 0.9);
      border-bottom-color: rgba(255,255,255,0.12);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-white);
      letter-spacing: -0.3px;
      white-space: nowrap;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 18px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      font-weight: 500;
      color: var(--text-body);
    }
    .nav-links a {
      position: relative;
      padding: 8px 0;
      font-size: 0.95rem;
      transition: color 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      text-shadow: 0 0 8px rgba(168,85,247,0.6);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      box-shadow: 0 0 12px var(--primary);
      border-radius: 2px;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }
    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: 0;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: rgba(8, 10, 15, 0.96);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 100px 32px 40px;
        gap: 28px;
        transform: translateX(100%);
        transition: transform 0.3s ease;
        box-shadow: -8px 0 30px rgba(0,0,0,0.5);
        border-left: 1px solid rgba(255,255,255,0.05);
      }
      .nav-links.open {
        transform: translateX(0);
      }
      .menu-toggle {
        display: block;
        z-index: 1100;
      }
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
      position: relative;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .section-sub {
      color: var(--text-body);
      font-size: 1.1rem;
      margin-bottom: 48px;
    }
    /* 按钮 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 1rem;
      transition: all 0.2s ease;
      cursor: pointer;
      border: none;
      text-align: center;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: white;
      box-shadow: 0 0 20px rgba(168,85,247,0.5);
    }
    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(168,85,247,0.8);
      transform: translateY(-2px);
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.2);
      color: white;
    }
    .btn-ghost:hover {
      border-color: var(--primary);
      background: rgba(168,85,247,0.08);
      transform: translateY(-2px);
    }
    .btn-large {
      padding: 18px 42px;
      font-size: 1.2rem;
      border-radius: 40px;
    }
    /* 卡片玻璃效果 */
    .glass-card {
      background: rgba(19, 24, 36, 0.65);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: var(--radius-lg);
      box-shadow: inset 0 1px 0 rgba(255,255,255,0.05);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      border-color: var(--border-glow);
      box-shadow: var(--shadow-glow);
      transform: translateY(-4px);
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, #1a1030 0%, #0B0E14 75%);
      position: relative;
      overflow: hidden;
      padding-top: var(--nav-height);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }
    .hero-content {
      flex: 1 1 400px;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 20px;
    }
    .hero .highlight {
      color: var(--primary);
    }
    .hero p {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-mockup {
      flex: 1 1 350px;
      position: relative;
      display: flex;
      justify-content: center;
    }
    .mockup-frame {
      width: 280px;
      background: rgba(20,25,36,0.7);
      backdrop-filter: blur(20px);
      border-radius: 36px;
      padding: 18px;
      border: 1px solid rgba(255,255,255,0.15);
      box-shadow: 0 30px 50px rgba(0,0,0,0.6);
    }
    .mockup-screen {
      background: #0f1322;
      border-radius: 24px;
      padding: 20px;
      color: white;
    }
    .floating-icons span {
      position: absolute;
      font-size: 2rem;
      opacity: 0.25;
      animation: float 6s infinite alternate ease-in-out;
    }
    @keyframes float {
      0% { transform: translateY(0px); }
      100% { transform: translateY(-25px); }
    }
    /* solution 痛点方案 */
    .solution-row {
      display: flex;
      gap: 32px;
      align-items: center;
      margin-bottom: 64px;
      flex-wrap: wrap;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .pain-card, .solution-card {
      flex: 1 1 280px;
      padding: 32px;
    }
    .pain-card {
      background: rgba(255,255,255,0.03);
      border-left: 4px solid var(--danger);
    }
    .solution-card {
      background: var(--bg-card);
      border-left: 4px solid var(--primary);
    }
    /* 数据仪表盘 */
    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 30px;
      justify-content: center;
    }
    .stat-item {
      text-align: center;
      min-width: 160px;
    }
    .stat-number {
      font-size: 3.2rem;
      font-weight: 800;
      font-family: var(--font-mono);
      color: white;
      text-shadow: 0 0 15px var(--primary);
    }
    /* 证言 */
    .testimonials-grid {
      display: flex;
      gap: 24px;
      align-items: flex-start;
      flex-wrap: wrap;
      justify-content: center;
    }
    .testimonial-card {
      flex: 1 1 250px;
      padding: 28px;
      position: relative;
    }
    .testimonial-card.featured {
      border: 1px solid var(--primary);
      box-shadow: 0 0 25px rgba(168,85,247,0.3);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      color: white;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-body);
      padding-left: 28px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* CTA */
    .cta-section {
      background: radial-gradient(circle at center, #1f1140 0%, #0B0E14 80%);
      text-align: center;
    }
    /* footer */
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
      padding: 60px 0 40px;
      border-top: 1px solid rgba(255,255,255,0.05);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero h1 {
        font-size: 2.2rem;
      }
    }
    .copyright {
      text-align: center;
      padding: 20px 0;
      color: rgba(255,255,255,0.4);
      font-size: 0.9rem;
    }

@keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(168,85,247,0.7); }
      70% { box-shadow: 0 0 0 18px rgba(168,85,247,0); }
      100% { box-shadow: 0 0 0 0 rgba(168,85,247,0); }
    }
    .faq-item .faq-question span { transition: 0.2s; }
    .faq-item.open .faq-question span { color: var(--primary); text-shadow: 0 0 8px var(--primary); }