/* roulang page: index */
:root {
      --primary: #7B2FF7;
      --primary-dark: #6927D9;
      --accent-green: #00F0A8;
      --accent-green-light: #33F5BC;
      --deep-black: #0D0D0F;
      --warm-white: #F5F3F0;
      --mid-gray: #8A8A8E;
      --dark-gray: #1C1C1E;
      --card-dark: #1A1A1E;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --border-light: rgba(255,255,255,0.08);
      --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--dark-gray);
      line-height: 1.6;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, .h1, .h2, .h3 {
      font-weight: 600;
      letter-spacing: -0.02em;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 导航栏重塑 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(13, 13, 15, 0.92);
      backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid transparent;
      transition: background 0.3s, border-color 0.3s;
      display: flex;
      align-items: center;
    }
    .navbar-custom.scrolled {
      background: rgba(13, 13, 15, 1);
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo-area {
      position: absolute;
      left: 50%;
      transform: translateX(-50%);
    }
    .logo-img {
      height: 40px;
      width: auto;
    }
    .nav-left, .nav-right {
      display: flex;
      gap: 32px;
      list-style: none;
      padding: 0;
      margin: 0;
      align-items: center;
    }
    .nav-left a, .nav-right a {
      color: var(--warm-white);
      font-size: 15px;
      font-weight: 500;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-left a:hover, .nav-right a:hover {
      color: var(--accent-green);
    }
    .nav-link.active {
      color: var(--accent-green) !important;
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
    }
    .mobile-menu-toggle {
      display: none;
      background: transparent;
      border: none;
      width: 32px;
      height: 24px;
      flex-direction: column;
      justify-content: space-between;
      cursor: pointer;
      z-index: 1100;
    }
    .mobile-menu-toggle span {
      display: block;
      height: 2px;
      background: var(--warm-white);
      transition: 0.3s;
      width: 100%;
    }
    .mobile-menu-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
    .mobile-menu-toggle.open span:nth-child(2) { opacity: 0; }
    .mobile-menu-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }
    @media (max-width: 1024px) {
      .nav-left, .nav-right {
        display: none;
      }
      .logo-area {
        position: static;
        transform: none;
        margin-left: 16px;
      }
      .mobile-menu-toggle {
        display: flex;
      }
      .nav-container {
        justify-content: space-between;
        padding: 0 24px;
      }
    }
    .mobile-menu-panel {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--deep-black);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 32px;
      z-index: 1050;
      transform: translateY(-100%);
      transition: 0.4s ease;
    }
    .mobile-menu-panel.open {
      transform: translateY(0);
    }
    .mobile-menu-panel a {
      font-size: 22px;
      color: var(--warm-white);
      font-weight: 500;
    }
    /* Hero */
    .hero-section {
      background: var(--deep-black);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: 72px;
    }
    .hero-particles {
      position: absolute;
      inset: 0;
      z-index: 0;
    }
    .particle {
      position: absolute;
      background: var(--primary);
      border-radius: 50%;
      opacity: 0.6;
      animation: float 6s infinite alternate ease-in-out;
    }
    @keyframes float {
      0% { transform: translateY(0px) translateX(0px); opacity: 0.3; }
      100% { transform: translateY(-30px) translateX(20px); opacity: 0.7; }
    }
    .hero-content {
      position: relative;
      z-index: 2;
      color: white;
      max-width: 750px;
    }
    .hero-title {
      font-size: clamp(2.8rem, 8vw, 4rem);
      font-weight: 700;
      line-height: 1.1;
      color: var(--warm-white);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.75);
      margin: 24px 0 32px;
    }
    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
      display: inline-block;
    }
    .btn-primary-custom:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(123,47,247,0.4);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-outline-custom:hover {
      background: rgba(123,47,247,0.1);
      border-color: var(--accent-green);
      color: var(--accent-green);
    }
    .btn-cta-green {
      background: var(--accent-green);
      color: var(--deep-black);
      font-weight: 700;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      border: none;
    }
    .btn-cta-green:hover {
      background: var(--accent-green-light);
      transform: translateY(-2px);
      box-shadow: 0 10px 25px rgba(0,240,168,0.3);
    }
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.8rem;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .pain-card {
      background: var(--warm-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .pain-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .solution-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }
    @media (max-width: 768px) {
      .solution-grid { grid-template-columns: 1fr; }
    }
    .number-big {
      font-size: 4rem;
      font-weight: 700;
      color: var(--accent-green);
      opacity: 0.2;
      position: absolute;
      top: -10px;
      left: 0;
    }
    .dark-bg {
      background: var(--deep-black);
      color: var(--warm-white);
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent-green);
    }
    .testimonial-carousel {
      position: relative;
    }
    .quote-icon {
      font-size: 4rem;
      color: var(--primary);
      opacity: 0.25;
    }
    footer {
      background: var(--deep-black);
      color: var(--warm-white);
      padding: 60px 0 20px;
    }
    .footer-links a:hover {
      color: var(--accent-green);
      padding-left: 4px;
    }
    .social-icon {
      width: 36px; height: 36px;
      border: 1px solid var(--warm-white);
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-right: 8px;
    }
    .social-icon:hover {
      background: var(--accent-green);
      border-color: var(--accent-green);
    }