/* roulang page: index */
:root {
      --primary-violet: #7B2FF7;
      --primary-cyan: #00F0FF;
      --deep-bg: #0A0E27;
      --deep-card: #151A36;
      --warm-white: #F8F9FC;
      --pure-white: #FFFFFF;
      --text-main: #0A0E27;
      --text-body: #4A4F6A;
      --text-weak: #8E94B2;
      --accent-orange: #FF6B35;
      --success-green: #00D68F;
      --fail-gray: #C4C9D4;
      --border-light: rgba(255,255,255,0.08);
      --shadow-card: 0 8px 24px rgba(123,47,247,0.08);
      --shadow-hover: 0 16px 36px rgba(123,47,247,0.18);
      --radius-card: 24px;
      --radius-btn: 14px;
      --radius-input: 12px;
      --radius-badge: 50px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition-smooth: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, .stats-number {
      font-weight: 700;
      letter-spacing: -0.3px;
    }
    a {
      text-decoration: none;
      transition: var(--transition-smooth);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航栏 SaaS 命令栏风格 */
    .navbar-custom {
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(12px);
      padding: 12px 0;
      box-shadow: 0 6px 18px rgba(0,0,0,0.25);
      position: fixed;
      width: 100%;
      top: 0;
      z-index: 999;
    }
    .logo-text {
      font-size: 26px;
      font-weight: 700;
      color: white;
      letter-spacing: -0.5px;
    }
    .logo-dot {
      color: var(--primary-cyan);
      font-size: 30px;
    }
    .nav-link-anchor {
      color: rgba(255,255,255,0.8);
      margin: 0 6px;
      font-weight: 500;
      font-size: 15px;
      padding: 6px 12px;
      border-radius: 30px;
    }
    .nav-link-anchor:hover, .nav-link-anchor.active {
      color: white;
      background: rgba(123,47,247,0.3);
    }
    .btn-nav-cta {
      background: linear-gradient(135deg, var(--primary-violet), var(--primary-cyan));
      border: none;
      color: white;
      font-weight: 600;
      padding: 8px 18px;
      border-radius: 30px;
      font-size: 14px;
      letter-spacing: 0.3px;
      transition: var(--transition-smooth);
    }
    .btn-nav-cta:hover {
      background: linear-gradient(135deg, var(--primary-cyan), var(--primary-violet));
      transform: scale(1.03);
      color: white;
    }
    .search-icon-nav {
      color: rgba(255,255,255,0.7);
      font-size: 18px;
      margin-right: 14px;
      cursor: pointer;
    }
    .navbar-toggler {
      border: none;
      color: white;
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    /* Hero */
    #hero {
      background: radial-gradient(circle at 20% 30%, #1A1040, #0A0E27);
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-bg-texture {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 400"><path d="M0 0 L400 0 L400 400 L0 400 Z" fill="none" stroke="rgba(123,47,247,0.12)" stroke-width="1.2"/><path d="M80 0 L80 400 M160 0 L160 400 M240 0 L240 400 M320 0 L320 400" stroke="rgba(0,240,255,0.08)" stroke-width="0.8"/></svg>');
      opacity: 0.25;
      pointer-events: none;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 800;
      background: linear-gradient(to right, var(--primary-violet), var(--primary-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -1px;
      line-height: 1.2;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      max-width: 600px;
    }
    .btn-primary-gradient {
      background: linear-gradient(135deg, var(--primary-violet), var(--primary-cyan));
      border: none;
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      transition: var(--transition-smooth);
    }
    .btn-primary-gradient:hover {
      background: linear-gradient(135deg, var(--primary-cyan), var(--primary-violet));
      transform: scale(1.04);
      box-shadow: 0 10px 24px rgba(123,47,247,0.4);
      color: white;
    }
    .btn-outline-light-custom {
      border: 1.5px solid rgba(255,255,255,0.5);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      background: transparent;
      font-weight: 500;
    }
    .btn-outline-light-custom:hover {
      background: rgba(255,255,255,0.08);
      border-color: white;
      color: white;
    }
    .badge-float {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(10px);
      border-radius: 100px;
      padding: 8px 22px;
      color: white;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      animation: pulseGlow 2.8s infinite;
    }
    @keyframes pulseGlow {
      0% { box-shadow: 0 0 0 0 rgba(0,240,255,0.5); }
      50% { box-shadow: 0 0 18px 6px rgba(0,240,255,0.25); }
      100% { box-shadow: 0 0 0 0 rgba(0,240,255,0.5); }
    }
    /* 区块标题 */
    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .title-underline {
      width: 60px;
      height: 4px;
      background: linear-gradient(to right, var(--primary-violet), var(--primary-cyan));
      border-radius: 4px;
      margin: 0 auto 20px;
    }
    /* 服务卡片 */
    .service-card {
      background: var(--pure-white);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      border: 1px solid rgba(0,0,0,0.02);
      height: 100%;
    }
    .service-card:hover {
      transform: translateY(-10px);
      box-shadow: var(--shadow-hover);
    }
    .icon-gradient-circle {
      width: 64px;
      height: 64px;
      background: linear-gradient(135deg, var(--primary-violet), var(--primary-cyan));
      border-radius: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 28px;
      transition: 0.2s;
    }
    .service-card:hover .icon-gradient-circle {
      transform: scale(1.08);
    }
    .comparison-positive {
      border-left: 4px solid var(--primary-violet);
      background: rgba(123,47,247,0.03);
    }
    .faq-item {
      border-bottom: 1px solid rgba(0,0,0,0.05);
      padding: 18px 0;
    }
    .accordion-button:not(.collapsed) {
      background-color: transparent;
      color: var(--primary-violet);
      font-weight: 700;
      box-shadow: none;
    }
    .accordion-button {
      font-weight: 600;
      background: transparent;
      font-size: 17px;
    }
    .footer-dark {
      background: #0A0E27;
      color: #ccc;
    }
    @media (max-width: 768px) {
      .hero-title { font-size: 36px; }
      .comparison-col { margin-bottom: 20px; }
    }