/* roulang page: index */
:root {
      --primary: #7B2FF7;
      --primary-dark: #5a1db8;
      --primary-light: #9D4EDD;
      --accent: #00E5FF;
      --dark-bg: #0E0E12;
      --dark-surface: #1A1A22;
      --light-bg: #F7F7FA;
      --white: #FFFFFF;
      --text-dark: #1A1A1F;
      --text-gray: #4A4A55;
      --text-light: #E0E0E0;
      --text-muted: #B0B0BB;
      --success: #00E676;
      --danger: #FF5252;
      --border-light: rgba(255,255,255,0.08);
      --border-dark: #E0E0E5;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.10);
      --radius-card: 10px;
      --radius-btn: 6px;
      --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --transition: 0.25s cubic-bezier(0.2, 0.0, 0, 1.0);
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--light-bg);
      color: var(--text-dark);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, h5, h6 {
      font-weight: 600;
      line-height: 1.3;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    /* 覆盖 Bootstrap 默认 */
    .btn {
      border-radius: var(--radius-btn);
      font-weight: 600;
      padding: 0.75rem 2rem;
      transition: var(--transition);
      letter-spacing: 0.3px;
    }
    .btn-primary {
      background-color: var(--primary);
      border-color: var(--primary);
      color: white;
    }
    .btn-primary:hover, .btn-primary:focus {
      background-color: var(--primary-dark);
      border-color: var(--primary-dark);
      transform: scale(1.02);
      box-shadow: 0 4px 12px rgba(123,47,247,0.3);
    }
    .btn-outline-primary {
      border-color: var(--primary);
      color: var(--primary);
      background: transparent;
    }
    .btn-outline-primary:hover {
      background-color: rgba(123,47,247,0.08);
      border-color: var(--primary);
      color: var(--primary);
      transform: scale(1.02);
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(123,47,247,0.15);
    }

    /* 容器微调 */
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1050;
      background: transparent;
      transition: background 0.3s, box-shadow 0.3s;
    }
    #header.scrolled {
      background: rgba(14,14,18,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.6rem;
      color: white !important;
      letter-spacing: 1px;
    }
    .navbar-brand span {
      color: var(--accent);
    }
    .nav-link {
      color: rgba(255,255,255,0.8) !important;
      font-weight: 500;
      margin: 0 0.2rem;
      padding: 0.5rem 0.9rem !important;
      border-radius: 4px;
      transition: var(--transition);
    }
    .nav-link:hover, .nav-link.active {
      color: white !important;
      background: rgba(255,255,255,0.1);
    }
    .hot-tag {
      background: rgba(0,229,255,0.15);
      color: var(--accent);
      font-size: 0.75rem;
      font-weight: 600;
      padding: 0.2rem 0.7rem;
      border-radius: 20px;
      letter-spacing: 0.4px;
    }
    .navbar-toggler {
      border-color: rgba(255,255,255,0.5);
    }
    .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, 0.7)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }

    /* Hero */
    #hero {
      background-color: var(--dark-bg);
      background-image: radial-gradient(circle at 30% 40%, rgba(123,47,247,0.15) 0%, transparent 45%);
      min-height: 75vh;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
      overflow: hidden;
    }
    .hero-bg-particles {
      position: absolute;
      top:0; left:0; width:100%; height:100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-title {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
    }
    .hero-title .highlight {
      color: var(--accent);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      max-width: 600px;
      margin-top: 1.2rem;
    }

    /* 区块通用 */
    section {
      padding: 120px 0;
    }
    .section-dark {
      background-color: var(--dark-bg);
      color: white;
    }
    .section-light {
      background-color: var(--light-bg);
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 1rem;
    }
    .section-sub {
      color: var(--text-gray);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }
    .dark .section-sub {
      color: var(--text-muted);
    }

    /* 数据卡片 */
    .data-card {
      background: var(--dark-surface);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      transition: var(--transition);
    }
    .data-number {
      font-family: var(--font-mono);
      font-size: 2.6rem;
      font-weight: 700;
      color: white;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .trend-up { color: var(--success); }
    .trend-down { color: var(--danger); }
    .data-label {
      font-size: 0.9rem;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: var(--text-muted);
      margin-top: 0.5rem;
    }

    /* 服务卡片左右结构 */
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      display: flex;
      gap: 1.5rem;
      align-items: flex-start;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid transparent;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(123,47,247,0.15);
    }
    .service-icon {
      font-size: 2rem;
      color: var(--primary);
      width: 48px;
      text-align: center;
    }
    .service-text h3 {
      font-size: 1.3rem;
      font-weight: 600;
    }
    .service-text p {
      color: var(--text-gray);
      margin: 0;
    }

    /* 对比区 */
    .compare-highlight {
      border-left: 4px solid var(--primary);
      padding-left: 1.2rem;
    }
    .compare-table td {
      padding: 0.8rem 1rem;
      border-bottom: 1px solid #eee;
    }
    .compare-table .uwin-val {
      font-weight: 700;
      color: var(--primary);
    }

    /* FAQ */
    .accordion-button {
      font-weight: 600;
      font-size: 1.1rem;
      background: white;
      box-shadow: none;
    }
    .accordion-button:not(.collapsed) {
      color: var(--primary);
      background-color: #f9f7ff;
    }
    .accordion-item {
      border: none;
      border-bottom: 1px solid #eee;
    }

    /* 表单区 */
    .contact-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2.5rem;
      box-shadow: var(--shadow-sm);
    }

    /* 页脚 */
    #footer {
      background: var(--dark-bg);
      color: var(--text-light);
      padding: 3rem 0;
      border-top: 1px solid var(--primary);
    }
    #footer a {
      color: var(--text-muted);
    }
    #footer a:hover {
      color: var(--accent);
    }

    /* 响应式 */
    @media (max-width: 992px) {
      .hero-title { font-size: 2.5rem; }
      section { padding: 80px 0; }
    }
    @media (max-width: 768px) {
      .hero-title { font-size: 2rem; }
      .service-card { flex-direction: column; }
      .data-number { font-size: 2rem; }
    }