/* roulang page: index */
:root {
      --primary: #4B0EFF;
      --primary-light: #6C3CFF;
      --accent: #FF6B35;
      --bg-dark: #0A0E17;
      --bg-card: rgba(19, 26, 43, 0.75);
      --bg-light-section: #F4F6FC;
      --text-white: #FFFFFF;
      --text-body: #B0C4DE;
      --text-muted: #8E99B0;
      --border-glass: rgba(255, 255, 255, 0.08);
      --border-input: rgba(255, 255, 255, 0.1);
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 20px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-hover: 0 12px 40px rgba(75, 14, 255, 0.25);
      --font-mono: 'Roboto Mono', 'SF Mono', 'Fira Code', monospace;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      --transition: all 0.3s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-dark);
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, .h1, .h2, .h3, .h4 {
      font-weight: 700;
      color: var(--text-white);
      line-height: 1.3;
    }
    h1 {
      font-size: 3.5rem;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 2.5rem;
      margin-bottom: 1.5rem;
    }
    h3 {
      font-size: 1.5rem;
      margin-bottom: 0.75rem;
    }
    a {
      text-decoration: none;
      transition: var(--transition);
      color: var(--primary-light);
    }
    a:hover {
      color: var(--accent);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航 */
    .navbar-custom {
      background: rgba(10, 14, 23, 0.85);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(75, 14, 255, 0.3);
      padding: 0.8rem 0;
      transition: var(--transition);
      z-index: 1030;
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--text-white) !important;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
    }
    .navbar-brand i {
      color: var(--primary-light);
      margin-right: 8px;
      font-size: 2rem;
    }
    .nav-link {
      color: var(--text-body) !important;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.5rem 1.2rem !important;
      position: relative;
      margin: 0 2px;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary-light) !important;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--primary);
      box-shadow: 0 0 12px var(--primary);
      transition: width 0.3s;
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 70%;
    }
    .search-icon {
      color: var(--text-body);
      font-size: 1.2rem;
      cursor: pointer;
      transition: var(--transition);
      margin-left: 1rem;
    }
    .search-icon:hover {
      color: var(--primary-light);
    }
    .hot-tag {
      background: rgba(255,255,255,0.06);
      border-radius: 20px;
      padding: 0.25rem 0.9rem;
      font-size: 0.8rem;
      color: var(--text-body);
      margin-left: 0.5rem;
      transition: var(--transition);
      border: 1px solid transparent;
    }
    .hot-tag:hover {
      background: var(--primary);
      color: white;
      border-color: var(--primary-light);
    }
    .offcanvas {
      background: rgba(10, 14, 23, 0.95);
      backdrop-filter: blur(20px);
    }
    .offcanvas .nav-link {
      color: white !important;
    }
    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, #1a1f35 0%, #0A0E17 70%);
      position: relative;
      overflow: hidden;
    }
    .hero-bg-img {
      position: absolute;
      right: 0;
      top: 0;
      width: 55%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.25;
      mask-image: linear-gradient(to left, rgba(0,0,0,0.8) 0%, transparent 100%);
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-title {
      font-size: 3.8rem;
      font-weight: 800;
      background: linear-gradient(to right, #fff, #c0b0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #B0C4DE;
      max-width: 550px;
      margin: 1.5rem 0 2rem;
    }
    .btn-primary-custom {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
      border: none;
      padding: 0.8rem 2.2rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      color: white;
      box-shadow: 0 0 20px rgba(107,60,255,0.5);
      transition: var(--transition);
    }
    .btn-primary-custom:hover {
      filter: brightness(1.2);
      box-shadow: 0 0 28px rgba(107,60,255,0.8);
      color: white;
    }
    .btn-outline-custom {
      border: 1px solid rgba(255,255,255,0.3);
      background: transparent;
      color: white;
      padding: 0.8rem 2.2rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      border-color: var(--primary);
      background: rgba(75,14,255,0.1);
      color: white;
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      margin-bottom: 3rem;
    }
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-md);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .glass-card:hover {
      transform: translateY(-6px);
      border-color: var(--primary-light);
      box-shadow: var(--shadow-hover);
    }
    .icon-box {
      font-size: 2.2rem;
      color: var(--primary-light);
      margin-bottom: 1.2rem;
    }
    /* 数据优势 */
    #advantages {
      background: rgba(19, 26, 43, 0.5);
    }
    .counter {
      font-family: var(--font-mono);
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    /* 案例卡片 */
    .case-card {
      position: relative;
      border-radius: var(--radius-md);
      overflow: hidden;
      background: #131A2B;
    }
    .case-card img {
      transition: transform 0.4s;
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    .case-card:hover img {
      transform: scale(1.03);
    }
    .case-info {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(0,0,0,0.8));
      padding: 1.5rem;
      color: white;
    }
    .badge-tag {
      background: var(--primary);
      color: white;
      font-size: 0.75rem;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
    }
    /* FAQ */
    .accordion-button {
      background: rgba(255,255,255,0.03);
      color: white;
      font-weight: 600;
      font-size: 1.1rem;
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-sm) !important;
      padding: 1.2rem 1.8rem;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(75,14,255,0.15);
      color: white;
      box-shadow: 0 0 15px rgba(75,14,255,0.3);
    }
    .accordion-button::after {
      filter: brightness(0) invert(1);
    }
    .accordion-body {
      background: rgba(0,0,0,0.3);
      color: var(--text-body);
      border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    }
    /* 联系表单 */
    #contact {
      background: #080C14;
    }
    .form-control {
      background: rgba(255,255,255,0.05);
      border: 1px solid var(--border-input);
      border-radius: var(--radius-sm);
      color: white;
      padding: 0.8rem 1.2rem;
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 12px rgba(75,14,255,0.4);
      background: rgba(255,255,255,0.08);
      color: white;
    }
    .btn-submit {
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      border: none;
      padding: 0.9rem 2rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      box-shadow: 0 0 18px rgba(107,60,255,0.6);
    }
    .btn-submit:hover {
      filter: brightness(1.1);
    }
    footer {
      background: #080C14;
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    footer a {
      color: var(--text-body);
      font-size: 0.85rem;
    }
    footer a:hover {
      color: var(--primary-light);
    }
    .social-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      background: rgba(255,255,255,0.05);
      border-radius: 50%;
      color: white;
      margin-right: 8px;
      transition: var(--transition);
    }
    .social-icon:hover {
      background: var(--primary);
      color: white;
    }
    @media (max-width: 992px) {
      h1 { font-size: 2.8rem; }
      .hero-title { font-size: 2.8rem; }
    }
    @media (max-width: 768px) {
      section { padding: 60px 0; }
      h1 { font-size: 2.2rem; }
      .hero-title { font-size: 2.2rem; }
      #hero { min-height: 70vh; }
      .hero-bg-img { width: 100%; opacity: 0.2; }
    }