/* roulang page: index */
:root {
      --primary: #FF8C42;
      --primary-soft: #F4C77D;
      --bg-deep: #0B0C10;
      --bg-card: #1A1A1A;
      --bg-elevated: #141414;
      --text-primary: #F5F5F5;
      --text-secondary: #CCCCCC;
      --text-muted: #888888;
      --border-dim: rgba(255, 140, 66, 0.2);
      --border-glow: rgba(255, 140, 66, 0.8);
      --shadow-glow: 0 0 20px rgba(255, 140, 66, 0.3);
      --shadow-btn: 0 0 25px rgba(255, 140, 66, 0.6);
      --radius-card: 16px;
      --radius-btn: 30px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", "SF Pro Display", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      background-color: var(--bg-deep);
      color: var(--text-primary);
      font-family: var(--font-sans);
      line-height: 1.8;
      margin: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4 {
      font-weight: 600;
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: clamp(2.5rem, 6vw, 3.5rem);
      font-weight: 700;
      line-height: 1.2;
    }

    h2 {
      font-size: clamp(2rem, 4.5vw, 2.5rem);
      margin-bottom: 2rem;
      position: relative;
      display: inline-block;
    }

    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -10px;
      width: 60px;
      height: 3px;
      background: var(--primary);
      box-shadow: 0 0 12px var(--primary);
      border-radius: 4px;
    }

    .section-title {
      margin-bottom: 3rem;
    }

    /* 导航栏 - 暗色霓虹风格 */
    .navbar {
      background: rgba(10, 10, 10, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 140, 66, 0.25);
      padding: 0.5rem 0;
      min-height: 70px;
      transition: all 0.25s ease;
    }

    .navbar-brand {
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary) !important;
      text-shadow: 0 0 12px var(--primary);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 0.25rem;
    }

    .navbar-brand i {
      font-size: 1.8rem;
      color: var(--primary);
      filter: drop-shadow(0 0 6px var(--primary));
    }

    .navbar-nav .nav-link {
      color: var(--text-secondary) !important;
      font-weight: 500;
      margin: 0 0.7rem;
      position: relative;
      padding: 0.5rem 0.25rem;
      transition: color 0.2s;
    }

    .navbar-nav .nav-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      box-shadow: 0 0 14px var(--primary);
      transition: width 0.25s ease;
    }

    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: white !important;
      text-shadow: 0 0 8px rgba(255, 140, 66, 0.7);
    }

    .navbar-nav .nav-link:hover::after,
    .navbar-nav .nav-link.active::after {
      width: 100%;
    }

    .btn-neon-nav {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      border-radius: 30px;
      padding: 0.4rem 1.8rem;
      font-weight: 600;
      transition: 0.25s;
      box-shadow: 0 0 8px rgba(255,140,66,0.4);
    }

    .btn-neon-nav:hover {
      background: var(--primary);
      color: #0B0C10;
      box-shadow: 0 0 20px var(--primary);
    }

    .navbar-toggler {
      border-color: var(--primary);
      box-shadow: 0 0 8px var(--primary);
    }

    .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, 140, 66, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }

    /* Hero 首屏 */
    .hero {
      min-height: 100vh;
      background: linear-gradient(0deg, rgba(0,0,0,0.75) 0%, rgba(0,0,0,0.3) 70%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      position: relative;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 650px;
      padding: 2rem 0;
    }

    .hero h1 .highlight {
      color: var(--primary);
      text-shadow: 0 0 18px var(--primary);
    }

    .hero .lead {
      color: var(--text-secondary);
      font-size: 1.25rem;
      max-width: 500px;
      margin: 1.5rem 0 2rem;
    }

    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: #0B0C10;
      font-weight: 700;
      padding: 0.8rem 2.5rem;
      border-radius: var(--radius-btn);
      box-shadow: 0 4px 15px rgba(255,140,66,0.5);
      transition: 0.25s;
    }

    .btn-primary-custom:hover {
      background: #FFA066;
      box-shadow: var(--shadow-btn);
      transform: scale(1.03);
      color: #0B0C10;
    }

    .btn-outline-neon {
      border: 1.5px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 0.8rem 2.5rem;
      border-radius: var(--radius-btn);
      background: transparent;
      transition: 0.25s;
    }

    .btn-outline-neon:hover {
      background: rgba(255,140,66,0.12);
      box-shadow: 0 0 18px rgba(255,140,66,0.5);
      color: white;
    }

    /* 指标看板 */
    .metric-card {
      background: rgba(20, 20, 20, 0.85);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      text-align: center;
      transition: 0.3s;
    }

    .metric-card:hover {
      border-color: var(--border-glow);
      box-shadow: var(--shadow-glow);
      transform: translateY(-3px);
    }

    .metric-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary-soft);
      transition: 0.2s;
    }

    .metric-card:hover .metric-number {
      color: var(--primary);
      transform: scale(1.08);
      text-shadow: 0 0 15px var(--primary);
    }

    /* 服务卡片 */
    .service-card {
      background: #1A1A1A;
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: 0.3s;
      height: 100%;
    }

    .service-card:hover {
      border-color: var(--primary);
      box-shadow: 0 12px 28px rgba(255,140,66,0.25);
      transform: translateY(-5px);
    }

    .service-card img {
      height: 190px;
      object-fit: cover;
      transition: 0.3s;
    }

    .service-card:hover img {
      transform: scale(1.04);
      filter: brightness(1.1);
    }

    /* 对比区域 */
    .comparison-left {
      background: #1A1A1A;
      border-radius: 20px;
      padding: 2rem;
    }

    .comparison-right {
      background: #222;
      border: 1px solid var(--primary);
      border-radius: 20px;
      padding: 2rem;
      box-shadow: 0 0 22px rgba(255,140,66,0.25);
    }

    .divider-glow {
      width: 3px;
      background: linear-gradient(to bottom, transparent, var(--primary), transparent);
      box-shadow: 0 0 18px var(--primary);
      margin: 0 1rem;
    }

    /* FAQ */
    .accordion-button {
      background: #1A1A1A;
      color: #E0E0E0;
      font-weight: 500;
      border-bottom: 1px solid #333;
      box-shadow: none;
    }

    .accordion-button:not(.collapsed) {
      background: #222;
      color: white;
      border-bottom-color: var(--primary);
      box-shadow: 0 0 12px rgba(255,140,66,0.3);
    }

    .accordion-button::after {
      filter: brightness(0) invert(0.8);
    }

    .accordion-body {
      background: #111;
      color: #CCC;
    }

    /* 表单 */
    .form-control, .form-select {
      background: #1E1E1E;
      border: 1px solid #444;
      color: white;
      border-radius: 10px;
      padding: 0.8rem 1.2rem;
    }

    .form-control:focus, .form-select:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(255,140,66,0.25);
      background: #222;
      color: white;
    }

    footer {
      background: #0A0A0A;
      color: #777;
    }

    footer a {
      color: #999;
      text-decoration: none;
    }

    footer a:hover {
      color: var(--primary);
    }

    @media (max-width: 768px) {
      .hero {
        text-align: center;
      }
      .hero .lead {
        margin-left: auto;
        margin-right: auto;
      }
      .divider-glow {
        display: none;
      }
    }