/* roulang page: index */
:root {
      --bg-dark: #0A0E17;
      --bg-surface: #0D1527;
      --card-bg: rgba(16, 26, 46, 0.72);
      --card-hover: rgba(22, 36, 64, 0.88);
      --primary: #00D2FF;
      --primary-hover: #00A6CC;
      --accent: #3A7BD5;
      --warning-orange: #FF6B00;
      --text-white: #FFFFFF;
      --text-body: #C5D1E8;
      --text-muted: #6C7D9B;
      --border-hud: rgba(0, 210, 255, 0.22);
      --border-hud-glow: rgba(0, 210, 255, 0.65);
      --glow-shadow: 0 0 25px rgba(0, 210, 255, 0.35);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      background-color: var(--bg-dark);
      background-image: 
        radial-gradient(circle at 15% 15%, rgba(0, 210, 255, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 85% 85%, rgba(58, 123, 213, 0.06) 0%, transparent 45%),
        linear-gradient(180deg, #0A0E17 0%, #0D1527 50%, #0A0E17 100%);
      color: var(--text-body);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
      line-height: 1.7;
      overflow-x: hidden;
    }

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

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

    /* 战术修饰线条与徽章 */
    .hud-bracket {
      position: relative;
    }
    .hud-bracket::before, .hud-bracket::after {
      content: '';
      position: absolute;
      width: 10px;
      height: 10px;
      border-color: var(--primary);
      pointer-events: none;
      transition: var(--transition);
    }
    .hud-bracket::before {
      top: -1px;
      left: -1px;
      border-top: 2px solid var(--primary);
      border-left: 2px solid var(--primary);
    }
    .hud-bracket::after {
      bottom: -1px;
      right: -1px;
      border-bottom: 2px solid var(--primary);
      border-right: 2px solid var(--primary);
    }

    .badge-tactical {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(0, 210, 255, 0.12);
      border: 1px solid var(--border-hud);
      color: var(--primary);
      font-size: 0.82rem;
      font-weight: 600;
      letter-spacing: 1px;
      padding: 5px 14px;
      border-radius: 30px;
      text-transform: uppercase;
    }

    /* 顶部通知条 */
    .top-bar {
      background: rgba(7, 10, 18, 0.9);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      font-size: 0.82rem;
      padding: 8px 0;
      color: var(--text-muted);
      backdrop-filter: blur(8px);
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background-color: #00FF88;
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 10px #00FF88;
      animation: pulse-dot 2s infinite;
    }
    @keyframes pulse-dot {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.5; transform: scale(0.85); }
    }
    .lang-capsule {
      background: rgba(255, 255, 255, 0.06);
      border: 1px solid rgba(255, 255, 255, 0.12);
      padding: 2px 10px;
      border-radius: 20px;
      font-size: 0.76rem;
      color: var(--text-body);
    }
    .lang-capsule span.active {
      color: var(--primary);
      font-weight: bold;
    }

    /* 核心导航栏 */
    .main-navbar {
      background: rgba(10, 14, 23, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-hud);
      transition: var(--transition);
      z-index: 1030;
    }
    .navbar-brand {
      color: var(--text-white) !important;
      font-size: 1.45rem;
      font-weight: 800;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-icon-box {
      width: 40px;
      height: 40px;
      background: linear-gradient(135deg, rgba(0, 210, 255, 0.2), rgba(58, 123, 213, 0.4));
      border: 1px solid var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      box-shadow: 0 0 15px rgba(0, 210, 255, 0.3);
    }
    .nav-link {
      color: var(--text-body) !important;
      font-weight: 500;
      padding: 0.5rem 1rem !important;
      font-size: 0.95rem;
      transition: var(--transition);
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary) !important;
      text-shadow: 0 0 8px rgba(0, 210, 255, 0.4);
    }

    /* 按钮重构 */
    .btn-tactical {
      background: linear-gradient(135deg, #00D2FF 0%, #0072FF 100%);
      color: #030d1a !important;
      font-weight: 700;
      border: none;
      padding: 0.75rem 1.8rem;
      border-radius: var(--radius-sm);
      letter-spacing: 0.5px;
      box-shadow: 0 0 20px rgba(0, 210, 255, 0.45);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .btn-tactical:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 30px rgba(0, 210, 255, 0.75);
      color: #000 !important;
    }
    .btn-outline-tactical {
      background: rgba(16, 26, 46, 0.6);
      border: 1px solid var(--border-hud);
      color: var(--primary) !important;
      font-weight: 600;
      padding: 0.75rem 1.8rem;
      border-radius: var(--radius-sm);
      backdrop-filter: blur(10px);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .btn-outline-tactical:hover {
      background: rgba(0, 210, 255, 0.15);
      border-color: var(--primary);
      color: #ffffff !important;
      box-shadow: 0 0 15px rgba(0, 210, 255, 0.3);
    }

    /* Section 通用规范 */
    section {
      padding: 90px 0;
      position: relative;
    }
    .section-alt {
      background: rgba(13, 21, 39, 0.5);
      border-top: 1px solid rgba(0, 210, 255, 0.08);
      border-bottom: 1px solid rgba(0, 210, 255, 0.08);
    }
    .section-title {
      color: var(--text-white);
      font-size: 2.25rem;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 1rem;
      letter-spacing: -0.5px;
    }
    .section-desc {
      color: var(--text-body);
      font-size: 1.05rem;
      line-height: 1.8;
      max-width: 780px;
      margin: 0 auto 3rem auto;
    }

    /* 玻璃拟态卡片 */
    .tactical-card {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-hud);
      border-radius: var(--radius-md);
      padding: 2.2rem;
      height: 100%;
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }
    .tactical-card:hover {
      background: var(--card-hover);
      border-color: var(--border-hud-glow);
      box-shadow: var(--glow-shadow);
      transform: translateY(-5px);
    }

    /* 板块 1: 首屏 HUD 轮播 Hero */
    .hero-section {
      padding: 60px 0 100px 0;
      min-height: calc(100vh - 100px);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-carousel-item {
      min-height: 520px;
      display: flex;
      align-items: center;
    }
    .hero-title {
      font-size: 3.2rem;
      font-weight: 900;
      line-height: 1.2;
      color: var(--text-white);
      margin-bottom: 1.5rem;
      text-shadow: 0 0 35px rgba(0, 210, 255, 0.3);
    }
    .hero-lead {
      font-size: 1.15rem;
      color: var(--text-body);
      line-height: 1.8;
      margin-bottom: 2.2rem;
    }
    .hero-mockup-frame {
      border: 1px solid var(--border-hud);
      border-radius: var(--radius-lg);
      padding: 8px;
      background: rgba(16, 26, 46, 0.4);
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 30px rgba(0, 210, 255, 0.2);
      position: relative;
    }
    .hero-mockup-frame img {
      border-radius: var(--radius-md);
      width: 100%;
      height: 420px;
      object-fit: cover;
    }

    /* 板块 2: 生态与架构参数面板 */
    .spec-board {
      background: rgba(8, 14, 26, 0.8);
      border: 1px solid var(--border-hud);
      border-radius: var(--radius-md);
      padding: 2.5rem;
    }
    .spec-item {
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 1.2rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .spec-item:last-child {
      border-bottom: none;
    }
    .spec-val {
      font-weight: 700;
      color: var(--primary);
      font-family: monospace;
      font-size: 1.15rem;
    }

    /* 板块 4: 热门游戏沉浸卡 */
    .game-card-img-wrap {
      position: relative;
      height: 220px;
      overflow: hidden;
      border-radius: var(--radius-sm);
      margin-bottom: 1.4rem;
    }
    .game-card-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .tactical-card:hover .game-card-img-wrap img {
      transform: scale(1.08);
    }
    .online-indicator-bar {
      height: 6px;
      background: rgba(255, 255, 255, 0.1);
      border-radius: 4px;
      overflow: hidden;
      margin: 12px 0;
    }
    .online-indicator-fill {
      height: 100%;
      background: linear-gradient(90deg, var(--accent), var(--primary));
      border-radius: 4px;
    }

    /* 板块 5: 战术部署步骤进度轴 */
    .step-node {
      position: relative;
      padding: 1.8rem;
      background: var(--card-bg);
      border: 1px solid var(--border-hud);
      border-radius: var(--radius-md);
      height: 100%;
    }
    .step-num {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: rgba(0, 210, 255, 0.15);
      border: 2px solid var(--primary);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.3rem;
      margin-bottom: 1.2rem;
      box-shadow: 0 0 15px rgba(0, 210, 255, 0.3);
    }

    /* 板块 8: 数据统计条 */
    .stat-counter-box {
      text-align: center;
      padding: 2.5rem 1rem;
    }
    .stat-number {
      font-size: 3.2rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 0.5rem;
      font-family: monospace;
      text-shadow: 0 0 20px rgba(0, 210, 255, 0.4);
    }
    .stat-label {
      color: var(--text-white);
      font-weight: 600;
      font-size: 1.05rem;
    }

    /* 板块 12: FAQ 手风琴深色改写 */
    .accordion-tactical .accordion-item {
      background: var(--card-bg);
      border: 1px solid var(--border-hud);
      margin-bottom: 1rem;
      border-radius: var(--radius-sm) !important;
      overflow: hidden;
    }
    .accordion-tactical .accordion-button {
      background: transparent;
      color: var(--text-white);
      font-weight: 700;
      font-size: 1.1rem;
      padding: 1.4rem 1.8rem;
      box-shadow: none !important;
    }
    .accordion-tactical .accordion-button:not(.collapsed) {
      color: var(--primary);
      background: rgba(0, 210, 255, 0.08);
      border-left: 4px solid var(--primary);
    }
    .accordion-tactical .accordion-button::after {
      filter: invert(1);
    }
    .accordion-tactical .accordion-body {
      color: var(--text-body);
      font-size: 1rem;
      line-height: 1.8;
      padding: 1.5rem 1.8rem 2rem 1.8rem;
      background: rgba(10, 14, 23, 0.4);
    }

    /* 页脚 */
    footer {
      background: #05070d;
      border-top: 1px solid rgba(0, 210, 255, 0.15);
      padding: 70px 0 30px 0;
      color: var(--text-muted);
      font-size: 0.92rem;
    }
    footer h5 {
      color: var(--text-white);
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 1.4rem;
    }
    footer ul {
      list-style: none;
      padding: 0;
    }
    footer ul li {
      margin-bottom: 0.8rem;
    }
    footer ul li a:hover {
      color: var(--primary);
      padding-left: 4px;
    }
    .footer-divider {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      margin: 40px 0 25px 0;
    }

    /* 移动端微调 */
    @media (max-width: 991px) {
      .hero-title {
        font-size: 2.3rem;
      }
      .section-title {
        font-size: 1.85rem;
      }
      .hero-carousel-item {
        min-height: auto;
        padding-bottom: 2rem;
      }
      .hero-mockup-frame {
        margin-top: 2.5rem;
      }
      .stat-number {
        font-size: 2.4rem;
      }
    }