/* roulang page: index */
:root {
      --primary: #111215;
      --accent: #00F298;
      --accent-alt: #7042FF;
      --accent-hover: #00c97d;
      --dark-bg: #181A1F;
      --dark-card: #20232A;
      --light-bg: #F8F9FA;
      --light-card: #FFFFFF;
      --text-main: #0D0F12;
      --text-muted: #4A5056;
      --text-light-muted: #9DA7B3;
      --border-light: rgba(0, 0, 0, 0.08);
      --border-dark: rgba(255, 255, 255, 0.1);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 14px;
      --shadow-sm: 0 4px 18px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 30px rgba(0, 0, 0, 0.09);
      --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }

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

    body {
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--light-bg);
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .section-padding {
      padding-top: 5rem;
      padding-bottom: 5rem;
    }

    @media (min-width: 992px) {
      .section-padding {
        padding-top: 6.5rem;
        padding-bottom: 6.5rem;
      }
    }

    /* 顶部双行导航 */
    .top-announcement {
      background-color: #0b0c0e;
      font-size: 0.8125rem;
      color: #b1b6c0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }
    .top-announcement .badge-event {
      background: rgba(0, 242, 152, 0.15);
      color: var(--accent);
      border: 1px solid rgba(0, 242, 152, 0.3);
      font-weight: 500;
    }
    .site-navbar {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      transition: var(--transition);
    }
    .brand-logo {
      font-size: 1.35rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .brand-logo i {
      color: var(--accent-alt);
      font-size: 1.5rem;
    }
    .nav-link {
      font-weight: 500;
      color: #33383F !important;
      padding: 0.5rem 0.9rem !important;
      font-size: 0.9375rem;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--accent-alt) !important;
    }

    /* 按钮规范 */
    .btn-main {
      background-color: var(--accent);
      color: #05140d;
      font-weight: 600;
      border-radius: var(--radius-sm);
      padding: 0.65rem 1.4rem;
      border: 1px solid var(--accent);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.4rem;
    }
    .btn-main:hover {
      background-color: var(--accent-hover);
      color: #000;
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(0, 242, 152, 0.35);
    }
    .btn-secondary-custom {
      background: #FFFFFF;
      color: var(--primary);
      border: 1px solid rgba(0, 0, 0, 0.15);
      border-radius: var(--radius-sm);
      padding: 0.65rem 1.4rem;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-secondary-custom:hover {
      background: #f1f3f5;
      color: var(--primary);
      transform: translateY(-2px);
    }
    .btn-dark-glow {
      background: var(--accent-alt);
      color: #ffffff;
      font-weight: 600;
      border-radius: var(--radius-sm);
      padding: 0.65rem 1.4rem;
      border: 1px solid var(--accent-alt);
      transition: var(--transition);
    }
    .btn-dark-glow:hover {
      background: #5b2ee6;
      color: #fff;
      box-shadow: 0 6px 20px rgba(112, 66, 255, 0.4);
    }

    /* 首屏 Hero */
    .hero-section {
      background: linear-gradient(180deg, #FFFFFF 0%, #F3F5F8 100%);
      position: relative;
      overflow: hidden;
      padding: 5rem 0 4rem;
    }
    .hero-h1 {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -1px;
      color: var(--primary);
    }
    @media (min-width: 992px) {
      .hero-h1 {
        font-size: 3.4rem;
      }
    }
    .hero-lead {
      font-size: 1.0625rem;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .hero-badges-strip {
      display: flex;
      flex-wrap: wrap;
      gap: 1.5rem;
      padding-top: 1.5rem;
      border-top: 1px solid rgba(0, 0, 0, 0.08);
    }
    .hero-badge-item {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-size: 0.875rem;
      color: #555c65;
      font-weight: 500;
    }
    .hero-badge-item i {
      color: #0b9e63;
      font-size: 1.1rem;
    }
    .hero-visual-card {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.12);
      border: 1px solid rgba(0,0,0,0.06);
    }
    .hero-visual-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      padding: 1.5rem;
      background: linear-gradient(180deg, transparent 0%, rgba(17, 18, 21, 0.88) 100%);
      color: #fff;
    }

    /* 通用卡片 */
    .card-custom {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
      overflow: hidden;
    }
    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(112, 66, 255, 0.25);
    }
    .badge-sub {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      letter-spacing: 0.5px;
      text-transform: uppercase;
      padding: 0.3rem 0.75rem;
      border-radius: 4px;
      margin-bottom: 0.75rem;
    }
    .badge-cyan {
      background: rgba(0, 242, 152, 0.12);
      color: #00965e;
      border: 1px solid rgba(0, 242, 152, 0.3);
    }
    .badge-purple {
      background: rgba(112, 66, 255, 0.1);
      color: var(--accent-alt);
      border: 1px solid rgba(112, 66, 255, 0.25);
    }

    /* 暗色板块通用 */
    .dark-section {
      background-color: var(--primary);
      color: #FFFFFF;
      position: relative;
    }
    .dark-section .card-custom {
      background: var(--dark-card);
      border: 1px solid var(--border-dark);
      color: #FFFFFF;
    }
    .dark-section .card-custom:hover {
      border-color: var(--accent);
    }
    .dark-section p {
      color: var(--text-light-muted);
    }

    /* 拓扑代码窗 */
    .code-mockup {
      background: #0b0c0e;
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-md);
      font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
      font-size: 0.8125rem;
      padding: 1.25rem;
      color: #a0aec0;
      box-shadow: 0 15px 35px rgba(0,0,0,0.3);
    }
    .code-mockup-header {
      display: flex;
      gap: 6px;
      margin-bottom: 0.75rem;
      padding-bottom: 0.5rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
    }
    .dot-red { background: #ff5f56; }
    .dot-yellow { background: #ffbd2e; }
    .dot-green { background: #27c93f; }

    /* 数据指标条 */
    .metric-value {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1;
      letter-spacing: -0.03em;
      color: var(--primary);
      margin-bottom: 0.35rem;
    }
    .metric-title {
      font-size: 0.9375rem;
      font-weight: 600;
      color: var(--text-muted);
    }

    /* 手风琴重构 */
    .accordion-item {
      border: 1px solid var(--border-light) !important;
      border-radius: var(--radius-sm) !important;
      margin-bottom: 0.75rem;
      overflow: hidden;
      background: #FFFFFF;
    }
    .accordion-button {
      font-size: 1rem;
      font-weight: 600;
      color: var(--primary) !important;
      padding: 1.1rem 1.25rem;
      background-color: #FFFFFF !important;
      box-shadow: none !important;
    }
    .accordion-button:not(.collapsed) {
      color: var(--accent-alt) !important;
      background-color: #f8f9fc !important;
    }
    .accordion-body {
      color: var(--text-muted);
      font-size: 0.9375rem;
      line-height: 1.7;
      padding: 1rem 1.25rem 1.25rem;
    }

    /* 合作伙伴Logo墙 */
    .partner-logo-box {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      padding: 1.25rem 1rem;
      text-align: center;
      font-weight: 700;
      color: #64748b;
      font-size: 0.95rem;
      letter-spacing: -0.2px;
      transition: var(--transition);
    }
    .partner-logo-box:hover {
      border-color: var(--accent-alt);
      color: var(--primary);
      box-shadow: var(--shadow-sm);
    }

    /* 页脚 */
    .site-footer {
      background-color: #0b0c0e;
      color: #8b949e;
      font-size: 0.875rem;
      padding: 4.5rem 0 2rem;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .footer-heading {
      color: #f0f6fc;
      font-size: 0.9375rem;
      font-weight: 700;
      margin-bottom: 1.25rem;
    }
    .footer-link-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .footer-link-list li {
      margin-bottom: 0.6rem;
    }
    .footer-link-list a:hover {
      color: var(--accent);
    }