/* roulang page: index */
:root {
      --bg-dark: #0e1117;
      --bg-surface: #161b22;
      --bg-card: #1f242c;
      --bg-card-hover: #262c36;
      --primary-cyan: #00f5a0;
      --primary-blue: #00d9f5;
      --accent-orange: #ff6b35;
      --text-main: #f0f6fc;
      --text-muted: #8b949e;
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(0, 245, 160, 0.35);
      --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    html { scroll-behavior: smooth; }
    body {
      background-color: var(--bg-dark);
      color: var(--text-main);
      font-family: var(--font-stack);
      line-height: 1.75;
      overflow-x: hidden;
      padding-top: 5rem;
    }
    h1, h2, h3, h4, h5, h6 {
      color: #ffffff;
      font-weight: 700;
      line-height: 1.3;
      letter-spacing: -0.02em;
    }
    a { text-decoration: none; transition: all 0.25s ease; }
    p { margin-bottom: 1.25rem; font-size: 0.98rem; }
    .text-cyan { color: var(--primary-cyan) !important; }
    .text-orange { color: var(--accent-orange) !important; }
    .text-dim { color: var(--text-muted); }
    .gradient-text {
      background: linear-gradient(135deg, var(--primary-cyan) 0%, var(--primary-blue) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .badge-tech {
      background: rgba(0, 245, 160, 0.12);
      border: 1px solid rgba(0, 245, 160, 0.3);
      color: var(--primary-cyan);
      font-size: 0.78rem;
      padding: 0.35rem 0.8rem;
      border-radius: 999px;
      font-weight: 600;
      display: inline-block;
    }
    .badge-orange {
      background: rgba(255, 107, 53, 0.15);
      border: 1px solid rgba(255, 107, 53, 0.4);
      color: var(--accent-orange);
      font-size: 0.78rem;
      padding: 0.35rem 0.8rem;
      border-radius: 999px;
      font-weight: 600;
      display: inline-block;
    }
    /* 浮动 Dock 导航 */
    .dock-nav-wrapper {
      position: fixed;
      top: 1rem;
      left: 50%;
      transform: translateX(-50%);
      width: 94%;
      max-width: 1240px;
      z-index: 1050;
    }
    .dock-nav {
      background: rgba(22, 27, 34, 0.88);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.14);
      border-radius: 999px;
      padding: 0.65rem 1.6rem;
      box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45);
    }
    .dock-brand {
      font-size: 1.15rem;
      font-weight: 800;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .dock-brand i { color: var(--primary-cyan); font-size: 1.3rem; }
    .dock-links a {
      color: var(--text-muted);
      font-size: 0.9rem;
      font-weight: 500;
      padding: 0.4rem 0.75rem;
      border-radius: 999px;
    }
    .dock-links a:hover, .dock-links a.active {
      color: #ffffff;
      background: rgba(255, 255, 255, 0.08);
    }
    .btn-dock-action {
      background: linear-gradient(135deg, var(--primary-cyan) 0%, var(--primary-blue) 100%);
      color: #0b1117 !important;
      font-weight: 700;
      font-size: 0.85rem;
      padding: 0.5rem 1.25rem;
      border-radius: 999px;
      border: none;
      box-shadow: 0 4px 14px rgba(0, 245, 160, 0.25);
    }
    .btn-dock-action:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(0, 245, 160, 0.4);
    }
    /* 卡片与通用组件 */
    .g-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      border-radius: 18px;
      padding: 1.8rem;
      transition: transform 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease;
      height: 100%;
    }
    .g-card:hover {
      border-color: var(--border-glow);
      transform: translateY(-4px);
      box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35);
    }
    .g-card.highlight {
      border-color: rgba(0, 245, 160, 0.45);
      background: linear-gradient(180deg, rgba(0, 245, 160, 0.06) 0%, var(--bg-surface) 100%);
      position: relative;
      overflow: hidden;
    }
    .btn-primary-action {
      background: linear-gradient(135deg, var(--primary-cyan) 0%, var(--primary-blue) 100%);
      color: #0b1117;
      font-weight: 700;
      border: none;
      border-radius: 10px;
      padding: 0.75rem 1.6rem;
      transition: all 0.25s ease;
    }
    .btn-primary-action:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(0, 245, 160, 0.35);
      color: #05080c;
    }
    .btn-secondary-action {
      background: rgba(255, 255, 255, 0.06);
      border: 1px solid rgba(255, 255, 255, 0.15);
      color: #ffffff;
      font-weight: 600;
      border-radius: 10px;
      padding: 0.75rem 1.6rem;
      transition: all 0.25s ease;
    }
    .btn-secondary-action:hover {
      background: rgba(255, 255, 255, 0.12);
      border-color: rgba(255, 255, 255, 0.3);
      color: #ffffff;
    }
    .section-wrap {
      padding: 5rem 0;
      position: relative;
    }
    .section-alt {
      background: #12161f;
      border-top: 1px solid rgba(255, 255, 255, 0.04);
      border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    }
    .section-header {
      margin-bottom: 3.2rem;
    }
    .section-header h2 {
      font-size: 2.15rem;
      margin-top: 0.6rem;
      margin-bottom: 0.9rem;
    }
    .section-header p {
      max-width: 720px;
      margin: 0 auto;
      color: var(--text-muted);
    }
    /* Hero */
    .hero-panel {
      position: relative;
      background: linear-gradient(180deg, rgba(14, 17, 23, 0.8) 0%, rgba(14, 17, 23, 0.98) 100%), url('/assets/images/6fd9123b09dabd31.jpg') center/cover no-repeat;
      padding: 5.5rem 0 4.5rem;
      border-bottom: 1px solid var(--border-subtle);
    }
    .param-pill {
      background: rgba(0, 0, 0, 0.45);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: 12px;
      padding: 1.1rem 1.4rem;
    }
    .param-pill .value {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary-cyan);
      line-height: 1.1;
    }
    .param-pill .label {
      font-size: 0.82rem;
      color: var(--text-muted);
      margin-top: 0.3rem;
    }
    /* 表单与交互 */
    .form-control-dark {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.12);
      color: #fff;
      border-radius: 8px;
      padding: 0.65rem 1rem;
    }
    .form-control-dark:focus {
      background: rgba(255, 255, 255, 0.08);
      border-color: var(--primary-cyan);
      box-shadow: 0 0 0 3px rgba(0, 245, 160, 0.2);
      color: #fff;
    }
    /* 折叠手风琴 */
    .accordion-custom .accordion-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      border-radius: 12px !important;
      margin-bottom: 1rem;
      overflow: hidden;
    }
    .accordion-custom .accordion-button {
      background: var(--bg-surface);
      color: #fff;
      font-weight: 600;
      padding: 1.2rem 1.5rem;
      box-shadow: none;
    }
    .accordion-custom .accordion-button:not(.collapsed) {
      background: rgba(0, 245, 160, 0.05);
      color: var(--primary-cyan);
    }
    .accordion-custom .accordion-button::after {
      filter: invert(1);
    }
    .accordion-custom .accordion-body {
      color: var(--text-muted);
      padding: 1.2rem 1.5rem;
      line-height: 1.8;
      border-top: 1px solid var(--border-subtle);
    }
    /* 媒体与图片容器 */
    .img-fluid-rounded {
      border-radius: 14px;
      border: 1px solid var(--border-subtle);
      width: 100%;
      height: 220px;
      object-fit: cover;
    }
    .showcase-banner {
      width: 100%;
      border-radius: 18px;
      border: 1px solid var(--border-subtle);
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    }
    /* 页脚 */
    footer {
      background: #090c10;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 4.5rem 0 2.5rem;
      font-size: 0.9rem;
    }
    footer h5 {
      font-size: 1rem;
      margin-bottom: 1.4rem;
      color: #fff;
    }
    footer ul { list-style: none; padding: 0; margin: 0; }
    footer ul li { margin-bottom: 0.75rem; }
    footer ul li a { color: var(--text-muted); }
    footer ul li a:hover { color: var(--primary-cyan); }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 2rem;
      margin-top: 3rem;
      color: #6e7681;
    }
    @media (max-width: 991px) {
      .dock-links { display: none; }
      body { padding-top: 4.5rem; }
      .section-wrap { padding: 3.8rem 0; }
    }