/* roulang page: index */
:root {
      --bg-dark-midnight: #080D1A;
      --bg-deep-card: rgba(16, 26, 48, 0.72);
      --primary-cyan: #00F2FE;
      --secondary-blue: #4FACFE;
      --accent-orange: #FF5E36;
      --accent-green: #00FF87;
      --text-pure-white: #FFFFFF;
      --text-muted-gray: #A4B3CD;
      --border-trans-blue: rgba(79, 172, 254, 0.22);
      --border-subtle: rgba(255, 255, 255, 0.08);
      --glow-shadow: 0 0 24px rgba(0, 242, 254, 0.35);
      --card-radius: 18px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      background-color: var(--bg-dark-midnight);
      background-image: radial-gradient(circle at 15% 20%, rgba(79, 172, 254, 0.08) 0%, transparent 45%),
                        radial-gradient(circle at 85% 70%, rgba(0, 242, 254, 0.06) 0%, transparent 50%),
                        linear-gradient(180deg, #080D1A 0%, #0D1527 100%);
      background-attachment: fixed;
      color: var(--text-muted-gray);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.65;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }

    /* 刊头双行导航 */
    .masthead-wrapper {
      position: sticky;
      top: 0;
      z-index: 1030;
      background: rgba(8, 13, 26, 0.92);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid var(--border-trans-blue);
    }

    .masthead-top {
      padding: 12px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    }

    .masthead-logo {
      font-size: 1.65rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--text-pure-white);
      display: inline-flex;
      align-items: center;
      gap: 10px;
    }

    .masthead-logo span {
      background: linear-gradient(135deg, var(--primary-cyan), var(--secondary-blue));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .masthead-status-tag {
      font-size: 0.82rem;
      background: rgba(0, 255, 135, 0.12);
      color: var(--accent-green);
      border: 1px solid rgba(0, 255, 135, 0.3);
      padding: 3px 10px;
      border-radius: 30px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .status-pulse {
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background-color: var(--accent-green);
      box-shadow: 0 0 8px var(--accent-green);
    }

    .masthead-nav-bar {
      padding: 8px 0;
    }

    .nav-anchor-link {
      color: var(--text-muted-gray);
      font-size: 0.95rem;
      font-weight: 500;
      padding: 6px 14px;
      border-radius: 8px;
    }

    .nav-anchor-link:hover, .nav-anchor-link.active {
      color: var(--primary-cyan);
      background: rgba(79, 172, 254, 0.1);
    }

    /* 视觉通用类 */
    .glow-btn-primary {
      background: linear-gradient(135deg, var(--secondary-blue), var(--primary-cyan));
      color: #061122 !important;
      font-weight: 700;
      padding: 10px 24px;
      border-radius: 30px;
      border: none;
      box-shadow: var(--glow-shadow);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .glow-btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 32px rgba(0, 242, 254, 0.65);
      color: #000 !important;
    }

    .glow-btn-orange {
      background: linear-gradient(135deg, #FF7E5F, var(--accent-orange));
      color: #FFF !important;
      font-weight: 700;
      padding: 9px 20px;
      border-radius: 30px;
      border: none;
      box-shadow: 0 0 18px rgba(255, 94, 54, 0.4);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .glow-btn-orange:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 28px rgba(255, 94, 54, 0.7);
    }

    .glass-card {
      background: var(--bg-deep-card);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--card-radius);
      transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    }

    .glass-card:hover {
      border-color: var(--border-trans-blue);
      transform: translateY(-4px);
      box-shadow: 0 12px 35px rgba(0, 0, 0, 0.45);
    }

    .section-wrap {
      padding: 85px 0;
      position: relative;
    }

    .section-wrap.alt-bg {
      background: rgba(13, 21, 39, 0.65);
      border-top: 1px solid rgba(255, 255, 255, 0.04);
      border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    }

    .section-header-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(79, 172, 254, 0.12);
      border: 1px solid var(--border-trans-blue);
      color: var(--primary-cyan);
      font-size: 0.85rem;
      font-weight: 600;
      padding: 5px 16px;
      border-radius: 30px;
      margin-bottom: 16px;
      text-transform: uppercase;
    }

    .section-main-title {
      color: var(--text-pure-white);
      font-size: 2.25rem;
      font-weight: 800;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }

    .section-desc-lead {
      color: var(--text-muted-gray);
      font-size: 1.05rem;
      max-width: 820px;
      margin: 0 auto 45px auto;
      line-height: 1.75;
    }

    /* Hero 首屏 */
    .hero-banner-section {
      position: relative;
      padding: 90px 0 110px 0;
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
    }

    .hero-banner-section::before {
      content: "";
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(180deg, rgba(8, 13, 26, 0.88) 0%, rgba(8, 13, 26, 0.96) 100%);
    }

    .hero-content-box {
      position: relative;
      z-index: 2;
    }

    .hero-h1-headline {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-pure-white);
      margin-bottom: 24px;
    }

    .hero-h1-headline span {
      background: linear-gradient(135deg, var(--primary-cyan), var(--secondary-blue));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-lead-text {
      font-size: 1.15rem;
      line-height: 1.8;
      color: #BAC7DE;
      margin-bottom: 35px;
    }

    .store-badge {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.15);
      padding: 10px 20px;
      border-radius: 12px;
      color: #fff;
      font-size: 0.9rem;
    }

    .store-badge:hover {
      background: rgba(255, 255, 255, 0.16);
      border-color: var(--primary-cyan);
    }

    /* 指标看板 */
    .metric-num {
      font-size: 2.8rem;
      font-weight: 800;
      line-height: 1;
      background: linear-gradient(135deg, var(--text-pure-white), var(--primary-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 8px;
    }

    /* 架构技术条目 */
    .tech-pill {
      font-size: 0.82rem;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
      padding: 6px 12px;
      border-radius: 6px;
      display: inline-block;
      margin-right: 8px;
      margin-bottom: 8px;
      color: #C0CCE2;
    }

    /* 对比表格面板 */
    .comp-col-bad {
      background: rgba(255, 255, 255, 0.02);
      border: 1px solid rgba(255, 255, 255, 0.06);
      border-radius: 16px;
      padding: 30px;
    }

    .comp-col-good {
      background: rgba(16, 32, 60, 0.85);
      border: 1px solid var(--primary-cyan);
      box-shadow: 0 0 30px rgba(0, 242, 254, 0.15);
      border-radius: 16px;
      padding: 30px;
      position: relative;
    }

    .comp-badge {
      position: absolute;
      top: -14px;
      right: 25px;
      background: linear-gradient(135deg, var(--primary-cyan), var(--secondary-blue));
      color: #061122;
      font-size: 0.75rem;
      font-weight: 800;
      padding: 4px 14px;
      border-radius: 20px;
    }

    /* 时间轴 */
    .timeline-node {
      position: relative;
      padding-left: 28px;
      border-left: 2px solid var(--border-trans-blue);
      padding-bottom: 35px;
    }

    .timeline-node::before {
      content: "";
      position: absolute;
      left: -7px;
      top: 4px;
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background: var(--primary-cyan);
      box-shadow: 0 0 10px var(--primary-cyan);
    }

    /* FAQ 手风琴重构 */
    .accordion-item {
      background: rgba(16, 26, 48, 0.65) !important;
      border: 1px solid var(--border-subtle) !important;
      border-radius: 12px !important;
      margin-bottom: 14px;
      overflow: hidden;
    }

    .accordion-button {
      background: transparent !important;
      color: var(--text-pure-white) !important;
      font-weight: 600;
      font-size: 1.05rem;
      padding: 20px 24px;
      box-shadow: none !important;
    }

    .accordion-button::after {
      filter: invert(1) hue-rotate(180deg);
    }

    .accordion-button:not(.collapsed) {
      color: var(--primary-cyan) !important;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .accordion-body {
      color: var(--text-muted-gray);
      padding: 20px 24px;
      font-size: 0.98rem;
      line-height: 1.7;
    }

    /* 表单组件 */
    .form-control-glass {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.12);
      color: #fff !important;
      border-radius: 10px;
      padding: 12px 18px;
    }

    .form-control-glass:focus {
      background: rgba(255, 255, 255, 0.08);
      border-color: var(--primary-cyan);
      box-shadow: 0 0 15px rgba(0, 242, 254, 0.25);
    }

    /* Footer */
    .footer-section {
      background: #04070D;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding: 60px 0 35px 0;
      font-size: 0.92rem;
    }

    /* 响应式断点 */
    @media (max-width: 991px) {
      .hero-h1-headline {
        font-size: 2.35rem;
      }
      .section-main-title {
        font-size: 1.85rem;
      }
    }

    @media (max-width: 767px) {
      .masthead-top {
        text-align: center;
      }
      .masthead-nav-bar .container {
        overflow-x: auto;
        white-space: nowrap;
        padding-bottom: 6px;
      }
      .hero-h1-headline {
        font-size: 1.85rem;
      }
      .metric-num {
        font-size: 2.2rem;
      }
      .section-wrap {
        padding: 55px 0;
      }
    }