/* roulang page: index */
:root {
      --primary-orange: #FF5F1F;
      --primary-orange-hover: #E54B0C;
      --accent-cyan: #00F5A0;
      --dark-charcoal: #1E1E1E;
      --mid-gray: #2A2A2A;
      --track-white: #F7F5F0;
      --text-light: #E0E0E0;
      --text-muted: #A0A0A0;
      --border-subtle: rgba(255,255,255,0.08);
      --border-active: rgba(255,95,31,0.4);
      --card-shadow: 0 4px 20px rgba(0,0,0,0.08);
      --card-shadow-hover: 0 12px 32px rgba(0,0,0,0.15);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 4px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-mono: 'SF Mono', 'Consolas', 'Menlo', monospace;
      --section-gap: 120px;
      --container-padding: 24px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--dark-charcoal);
      color: var(--text-light);
      line-height: 1.7;
      font-size: 16px;
      margin: 0;
      overflow-x: hidden;
      scroll-behavior: smooth;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
    }

    h1 {
      font-size: 3rem;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 2.25rem;
      margin-bottom: 1rem;
    }

    h3 {
      font-size: 1.5rem;
    }

    p {
      color: var(--text-muted);
    }

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 var(--container-padding);
    }

    /* 按钮系统 */
    .btn-primary-orange {
      background-color: var(--primary-orange);
      border: none;
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      transition: all 0.25s ease;
      letter-spacing: 0.3px;
    }
    .btn-primary-orange:hover {
      background-color: var(--primary-orange-hover);
      transform: scale(1.03);
      color: white;
    }

    .btn-outline-orange {
      background: transparent;
      border: 1.5px solid var(--primary-orange);
      color: var(--primary-orange);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      transition: all 0.25s ease;
    }
    .btn-outline-orange:hover {
      background: var(--primary-orange);
      color: white;
      transform: scale(1.03);
    }

    .btn-text-link {
      color: var(--primary-orange);
      font-weight: 500;
      text-decoration: none;
      position: relative;
      padding-bottom: 2px;
      transition: color 0.2s;
    }
    .btn-text-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 1.5px;
      background: linear-gradient(to right, var(--accent-cyan), var(--primary-orange));
      transform: scaleX(0);
      transform-origin: right;
      transition: transform 0.25s ease;
    }
    .btn-text-link:hover {
      color: var(--primary-orange-hover);
    }
    .btn-text-link:hover::after {
      transform: scaleX(1);
      transform-origin: left;
    }

    /* 导航栏 SaaS 命令栏风格 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1030;
      background: rgba(30, 30, 30, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-subtle);
      padding: 0.5rem 0;
    }
    .logo-text {
      font-size: 1.4rem;
      font-weight: 800;
      color: var(--primary-orange);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 6px;
      text-decoration: none;
    }
    .logo-icon {
      font-size: 1.6rem;
    }
    .nav-link-anchor {
      color: #ccc;
      font-weight: 500;
      margin: 0 0.8rem;
      transition: color 0.2s;
      text-decoration: none;
      position: relative;
    }
    .nav-link-anchor:hover, .nav-link-anchor.active {
      color: var(--primary-orange);
    }
    .nav-link-anchor.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary-orange);
    }
    .search-box {
      background: rgba(255,255,255,0.1);
      border: 1px solid var(--border-subtle);
      border-radius: 20px;
      padding: 8px 18px;
      color: white;
      width: 180px;
      transition: all 0.2s;
    }
    .search-box:focus {
      outline: none;
      border-color: var(--primary-orange);
      background: rgba(0,0,0,0.4);
    }

    /* Hero 动态背景 */
    .hero-section {
      min-height: 100vh;
      background: radial-gradient(circle at 20% 20%, #2A2A2A, #1E1E1E);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }
    .speed-lines {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      pointer-events: none;
    }
    .speed-line {
      position: absolute;
      width: 2px;
      height: 120px;
      background: linear-gradient(to bottom, transparent, rgba(255,95,31,0.15), transparent);
      animation: moveLines 6s infinite linear;
      opacity: 0.5;
    }
    @keyframes moveLines {
      0% { transform: translateY(-100%) rotate(25deg); opacity: 0; }
      50% { opacity: 0.6; }
      100% { transform: translateY(120vh) rotate(25deg); opacity: 0; }
    }
    .live-score-sim {
      background: rgba(20,20,20,0.8);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255,95,31,0.3);
      border-radius: 12px;
      padding: 16px 22px;
      color: white;
      font-family: var(--font-mono);
      display: inline-flex;
      gap: 20px;
      align-items: center;
    }
    .score-digit {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent-cyan);
      animation: pulse 1.2s infinite;
    }
    @keyframes pulse {
      0% { opacity: 1; }
      50% { opacity: 0.7; }
      100% { opacity: 1; }
    }

    /* 板块通用 */
    .section-padding {
      padding: var(--section-gap) 0;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 80px 0;
      }
      h1 { font-size: 2rem; }
      h2 { font-size: 1.8rem; }
    }

    .card-custom {
      background: rgba(42,42,42,0.7);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: all 0.3s ease;
      box-shadow: var(--card-shadow);
    }
    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
      border-color: rgba(255,95,31,0.2);
    }

    .light-bg {
      background-color: var(--track-white);
      color: #222;
    }
    .light-bg p {
      color: #4A4A4A;
    }

    /* 不对称布局 */
    .asymmetric-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .asymmetric-grid {
        grid-template-columns: 1fr;
      }
    }

    .data-highlight {
      font-family: var(--font-mono);
      font-size: 3rem;
      color: var(--accent-cyan);
      font-weight: 700;
    }

    .footer-dark {
      background: #161616;
      color: #999;
      padding: 60px 0 30px;
    }
    .footer-dark a {
      color: #999;
      text-decoration: none;
    }
    .footer-dark a:hover {
      color: var(--primary-orange);
    }

    /* 手风琴自定义 */
    .accordion-button:not(.collapsed) {
      background: rgba(255,95,31,0.1);
      color: var(--primary-orange);
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--primary-orange);
    }