/* roulang page: index */
:root {
      --primary: #C8102E;
      --primary-hover: #A50D24;
      --secondary: #1A1A2E;
      --bg: #F5F0E8;
      --white: #FFFFFF;
      --text: #2D2D2D;
      --title: #1A1A2E;
      --muted: #6B6B6B;
      --accent: #FFB81C;
      --border-light: #E8E3DA;
      --shadow-sm: 0 2px 12px rgba(26, 26, 46, 0.06);
      --shadow-hover: 0 8px 24px rgba(26, 26, 46, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.25s ease;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --max-width: 1200px;
      --section-gap: 100px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      letter-spacing: 0.01em;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: all var(--transition);
    }

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: var(--white);
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      z-index: 50;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-weight: 700;
      font-size: 1.25rem;
      color: var(--primary);
      letter-spacing: -0.3px;
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text);
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }

    .nav-links a:hover {
      color: var(--primary);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: transparent;
      border: none;
      padding: 8px;
      z-index: 60;
    }

    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--secondary);
      transition: var(--transition);
      border-radius: 2px;
    }

    #menu-checkbox {
      display: none;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: calc(100vh - 72px);
      background: var(--secondary);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 55;
    }

    .mobile-menu a {
      color: white;
      font-size: 1.5rem;
      font-weight: 600;
    }

    #menu-checkbox:checked ~ .mobile-menu {
      display: flex;
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: flex; }
    }

    /* Hero */
    .hero-section {
      padding: 140px 0 80px;
      background: var(--bg);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 48px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 40px;
      line-height: 1.2;
      font-weight: 700;
      color: var(--title);
      margin-bottom: 24px;
    }

    .hero-content p {
      font-size: 1.125rem;
      color: var(--muted);
      margin-bottom: 32px;
      max-width: 90%;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      transform: scale(1.03);
    }

    .hero-visual {
      position: relative;
      border-radius: var(--radius-card);
      overflow: hidden;
      background: var(--secondary);
      transform: rotate(-0.5deg);
      box-shadow: var(--shadow-hover);
    }

    .hero-visual img {
      width: 100%;
      height: 320px;
      object-fit: cover;
      opacity: 0.8;
    }

    .score-overlay {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      background: rgba(26, 26, 46, 0.75);
      backdrop-filter: blur(4px);
      padding: 20px 40px;
      border-radius: 16px;
      text-align: center;
    }

    .score-big {
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--accent);
      letter-spacing: 4px;
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .hero-content h1 {
        font-size: 32px;
      }
      .hero-visual {
        transform: none;
      }
      .score-big {
        font-size: 2.8rem;
      }
    }

    /* 亮点 */
    .features-section {
      padding: 0 0 var(--section-gap);
    }

    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      text-align: center;
      transition: all var(--transition);
    }

    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .feature-icon {
      width: 56px;
      height: 56px;
      margin: 0 auto 20px;
      background: #f9f6f0;
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .feature-icon img {
      width: 36px;
      height: 36px;
      object-fit: contain;
    }

    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--title);
      margin-bottom: 12px;
    }

    .feature-card p {
      color: var(--muted);
      font-size: 0.9rem;
    }

    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 流程 */
    .process-section {
      padding: 0 0 var(--section-gap);
    }

    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
      margin-top: 40px;
    }

    .step {
      flex: 1;
      text-align: center;
      position: relative;
    }

    .step-circle {
      width: 40px;
      height: 40px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 16px;
      position: relative;
      z-index: 2;
    }

    .step h4 {
      font-weight: 700;
      color: var(--title);
      margin-bottom: 8px;
    }

    .step p {
      color: var(--muted);
      font-size: 0.9rem;
    }

    .process-line {
      position: absolute;
      top: 20px;
      left: 0;
      width: 100%;
      height: 2px;
      background: rgba(200, 16, 46, 0.25);
      z-index: 1;
    }

    @media (max-width: 768px) {
      .process-steps {
        flex-direction: column;
        gap: 32px;
      }
      .process-line {
        display: none;
      }
    }

    /* 数据瀑布 */
    .data-section {
      padding: 0 0 var(--section-gap);
    }

    .waterfall {
      columns: 2;
      column-gap: 24px;
    }

    .data-card {
      break-inside: avoid;
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
      transition: all var(--transition);
      border: 1px solid var(--border-light);
    }

    .data-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .data-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }

    .data-body {
      padding: 20px;
    }

    .match-teams {
      font-weight: 600;
      color: var(--title);
      margin-bottom: 8px;
    }

    .score-highlight {
      font-size: 2rem;
      font-weight: 800;
      color: var(--secondary);
      transition: color 0.2s;
    }

    .data-card:hover .score-highlight {
      color: var(--accent);
    }

    .date-tag {
      font-size: 0.8rem;
      color: var(--muted);
      margin-top: 8px;
    }

    @media (max-width: 768px) {
      .waterfall {
        columns: 1;
      }
    }

    /* FAQ */
    .faq-section {
      padding: 0 0 var(--section-gap);
      max-width: 720px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg);
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-question {
      padding: 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--title);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: white;
      border-left: 4px solid var(--primary);
      padding: 0 20px;
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 20px;
    }

    .arrow {
      transition: transform 0.3s;
    }

    .faq-item.open .arrow {
      transform: rotate(180deg);
    }

    /* CTA */
    .cta-banner {
      background: linear-gradient(96deg, var(--secondary) 50%, var(--primary) 50%);
      padding: 64px 0;
      text-align: center;
      color: white;
    }

    .cta-banner h2 {
      font-size: 2rem;
      margin-bottom: 16px;
    }

    .btn-accent {
      background: var(--accent);
      color: #1A1A2E;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      margin-top: 24px;
    }

    /* 联系 */
    .contact-section {
      padding: 0 0 var(--section-gap);
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
    }

    .contact-info p {
      margin-bottom: 16px;
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group input,
    .form-group textarea {
      width: 100%;
      border: none;
      border-bottom: 2px solid var(--border-light);
      padding: 12px 4px;
      font-family: inherit;
      background: transparent;
      transition: border 0.2s;
      outline: none;
    }

    .form-group input:focus,
    .form-group textarea:focus {
      border-bottom: 2px solid var(--primary);
    }

    @media (max-width: 768px) {
      .contact-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 页脚 */
    .site-footer {
      background: var(--secondary);
      color: #CCCCCC;
      padding: 48px 0 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }

    .footer-grid a {
      color: #CCCCCC;
      display: block;
      margin-bottom: 8px;
    }

    .footer-grid a:hover {
      color: var(--accent);
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      :root {
        --section-gap: 60px;
      }
    }