/* roulang page: index */
:root {
      --color-primary: #1B2A1F;
      --color-primary-soft: #2D3A2F;
      --color-bg: #F9FBF8;
      --color-accent: #C8A951;
      --color-accent-hover: #B8993D;
      --color-dark: #0F1A12;
      --color-text: #2D3A2F;
      --color-text-light: #5A6B5C;
      --color-white: #FFFFFF;
      --color-border: #E5EDE3;
      --color-card-bg: #FFFFFF;
      --color-hero-overlay: rgba(27, 42, 31, 0.9);
      --font-display: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
      --font-body: 'Noto Sans SC', system-ui, sans-serif;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-badge: 6px;
      --shadow-card: 0 1px 3px rgba(27, 42, 31, 0.06);
      --shadow-card-hover: 0 8px 24px rgba(27, 42, 31, 0.12);
      --shadow-nav: 0 2px 12px rgba(0,0,0,0.04);
      --transition-smooth: 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --transition-btn: 0.2s ease;
      --container-max: 1280px;
      --header-height: 72px;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--color-bg);
      color: var(--color-text);
      line-height: 1.7;
      font-weight: 400;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    a {
      color: inherit;
      text-decoration: none;
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      font-weight: 600;
      transition: var(--transition-btn);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      border: none;
      outline: none;
      white-space: nowrap;
    }

    button:focus-visible, .btn:focus-visible, a:focus-visible {
      outline: 2px solid var(--color-accent);
      outline-offset: 2px;
      border-radius: 4px;
    }

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

    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--color-white);
      box-shadow: none;
      transition: box-shadow 0.3s ease;
      height: var(--header-height);
      display: flex;
      align-items: center;
    }

    .site-header.scrolled {
      box-shadow: var(--shadow-nav);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--color-primary);
      letter-spacing: 0.5px;
    }

    .logo svg {
      width: 32px;
      height: 32px;
      fill: none;
      stroke: var(--color-accent);
      stroke-width: 1.8;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--color-text);
      font-size: 0.95rem;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }

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

    .btn-primary {
      background: var(--color-accent);
      color: var(--color-primary);
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      font-weight: 700;
      box-shadow: 0 2px 8px rgba(200,169,81,0.2);
    }

    .btn-primary:hover {
      background: var(--color-accent-hover);
      box-shadow: 0 4px 12px rgba(200,169,81,0.4);
      transform: translateY(-1px);
    }

    .btn-primary:active {
      transform: scale(0.97);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--color-primary);
      color: var(--color-primary);
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      font-weight: 600;
    }

    .btn-outline:hover {
      background: rgba(27, 42, 31, 0.06);
    }

    .btn-text {
      background: transparent;
      color: var(--color-primary);
      border-bottom: 1.5px solid var(--color-primary);
      padding: 4px 0;
      font-weight: 600;
      border-radius: 0;
    }

    .btn-text:hover {
      border-bottom-width: 2px;
      color: #0F1A12;
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      padding: 8px;
      z-index: 100;
    }

    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--color-primary);
      transition: 0.3s;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--color-primary);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 48px;
      transform: translateX(100%);
      transition: transform 0.4s ease;
      z-index: 99;
      list-style: none;
    }

    .mobile-menu.active {
      transform: translateX(0);
    }

    .mobile-menu a {
      color: white;
      font-size: 1.4rem;
      font-weight: 500;
    }

    .mobile-menu .btn-primary {
      background: var(--color-accent);
      color: var(--color-primary);
    }

    @media (max-width: 1024px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }

    /* HERO */
    .hero {
      background: linear-gradient(135deg, #1B2A1F 0%, #2D3A2F 100%);
      position: relative;
      overflow: hidden;
      color: white;
      padding: 60px 0;
    }

    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: repeating-linear-gradient(45deg, rgba(255,255,255,0.02) 0px, rgba(255,255,255,0.02) 2px, transparent 2px, transparent 8px);
      pointer-events: none;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      position: relative;
      z-index: 2;
    }

    .hero h1 {
      font-size: 3.2rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
      margin-bottom: 20px;
      color: white;
    }

    .hero-sub {
      font-size: 1.1rem;
      opacity: 0.9;
      margin-bottom: 32px;
      max-width: 90%;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-data {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      background: rgba(255,255,255,0.06);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      border: 1px solid rgba(255,255,255,0.1);
    }

    .data-item {
      text-align: center;
    }

    .data-number {
      font-family: var(--font-display);
      font-weight: 800;
      font-size: 2.8rem;
      color: var(--color-accent);
      line-height: 1.1;
    }

    .data-label {
      font-size: 0.8rem;
      opacity: 0.7;
      margin-top: 8px;
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero h1 {
        font-size: 2.2rem;
      }
      .hero-data {
        grid-template-columns: repeat(3, 1fr);
        padding: 20px;
      }
    }

    /* 通用板块 */
    .section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--color-primary);
    }

    .section-desc {
      color: var(--color-text-light);
      max-width: 700px;
      margin-bottom: 48px;
    }

    /* 功能卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--color-card-bg);
      padding: 28px;
      border-radius: var(--radius-card);
      border: 1px solid var(--color-border);
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
      background: #FAFCF9;
    }

    .feature-icon {
      width: 48px;
      height: 48px;
      margin-bottom: 20px;
      color: var(--color-primary);
    }

    .feature-card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 12px;
    }

    @media (max-width: 1024px) {
      .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 直播场景 */
    .live-card {
      background: var(--color-card-bg);
      max-width: 600px;
      margin: 0 auto;
      border-radius: 24px;
      box-shadow: var(--shadow-card-hover);
      padding: 32px;
      border: 1px solid var(--color-border);
    }

    .match-score {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-family: var(--font-display);
      font-weight: 800;
      font-size: 3.5rem;
      color: var(--color-accent);
    }

    .progress-bar {
      height: 8px;
      background: #e0e7db;
      border-radius: 4px;
      margin: 20px 0;
      overflow: hidden;
    }

    .progress-fill {
      width: 60%;
      height: 100%;
      background: var(--color-accent);
      border-radius: 4px;
    }

    /* 分析区块 */
    .analysis-row {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 40px;
      align-items: center;
    }

    .analysis-img {
      background: #eef3ea;
      border-radius: var(--radius-card);
      overflow: hidden;
      aspect-ratio: 4/3;
    }

    .tag {
      background: rgba(200,169,81,0.12);
      color: #a88c2d;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 0.8rem;
      display: inline-block;
      margin-right: 8px;
    }

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

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

    .pricing-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid var(--color-border);
      text-align: center;
    }

    .pricing-highlight {
      background: var(--color-primary);
      color: white;
      transform: scale(1.02);
      border: none;
    }

    .price {
      font-family: var(--font-display);
      font-weight: 800;
      font-size: 2.8rem;
      color: var(--color-accent);
    }

    .pricing-highlight .price {
      color: var(--color-accent);
    }

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

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    details {
      background: #F4F7F2;
      border-radius: 8px;
      margin-bottom: 12px;
      padding: 16px;
    }

    summary {
      font-weight: 700;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: #0F1A12;
      padding: 80px 0;
      text-align: center;
      color: white;
    }

    /* 页脚 */
    .footer {
      background: #1B2A1F;
      color: rgba(255,255,255,0.8);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }

    @media (max-width: 640px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }