/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary-red: #C8102E;
      --primary-red-hover: #a50d24;
      --dark-black: #1A1A1A;
      --accent-gold: #D4AF37;
      --bg-warm: #FAFAF7;
      --white: #FFFFFF;
      --gray-50: #f9fafb;
      --gray-100: #f3f4f6;
      --gray-200: #e5e7eb;
      --gray-500: #6b7280;
      --gray-600: #4b5563;
      --gray-700: #374151;
      --gray-800: #1f2937;
      --success-green: #2E7D32;
      --warning-orange: #F57C00;
      --border-light: rgba(0,0,0,0.05);
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.02);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
      --radius-card: 16px;
      --radius-button: 8px;
      --radius-pill: 50px;
      --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
      --font-number: "DIN Alternate", "Roboto Mono", "Inter", monospace;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--dark-black);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: var(--transition-smooth);
      border: none;
      outline: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    /* 导航 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--white);
      border-bottom: 1px solid var(--border-light);
      transition: box-shadow 0.2s;
      height: 72px;
      display: flex;
      align-items: center;
    }
    .navbar.scrolled {
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.5px;
      display: flex;
      align-items: baseline;
      gap: 2px;
    }
    .logo .milan {
      color: var(--primary-red);
    }
    .logo .sport {
      color: var(--dark-black);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-link {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--gray-700);
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--primary-red);
    }
    .btn-download-nav {
      background: var(--primary-red);
      color: white;
      padding: 10px 20px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 0.9rem;
    }
    .btn-download-nav:hover {
      background: var(--primary-red-hover);
      box-shadow: 0 8px 16px rgba(200,16,46,0.25);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--dark-black);
      border-radius: 2px;
      transition: var(--transition-smooth);
    }
    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      gap: 3rem;
      padding: 4rem 0 5rem;
    }
    .hero-left {
      flex: 1 1 50%;
    }
    .hero-right {
      flex: 1 1 50%;
      position: relative;
    }
    .hero-right img {
      border-radius: 24px;
      box-shadow: var(--shadow-md);
      transform: rotate(1deg);
      width: 100%;
      object-fit: cover;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.25;
      letter-spacing: -0.5px;
      margin-bottom: 1.25rem;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--gray-600);
      margin-bottom: 2rem;
      max-width: 480px;
    }
    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-red);
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: var(--primary-red-hover);
      box-shadow: 0 12px 24px rgba(200,16,46,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-red);
      color: var(--primary-red);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-size: 1rem;
    }
    .btn-outline:hover {
      background: rgba(200,16,46,0.04);
    }
    /* 数据亮点 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      margin: 5rem 0;
    }
    .stat-card {
      text-align: center;
      padding: 2rem 1rem;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary-red);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--gray-600);
      font-size: 1rem;
      margin-top: 0.5rem;
    }
    /* 板块标题 */
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
      letter-spacing: -0.3px;
    }
    .section-desc {
      color: var(--gray-600);
      font-size: 1.1rem;
      margin-bottom: 2.5rem;
    }
    /* 功能卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 2rem;
      margin: 3rem 0;
    }
    .feature-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .feature-icon {
      font-size: 2rem;
      margin-bottom: 1.25rem;
    }
    .feature-card h3 {
      font-size: 1.35rem;
      margin-bottom: 0.75rem;
    }
    .feature-card p {
      color: var(--gray-600);
      font-size: 1rem;
    }
    /* 体验瀑布 */
    .showcase-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 2rem;
      margin: 3rem 0;
    }
    .showcase-item {
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
      position: relative;
    }
    .showcase-item img {
      width: 100%;
      height: auto;
      display: block;
    }
    .showcase-item:hover {
      transform: scale(1.02);
      box-shadow: var(--shadow-md);
    }
    /* 对比 */
    .comparison-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
      margin: 3rem 0;
    }
    .compare-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
    }
    .compare-card.milan {
      border-top: 4px solid var(--primary-red);
    }
    .compare-item {
      display: flex;
      justify-content: space-between;
      padding: 1rem 0;
      border-bottom: 1px solid var(--gray-100);
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 3rem auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--gray-200);
      padding: 1.2rem 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--gray-600);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 1rem;
    }
    /* CTA */
    .cta-band {
      background: var(--dark-black);
      color: white;
      text-align: center;
      padding: 5rem 2rem;
      border-radius: 24px;
      margin: 4rem 0;
    }
    .cta-band h2 {
      font-size: 2.5rem;
      margin-bottom: 1rem;
    }
    /* 页脚 */
    .footer {
      background: var(--dark-black);
      color: #aaa;
      padding: 3rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      font-size: 0.9rem;
    }
    @media (max-width: 1024px) {
      .container { padding: 0 20px; }
      .hero { flex-direction: column; }
      .section-title { font-size: 1.8rem; }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .features-grid, .showcase-grid, .highlights-grid, .comparison-row {
        grid-template-columns: 1fr;
      }
      .hero h1 { font-size: 2rem; }
    }