/* roulang page: index */
:root {
      --primary: #F15A24;
      --primary-hover: #D94A1A;
      --secondary: #1E1E1E;
      --accent: #C4D600;
      --accent-light: #d9e82b;
      --bg: #FAF8F5;
      --white: #FFFFFF;
      --gray-light: #F9F7F4;
      --border: #e0e0e0;
      --text: #1E1E1E;
      --text-secondary: #5A5A5A;
      --text-muted: #B0B0B0;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.12);
      --radius: 8px;
      --radius-btn: 6px;
      --transition: 0.25s ease;
      --container: 1280px;
      --nav-height: 72px;
      --nav-scroll-height: 56px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Noto Sans SC', sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
    }
    .oswald {
      font-family: 'Oswald', sans-serif;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
      border: none;
      font-weight: 500;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      display: flex;
      align-items: center;
      z-index: 100;
      transition: background 0.3s, height 0.3s, box-shadow 0.3s;
      background: transparent;
      color: white;
    }
    .navbar.scrolled {
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(8px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      color: var(--secondary);
      height: var(--nav-scroll-height);
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }
    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 8px;
      color: inherit;
    }
    .logo-icon {
      font-size: 1.8rem;
      line-height: 1;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 1rem;
      transition: color 0.2s;
      position: relative;
    }
    .navbar:not(.scrolled) .nav-links a {
      color: rgba(255,255,255,0.9);
    }
    .navbar.scrolled .nav-links a {
      color: var(--secondary);
    }
    .nav-links a:hover {
      color: var(--primary) !important;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid currentColor;
      color: inherit;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      background: transparent;
    }
    .navbar:not(.scrolled) .btn-secondary {
      border-color: white;
      color: white;
    }
    .navbar.scrolled .btn-secondary {
      border-color: var(--secondary);
      color: var(--secondary);
    }
    .btn-secondary:hover {
      border-color: var(--primary) !important;
      color: var(--primary) !important;
      background: transparent;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: currentColor;
      transition: 0.2s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(30,30,30,0.98);
      backdrop-filter: blur(12px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 99;
    }
    .mobile-menu a {
      color: white;
      font-size: 1.8rem;
      font-weight: 500;
    }
    .mobile-menu .btn-secondary {
      border-color: white;
      color: white;
      margin-top: 20px;
    }
    /* 按钮系统 */
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 500;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 4px 12px rgba(241,90,36,0.3);
    }
    .btn-cta {
      background: var(--accent);
      color: var(--secondary);
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
    }
    .btn-cta:hover {
      background: #d9e82b;
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1E1E1E 0%, #2a2a2a 100%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
      overflow: hidden;
      padding-top: var(--nav-height);
    }
    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(241,90,36,0.25) 0%, transparent 60%);
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-title {
      font-size: 3.5rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-title span {
      color: var(--primary);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 24px;
    }
    .live-badge {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.95rem;
    }
    .live-dot {
      width: 10px;
      height: 10px;
      background: var(--accent);
      border-radius: 50%;
      animation: pulse 1.5s infinite;
    }
    .hero-image-card {
      position: relative;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }
    .hero-image-card img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/5;
    }
    .hot-matches {
      position: absolute;
      bottom: 16px;
      right: 16px;
      background: rgba(30,30,30,0.85);
      backdrop-filter: blur(8px);
      padding: 16px;
      border-radius: 12px;
      color: white;
      font-size: 0.9rem;
      width: 85%;
    }
    .hot-match-item {
      display: flex;
      justify-content: space-between;
      padding: 6px 0;
      border-bottom: 1px solid rgba(255,255,255,0.15);
    }
    /* 板块通用 */
    .section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2.2rem;
      margin-bottom: 16px;
      color: var(--secondary);
    }
    .section-sub {
      color: var(--text-secondary);
      max-width: 600px;
      margin-bottom: 40px;
    }
    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: var(--white);
      padding: 32px 24px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .feature-icon {
      width: 64px;
      height: 64px;
      background: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 12px;
      margin-bottom: 20px;
      color: white;
      font-size: 28px;
    }
    .feature-number {
      font-family: 'Oswald', sans-serif;
      font-size: 2.8rem;
      color: var(--primary);
      font-weight: 700;
      margin-top: 16px;
    }
    /* 案例瀑布 */
    .case-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
    }
    .case-card {
      background: white;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.25s;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .case-img {
      aspect-ratio: 16/9;
      overflow: hidden;
      position: relative;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: 0.3s;
    }
    .case-card:hover .case-img img {
      transform: scale(1.05);
    }
    .case-tag {
      position: absolute;
      top: 12px;
      left: 12px;
      background: var(--primary);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 500;
    }
    .case-content {
      padding: 20px;
    }
    /* 方案对比 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pricing-card {
      background: white;
      border-radius: 16px;
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      position: relative;
    }
    .pricing-card.popular {
      border: 2px solid var(--primary);
      transform: scale(1.02);
    }
    .popular-badge {
      background: var(--primary);
      color: white;
      padding: 6px 18px;
      border-radius: 20px;
      font-size: 0.8rem;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    .price {
      font-family: 'Oswald', sans-serif;
      font-size: 3rem;
      color: var(--secondary);
      margin: 16px 0;
    }
    /* 数据面板 */
    .data-panel {
      background: var(--secondary);
      color: white;
      padding: 70px 0;
      text-align: center;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 100" opacity="0.05"><path d="M0 50 L200 50" stroke="white" stroke-width="1"/></svg>');
    }
    .stats {
      display: flex;
      justify-content: center;
      gap: 80px;
      flex-wrap: wrap;
    }
    .stat-number {
      font-family: 'Oswald', sans-serif;
      font-size: 3.5rem;
      font-weight: 700;
    }
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: white;
      transition: 0.2s;
    }
    .faq-answer {
      padding: 0 24px 18px;
      display: none;
      color: var(--text-secondary);
      background: var(--gray-light);
      border-left: 4px solid var(--accent);
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA横幅 */
    .cta-band {
      background: var(--primary);
      background-image: radial-gradient(circle at 20% 50%, rgba(0,0,0,0.1) 0%, transparent 50%);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .footer {
      background: var(--secondary);
      color: #B0B0B0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer h4 {
      color: var(--accent);
      margin-bottom: 16px;
      font-size: 1.1rem;
    }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .hero-image-card { max-width: 400px; margin: 0 auto; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .features-grid { grid-template-columns: 1fr; }
      .case-grid { grid-template-columns: 1fr; }
      .pricing-grid { grid-template-columns: 1fr; overflow-x: auto; display: flex; }
      .stats { gap: 30px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @keyframes pulse { 0%{opacity:1;}50%{opacity:0.5;}100%{opacity:1;} }