/* roulang page: index */
:root {
      --primary: #FF5E1A;
      --primary-hover: #FF7A3D;
      --accent: #00E5CC;
      --bg-dark: #0D0D12;
      --bg-card: rgba(255,255,255,0.04);
      --text-primary: #F0F0F5;
      --text-secondary: #A0A0B0;
      --radius-lg: 20px;
      --radius-md: 14px;
      --radius-full: 50px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
      --glass-border: 1px solid rgba(255,255,255,0.08);
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-glow: 0 16px 48px rgba(255,94,26,0.25);
      --section-gap: clamp(60px, 10vw, 100px);
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-dark);
      color: var(--text-primary);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease, border-color 0.2s ease;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 按钮体系 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-full);
      font-weight: 600;
      letter-spacing: 0.01em;
      cursor: pointer;
      transition: all 0.25s ease;
      border: none;
      white-space: nowrap;
      font-family: var(--font-sans);
    }

    .btn-primary {
      background: var(--primary);
      color: #fff;
      padding: 14px 36px;
      box-shadow: inset 0 1px 0 rgba(255,255,255,0.2), 0 4px 12px rgba(255,94,26,0.25);
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 24px rgba(255,94,26,0.6), 0 8px 20px rgba(0,0,0,0.5);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid rgba(255,255,255,0.3);
      color: var(--text-primary);
      padding: 14px 36px;
      backdrop-filter: blur(4px);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      box-shadow: 0 0 18px rgba(255,94,26,0.3);
      transform: translateY(-2px);
    }

    .btn-cta {
      font-size: 1.1rem;
      padding: 18px 48px;
      background: var(--primary);
      color: #fff;
      box-shadow: 0 0 28px rgba(255,94,26,0.5);
      animation: pulse-glow 2s ease-in-out infinite;
    }

    @keyframes pulse-glow {
      0% { box-shadow: 0 0 24px rgba(255,94,26,0.5); }
      50% { box-shadow: 0 0 44px rgba(255,94,26,0.8); }
      100% { box-shadow: 0 0 24px rgba(255,94,26,0.5); }
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 16px 0;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      background: transparent;
    }

    .navbar.scrolled {
      background: rgba(13,13,18,0.85);
      backdrop-filter: blur(20px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: center;
      max-width: 1300px;
      margin: 0 auto;
      padding: 0 24px;
      position: relative;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }

    .nav-links.left {
      margin-right: auto;
    }

    .nav-links.right {
      margin-left: auto;
    }

    .nav-links a {
      color: rgba(255,255,255,0.75);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.25rem 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 800;
      font-size: 1.7rem;
      color: var(--primary);
      letter-spacing: 0.02em;
      margin: 0 2rem;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: conic-gradient(from 90deg at 50% 50%, var(--primary), #FFB088);
      border-radius: 8px 2px 8px 2px;
      transform: rotate(15deg);
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      color: var(--text-primary);
      font-size: 1.8rem;
      cursor: pointer;
    }

    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .hamburger { display: block; position: absolute; left: 24px; }
      .nav-container { justify-content: center; }
      .logo { margin: 0; }
    }

    .mobile-menu {
      position: fixed;
      inset: 0;
      background: rgba(8,8,13,0.96);
      backdrop-filter: blur(24px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2.5rem;
      z-index: 999;
      transform: translateX(100%);
      transition: transform 0.35s ease;
    }

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

    .mobile-menu a {
      font-size: 1.8rem;
      font-weight: 600;
      color: var(--text-primary);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 80px;
      background: radial-gradient(circle at 30% 40%, rgba(255,94,26,0.15) 0%, transparent 50%), 
                  linear-gradient(135deg, #0D0D12 0%, #1A1A22 100%);
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 3rem;
      width: 100%;
    }

    .hero-text {
      flex: 1 1 55%;
    }

    .hero-visual {
      flex: 1 1 45%;
      position: relative;
      height: 400px;
    }

    .hero h1 {
      font-size: clamp(2.8rem, 6vw, 4.5rem);
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }

    .gradient-text {
      background: linear-gradient(135deg, #FF5E1A, #FFB088);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      max-width: 480px;
      margin-bottom: 2.5rem;
    }

    .hero-buttons {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }

    .abstract-sport {
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 30%, rgba(255,94,26,0.2) 0%, transparent 60%);
      position: relative;
    }

    .abstract-sport::before {
      content: "";
      position: absolute;
      width: 280px;
      height: 280px;
      border: 2px dashed rgba(255,94,26,0.5);
      border-radius: 50%;
      top: 20%;
      left: 10%;
      animation: rotate 20s linear infinite;
    }

    @keyframes rotate {
      from { transform: rotate(0deg); }
      to { transform: rotate(360deg); }
    }

    /* 通用板块 */
    .section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: clamp(2rem, 4vw, 2.8rem);
      font-weight: 700;
      margin-bottom: 1rem;
      text-align: center;
    }

    .section-desc {
      color: var(--text-secondary);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 3rem;
    }

    /* 优势错落 */
    .advantages-grid {
      display: flex;
      gap: 2rem;
      justify-content: center;
      flex-wrap: wrap;
    }

    .adv-item {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(12px);
      border: var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 2.5rem 2rem;
      flex: 1 1 250px;
      transition: all 0.3s;
      box-shadow: var(--shadow-card);
    }

    .adv-item:nth-child(1) { transform: translateY(-16px); }
    .adv-item:nth-child(3) { transform: translateY(-8px); }

    .adv-icon {
      width: 56px;
      height: 56px;
      background: rgba(255,94,26,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.5rem;
      color: var(--primary);
      font-size: 1.8rem;
      border: 1px solid rgba(255,94,26,0.4);
    }

    .adv-item:hover .adv-icon {
      background: var(--primary);
      color: #fff;
    }

    /* 服务交替 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }

    .service-row.reverse {
      flex-direction: row-reverse;
    }

    .service-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      position: relative;
    }

    .service-img img {
      width: 100%;
      height: 320px;
      object-fit: cover;
    }

    .service-text {
      flex: 1;
    }

    .feature-list {
      list-style: none;
      margin: 1.5rem 0;
    }

    .feature-list li::before {
      content: "●";
      color: var(--accent);
      margin-right: 0.75rem;
      font-size: 0.9rem;
    }

    .text-link {
      color: var(--primary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 0.3rem;
    }

    /* 数据条 */
    .stats-band {
      background: #14141A;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 2rem;
      text-align: center;
    }

    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--primary);
      font-family: var(--font-number);
    }

    /* 案例卡片 */
    .cases-grid {
      display: flex;
      gap: 2rem;
      align-items: flex-start;
      justify-content: center;
      flex-wrap: wrap;
    }

    .case-card {
      background: rgba(255,255,255,0.03);
      border-radius: var(--radius-lg);
      overflow: hidden;
      flex: 1 1 280px;
      transition: 0.3s;
      border: var(--glass-border);
    }

    .case-card:nth-child(2) {
      transform: scale(1.05);
      z-index: 2;
    }

    .case-card:hover {
      transform: translateY(-12px);
      box-shadow: var(--shadow-glow);
    }

    .case-img img {
      height: 200px;
      object-fit: cover;
    }

    .case-info {
      padding: 1.5rem;
    }

    .badge {
      background: var(--primary);
      color: #fff;
      font-size: 0.75rem;
      padding: 0.2rem 1rem;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 0.5rem;
    }

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

    details {
      background: rgba(255,255,255,0.03);
      border-radius: 12px;
      padding: 0;
      margin-bottom: 12px;
      transition: all 0.2s;
    }

    details[open] {
      background: rgba(255,94,26,0.05);
    }

    summary {
      padding: 20px 28px;
      list-style: none;
      display: flex;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
    }

    .faq-content {
      padding: 0 28px 20px;
      color: var(--text-secondary);
      border-left: 3px solid var(--primary);
      margin-left: 28px;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: #14141A;
      position: relative;
      overflow: hidden;
    }

    .cta-banner::before {
      content: "⚽🏃🏆";
      font-size: 8rem;
      position: absolute;
      opacity: 0.03;
      right: -10%;
      top: -20%;
      white-space: pre;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.06);
      margin-top: 2rem;
      padding-top: 1.5rem;
      text-align: center;
      color: var(--text-secondary);
    }

    @media (max-width: 768px) {
      .hero-content { flex-direction: column; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .service-row, .service-row.reverse { flex-direction: column; }
    }