/* roulang page: index */
/* 飞速体育品牌设计系统 —— 动感科技竞技风 */
    :root {
      --primary: #FF4F00;
      --primary-glow: rgba(255,79,0,0.65);
      --dark: #0A0E17;
      --deep-navy: #0B1120;
      --accent-purple: #8A2BE2;
      --accent-cyan: #00FF87;
      --white: #FFFFFF;
      --surface: #F8F9FC;
      --card-bg: #FFFFFF;
      --border-light: #E5E7EB;
      --text-body: #4B5563;
      --text-muted: #6B7280;
      --text-dark: #1F2937;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-input: 12px;
      --shadow-sm: 0 10px 25px -10px rgba(0,0,0,0.08);
      --shadow-hover: 0 20px 35px -10px rgba(0,0,0,0.15);
      --transition: all 0.28s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--surface);
      color: var(--text-body);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input, textarea {
      font-family: inherit;
      outline: none;
    }
    h1, h2, h3 {
      font-weight: 700;
    }
    
    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      padding: 18px 0;
      transition: background 0.3s ease, box-shadow 0.3s ease;
      background: transparent;
    }
    .nav-bar.scrolled {
      background: var(--white);
      box-shadow: 0 10px 25px -15px rgba(0,0,0,0.08);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      font-size: 1.9rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--white);
      transition: color 0.3s;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .scrolled .logo {
      color: var(--dark);
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary), var(--accent-purple));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      color: white;
      font-weight: 700;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 500;
      color: rgba(255,255,255,0.9);
      transition: color 0.3s;
    }
    .scrolled .nav-links {
      color: var(--text-dark);
    }
    .nav-links a {
      position: relative;
      padding: 6px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta-btn {
      background: var(--primary);
      color: white !important;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      letter-spacing: 0.8px;
      transition: var(--transition);
      box-shadow: 0 6px 18px rgba(255,79,0,0.4);
      border: none;
    }
    .scrolled .nav-cta-btn {
      box-shadow: 0 8px 20px rgba(255,79,0,0.5);
    }
    .nav-cta-btn:hover {
      background: #ff6020;
      box-shadow: 0 12px 28px rgba(255,79,0,0.7);
      transform: scale(1.02);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: transparent;
      border: none;
      width: 30px;
    }
    .hamburger span {
      width: 100%;
      height: 3px;
      background: white;
      transition: 0.3s;
      border-radius: 4px;
    }
    .scrolled .hamburger span {
      background: var(--dark);
    }
    @media (max-width: 1024px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }
    
    /* 移动端导航菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--dark);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 38px;
      z-index: 99;
      transform: translateX(100%);
      transition: 0.35s ease;
    }
    .mobile-menu.open {
      transform: translateX(0);
    }
    .mobile-menu a {
      font-size: 2rem;
      color: white;
      font-weight: 600;
      transition: color 0.2s;
    }
    .mobile-menu a:hover {
      color: var(--primary);
    }
    
    /* Hero */
    .hero {
      background: var(--dark);
      min-height: 95vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding: 120px 0 80px;
    }
    .hero::before {
      content: "";
      position: absolute;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(138,43,226,0.18) 0%, transparent 50%),
                  radial-gradient(circle at 80% 20%, rgba(255,79,0,0.25) 0%, transparent 55%);
      pointer-events: none;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 50px;
      position: relative;
      z-index: 2;
    }
    .hero-left {
      flex: 1.1;
    }
    .hero-right {
      flex: 0.9;
      display: flex;
      justify-content: center;
    }
    .hero h1 {
      font-size: 58px;
      font-weight: 900;
      line-height: 1.15;
      color: white;
      margin-bottom: 24px;
      letter-spacing: -1px;
    }
    .hero-highlight {
      color: var(--primary);
      background: linear-gradient(135deg, #FF7840, #FF4F00);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-sub {
      font-size: 20px;
      color: rgba(255,255,255,0.75);
      margin-bottom: 38px;
      line-height: 1.6;
      max-width: 540px;
    }
    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 18px;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 16px 38px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      letter-spacing: 1px;
      border: none;
      transition: 0.3s;
      box-shadow: 0 0 18px rgba(255,79,0,0.5);
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: #ff5e1a;
      box-shadow: 0 0 28px rgba(255,79,0,0.8);
    }
    .btn-outline {
      border: 2px solid white;
      color: white;
      padding: 16px 38px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      letter-spacing: 1px;
      background: transparent;
      transition: 0.3s;
    }
    .btn-outline:hover {
      background: rgba(255,79,0,0.25);
      border-color: var(--primary);
    }
    .hero-graphic {
      width: 100%;
      max-width: 480px;
      aspect-ratio: 1/1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 28px;
      filter: drop-shadow(0 25px 30px rgba(138,43,226,0.35));
      opacity: 0.9;
    }
    
    /* 通用板块 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 42px;
      font-weight: 800;
      text-align: center;
      margin-bottom: 21px;
      color: var(--text-dark);
      letter-spacing: -0.5px;
    }
    .section-sub {
      text-align: center;
      color: #6B7280;
      font-size: 19px;
      margin-bottom: 55px;
    }
    
    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 26px;
    }
    .pain-card {
      background: var(--card-bg);
      padding: 34px 26px;
      border-radius: var(--radius-card);
      transition: var(--transition);
      border-left: 5px solid transparent;
    }
    .pain-card:hover {
      box-shadow: var(--shadow-hover);
      border-left-color: var(--primary);
      transform: translateY(-6px);
    }
    .pain-icon {
      font-size: 2.4rem;
      color: var(--accent-cyan);
      margin-bottom: 18px;
    }
    
    /* 解决方案 中心辐射/卡片 */
    .solution-wrapper {
      display: flex;
      flex-direction: column;
      align-items: center;
    }
    .core-engine {
      width: 100px;
      height: 100px;
      background: radial-gradient(circle, rgba(255,79,0,0.3), transparent);
      border: 2px dashed var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 30px;
      animation: spinSlow 10s linear infinite;
    }
    @keyframes spinSlow { 100% { transform: rotate(360deg); } }
    .solution-cards {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 25px;
      width: 100%;
      margin-top: 25px;
    }
    .sol-card {
      background: rgba(10,14,23,0.7);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,79,0,0.3);
      padding: 28px;
      border-radius: var(--radius-card);
      color: white;
    }
    
    /* 数据成果 */
    .stats-row {
      display: flex;
      gap: 45px;
      align-items: center;
    }
    .big-stat {
      font-size: 46px;
      font-weight: 900;
      background: linear-gradient(to right, #8A2BE2, #FF4F00);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    
    /* 证言 */ 
    .testimonial-card {
      background: white;
      padding: 42px;
      border-radius: 32px;
      display: flex;
      gap: grocery;
    }
    
    /* footer */
    .footer {
      background: var(--dark);
      color: #9CA3AF;
      padding: 65px 0 30px;
    }
    
    @media (max-width: 768px) {
      .hero-grid, .stats-row, .pain-grid, .solution-cards {
        flex-direction: column;
        grid-template-columns: 1fr;
      }
      h1 { font-size: 40px; }
      .hero-right { display: none; }
    }