/* roulang page: index */
/* 全局设计变量与Reset */
    :root {
      --primary: #FF6B4A;
      --secondary: #1A1D29;
      --accent: #00E5A0;
      --bg-light: #F8F9FC;
      --bg-warm: #FFF5F0;
      --text-body: #4A4D59;
      --text-muted: #7A7D89;
      --white: #FFFFFF;
      --border-light: #E8EBF0;
      --shadow-sm: 0 2px 12px rgba(26, 29, 41, 0.06);
      --shadow-md: 0 8px 24px rgba(26, 29, 41, 0.12);
      --shadow-glow: 0 4px 15px rgba(0, 229, 160, 0.4);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --transition: 0.25s ease;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --spacing-grid: 8px;
      --max-width: 1200px;
      --nav-height: 64px;
    }

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

    body {
      font-family: var(--font-sans);
      line-height: 1.6;
      color: var(--text-body);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: var(--transition);
    }

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

    /* 排版工具 */
    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
      color: var(--secondary);
    }

    h1 { font-size: 2.5rem; letter-spacing: -0.5px; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.25rem; font-weight: 600; }

    .section-title {
      margin-bottom: 1rem;
    }
    .section-subtitle {
      color: var(--text-muted);
      font-size: 1.1rem;
      max-width: 640px;
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 0.875rem 2rem;
      font-weight: 600;
      font-size: 1rem;
      border-radius: var(--radius-btn);
      transition: all 0.3s ease;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: white;
      box-shadow: 0 4px 12px rgba(255, 107, 74, 0.3);
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: var(--shadow-glow);
      transform: translateY(-1px);
    }

    .btn-outline {
      border: 1px solid var(--secondary);
      color: var(--secondary);
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--secondary);
      color: white;
    }

    .btn-text {
      color: var(--primary);
      padding: 0.5rem 0;
      font-weight: 500;
    }
    .btn-text:hover {
      text-decoration: underline;
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 100;
      border-bottom: 1px solid rgba(0,0,0,0.02);
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    .logo {
      font-size: 1.75rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      display: flex;
      align-items: baseline;
    }
    .logo .season {
      color: var(--secondary);
    }
    .logo .sport {
      color: var(--primary);
      margin-left: 2px;
    }
    .logo-icon {
      display: inline-block;
      width: 8px;
      height: 8px;
      background: var(--accent);
      border-radius: 50%;
      margin-left: 6px;
      box-shadow: 0 0 8px var(--accent);
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--secondary);
      padding: 0.25rem 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .mobile-toggle {
      display: none;
      font-size: 1.5rem;
      color: var(--secondary);
      background: none;
      border: none;
    }

    /* 底部移动导航 (备用) */
    .mobile-bottom-nav {
      display: none;
    }

    /* 区块通用 */
    section {
      padding: 5rem 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 3.5rem;
    }

    /* Hero */
    .hero {
      padding-top: calc(var(--nav-height) + 2rem);
      background-color: var(--white);
      background-image: radial-gradient(circle at 70% 20%, rgba(0,229,160,0.08) 0%, transparent 50%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-content {
      flex: 1;
    }
    .hero-content h1 {
      margin-bottom: 1.25rem;
    }
    .hero-content p {
      font-size: 1.15rem;
      color: var(--text-body);
      margin-bottom: 2rem;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1;
      position: relative;
    }
    .hero-image img {
      border-radius: 24px;
      box-shadow: var(--shadow-md);
      width: 100%;
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
    }
    .pain-card {
      background: #EEF0F5;
      border-radius: var(--radius-card);
      padding: 1.8rem;
      border-left: 4px solid #B53A3A;
      transition: var(--transition);
    }
    .pain-card i {
      color: #7A7D89;
      font-size: 1.8rem;
      margin-bottom: 1rem;
    }
    .pain-card h3 {
      margin-bottom: 0.5rem;
    }

    /* 功能卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
    }
    .feature-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: all 0.3s ease;
      border-top: 4px solid var(--accent);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .feature-icon {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 1.25rem;
    }
    .feature-card img {
      width: 80px;
      height: 80px;
      object-fit: cover;
      border-radius: 50%;
      margin: 0 auto 1.25rem;
    }

    /* 数据区 */
    .stats-band {
      background: var(--secondary);
      color: white;
      padding: 3.5rem 0;
      border-radius: 24px;
      margin: 2rem 0;
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
    }
    .stat-item .number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--accent);
      line-height: 1.2;
    }
    .stat-item .label {
      color: rgba(255,255,255,0.7);
      font-size: 0.95rem;
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
    }
    .testimonial-card {
      background: var(--bg-warm);
      border-radius: var(--radius-card);
      padding: 2rem;
      position: relative;
    }
    .testimonial-card .quote-icon {
      font-size: 2.5rem;
      color: var(--accent);
      opacity: 0.5;
      position: absolute;
      top: 10px;
      left: 20px;
    }
    .user-row {
      display: flex;
      align-items: center;
      gap: 0.8rem;
      margin-top: 1.5rem;
    }
    .avatar {
      width: 48px;
      height: 48px;
      background: #ddd;
      border-radius: 50%;
      border: 2px solid white;
      background-size: cover;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-bottom: 1px solid var(--border-light);
      transition: 0.3s;
    }
    .faq-question {
      width: 100%;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1.2rem 1.5rem;
      font-weight: 600;
      font-size: 1rem;
      background: transparent;
      border: none;
      cursor: pointer;
      text-align: left;
    }
    .faq-question i {
      color: var(--primary);
      transition: 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 1.5rem;
      background: #F8F9FC;
      transition: max-height 0.3s ease, padding 0.3s;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 0 1.5rem 1.2rem;
    }
    .faq-item.open .faq-question i {
      transform: rotate(45deg);
    }

    /* CTA 转化区 */
    .cta-section {
      background: linear-gradient(135deg, #1A1D29 0%, #2A2D3A 100%);
      border-radius: 32px;
      text-align: center;
      padding: 4rem 2rem;
      color: white;
      margin: 2rem 0;
    }
    .cta-section h2 {
      color: white;
      font-size: 2.2rem;
    }

    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: #9A9DA8;
      padding: 2.5rem 0;
      font-size: 0.9rem;
    }
    .footer-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1rem;
    }
    .footer-links a {
      color: #9A9DA8;
      margin-left: 2rem;
    }
    .footer-links a:hover {
      color: white;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      h1 { font-size: 2rem; }
      .features-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      .nav-links { display: none; }
      .mobile-toggle { display: block; }
      .hero-grid { flex-direction: column; }
      .pain-grid, .testimonial-grid { grid-template-columns: 1fr; }
      .features-grid { grid-template-columns: 1fr; }
      .stats-grid { gap: 2rem; }
      .footer-inner { flex-direction: column; text-align: center; }
      .footer-links a { margin: 0 0.8rem; }
    }
    @media (max-width: 520px) {
      .hero-buttons .btn { width: 100%; justify-content: center; }
      .btn-outline { margin-top: 0.5rem; }
    }