/* roulang page: index */
:root {
      --gold-medal: #C8A44E;
      --stone-dark: #1E1E1E;
      --warm-porcelain: #FAF8F5;
      --sport-red: #D94E3C;
      --text-primary: #2C2C2C;
      --text-secondary: #6B6B6B;
      --border-light: #E8E4DE;
      --bg-light: #F5F3EF;
      --shadow-sm: 0 8px 24px rgba(0, 0, 0, 0.06);
      --radius-lg: 12px;
      --radius-md: 8px;
      --radius-btn: 6px;
      --radius-img: 4px;
      --transition-smooth: 0.3s ease;
      --font-serif: '思源宋体', 'Noto Serif SC', 'Times New Roman', '宋体', 'SimSun', 'Songti SC', serif;
      --font-sans: '苹方', 'PingFang SC', '微软雅黑', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-porcelain);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
    }

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

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

    button, input, select, textarea {
      font-family: inherit;
    }

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

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      z-index: 1000;
      background: rgba(250, 248, 245, 0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: background 0.3s, border-color 0.3s;
    }

    .site-header.scrolled {
      background: rgba(250, 248, 245, 0.95);
      border-bottom: 1px solid var(--border-light);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-family: var(--font-serif);
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--gold-medal);
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo::before {
      content: "🏆";
      font-size: 1.8rem;
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.5rem;
      list-style: none;
    }

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-primary);
      position: relative;
      padding: 8px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--gold-medal);
      transition: width 0.25s ease;
    }

    .nav-links a:hover {
      color: var(--gold-medal);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-consult {
      background: var(--sport-red);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      transition: background 0.25s, transform 0.2s;
      margin-left: 0.5rem;
    }
    .btn-consult:hover {
      background: var(--stone-dark);
      color: var(--warm-porcelain);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 2rem;
      color: var(--text-primary);
      cursor: pointer;
      line-height: 1;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--warm-porcelain);
      z-index: 999;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: flex-start;
      padding: 0 40px;
      transform: translateX(100%);
      transition: transform 0.35s ease;
      list-style: none;
    }
    .mobile-menu.active {
      transform: translateX(0);
    }
    .mobile-menu a {
      font-size: 1.6rem;
      font-weight: 500;
      color: var(--stone-dark);
      margin: 20px 0;
      display: block;
    }
    .mobile-menu .btn-consult {
      display: inline-block;
      margin-top: 2rem;
      font-size: 1.4rem;
      padding: 14px 36px;
    }
    .close-menu {
      position: absolute;
      top: 24px;
      right: 32px;
      background: none;
      border: none;
      font-size: 2.5rem;
      cursor: pointer;
      color: var(--text-primary);
    }

    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      display: flex;
      align-items: center;
      gap: 4rem;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "CHAMPION";
      position: absolute;
      left: -40px;
      top: 20px;
      font-size: 180px;
      font-weight: 900;
      color: rgba(200, 164, 78, 0.04);
      white-space: nowrap;
      pointer-events: none;
      letter-spacing: 20px;
    }
    .hero-content {
      flex: 1;
      z-index: 2;
    }
    .hero h1 {
      font-family: var(--font-serif);
      font-size: 3.5rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--stone-dark);
      margin-bottom: 1.2rem;
    }
    .hero .subtitle {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2.5rem;
      max-width: 480px;
    }
    .btn-group {
      display: flex;
      align-items: center;
      gap: 2rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--gold-medal);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1.1rem;
      transition: background 0.25s, transform 0.2s;
      box-shadow: 0 4px 12px rgba(200,164,78,0.3);
    }
    .btn-primary:hover {
      background: var(--stone-dark);
      color: var(--warm-porcelain);
      box-shadow: 0 8px 20px rgba(0,0,0,0.12);
    }
    .btn-ghost {
      color: var(--text-primary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      border-bottom: 2px solid transparent;
    }
    .btn-ghost:hover {
      color: var(--gold-medal);
      border-bottom-color: var(--gold-medal);
    }
    .hero-visual {
      flex: 1;
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .hero-visual img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .hero-visual::after {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(to right, rgba(250,248,245,0.3) 0%, transparent 70%);
    }

    @media (max-width: 768px) {
      .hero {
        flex-direction: column;
        padding: 120px 0 60px;
      }
      .hero h1 { font-size: 2.2rem; }
      .hero-visual { margin-top: 2rem; }
    }

    /* 通用板块 */
    section {
      padding: 120px 0;
    }
    .section-title {
      font-family: var(--font-serif);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--stone-dark);
      margin-bottom: 1rem;
      text-align: center;
    }
    .section-desc {
      color: var(--text-secondary);
      text-align: center;
      max-width: 680px;
      margin: 0 auto 4rem;
    }

    /* 核心优势 - 错位图文 */
    .advantages-grid {
      display: flex;
      flex-direction: column;
      gap: 6rem;
      margin-top: 3rem;
    }
    .adv-item {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .adv-item.reverse {
      flex-direction: row-reverse;
    }
    .adv-text {
      flex: 1;
    }
    .adv-text h3 {
      font-family: var(--font-serif);
      font-size: 1.9rem;
      margin-bottom: 1rem;
      color: var(--stone-dark);
      position: relative;
      padding-left: 20px;
      border-left: 4px solid var(--gold-medal);
    }
    .adv-text p {
      color: var(--text-secondary);
      font-size: 1.1rem;
    }
    .adv-icon {
      flex: 1;
      background: var(--border-light);
      height: 280px;
      border-radius: var(--radius-lg);
      overflow: hidden;
    }
    .adv-icon img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    @media (max-width: 768px) {
      .adv-item, .adv-item.reverse {
        flex-direction: column;
      }
      .adv-icon { width: 100%; height: 220px; }
    }

    /* 产品体系卡片 */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .product-card {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all var(--transition-smooth);
    }
    .product-card:hover {
      transform: translateY(-4px);
      border-color: var(--gold-medal);
      box-shadow: var(--shadow-sm);
    }
    .product-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: var(--radius-md) var(--radius-md) 0 0;
    }
    .product-card h3 {
      font-family: var(--font-serif);
      font-size: 1.4rem;
      padding: 1.2rem 1.5rem 0.5rem;
    }
    .product-card p {
      padding: 0 1.5rem 1.5rem;
      color: var(--text-secondary);
      font-size: 0.95rem;
    }
    @media (max-width: 1024px) {
      .product-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 640px) {
      .product-grid { grid-template-columns: 1fr; }
    }

    /* 使用场景交替 */
    .scene-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 5rem;
    }
    .scene-row.reverse {
      flex-direction: row-reverse;
    }
    .scene-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      height: 340px;
    }
    .scene-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .scene-content {
      flex: 1;
    }
    .scene-content h3 {
      font-family: var(--font-serif);
      font-size: 2rem;
      margin-bottom: 1rem;
    }
    .scene-content ul {
      list-style: none;
      margin-top: 1.5rem;
    }
    .scene-content li {
      margin-bottom: 0.7rem;
      display: flex;
      align-items: baseline;
      gap: 8px;
    }
    .scene-content li::before {
      content: "•";
      color: var(--gold-medal);
      font-weight: bold;
      font-size: 1.4rem;
    }
    @media (max-width: 768px) {
      .scene-row, .scene-row.reverse {
        flex-direction: column;
      }
    }

    /* 案例数据 */
    .stats-bar {
      display: flex;
      justify-content: space-around;
      background: white;
      border-radius: var(--radius-lg);
      padding: 2.5rem;
      margin-bottom: 3rem;
      box-shadow: var(--shadow-sm);
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--sport-red);
      font-family: var(--font-sans);
    }
    .client-logos {
      display: flex;
      justify-content: center;
      gap: 2rem;
      flex-wrap: wrap;
      opacity: 0.7;
      margin: 2rem 0;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 1.4rem 0;
      font-size: 1.15rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: var(--bg-light);
      border-left: 4px solid var(--gold-medal);
      padding: 0 1.5rem;
      margin-bottom: 0.5rem;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 1.2rem 1.5rem;
    }

    /* CTA 横幅 */
    .cta-band {
      background: var(--stone-dark);
      color: white;
      text-align: center;
      padding: 5rem 2rem;
      border-radius: var(--radius-lg);
      margin: 80px 0;
    }
    .cta-band h2 {
      font-family: var(--font-serif);
      font-size: 2.4rem;
      margin-bottom: 1rem;
    }
    .input-group {
      display: flex;
      gap: 12px;
      max-width: 600px;
      margin: 2rem auto;
      flex-wrap: wrap;
    }
    .input-group input, .input-group select {
      flex: 1;
      padding: 12px 16px;
      border: none;
      border-bottom: 2px solid rgba(255,255,255,0.4);
      background: transparent;
      color: white;
      outline: none;
    }
    .input-group input:focus {
      border-bottom-color: var(--gold-medal);
    }

    footer {
      background: var(--stone-dark);
      color: #ccc;
      padding: 4rem 0 2rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }