/* roulang page: index */
/* 基础重置与设计变量 */
    :root {
      --red: #C8102E;
      --deep-green: #1B2A1E;
      --gold: #D4AF37;
      --warm-light: #F4F1EA;
      --card-white: #FFFFFF;
      --text-dark: #1E1E1E;
      --text-mid: #5A5A5A;
      --border-light: #E0DCD2;
      --hover-bg: #FDECEC;
      --gold-bg: #FBF5E3;
      --shadow-card: 0 8px 30px rgba(0,0,0,0.06);
      --shadow-hover: 0 16px 40px rgba(0,0,0,0.12);
      --radius-card: 16px;
      --radius-btn: 40px;
      --radius-badge: 20px;
      --transition: 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: var(--warm-light);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    /* 导航 */
    .desktop-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--red);
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      gap: 36px;
      font-weight: 500;
      color: var(--text-dark);
    }
    .nav-links a {
      padding: 8px 0;
      position: relative;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--red);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--red);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: white;
      box-shadow: 0 -4px 15px rgba(0,0,0,0.05);
      padding: 8px 20px 12px;
      z-index: 100;
      justify-content: space-around;
      backdrop-filter: blur(10px);
      background: rgba(255,255,255,0.9);
    }
    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      color: var(--text-mid);
      font-weight: 500;
      gap: 4px;
    }
    .mobile-nav a.active, .mobile-nav a:hover {
      color: var(--red);
    }
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      body {
        padding-bottom: 70px;
      }
    }
    /* 按钮系统 */
    .btn-primary {
      background: linear-gradient(90deg, var(--red), #A00D24);
      color: white;
      font-weight: 700;
      padding: 16px 36px;
      border-radius: var(--radius-btn);
      display: inline-block;
      text-align: center;
      transition: all 0.25s ease;
      box-shadow: 0 4px 12px rgba(200,16,46,0.3);
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      transform: scale(1.02);
      box-shadow: 0 8px 20px rgba(200,16,46,0.4);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--red);
      color: var(--red);
      font-weight: 700;
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      display: inline-block;
      transition: all 0.25s ease;
    }
    .btn-secondary:hover {
      background: var(--hover-bg);
    }
    .btn-white {
      background: white;
      color: var(--red);
      font-weight: 700;
      padding: 16px 42px;
      border-radius: var(--radius-btn);
      display: inline-block;
      box-shadow: 0 6px 18px rgba(0,0,0,0.08);
    }
    /* 板块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #C8102E 0%, #1B2A1E 100%);
      position: relative;
      overflow: hidden;
      padding-top: 140px;
      padding-bottom: 100px;
      color: white;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 200" opacity="0.08"><path d="M0 0h200v200H0z" fill="none"/><path d="M20 20h20v20H20zm60 0h20v20H80zm60 0h20v20h-20zm-120 60h20v20H20zm60 0h20v20H80zm60 0h20v20h-20zM20 140h20v20H20zm60 0h20v20H80zm60 0h20v20h-20z" fill="white"/></svg>');
      background-size: 180px;
    }
    .hero-container {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1;
    }
    .hero h1 {
      font-size: 46px;
      font-weight: 800;
      letter-spacing: -0.5px;
      line-height: 1.2;
      margin-bottom: 20px;
      color: white;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.9);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-badges {
      display: flex;
      gap: 20px;
      margin-top: 28px;
      flex-wrap: wrap;
    }
    .badge {
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(8px);
      border: 1px solid var(--gold);
      color: var(--gold);
      padding: 8px 20px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 14px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .hero-image {
      flex: 1;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }
    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    @media (max-width: 1024px) {
      .hero-container {
        flex-direction: column;
        text-align: center;
      }
      .hero-text {
        order: 1;
      }
      .hero-image {
        order: 0;
        max-width: 500px;
        margin: 0 auto;
      }
    }
    /* 标题通用 */
    h2 {
      font-size: 34px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .section-desc {
      color: var(--text-mid);
      margin-bottom: 48px;
      font-size: 18px;
    }
    /* 卡片系统 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .icon-red {
      color: var(--red);
      font-size: 28px;
      margin-bottom: 20px;
    }
    .badge-gold {
      display: inline-block;
      background: var(--gold-bg);
      border: 1px solid var(--gold);
      color: #B4942E;
      font-weight: 800;
      font-size: 16px;
      padding: 6px 16px;
      border-radius: 20px;
      margin-top: 16px;
    }
    .product-card img {
      border-radius: 12px 12px 0 0;
      height: 200px;
      object-fit: cover;
      width: 100%;
    }
    .product-card .card-content {
      padding: 24px;
    }
    @media (max-width: 1024px) {
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .grid-3 {
        grid-template-columns: 1fr;
        gap: 24px;
      }
    }
    /* 场景交替 */
    .scene-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
      background: #F9F7F3;
      border-radius: 24px;
      padding: 40px;
    }
    .scene-text {
      flex: 1;
    }
    .scene-img {
      flex: 1;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    @media (max-width: 768px) {
      .scene-row {
        flex-direction: column;
        padding: 24px;
      }
    }
    /* 案例卡片滚动 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
    }
    .testimonial-card {
      min-width: 280px;
      background: white;
      border-radius: 20px;
      padding: 24px;
      box-shadow: var(--shadow-card);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 700;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-mid);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* 最终CTA */
    .cta-section {
      background: linear-gradient(135deg, #C8102E, #1B2A1E);
      text-align: center;
      color: white;
      border-radius: 32px;
      margin: 40px 32px;
      padding: 80px 20px;
    }
    /* 页脚 */
    footer {
      background: var(--deep-green);
      color: #B0B5A8;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }