/* roulang page: index */
:root {
      --color-primary: #3E2C26;
      --color-accent: #C8A87C;
      --color-accent-hover: #B08D5E;
      --color-bg: #F7F5F2;
      --color-dark-bg: #1C2622;
      --color-text: #3A3A3C;
      --color-muted: #6B6B6F;
      --color-border: #E8E5DF;
      --color-white: #FFFFFF;
      --color-focus: #C8A87C;
      --radius-card: 8px;
      --radius-btn: 4px;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --transition: 0.3s ease;
      --container-max: 1200px;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--color-bg);
      color: var(--color-text);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    a:hover {
      color: var(--color-accent);
      text-decoration: underline;
      text-underline-offset: 4px;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
      z-index: 99;
      border-bottom: 1px solid transparent;
      transition: box-shadow var(--transition), border-color var(--transition);
    }

    .site-header.scrolled {
      box-shadow: 0 2px 12px rgba(0,0,0,0.06);
      border-bottom: 1px solid var(--color-border);
    }

    .nav-grid {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

    .logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--color-primary);
      letter-spacing: 0.02em;
      white-space: nowrap;
    }

    .logo i {
      color: var(--color-accent);
      margin-right: 6px;
    }

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

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--color-text);
      padding-bottom: 4px;
      border-bottom: 2px solid transparent;
      transition: border-color var(--transition), color var(--transition);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--color-primary);
      border-bottom-color: var(--color-accent);
      text-decoration: none;
    }

    .btn-nav {
      background: var(--color-accent);
      color: white !important;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      transition: background var(--transition);
    }

    .btn-nav:hover {
      background: var(--color-accent-hover);
      text-decoration: none;
    }

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

    @media (max-width: 1023px) {
      .nav-links {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: var(--color-bg);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2.5rem;
        z-index: 100;
      }

      .nav-links.open {
        display: flex;
      }

      .hamburger {
        display: block;
        z-index: 101;
      }

      .close-menu {
        position: absolute;
        top: 25px;
        right: 25px;
        font-size: 2rem;
        background: none;
        border: none;
        color: var(--color-primary);
        cursor: pointer;
      }
    }

    /* Hero */
    .hero {
      position: relative;
      height: 100vh;
      min-height: 600px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      color: white;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(to top, rgba(62,44,38,0.7) 0%, rgba(28,38,34,0.3) 70%, transparent 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      margin-left: 5%;
      padding: 0 20px;
    }

    .hero h1 {
      font-family: var(--font-heading);
      font-size: 3.8rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 1.2rem;
      color: white;
    }

    .hero .subtitle {
      font-size: 1.2rem;
      line-height: 1.7;
      margin-bottom: 2.5rem;
      color: rgba(255,255,255,0.9);
      max-width: 550px;
    }

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

    .btn-outline-light {
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: transparent;
      transition: all var(--transition);
    }

    .btn-outline-light:hover {
      background: white;
      color: var(--color-primary);
      text-decoration: none;
    }

    .btn-solid-accent {
      background: var(--color-accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      transition: background var(--transition);
    }

    .btn-solid-accent:hover {
      background: var(--color-accent-hover);
      text-decoration: none;
    }

    @media (max-width: 768px) {
      .hero {
        height: 85vh;
        min-height: 500px;
      }
      .hero h1 {
        font-size: 2.4rem;
      }
      .hero .subtitle {
        font-size: 1rem;
      }
      .hero-buttons .btn-outline-light,
      .hero-buttons .btn-solid-accent {
        width: 100%;
        text-align: center;
      }
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-family: var(--font-heading);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--color-primary);
      margin-bottom: 1rem;
      letter-spacing: -0.02em;
    }

    .section-subtitle {
      color: var(--color-muted);
      max-width: 600px;
      margin-bottom: 3.5rem;
      font-size: 1.1rem;
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      .section-title {
        font-size: 2rem;
      }
    }

    /* 品牌背书 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 2rem;
      text-align: center;
    }

    .stat-item {
      flex: 1 1 180px;
    }

    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--color-accent);
      line-height: 1.2;
    }

    .stat-label {
      color: var(--color-muted);
      font-size: 0.95rem;
      margin-top: 0.5rem;
    }

    /* 业务卡片 */
    .business-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .biz-card {
      background: var(--color-white);
      border-radius: var(--radius-card);
      border: 1px solid var(--color-border);
      overflow: hidden;
      transition: transform var(--transition), box-shadow var(--transition);
    }

    .biz-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .biz-card img {
      height: 220px;
      object-fit: cover;
    }

    .biz-card-body {
      padding: 1.5rem;
    }

    .biz-card h3 {
      font-weight: 700;
      font-size: 1.4rem;
      margin-bottom: 0.5rem;
      color: var(--color-primary);
    }

    .biz-card p {
      color: var(--color-muted);
      font-size: 0.95rem;
    }

    @media (max-width: 1023px) {
      .business-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 640px) {
      .business-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 案例左右交替 */
    .case-block {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }

    .case-block.reverse {
      flex-direction: row-reverse;
    }

    .case-img {
      flex: 0 0 55%;
      border-radius: var(--radius-card);
      overflow: hidden;
    }

    .case-img img {
      width: 100%;
      height: 360px;
      object-fit: cover;
    }

    .case-text {
      flex: 1;
    }

    .case-text h3 {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--color-primary);
    }

    .case-location {
      color: var(--color-accent);
      margin: 0.75rem 0 1rem;
      font-weight: 500;
    }

    .case-highlight {
      display: flex;
      gap: 1.5rem;
      margin-top: 1.5rem;
      flex-wrap: wrap;
    }

    .highlight-tag {
      background: #f0ede8;
      padding: 6px 16px;
      border-radius: 20px;
      font-size: 0.9rem;
      color: var(--color-primary);
    }

    @media (max-width: 768px) {
      .case-block, .case-block.reverse {
        flex-direction: column;
      }
      .case-img {
        flex: auto;
      }
    }

    /* 品牌哲学 */
    .philosophy-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .philo-card {
      text-align: center;
      padding: 2rem;
      background: var(--color-white);
      border-radius: var(--radius-card);
      border: 1px solid var(--color-border);
    }

    .philo-card i {
      font-size: 2.2rem;
      color: var(--color-accent);
      margin-bottom: 1.2rem;
    }

    @media (max-width: 768px) {
      .philosophy-grid {
        grid-template-columns: 1fr;
      }
    }

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

    .faq-item {
      background: var(--color-white);
      border-radius: var(--radius-card);
      margin-bottom: 8px;
      border: 1px solid var(--color-border);
    }

    .faq-question {
      padding: 1.2rem 1.8rem;
      font-weight: 700;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--color-primary);
    }

    .faq-answer {
      padding: 0 1.8rem 1.5rem;
      display: none;
      color: var(--color-muted);
      line-height: 1.9;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--color-dark-bg);
      padding: 5rem 0;
      text-align: center;
      color: white;
    }

    .cta-banner h2 {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--color-accent);
    }

    /* 页脚 */
    .site-footer {
      background: var(--color-dark-bg);
      color: #B0B5B2;
      padding: 4rem 0 1.5rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 2rem;
    }

    .footer-brand p {
      margin: 1rem 0;
    }

    .footer-links h4 {
      color: white;
      margin-bottom: 1rem;
    }

    .footer-links a {
      display: block;
      color: #B0B5B2;
      margin-bottom: 0.5rem;
    }

    .copyright {
      border-top: 1px solid #2e3a34;
      margin-top: 2.5rem;
      padding-top: 1.5rem;
      text-align: center;
      font-size: 0.9rem;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    button:focus-visible, a:focus-visible {
      outline: 2px solid var(--color-focus);
      outline-offset: 2px;
    }