/* roulang page: index */
:root {
      --primary: #C85A2C;
      --primary-hover: #A84820;
      --secondary: #E8A317;
      --dark: #2A1A0F;
      --light: #FDF8F3;
      --text: #4A3B2F;
      --muted: #8C7B6B;
      --border: #E8DDD2;
      --white: #FFFFFF;
      --radius: 12px;
      --radius-sm: 8px;
      --radius-pill: 20px;
      --shadow: 0 2px 12px rgba(42, 26, 15, 0.06);
      --shadow-hover: 0 6px 24px rgba(42, 26, 15, 0.12);
      --shadow-btn: 0 2px 8px rgba(200, 90, 44, 0.25);
      --font-serif: 'Noto Serif SC', 'Source Han Serif SC', 'STSong', 'Songti SC', serif;
      --font-sans: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--light);
      color: var(--text);
      line-height: 1.75;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      color: var(--dark);
      margin-top: 0;
    }

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

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

    .container {
      max-width: 1140px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    @media (min-width: 1400px) {
      .container {
        max-width: 1320px;
      }
    }

    /* 导航栏 */
    .navbar {
      background-color: rgba(253, 248, 243, 0.95);
      backdrop-filter: blur(8px);
      box-shadow: 0 1px 10px rgba(0,0,0,0.03);
      padding: 0.75rem 0;
      transition: var(--transition);
    }

    .navbar-brand {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary) !important;
      letter-spacing: 0.5px;
    }

    .navbar .nav-link {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text) !important;
      padding: 0.4rem 1rem !important;
      border-radius: var(--radius-pill);
      margin: 0 0.1rem;
      transition: var(--transition);
    }

    .navbar .nav-link:hover {
      background-color: var(--border);
      color: var(--dark) !important;
    }

    .navbar .nav-link.active {
      background-color: var(--primary);
      color: white !important;
    }

    .btn-primary-custom {
      background-color: var(--primary);
      border: none;
      color: white;
      font-weight: 600;
      padding: 0.5rem 1.5rem;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-btn);
      transition: var(--transition);
      font-size: 0.9rem;
      white-space: nowrap;
    }

    .btn-primary-custom:hover {
      background-color: var(--primary-hover);
      color: white;
      box-shadow: 0 4px 14px rgba(168, 72, 32, 0.4);
      transform: translateY(-1px);
    }

    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 0.5rem 1.5rem;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      font-size: 0.9rem;
      white-space: nowrap;
    }

    .btn-outline-custom:hover {
      background-color: var(--primary);
      color: white;
      border-color: var(--primary);
      box-shadow: var(--shadow-btn);
      transform: translateY(-1px);
    }

    .offcanvas {
      background-color: var(--light);
    }

    .offcanvas .nav-link {
      font-size: 1rem;
      padding: 0.6rem 1.5rem !important;
      border-radius: var(--radius-pill);
      margin: 0.2rem 0;
    }

    /* Hero */
    .hero-section {
      padding: 6rem 0 5rem;
      background-color: var(--light);
      background-image: radial-gradient(circle at 70% 30%, rgba(232, 163, 23, 0.08) 0%, transparent 50%);
      position: relative;
    }

    .hero-title {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--dark);
      margin-bottom: 1.25rem;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text);
      margin-bottom: 2rem;
      max-width: 480px;
    }

    .hero-image-wrapper {
      position: relative;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 0 10px 30px rgba(42,26,15,0.08);
    }

    .hero-image-wrapper img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }

    .hero-image-wrapper::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 20% 80%, rgba(200,90,44,0.15), transparent 60%);
      pointer-events: none;
    }

    /* 区块标题 */
    .section-title {
      font-size: 2rem;
      font-weight: 600;
      color: var(--dark);
      margin-bottom: 0.75rem;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 40px;
      height: 3px;
      background-color: var(--primary);
      border-radius: 2px;
    }

    .text-center .section-title::after {
      left: 50%;
      transform: translateX(-50%);
    }

    .section-subtitle {
      color: var(--muted);
      font-size: 1rem;
      margin-bottom: 2.5rem;
    }

    /* 卡片通用 */
    .card-custom {
      background: var(--white);
      border: none;
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      transition: var(--transition);
      height: 100%;
    }

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

    /* 核心优势 */
    .advantage-card {
      padding: 2rem 1.5rem;
      text-align: center;
    }

    .advantage-icon {
      width: 56px;
      height: 56px;
      margin: 0 auto 1.25rem;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      transition: transform 0.3s ease;
    }

    .card-custom:hover .advantage-icon {
      transform: scale(1.08);
    }

    .advantage-card h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
    }

    .advantage-card p {
      font-size: 0.95rem;
      color: var(--text);
      line-height: 1.7;
    }

    /* 产品矩阵 */
    .product-card .product-img {
      height: 200px;
      object-fit: cover;
      border-radius: var(--radius) var(--radius) 0 0;
      transition: transform 0.4s ease;
    }

    .product-card:hover .product-img {
      transform: scale(1.03);
    }

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

    .product-card h3 {
      font-size: 1.25rem;
      font-weight: 600;
    }

    .badge-tag {
      background-color: rgba(232, 163, 23, 0.2);
      color: var(--primary);
      font-weight: 500;
      font-size: 0.8rem;
      padding: 0.2rem 0.7rem;
      border-radius: var(--radius-pill);
      display: inline-block;
      margin-right: 0.4rem;
      margin-bottom: 0.5rem;
    }

    /* 品质流程 */
    .process-step {
      text-align: center;
      position: relative;
      flex: 1;
    }

    .step-number {
      width: 52px;
      height: 52px;
      background-color: var(--primary);
      color: white;
      font-weight: 700;
      font-size: 1.5rem;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1rem;
      font-family: var(--font-serif);
      box-shadow: 0 4px 10px rgba(200,90,44,0.2);
    }

    .process-step h4 {
      font-size: 1rem;
      font-weight: 600;
      color: var(--dark);
      margin-bottom: 0.4rem;
    }

    .process-step p {
      font-size: 0.85rem;
      color: var(--muted);
    }

    .process-connector {
      width: 60px;
      height: 2px;
      background: repeating-linear-gradient(to right, var(--border) 0, var(--border) 6px, transparent 6px, transparent 12px);
      margin: 0 0.5rem;
      align-self: flex-start;
      margin-top: 26px;
    }

    /* 数据 */
    .data-item {
      text-align: center;
      padding: 1.5rem 1rem;
    }

    .data-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
      font-family: var(--font-serif);
      line-height: 1.1;
    }

    .data-unit {
      font-size: 1rem;
      color: var(--text);
      margin-left: 0.2rem;
    }

    .data-label {
      font-size: 0.9rem;
      color: var(--muted);
      margin-top: 0.5rem;
    }

    /* FAQ */
    .accordion-button {
      font-weight: 600;
      font-size: 1.05rem;
      color: var(--dark);
      background-color: var(--white);
      padding: 1.2rem 1.5rem;
      border: none;
      box-shadow: none;
      border-radius: var(--radius) !important;
      transition: var(--transition);
    }

    .accordion-button:not(.collapsed) {
      background-color: var(--white);
      color: var(--dark);
      border-bottom: 2px solid var(--primary);
      box-shadow: none;
    }

    .accordion-button::after {
      color: var(--primary);
      font-weight: bold;
    }

    .accordion-body {
      background-color: var(--light);
      padding: 1.2rem 1.5rem;
      font-size: 0.95rem;
      color: var(--text);
      line-height: 1.8;
      border-radius: 0 0 var(--radius) var(--radius);
    }

    .accordion-item {
      border: none;
      margin-bottom: 0.75rem;
      border-radius: var(--radius) !important;
      box-shadow: var(--shadow);
    }

    /* CTA */
    .cta-block {
      background-color: var(--dark);
      padding: 4rem 2rem;
      border-radius: var(--radius);
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .cta-block::before {
      content: '';
      position: absolute;
      width: 300px;
      height: 300px;
      background: radial-gradient(circle, rgba(232,163,23,0.15) 0%, transparent 70%);
      top: -50px;
      right: -50px;
      border-radius: 50%;
    }

    .cta-title {
      color: white;
      font-size: 2rem;
      font-weight: 700;
    }

    .cta-desc {
      color: rgba(255,255,255,0.75);
      max-width: 600px;
      margin: 0.8rem auto 1.8rem;
    }

    .btn-cta {
      background-color: var(--primary);
      border: none;
      color: white;
      font-weight: 700;
      padding: 0.8rem 2.5rem;
      font-size: 1.1rem;
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }

    .btn-cta:hover {
      background-color: var(--secondary);
      color: var(--dark);
      box-shadow: 0 6px 18px rgba(232,163,23,0.5);
      transform: scale(1.02);
    }

    /* Footer */
    footer {
      background-color: var(--dark);
      color: rgba(255,255,255,0.7);
      padding: 2rem 0;
    }

    .footer-brand {
      font-family: var(--font-serif);
      font-size: 1.3rem;
      color: white;
      font-weight: 600;
    }

    /* 响应式 */
    @media (max-width: 991.98px) {
      .hero-title {
        font-size: 2.4rem;
      }
      .process-connector {
        display: none;
      }
      .process-step {
        margin-bottom: 2rem;
      }
    }

    @media (max-width: 767.98px) {
      .hero-section {
        padding: 4rem 0 3rem;
        text-align: center;
      }
      .hero-title {
        font-size: 2rem;
      }
      .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
      }
      .section-title {
        font-size: 1.75rem;
      }
      .product-card .product-img {
        height: 180px;
      }
      .data-number {
        font-size: 2.2rem;
      }
      .cta-title {
        font-size: 1.6rem;
      }
    }