/* roulang page: index */
:root {
      --primary: #1A3C34;
      --primary-deep: #0F2923;
      --accent: #C9A96E;
      --accent-hover: #B08D4B;
      --bg-warm: #FBF9F6;
      --white: #FFFFFF;
      --text-dark: #1E2D2A;
      --text-body: #4A5B55;
      --text-light: #6F7E77;
      --border-light: rgba(26,60,52,0.08);
      --shadow-card: 0 4px 20px rgba(26,60,52,0.06);
      --shadow-card-hover: 0 8px 30px rgba(26,60,52,0.12);
      --radius-card: 8px;
      --radius-btn: 6px;
      --transition: all 0.3s ease;
      --serif: "Noto Serif SC", "思源宋体", serif;
      --sans: "Inter", "SF Pro Text", "PingFang SC", sans-serif;
      --container-max: 1280px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--sans);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.6;
      font-size: 16px;
      scroll-behavior: smooth;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      border-bottom: 1px solid var(--border-light);
      height: 72px;
      z-index: 100;
      display: flex;
      align-items: center;
      transition: box-shadow 0.3s;
    }
    .nav.scrolled {
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }
    .nav .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-family: var(--serif);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-icon {
      font-size: 2rem;
      color: var(--accent);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-dark);
      font-size: 0.95rem;
      position: relative;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.3s;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--primary);
      transition: var(--transition);
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.06);
      }
      .nav-links.open {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
    }
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: var(--bg-warm);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 6fr 5fr;
      gap: 60px;
      align-items: center;
    }
    .hero-title {
      font-family: var(--serif);
      font-size: 3.4rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-title span {
      color: var(--accent);
      font-weight: 900;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 32px;
      max-width: 90%;
    }
    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 380px;
      border-radius: 16px;
      position: relative;
      box-shadow: var(--shadow-card-hover);
    }
    .watermark-uk {
      position: absolute;
      right: -20px;
      bottom: -20px;
      opacity: 0.04;
      width: 280px;
      height: 280px;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 200"><path d="M100 20 L130 60 L170 60 L140 90 L150 130 L100 105 L50 130 L60 90 L30 60 L70 60 Z" fill="%231A3C34"/></svg>') no-repeat;
      background-size: contain;
      pointer-events: none;
    }
    @media (max-width: 992px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero-title {
        font-size: 2.8rem;
      }
    }
    @media (max-width: 520px) {
      .hero-title {
        font-size: 2rem;
      }
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-family: var(--serif);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-light);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }
    /* 核心优势 非对称 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .adv-item {
      display: flex;
      gap: 24px;
      align-items: flex-start;
    }
    .adv-icon {
      font-size: 2.2rem;
      color: var(--accent);
      background: rgba(201,169,110,0.1);
      width: 56px;
      height: 56px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 12px;
    }
    .adv-text h3 {
      font-family: var(--serif);
      color: var(--primary);
      font-size: 1.5rem;
      margin-bottom: 8px;
    }
    @media (max-width: 768px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 服务卡片 2x2 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--accent);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }
    .service-card h4 {
      font-family: var(--serif);
      color: var(--primary);
      font-size: 1.5rem;
      margin-bottom: 12px;
    }
    .service-card p {
      flex: 1;
      margin-bottom: 16px;
      color: var(--text-body);
    }
    .service-card a {
      color: var(--accent);
      font-weight: 600;
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 流程时间线 */
    .timeline {
      display: flex;
      justify-content: space-between;
      position: relative;
      margin-top: 40px;
    }
    .timeline::before {
      content: '';
      position: absolute;
      top: 28px;
      left: 5%;
      width: 90%;
      height: 2px;
      background: var(--accent);
      opacity: 0.4;
      z-index: 0;
    }
    .step {
      text-align: center;
      flex: 1;
      position: relative;
      z-index: 1;
    }
    .step-dot {
      width: 24px;
      height: 24px;
      background: var(--primary);
      border-radius: 50%;
      margin: 0 auto 16px;
      border: 3px solid var(--accent);
      transition: transform 0.3s;
    }
    .step:hover .step-dot {
      transform: scale(1.3);
      background: var(--accent);
    }
    .step h5 {
      font-family: var(--serif);
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .timeline {
        flex-direction: column;
        gap: 30px;
        align-items: flex-start;
      }
      .timeline::before {
        display: none;
      }
      .step {
        display: flex;
        gap: 16px;
        align-items: center;
      }
    }
    /* 案例数据 */
    .case-block {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .case-img {
      background: url('/assets/images/coverpic/cover-2.webp') center/cover no-repeat;
      min-height: 280px;
      border-radius: 12px;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent);
    }
    @media (max-width: 768px) {
      .case-block {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      color: var(--primary);
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* CTA 表单 */
    .cta-section {
      background: var(--primary);
      color: white;
      padding: 80px 0;
      text-align: center;
    }
    .cta-form {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      justify-content: center;
      margin-top: 32px;
    }
    .cta-form input, .cta-form textarea {
      padding: 14px 18px;
      border-radius: 6px;
      border: none;
      font-family: var(--sans);
      min-width: 220px;
    }
    .footer {
      background: #0F2923;
      color: rgba(255,255,255,0.8);
      padding: 48px 0 24px;
    }
    .footer a:hover {
      color: var(--accent);
    }