/* roulang page: index */
/* 设计变量与重置 */
    :root {
      --charcoal: #1E1E1E;
      --wine: #800020;
      --wine-deep: #5C0018;
      --champagne: #C9A96E;
      --bg-warm: #F5F0EB;
      --ivory: #FFFAF5;
      --gray-light: #6B6B6B;
      --gray-border: #E0DCD7;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.3s ease;
      --font-sans: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      --container-max: 1280px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--charcoal);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, input, textarea {
      font-family: inherit;
      font-size: 1rem;
      outline: none;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    /* 导航 */
    #main-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 250, 245, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--gray-border);
      height: 72px;
      display: flex;
      align-items: center;
      z-index: 1000;
      transition: box-shadow var(--transition);
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
    }
    #main-nav.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--wine);
      letter-spacing: -0.3px;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--charcoal);
      position: relative;
      padding: 0.25rem 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--wine);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-login {
      background: var(--wine);
      color: white !important;
      padding: 10px 24px !important;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 10px rgba(128,0,32,0.2);
      transition: background 0.2s, transform 0.2s;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .btn-login:hover {
      background: var(--wine-deep);
      transform: translateY(-1px);
    }
    .btn-login i {
      font-size: 0.9rem;
    }
    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: white;
      border-top: 1px solid var(--gray-border);
      justify-content: space-around;
      align-items: center;
      height: 64px;
      z-index: 1000;
      box-shadow: 0 -4px 12px rgba(0,0,0,0.04);
    }
    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      color: var(--gray-light);
      gap: 4px;
    }
    .mobile-nav a i {
      font-size: 1.2rem;
    }
    .mobile-nav .login-fab {
      background: var(--wine);
      color: white;
      width: 48px;
      height: 48px;
      border-radius: 30px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-top: -20px;
      box-shadow: 0 6px 16px rgba(128,0,32,0.3);
      font-size: 1.2rem;
    }
    @media (max-width: 768px) {
      #main-nav .nav-links {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      body {
        padding-bottom: 70px;
      }
    }
    /* Hero 双栏 */
    #hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      padding-top: 72px;
      background: linear-gradient(90deg, var(--bg-warm) 50%, rgba(245,240,235,0.7) 100%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 3rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
      color: var(--charcoal);
      margin-bottom: 1.5rem;
    }
    .hero-content .subtitle {
      font-size: 1.1rem;
      color: var(--gray-light);
      margin-bottom: 2rem;
      max-width: 90%;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--wine);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 6px 16px rgba(128,0,32,0.24);
      transition: background 0.2s, transform 0.2s;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: var(--wine-deep);
      transform: translateY(-2px);
    }
    .btn-outline {
      border: 1.5px solid var(--champagne);
      background: transparent;
      color: var(--charcoal);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s;
      display: inline-flex;
      align-items: center;
    }
    .btn-outline:hover {
      background: rgba(201,169,110,0.08);
      border-color: var(--wine);
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      height: 500px;
      width: 100%;
      box-shadow: 0 20px 40px rgba(0,0,0,0.12);
      position: relative;
      overflow: hidden;
    }
    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(128,0,32,0.08) 0%, transparent 60%);
    }
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
      }
      .hero-image {
        height: 350px;
        order: -1;
      }
    }
    @media (max-width: 768px) {
      #hero {
        min-height: auto;
        padding: 100px 0 60px;
      }
      .hero-content h1 {
        font-size: 2rem;
      }
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 600;
      letter-spacing: -0.3px;
      margin-bottom: 1rem;
      color: var(--charcoal);
    }
    .section-desc {
      color: var(--gray-light);
      max-width: 600px;
      margin-bottom: 3rem;
    }
    /* 核心优势网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .feature-card {
      background: var(--ivory);
      padding: 2rem;
      border-radius: var(--radius-card);
      border: 1px solid rgba(0,0,0,0.04);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 2.5rem;
      color: var(--champagne);
      margin-bottom: 1.5rem;
    }
    .feature-card h3 {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
    }
    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 案例瀑布 */
    .showcase-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 2rem;
    }
    .showcase-card {
      background: var(--ivory);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .showcase-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .showcase-card img {
      width: 100%;
      height: 240px;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .showcase-card:hover img {
      transform: scale(1.03);
    }
    .showcase-info {
      padding: 1.5rem;
    }
    .tag {
      color: var(--wine);
      font-weight: 600;
      font-size: 0.8rem;
      letter-spacing: 0.5px;
    }
    /* 流程对比 */
    .process-compare {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
    }
    .compare-box {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      border: 1px solid var(--gray-border);
    }
    .compare-box h4 {
      font-size: 1.3rem;
      margin-bottom: 1.5rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .list-item {
      display: flex;
      align-items: center;
      gap: 0.8rem;
      margin-bottom: 1rem;
      color: var(--charcoal);
    }
    @media (max-width: 768px) {
      .process-compare {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-item {
      background: var(--ivory);
      border: 1px solid rgba(0,0,0,0.04);
      border-radius: var(--radius-card);
      margin-bottom: 1rem;
      overflow: hidden;
    }
    .faq-question {
      padding: 1.25rem 1.5rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: transparent;
      border: none;
      width: 100%;
      text-align: left;
      font-size: 1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 1.5rem;
    }
    .faq-answer.open {
      max-height: 200px;
      padding-bottom: 1.5rem;
    }
    /* 表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      background: white;
      border-radius: 24px;
      padding: 3rem;
      box-shadow: var(--shadow-sm);
    }
    .form-input {
      width: 100%;
      padding: 14px 16px;
      border: 1px solid #ddd;
      border-radius: 6px;
      margin-bottom: 1.2rem;
      transition: border 0.2s;
    }
    .form-input:focus {
      border-color: var(--wine);
    }
    @media (max-width: 768px) {
      .contact-grid {
        grid-template-columns: 1fr;
        padding: 1.5rem;
      }
    }
    footer {
      background: var(--charcoal);
      color: #ccc;
      padding: 3rem 0;
    }
    .footer-content {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
    }
    .footer-links a {
      margin-left: 1.5rem;
      color: #aaa;
    }