/* roulang page: index */
:root {
      --deep-charcoal: #1E2D2F;
      --amber-accent: #D49B3B;
      --amber-hover: #B8832E;
      --warm-white: #FAF8F5;
      --soft-mint: #EDF1F0;
      --text-primary: #1A1A1A;
      --text-secondary: #5C6362;
      --text-light: #F5F3EE;
      --border-light: #E8E5E0;
      --success-green: #2D7D5F;
      --alert-red: #C2543D;
      --card-shadow: 0 2px 12px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --border-radius-card: 12px;
      --border-radius-inner: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-mono: "Inter", "SF Pro Display", system-ui;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--text-primary);
      margin: 0;
      padding: 0;
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: var(--amber-accent);
      text-decoration: none;
      transition: all 0.2s ease;
    }

    a:hover {
      text-decoration: underline;
      text-decoration-style: solid;
      text-underline-offset: 2px;
    }

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

    h1, h2, h3, h4 {
      font-weight: 600;
      letter-spacing: -0.01em;
    }

    h1 {
      font-size: 2.8rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--deep-charcoal);
      line-height: 1.2;
    }

    h2 {
      font-size: 2.2rem;
      font-weight: 600;
      color: var(--deep-charcoal);
      margin-bottom: 1.5rem;
    }

    h3 {
      font-size: 1.4rem;
      font-weight: 600;
      color: var(--deep-charcoal);
    }

    .text-secondary {
      color: var(--text-secondary) !important;
    }

    .badge-custom {
      background-color: var(--border-light);
      color: var(--text-secondary);
      font-size: 0.75rem;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      font-weight: 500;
      letter-spacing: 0.04em;
    }

    /* 按钮系统 */
    .btn-primary-custom {
      background-color: var(--amber-accent);
      border: none;
      color: white;
      font-weight: 600;
      border-radius: var(--border-radius-inner);
      padding: 0.75rem 1.8rem;
      transition: all 0.2s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      box-shadow: 0 4px 10px rgba(212, 155, 59, 0.2);
      display: inline-block;
      text-align: center;
    }

    .btn-primary-custom:hover {
      background-color: var(--amber-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(212, 155, 59, 0.35);
      color: white;
    }

    .btn-outline-custom {
      border: 2px solid var(--deep-charcoal);
      color: var(--deep-charcoal);
      background: transparent;
      font-weight: 600;
      border-radius: var(--border-radius-inner);
      padding: 0.65rem 1.8rem;
      transition: 0.2s ease;
    }

    .btn-outline-custom:hover {
      background-color: var(--deep-charcoal);
      color: var(--text-light);
      border-color: var(--deep-charcoal);
    }

    .btn-lg-custom {
      padding: 1rem 2.5rem;
      font-size: 1.1rem;
    }

    /* 导航栏 */
    .navbar {
      background: rgba(250, 248, 245, 0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      padding: 0.75rem 0;
      transition: all 0.3s;
    }

    .navbar-brand {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--deep-charcoal) !important;
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
    }

    .logo-icon {
      display: inline-block;
      width: 28px;
      height: 28px;
      background: var(--amber-accent);
      clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
      margin-right: 8px;
      position: relative;
    }

    .logo-icon::after {
      content: "";
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 0;
      height: 0;
      border-left: 6px solid transparent;
      border-right: 6px solid transparent;
      border-bottom: 8px solid white;
    }

    .nav-link {
      color: var(--text-secondary) !important;
      font-weight: 500;
      margin: 0 0.4rem;
      transition: 0.2s;
      position: relative;
      font-size: 0.95rem;
    }

    .nav-link:hover {
      color: var(--deep-charcoal) !important;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--amber-accent);
      transition: width 0.2s;
    }

    .nav-link:hover::after {
      width: 100%;
    }

    .mega-trigger {
      cursor: pointer;
      color: var(--deep-charcoal);
      font-weight: 500;
      margin-left: 1rem;
    }

    .mega-panel {
      display: none;
      position: absolute;
      top: 72px;
      right: 0;
      width: 100%;
      max-width: 700px;
      background: white;
      border-radius: 0 0 16px 16px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.08);
      padding: 2rem;
      z-index: 1050;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 1.5rem;
    }

    .mega-trigger:hover .mega-panel,
    .mega-panel:hover {
      display: grid;
    }

    @media (max-width: 992px) {
      .mega-panel {
        max-width: 100%;
        left: 0;
        grid-template-columns: 1fr;
        position: static;
        box-shadow: none;
        padding: 1rem;
      }
    }

    /* Hero 区 */
    .hero-section {
      padding: 160px 0 100px;
      background-color: var(--warm-white);
      background-image: radial-gradient(circle at 10% 20%, rgba(212,155,59,0.02) 0%, transparent 35%);
      position: relative;
      overflow: hidden;
    }

    .hero-image {
      border-radius: 16px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.1);
      transition: transform 0.3s;
    }

    .hero-image:hover {
      transform: scale(1.01);
    }

    /* 卡片样式 */
    .service-card {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--border-radius-card);
      box-shadow: var(--card-shadow);
      transition: all 0.25s ease;
      overflow: hidden;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
    }

    .service-card img {
      height: 180px;
      object-fit: cover;
      border-radius: var(--border-radius-card) var(--border-radius-card) 0 0;
    }

    .card-body-custom {
      padding: 1.8rem;
    }

    .advantage-block {
      background: var(--soft-mint);
      border-radius: 16px;
      padding: 2.5rem;
    }

    .stat-number {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 2.8rem;
      color: var(--amber-accent);
    }

    .case-card {
      background: white;
      border-left: 3px solid transparent;
      transition: 0.2s;
    }

    .case-card:hover {
      border-left-color: var(--amber-accent);
      background: #fdfdfd;
    }

    .process-step {
      text-align: center;
      position: relative;
    }

    .step-circle {
      width: 60px;
      height: 60px;
      background: var(--amber-accent);
      color: white;
      font-weight: 700;
      font-size: 1.5rem;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1rem;
    }

    .faq-accordion .accordion-button {
      background: var(--warm-white);
      border-bottom: 1px solid var(--border-light);
      font-weight: 600;
      color: var(--deep-charcoal);
      box-shadow: none;
    }

    .faq-accordion .accordion-button:not(.collapsed) {
      background: white;
      border-left: 4px solid var(--amber-accent);
    }

    .cta-section {
      background: var(--deep-charcoal);
      color: var(--text-light);
      padding: 4rem 0;
      position: relative;
    }

    .footer {
      background: var(--deep-charcoal);
      color: #A8B0AF;
      padding: 3rem 0 1.5rem;
    }

    .footer a {
      color: #A8B0AF;
    }

    .footer a:hover {
      color: var(--text-light);
    }

    @media (max-width: 768px) {
      h1 {
        font-size: 2rem;
      }
      .hero-section {
        padding: 120px 0 60px;
      }
    }