/* roulang page: index */
:root {
      --charcoal: #1C1C1E;
      --burgundy: #7B1E2A;
      --burgundy-dark: #5E1721;
      --champagne: #C9A96E;
      --warm-white: #FAF9F7;
      --warm-light: #F2EFEB;
      --text-primary: #3A3A3C;
      --text-secondary: #6C6C70;
      --border-light: #E5E3DE;
      --white: #FFFFFF;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-btn: 4px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --transition: 0.25s ease;
      --container-max: 1200px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: var(--warm-white);
      color: var(--text-primary);
      line-height: 1.6;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .inter {
      font-family: 'Inter', 'Noto Sans SC', sans-serif;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: var(--transition);
    }
    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 导航 */
    .top-brand-bar {
      background: var(--charcoal);
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 24px;
      color: var(--champagne);
      font-size: 13px;
      letter-spacing: 0.5px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      color: var(--white);
      font-size: 18px;
    }
    .brand-logo .diamond {
      width: 10px;
      height: 10px;
      background: var(--champagne);
      transform: rotate(45deg);
      display: inline-block;
    }
    .top-contact {
      display: flex;
      align-items: center;
      gap: 24px;
    }
    .main-nav {
      background: transparent;
      position: sticky;
      top: 0;
      z-index: 50;
      transition: background 0.3s, box-shadow 0.3s;
    }
    .main-nav.scrolled {
      background: var(--white);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--white);
      font-weight: 500;
      font-size: 15px;
      letter-spacing: 0.3px;
    }
    .main-nav.scrolled .nav-links a {
      color: var(--charcoal);
    }
    .nav-links a:hover {
      color: var(--champagne);
    }
    .btn-consult {
      background: var(--burgundy);
      color: var(--white);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      letter-spacing: 1px;
      font-size: 14px;
    }
    .btn-consult:hover {
      background: var(--burgundy-dark);
    }
    .hamburger {
      display: none;
      font-size: 24px;
      color: var(--white);
      background: none;
      border: none;
    }
    .main-nav.scrolled .hamburger {
      color: var(--charcoal);
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: var(--charcoal);
      z-index: 60;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 32px;
    }
    .mobile-menu a {
      color: var(--white);
      font-size: 20px;
      font-weight: 500;
    }
    .mobile-menu .close-menu {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 28px;
      color: var(--white);
    }
    /* Hero */
    .hero {
      background: var(--charcoal);
      position: relative;
      min-height: 85vh;
      display: flex;
      align-items: center;
      overflow: hidden;
    }
    .hero-bg {
      position: absolute;
      right: 0;
      top: 0;
      width: 45%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.3;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      width: 100%;
      padding: 80px 0;
    }
    .hero-left {
      width: 60%;
      padding-right: 40px;
    }
    .hero-left h1 {
      font-size: 52px;
      font-weight: 700;
      color: var(--white);
      line-height: 1.2;
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .hero-left h1::before {
      content: '';
      display: inline-block;
      width: 3px;
      height: 60px;
      background: var(--champagne);
      flex-shrink: 0;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin: 24px 0 32px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--burgundy);
      color: var(--white);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      letter-spacing: 1px;
    }
    .btn-primary:hover { background: var(--burgundy-dark); }
    .btn-ghost {
      border: 1.5px solid var(--white);
      color: var(--white);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      letter-spacing: 1px;
    }
    .btn-ghost:hover {
      background: var(--white);
      color: var(--charcoal);
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 38px;
      font-weight: 600;
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 40px;
      height: 3px;
      background: var(--burgundy);
      margin-top: 8px;
    }
    .bg-warm { background: var(--warm-light); }
    /* 优势 1+2 */
    .adv-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      margin-top: 48px;
    }
    .adv-main {
      background: var(--charcoal);
      color: var(--white);
      padding: 48px;
      border-radius: var(--radius-md);
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .adv-main h3 { font-size: 28px; margin-bottom: 16px; }
    .adv-stack {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .adv-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-light);
    }
    /* 业务交替 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-img {
      flex: 1;
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .service-img img {
      width: 100%;
      height: 320px;
      object-fit: cover;
      filter: grayscale(20%);
    }
    .service-text {
      flex: 1;
    }
    .link-underline {
      color: var(--burgundy);
      font-weight: 600;
      border-bottom: 2px solid var(--burgundy);
      padding-bottom: 2px;
    }
    /* 场景步骤 */
    .steps {
      display: flex;
      flex-direction: column;
      gap: 32px;
      margin-top: 40px;
      position: relative;
    }
    .step {
      display: flex;
      gap: 32px;
      align-items: flex-start;
    }
    .step-num {
      width: 48px;
      height: 48px;
      background: var(--champagne);
      color: var(--charcoal);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 20px;
      flex-shrink: 0;
    }
    /* 案例 */
    .stats {
      display: flex;
      justify-content: space-between;
      gap: 24px;
      margin: 40px 0;
    }
    .stat-item h4 {
      font-size: 44px;
      color: var(--burgundy);
      font-weight: 700;
    }
    .logo-wall {
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
      justify-content: center;
      margin-top: 32px;
    }
    .logo-wall img {
      width: 100px;
      height: 60px;
      object-fit: contain;
      filter: grayscale(100%);
      opacity: 0.7;
      transition: 0.2s;
    }
    .logo-wall img:hover {
      filter: none;
      opacity: 1;
    }
    /* 价格 */
    .pricing-grid {
      display: flex;
      gap: 24px;
      align-items: flex-end;
      margin-top: 40px;
    }
    .price-card {
      background: var(--white);
      padding: 40px 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      flex: 1;
      text-align: center;
    }
    .price-card.featured {
      border: 2px solid var(--burgundy);
      transform: scaleY(1.03);
      position: relative;
    }
    .badge {
      background: var(--champagne);
      color: var(--charcoal);
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 600;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 20px 0;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      background: none;
      border: none;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: var(--warm-light);
      padding: 0 16px;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 20px 16px;
    }
    /* CTA横幅 */
    .cta-banner {
      background: var(--charcoal);
      color: var(--white);
      text-align: center;
      padding: 80px 0;
    }
    /* 页脚 */
    footer {
      background: var(--charcoal);
      color: #9A9A9C;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr 1fr;
      gap: 32px;
    }
    @media (max-width: 1024px) {
      .hero-left { width: 100%; }
      .hero-bg { width: 100%; opacity: 0.15; }
      .nav-links { display: none; }
      .hamburger { display: block; }
      .adv-grid { grid-template-columns: 1fr; }
      .service-row, .service-row.reverse { flex-direction: column; }
      .pricing-grid { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .hero-left h1 { font-size: 36px; }
      section { padding: 60px 0; }
      .stats { flex-direction: column; }
    }