/* roulang page: index */
:root {
      --primary-black: #1A1A1A;
      --accent-gold: #C8A96E;
      --bg-warm: #FAFAF7;
      --card-bg: #FFFFFF;
      --border-light: #E8E5DF;
      --text-body: #3D3D3A;
      --text-muted: #787872;
      --text-on-dark: #F0EDE6;
      --dark-bg: #1E1E1C;
      --success-green: #4A6B5C;
      --alert-red: #C44B3C;
      --gold-hover: #B8995A;
      --gold-light: #D4B87A;
      --radius-card: 4px;
      --radius-btn: 2px;
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.06);
      --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
      --transition-smooth: 0.25s ease;
      --header-height: 70px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      background: var(--bg-warm);
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
      padding-top: var(--header-height);
    }
    .grid-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .section-padding {
      padding: 80px 0;
    }
    @media (max-width: 1024px) {
      .section-padding {
        padding: 48px 0;
      }
    }
    h1, h2, h3, h4 {
      font-family: var(--font-sans);
      color: var(--primary-black);
      font-weight: 600;
      letter-spacing: -0.01em;
    }
    h1 {
      font-size: 56px;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.15;
    }
    h2 {
      font-size: 40px;
      font-weight: 600;
      margin-bottom: 24px;
    }
    h3 {
      font-size: 24px;
      font-weight: 600;
    }
    h4 {
      font-size: 20px;
      font-weight: 500;
    }
    p, li {
      color: var(--text-body);
    }
    .text-muted {
      color: var(--text-muted);
    }
    a {
      color: var(--accent-gold);
      text-decoration: none;
      transition: color 0.2s;
    }
    a:hover {
      color: var(--gold-hover);
    }
    img {
      display: block;
      max-width: 100%;
      height: auto;
    }
    /* 导航栏 */
    #main-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: transparent;
      transition: background 0.3s, box-shadow 0.3s, backdrop-filter 0.3s;
      height: var(--header-height);
      display: flex;
      align-items: center;
      border-bottom: 1px solid transparent;
    }
    #main-nav.scrolled {
      background: rgba(250,250,247,0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }
    .nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary-black);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 0.5px;
    }
    .logo-diamond {
      display: inline-block;
      width: 8px;
      height: 8px;
      background: var(--accent-gold);
      transform: rotate(45deg);
      margin-left: 2px;
    }
    .nav-links {
      display: flex;
      gap: 40px;
      align-items: center;
    }
    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
      text-decoration: none;
      letter-spacing: 0.3px;
    }
    .nav-links a:hover {
      color: var(--accent-gold);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 60%;
      height: 2px;
      background: var(--accent-gold);
      border-radius: 2px;
    }
    .menu-icon {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
    }
    .menu-icon span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--primary-black);
      transition: 0.2s;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: var(--bg-warm);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 32px;
        z-index: 99;
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        font-size: 20px;
        font-weight: 500;
      }
      .menu-icon {
        display: flex;
        z-index: 101;
      }
    }
    /* 按钮 */
    .btn {
      display: inline-block;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      text-align: center;
      transition: all var(--transition-smooth);
      cursor: pointer;
      font-size: 15px;
      letter-spacing: 0.3px;
      border: 1px solid transparent;
      background: transparent;
      color: var(--primary-black);
      text-decoration: none;
    }
    .btn-primary {
      background: var(--accent-gold);
      color: var(--primary-black);
      border-color: var(--accent-gold);
    }
    .btn-primary:hover {
      background: var(--gold-hover);
      border-color: var(--gold-hover);
      transform: translateY(-2px);
      color: var(--primary-black);
    }
    .btn-outline {
      border: 1px solid var(--primary-black);
      background: transparent;
      color: var(--primary-black);
    }
    .btn-outline:hover {
      background: var(--primary-black);
      color: var(--bg-warm);
      transform: translateY(-2px);
    }
    .btn-light {
      background: var(--accent-gold);
      color: var(--primary-black);
      border-color: var(--accent-gold);
    }
    .btn-light:hover {
      background: var(--gold-light);
      border-color: var(--gold-light);
      transform: translateY(-2px);
    }
    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 40px;
      align-items: center;
      min-height: 80vh;
    }
    .hero-left h1 {
      color: var(--primary-black);
      margin-bottom: 20px;
    }
    .hero-left h1 .gold-text {
      color: var(--accent-gold);
      display: block;
    }
    .hero-sub {
      font-size: 17px;
      color: var(--text-muted);
      max-width: 420px;
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-cta {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-right img {
      width: 100%;
      border-radius: 4px;
      object-fit: cover;
      aspect-ratio: 4/3;
      background: #E8E5DF;
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .hero-right {
        order: -1;
      }
      h1 {
        font-size: 40px;
      }
    }
    /* 卡片网格 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      padding: 32px;
      border-radius: var(--radius-card);
      transition: all var(--transition-smooth);
    }
    .adv-card:hover {
      border-color: var(--accent-gold);
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }
    .adv-icon {
      color: var(--accent-gold);
      font-size: 24px;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
    }
    .adv-card h3 {
      font-size: 18px;
      margin-bottom: 8px;
    }
    .brand-manifesto {
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 32px 0;
    }
    .brand-manifesto h2 {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .gold-line {
      width: 40px;
      height: 2px;
      background: var(--accent-gold);
      margin: 16px 0;
    }
    @media (max-width: 768px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 服务瀑布 */
    .services-masonry {
      column-count: 3;
      column-gap: 24px;
    }
    .service-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: transparent;
      border-radius: 4px;
    }
    .service-card img {
      width: 100%;
      border-radius: 4px;
      object-fit: cover;
      background: #E8E5DF;
      transition: transform 0.3s ease;
    }
    .service-card:hover img {
      transform: scale(1.02);
    }
    .service-tag {
      display: inline-block;
      font-size: 11px;
      letter-spacing: 0.08em;
      color: var(--accent-gold);
      background: #F5F2EB;
      padding: 4px 8px;
      border-radius: 2px;
      margin: 12px 0 8px;
      text-transform: uppercase;
    }
    .service-card h3 {
      font-size: 18px;
      margin-bottom: 4px;
    }
    @media (max-width: 1024px) {
      .services-masonry {
        column-count: 2;
      }
    }
    @media (max-width: 640px) {
      .services-masonry {
        column-count: 1;
      }
    }
    /* 对比 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 4fr 1fr 4fr;
      gap: 24px;
      align-items: center;
    }
    .compare-card {
      background: var(--bg-warm);
      border: 1px solid var(--border-light);
      padding: 40px;
      border-radius: var(--radius-card);
    }
    .vs-col {
      text-align: center;
      font-size: 28px;
      font-weight: 700;
      color: var(--accent-gold);
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }
    .vs-line {
      width: 1px;
      height: 40px;
      background: var(--accent-gold);
      opacity: 0.4;
    }
    .compare-list {
      list-style: none;
      margin: 24px 0;
    }
    .compare-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .check { color: var(--success-green); font-weight: 600; }
    .cross { color: var(--alert-red); font-weight: 600; }
    @media (max-width: 768px) {
      .compare-wrapper {
        grid-template-columns: 1fr;
      }
    }
    /* 数据 */
    .trust-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .trust-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-gold);
    }
    .trust-unit {
      font-size: 20px;
      font-weight: 500;
      color: var(--text-body);
    }
    @media (max-width: 640px) {
      .trust-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    /* FAQ */
    .faq-list {
      max-width: 720px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      display: flex;
      gap: 24px;
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-number {
      font-size: 48px;
      font-weight: 700;
      color: #F0EDE6;
      line-height: 1;
      width: 60px;
      transition: color 0.3s;
    }
    .faq-item.active .faq-number {
      color: var(--accent-gold);
    }
    .faq-content h4 {
      margin-bottom: 8px;
      font-size: 16px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    /* 联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
    }
    .footer-form input {
      background: transparent;
      border: none;
      border-bottom: 1px solid #4A4A45;
      color: var(--text-on-dark);
      padding: 12px 4px;
      width: 100%;
      margin-bottom: 20px;
      outline: none;
      transition: border 0.2s;
    }
    .footer-form input:focus {
      border-bottom-color: var(--accent-gold);
    }
    .footer-bottom {
      border-top: 1px solid #3A3A35;
      margin-top: 40px;
      padding-top: 20px;
      font-size: 12px;
      color: #6B6B63;
      text-align: center;
    }
    @media (max-width: 768px) {
      .contact-grid {
        grid-template-columns: 1fr;
      }
    }