/* roulang page: index */
:root {
      --deep-black: #1A1A1A;
      --champagne-gold: #C8A96E;
      --warm-white: #F5F0E8;
      --light-champagne: #E8D5B7;
      --dark-gray: #4A4A4A;
      --medium-gray: #666666;
      --light-gray: #999999;
      --border-light: rgba(0,0,0,0.06);
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 8px;
      --radius-btn: 50px;
      --transition-base: 0.25s ease;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: var(--font-sans);
      font-weight: 400;
      font-size: 16px;
      line-height: 1.7;
      color: var(--dark-gray);
      background-color: #FFFFFF;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      color: var(--deep-black);
      margin: 0;
    }

    h1 {
      font-weight: 700;
      font-size: 52px;
      line-height: 1.2;
      letter-spacing: -0.02em;
    }

    h2 {
      font-weight: 600;
      font-size: 38px;
      line-height: 1.25;
      letter-spacing: -0.01em;
    }

    h3 {
      font-family: var(--font-sans);
      font-weight: 600;
      font-size: 24px;
      line-height: 1.35;
    }

    h4 {
      font-family: var(--font-sans);
      font-weight: 600;
      font-size: 20px;
      line-height: 1.4;
    }

    p {
      margin-bottom: 1rem;
      color: var(--dark-gray);
    }

    a {
      color: var(--champagne-gold);
      text-decoration: none;
      transition: color var(--transition-base);
    }

    a:hover {
      color: #b8934f;
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 5%;
    }

    .section {
      padding: 100px 0;
    }

    @media (max-width: 640px) {
      .section {
        padding: 80px 0;
      }
      h1 {
        font-size: 36px;
      }
      h2 {
        font-size: 28px;
      }
      h3 {
        font-size: 20px;
      }
      h4 {
        font-size: 18px;
      }
    }

    /* 导航 */
    .top-nav {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      height: 64px;
      display: flex;
      align-items: center;
      position: fixed;
      width: 100%;
      top: 0;
      z-index: 100;
      border-bottom: 1px solid rgba(0,0,0,0.04);
    }

    .nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      padding: 0 5%;
      max-width: 1200px;
      margin: 0 auto;
    }

    .logo {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 22px;
      color: var(--deep-black);
      letter-spacing: 0.02em;
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--dark-gray);
      text-decoration: none;
      transition: color var(--transition-base);
    }

    .nav-links a:hover {
      color: var(--champagne-gold);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .search-icon {
      font-size: 18px;
      color: var(--dark-gray);
      cursor: pointer;
      transition: color var(--transition-base);
      background: none;
      border: none;
    }

    .search-icon:hover {
      color: var(--champagne-gold);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      font-size: 14px;
      letter-spacing: 0.04em;
      text-decoration: none;
      transition: all var(--transition-base);
      cursor: pointer;
      border: 2px solid transparent;
      height: 44px;
    }

    .btn-primary {
      background: var(--champagne-gold);
      color: #1A1A1A;
      border-color: var(--champagne-gold);
    }

    .btn-primary:hover {
      background: #b8934f;
      border-color: #b8934f;
      color: #1A1A1A;
      transform: scale(1.03);
      box-shadow: 0 4px 12px rgba(200,169,110,0.3);
    }

    .btn-outline {
      background: transparent;
      color: var(--champagne-gold);
      border-color: var(--champagne-gold);
    }

    .btn-outline:hover {
      background: rgba(200,169,110,0.08);
      transform: scale(1.03);
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--deep-black);
      cursor: pointer;
    }

    @media (max-width: 768px) {
      .nav-links, .nav-actions .search-icon, .nav-actions .btn {
        display: none;
      }
      .hamburger {
        display: block;
      }
    }

    /* hero */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 80px;
      min-height: 90vh;
      padding-top: 100px;
    }

    .hero-left {
      flex: 1 1 55%;
    }

    .hero-right {
      flex: 1 1 45%;
    }

    .hero-right img {
      border-radius: 12px;
      box-shadow: var(--shadow-md);
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      margin-top: 32px;
    }

    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        gap: 40px;
        padding-top: 120px;
      }
      .hero-right {
        order: -1;
      }
    }

    /* 板块通用 */
    .section-title {
      margin-bottom: 16px;
    }

    .section-desc {
      font-size: 18px;
      color: var(--medium-gray);
      max-width: 600px;
    }

    /* 痛点 */
    .pain-grid {
      display: flex;
      gap: 32px;
      margin-top: 48px;
    }

    .pain-card {
      background: #FFFFFF;
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      border-left: 4px solid var(--champagne-gold);
      flex: 1;
    }

    .pain-card.large {
      flex: 1.8;
    }

    .pain-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
      border-left: 4px solid var(--champagne-gold);
      border: 1px solid var(--champagne-gold);
      border-left: 4px solid var(--champagne-gold);
    }

    .pain-icon {
      font-size: 28px;
      color: var(--champagne-gold);
      margin-bottom: 16px;
    }

    @media (max-width: 768px) {
      .pain-grid {
        flex-direction: column;
      }
    }

    /* 解决方案 */
    .solution-layout {
      display: flex;
      gap: 60px;
      align-items: center;
      margin-top: 48px;
    }

    .solution-left {
      flex: 0 0 40%;
    }

    .solution-right {
      flex: 1;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .feature-item {
      padding: 16px 0;
      border-bottom: 1px solid rgba(0,0,0,0.08);
    }

    .feature-icon {
      color: var(--champagne-gold);
      font-size: 24px;
      margin-bottom: 8px;
    }

    @media (max-width: 768px) {
      .solution-layout {
        flex-direction: column;
      }
      .solution-right {
        grid-template-columns: 1fr;
      }
    }

    /* 成果深色条 */
    .dark-band {
      background: #2C2416;
      padding: 80px 0;
      color: #FFFFFF;
    }

    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      margin-bottom: 48px;
    }

    .stat-number {
      font-size: 52px;
      font-weight: 700;
      font-family: var(--font-serif);
      color: #FFFFFF;
      line-height: 1.1;
    }

    .stat-label {
      font-size: 16px;
      color: rgba(255,255,255,0.7);
      margin-top: 8px;
    }

    .case-cards {
      display: flex;
      gap: 32px;
    }

    .case-card {
      background: #1A1A1A;
      border-radius: var(--radius-card);
      overflow: hidden;
      flex: 1;
    }

    .case-card img {
      width: 100%;
      height: 240px;
      object-fit: cover;
    }

    .case-info {
      padding: 20px;
      color: #fff;
    }

    @media (max-width: 768px) {
      .stats-grid {
        flex-wrap: wrap;
        gap: 24px;
      }
      .case-cards {
        flex-direction: column;
      }
    }

    /* 证言 */
    .testimonial-grid {
      display: flex;
      gap: 32px;
      margin-top: 48px;
    }

    .testimonial-card {
      background: #F5F0E8;
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
      flex: 1;
    }

    .testimonial-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .quote-icon {
      font-size: 32px;
      color: var(--champagne-gold);
      margin-bottom: 16px;
    }

    .testimonial-text {
      font-style: italic;
      color: var(--dark-gray);
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 20px;
    }

    .testimonial-author img {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      object-fit: cover;
    }

    @media (max-width: 768px) {
      .testimonial-grid {
        flex-direction: column;
      }
    }

    /* FAQ */
    .accordion-faq {
      margin-top: 40px;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }

    .faq-question {
      padding: 20px 0;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color 0.2s;
    }

    .faq-question:hover {
      color: var(--champagne-gold);
    }

    .faq-icon {
      font-size: 20px;
      transition: transform 0.3s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--dark-gray);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA */
    .cta-band {
      background: #1A1A1A;
      padding: 100px 0;
      text-align: center;
      color: #FFFFFF;
    }

    .cta-band h2 {
      color: #FFFFFF;
    }

    .trust-badges {
      display: flex;
      justify-content: center;
      gap: 40px;
      margin-top: 40px;
      color: rgba(255,255,255,0.7);
    }

    /* 页脚 */
    .footer {
      background: #0D0D0D;
      color: #999;
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: var(--champagne-gold);
      font-family: var(--font-sans);
      font-weight: 600;
      font-size: 16px;
      margin-bottom: 20px;
    }

    .footer-links a {
      display: block;
      color: #999;
      font-size: 14px;
      margin-bottom: 12px;
      position: relative;
      transition: color 0.2s;
    }

    .footer-links a:hover {
      color: var(--champagne-gold);
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.08);
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 动画 */
    .fade-in-up {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    }
    .fade-in-up.visible {
      opacity: 1;
      transform: translateY(0);
    }
    .fade-in-right {
      opacity: 0;
      transform: translateX(30px);
      transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    }
    .fade-in-right.visible {
      opacity: 1;
      transform: translateX(0);
    }
    .scale-in {
      opacity: 0;
      transform: scale(0.95);
      transition: opacity 0.5s ease, transform 0.5s ease;
    }
    .scale-in.visible {
      opacity: 1;
      transform: scale(1);
    }

    .pulse {
      animation: pulse 3s infinite;
    }

    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(200,169,110,0.4); }
      70% { box-shadow: 0 0 0 12px rgba(200,169,110,0); }
      100% { box-shadow: 0 0 0 0 rgba(200,169,110,0); }
    }