/* roulang page: index */
:root {
      --deep-charcoal: #1C1C1C;
      --champagne-gold: #C9A96E;
      --champagne-dark: #B08D4A;
      --warm-white: #FAF8F5;
      --soft-gray: #F3F1EC;
      --pure-white: #FFFFFF;
      --border-light: #E8E4DD;
      --text-primary: #1C1C1C;
      --text-secondary: #4A4A4A;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-sm: 4px;
      --radius-xs: 2px;
      --font-serif: 'Noto Serif SC', 'Times New Roman', '宋体', serif;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', 'Inter', system-ui, sans-serif;
      --section-gap: 120px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--text-primary);
      line-height: 1.8;
      font-size: 16px;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(250, 248, 245, 0.85);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-light);
      z-index: 40;
      transition: all 0.25s ease;
      height: 72px;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--champagne-gold);
      letter-spacing: 1px;
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.5rem;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--deep-charcoal);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }

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

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

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--champagne-gold);
    }

    .btn-nav {
      background: var(--champagne-gold);
      color: var(--deep-charcoal) !important;
      padding: 10px 26px !important;
      border-radius: var(--radius-xs);
      font-weight: 600 !important;
      font-size: 0.9rem;
      transition: all 0.25s ease;
      margin-left: 8px;
      border: none;
      cursor: pointer;
    }

    .btn-nav:hover {
      background: var(--champagne-dark);
      transform: scale(1.02);
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--deep-charcoal);
      cursor: pointer;
    }

    /* Hero */
    #hero {
      padding: 140px 0 100px;
      background: var(--warm-white);
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-text {
      flex: 1;
    }

    .hero-text h1 {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 48px;
      line-height: 1.25;
      color: var(--deep-charcoal);
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero-sub {
      font-size: 1.15rem;
      color: var(--text-secondary);
      margin-bottom: 36px;
      max-width: 480px;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--champagne-gold);
      color: var(--deep-charcoal);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-xs);
      border: none;
      display: inline-block;
      text-align: center;
      transition: all 0.25s ease;
      font-size: 1rem;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--champagne-dark);
      transform: scale(1.03);
      color: var(--deep-charcoal);
    }

    .btn-secondary {
      background: transparent;
      border: 1px solid var(--deep-charcoal);
      color: var(--deep-charcoal);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-xs);
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      font-size: 1rem;
    }

    .btn-secondary:hover {
      background: var(--deep-charcoal);
      color: var(--warm-white);
    }

    .hero-visual {
      flex: 1;
      position: relative;
      min-height: 360px;
      border-radius: var(--radius-sm);
      overflow: hidden;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      box-shadow: var(--shadow-sm);
    }

    .hero-visual::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(to right, rgba(28,28,28,0.45) 0%, rgba(28,28,28,0.1) 70%);
      z-index: 1;
    }

    .golden-line {
      position: absolute;
      top: 25%;
      right: 12%;
      width: 60px;
      height: 2px;
      background: var(--champagne-gold);
      z-index: 2;
    }

    .golden-line-vertical {
      position: absolute;
      bottom: 20%;
      left: 18%;
      width: 2px;
      height: 40px;
      background: var(--champagne-gold);
      z-index: 2;
    }

    /* 通用板块 */
    section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 36px;
      color: var(--deep-charcoal);
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }

    .section-desc {
      color: var(--text-secondary);
      max-width: 640px;
      margin-bottom: 48px;
      font-size: 1.05rem;
    }

    .bg-soft {
      background-color: var(--soft-gray);
    }

    /* 价值主张 */
    .value-grid {
      display: flex;
      gap: 40px;
      align-items: center;
      flex-wrap: wrap;
    }

    .value-text {
      flex: 1;
    }

    .value-img {
      flex: 1;
      background-image: url('/assets/images/coverpic/cover-2.webp');
      background-size: cover;
      background-position: center;
      min-height: 300px;
      border-radius: var(--radius-xs);
      position: relative;
    }

    .value-img::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(201,169,110,0.06);
    }

    /* 功能卡片 */
    .capabilities-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .cap-card {
      background: var(--pure-white);
      padding: 32px 24px;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

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

    .cap-icon {
      font-size: 2.2rem;
      color: var(--champagne-gold);
      margin-bottom: 20px;
    }

    .cap-card h3 {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.5rem;
      margin-bottom: 12px;
    }

    .cap-card p {
      color: var(--text-secondary);
      margin-bottom: 16px;
    }

    .text-link {
      color: var(--champagne-gold);
      font-weight: 500;
      transition: color 0.2s;
      cursor: pointer;
    }

    .text-link:hover {
      color: var(--champagne-dark);
      text-decoration: underline;
    }

    /* 场景交错 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-bottom: 60px;
      flex-wrap: wrap;
    }

    .scenario-img {
      flex: 1;
      min-height: 280px;
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-xs);
      position: relative;
    }

    .scenario-img::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(201,169,110,0.07);
    }

    .scenario-content {
      flex: 1;
    }

    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .case-card {
      background: var(--soft-gray);
      padding: 28px 22px;
      border-radius: var(--radius-sm);
      text-align: center;
    }

    .case-number {
      font-family: 'Inter', sans-serif;
      font-weight: 700;
      font-size: 2.8rem;
      color: var(--champagne-gold);
      margin-bottom: 8px;
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      text-align: center;
      flex-wrap: wrap;
      gap: 24px;
    }

    .step {
      flex: 1;
      min-width: 160px;
    }

    .step-icon {
      font-size: 2rem;
      color: var(--champagne-gold);
      margin-bottom: 12px;
    }

    /* FAQ */
    .accordion {
      max-width: 800px;
      margin: 0 auto;
    }

    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }

    .accordion-title {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-weight: 600;
      cursor: pointer;
      color: var(--deep-charcoal);
      font-size: 1.1rem;
    }

    .accordion-title i {
      transition: transform 0.3s ease;
      color: var(--champagne-gold);
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      padding-right: 30px;
    }

    .accordion-item.active .accordion-content {
      max-height: 200px;
      margin-top: 12px;
    }

    .accordion-item.active i {
      transform: rotate(180deg);
    }

    .decor-line {
      width: 2px;
      height: 20px;
      background: var(--champagne-gold);
      margin-right: 12px;
    }

    /* CTA */
    .cta-box {
      background: var(--deep-charcoal);
      color: var(--warm-white);
      padding: 60px 40px;
      border-radius: var(--radius-sm);
      text-align: center;
    }

    .cta-box h2 {
      color: white;
      font-family: var(--font-serif);
    }

    .input-line {
      display: flex;
      max-width: 420px;
      margin: 30px auto 0;
      border-bottom: 1px solid rgba(255,255,255,0.4);
    }

    .input-line input {
      background: transparent;
      border: none;
      padding: 12px 8px;
      flex: 1;
      color: white;
      outline: none;
    }

    .input-line input:focus {
      border-color: var(--champagne-gold);
    }

    .input-line button {
      background: var(--champagne-gold);
      border: none;
      color: var(--deep-charcoal);
      font-weight: 600;
      padding: 10px 24px;
      cursor: pointer;
    }

    /* Footer */
    .footer {
      background: var(--deep-charcoal);
      color: #ddd;
      padding: 60px 0 30px;
    }

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

    .footer a {
      color: #ccc;
      font-size: 0.95rem;
    }

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

    @media (max-width: 1024px) {
      .nav-links {
        gap: 1.8rem;
      }
      .hero-grid {
        flex-direction: column;
      }
      .capabilities-grid,
      .cases-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .hamburger {
        display: block;
      }
      .nav-links {
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(250,248,245,0.98);
        flex-direction: column;
        padding: 20px;
        gap: 16px;
        display: none;
        backdrop-filter: blur(12px);
      }
      .nav-links.open {
        display: flex;
      }

      .hero-text h1 {
        font-size: 36px;
      }
      .capabilities-grid,
      .cases-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 520px) {
      .hero-text h1 {
        font-size: 32px;
      }
      .btn-primary, .btn-secondary {
        width: 100%;
        text-align: center;
      }
    }

    .fade-in-up {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    }
    .fade-in-up.visible {
      opacity: 1;
      transform: translateY(0);
    }