/* roulang page: index */
:root {
      --brand-deep: #1A3C34;
      --brand-mist: #E5E9E7;
      --accent-amber: #E87A2A;
      --text-charcoal: #1E1E1E;
      --text-rock: #5A5E5C;
      --card-bg: #F4F6F5;
      --card-border: #E0E4E2;
      --hover-amber: #C96A1E;
      --white-soft: #FFFFFF;
      --deep-cta-bg: #152E28;
      --radius-lg: 12px;
      --radius-md: 8px;
      --radius-sm: 6px;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(26,60,52,0.10);
      --transition-base: 0.25s ease;
      --transition-smooth: 0.35s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--brand-mist);
      color: var(--text-charcoal);
      line-height: 1.75;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-base);
    }
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 悬浮胶囊导航 */
    .nav-capsule {
      position: fixed;
      top: 24px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 95%;
      background: rgba(244,246,245,0.88);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-radius: 40px;
      padding: 8px 28px;
      z-index: 999;
      box-shadow: 0 10px 25px rgba(0,0,0,0.06);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 32px;
      transition: all var(--transition-smooth);
    }
    .nav-capsule.scrolled {
      box-shadow: 0 12px 28px rgba(0,0,0,0.10);
      background: rgba(244,246,245,0.95);
    }
    .nav-brand {
      font-weight: 700;
      font-size: 1.4rem;
      letter-spacing: -0.02em;
      color: var(--brand-deep);
      white-space: nowrap;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .nav-brand i {
      color: var(--accent-amber);
      font-size: 1.5rem;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
      list-style: none;
      margin: 0;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-rock);
      padding: 6px 2px;
      position: relative;
      transition: color var(--transition-base);
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--text-charcoal);
    }
    .nav-links a.active {
      color: var(--brand-deep);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--accent-amber);
      border-radius: 2px;
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--brand-deep);
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-capsule {
        width: 92%;
        padding: 8px 20px;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 5%;
        width: 90%;
        background: rgba(255,255,255,0.96);
        backdrop-filter: blur(20px);
        border-radius: 30px;
        flex-direction: column;
        gap: 18px;
        padding: 24px;
        box-shadow: 0 20px 30px rgba(0,0,0,0.08);
      }
      .nav-links.active-mobile {
        display: flex;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-brand {
        font-size: 1.2rem;
      }
    }
    /* Hero 双栏 */
    .hero-section {
      padding: 160px 0 100px;
      background-color: var(--brand-mist);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 50px;
    }
    .hero-left {
      flex: 1 1 50%;
    }
    .hero-right {
      flex: 1 1 50%;
      position: relative;
    }
    .hero-right .image-wrapper {
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 0 20px 35px rgba(0,0,0,0.08);
      position: relative;
    }
    .hero-right img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .hero-right::before {
      content: '';
      position: absolute;
      width: 180px;
      height: 180px;
      background: rgba(26,60,52,0.12);
      border-radius: 50%;
      top: -25px;
      right: -25px;
      z-index: 0;
    }
    h1 {
      font-size: 3.2rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--brand-deep);
      line-height: 1.2;
      margin-bottom: 1.2rem;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-rock);
      max-width: 90%;
      margin-bottom: 2rem;
    }
    .stats-row {
      display: flex;
      gap: 2.5rem;
      margin: 2.2rem 0 2.5rem;
      flex-wrap: wrap;
    }
    .stat-item .stat-number {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--accent-amber);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-rock);
      font-size: 0.9rem;
    }
    .btn-group {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-amber);
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      border: none;
      transition: all var(--transition-base);
      display: inline-block;
      box-shadow: 0 4px 10px rgba(232,122,42,0.2);
    }
    .btn-primary:hover {
      background: var(--hover-amber);
      box-shadow: 0 8px 18px rgba(232,122,42,0.3);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--brand-deep);
      color: var(--brand-deep);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      transition: all var(--transition-base);
      display: inline-block;
    }
    .btn-outline:hover {
      background: rgba(26,60,52,0.06);
      color: var(--brand-deep);
    }
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-left, .hero-right {
        flex: 1 1 auto;
      }
      .hero-sub {
        max-width: 100%;
      }
      .stats-row {
        justify-content: center;
      }
      .btn-group {
        justify-content: center;
      }
      h1 {
        font-size: 2.5rem;
      }
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--brand-deep);
      margin-bottom: 1rem;
    }
    .section-desc {
      color: var(--text-rock);
      max-width: 700px;
      margin-bottom: 3rem;
    }
    /* 核心优势 不对称网格 */
    .features-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .feature-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      transition: all var(--transition-base);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 2.2rem;
      color: var(--accent-amber);
      margin-bottom: 18px;
    }
    .feature-card h3 {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--brand-deep);
    }
    .feature-card p {
      color: var(--text-rock);
      margin: 0;
    }
    .feature-card.large {
      grid-row: span 2;
    }
    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 亮点网格 拼贴 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .highlight-item {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      aspect-ratio: 4 / 5;
      background: #ccc;
    }
    .highlight-item img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.35s ease;
    }
    .highlight-item:hover img {
      transform: scale(1.03);
    }
    .highlight-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      background: linear-gradient(transparent, rgba(26,60,52,0.8));
      color: white;
      padding: 24px 18px;
      font-weight: 700;
      font-size: 1.1rem;
    }
    @media (max-width: 1024px) {
      .highlights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .highlights-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 案例瀑布 */
    .cases-waterfall {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-base);
      border: 1px solid var(--card-border);
    }
    .case-card:hover {
      border-color: var(--accent-amber);
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .case-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }
    .case-content {
      padding: 20px;
    }
    .case-tag {
      background: var(--accent-amber);
      color: white;
      font-size: 0.75rem;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }
    .case-title {
      font-weight: 700;
      font-size: 1.2rem;
      color: var(--brand-deep);
    }
    .case-summary {
      color: var(--text-rock);
      font-size: 0.9rem;
      margin-top: 6px;
    }
    @media (max-width: 1024px) {
      .cases-waterfall {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .cases-waterfall {
        grid-template-columns: 1fr;
      }
    }
    /* 对比表 */
    .compare-table {
      display: flex;
      gap: 0;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .compare-col {
      flex: 1;
      padding: 36px 28px;
    }
    .left-col {
      background: #EBEDEC;
    }
    .right-col {
      background: #EDF2F0;
    }
    .compare-col h3 {
      font-weight: 700;
      color: var(--brand-deep);
      margin-bottom: 20px;
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }
    .check-icon {
      color: var(--accent-amber);
    }
    .cross-icon {
      color: #B0B5B3;
    }
    @media (max-width: 640px) {
      .compare-table {
        flex-direction: column;
      }
    }
    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--card-border);
      padding: 16px 0;
    }
    .accordion-question {
      font-weight: 600;
      font-size: 1.1rem;
      color: var(--text-rock);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color 0.2s;
    }
    .accordion-question:hover {
      color: var(--text-charcoal);
    }
    .accordion-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-rock);
      padding-left: 10px;
    }
    .accordion-item.active .accordion-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    .accordion-item.active .accordion-question {
      color: var(--brand-deep);
    }
    /* CTA 深色区 */
    .cta-dark {
      background: var(--deep-cta-bg);
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-blend-mode: overlay;
      color: white;
      text-align: center;
      padding: 100px 20px;
    }
    .cta-dark h2 {
      font-size: 2.5rem;
      font-weight: 700;
      color: white;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
      padding: 50px 0 30px;
    }
    .footer-brand {
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--brand-deep);
      margin-bottom: 10px;
    }
    .tag-cloud span {
      background: var(--card-bg);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin: 4px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }