/* roulang page: index */
:root {
      --deep-green: #1A3C2A;
      --warm-gold: #D9B382;
      --bg-warm: #F7F4EF;
      --bg-dark: #1A3C2A;
      --card-bg: #FFFFFF;
      --accent: #E85D3F;
      --text-primary: #2C2C2C;
      --text-secondary: #5C5C5C;
      --border-soft: #C4BFB5;
      --shadow-card: 0 4px 20px rgba(26, 60, 42, 0.06);
      --shadow-hover: 0 12px 32px rgba(26, 60, 42, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --font-heading: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-body: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-mono: "SF Mono", "Cascadia Code", Consolas, monospace;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-primary);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      font-size: 16px;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      letter-spacing: -0.02em;
    }

    h1 {
      font-weight: 700;
      font-size: 3rem;
      line-height: 1.2;
    }

    h2 {
      font-weight: 600;
      font-size: 2.2rem;
      margin-bottom: 0.75rem;
    }

    h3 {
      font-weight: 500;
      font-size: 1.25rem;
    }

    a {
      text-decoration: none;
      transition: all 0.25s ease;
    }

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

    .container {
      max-width: 1280px;
      padding-left: 20px;
      padding-right: 20px;
      margin: 0 auto;
    }

    /* 导航 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(247, 244, 239, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-soft);
      z-index: 1000;
      display: flex;
      align-items: center;
      padding: 0 2rem;
    }

    .logo-text {
      font-family: var(--font-heading);
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--deep-green);
      letter-spacing: -0.5px;
    }

    .logo-text span {
      font-family: var(--font-mono);
      font-weight: 500;
      color: var(--warm-gold);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
      margin-left: auto;
    }

    .nav-link {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-secondary);
      padding: 0.25rem 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--deep-green);
      border-bottom-color: var(--warm-gold);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }

    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--deep-green);
      border-radius: 2px;
      transition: 0.2s;
    }

    /* 按钮系统 */
    .btn-primary-custom {
      background: var(--accent);
      color: #FFFFFF;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      border: none;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
    }

    .btn-primary-custom:hover {
      background: #C94A2F;
      box-shadow: 0 8px 24px rgba(232, 93, 63, 0.3);
      color: white;
      transform: translateY(-2px);
    }

    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--deep-green);
      color: var(--deep-green);
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      transition: 0.25s ease;
      display: inline-block;
      text-align: center;
    }

    .btn-outline-custom:hover {
      background: var(--deep-green);
      color: var(--bg-warm);
      border-color: var(--deep-green);
    }

    .btn-white-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      transition: 0.25s;
      display: inline-block;
    }

    .btn-white-outline:hover {
      background: rgba(255,255,255,0.15);
      color: white;
      border-color: white;
    }

    /* 区块间距 */
    section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      h1 {
        font-size: 2.2rem;
      }
      h2 {
        font-size: 1.8rem;
      }
    }

    /* Hero */
    .hero-section {
      min-height: 85vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #F7F4EF 0%, #E8E2D5 100%);
      padding-top: 72px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 55% 45%;
      gap: 2rem;
      align-items: center;
    }

    .hero-left h1 {
      color: var(--deep-green);
      margin-bottom: 1.25rem;
    }

    .hero-subtitle {
      font-size: 1.125rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
      max-width: 480px;
    }

    .hero-actions {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .hero-visual {
      background: rgba(217, 179, 130, 0.15);
      border-radius: 32px;
      padding: 2rem;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
      min-height: 360px;
    }

    .floating-shape {
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(26,60,42,0.2) 0%, transparent 60%),
                  repeating-linear-gradient(45deg, rgba(217,179,130,0.2) 0px, rgba(217,179,130,0.2) 2px, transparent 2px, transparent 8px);
      animation: floatSlow 6s infinite alternate ease-in-out;
    }

    @keyframes floatSlow {
      0% { transform: translate(0, 0); }
      100% { transform: translate(8px, -8px); }
    }

    /* 亮点网格 */
    .highlight-title {
      text-align: center;
      margin-bottom: 3rem;
    }

    .decor-line {
      width: 40px;
      height: 2px;
      background: var(--warm-gold);
      margin: 0.75rem auto 0;
    }

    .grid-asymmetric {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      grid-auto-rows: auto;
      gap: 24px;
    }

    .feature-item {
      background: transparent;
      padding: 1.5rem 1.5rem 1.5rem 1.8rem;
      border-left: 3px solid var(--deep-green);
      transition: all 0.3s ease;
    }

    .feature-item:hover {
      border-left-color: var(--accent);
      background: rgba(255,255,255,0.7);
    }

    .feature-item i {
      color: var(--warm-gold);
      font-size: 2rem;
      margin-bottom: 1rem;
    }

    .feature-item h3 {
      margin-bottom: 0.5rem;
    }

    /* 案例瀑布流 */
    .case-columns {
      column-count: 3;
      column-gap: 20px;
    }

    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      margin-bottom: 20px;
      break-inside: avoid;
      transition: all 0.3s ease;
    }

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

    .case-img {
      height: 220px;
      background-size: cover;
      background-position: center;
      transition: transform 0.3s;
    }

    .case-card:hover .case-img {
      transform: scale(1.03);
    }

    .case-body {
      padding: 16px;
    }

    .tag {
      background: #F7F4EF;
      color: var(--deep-green);
      font-size: 0.7rem;
      padding: 4px 10px;
      border-radius: 20px;
      display: inline-block;
      margin-right: 4px;
      margin-bottom: 8px;
    }

    /* 方案对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .compare-left {
      background: #FFFFFF;
      padding: 2.5rem;
    }

    .compare-right {
      background: var(--deep-green);
      color: white;
      padding: 2.5rem;
    }

    .compare-left h3, .compare-right h3 {
      font-size: 1.75rem;
      margin-bottom: 1.25rem;
    }

    .price-mono {
      font-family: var(--font-mono);
      color: var(--warm-gold);
      font-size: 1.5rem;
    }

    .feature-list {
      list-style: none;
      padding: 0;
      margin: 1.5rem 0;
    }

    .feature-list li {
      margin-bottom: 0.75rem;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    /* FAQ */
    .accordion-custom .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border-soft);
      background: transparent;
    }

    .accordion-custom .accordion-button {
      background: transparent;
      font-weight: 500;
      color: var(--text-primary);
      box-shadow: none;
      padding: 16px 0;
      font-size: 1rem;
    }

    .accordion-custom .accordion-button:not(.collapsed) {
      color: var(--deep-green);
      background: transparent;
    }

    .accordion-custom .accordion-button::after {
      background-image: none;
      content: "+";
      font-size: 1.5rem;
      font-weight: 300;
      transition: 0.25s;
    }

    .accordion-custom .accordion-button:not(.collapsed)::after {
      content: "−";
      transform: rotate(0deg);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--deep-green);
      padding: 80px 0;
      text-align: center;
    }

    /* 页脚 */
    .footer {
      background: var(--deep-green);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 20px;
    }

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

    .footer a {
      color: white;
    }

    .sub-footer {
      border-top: 1px solid rgba(255,255,255,0.15);
      margin-top: 2rem;
      padding-top: 1.5rem;
      font-size: 0.75rem;
    }

    @media (max-width: 992px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .case-columns {
        column-count: 2;
      }
      .compare-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .grid-asymmetric {
        grid-template-columns: 1fr;
      }
      .case-columns {
        column-count: 1;
      }
    }

    .mobile-menu {
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: var(--deep-green);
      padding: 2rem;
      display: none;
      flex-direction: column;
      gap: 1.5rem;
      z-index: 999;
    }

    .mobile-menu a {
      color: white;
      font-size: 1.25rem;
    }