/* roulang page: index */
:root {
      --primary: #1A2421;
      --accent: #C8FF00;
      --accent-deep: #B3E600;
      --bg-warm: #F7F5F0;
      --bg-soft-green: #F2F5F0;
      --white: #FFFFFF;
      --text-main: #1E1E1E;
      --text-secondary: #5C5C5C;
      --text-on-dark: #F0F0F0;
      --border-light: #D9DDD8;
      --card-shadow: 0 2px 12px rgba(26,36,33,0.06);
      --card-hover-shadow: 0 8px 28px rgba(26,36,33,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-tag: 4px;
      --section-gap: 100px;
      --grid-gap: 24px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-title);
      font-weight: 700;
      transition: background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-width: 44px;
      min-height: 44px;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      background: rgba(255,255,255,0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      transition: all 0.3s ease;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    .logo {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 1.8rem;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-main);
      font-size: 1rem;
      transition: color 0.2s;
    }

    .nav-links a:hover {
      color: var(--accent-deep);
    }

    .btn-primary {
      background: var(--accent);
      color: var(--primary);
      border: none;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 800;
      font-size: 1rem;
    }

    .btn-primary:hover {
      background: var(--accent-deep);
      transform: scale(1.03);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 700;
    }

    .btn-outline:hover {
      background: rgba(200,255,0,0.1);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 2rem;
      color: var(--primary);
    }

    /* 移动端全屏菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: var(--primary);
      color: white;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 999;
      transform: translateX(100%);
      transition: transform 0.35s ease;
    }

    .mobile-menu.active {
      transform: translateX(0);
    }

    .mobile-menu a {
      color: white;
      font-size: 1.6rem;
      font-weight: 600;
    }

    .mobile-close {
      position: absolute;
      top: 32px;
      right: 32px;
      background: none;
      border: none;
      color: white;
      font-size: 2.5rem;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
    }

    /* Hero */
    .hero {
      padding-top: 140px;
      padding-bottom: 80px;
      display: flex;
      align-items: center;
      gap: 64px;
      background-color: var(--bg-warm);
    }

    .hero-left {
      flex: 1.2;
    }

    .hero-left h1 {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: clamp(2.8rem, 6vw, 3.5rem);
      line-height: 1.15;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 36px;
      max-width: 540px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 28px;
    }

    .scroll-hint {
      color: var(--text-secondary);
      font-size: 0.9rem;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .hero-right {
      flex: 0.9;
      position: relative;
    }

    .hero-img {
      width: 100%;
      border-radius: 16px;
      object-fit: cover;
      aspect-ratio: 4/3;
      background: #dce2db;
      position: relative;
      z-index: 2;
    }

    .hero-right::before {
      content: "";
      position: absolute;
      left: -8px;
      top: -16px;
      bottom: -16px;
      width: 3px;
      background: var(--accent);
      z-index: 3;
      border-radius: 3px;
    }

    @media (max-width: 1024px) {
      .hero {
        flex-direction: column;
        padding-top: 120px;
        gap: 40px;
      }
      .hero-right::before {
        left: -4px;
        top: -8px;
        bottom: -8px;
      }
    }

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

    .section-title {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 2.2rem;
      margin-bottom: 16px;
      color: var(--primary);
    }

    /* 亮点网格 2x3 不规则 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--grid-gap);
    }

    .highlight-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--card-shadow);
      transition: transform 0.25s cubic-bezier(0.2, 0.8, 0.4, 1), box-shadow 0.25s;
    }

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

    .highlight-card i {
      font-size: 2.2rem;
      color: var(--accent-deep);
      margin-bottom: 20px;
    }

    .highlight-card h3 {
      font-weight: 700;
      margin-bottom: 10px;
    }

    .span-2-col {
      grid-column: span 2;
    }

    .span-2-row {
      grid-row: span 2;
    }

    @media (max-width: 1024px) {
      .highlights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .span-2-col, .span-2-row {
        grid-column: span 1;
        grid-row: span 1;
      }
    }

    @media (max-width: 600px) {
      .highlights-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 瀑布流案例 */
    .masonry {
      columns: 3 280px;
      column-gap: 24px;
    }

    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: transform 0.2s;
    }

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

    .case-img-wrap {
      position: relative;
      overflow: hidden;
    }

    .case-img-wrap img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      background: #ccc;
    }

    .case-overlay {
      position: absolute;
      inset: 0;
      background: rgba(26,36,33,0.75);
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    .case-card:hover .case-overlay {
      opacity: 1;
    }

    .case-overlay span {
      color: var(--accent);
      font-weight: 700;
      font-size: 1.1rem;
    }

    .case-info {
      padding: 20px;
    }

    .case-tags {
      color: var(--accent-deep);
      font-weight: 600;
      font-size: 0.9rem;
      margin: 8px 0;
    }

    /* 方案对比 */
    .compare-row {
      display: flex;
      gap: 28px;
      align-items: stretch;
    }

    .compare-col {
      background: white;
      border-radius: var(--radius-card);
      padding: 36px;
      flex: 1;
      display: flex;
      flex-direction: column;
      border: 1px solid transparent;
    }

    .compare-col.recommended {
      border-color: var(--accent);
      position: relative;
    }

    .badge {
      background: var(--accent);
      color: var(--primary);
      font-weight: 800;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-bottom: 12px;
    }

    .compare-list {
      list-style: none;
      margin: 24px 0;
    }

    .compare-list li {
      margin-bottom: 12px;
    }

    .compare-list i {
      color: var(--accent-deep);
      margin-right: 8px;
    }

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

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    .faq-item {
      background: white;
      border-radius: var(--radius-btn);
      padding: 20px;
      cursor: pointer;
      transition: background 0.3s;
      border: 1px solid var(--border-light);
    }

    .faq-item.active {
      background: var(--bg-soft-green);
      box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 700;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

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

    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary);
      padding: 80px 0;
      text-align: center;
      color: white;
      position: relative;
      background-image: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.05) 0%, transparent 30%);
    }

    .cta-banner h2 {
      color: white;
      font-size: 2.4rem;
      margin-bottom: 16px;
    }

    /* 页脚 */
    .footer {
      background: var(--primary);
      color: var(--text-on-dark);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }

    .social-icons i {
      font-size: 1.6rem;
      margin-right: 16px;
      color: #ccc;
      transition: color 0.2s;
    }

    .social-icons i:hover {
      color: var(--accent);
    }

    .copyright {
      text-align: center;
      margin-top: 48px;
      color: #aaa;
    }

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