/* roulang page: index */
:root {
      --deep-rock: #2B2D2A;
      --moss-green: #5C6B4B;
      --amber-glow: #D98C2E;
      --amber-deep: #B8731F;
      --warm-lime: #F7F6F2;
      --white: #FFFFFF;
      --soft-gray: #FAFAF8;
      --border-light: #E0E0DA;
      --text-muted: #6B6D68;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --shadow-soft: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-medium: 0 12px 32px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition-smooth: 0.25s ease-out;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-lime);
      color: var(--deep-rock);
      margin: 0;
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--deep-rock);
    }

    h1 {
      font-size: clamp(3rem, 6vw, 5rem);
      font-weight: 800;
      line-height: 1.1;
    }

    h2 {
      font-size: 2.2rem;
      margin-bottom: 1.5rem;
    }

    h3 {
      font-size: 1.5rem;
      margin-bottom: 0.5rem;
    }

    a {
      color: var(--deep-rock);
      text-decoration: none;
      transition: color 0.2s;
    }

    a:hover {
      color: var(--amber-glow);
    }

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

    /* 导航 */
    .custom-nav {
      background: rgba(247,246,242,0.88);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-light);
      padding: 0.8rem 0;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 99;
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.5px;
      color: var(--deep-rock);
    }

    .logo-icon {
      display: grid;
      grid-template-columns: 6px 6px;
      gap: 3px;
    }
    .logo-icon span {
      width: 6px;
      height: 6px;
      background: var(--amber-glow);
      border-radius: 1px;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
      font-weight: 500;
    }

    .nav-links a {
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--amber-glow);
      transition: 0.25s ease;
      transform: translateX(-50%);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 1.2rem;
    }

    .search-trigger {
      font-size: 1.2rem;
      color: var(--deep-rock);
      cursor: pointer;
    }

    .btn-login {
      background: transparent;
      border: none;
      font-weight: 500;
      color: var(--deep-rock);
      cursor: pointer;
    }

    .btn-cta-small {
      background: var(--amber-glow);
      color: white;
      border: none;
      padding: 0.5rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: 0.2s;
    }
    .btn-cta-small:hover {
      background: var(--amber-deep);
      box-shadow: 0 0 12px rgba(217,140,46,0.5);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--deep-rock);
      transition: 0.2s;
    }

    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 75%;
      max-width: 320px;
      height: 100vh;
      background: rgba(247,246,242,0.98);
      backdrop-filter: blur(20px);
      padding: 2rem;
      display: flex;
      flex-direction: column;
      gap: 1.8rem;
      transition: right 0.3s ease;
      z-index: 999;
      box-shadow: -8px 0 30px rgba(0,0,0,0.05);
    }
    .mobile-menu.active {
      right: 0;
    }
    .mobile-menu a {
      font-size: 1.2rem;
      font-weight: 500;
    }

    /* Hero */
    #hero {
      padding: 160px 0 100px;
      background: var(--warm-lime);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero-graphic {
      width: 100%;
      max-width: 500px;
      height: 400px;
      background: linear-gradient(135deg, rgba(92,107,75,0.15) 0%, rgba(217,140,46,0.08) 100%);
      border-radius: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
      animation: float 6s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0); }
    }
    .hero-graphic img {
      width: 80%;
      opacity: 0.9;
      filter: drop-shadow(0 12px 20px rgba(0,0,0,0.1));
    }

    .btn-primary {
      background: var(--amber-glow);
      color: white;
      border: none;
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      transition: 0.2s;
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--amber-deep);
      box-shadow: 0 0 18px rgba(217,140,46,0.6);
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--deep-rock);
      color: var(--deep-rock);
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s;
      margin-left: 1rem;
    }
    .btn-secondary:hover {
      background: var(--deep-rock);
      color: white;
    }

    /* 板块通用 */
    .section-padding {
      padding: 100px 0;
    }
    .section-title {
      margin-bottom: 3rem;
    }

    /* Features 非对称网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-soft);
      transition: var(--transition-smooth);
    }
    .feature-card:hover {
      box-shadow: var(--shadow-medium);
      transform: translateY(-4px);
    }
    .feature-icon {
      font-size: 2rem;
      color: var(--amber-glow);
      margin-bottom: 1.2rem;
    }
    .feature-title {
      font-weight: 700;
      margin-bottom: 0.5rem;
    }
    .feature-title::after {
      content: '';
      display: block;
      width: 32px;
      height: 4px;
      background: var(--amber-glow);
      margin-top: 0.5rem;
    }

    /* 案例瀑布 */
    .showcase-masonry {
      columns: 3;
      column-gap: 24px;
    }
    .showcase-card {
      break-inside: avoid;
      margin-bottom: 24px;
      border-radius: var(--radius-card);
      overflow: hidden;
      position: relative;
      box-shadow: var(--shadow-soft);
      transition: var(--transition-smooth);
    }
    .showcase-card:hover {
      box-shadow: var(--shadow-medium);
      transform: translateY(-2px);
    }
    .showcase-img {
      width: 100%;
      display: block;
    }
    .showcase-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(to top, rgba(43,45,42,0.7), transparent);
      padding: 1.5rem;
      color: white;
      transition: 0.25s;
    }
    .showcase-card:hover .showcase-overlay {
      background: rgba(43,45,42,0.25);
    }

    /* 方案对比 */
    .compare-cards {
      display: flex;
      gap: 24px;
    }
    .compare-item {
      flex: 1;
      background: var(--soft-gray);
      border-radius: var(--radius-card);
      padding: 2.2rem;
    }
    .compare-label {
      font-size: 2rem;
      font-weight: 800;
      color: var(--amber-glow);
    }

    /* FAQ */
    .faq-layout {
      display: flex;
      gap: 3rem;
    }
    .faq-left {
      flex: 0.3;
    }
    .faq-right {
      flex: 0.7;
    }
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-title {
      padding: 1.2rem 0;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: var(--soft-gray);
      padding: 0 1rem;
    }
    .accordion-item.active .accordion-content {
      max-height: 200px;
      padding: 1rem;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--deep-rock);
      color: white;
      text-align: center;
      padding: 80px 24px;
      border-radius: 28px;
      margin: 60px 0;
    }
    .glow-btn {
      background: var(--amber-glow);
      border: none;
      padding: 1rem 2.5rem;
      border-radius: 50px;
      font-weight: 700;
      color: white;
      box-shadow: 0 0 22px rgba(217,140,46,0.5);
      animation: pulse-glow 3s infinite;
    }
    @keyframes pulse-glow {
      0% { box-shadow: 0 0 10px rgba(217,140,46,0.4); }
      50% { box-shadow: 0 0 28px rgba(217,140,46,0.8); }
      100% { box-shadow: 0 0 10px rgba(217,140,46,0.4); }
    }

    /* 页脚 */
    .site-footer {
      background: var(--deep-rock);
      color: #C0C0BA;
      padding: 4rem 0 1.5rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    .social-icons i {
      font-size: 1.4rem;
      margin-right: 1rem;
      border: 1px solid #C0C0BA;
      border-radius: 50%;
      padding: 6px;
      transition: 0.2s;
    }
    .social-icons i:hover {
      background: var(--amber-glow);
      border-color: var(--amber-glow);
      color: white;
    }

    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2, 1fr); }
      .showcase-masonry { columns: 2; }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-actions .btn-login, .nav-actions .search-trigger { display: none; }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; }
      .compare-cards { flex-direction: column; }
      .faq-layout { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .features-grid { grid-template-columns: 1fr; }
      .showcase-masonry { columns: 1; }
    }