/* roulang page: index */
:root {
      --primary: #E43D12;
      --primary-dark: #C8320E;
      --secondary: #1A1A1A;
      --accent: #00B4D8;
      --warm-bg: #F5F0EB;
      --text-body: #4A4A4A;
      --text-muted: #A0A0A0;
      --border-light: #E8E3DE;
      --white: #FFFFFF;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 12px 32px rgba(228,61,18,0.12);
      --shadow-nav: 0 2px 12px rgba(0,0,0,0.06);
      --radius-btn: 8px;
      --radius-card: 12px;
      --radius-img: 8px;
      --radius-large: 16px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-body: 'Inter', system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--warm-bg);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
    }
    /* 导航 */
    #header-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      transition: background 0.3s, box-shadow 0.3s;
      background: transparent;
      padding: 16px 0;
    }
    #header-nav.scrolled {
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(12px);
      box-shadow: var(--shadow-nav);
      padding: 12px 0;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-family: var(--font-heading);
      font-weight: 800;
      font-style: italic;
      font-size: 2rem;
      color: var(--primary);
      letter-spacing: -0.02em;
      display: flex;
      align-items: baseline;
      gap: 6px;
    }
    .logo .domain-suffix {
      font-size: 0.75rem;
      font-weight: 400;
      color: #6B6B6B;
      font-style: normal;
      letter-spacing: 0;
    }
    .desktop-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .desktop-links a {
      text-decoration: none;
      color: var(--secondary);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding-bottom: 4px;
      transition: color 0.2s;
    }
    .desktop-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s;
    }
    .desktop-links a:hover {
      color: var(--primary);
    }
    .desktop-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--secondary);
      cursor: pointer;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(26,26,26,0.95);
      backdrop-filter: blur(8px);
      z-index: 60;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 40px;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.3s;
    }
    .mobile-menu.active {
      display: flex;
      opacity: 1;
      pointer-events: auto;
    }
    .mobile-menu a {
      color: white;
      font-size: 1.8rem;
      font-weight: 600;
      text-decoration: none;
    }
    .close-menu {
      position: absolute;
      top: 24px;
      right: 24px;
      background: none;
      border: none;
      font-size: 2.2rem;
      color: white;
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .desktop-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
    }
    /* 板块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    /* 标题系统 */
    h2 {
      font-family: var(--font-heading);
      font-size: clamp(1.8rem, 3.5vw, 2.5rem);
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 20px;
      position: relative;
      display: inline-block;
    }
    h2::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 40px;
      height: 4px;
      background: var(--primary);
      border-radius: 2px;
    }
    .section-header-center {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-header-center h2::after {
      left: 50%;
      transform: translateX(-50%);
    }
    h3 {
      font-family: var(--font-heading);
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--secondary);
    }
    /* 卡片基础 */
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      overflow: hidden;
    }
    .card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }
    /* 按钮 */
    .btn {
      display: inline-block;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: all 0.25s;
      cursor: pointer;
      border: none;
      font-size: 1rem;
      text-align: center;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 6px 20px rgba(228,61,18,0.4);
      color: white;
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .btn-ghost {
      border: 2px solid white;
      color: white;
      background: transparent;
    }
    .btn-ghost:hover {
      background: white;
      color: var(--primary);
    }
    /* Hero */
    #hero {
      padding-top: 140px;
      padding-bottom: 100px;
      display: flex;
      align-items: center;
      min-height: 90vh;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-left h1 {
      font-family: var(--font-heading);
      font-size: clamp(2.5rem, 5vw, 4rem);
      font-weight: 800;
      letter-spacing: -0.02em;
      color: var(--secondary);
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 32px;
      max-width: 450px;
    }
    .hero-cta-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .micro-stats {
      display: flex;
      gap: 32px;
      flex-wrap: wrap;
    }
    .micro-stat {
      text-align: left;
    }
    .micro-stat .number {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }
    .micro-stat .label {
      font-size: 0.875rem;
      font-weight: 500;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      color: var(--primary);
      opacity: 0.8;
    }
    .hero-right {
      position: relative;
      height: 500px;
      border-radius: var(--radius-large);
      overflow: hidden;
      display: grid;
      grid-template-columns: 1fr 1fr;
      grid-template-rows: 1fr 1fr;
      gap: 8px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      filter: sepia(10%);
      box-shadow: inset 0 0 60px rgba(0,0,0,0.2);
    }
    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(228,61,18,0.08);
      pointer-events: none;
    }
    .hero-img-main {
      grid-row: 1 / 3;
      grid-column: 1 / 3;
      background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      opacity: 0.9;
      transform: scale(1.02);
      transition: transform 0.3s;
    }
    .hero-img-sub {
      background: url('/assets/images/coverpic/cover-1.webp') center/cover no-repeat;
      opacity: 0.85;
      transition: transform 0.3s;
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero-right {
        height: 300px;
        width: 80%;
        margin: 0 auto;
        order: -1;
      }
    }
    /* 亮点网格 */
    #edge {
      background: #f9f7f4;
    }
    .edge-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .edge-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 28px;
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 20px;
      align-items: flex-start;
      border-left: 4px solid var(--primary);
      transition: all 0.3s;
      min-height: 140px;
    }
    .edge-card.tall {
      grid-row: span 2;
      min-height: 320px;
      flex-direction: column;
      align-items: flex-start;
    }
    .edge-icon {
      font-size: 2rem;
      color: var(--primary);
      width: 48px;
      text-align: center;
      flex-shrink: 0;
    }
    .edge-content h3 {
      margin-bottom: 8px;
    }
    @media (max-width: 768px) {
      .edge-grid {
        grid-template-columns: 1fr;
      }
      .edge-card.tall {
        grid-row: auto;
        min-height: auto;
      }
    }
    /* 案例瀑布 */
    .showcase-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .showcase-card {
      position: relative;
      border-radius: var(--radius-img);
      overflow: hidden;
      aspect-ratio: 4 / 5;
      background: #ddd;
    }
    .showcase-card img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .showcase-card:hover img {
      transform: scale(1.05);
    }
    .showcase-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 30%;
      background: linear-gradient(to top, rgba(26,26,26,0.85), transparent);
      padding: 20px;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      transition: height 0.3s;
      color: white;
    }
    .showcase-card:hover .showcase-overlay {
      height: 50%;
    }
    .showcase-name {
      font-weight: 700;
      font-size: 1.1rem;
    }
    .showcase-tag {
      font-size: 0.8rem;
      opacity: 0.8;
    }
    @media (max-width: 768px) {
      .showcase-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    /* 对比表 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      max-width: 900px;
      margin: 0 auto;
    }
    .compare-col {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .compare-header {
      padding: 20px;
      font-weight: 700;
      font-size: 1.2rem;
      background: #F5F0EB;
      text-align: center;
    }
    .compare-col.pro .compare-header {
      background: rgba(228,61,18,0.1);
      color: var(--primary);
      border-bottom: 2px solid var(--primary);
    }
    .compare-row {
      display: flex;
      justify-content: space-between;
      padding: 16px 24px;
      border-bottom: 1px solid #E0E0E0;
    }
    .compare-row i {
      font-size: 1.1rem;
    }
    .fa-check { color: var(--accent); }
    .fa-times { color: #CCCCCC; }
    @media (max-width: 768px) {
      .compare-wrapper {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-container {
      max-width: 720px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 20px 0;
      text-align: left;
      font-weight: 700;
      font-size: 1.1rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--secondary);
      transition: 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      color: var(--text-body);
      line-height: 1.8;
      padding-left: 16px;
      border-left: 0px solid var(--primary);
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 0 20px 16px;
      border-left: 3px solid var(--primary);
    }
    .faq-item.active .faq-question {
      color: var(--primary);
    }
    /* CTA */
    #cta {
      background: linear-gradient(135deg, #E43D12 0%, #B8300A 100%);
      position: relative;
      overflow: hidden;
    }
    #cta::before {
      content: '';
      position: absolute;
      inset: 0;
      background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
      pointer-events: none;
    }
    .cta-content {
      position: relative;
      z-index: 2;
      text-align: center;
      color: white;
    }
    .cta-content h2 {
      color: white;
      font-size: 2.2rem;
    }
    .cta-content h2::after {
      background: white;
    }
    /* 页脚 */
    #footer {
      background: var(--secondary);
      color: #A0A0A0;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-logo {
      font-family: var(--font-heading);
      font-weight: 800;
      font-size: 2rem;
      color: white;
    }
    .footer-links a {
      display: block;
      color: #A0A0A0;
      text-decoration: none;
      margin-bottom: 8px;
      transition: color 0.2s;
    }
    .footer-links a:hover { color: white; }
    .social-icons i {
      font-size: 1.4rem;
      margin-right: 16px;
      color: #A0A0A0;
      transition: color 0.2s;
    }
    .social-icons i:hover { color: var(--primary); }
    .copyright {
      border-top: 1px solid #333;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 0.9rem;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 520px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }