/* roulang page: index */
:root {
      --primary-green: #C8FF00;
      --bg-deep: #0D0D0D;
      --bg-card: #1A1A1A;
      --bg-footer: #000000;
      --text-white: #F5F5F5;
      --text-gray: #B0B0B0;
      --text-muted: #A0A0A0;
      --border-subtle: #333333;
      --font-heading: 'DIN Next LT Pro', 'PingFang SC', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Noto Sans SC', 'Helvetica Neue', sans-serif;
      --font-number: 'DIN Next LT Pro', 'PingFang SC', sans-serif;
      --radius-sm: 2px;
      --radius-md: 4px;
      --transition-fast: 0.2s ease;
      --transition-smooth: 0.25s ease-out;
      --nav-height: 72px;
      --mobile-tab-height: 56px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-body);
      background-color: var(--bg-deep);
      color: var(--text-white);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      padding-bottom: var(--mobile-tab-height);
    }

    @media (min-width: 1024px) {
      body {
        padding-bottom: 0;
      }
    }

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

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 600;
      letter-spacing: -0.02em;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color var(--transition-fast);
    }

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

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-sm);
      transition: all var(--transition-fast);
      cursor: pointer;
      border: none;
      font-family: var(--font-heading);
      letter-spacing: 0.5px;
      padding: 14px 32px;
      font-size: 16px;
      line-height: 1.2;
    }

    .btn-primary {
      background: var(--primary-green);
      color: var(--bg-deep);
      border: 2px solid var(--primary-green);
    }

    .btn-primary:hover {
      background: #ffffff;
      color: var(--bg-deep);
      border-color: var(--primary-green);
      box-shadow: 0 0 0 2px var(--primary-green);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary-green);
      border: 1.5px solid var(--primary-green);
      padding: 13px 31px;
    }

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

    /* 头部导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      z-index: 100;
      background: transparent;
      transition: background 0.3s, backdrop-filter 0.3s;
      display: flex;
      align-items: center;
    }

    .site-header.scrolled {
      background: rgba(13, 13, 13, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 24px;
      letter-spacing: -0.5px;
    }
    .logo .v-highlight {
      color: var(--primary-green);
    }

    .desktop-nav {
      display: none;
      gap: 2.2rem;
      align-items: center;
    }

    .desktop-nav a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-white);
      position: relative;
      padding: 8px 0;
      transition: color var(--transition-fast);
      font-family: var(--font-body);
    }

    .desktop-nav a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-green);
      transition: width var(--transition-smooth);
    }

    .desktop-nav a:hover {
      color: var(--primary-green);
    }
    .desktop-nav a:hover::after {
      width: 100%;
    }

    @media (min-width: 1024px) {
      .desktop-nav {
        display: flex;
      }
    }

    /* 移动端底部Tab */
    .mobile-tab-bar {
      display: flex;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: var(--mobile-tab-height);
      background: rgba(20, 20, 20, 0.95);
      backdrop-filter: blur(10px);
      border-top: 0.5px solid var(--border-subtle);
      z-index: 110;
      justify-content: space-around;
      align-items: center;
      padding: 0 10px;
    }

    @media (min-width: 1024px) {
      .mobile-tab-bar {
        display: none;
      }
    }

    .tab-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-muted);
      font-size: 10px;
      transition: color var(--transition-fast);
      gap: 4px;
    }
    .tab-item i {
      font-size: 22px;
      line-height: 1;
    }
    .tab-item.active {
      color: var(--primary-green);
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }
    section.visible {
      opacity: 1;
      transform: translateY(0);
    }

    @media (min-width: 768px) {
      section {
        padding: 120px 0;
      }
    }
    .section-title {
      font-size: 28px;
      font-weight: 600;
      margin-bottom: 1.5rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 40px;
      height: 4px;
      background: var(--primary-green);
    }

    /* Hero */
    #hero {
      padding-top: 140px;
      padding-bottom: 80px;
      min-height: 100vh;
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: flex;
      flex-direction: column;
      gap: 40px;
    }
    @media (min-width: 1024px) {
      .hero-grid {
        flex-direction: row;
        align-items: center;
        gap: 80px;
      }
    }
    .hero-left {
      max-width: 600px;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.1;
      color: var(--text-white);
    }
    .hero-title .v-giant {
      font-size: 110px;
      color: var(--primary-green);
      display: block;
      line-height: 0.9;
      margin-bottom: 0.2em;
    }
    .hero-desc {
      font-size: 18px;
      color: var(--text-gray);
      margin: 1.5rem 0 2rem;
    }
    .hero-actions {
      display: flex;
      gap: 20px;
      align-items: center;
      flex-wrap: wrap;
    }
    .hero-right {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 320px;
      border-radius: var(--radius-md);
      position: relative;
      overflow: hidden;
    }
    .dynamic-graphic {
      position: absolute;
      inset: 0;
      background: linear-gradient(45deg, rgba(200,255,0,0.05) 0%, transparent 50%);
      animation: floatGraphic 8s infinite alternate ease-in-out;
    }
    @keyframes floatGraphic {
      0% { transform: scale(1.02) rotate(0deg); }
      100% { transform: scale(1.08) rotate(2deg); }
    }

    /* 亮点网格 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    @media (min-width: 768px) {
      .advantages-grid {
        grid-template-columns: repeat(3, 1fr);
      }
    }
    .adv-card {
      background: transparent;
      padding: 24px 16px;
      border-radius: var(--radius-sm);
      transition: all var(--transition-smooth);
      border: 1px solid transparent;
    }
    .adv-card:hover {
      background: var(--bg-card);
      transform: translateY(-4px);
      border-top: 2px solid var(--primary-green);
    }
    .adv-icon {
      font-size: 32px;
      color: var(--primary-green);
      margin-bottom: 16px;
    }

    /* 业务版图 */
    .service-row {
      display: flex;
      flex-direction: column;
      gap: 60px;
      margin: 60px 0;
    }
    .service-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 30px;
    }
    @media (min-width: 768px) {
      .service-item {
        flex-direction: row;
      }
      .service-item.reverse {
        flex-direction: row-reverse;
      }
    }
    .service-img {
      flex: 1;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: inset 0 0 0 1px rgba(255,255,255,0.1);
    }
    .service-text {
      flex: 1;
    }

    /* 案例瀑布流 */
    .masonry {
      column-count: 1;
      column-gap: 20px;
    }
    @media (min-width: 640px) {
      .masonry { column-count: 2; }
    }
    @media (min-width: 1024px) {
      .masonry { column-count: 3; }
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 20px;
      position: relative;
      border-radius: var(--radius-sm);
      overflow: hidden;
    }
    .masonry-item img {
      width: 100%;
      display: block;
    }
    .case-overlay {
      position: absolute;
      inset: 0;
      background: rgba(200,255,0,0);
      transition: background var(--transition-smooth);
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      padding: 20px;
    }
    .masonry-item:hover .case-overlay {
      background: rgba(200,255,0,0.15);
    }
    .case-title {
      color: white;
      font-weight: 600;
      opacity: 0;
      transform: translateY(10px);
      transition: all 0.3s;
    }
    .masonry-item:hover .case-title {
      opacity: 1;
      transform: translateY(0);
    }

    /* 对比表 */
    .compare-table {
      display: flex;
      flex-direction: column;
      border: 1px solid var(--border-subtle);
    }
    @media (min-width: 640px) {
      .compare-table { flex-direction: row; }
    }
    .compare-col {
      flex: 1;
      padding: 40px 24px;
    }
    .compare-left {
      background: #1a1a1a;
    }
    .compare-right {
      background: #0f0f0f;
    }
    .compare-divider {
      width: 1px;
      background: var(--border-subtle);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-subtle);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      background: transparent;
      color: var(--text-gray);
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      background: var(--bg-card);
      padding: 20px;
      margin-top: 12px;
    }

    /* CTA */
    .cta-dark {
      background: #111111;
    }

    /* Footer */
    .footer-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    @media (min-width: 768px) {
      .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
    }
    .copyright {
      border-top: 1px solid #222;
      margin-top: 40px;
      padding-top: 20px;
      color: #888;
    }