/* roulang page: index */
:root {
      --deep-charcoal: #1a1a1a;
      --mid-charcoal: #2d2d2d;
      --dark-bg: #121212;
      --electric-teal: #00e5a0;
      --teal-dark: #00c78c;
      --warm-amber: #f0b823;
      --light-gray-bg: #f4f6f9;
      --card-glass-bg: rgba(255,255,255,0.05);
      --card-glass-border: rgba(255,255,255,0.1);
      --text-body: #cccccc;
      --text-muted: #888888;
      --text-dark: #121212;
      --footer-bg: #0a0a0a;
      --white-soft: #dddddd;
      --nav-link: #aaaaaa;
      --shadow-teal: rgba(0,229,160,0.15);
      --glow-teal: rgba(0,229,160,0.5);
      --radius-card: 16px;
      --radius-btn: 8px;
      --transition-smooth: 0.3s ease;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      background-color: var(--dark-bg);
      font-family: var(--font-stack);
      color: var(--text-body);
      margin: 0;
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    h1, h2, h3, h4 {
      margin-top: 0;
      color: #ffffff;
      font-weight: 700;
    }

    h1 { font-size: 48px; line-height: 1.2; }
    h2 { font-size: 36px; line-height: 1.3; }
    h3 { font-size: 22px; font-weight: 600; }

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

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(18,18,18,0.85);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      z-index: 100;
      border-bottom: 1px solid rgba(255,255,255,0.05);
      transition: background 0.3s;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--electric-teal);
      letter-spacing: 0.5px;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
    }

    .nav-links a {
      color: var(--nav-link);
      font-weight: 500;
      padding-bottom: 4px;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
      font-size: 15px;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--electric-teal);
      border-bottom-color: var(--electric-teal);
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      color: #fff;
      font-size: 26px;
      cursor: pointer;
    }

    /* Hero 区块 */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
      background-blend-mode: overlay;
      background-color: rgba(0,0,0,0.3);
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(18,18,18,0.85) 0%, rgba(18,18,18,0.4) 70%);
      z-index: 1;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 650px;
      padding: 0 24px;
    }

    .hero-badge {
      display: inline-block;
      background: rgba(0,229,160,0.15);
      color: var(--electric-teal);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 24px;
      border: 1px solid rgba(0,229,160,0.3);
    }

    .btn {
      display: inline-block;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      text-align: center;
      transition: all var(--transition-smooth);
      cursor: pointer;
      border: 2px solid transparent;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--electric-teal), var(--teal-dark));
      color: var(--text-dark);
      border: none;
      box-shadow: 0 4px 12px rgba(0,229,160,0.3);
    }

    .btn-primary:hover {
      box-shadow: 0 0 20px var(--glow-teal);
      filter: brightness(1.1);
      color: var(--text-dark);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--electric-teal);
      color: var(--electric-teal);
    }

    .btn-outline:hover {
      background: var(--electric-teal);
      color: var(--text-dark);
      border-color: var(--electric-teal);
    }

    .section-padding {
      padding: 100px 0;
    }

    .section-header {
      text-align: center;
      margin-bottom: 64px;
    }

    .section-header h2 {
      color: #fff;
      margin-bottom: 12px;
    }

    .section-subtitle {
      color: var(--text-muted);
      font-size: 18px;
    }

    /* 卡片玻璃拟态 */
    .glass-card {
      background: var(--card-glass-bg);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--card-glass-border);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
    }

    .glass-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 8px 32px var(--shadow-teal);
    }

    /* 特征卡片 */
    .feature-icon {
      font-size: 38px;
      color: var(--electric-teal);
      margin-bottom: 20px;
    }

    /* 服务交替布局 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }

    .service-row.reverse {
      flex-direction: row-reverse;
    }

    .service-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      height: 280px;
    }

    .service-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .service-text {
      flex: 1;
    }

    .text-link {
      color: var(--electric-teal);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: gap 0.2s;
    }

    .text-link:hover {
      gap: 12px;
      color: #fff;
    }

    /* 案例卡片 */
    .case-card {
      background: var(--card-glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--card-glass-border);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: all var(--transition-smooth);
      cursor: pointer;
      height: 100%;
    }

    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 12px 28px var(--shadow-teal);
    }

    .case-img {
      height: 200px;
    }

    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .case-body {
      padding: 24px;
    }

    .metric {
      color: var(--warm-amber);
      font-weight: 700;
      font-size: 20px;
      margin-top: 8px;
    }

    /* FAQ 手风琴 */
    .accordion-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .accordion-title {
      background: transparent;
      color: var(--white-soft);
      font-weight: 600;
      font-size: 18px;
      padding: 18px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color 0.2s;
    }

    .accordion-title i {
      font-size: 18px;
      transition: transform 0.3s;
    }

    .accordion-item.active .accordion-title {
      color: var(--electric-teal);
    }

    .accordion-item.active .accordion-title i {
      transform: rotate(180deg);
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: #bbbbbb;
      padding-bottom: 0;
    }

    .accordion-item.active .accordion-content {
      max-height: 300px;
      padding-bottom: 18px;
    }

    /* CTA 区块 */
    #cta {
      background: linear-gradient(135deg, #1e2b2a, #0f1f1c);
      text-align: center;
    }

    /* 页脚 */
    .site-footer {
      background: var(--footer-bg);
      color: var(--text-muted);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
    }

    .footer-logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--electric-teal);
      margin-bottom: 12px;
    }

    .footer-links a {
      display: block;
      color: var(--nav-link);
      margin-bottom: 10px;
    }

    .footer-links a:hover {
      color: var(--electric-teal);
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.08);
      margin-top: 40px;
      padding-top: 24px;
      text-align: center;
      font-size: 14px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      h1 { font-size: 38px; }
      .service-row, .service-row.reverse {
        flex-direction: column;
        gap: 32px;
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 640px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(18,18,18,0.95);
        backdrop-filter: blur(16px);
        padding: 20px;
        gap: 16px;
      }
      .nav-links.open {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
      .glass-card {
        padding: 24px;
        border-radius: 12px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-content {
        padding: 0 16px;
      }
      .btn {
        padding: 12px 24px;
        font-size: 15px;
      }
    }