/* roulang page: index */
:root {
      --deep-space: #0B1A2E;
      --electric-cyan: #00E5CC;
      --lava-orange: #FF5E3A;
      --bg-secondary: #0F2238;
      --bg-deeper: #0A1525;
      --glass-bg: rgba(255, 255, 255, 0.04);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-highlight: rgba(255, 255, 255, 0.1);
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255, 255, 255, 0.75);
      --text-muted: rgba(255, 255, 255, 0.45);
      --radius-card: 16px;
      --radius-button: 12px;
      --radius-input: 8px;
      --shadow-glow-cyan: 0 0 24px rgba(0, 229, 204, 0.4);
      --shadow-glow-lava: 0 0 30px rgba(255, 94, 58, 0.5);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: "Inter", "SF Pro Display", system-ui;
      --transition-bounce: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }

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

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

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-space);
      color: var(--text-secondary);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 顶部导航 PC */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(11, 26, 46, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(0, 229, 204, 0.25);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: var(--transition-bounce);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      color: var(--text-primary);
      font-weight: 700;
      font-size: 1.4rem;
      letter-spacing: 0.02em;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 6px;
      filter: drop-shadow(0 0 6px rgba(0,229,204,0.3));
    }

    .nav-links {
      display: flex;
      gap: 2.5rem;
      list-style: none;
    }

    .nav-links a {
      text-decoration: none;
      color: rgba(255, 255, 255, 0.7);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding-bottom: 4px;
      transition: color 0.2s;
    }

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

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--electric-cyan);
      box-shadow: 0 0 10px var(--electric-cyan);
    }

    .header-cta {
      background: var(--electric-cyan);
      color: var(--deep-space);
      font-weight: 600;
      padding: 10px 22px;
      border-radius: 40px;
      text-decoration: none;
      font-size: 0.9rem;
      box-shadow: var(--shadow-glow-cyan);
      transition: var(--transition-bounce);
    }

    .header-cta:hover {
      box-shadow: 0 0 40px rgba(0, 229, 204, 0.7);
      transform: translateY(-1px);
    }

    /* 移动端底部胶囊导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      background: rgba(11, 26, 46, 0.9);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-radius: 40px;
      padding: 8px 20px;
      z-index: 1001;
      border: 1px solid rgba(255,255,255,0.1);
      box-shadow: 0 10px 30px rgba(0,0,0,0.5);
      display: flex;
      gap: 1.8rem;
      justify-content: center;
    }

    .mobile-bottom-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-decoration: none;
      color: rgba(255,255,255,0.55);
      font-size: 0.7rem;
      font-weight: 500;
      transition: 0.2s;
    }

    .mobile-bottom-nav a i {
      font-size: 1.3rem;
      margin-bottom: 2px;
    }

    .mobile-bottom-nav a.active {
      color: var(--electric-cyan);
      text-shadow: 0 0 8px rgba(0,229,204,0.6);
    }

    @media (max-width: 768px) {
      .main-header {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
      }
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 30%, rgba(0,229,204,0.08) 0%, transparent 50%), 
                  radial-gradient(circle at 80% 70%, rgba(255,94,58,0.05) 0%, transparent 50%);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-left h1 {
      font-size: 56px;
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -0.02em;
      color: var(--text-primary);
      margin-bottom: 20px;
    }

    .hero-left p {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 90%;
    }

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

    .btn-primary {
      background: var(--electric-cyan);
      color: var(--deep-space);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      text-decoration: none;
      box-shadow: var(--shadow-glow-cyan);
      transition: var(--transition-bounce);
      border: none;
      cursor: pointer;
      display: inline-block;
    }

    .btn-primary:hover {
      box-shadow: 0 0 40px rgba(0,229,204,0.7);
      transform: scale(1.02);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--electric-cyan);
      color: var(--electric-cyan);
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition-bounce);
    }

    .btn-secondary:hover {
      background: rgba(0,229,204,0.1);
    }

    .hero-right {
      display: flex;
      gap: 16px;
      position: relative;
      height: 420px;
    }

    .hero-img-collage {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      width: 100%;
    }

    .hero-img-item {
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-card);
      border: 1px solid rgba(255,255,255,0.1);
      transition: transform 0.3s;
    }

    .hero-img-item:nth-child(1) { grid-row: span 2; background-image: url('/assets/images/backpic/back-2.webp'); }
    .hero-img-item:nth-child(2) { background-image: url('/assets/images/coverpic/cover-1.webp'); }
    .hero-img-item:nth-child(3) { background-image: url('/assets/images/coverpic/cover-2.webp'); }

    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero-right {
        height: 300px;
        order: -1;
      }
      .hero-left h1 {
        font-size: 42px;
      }
    }

    /* 通用板块标题 */
    .section-title {
      font-size: 40px;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 12px;
      line-height: 1.2;
    }

    .section-label {
      font-size: 14px;
      text-transform: uppercase;
      letter-spacing: 0.12em;
      color: var(--electric-cyan);
      margin-bottom: 8px;
      font-weight: 500;
    }

    .section-spacing {
      margin-top: 120px;
    }

    @media (max-width: 768px) {
      .section-title {
        font-size: 28px;
      }
      .section-spacing {
        margin-top: 80px;
      }
    }

    /* 核心价值 不对称网格 */
    .values-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }

    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: inset 0 1px 0 var(--glass-highlight);
      transition: var(--transition-bounce);
    }

    .glass-card:hover {
      border-color: rgba(0,229,204,0.3);
      box-shadow: 0 8px 30px rgba(0,229,204,0.1), inset 0 1px 0 rgba(255,255,255,0.2);
    }

    .small-cards {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .big-number {
      font-family: var(--font-mono);
      font-size: 48px;
      font-weight: 800;
      color: var(--electric-cyan);
      text-shadow: 0 0 20px rgba(0,229,204,0.5);
    }

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

    /* 业务领域 错落卡片流 */
    .biz-flow {
      display: flex;
      flex-direction: column;
      gap: 32px;
    }

    .biz-row {
      display: flex;
      gap: 24px;
      align-items: center;
    }

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

    .biz-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: var(--transition-bounce);
    }

    .biz-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 30px rgba(0,229,204,0.15);
    }

    .biz-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }

    .biz-content {
      padding: 24px;
    }

    .biz-row .biz-card:first-child { flex: 3; }
    .biz-row .biz-card:last-child { flex: 2; margin-top: -20px; }

    @media (max-width: 768px) {
      .biz-row, .biz-row.reverse {
        flex-direction: column;
      }
      .biz-row .biz-card:last-child {
        margin-top: 0;
      }
    }

    /* 数据实力 */
    .data-strip {
      background: var(--bg-deeper);
      padding: 80px 0;
      display: flex;
      justify-content: center;
      gap: 60px;
      flex-wrap: wrap;
      text-align: center;
    }

    .data-item .count {
      font-family: var(--font-mono);
      font-size: 48px;
      font-weight: 800;
      color: var(--electric-cyan);
    }

    /* 解决方案对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .compare-card {
      padding: 32px;
      border-radius: var(--radius-card);
    }

    .compare-left {
      background: rgba(255,59,48,0.08);
      border: 1px solid rgba(255,59,48,0.2);
    }

    .compare-right {
      background: rgba(0,229,204,0.06);
      border: 1px solid rgba(0,229,204,0.2);
    }

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

    /* 合作伙伴 */
    .logo-wall {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 32px;
      filter: grayscale(100%) opacity(0.5);
    }
    .logo-wall img {
      height: 40px;
      transition: 0.3s;
    }
    .logo-wall img:hover {
      filter: none;
      opacity: 1;
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 20px;
    }
    @media (max-width: 768px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #0B1A2E 0%, #0A2A3A 100%);
      padding: 80px 0;
      text-align: center;
    }
    .btn-lava {
      background: var(--lava-orange);
      color: white;
      padding: 16px 40px;
      border-radius: 40px;
      font-weight: 700;
      box-shadow: var(--shadow-glow-lava);
      border: none;
      cursor: pointer;
      transition: var(--transition-bounce);
      text-decoration: none;
      display: inline-block;
    }
    .btn-lava:hover {
      box-shadow: 0 0 50px rgba(255,94,58,0.8);
      transform: scale(1.03);
    }

    /* 页脚 */
    .footer {
      background: #0A1525;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    .copyright {
      text-align: center;
      margin-top: 40px;
      color: var(--text-muted);
    }