/* roulang page: index */
:root {
      --bg-deep: #0A0A14;
      --accent-cyan: #00F0FF;
      --accent-pink: #FF6FD8;
      --gradient-rainbow: linear-gradient(135deg, #FF6FD8 0%, #3813C2 100%);
      --text-white: #FFFFFF;
      --text-light: #C8C8DE;
      --text-muted: #7A7A9E;
      --glass-bg: rgba(20, 20, 50, 0.6);
      --glass-border: rgba(255, 255, 255, 0.08);
      --card-radius-lg: 16px;
      --card-radius: 12px;
      --btn-radius: 50px;
      --spacing-sm: 20px;
      --spacing-md: 24px;
      --spacing-lg: 40px;
      --max-width: 1280px;
      --nav-width: 72px;
      --font-sans: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-mono: 'Inter', 'SF Mono', monospace;
    }

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

    body {
      font-family: var(--font-sans);
      background: var(--bg-deep);
      color: var(--text-light);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, input, textarea {
      font-family: inherit;
      font-size: inherit;
    }

    /* 容器桌面左缩进，避开左侧导航 */
    .main-content {
      margin-left: var(--nav-width);
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding-left: var(--spacing-lg);
      padding-right: var(--spacing-lg);
      width: 100%;
    }

    /* 左侧竖向导航 */
    .side-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: var(--nav-width);
      height: 100vh;
      background: rgba(10, 10, 20, 0.85);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 28px 0 28px;
      z-index: 1000;
      border-right: 1px solid transparent;
      border-image: linear-gradient(180deg, #FF6FD8, #3813C2, #00F0FF) 1;
    }

    .nav-logo {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }

    .logo-icon {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--gradient-rainbow);
      box-shadow: 0 0 20px rgba(0,240,255,0.5);
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 20px;
    }

    .logo-text {
      writing-mode: vertical-rl;
      text-orientation: mixed;
      font-weight: 700;
      font-size: 14px;
      letter-spacing: 4px;
      color: white;
    }

    .nav-links {
      display: flex;
      flex-direction: column;
      gap: 28px;
    }

    .nav-links a {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 44px;
      height: 44px;
      border-radius: 12px;
      color: var(--text-muted);
      transition: all 0.25s;
      font-size: 20px;
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-cyan);
      background: rgba(0, 240, 255, 0.08);
      box-shadow: 0 0 12px rgba(0,240,255,0.3);
    }

    .nav-links a.active {
      color: var(--accent-pink);
    }

    .nav-bottom {
      display: flex;
      flex-direction: column;
      gap: 16px;
      color: var(--text-muted);
    }

    /* 移动端顶部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      height: 56px;
      background: rgba(10, 10, 20, 0.9);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      z-index: 1001;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }

    .mobile-logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      color: white;
    }

    .hamburger {
      font-size: 24px;
      color: var(--accent-cyan);
      background: transparent;
      border: none;
      cursor: pointer;
    }

    .mobile-drawer {
      display: none;
      position: fixed;
      top: 56px;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(10, 10, 20, 0.95);
      backdrop-filter: blur(25px);
      flex-direction: column;
      padding: 32px 24px;
      gap: 24px;
      z-index: 999;
    }

    .mobile-drawer a {
      font-size: 20px;
      font-weight: 500;
      color: var(--text-light);
      padding: 12px 0;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }

    /* 区块通用 */
    section {
      padding: 100px 0;
      position: relative;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: white;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }

    /* Hero */
    .hero-section {
      display: flex;
      align-items: center;
      min-height: 100vh;
      padding-top: 0;
      padding-bottom: 0;
    }

    .hero-grid {
      display: flex;
      width: 100%;
      gap: 40px;
    }

    .hero-left {
      flex: 0 0 58%;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .hero-right {
      flex: 1;
      position: relative;
      min-height: 520px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 32px;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(10,10,20,0.65);
    }

    .floating-card {
      position: relative;
      z-index: 2;
      width: 220px;
      height: 280px;
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border-radius: 24px;
      border: 1px solid var(--glass-border);
      box-shadow: 0 12px 40px rgba(0,240,255,0.15);
      animation: float 6s ease-in-out infinite;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
    }

    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-18px); }
      100% { transform: translateY(0); }
    }

    .hero-title {
      font-size: 3.8rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
      background: linear-gradient(to right, #00F0FF, #FF6FD8);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-light);
      margin-bottom: 32px;
      max-width: 500px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 32px;
    }

    .btn-primary {
      background: linear-gradient(135deg, #00F0FF, #FF6FD8);
      color: white;
      padding: 14px 38px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      border: none;
      cursor: pointer;
      box-shadow: 0 0 20px rgba(0,240,255,0.45);
      transition: all 0.3s;
    }

    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(255,111,216,0.75);
      transform: scale(1.03);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 14px 38px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      cursor: pointer;
      transition: 0.3s;
    }

    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
    }

    .trust-badges {
      display: flex;
      gap: 28px;
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    .trust-badges span strong {
      color: var(--accent-cyan);
      font-family: var(--font-mono);
      font-size: 1.3rem;
    }

    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .highlight-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius-lg);
      padding: 28px;
      box-shadow: 0 8px 32px rgba(0,240,255,0.06);
      transition: 0.25s;
    }

    .highlight-card:hover {
      box-shadow: 0 12px 40px rgba(0,240,255,0.2);
      border-color: rgba(0,240,255,0.3);
    }

    .highlight-number {
      font-family: var(--font-mono);
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent-cyan);
      line-height: 1;
    }

    .highlight-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: white;
      margin: 12px 0 8px;
    }

    .wide-card {
      grid-column: span 2;
    }

    /* 案例瀑布流 */
    .cases-masonry {
      column-count: 2;
      column-gap: 24px;
      margin-top: 48px;
    }

    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border-radius: var(--card-radius);
      border: 1px solid var(--glass-border);
      overflow: hidden;
      transition: all 0.3s;
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 35px rgba(0,240,255,0.25);
    }

    .case-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      background: #1a1a2e;
    }

    .case-content {
      padding: 20px;
    }

    .case-tag {
      display: inline-block;
      font-size: 0.8rem;
      color: var(--accent-cyan);
      background: rgba(0,240,255,0.1);
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 8px;
    }

    .case-title {
      font-weight: 700;
      color: white;
      margin-bottom: 6px;
    }

    /* 方案对比 */
    .compare-panel {
      display: flex;
      gap: 0;
      margin-top: 48px;
      position: relative;
    }

    .compare-divider {
      width: 2px;
      background: linear-gradient(180deg, #FF6FD8, #00F0FF);
      margin: 0 20px;
    }

    .plan-card {
      flex: 1;
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border-radius: var(--card-radius-lg);
      padding: 36px;
      border: 1px solid var(--glass-border);
    }

    .plan-badge {
      background: #FF6FD8;
      color: white;
      font-size: 0.75rem;
      padding: 4px 14px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 12px;
    }

    .plan-price {
      font-size: 1.8rem;
      font-weight: 700;
      color: white;
      margin: 20px 0;
    }

    /* FAQ */
    .faq-list {
      margin-top: 40px;
      max-width: 800px;
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.06);
      padding: 20px 0;
      cursor: pointer;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      color: white;
      font-size: 1.1rem;
    }

    .faq-answer {
      margin-top: 12px;
      color: var(--text-light);
      display: none;
      padding-left: 16px;
      border-left: 2px solid var(--accent-cyan);
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    /* 联系 */
    .contact-row {
      display: flex;
      gap: 40px;
      margin-top: 48px;
    }

    .contact-form {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 18px;
    }

    .glass-input {
      background: rgba(20,20,50,0.45);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 12px;
      padding: 14px 18px;
      color: white;
      outline: none;
      transition: 0.2s;
    }

    .glass-input:focus {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 12px rgba(0,240,255,0.3);
    }

    .info-card {
      flex: 1;
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border-radius: var(--card-radius-lg);
      padding: 32px;
      border: 1px solid var(--glass-border);
    }

    /* 页脚 */
    .footer {
      border-top: 2px solid;
      border-image: linear-gradient(90deg, #FF6FD8, #00F0FF) 1;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 30px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .side-nav {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      .main-content {
        margin-left: 0;
        padding-top: 56px;
      }
      .hero-grid {
        flex-direction: column;
      }
      .highlights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .wide-card {
        grid-column: span 2;
      }
    }

    @media (max-width: 768px) {
      .cases-masonry {
        column-count: 1;
      }
      .compare-panel {
        flex-direction: column;
      }
      .compare-divider {
        width: 100%;
        height: 2px;
        margin: 20px 0;
      }
      .contact-row {
        flex-direction: column;
      }
      .hero-title {
        font-size: 2.5rem;
      }
    }