/* roulang page: index */
:root {
      --bg-deep: #0B0F19;
      --cyan: #00F0FF;
      --violet: #7B61FF;
      --text-primary: #E0E0E0;
      --text-secondary: #8890A0;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --card-radius: 16px;
      --btn-radius: 50px;
      --shadow-default: 0 4px 20px rgba(0,0,0,0.4);
      --shadow-cyan: 0 12px 32px rgba(0,240,255,0.15);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(11, 15, 25, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.1);
      z-index: 50;
      display: flex;
      align-items: center;
    }
    .nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: radial-gradient(circle at 30% 30%, var(--cyan), #0B4F6C);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 18px;
      box-shadow: 0 0 14px rgba(0,240,255,0.5);
    }
    .logo-text {
      font-weight: 700;
      font-size: 1.25rem;
      letter-spacing: 0.5px;
      color: white;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-size: 0.95rem;
      font-weight: 500;
      color: #ccc;
    }
    .nav-links a {
      color: #ccc;
      transition: 0.2s;
    }
    .nav-links a:hover {
      color: var(--cyan);
    }
    .nav-cta {
      background: linear-gradient(135deg, var(--cyan), var(--violet));
      padding: 8px 22px;
      border-radius: var(--btn-radius);
      color: white !important;
      font-weight: 600;
      box-shadow: 0 0 12px rgba(0,240,255,0.4);
    }
    .nav-cta:hover {
      box-shadow: 0 0 24px rgba(0,240,255,0.7);
    }
    /* 移动端菜单按钮 */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }
    /* Hero 分屏 */
    .hero-section {
      min-height: 90vh;
      display: flex;
      align-items: center;
      padding-top: 64px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: rgba(11,15,25,0.75);
      backdrop-filter: blur(2px);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-left h1 {
      font-size: clamp(2.4rem, 5vw, 3.8rem);
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.2rem;
      color: white;
    }
    .hero-left .subtitle {
      font-size: 1.1rem;
      color: #B0B8C5;
      margin-bottom: 2rem;
      max-width: 90%;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--cyan), var(--violet));
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--btn-radius);
      border: none;
      cursor: pointer;
      transition: 0.25s;
      box-shadow: 0 4px 16px rgba(0,240,255,0.3);
      display: inline-block;
    }
    .btn-primary:hover {
      box-shadow: 0 0 28px rgba(0,240,255,0.7);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.25);
      color: white;
      font-weight: 500;
      padding: 14px 32px;
      border-radius: var(--btn-radius);
      cursor: pointer;
      transition: 0.25s;
    }
    .btn-outline:hover {
      border-color: var(--cyan);
      background: rgba(0,240,255,0.05);
    }
    .hero-right {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .visual-mock {
      width: 100%;
      aspect-ratio: 1 / 1;
      background: rgba(255,255,255,0.02);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
      background-image: url('/assets/images/coverpic/cover-1.webp');
      background-size: cover;
      background-position: center;
    }
    .badge-row {
      display: flex;
      gap: 20px;
      margin-top: 32px;
      flex-wrap: wrap;
    }
    .badge {
      background: var(--glass-bg);
      backdrop-filter: blur(15px);
      border: 1px solid var(--glass-border);
      border-radius: 40px;
      padding: 8px 18px;
      font-size: 0.9rem;
      color: #ddd;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .badge i { color: var(--cyan); }
    /* 通用板块 */
    .section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: white;
    }
    .section-sub {
      color: var(--cyan);
      font-size: 0.9rem;
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 48px;
    }
    .gradient-line {
      width: 40px;
      height: 2px;
      background: linear-gradient(90deg, var(--cyan), var(--violet));
    }
    /* 功能卡片 */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      padding: 32px;
      transition: 0.3s;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      border-color: rgba(0,240,255,0.3);
      box-shadow: var(--shadow-cyan);
    }
    .metric {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--cyan);
      line-height: 1.1;
    }
    .feature-name {
      font-size: 1.3rem;
      font-weight: 600;
      margin: 12px 0 8px;
    }
    .feature-desc {
      color: var(--text-secondary);
      font-size: 0.95rem;
    }
    .text-link {
      color: var(--cyan);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      margin-top: 16px;
    }
    /* 场景 */
    .scenario-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      margin-bottom: 64px;
    }
    .scenario-img {
      background: #131A2B;
      border-radius: 20px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.08);
    }
    .tag {
      background: rgba(123,97,255,0.2);
      color: #c4b5ff;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
    }
    /* 案例横向滚动 */
    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
    }
    .case-card {
      min-width: 280px;
      background: #131A2B;
      border-radius: var(--card-radius);
      padding: 24px;
      border: 1px solid rgba(255,255,255,0.05);
      transition: 0.2s;
    }
    .case-card:hover {
      border-color: var(--cyan);
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: rgba(255,255,255,0.02);
      border-radius: 14px;
      padding: 18px;
      border-left: 3px solid var(--cyan);
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      color: #b0b8c5;
      font-size: 0.9rem;
      margin-top: 12px;
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-block {
      background: #080C16;
      text-align: center;
      padding: 80px 24px;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0 40px;
      border-top: 1px solid rgba(255,255,255,0.05);
    }
    @media (max-width: 1024px) {
      .feature-grid { grid-template-columns: repeat(2,1fr); }
      .faq-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      .hero-left .subtitle { max-width: 100%; }
      .badge-row { justify-content: center; }
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .feature-grid { grid-template-columns: 1fr; }
      .scenario-row { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }