/* roulang page: index */
:root {
      --deep-blue: #0A1A3A;
      --electric-cyan: #00E5FF;
      --vibrant-orange: #FF6B35;
      --bg-darkest: #060F1F;
      --bg-card: #0D1B36;
      --bg-panel: #112240;
      --text-light-title: #FFFFFF;
      --text-light-body: #B8C7E0;
      --text-light-muted: #7B8FAB;
      --text-dark-title: #0A1A3A;
      --text-dark-body: #2C3E5A;
      --text-dark-muted: #5A6F8C;
      --light-bg: #F0F4FA;
      --glass-bg: rgba(13, 27, 54, 0.7);
      --glass-border: rgba(0, 229, 255, 0.15);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-number: 'DIN Alternate', 'PingFang SC', sans-serif;
    }

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

    body {
      font-family: var(--font-title);
      background-color: var(--bg-darkest);
      color: var(--text-light-body);
      line-height: 1.7;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease, opacity 0.2s ease;
    }

    button, input {
      font-family: inherit;
      outline: none;
      border: none;
      background: none;
    }

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

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(6, 15, 31, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.15);
      z-index: 50;
      padding: 12px 0;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }

    .logo {
      font-size: 22px;
      font-weight: 800;
      background: linear-gradient(135deg, #00E5FF, #FFFFFF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -0.02em;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo i {
      background: none;
      -webkit-text-fill-color: var(--electric-cyan);
      font-size: 24px;
    }

    .search-box {
      display: flex;
      align-items: center;
      background: var(--bg-card);
      border: 1px solid rgba(0, 229, 255, 0.2);
      border-radius: 50px;
      padding: 8px 18px;
      width: 340px;
      transition: border 0.2s;
    }

    .search-box:focus-within {
      border-color: var(--electric-cyan);
      box-shadow: 0 0 12px rgba(0, 229, 255, 0.3);
    }

    .search-box input {
      background: transparent;
      color: white;
      width: 100%;
      font-size: 14px;
    }

    .search-box input::placeholder {
      color: var(--text-light-muted);
    }

    .search-box i {
      color: var(--electric-cyan);
      font-size: 16px;
      margin-left: 8px;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-light-body);
    }

    .nav-links a {
      position: relative;
      padding-bottom: 4px;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--electric-cyan);
      transition: width 0.25s ease;
    }

    .nav-links a:hover {
      color: white;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .mobile-menu-btn {
      display: none;
      font-size: 24px;
      color: var(--electric-cyan);
      cursor: pointer;
    }

    /* Hero */
    .hero-section {
      background: linear-gradient(180deg, #060F1F 0%, #0A1A3A 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 80px;
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .hero-text {
      flex: 1 1 55%;
    }

    .hero-image {
      flex: 1 1 45%;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0, 229, 255, 0.15);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 420px;
      position: relative;
    }

    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(10, 26, 58, 0.25);
    }

    h1 {
      font-size: clamp(36px, 5vw, 54px);
      font-weight: 800;
      letter-spacing: -0.02em;
      background: linear-gradient(to right, #00E5FF, #ffffff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1.2;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: #B8C7E0;
      margin-bottom: 32px;
      max-width: 500px;
    }

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

    .btn-primary {
      background: linear-gradient(135deg, #FF6B35, #FF3D00);
      color: white;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: 50px;
      font-size: 16px;
      box-shadow: 0 6px 18px rgba(255, 107, 53, 0.4);
      transition: all 0.25s;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      box-shadow: 0 0 28px rgba(255, 107, 53, 0.7);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--electric-cyan);
      color: var(--electric-cyan);
      padding: 14px 32px;
      border-radius: 50px;
      font-weight: 600;
      transition: all 0.25s;
      display: inline-block;
    }

    .btn-outline:hover {
      background: rgba(0, 229, 255, 0.1);
      border-color: white;
      color: white;
    }

    /* 板块通用 */
    .section {
      padding: 100px 0;
    }

    .section-light {
      background-color: var(--light-bg);
      color: var(--text-dark-body);
    }

    .section-dark {
      background-color: var(--bg-darkest);
    }

    h2 {
      font-size: 32px;
      font-weight: 700;
      letter-spacing: -0.02em;
      margin-bottom: 16px;
      color: var(--text-light-title);
    }

    .section-light h2 {
      color: var(--text-dark-title);
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--text-light-muted);
      margin-bottom: 48px;
    }

    .section-light .section-subtitle {
      color: var(--text-dark-muted);
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .card-glass {
      background: var(--glass-bg);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-card);
    }

    .card-glass:hover {
      transform: translateY(-6px);
      border-color: rgba(0, 229, 255, 0.5);
      box-shadow: 0 16px 40px rgba(0, 229, 255, 0.15);
    }

    .pain-card {
      border-left: 4px solid rgba(255, 80, 80, 0.7);
    }

    .pain-card:hover {
      border-left-color: var(--electric-cyan);
    }

    .icon-large {
      font-size: 42px;
      color: var(--electric-cyan);
      margin-bottom: 20px;
    }

    .number-highlight {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      background: linear-gradient(135deg, #00E5FF, #FF6B35);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .faq-item {
      background: rgba(13, 27, 54, 0.5);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      overflow: hidden;
      border: 1px solid transparent;
      transition: border 0.2s;
    }

    .faq-item.active {
      border-color: rgba(0, 229, 255, 0.4);
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: white;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      padding: 0 24px;
      color: #B8C7E0;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    .cta-full {
      background: #060F1F;
      text-align: center;
      padding: 80px 0;
      position: relative;
      background-image: radial-gradient(circle at center, rgba(0,229,255,0.08) 0%, transparent 70%);
    }

    footer {
      background: #0A1A3A;
      padding: 60px 0 30px;
      color: #B8C7E0;
    }

    @media (max-width: 1024px) {
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .navbar {
        padding: 10px 0;
      }
      .nav-container {
        flex-direction: column;
        align-items: stretch;
      }
      .search-box {
        width: 100%;
        margin: 12px 0;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
        position: absolute;
        right: 24px;
        top: 18px;
      }
      .hero-grid {
        flex-direction: column;
      }
      .hero-image {
        min-height: 280px;
        width: 100%;
      }
      .grid-3 {
        grid-template-columns: 1fr;
      }
      h1 {
        font-size: 32px;
      }
      .section {
        padding: 70px 0;
      }
    }