/* roulang page: index */
:root {
      --primary: #0A1A3F;
      --accent-cyan: #00E5FF;
      --accent-orange: #FF6B35;
      --surface-glass: rgba(255,255,255,0.05);
      --surface-hover: rgba(255,255,255,0.08);
      --text-main: #FFFFFF;
      --text-body: #B0C4DE;
      --text-muted: #8899AA;
      --border-glow: rgba(0,229,255,0.2);
      --border-hover: rgba(0,229,255,0.5);
      --radius-card: 20px;
      --radius-small: 14px;
      --radius-btn: 50px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4), 0 0 0 1px rgba(0,229,255,0.08) inset;
      --shadow-hover: 0 16px 48px rgba(0,229,255,0.15);
      --font-head: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-mono: 'SF Mono', 'Menlo', 'Consolas', monospace;
    }

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

    body {
      font-family: var(--font-body);
      background-color: #051020;
      color: var(--text-body);
      line-height: 1.8;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: var(--accent-cyan);
      transition: color 0.25s ease;
    }

    a:hover {
      color: var(--accent-orange);
    }

    h1, h2, h3, h4 {
      font-family: var(--font-head);
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 1rem;
    }

    h1 {
      font-size: clamp(2.5rem, 5vw, 4rem);
    }

    h2 {
      font-size: 2.2rem;
      margin-bottom: 1.5rem;
    }

    h3 {
      font-size: 1.4rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
    }

    .section-padding {
      padding: 120px 0;
    }

    @media (max-width: 1024px) {
      .section-padding {
        padding: 80px 0;
      }
    }

    @media (max-width: 640px) {
      .section-padding {
        padding: 60px 0;
      }
      h1 {
        font-size: 2.2rem;
      }
      h2 {
        font-size: 1.8rem;
      }
    }

    /* 导航栏 - 悬浮胶囊 */
    .main-header {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: 90%;
      max-width: 600px;
      z-index: 100;
      background: rgba(10,26,63,0.75);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
      border: 1px solid var(--border-glow);
      border-radius: 60px;
      padding: 8px 8px;
    }

    .nav-capsule {
      display: flex;
      justify-content: space-between;
      align-items: center;
      list-style: none;
      margin: 0;
      padding: 0;
      flex-wrap: wrap;
      gap: 4px;
    }

    .nav-capsule li a {
      display: block;
      padding: 8px 16px;
      border-radius: 50px;
      color: var(--text-body);
      font-weight: 500;
      font-size: 0.95rem;
      transition: all 0.25s;
      white-space: nowrap;
    }

    .nav-capsule li a.active,
    .nav-capsule li a:hover {
      background: rgba(0,229,255,0.2);
      color: var(--accent-cyan);
      box-shadow: 0 0 12px rgba(0,229,255,0.3);
    }

    @media (max-width: 640px) {
      .main-header {
        top: auto;
        bottom: 12px;
        width: 95%;
        max-width: 100%;
        padding: 6px 8px;
        border-radius: 60px;
        background: rgba(10,26,63,0.85);
        backdrop-filter: blur(25px);
        -webkit-backdrop-filter: blur(25px);
      }
      .nav-capsule {
        justify-content: space-around;
        gap: 2px;
      }
      .nav-capsule li a {
        padding: 8px 10px;
        font-size: 0.8rem;
        text-align: center;
      }
    }

    /* Hero区域 */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background: radial-gradient(circle at 20% 20%, #0A1A3F, #051020);
      overflow: hidden;
    }

    .hero-bg-layer {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
      opacity: 0.25;
      z-index: 0;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      width: 100%;
      padding: 2rem 0;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 4rem;
      flex-wrap: wrap;
    }

    .hero-left {
      flex: 1 1 500px;
    }

    .hero-right {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
    }

    .glass-visual {
      width: 100%;
      height: 400px;
      background: rgba(10,26,63,0.5);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--border-glow);
      border-radius: 32px;
      box-shadow: var(--shadow-card);
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
    }

    .glass-visual::before {
      content: "";
      position: absolute;
      width: 200px;
      height: 200px;
      background: radial-gradient(circle, rgba(0,229,255,0.2) 0%, transparent 70%);
      border-radius: 50%;
      top: 20%;
      right: 10%;
      filter: blur(30px);
    }

    .data-circles {
      display: flex;
      gap: 30px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .circle-pulse {
      width: 80px;
      height: 80px;
      border-radius: 50%;
      background: rgba(0,229,255,0.08);
      border: 2px solid rgba(0,229,255,0.4);
      display: flex;
      align-items: center;
      justify-content: center;
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--accent-cyan);
      box-shadow: 0 0 25px rgba(0,229,255,0.25);
    }

    .btn-primary-glow {
      background: linear-gradient(135deg, #00E5FF 0%, #0088CC 100%);
      color: #0A1A3F;
      font-weight: 700;
      border: none;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      box-shadow: 0 0 30px rgba(0,229,255,0.5), 0 4px 12px rgba(0,0,0,0.3);
      transition: all 0.3s;
      display: inline-block;
      text-align: center;
      cursor: pointer;
    }

    .btn-primary-glow:hover {
      box-shadow: 0 0 50px rgba(0,229,255,0.8);
      transform: scale(1.05);
      color: #0A1A3F;
    }

    .btn-secondary-glass {
      background: transparent;
      border: 2px solid rgba(0,229,255,0.5);
      color: var(--accent-cyan);
      border-radius: var(--radius-btn);
      padding: 12px 34px;
      backdrop-filter: blur(10px);
      font-weight: 600;
      transition: all 0.3s;
      display: inline-block;
    }

    .btn-secondary-glass:hover {
      border-color: var(--accent-cyan);
      background: rgba(0,229,255,0.1);
      box-shadow: 0 0 20px rgba(0,229,255,0.3);
      color: var(--accent-cyan);
    }

    /* 卡片系统 */
    .glass-card {
      background: rgba(10,26,63,0.6);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.35s cubic-bezier(0.23, 1, 0.32, 1);
      padding: 2rem;
      height: 100%;
    }

    .glass-card:hover {
      transform: translateY(-6px);
      border-color: var(--border-hover);
      box-shadow: var(--shadow-hover);
    }

    @media (max-width: 640px) {
      .glass-card:hover {
        transform: none;
      }
      .glass-card:active {
        border-color: var(--border-hover);
        background: rgba(0,229,255,0.08);
      }
    }

    .stat-number {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 2.8rem;
      color: var(--accent-orange);
      line-height: 1.2;
    }

    .accent-dot {
      display: inline-block;
      width: 8px;
      height: 8px;
      background: var(--accent-cyan);
      border-radius: 50%;
      margin-right: 10px;
      box-shadow: 0 0 12px var(--accent-cyan);
    }

    .faq-accordion .accordion-title {
      background: rgba(255,255,255,0.03);
      border-bottom: 1px solid var(--border-glow);
      padding: 18px 24px;
      font-weight: 600;
      color: var(--text-main);
      font-size: 1.1rem;
    }

    .faq-accordion .accordion-title:hover {
      background: rgba(0,229,255,0.05);
    }

    .faq-accordion .is-active .accordion-title {
      color: var(--accent-cyan);
      background: rgba(0,229,255,0.05);
    }

    .faq-accordion .accordion-content {
      padding: 20px 24px;
      color: var(--text-body);
      background: rgba(10,26,63,0.4);
      border-bottom: 1px solid var(--border-glow);
    }

    footer {
      background: #051020;
      border-top: 1px solid var(--accent-cyan);
      padding-top: 3rem;
    }

    .footer-links a {
      color: var(--text-muted);
      display: block;
      margin-bottom: 0.5rem;
    }

    .social-icon {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: rgba(255,255,255,0.05);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-cyan);
      margin-right: 10px;
      transition: 0.2s;
    }

    .social-icon:hover {
      background: var(--accent-cyan);
      color: #0A1A3F;
    }