/* Top Banner Bar */
.bnu-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif !important;
  font-size: 15px;
  line-height: 1.5;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 999999;
  display: none;
  opacity: 0;
  transform: translateY(-100%);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.bnu-bar.bnu-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Content Wrapper */
.bnu-content-wrapper {
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  justify-content: space-between;
  max-width: 1400px;
  margin: 0 auto;
}

/* Content Area */
.bnu-content {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 1;
}

/* Icon */
.bnu-icon {
  font-size: 28px;
  flex-shrink: 0;
  animation: bnu-pulse 2s ease-in-out infinite;
}

@keyframes bnu-pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.1);
    opacity: 0.9;
  }
}

/* Message */
.bnu-text {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  flex: 1;
}

.bnu-message {
  font-size: 15px;
  line-height: 1.5;
  font-weight: 500;
  flex: 1;
  min-width: 250px;
}

/* Update Button */
.bnu-download-link {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
  padding: 10px 24px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  transition: all 0.2s ease;
  border: 1.5px solid rgba(255, 255, 255, 0.4);
  white-space: nowrap;
  backdrop-filter: blur(10px);
}

.bnu-download-link:hover {
  background: rgba(255, 255, 255, 0.3);
  border-color: rgba(255, 255, 255, 0.6);
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.bnu-download-link:active {
  transform: translateY(0);
}

/* Close Button */
.bnu-close {
  background: rgba(255, 255, 255, 0.15);
  border: none;
  color: #fff;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
  padding: 0;
  border-radius: 50%;
  transition: all 0.2s ease;
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 300;
}

.bnu-close:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: rotate(90deg);
}

/* Powered By */
.bnu-powered-by {
  font-size: 11px;
  opacity: 0.85;
  flex-shrink: 0;
}

.bnu-powered-by a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  font-weight: 500;
  transition: opacity 0.2s ease;
}

.bnu-powered-by a:hover {
  opacity: 1;
  text-decoration: underline;
}

/* Body Adjustment */
body.bnu-body-adjusted {
  padding-top: 70px;
  transition: padding-top 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .bnu-content-wrapper {
    padding: 14px 18px;
    flex-direction: column;
    gap: 12px;
    align-items: stretch;
  }

  .bnu-content {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .bnu-icon {
    font-size: 32px;
  }

  .bnu-text {
    flex-direction: column;
    gap: 12px;
  }

  .bnu-message {
    font-size: 14px;
    min-width: auto;
  }

  .bnu-download-link {
    width: 100%;
    text-align: center;
  }

  .bnu-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 32px;
    height: 32px;
    font-size: 20px;
  }

  .bnu-powered-by {
    text-align: center;
    font-size: 10px;
  }

  body.bnu-body-adjusted {
    padding-top: 140px;
  }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
  .bnu-bar {
    background: linear-gradient(135deg, #1e3a8a 0%, #581c87 100%);
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  .bnu-bar,
  .bnu-download-link,
  .bnu-close,
  body.bnu-body-adjusted {
    transition: none;
  }

  .bnu-icon {
    animation: none;
  }

  .bnu-close:hover {
    transform: none;
  }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  .bnu-bar {
    background: #000;
    border-bottom: 3px solid #fff;
  }

  .bnu-download-link {
    background: #fff;
    color: #000;
    border-color: #fff;
  }
}

/* Reset */
.bnu-bar * {
  box-sizing: border-box !important;
}