.app-startup {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    overflow: auto;
    background: linear-gradient(135deg, #1a1d23 0%, #2a2d35 100%);
    color: #f0f0f0;
    text-align: center;
}

.app-startup-content {
    width: 100%;
    max-width: 440px;
    margin: auto;
}

.app-startup-title {
    margin: 0 0 12px;
    font-size: clamp(1.3rem, 4vw, 1.75rem);
    font-weight: 600;
    line-height: 1.4;
}

.app-startup-message {
    margin: 0;
    color: #9ca3af;
    font-size: 1rem;
    line-height: 1.6;
}

.app-startup-spinner {
    width: 48px;
    height: 48px;
    margin: 0 auto 24px;
    border: 4px solid #4a4d55;
    border-top-color: #f08000;
    border-radius: 50%;
    animation: app-startup-spin 1s linear infinite;
}

.app-startup-retry {
    margin-top: 24px;
    padding: 10px 24px;
    border: 1px solid #5a5d65;
    border-radius: 8px;
    background: #2a2d35;
    color: #ffffff;
    cursor: pointer;
}

.app-startup-retry:hover { background: #3a3d45; }
.app-startup-retry:focus-visible {
    outline: 2px solid #f08000;
    outline-offset: 3px;
}

@keyframes app-startup-spin {
    to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
    .app-startup-spinner { animation: none; }
}