/* Tela de boot: mesmo desenho do LoadingOverlay do Navigate.UI (anel, ícone e mensagem trocando, trilha de etapas). */
.app-loading {
    --app-brand: #2563eb;
    --app-brand-soft: #eff6ff;
    --app-surface: #ffffff;
    --app-text: #1f2937;
    --app-text-muted: #6b7280;
    --app-track: #e2e8f0;
    --app-step: 3s;
    --app-steps: 4;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: var(--app-surface);
    font-family: "Inter", -apple-system, "Segoe UI", Roboto, sans-serif;
}
.app-loading__content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    width: min(100%, 22rem);
    text-align: center;
}
.app-loading__spinner {
    position: relative;
    width: 5rem;
    height: 5rem;
}
.app-loading__spinner::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 0.25rem solid var(--app-brand-soft);
    border-top-color: var(--app-brand);
    animation: app-loading-spin 1.8s linear infinite;
}
.app-loading__icon {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    color: var(--app-brand);
    opacity: 0;
    animation: app-loading-fade calc(var(--app-step) * var(--app-steps)) ease-in-out infinite;
    animation-delay: calc(var(--i) * var(--app-step));
}
.app-loading__icon svg {
    width: 1.875rem;
    height: 1.875rem;
}
.app-loading__hint {
    position: relative;
    min-height: 1.5rem;
    width: 100%;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--app-text);
}
.app-loading__hint span {
    position: absolute;
    left: 0;
    right: 0;
    white-space: nowrap;
    opacity: 0;
    animation: app-loading-fade calc(var(--app-step) * var(--app-steps)) ease-in-out infinite;
    animation-delay: calc(var(--i) * var(--app-step));
}
.app-loading__hint span::after {
    content: "";
    animation: app-loading-dots 2s steps(4, end) infinite;
}
.app-loading__track {
    display: flex;
    gap: 0.25rem;
}
.app-loading__track i {
    position: relative;
    width: 1.25rem;
    height: 0.25rem;
    border-radius: 999px;
    background: var(--app-track);
    overflow: hidden;
}
.app-loading__track i::after {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--app-brand);
    transform: scaleX(0);
    transform-origin: left;
    animation: app-loading-fill calc(var(--app-step) * var(--app-steps)) linear infinite;
    animation-delay: calc(var(--i) * var(--app-step));
}
.app-loading__brand {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--app-text-muted);
}
.app-loading__retry {
    font: 600 0.95rem/1 "Inter", -apple-system, "Segoe UI", Roboto, sans-serif;
    color: #fff;
    background: var(--app-brand);
    border: 1px solid var(--app-brand);
    border-radius: 0.625rem;
    padding: 0.65rem 1.5rem;
    cursor: pointer;
}
.app-loading__retry:hover {
    background: #1d4ed8;
}
.app-loading__retry:disabled {
    opacity: 0.6;
    cursor: default;
}
@keyframes app-loading-spin {
    to { transform: rotate(360deg); }
}
@keyframes app-loading-fade {
    0% { opacity: 0; transform: translateY(0.375rem); }
    5%, 22% { opacity: 1; transform: translateY(0); }
    27%, 100% { opacity: 0; transform: translateY(-0.25rem); }
}
@keyframes app-loading-fill {
    0% { transform: scaleX(0); }
    25%, 100% { transform: scaleX(1); }
}
@keyframes app-loading-dots {
    0% { content: ""; }
    25% { content: "."; }
    50% { content: ".."; }
    75% { content: "..."; }
}
@media (prefers-reduced-motion: reduce) {
    .app-loading__spinner::before,
    .app-loading__track i::after,
    .app-loading__hint span::after {
        animation: none;
    }
    .app-loading__icon,
    .app-loading__hint span {
        animation: none;
    }
    .app-loading__icon:first-child,
    .app-loading__hint span:first-child {
        opacity: 1;
    }
}