/**
 * ABAS
 * Navegação por abas (Entradas, Saídas, Próximas, Adicionar)
 */

/* Grade fixa: "+ Lançamento" ocupa a linha; Receitas | Despesas | Próximas dividem */
.tabs {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.tab-btn {
    padding: 0.55rem 0.4rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: background var(--transition-normal), color var(--transition-normal), border-color var(--transition-normal);
    white-space: nowrap;
    text-align: center;
}

.tab-btn:hover { color: var(--text); }

/* Selecionado: preenchido + outline (sem traço/underline) */
.tab-btn.active {
    background: color-mix(in srgb, var(--primary) 14%, var(--surface));
    border-color: var(--primary);
    color: var(--primary);
    font-weight: var(--font-weight-semibold);
    outline: 2px solid var(--primary);
    outline-offset: -1px;
}

.tabs [data-tab="adicionar"] { order: -1; grid-column: 1 / -1; }
.tabs [data-tab="entradas"] { order: 1; }
.tabs [data-tab="saidas"]   { order: 2; }
.tabs [data-tab="proximas"] { order: 3; }
.tabs [data-tab="revisao"]  { order: 4; }

/* Conteúdo das abas */
.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
    min-height: 300px;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Indicador de aba ativa */
.tab-indicator {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    margin-left: var(--spacing-sm);
    background: var(--primary);
    color: white;
    border-radius: 50%;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
}

/* Badges nas abas */
.tab-badge {
    display: inline-block;
    background: var(--danger);
    color: white;
    border-radius: 12px;
    padding: 0.2rem 0.6rem;
    font-size: var(--font-size-sm);
    margin-left: var(--spacing-sm);
}

.tab-badge.info {
    background: var(--primary);
}

.tab-badge.success {
    background: var(--success);
}

.tab-badge.warning {
    background: var(--warning);
}

/* Icones nas abas (opcional) */
.tab-icon {
    margin-right: var(--spacing-sm);
    font-size: var(--font-size-lg);
}

/* Estado loading */
.tab-content.loading {
    opacity: 0.6;
    pointer-events: none;
}

.tab-content.loading::after {
    content: '⏳ Carregando...';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    white-space: nowrap;
}

/* Scroll behavior */
.tabs::-webkit-scrollbar {
    height: 4px;
}

.tabs::-webkit-scrollbar-thumb {
    background: var(--gray);
}

/* Breakpoints */
@media (max-width: 768px) {
    .tabs {
        gap: 0;
        border-bottom: 1px solid var(--light);
    }

    .tab-btn {
        padding: var(--spacing-md) var(--spacing-md);
        font-size: var(--font-size-sm);
        flex: 1;
        text-align: center;
    }

    .tab-btn.active {
        border-bottom-width: 2px;
    }
}

@media (max-width: 480px) {
    .tab-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.85rem;
    }

    .tab-badge {
        display: none;
    }

    .tab-content {
        min-height: 200px;
    }
}

/* Transição suave entre abas */
@media (prefers-reduced-motion: no-preference) {
    .tab-content {
        transition: opacity 0.3s ease;
    }
}

/* Modo dark (futuro) */