/* Definição de variáveis de cor para o tema claro (padrão) */
:root {
    --bg-color: #f0f2f5;
    --card-bg-color: #ffffff;
    --text-color: #212529;
    --label-color: #343a40;
    --muted-text-color: #6c757d;
    --border-color: #dee2e6;
    --input-bg-color: #fff;
    --btn-primary-bg: #007bff;
    --btn-primary-hover: #0056b3;
    --link-color: #007bff;
    --toggle-link-color: #007bff;
    --control-button-bg: #e9ecef;
    --control-button-border: #ced4da;
    --control-button-text: #495057;
    --control-button-hover-bg: #dee2e6;
    --switch-track-color: #ccc;
}

/* Definição de variáveis para o tema escuro */
[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --card-bg-color: #2b2b2b;
    --text-color: #e0e0e0;
    --label-color: #f8f9fa;
    --muted-text-color: #adb5bd;
    --border-color: #444;
    --input-bg-color: #3a3a3a;
    --btn-primary-bg: #0d6efd;
    --btn-primary-hover: #0a58ca;
    --link-color: #8ab4f8;
    --toggle-link-color: #8ab4f8;
    --control-button-bg: #3a3a3a;
    --control-button-border: #555;
    --control-button-text: #e0e0e0;
    --control-button-hover-bg: #4a4a4a;
    --switch-track-color: #555;
}

body {
    background-color: var(--bg-color);
    font-family: 'Poppins', sans-serif;
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

.calculator-card {
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    transition: all 0.3s ease-in-out;
}

.card-title {
    color: var(--text-color);
}

.card-subtitle.text-muted {
    color: var(--muted-text-color) !important;
}

.form-label {
    color: var(--label-color);
    font-weight: 500;
}

.text-muted {
    color: var(--muted-text-color) !important;
}

a {
    color: var(--link-color);
    text-decoration: none;
}

.toggle-link {
    color: var(--toggle-link-color);
    font-weight: 500;
}

.form-control {
    background-color: var(--input-bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-primary {
    background-color: var(--btn-primary-bg);
    border-color: var(--btn-primary-bg);
}

.btn-primary:hover {
    background-color: var(--btn-primary-hover);
    border-color: var(--btn-primary-hover);
}

/* --- Controles de Tema e Idioma --- */
.controls-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding: 0 10px;
}

/* Seletor de Idiomas com Bandeiras */
.language-switcher {
    display: flex;
    gap: 8px;
}

.language-switcher .lang-btn {
    background: var(--control-button-bg);
    border: 1px solid var(--control-button-border);
    border-radius: 8px;
    font-size: 1.4rem;
    cursor: pointer;
    opacity: 0.6;
    transition: all 0.2s ease-in-out;
    padding: 5px 10px;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.language-switcher .lang-btn img {
    width: 32px;
    /* Define uma largura fixa para o container da imagem */
    height: 24px;
    /* Define uma altura fixa */
    object-fit: contain;
    /* Garante que a imagem se ajuste dentro do container sem distorcer */
    display: block;
}

.language-switcher .lang-btn.active {
    opacity: 1;
    border-color: var(--btn-primary-bg);
    box-shadow: 0 0 0 2px rgba(var(--btn-primary-bg), 0.2);
}

.language-switcher .lang-btn:hover {
    opacity: 0.8;
    background-color: var(--control-button-hover-bg);
}

/* --- NOVO: Estilo para o Seletor de Tema (Switch) --- */
.theme-switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--switch-track-color);
    transition: .4s;
    border-radius: 34px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 5px;
}

.slider-icon {
    color: #f0c400;
    /* Cor do ícone de sol */
    transition: .4s;
}

.slider-icon.moon {
    color: #f0f2f5;
    /* Cor do ícone de lua */
}

/* O "knob" do switch */
.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
    z-index: 2;
}

input:checked+.slider {
    background-color: var(--btn-primary-bg);
}

input:checked+.slider:before {
    transform: translateX(26px);
}

/* Esconde ícone de sol quando não está checado (tema claro) */
input:not(:checked)+.slider .slider-icon.sun {
    opacity: 0;
}

/* Esconde ícone de lua quando está checado (tema escuro) */
input:checked+.slider .slider-icon.moon {
    opacity: 0;
}