:root {
    --primary-color: #007bff;
    --light-gray: #f4f7f9;
    --dark-gray: #333;
    --medium-gray: #6c757d;
    --white: #ffffff;
    --red-error: #dc3545;
    --red-error-bg: #f8d7da;
    --border-color: #e9ecef; /* Borde para modo claro */
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--light-gray);
    color: var(--dark-gray);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1rem;
}

.container {
    background-color: var(--white);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    text-align: center;
    width: 100%;
    max-width: 450px;
}

h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--medium-gray);
    margin-bottom: 2rem;
}

.rate-card {
    margin-top: 1.5rem;
}

.currency-group {
    margin-bottom: 1.5rem;
}

.currency {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--medium-gray);
}

.rate-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0.25rem 0;
}

.update-time {
    font-size: 0.85rem;
    color: var(--medium-gray);
    margin-top: 2rem;
}

/* Estilos para los mensajes flash */
.flash-error {
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 8px;
    color: var(--red-error);
    background-color: var(--red-error-bg);
    border: 1px solid var(--red-error);
}

.update-link, .secondary-link {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s ease, transform 0.2s ease;
    margin-top: 1rem;
}

.update-link {
    background-color: var(--primary-color);
    color: var(--white);
}

.secondary-link {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.update-link:hover, .secondary-link:hover {
    background-color: #0056b3;
    color: var(--white);
    transform: translateY(-2px);
}

.button-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Estilos para el spinner de carga */
.spinner {
    border: 4px solid rgba(0, 0, 0, 0.1);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border-left-color: var(--primary-color); /* Color del spinner */
    animation: spin 1s ease infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* --- Dark Mode Variables --- */
body[data-theme="dark"] {
    --light-gray: #121212; /* Fondo oscuro */
    --white: #1e1e1e;      /* Fondo de la tarjeta oscuro */
    --dark-gray: #e0e0e0;   /* Texto claro */
    --medium-gray: #888;
    --primary-color: #4dabf7; /* Un azul más claro para el modo oscuro */
    --red-error-bg: #572e31;
    --red-error: #f8d7da;
    --border-color: #343a40; /* Borde para modo oscuro */
}

/* --- Estilos para el Interruptor de Tema --- */
.theme-switch-wrapper {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    margin-bottom: -2rem; /* Ajuste para posicionarlo arriba */
    position: relative;
    z-index: 10;
}

.theme-switch {
    display: inline-block;
    height: 24px;
    position: relative;
    width: 48px;
}

.theme-switch input {
    display:none;
}

.slider {
    background-color: #ccc;
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    background-color: #fff;
    bottom: 4px;
    content: "";
    height: 16px;
    left: 4px;
    position: absolute;
    transition: .4s;
    width: 16px;
    border-radius: 50%;
}

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

input:checked + .slider:before {
    transform: translateX(24px);
}

/* --- Estilos para la Calculadora --- */
.calculator-card {
    background-color: var(--light-gray); /* Fondo sutilmente diferente */
    border-radius: 12px;
    padding: 20px;
    margin-top: 25px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.calculator-card h3 {
    margin-top: 0;
    margin-bottom: 15px;
    text-align: center;
    color: var(--dark-gray);
}

.calculator-input-group {
    display: flex;
    gap: 10px;
    flex-direction: column; /* Apila los elementos verticalmente */
    align-items: center;
    justify-content: center;
}

.calculator-options {
    display: flex;
    gap: 15px; /* Espacio entre los dos grupos de botones */
    justify-content: center;
    align-items: center;
    margin-top: 10px; /* Espacio arriba, separándolo del input */
}

.calculator-input-group label {
    font-weight: 600;
    color: var(--dark-gray);
}

.calculator-input-group input {
    flex-grow: 1;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--white); /* El fondo del input debe ser el de la tarjeta */
    color: var(--dark-gray);
    font-size: 1rem;
    max-width: 120px; /* Evita que el input sea demasiado grande */
}

.calculator-input-group button {
    padding: 10px 15px;
    border: none;
    background-color: var(--primary-color);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

.calculator-input-group button:hover {
    opacity: 0.85;
}

.calculation-result {
    margin-top: 15px;
    font-size: 1.1rem;
    color: var(--dark-gray);
    min-height: 25px; /* Evita que el layout salte */
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px; /* Espacio entre el texto y el botón de copiar */
    flex-wrap: wrap; /* Permite que el botón pase abajo en pantallas pequeñas */
}

.result-value {
    color: var(--primary-color);
}

/* Estilos para el selector de moneda en la calculadora del BCV */
.currency-selector {
    display: flex;
    gap: 10px;
    align-items: center;
}

.currency-selector input[type="radio"] {
    display: none; /* Ocultamos el radio button por defecto */
}

.currency-selector label {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s, color 0.3s;
    font-weight: 600;
}

/* Estilo para el label del radio button seleccionado */
.currency-selector input[type="radio"]:checked + label {
    background-color: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

/* Estilo para el botón de copiar */
.copy-btn {
    padding: 5px 10px;
    font-size: 0.8rem;
    font-weight: 600;
    border: 1px solid var(--primary-color);
    background-color: transparent;
    color: var(--primary-color);
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s, color 0.3s;
}

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