/* Contenedor principal: ocupa toda la pantalla y se adapta */
.checador-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh; /* siempre ocupa el alto completo */
    padding: 1rem; /* margen interno para no pegarse a los bordes */
    background-color: #f5f5f5; /* color de fondo general */
    box-sizing: border-box;
    overflow-y: auto; /* si se excede, aparece scroll */
}

/* Tarjeta central */
.checador-card {
    width: 100%;
    max-width: 400px; /* ancho máximo en portrait */
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Header */
.checador-header {
    text-align: center;
    margin-bottom: 1rem;
}

    .checador-header h2 {
        margin: 0.5rem 0;
    }

.subtitle {
    font-size: 0.9rem;
    color: #666;
}

.instruction {
    font-size: 0.85rem;
    color: #444;
}

/* Display del PIN */
.pin-display {
    font-size: 1.5rem;
    margin: 1rem 0;
    letter-spacing: 0.5rem;
}

.pin-placeholder {
    color: #aaa;
}

.pin-value {
    color: #222;
}

/* Keypad */
.keypad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    width: 100%;
    margin-bottom: 1rem;
}

.key-btn {
    padding: 1rem;
    font-size: 1.2rem;
    border: none;
    border-radius: 8px;
    background-color: #e0e0e0;
    cursor: pointer;
    transition: background-color 0.2s;
}

    .key-btn:hover {
        background-color: #d5d5d5;
    }

.action-btn {
    background-color: #ffcccc;
}

    .action-btn.backspace {
        background-color: #ffe0b2;
    }

/* Botón de validar */
.validate-btn {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    border: none;
    border-radius: 8px;
    background-color: #4caf50;
    color: #fff;
    cursor: pointer;
    transition: background-color 0.2s;
}

    .validate-btn:hover {
        background-color: #43a047;
    }

/* Mensaje de error */
.error-msg {
    margin-top: 0.75rem;
    color: #d32f2f;
    font-size: 0.9rem;
    text-align: center;
}

/* Footer */
.checador-footer {
    margin-top: 1rem;
    font-size: 0.75rem;
    color: #888;
    text-align: center;
}

/* Ajustes en landscape */
@media (orientation: landscape) {
    .checador-card {
        max-width: 600px; /* más ancho en horizontal */
        padding: 2rem;
    }

    .keypad {
        gap: 1rem;
    }
}