:root {
    --pn-primary: #0d6efd;
    --pn-primary-hover: #0a58ca;
    --pn-bg: #f0f2f5;
    --pn-radius: 12px;
    --pn-shadow: 0 4px 20px rgba(0,0,0,0.05);
    --pn-toast-bg: #198754; /* Verde éxito */
}

body {
    font-family: system-ui, -apple-system, sans-serif;
    background-color: var(--pn-bg);
    color: #2c3e50;
    padding-bottom: 80px; /* Espacio para el toast si es necesario */
}

/* 📐 Contenedor y Tarjetas */
.container { max-width: 800px; padding: 1.5rem 1rem; }
.card {
    border: none;
    border-radius: var(--pn-radius);
    box-shadow: var(--pn-shadow);
    background: #fff;
    margin-bottom: 1.5rem;
    overflow: hidden;
}
.card-body { padding: 1.5rem; }

/* 📝 Formulario: Alineación Estricta */
.form-section-title {
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #6c757d;
    font-weight: 700;
    margin-bottom: 1rem;
    border-bottom: 2px solid #e9ecef;
    padding-bottom: 0.5rem;
}

.form-group { margin-bottom: 1.2rem; }

/* Labels claros */
.form-label {
    font-weight: 600;
    font-size: 0.9rem;
    color: #495057;
    margin-bottom: 0.4rem;
    display: block; /* Fuerza bloque completo */
}

/* Inputs y Selects idénticos */
.form-control, .form-select {
    border: 1px solid #dee2e6;
    border-radius: 8px;
    padding: 0.6rem 0.8rem;
    font-size: 1rem;
    background-color: #fff;
    width: 100%; /* Asegura ancho completo */
    box-shadow: none !important; /* Quitar sombra default de BS */
    transition: border-color 0.2s;
}

.form-control:focus, .form-select:focus {
    border-color: var(--pn-primary);
    box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.15) !important;
}

/* Textarea especial */
textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

/* Contadores de caracteres */
.char-counter {
    text-align: right;
    font-size: 0.75rem;
    color: #adb5bd;
    margin-top: 0.2rem;
}

/* 🔘 Botones */
.btn-primary {
    background-color: var(--pn-primary);
    border: none;
    border-radius: 8px;
    padding: 0.7rem 1.5rem;
    font-weight: 600;
    width: 100%; /* Móvil: ancho completo */
}
.btn-outline-secondary {
    border-radius: 8px;
    width: 100%; /* Móvil: ancho completo */
    margin-bottom: 0.5rem;
}

@media (min-width: 576px) {
    .btn-primary { width: auto; }
    .btn-outline-secondary { width: auto; margin-bottom: 0; margin-right: 0.5rem; }
    .d-flex-buttons { flex-direction: row; }
}

/* 📤 Resultado */
#resultCard { border-left: 4px solid var(--pn-primary); }
pre {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 8px;
    white-space: pre-wrap;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    color: #212529;
}

/* 🍞 Toast Flotante (Imposible de ignorar) */
.toast-container {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9999;
    width: 90%;
    max-width: 400px;
    text-align: center;
}

.custom-toast {
    background-color: #212529; /* Oscuro para contraste */
    color: #fff;
    border-radius: 50px; /* Forma de píldora */
    padding: 0.8rem 1.5rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    font-size: 0.95rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* Icono de check animado simple */
.check-icon { color: #4cd964; font-weight: bold; }