/* =======================
   VARIABLES CSS
======================= */
:root {
    --primary-color: #28a745;
    --primary-hover: #218838;
    --text-color: #333;
    --text-color-light: #444;
    --border-radius: 8px;
    --input-padding: 10px 14px;
    --transition-speed: 0.3s;
    --section-title-font: 1.6rem;
    --section-subtitle-font: 1.1rem;
    --gap: 20px;
}

/* =======================
   CONTENEDOR DEL FORMULARIO
======================= */
.form-container {
    background: #fff;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    margin-bottom: 50px;
}

/* =======================
   TÍTULOS DE SECCIONES
======================= */
.form-section-title {
    background-color: var(--primary-color);
    color: #fff;
    padding: 14px 20px;
    border-radius: var(--border-radius);
    text-align: center;
    margin: 40px 0;
    width: 100%;
    font-size: var(--section-title-font);
    font-weight: 700;
}

.form-section-subtitle {
    background-color: var(--primary-color);
    color: #fff;
    padding: 8px 15px;
    border-radius: calc(var(--border-radius) - 2px);
    text-align: center;
    margin: 30px auto;
    width: 50%;
    font-weight: 600;
    font-size: var(--section-subtitle-font);
}

/* =======================
   INPUTS Y SELECTS
======================= */
.form-control,
.form-select {
    border-radius: var(--border-radius);
    padding: var(--input-padding);
    border: 1px solid #ccc;
    transition: all 0.2s ease-in-out;
    font-size: 0.95rem;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
    outline: none;
}

/* =======================
   LABELS
======================= */
/* Labels principales de inputs */
label.form-label {
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 6px;
    display: block;
}

/* Opciones de radios y checkboxes */
.form-check-label {
    margin-left: 6px;
    font-weight: 400; /* normal */
    color: var(--text-color-light);
}

/* =======================
   BOTÓN SUBMIT
======================= */
.btn-submit {
    background-color: var(--primary-color);
    border: none;
    border-radius: var(--border-radius);
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
    transition: all var(--transition-speed) ease;
    cursor: pointer;
}

.btn-submit:hover,
.btn-submit:focus {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

/* Botón responsive para móviles */
@media (max-width: 576px) {
    .btn-submit {
        width: 100%;
    }
}

/* =======================
   GRUPOS Y MARGENES
======================= */
.form-group {
    margin-bottom: var(--gap);
}

/* =======================
   ESTADOS DE ERROR / VALIDACIÓN
======================= */
.form-control.is-invalid,
.form-select.is-invalid {
    border-color: #dc3545;
    box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}

/* =======================
   SECCIONES COLAPSABLES
======================= */
/* Transición suave del contenido */
.collapse-smooth {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.collapse.show.collapse-smooth {
    max-height: 1000px; /* suficiente para cualquier contenido */
}

/* Flecha SVG giratoria */
.collapse-btn .collapse-icon {
    transition: transform 0.3s ease;
}

button[aria-expanded="true"] .collapse-icon {
    transform: rotate(180deg);
}

/* Ajuste hover/focus para el botón collapse */
.collapse-btn:hover .collapse-icon,
.collapse-btn:focus .collapse-icon {
    color: var(--primary-color);
}

/* Contenido collapse con fondo y borde */
.collapse {
    background-color: #f9f9f9;
    border: 1px solid #ddd;
    padding: 1rem;
    border-radius: var(--border-radius);
}

/* Opciones de radio/check hover */
.form-check-input:focus + .form-check-label,
.form-check-input:hover + .form-check-label {
    color: var(--text-color);
    font-weight: 500;
    cursor: pointer;
}