:root {
    --font-family: 'Open Sans', sans-serif;
    --font-weight-normal: 400;
    --font-weight-bold: 600;
    --font-size-body: 14px;
    --font-size-label: 14px;
    --font-size-input: 16px;
    --font-size-header: 24px;
    --font-size-paragraph: 14px;
    --font-size-error: 12px;

    /* Colors - Esquema Azul Profesional */
    --color-background: #f8fafc;
    --color-card-bg: #ffffff;
    --color-card-border: #e2e8f0;
    --color-card-shadow: rgba(15, 23, 42, 0.08);
    --color-header: #1e293b;
    --color-label: #374151;
    --color-input-border: #d1d5db;
    --color-input-text: #374151;
    --color-focus-border: #2563eb;
    --color-submit-btn-bg: #2563eb;
    --color-submit-btn-text: #ffffff;
    --color-error: #dc2626;
    --color-required: #dc2626;
    --color-success: #059669;
    --color-submit-btn-hover: #1d4ed8;
    --color-input-focus-bg: #f8fafc;

    /* Border Radii */
    --border-radius-card: 12px;
    --border-radius-input: 8px;
    --border-radius-submit-btn: 8px;

    /* Spacing */
    --padding-container-top: 32px;
    --padding-card: 32px;
    --margin-bottom-card: 20px;
    --padding-form-input: 16px;
    --gap-form-groups: 24px;

    /* Dimensions */
    --container-width: 600px;
    --submit-btn-height: 52px;
    --input-min-height: 48px;

    /* Shadows y efectos */
    --box-shadow-card: 0px 4px 20px 0px var(--color-card-shadow);
    --box-shadow-input-focus: 0 0 0 3px rgba(37, 99, 235, 0.1);
    --transition-all: all 0.2s ease-in-out;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--color-background);
    color: var(--color-input-text);
    line-height: 1.6;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: var(--padding-container-top) 20px;
}

.form-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-radius: var(--border-radius-card);
    box-shadow: var(--box-shadow-card);
    padding: var(--padding-card);
    margin-bottom: var(--margin-bottom-card);
}

.form-header {
    text-align: center;
    margin-bottom: 32px;
}

.form-logo {
    max-width: 176px;
    height: auto;
    margin-bottom: 16px;
}

.form-title {
    font-size: var(--font-size-header);
    font-weight: var(--font-weight-bold);
    color: var(--color-header);
    margin-bottom: 8px;
}

.form-description {
    font-size: var(--font-size-paragraph);
    color: #64748b;
}

.progress-bar {
    width: 100%;
    height: 4px;
    background-color: #e2e8f0;
    border-radius: 2px;
    margin-bottom: 32px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--color-submit-btn-bg);
    border-radius: 2px;
    transition: width 0.3s ease;
    width: 0%;
}

.step {
    display: none;
}

.step.active {
    display: block;
    animation: slideIn 0.3s ease;
}

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

.form-group {
    margin-bottom: var(--gap-form-groups);
}

.form-label {
    display: block;
    font-size: var(--font-size-label);
    font-weight: var(--font-weight-bold);
    color: var(--color-label);
    margin-bottom: 8px;
}

.required {
    color: var(--color-required);
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    min-height: var(--input-min-height);
    padding: var(--padding-form-input);
    border: 1px solid var(--color-input-border);
    border-radius: var(--border-radius-input);
    font-size: var(--font-size-input);
    color: var(--color-input-text);
    background-color: var(--color-card-bg);
    transition: var(--transition-all);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--color-focus-border);
    box-shadow: var(--box-shadow-input-focus);
    background-color: var(--color-input-focus-bg);
}

.form-textarea {
    min-height: 100px;
    resize: vertical;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

/* Reducir el espacio vertical sólo para la fila de Bultos/Palets */
#bultos_palets_row {
    row-gap: 8px; /* más pegado al texto de ayuda */
    margin-bottom: var(--gap-form-groups); /* conserva el espaciado estándar hacia el siguiente campo */
}

#bultos_palets_row .form-group {
    margin-bottom: 0; /* elimina espacio extra inferior de los grupos */
}

#bultos_palets_row small {
    display: block;
    margin-top: 4px; /* reduce aún más la separación superior */
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

.button-group {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-top: 32px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius-submit-btn);
    font-size: var(--font-size-input);
    font-weight: var(--font-weight-bold);
    cursor: pointer;
    transition: var(--transition-all);
    min-height: var(--submit-btn-height);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--color-submit-btn-bg);
    border: 1px solid var(--color-submit-btn-bg);
}

.btn-secondary:hover {
    background-color: var(--color-submit-btn-bg);
    color: var(--color-submit-btn-text);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.error-message {
    color: var(--color-error);
    font-size: var(--font-size-error);
    margin-top: 4px;
}

.scenario-card {
    border: 2px solid var(--color-input-border);
    border-radius: var(--border-radius-input);
    padding: 20px;
    margin-bottom: 16px;
    cursor: pointer;
    transition: var(--transition-all);
}

.scenario-card:hover {
    border-color: var(--color-focus-border);
    box-shadow: var(--box-shadow-input-focus);
}

.scenario-card.selected {
    border-color: var(--color-focus-border);
    background-color: var(--color-input-focus-bg);
}

.scenario-title {
    font-weight: var(--font-weight-bold);
    color: var(--color-header);
    margin-bottom: 8px;
}

.scenario-description {
    color: #64748b;
    font-size: 14px;
}

.success-message {
    text-align: center;
    color: var(--color-success);
}

/* Centrar botones dentro de mensajes de éxito/error */
.success-message .btn {
    margin-left: auto;
    margin-right: auto;
}

.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid #e2e8f0;
    border-top: 2px solid var(--color-submit-btn-bg);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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