/* =====================================================
   Encuesta Congreso Internacional - Estilos
   Paleta alineada con la portada (fondo oscuro, azul, cyan, dorado)
   ===================================================== */

:root {
    /* Colores de la portada: oscuro, azul teal, cyan, amarillo/dorado */
    --edu-bg-dark: #0c0f14;
    --edu-bg-card: #132238;
    --edu-bg-card-hover: #1a2d47;
    --edu-primary: #2a8ecb;
    --edu-primary-dark: #1e6ba8;
    --edu-primary-light: #51b9e0;
    --edu-secondary: #38bdf8;
    --edu-accent: #fbbf24;
    --edu-accent-alt: #f59e0b;
    --edu-text: #f1f5f9;
    --edu-text-muted: #94a3b8;
    --edu-border: #334155;
    --edu-border-light: #475569;
    --edu-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --edu-radius: 12px;
    --edu-radius-lg: 20px;
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-head: 'Outfit', var(--font-body);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background: var(--edu-bg-dark);
    color: var(--edu-text);
    line-height: 1.6;
    min-height: 100vh;
}

/* Header con link al portal */
.congreso-header {
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.75rem;
    background: var(--edu-bg-card);
    border-bottom: 1px solid var(--edu-border);
}
.congreso-header h1 {
    font-family: var(--font-head);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--edu-text);
}
.congreso-header a.portal-link {
    color: var(--edu-primary-light);
    text-decoration: none;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}
.congreso-header a.portal-link:hover { color: var(--edu-accent); text-decoration: underline; }

/* Contenedor principal */
.congreso-wrap {
    max-width: 640px;
    margin: 0 auto;
    padding: 2rem 1.25rem 3rem;
}

.congreso-hero {
    text-align: center;
    margin-bottom: 2rem;
}
.congreso-hero .icon-hero {
    width: 56px;
    height: 56px;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, var(--edu-primary), var(--edu-secondary));
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.5rem;
}
.congreso-hero h2 {
    font-family: var(--font-head);
    font-size: 1.75rem;
    color: var(--edu-text);
    margin-bottom: 0.5rem;
}
.congreso-hero p {
    color: var(--edu-text-muted);
    font-size: 1rem;
}

/* Portada del congreso (imagen con información del evento) */
.congreso-portada-wrap {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 1.5rem 1.25rem 0;
}
.congreso-portada-img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--edu-radius-lg);
    box-shadow: var(--edu-shadow);
    border: 1px solid var(--edu-border-light);
    object-fit: contain;
    background: var(--edu-bg-dark);
}
.congreso-hero-simple {
    margin-bottom: 1.5rem;
}
.congreso-hero-cta {
    text-align: center;
    font-size: 1.1rem;
    color: var(--edu-primary-light);
    font-weight: 500;
    margin: 0;
}

/* Tarjeta del formulario */
.congreso-card {
    background: var(--edu-bg-card);
    border-radius: var(--edu-radius-lg);
    box-shadow: var(--edu-shadow);
    padding: 2rem;
    border: 1px solid var(--edu-border);
}

/* Grupos de campos */
.form-group {
    margin-bottom: 1.35rem;
}
.form-group label {
    display: block;
    font-weight: 500;
    color: var(--edu-text);
    margin-bottom: 0.4rem;
    font-size: 0.95rem;
}
.form-group label .req { color: var(--edu-accent); }
.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--edu-border);
    border-radius: var(--edu-radius);
    font-size: 1rem;
    font-family: inherit;
    background: var(--edu-bg-dark);
    color: var(--edu-text);
    transition: border-color 0.2s, box-shadow 0.2s;
}
.form-group input::placeholder {
    color: var(--edu-text-muted);
}
.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--edu-primary-light);
    box-shadow: 0 0 0 3px rgba(42, 142, 203, 0.25);
}
.form-group input.error,
.form-group select.error { border-color: #ef4444; }
.form-group select option {
    background: var(--edu-bg-card);
    color: var(--edu-text);
}

/* Tipo usuario "Otro" */
.form-group .otro-wrap {
    margin-top: 0.6rem;
    display: none;
}
.form-group .otro-wrap.visible { display: block; }

/* Fechas: tarjetas seleccionables */
.fecha-label-text { font-weight: 600; font-size: 1rem; }
.fechas-opciones {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.fecha-option {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    border: 2px solid var(--edu-border);
    border-radius: var(--edu-radius);
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    background: var(--edu-bg-dark);
}
.fecha-option:hover { border-color: var(--edu-primary-light); background: var(--edu-bg-card-hover); }
.fecha-option.selected {
    border-color: var(--edu-primary);
    background: rgba(42, 142, 203, 0.2);
    box-shadow: 0 0 0 1px var(--edu-primary);
}
.fecha-option input[type="radio"] {
    margin-top: 0.2rem;
    accent-color: var(--edu-accent);
    width: 1.1rem;
    height: 1.1rem;
}
.fecha-option .fecha-text { flex: 1; color: var(--edu-text); }
.fecha-option .fecha-text strong { color: var(--edu-primary-light); }

.otra-fecha-wrap {
    margin-top: 0.75rem;
    display: none;
}
.otra-fecha-wrap.visible { display: block; }
.otra-fecha-wrap input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--edu-border);
    border-radius: var(--edu-radius);
    font-size: 1rem;
    background: var(--edu-bg-dark);
    color: var(--edu-text);
}

/* Botón enviar (azul + toque dorado como en la portada) */
.btn-submit {
    width: 100%;
    padding: 1rem 1.5rem;
    font-size: 1.05rem;
    font-weight: 600;
    color: #fff;
    background: linear-gradient(135deg, var(--edu-primary), var(--edu-primary-dark));
    border: 1px solid var(--edu-primary-light);
    border-radius: var(--edu-radius);
    cursor: pointer;
    margin-top: 0.5rem;
    transition: transform 0.2s, box-shadow 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}
.btn-submit:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 6px 24px rgba(42, 142, 203, 0.4);
    background: linear-gradient(135deg, var(--edu-primary-light), var(--edu-primary));
}
.btn-submit:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* Mensaje de confirmación (legacy) */
.congreso-success {
    text-align: center;
    padding: 2.5rem 1.5rem;
}
.congreso-success .icon-ok {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.25rem;
    background: linear-gradient(135deg, var(--edu-accent), var(--edu-accent-alt));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--edu-bg-dark);
    font-size: 2rem;
}
.congreso-success h2 { color: var(--edu-text); margin-bottom: 0.5rem; }
.congreso-success p { color: var(--edu-text-muted); }
.congreso-success a { color: var(--edu-primary-light); }

/* Pantalla de agradecimiento al finalizar encuesta */
.congreso-gracias-pantalla {
    text-align: center;
    padding: 2rem 1.25rem 3rem;
    max-width: 560px;
    margin: 0 auto;
}
.congreso-gracias-imagen-wrap {
    margin-top: 1.5rem;
    margin-bottom: 1.5rem;
}
.congreso-gracias-imagen {
    width: 100%;
    max-width: 400px;
    height: auto;
    display: block;
    margin: 0 auto;
    border-radius: var(--edu-radius-lg);
    box-shadow: var(--edu-shadow);
    border: 1px solid var(--edu-border);
}
.congreso-gracias-mensaje {
    margin-bottom: 2rem;
}
.congreso-gracias-mensaje h2 {
    font-family: var(--font-head);
    font-size: 1.75rem;
    color: var(--edu-text);
    margin-bottom: 1rem;
}
.congreso-gracias-mensaje p {
    color: var(--edu-text-muted);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}
.congreso-gracias-cierre {
    margin-top: 1rem !important;
    font-weight: 600;
    color: var(--edu-accent) !important;
}
.congreso-gracias-cerrar-aviso {
    font-size: 0.9rem;
    color: var(--edu-text-muted);
    margin-top: 1.5rem;
}

/* Indicador de carga */
.loader-overlay {
    position: fixed;
    inset: 0;
    background: rgba(12, 15, 20, 0.9);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}
.loader-overlay.visible { display: flex; }
.loader-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--edu-border);
    border-top-color: var(--edu-primary-light);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Mensaje de error (caja) */
.congreso-msg-error {
    margin-bottom: 1rem;
    border-left: 4px solid #f87171;
}
.congreso-msg-error p {
    color: #fca5a5;
    margin: 0;
}

/* Mensajes de error en formulario (texto bajo campo) */
.form-error {
    color: #f87171;
    font-size: 0.875rem;
    margin-top: 0.35rem;
}

/* Responsive */
@media (max-width: 600px) {
    .congreso-wrap { padding: 1.25rem 1rem 2rem; }
    .congreso-card { padding: 1.5rem; }
    .congreso-hero h2 { font-size: 1.5rem; }
}