/**
 * VARIATION SELECTOR MODAL CSS
 * Ajedrez de Silicio - v1_INITIAL
 * 
 * Modal elegante para seleccionar entre variantes al navegar el PGN
 * Diseño: Dorado/Negro/Rojo con animaciones suaves
 */

/* ===== CONTENEDOR PRINCIPAL DEL MODAL ===== */

/* Overlay sutil detrás del modal */
.variation-modal-overlay {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    background: transparent !important;
    z-index: 49999 !important;
    pointer-events: none !important; /* No bloquear interacción con tablero */
}

.variation-modal-overlay.blocking {
    pointer-events: auto !important;
    cursor: not-allowed !important;
    touch-action: none !important;
    overscroll-behavior: contain !important;
}

.variation-modal-overlay.hidden {
    display: none !important;
}

.variation-modal {
    position: fixed !important;
    z-index: 50000 !important;
    background: var(--theme-modal-bg) !important;
    border: 2px solid var(--theme-accent-primary) !important;
    border-radius: 8px !important;
    padding: 16px !important;
    min-width: 320px !important;
    max-width: 450px !important;
    box-shadow: 0 8px 32px var(--theme-shadow-glow),
                0 0 60px var(--theme-shadow-glow) !important;
    animation: fadeInScale 0.2s ease-out !important;
    backdrop-filter: blur(4px) !important;
    transition: all var(--transition-theme) !important;
}

.variation-modal.hidden {
    display: none !important;
}

/* ===== HEADER DEL MODAL ===== */

.variation-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--theme-border);
    transition: border-color var(--transition-theme);
}

.variation-modal-title-group {
    display: flex;
    flex-direction: column;
    gap: 2px;
    color: var(--theme-accent-primary);
    font-weight: bold;
    font-size: 15px;
    line-height: 1.2;
    transition: color var(--transition-theme);
}

.variation-modal-title {
    font-size: 15px;
}

.variation-modal-hint {
    font-size: 11px;
    color: var(--theme-text-muted);
    font-weight: normal;
    font-style: italic;
    transition: color var(--transition-theme);
}

.variation-modal-close {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 1px solid var(--theme-border);
    background: var(--theme-input-bg);
    color: var(--theme-accent-primary);
    font-size: 18px;
    line-height: 1;
    cursor: pointer;
    transition: all var(--transition-theme);
}

.variation-modal-close:hover {
    background: var(--theme-bg-tertiary);
    border-color: var(--theme-accent-primary);
    color: var(--theme-accent-primary);
    filter: brightness(1.2);
}

.variation-modal-close:focus-visible {
    outline: 2px solid var(--theme-accent-primary);
    outline-offset: 2px;
}

/* ===== CONTENEDOR DE OPCIONES ===== */

.variation-modal-options {
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-height: 400px;
    overflow-y: auto;
    padding-right: 4px;
}

/* Scrollbar elegante para opciones largas */
.variation-modal-options::-webkit-scrollbar {
    width: 6px;
}

.variation-modal-options::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 3px;
}

.variation-modal-options::-webkit-scrollbar-thumb {
    background: var(--theme-accent-primary);
    border-radius: 3px;
    transition: background var(--transition-theme);
}

.variation-modal-options::-webkit-scrollbar-thumb:hover {
    background: var(--theme-accent-primary);
    filter: brightness(1.2);
}

/* Firefox */
.variation-modal-options {
    scrollbar-width: thin;
    scrollbar-color: var(--theme-accent-primary) var(--theme-shadow);
}

/* ===== OPCIONES DE VARIANTES ===== */

.variation-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    margin: 0;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-theme);
    color: var(--theme-accent-primary);
    background: var(--theme-input-bg);
    border: 2px solid transparent;
    user-select: none;
}

/* Hover state */
.variation-option:hover {
    background: var(--theme-bg-tertiary);
    border-color: var(--theme-border);
    transform: translateX(3px);
}

/* Selected state (con teclado) */
.variation-option.selected {
    background: var(--theme-button-hover);
    color: var(--theme-button-text-hover);
    font-weight: bold;
    border-color: var(--theme-accent-primary);
    box-shadow: 0 4px 12px var(--theme-shadow-glow);
}

/* Estado especial para línea principal */
.variation-option.mainline {
    border-left: 4px solid var(--theme-accent-primary);
}

.variation-option.mainline .variation-icon {
    color: var(--theme-accent-primary);
    text-shadow: 0 0 8px var(--theme-shadow-glow);
}

/* Selected + mainline */
.variation-option.selected.mainline .variation-icon {
    color: var(--theme-button-text-hover);
    text-shadow: none;
}

/* ===== ELEMENTOS INTERNOS DE LAS OPCIONES ===== */

.variation-icon {
    font-size: 20px;
    width: 28px;
    min-width: 28px;
    text-align: center;
    line-height: 1;
}

.variation-move {
    font-family: 'Courier New', monospace;
    font-size: 17px;
    font-weight: bold;
    min-width: 70px;
    letter-spacing: 0.5px;
}

.variation-label {
    font-size: 13px;
    opacity: 0.85;
    font-style: italic;
    flex-grow: 1;
}

/* Cambio de color del label cuando está seleccionado */
.variation-option.selected .variation-label {
    opacity: 1;
    font-weight: 600;
}

/* ===== ANIMACIONES ===== */

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.92) translateY(-10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* Animación al aparecer cada opción (staggered) */
.variation-option {
    animation: slideInOption 0.2s ease-out backwards;
}

.variation-option:nth-child(1) { animation-delay: 0.02s; }
.variation-option:nth-child(2) { animation-delay: 0.04s; }
.variation-option:nth-child(3) { animation-delay: 0.06s; }
.variation-option:nth-child(4) { animation-delay: 0.08s; }
.variation-option:nth-child(5) { animation-delay: 0.10s; }
.variation-option:nth-child(n+6) { animation-delay: 0.12s; }

@keyframes slideInOption {
    from {
        opacity: 0;
        transform: translateX(-15px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ===== RESPONSIVE DESIGN ===== */

@media (max-width: 480px) {
    .variation-modal {
        min-width: 280px;
        max-width: 90vw;
        padding: 12px;
    }
    
    .variation-option {
        padding: 10px 12px;
        gap: 8px;
    }
    
    .variation-move {
        font-size: 15px;
        min-width: 60px;
    }
    
    .variation-label {
        font-size: 12px;
    }
}

/* ===== MÓVILES HORIZONTALES ===== */
@media (max-width: 768px) and (orientation: landscape) {
    .variation-modal {
        min-width: 260px !important;
        max-width: 320px !important;
        padding: 12px !important;
    }
    
    .variation-modal-header {
        margin-bottom: 10px !important;
        padding-bottom: 8px !important;
        gap: 10px !important;
    }
    
    .variation-modal-title {
        font-size: 13px !important;
    }
    
    .variation-modal-hint {
        font-size: 10px !important;
    }
    
    .variation-modal-close {
        width: 24px !important;
        height: 24px !important;
        font-size: 16px !important;
    }
    
    .variation-modal-options {
        max-height: 300px !important;
        gap: 5px !important;
    }
    
    .variation-option {
        padding: 10px 12px !important;
        gap: 10px !important;
    }
    
    .variation-icon {
        font-size: 18px !important;
        width: 24px !important;
        min-width: 24px !important;
    }
    
    .variation-move {
        font-size: 15px !important;
        min-width: 65px !important;
    }
    
    .variation-label {
        font-size: 11px !important;
    }
}

/* ===== ACCESIBILIDAD ===== */

.variation-option:focus {
    outline: 2px solid var(--theme-accent-primary);
    outline-offset: 2px;
}

/* Indicador visual cuando el modal está activo */
.variation-modal::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    border-radius: 10px;
    background: linear-gradient(45deg, var(--theme-accent-primary), var(--theme-accent-primary), var(--theme-accent-primary));
    background-size: 200% 200%;
    animation: borderGlow 3s ease infinite;
    z-index: -1;
    opacity: 0.3;
}

@keyframes borderGlow {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}