:root {
    --carta-radio: 12px;
    --carta-borde: #198754;
}

body {
    min-height: 100vh;
}

/* Cuadrícula responsiva del tablero */
.tablero-wrapper {
    padding-inline: 12px;
}

.tablero {
    display: grid;
    gap: 12px;
    grid-template-columns: repeat(auto-fill, minmax(88px, 1fr));
    max-width: 720px;
    margin: 0 auto;
}

/* Móviles grandes */
@media (min-width: 576px) {
    .tablero {
        grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
        max-width: 760px;
    }
}

/* Tablets (iPad Air 11" vertical ~820px) */
@media (min-width: 768px) {
    .tablero {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        max-width: 900px;
    }
}

/* Tablets/pantallas grandes (iPad Air 11" horizontal ~1180px) */
@media (min-width: 992px) {
    .tablero {
        grid-template-columns: repeat(auto-fill, minmax(125px, 1fr));
        max-width: 1140px;
        gap: 14px;
    }
}

@media (min-width: 1400px) {
    .tablero {
        max-width: 1320px;
    }
}

/* Carta con efecto flip 3D */
.carta {
    position: relative;
    aspect-ratio: 3 / 4;
    perspective: 1000px;
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.carta-inner {
    position: absolute;
    inset: 0;
    transform-style: preserve-3d;
    transition: transform 0.45s ease;
    border-radius: var(--carta-radio);
}

.carta.volteada .carta-inner,
.carta.emparejada .carta-inner {
    transform: rotateY(180deg);
}

.carta-cara {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: var(--carta-radio);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

/* Reverso (visible por defecto) */
.carta-reverso {
    background: linear-gradient(135deg, #198754, #0d5c3a);
    color: rgba(255, 255, 255, 0.85);
    font-size: 2rem;
    border: 3px solid #ffffff33;
}

/* Frente (visible al voltear) */
.carta-frente {
    transform: rotateY(180deg);
    background: #fff;
    border: 3px solid var(--carta-borde);
    flex-direction: column;
    padding: 6px;
    text-align: center;
}

.carta-frente img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 8px;
}

/* Cara de texto (nombre + periodo) para la variante B */
.carta-texto {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
}

.carta-texto .nombre {
    font-weight: 700;
    font-size: 0.85rem;
    line-height: 1.1;
    color: #0d5c3a;
}

.carta-texto .periodo {
    font-size: 0.75rem;
    color: #6c757d;
}

/* Carta emparejada */
.carta.emparejada {
    animation: pop 0.4s ease;
}

.carta.emparejada .carta-cara {
    border-color: #ffc107;
    box-shadow: 0 0 0 3px rgba(255, 193, 7, 0.5);
}

.carta.bloqueada {
    pointer-events: none;
}

@keyframes pop {
    0%   { transform: scale(1); }
    50%  { transform: scale(1.06); }
    100% { transform: scale(1); }
}

/* --- Transición de logro (variante A) --- */
.logro-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(13, 92, 58, 0.35);
    backdrop-filter: blur(2px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    z-index: 1080;
    transition: opacity 0.25s ease, visibility 0.25s ease;
}

.logro-overlay.mostrar {
    opacity: 1;
    visibility: visible;
}

.logro-card {
    display: flex;
    align-items: center;
    gap: 16px;
    background: #fff;
    border: 3px solid #ffc107;
    border-radius: 16px;
    padding: 16px 24px 16px 16px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
    transform: scale(0.7) translateY(10px);
    transition: transform 0.35s cubic-bezier(0.18, 0.89, 0.32, 1.28);
    max-width: 90vw;
}

.logro-overlay.mostrar .logro-card {
    transform: scale(1) translateY(0);
}

.logro-badge {
    position: absolute;
    margin-top: -70px;
    margin-left: 6px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: #ffc107;
    color: #0d5c3a;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.25);
    animation: badge-bounce 0.6s ease;
}

.logro-card img {
    width: 84px;
    height: 108px;
    object-fit: cover;
    border-radius: 10px;
    border: 2px solid #198754;
    flex-shrink: 0;
}

.logro-titulo {
    font-size: 0.8rem;
    font-weight: 600;
    color: #ffc107;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.logro-nombre {
    font-size: 1.25rem;
    font-weight: 800;
    color: #0d5c3a;
    line-height: 1.15;
}

.logro-periodo {
    font-size: 0.95rem;
    color: #6c757d;
}

@keyframes badge-bounce {
    0%   { transform: scale(0) rotate(-30deg); }
    60%  { transform: scale(1.25) rotate(10deg); }
    100% { transform: scale(1) rotate(0); }
}