* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: radial-gradient(circle at top, #1e293b 0, #0f172a 45%, #020617 100%);
    color: #fff;
    min-height: 100vh;
    padding: 20px;
}

.page {
    max-width: 1180px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 24px;
    align-items: start;
}

.card {
    background: rgba(30, 41, 59, 0.96);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 24px;
    padding: 24px;
    box-shadow: 0 22px 70px rgba(0,0,0,0.35);
}

.badge {
    display: inline-block;
    background: rgba(34,197,94,0.12);
    border: 1px solid rgba(34,197,94,0.28);
    color: #bbf7d0;
    padding: 8px 12px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: bold;
    margin-bottom: 14px;
}

h1 {
    margin: 0 0 8px;
    font-size: 34px;
}

.subtitle {
    color: #cbd5e1;
    line-height: 1.5;
    margin-bottom: 18px;
}

.controls {
    display: grid;
    grid-template-columns: 1fr 160px;
    gap: 12px;
    margin-bottom: 14px;
}

.controls select,
.controls button {
    width: 100%;
    border: none;
    border-radius: 14px;
    padding: 14px;
    font-weight: bold;
}

.controls select {
    background: #0f172a;
    color: #fff;
    border: 1px solid rgba(255,255,255,0.08);
}

.controls button {
    background: #22c55e;
    color: #fff;
    cursor: pointer;
}

.controls button:hover {
    background: #16a34a;
}

.scorebar {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 14px;
}

.scorebar div {
    background: #0f172a;
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 16px;
    padding: 14px;
    text-align: center;
}

.scorebar span {
    display: block;
    color: #94a3b8;
    font-size: 13px;
    margin-bottom: 6px;
}

.scorebar strong {
    font-size: 24px;
}

.status {
    background: #020617;
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 14px;
    padding: 14px;
    color: #cbd5e1;
    font-weight: bold;
    margin-bottom: 18px;
}

.memory-board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.memory-card {
    aspect-ratio: 1 / 1;
    border: none;
    border-radius: 18px;
    cursor: pointer;
    background: #020617;
    color: #fff;
    padding: 10px;
    perspective: 900px;
}

.card-inner {
    width: 100%;
    height: 100%;
    position: relative;
    transition: transform .42s ease;
    transform-style: preserve-3d;
}

.memory-card.open .card-inner,
.memory-card.matched .card-inner {
    transform: rotateY(180deg);
}

.card-face {
    position: absolute;
    inset: 0;
    border-radius: 16px;
    backface-visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 10px;
    font-weight: bold;
}

.card-back {
    background: linear-gradient(145deg, #22c55e, #15803d);
    font-size: 34px;
}

.card-front {
    background: linear-gradient(145deg, #1e293b, #0f172a);
    border: 1px solid rgba(255,255,255,0.08);
    transform: rotateY(180deg);
    flex-direction: column;
    gap: 8px;
}

.card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 12px;
}

.card-emoji {
    font-size: 34px;
}

.card-name {
    font-size: 14px;
    color: #e2e8f0;
}

.memory-card.matched .card-front {
    border-color: rgba(34,197,94,0.65);
    box-shadow: inset 0 0 0 3px rgba(34,197,94,0.32);
}

.side h2 {
    margin: 0 0 12px;
}

.info-box {
    background: #0f172a;
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 16px;
    padding: 16px;
    margin-bottom: 14px;
}

.info-box strong {
    display: block;
    margin-bottom: 6px;
}

.info-box span {
    color: #94a3b8;
    font-size: 14px;
    line-height: 1.5;
}

.actions {
    display: grid;
    gap: 10px;
    margin-top: 14px;
}

.btn {
    display: block;
    text-align: center;
    text-decoration: none;
    background: #22c55e;
    color: #fff;
    padding: 14px;
    border-radius: 14px;
    font-weight: bold;
}

.btn-secondary {
    background: #475569;
}

.btn-secondary:hover {
    background: #334155;
}

@media (max-width: 920px) {
    .page {
        grid-template-columns: 1fr;
    }

    .side {
        order: -1;
    }
}

@media (max-width: 560px) {
    body {
        padding: 12px;
    }

    .card {
        padding: 18px;
        border-radius: 18px;
    }

    h1 {
        font-size: 28px;
    }

    .controls {
        grid-template-columns: 1fr;
    }

    .scorebar {
        grid-template-columns: 1fr;
    }

    .memory-board {
        grid-template-columns: repeat(3, 1fr);
        gap: 9px;
    }

    .card-emoji {
        font-size: 28px;
    }

    .card-name {
        font-size: 12px;
    }
}