/* =============================================
   MEMORY.CSS — Memory Match game styles
   Sofia's Game Arcade
   ============================================= */

body {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Back nav handled by base.css */

/* ---- Game container ---- */
.game-container {
    text-align: center;
    padding: var(--space-xl);
    max-width: 620px;
    width: 100%;
}

/* ---- Screen transitions ---- */
.screen {
    display: none;
    opacity: 0;
    transform: translateY(14px);
}

.screen.active {
    display: block;
    animation: screenIn 0.4s ease forwards;
}

@keyframes screenIn {
    from { opacity: 0; transform: translateY(14px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ---- Title screen ---- */
.title {
    font-size: 2.4rem;
    font-weight: 800;
    margin-bottom: var(--space-xs);
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.credit {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: var(--space-xl);
}

.difficulty-label {
    font-size: 1.1rem;
    margin-bottom: var(--space-sm);
}

.difficulty-picker {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
}

.diff-btn {
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-full);
    border: 2px solid var(--border-subtle);
    background: transparent;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 600;
    position: relative;
    transition: border-color var(--transition-fast),
                background var(--transition-fast);
}

.diff-btn:hover {
    border-color: rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.08);
}

.diff-btn.active {
    border-color: var(--accent-purple);
    background: rgba(167, 139, 250, 0.15);
    color: var(--accent-purple);
}

/* "Easiest!" tag on 2x2 button */
.diff-btn.easiest {
    border-color: rgba(74, 222, 128, 0.4);
}

.diff-btn.easiest.active {
    border-color: var(--accent-green);
    background: rgba(74, 222, 128, 0.15);
    color: var(--accent-green);
}

.easiest-tag {
    position: absolute;
    top: -10px;
    right: -8px;
    background: var(--accent-green);
    color: #0b0e1a;
    font-size: 0.55rem;
    font-weight: 800;
    padding: 2px 6px;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* "Hardest!" tag on 8x8 button */
.diff-btn.hardest {
    border-color: rgba(248, 113, 113, 0.4);
}

.diff-btn.hardest.active {
    border-color: var(--accent-red);
    background: rgba(248, 113, 113, 0.15);
    color: var(--accent-red);
}

.hardest-tag {
    position: absolute;
    top: -10px;
    right: -8px;
    background: var(--accent-red);
    color: #0b0e1a;
    font-size: 0.55rem;
    font-weight: 800;
    padding: 2px 6px;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* ---- Buttons ---- */
.btn {
    display: inline-block;
    padding: 0.9rem 2.4rem;
    border-radius: var(--radius-full);
    border: none;
    font-size: 1.15rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform var(--transition-fast),
                box-shadow var(--transition-fast);
    color: #fff;
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(4px);
}

.btn:hover {
    transform: scale(1.06);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.btn:active {
    transform: scale(0.97);
}

.btn-start {
    background: var(--accent-green);
    color: #0b0e1a;
    padding: 1rem 3rem;
    font-size: 1.3rem;
    animation: pulseGlow 2.5s ease-in-out infinite;
}

.btn-start:hover {
    background: #22c55e;
    animation: none;
    box-shadow: 0 0 24px rgba(74, 222, 128, 0.4);
}

@keyframes pulseGlow {
    0%, 100% { box-shadow: 0 0 8px rgba(74, 222, 128, 0.2); }
    50%      { box-shadow: 0 0 24px rgba(74, 222, 128, 0.45); }
}

/* ---- Stats bar ---- */
.stats-bar {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-lg);
    color: var(--text-muted);
    font-size: 1rem;
}

.stats-bar strong {
    color: var(--text-primary);
}

/* ---- Timer ---- */
.timer {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-primary);
    min-width: 50px;
    text-align: center;
}

.timer-warn {
    color: var(--accent-red);
    animation: timerPulse 0.6s ease infinite;
}

@keyframes timerPulse {
    0%, 100% { opacity: 1; }
    50%      { opacity: 0.4; }
}

/* ---- Card grid ---- */
.card-grid {
    display: grid;
    gap: 8px;
    justify-content: center;
    margin: 0 auto;
}

.card-grid.grid-2 {
    grid-template-columns: repeat(2, 100px);
}

.card-grid.grid-3 {
    grid-template-columns: repeat(3, 88px);
}

.card-grid.grid-4 {
    grid-template-columns: repeat(4, 76px);
}

.card-grid.grid-5 {
    grid-template-columns: repeat(5, 64px);
}

.card-grid.grid-6 {
    grid-template-columns: repeat(6, 56px);
    gap: 6px;
}

.card-grid.grid-8 {
    grid-template-columns: repeat(8, 48px);
    gap: 5px;
}

/* ---- Individual card ---- */
.card {
    aspect-ratio: 1;
    perspective: 500px;
    cursor: pointer;
}

.card-inner {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.4s ease;
    border-radius: var(--radius-sm);
}

.card.flipped .card-inner {
    transform: rotateY(180deg);
}

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

.card-front,
.card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Face-down side */
.card-front {
    background: linear-gradient(135deg, rgba(167, 139, 250, 0.25), rgba(96, 165, 250, 0.25));
    border: 2px solid var(--border-subtle);
    font-size: 1.4rem;
    color: var(--text-muted);
}

.card-front::after {
    content: "?";
    font-weight: 800;
}

/* Face-up side */
.card-back {
    background: var(--bg-card);
    border: 2px solid var(--border-subtle);
    transform: rotateY(180deg);
    font-size: 2rem;
}

.card-grid.grid-2 .card-back { font-size: 2.8rem; }
.card-grid.grid-3 .card-back { font-size: 2.2rem; }
.card-grid.grid-4 .card-back { font-size: 1.8rem; }
.card-grid.grid-5 .card-back { font-size: 1.6rem; }
.card-grid.grid-6 .card-back { font-size: 1.4rem; }
.card-grid.grid-6 .card-front { font-size: 1.2rem; }
.card-grid.grid-8 .card-back { font-size: 1.2rem; }
.card-grid.grid-8 .card-front { font-size: 1rem; }

/* Free space (center of odd grids) */
.card.free-space {
    pointer-events: none;
}

.card.free-space .card-back.free-back {
    background: rgba(250, 204, 21, 0.1);
    border-color: rgba(250, 204, 21, 0.3);
}

/* Matched cards glow */
.card.matched:not(.free-space) .card-front,
.card.matched:not(.free-space) .card-back {
    border-color: var(--accent-green);
    box-shadow: 0 0 12px rgba(74, 222, 128, 0.2);
}

/* Disable clicks during checking */
.card.flipped,
.card.matched {
    pointer-events: none;
}

/* ---- Win screen ---- */
.win-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent-green);
    margin-bottom: var(--space-md);
    animation: resultPop 0.5s ease;
}

@keyframes resultPop {
    0%   { opacity: 0; transform: scale(0.7); }
    70%  { transform: scale(1.06); }
    100% { opacity: 1; transform: scale(1); }
}

.win-stats {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: var(--space-xl);
}

.win-stats strong {
    color: var(--text-primary);
}

/* ---- Lose screen ---- */
.lose-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent-red);
    margin-bottom: var(--space-md);
    animation: resultPop 0.5s ease;
}

.lose-stats {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: var(--space-xl);
}

.lose-stats strong {
    color: var(--text-primary);
}

/* ---- Responsive ---- */
@media (max-width: 420px) {
    .game-container {
        padding: 1.2rem;
    }

    .title {
        font-size: 1.8rem;
    }

    .card-grid.grid-2 {
        grid-template-columns: repeat(2, 80px);
    }

    .card-grid.grid-3 {
        grid-template-columns: repeat(3, 72px);
    }

    .card-grid.grid-4 {
        grid-template-columns: repeat(4, 64px);
        gap: 6px;
    }

    .card-grid.grid-5 {
        grid-template-columns: repeat(5, 54px);
        gap: 5px;
    }

    .card-grid.grid-6 {
        grid-template-columns: repeat(6, 46px);
        gap: 4px;
    }

    .card-grid.grid-8 {
        grid-template-columns: repeat(8, 38px);
        gap: 3px;
    }

    .card-grid.grid-8 .card-back {
        font-size: 0.95rem;
    }

    .card-grid.grid-8 .card-front {
        font-size: 0.8rem;
    }
}