:root {
    --card-size: 80px;
    --gap: 12px;
    --card-back: rgba(113, 54, 211, 0.4);
    --card-front: rgba(255, 255, 255, 0.08);
    --success-green: #2ecc71;
    --card-bg: rgba(35, 36, 52, 0.6);
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.game-wrapper {
    padding-top: 100px;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding-bottom: 40px;
}

.main-wrapper {
    display: flex;
    gap: 40px;
    align-items: flex-start;
    max-width: 1200px;
    width: min(95%, 1100px);
    justify-content: center;
}

.container {
    text-align: center;
    background: var(--card-bg);
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    flex-shrink: 0;
}

h1 {
    color: #fff;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.memory-mode-selector {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    margin: 0 auto 14px;
}

.memory-mode-btn {
    min-height: 40px;
    padding: 8px 12px;
    border: 1px solid rgba(219, 197, 255, 0.3);
    border-radius: 9px;
    background: rgba(255, 255, 255, 0.05);
    color: rgba(255, 255, 255, 0.72);
    font-weight: 800;
    cursor: pointer;
}

.memory-mode-btn:hover {
    background: rgba(113, 54, 211, 0.2);
    color: #fff;
}

.memory-mode-btn.active {
    border-color: rgba(219, 197, 255, 0.7);
    background: rgba(113, 54, 211, 0.62);
    color: #fff;
}

.game-stats {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    gap: 20px;
    font-weight: bold;
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.9rem;
}

.save-status {
    min-height: 2.4em;
    max-width: 360px;
    margin: 0 auto 14px;
    color: rgba(255, 255, 255, 0.62);
    font-size: 0.82rem;
    line-height: 1.4;
}

.grid {
    display: grid;
    grid-template-columns: repeat(var(--memory-columns, 4), var(--card-size));
    grid-template-rows: repeat(var(--memory-rows, 4), var(--card-size));
    gap: var(--gap);
    margin-bottom: 20px;
    perspective: 1000px;
    transition: opacity 0.2s ease;
}

.grid.mode-hard {
    --card-size: 72px;
    --gap: 10px;
}

.grid.board-waiting {
    opacity: 0.55;
    pointer-events: none;
}

.card {
    width: var(--card-size);
    height: var(--card-size);
    padding: 0;
    position: relative;
    cursor: pointer;
    transform-style: preserve-3d;
    transition: transform 0.5s ease;
    background: transparent;
    border: 0;
    border-radius: 12px;
}

.card:hover:not(:disabled) {
    transform: translateY(-2px);
}

.card.flipped,
.card.flipped:hover {
    transform: rotateY(180deg);
}

.card:disabled {
    cursor: default;
}

.card.matched .card-front {
    background-color: var(--success-green);
    color: white;
    box-shadow: 0 0 15px rgba(46, 204, 113, 0.4);
}

.card-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.card-front {
    background-color: var(--card-front);
    color: #fff;
    transform: rotateY(180deg);
}

.card-back {
    background-color: var(--card-back);
    border: 1px solid rgba(113, 54, 211, 0.4);
}

.message {
    font-size: 1rem;
    font-weight: bold;
    color: var(--success-green);
    margin: 0 0 14px;
    min-height: 1.5rem;
}

.message.message-error {
    color: #ff8d8d;
}

.message.message-info {
    color: #dbc5ff;
}

.hidden {
    display: none !important;
}

.memory-game-actions {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
}

#reset-btn,
#publish-btn {
    padding: 10px 20px;
    font-size: 1rem;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

#reset-btn {
    background-color: rgba(113, 54, 211, 1);
}

#publish-btn {
    background-color: rgba(46, 204, 113, 0.92);
    font-weight: 800;
}

#reset-btn:hover,
#publish-btn:hover:not(:disabled) {
    transform: translateY(-2px);
}

#reset-btn:hover {
    background-color: rgba(113, 54, 211, 0.8);
}

#publish-btn:hover:not(:disabled) {
    background-color: rgba(46, 204, 113, 1);
}

#publish-btn:disabled {
    opacity: 0.58;
    cursor: wait;
}

.leaderboard {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    min-width: 270px;
    color: #fff;
}

.leaderboard h3 {
    text-align: center;
    color: #fff;
    margin: 0 0 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.leaderboard ol {
    list-style: none;
    padding: 0;
    margin: 0;
}

.leaderboard li {
    padding: 11px 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    justify-content: space-between;
    gap: 14px;
    font-size: 0.92rem;
    color: rgba(255, 255, 255, 0.82);
    border-radius: 7px;
}

.leaderboard li:last-child {
    border-bottom: none;
}

.leaderboard li.current-player-score {
    background: rgba(113, 54, 211, 0.22);
    color: #fff;
}

.leaderboard-empty {
    justify-content: center !important;
    color: rgba(255, 255, 255, 0.55) !important;
}

.leaderboard-name {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.leaderboard-time {
    color: #dbc5ff;
    font-variant-numeric: tabular-nums;
    font-weight: 700;
}

.my-best {
    margin: 14px 0 0;
    padding-top: 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #dbc5ff;
    text-align: center;
    font-size: 0.86rem;
}

@media (max-width: 768px) {
    :root {
        --card-size: min(19vw, 76px);
        --gap: min(2.5vw, 10px);
    }

    .game-wrapper {
        padding-top: 90px;
    }

    .main-wrapper {
        flex-direction: column;
        align-items: center;
        gap: 20px;
    }

    .container {
        width: min(94vw, 430px);
        box-sizing: border-box;
        padding: 22px 14px;
    }

    .grid {
        justify-content: center;
    }

    .grid.mode-hard {
        --card-size: min(15.5vw, 68px);
        --gap: min(2vw, 9px);
    }

    .leaderboard {
        width: min(94vw, 430px);
        box-sizing: border-box;
        order: 2;
    }
}

/* v109: public proof replays for leaderboard best times. */
.leaderboard li.has-proof {
    align-items: center;
}

.leaderboard-proof {
    flex: 0 0 auto;
    min-height: 34px;
    padding: 0 10px;
    border: 1px solid rgba(219, 197, 255, 0.42);
    border-radius: 8px;
    background: rgba(113, 54, 211, 0.28);
    color: #f4ebff;
    font-weight: 800;
    cursor: pointer;
}

.leaderboard-proof:hover {
    background: rgba(113, 54, 211, 0.48);
}

.leaderboard-proof:disabled {
    opacity: 0.55;
    cursor: wait;
}

.leaderboard-time-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 0 0 auto;
}

.leaderboard-legacy {
    color: rgba(255,255,255,.42);
    font-size: .72rem;
    white-space: nowrap;
}

.memory-replay-overlay {
    position: fixed;
    inset: 0;
    z-index: 5000;
    display: grid;
    place-items: center;
    padding: 20px;
    background: rgba(0, 0, 0, 0.82);
    backdrop-filter: blur(8px);
}

.memory-replay-card {
    width: min(94vw, 560px);
    max-height: 92vh;
    overflow: auto;
    box-sizing: border-box;
    padding: 22px;
    border: 1px solid rgba(255,255,255,.14);
    border-radius: 20px;
    background: rgba(22, 22, 32, .97);
    color: #fff;
    box-shadow: 0 20px 70px rgba(0,0,0,.6);
}

.memory-replay-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
}

.memory-replay-head span {
    display: block;
    color: #cdb5ff;
    font-size: .75rem;
    font-weight: 800;
    letter-spacing: .12em;
    text-transform: uppercase;
}

.memory-replay-head h2 {
    margin: 3px 0 0;
    font-size: 1.4rem;
}

#memory-replay-close {
    width: 44px;
    height: 44px;
    border: 1px solid rgba(255,255,255,.18);
    border-radius: 12px;
    background: rgba(255,255,255,.06);
    color: #fff;
    font-size: 1.6rem;
    cursor: pointer;
}

.memory-replay-meta,
.memory-replay-status {
    color: rgba(255,255,255,.7);
    line-height: 1.45;
}

.memory-replay-timer {
    margin: 10px 0 14px;
    color: #dbc5ff;
    font-variant-numeric: tabular-nums;
}

.memory-replay-board {
    margin: 0 auto 16px;
    justify-content: center;
    pointer-events: none;
}

.memory-replay-board .card {
    cursor: default;
}

.memory-replay-play {
    width: 100%;
    min-height: 46px;
    border: 0;
    border-radius: 10px;
    background: rgba(113, 54, 211, 1);
    color: #fff;
    font-weight: 900;
    cursor: pointer;
}

@media (max-width: 520px) {
    .leaderboard li {
        align-items: center;
    }
    .leaderboard-time-wrap {
        gap: 6px;
    }
    .leaderboard-proof {
        padding: 0 8px;
        min-height: 32px;
    }
    .memory-replay-card {
        padding: 16px 12px;
    }
}