:root {
    color-scheme: dark;
    --bg: #0b1220;
    --panel: #11203a;
    --panel-2: #1a2f54;
    --primary: #38bdf8;
    --primary-2: #7dd3fc;
    --accent: #10b981;
    --text: #e2eaf6;
    --muted: #94a3b8;
    --card-back: linear-gradient(135deg, #1e3a8a 0%, #0c4a6e 100%);
    --card-front: #f1f5f9;
    --card-matched: #064e3b;
    --shadow: 0 14px 30px rgba(0, 0, 0, 0.4);
}

* {
    box-sizing: border-box;
}

html,
body {
    min-height: 100%;
    margin: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    display: grid;
    place-items: center;
    min-height: 100vh;
    background: radial-gradient(ellipse at top, #1e3a5f 0, var(--bg) 50%);
    color: var(--text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button {
    border: 0;
    border-radius: 8px;
    background: var(--primary);
    color: #06121f;
    cursor: pointer;
    font: inherit;
    font-weight: 800;
    transition: filter 0.15s ease;
}

button:hover:not(:disabled) {
    filter: brightness(1.08);
}

button:focus-visible {
    outline: 3px solid #ffffff;
    outline-offset: 2px;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.game-shell {
    width: min(100%, 760px);
    min-height: 100vh;
    padding: 16px;
    display: grid;
    align-content: center;
    gap: 14px;
}

/* ─── Scorebar ─── */
.scorebar {
    display: grid;
    grid-template-columns: repeat(3, 1fr) auto;
    gap: 10px;
    align-items: center;
    border: 1px solid rgba(255, 255, 255, 0.10);
    border-radius: 10px;
    background: rgba(17, 32, 58, 0.85);
    padding: 12px;
    backdrop-filter: blur(6px);
}

.scorebar div {
    display: grid;
    gap: 3px;
}

.label {
    color: var(--muted);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.scorebar strong {
    font-size: clamp(20px, 5vw, 30px);
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.muted-suffix {
    color: var(--muted);
    font-size: 0.6em;
    font-weight: 600;
}

#restartButton {
    min-width: 100px;
    height: 40px;
    background: rgba(255, 255, 255, 0.08);
    color: var(--text);
}

/* ─── Tabuleiro ─── */
.board-wrap {
    position: relative;
    width: min(100%, 560px);
    margin: 0 auto;
    aspect-ratio: 1;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    background: var(--panel);
    box-shadow: var(--shadow);
    padding: 10px;
}

.board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(4, 1fr);
    gap: 8px;
    width: 100%;
    height: 100%;
}

/* ─── Cartas ─── */
.card {
    position: relative;
    perspective: 600px;
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
    /* Reset estilos globais de button que quebram o flip 3D */
    background: transparent;
    border-radius: 0;
    transition: none;
    filter: none !important;
}

.card-inner {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transition: transform 0.45s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 8px;
}

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

.card-face {
    position: absolute;
    inset: 0;
    border-radius: 8px;
    display: grid;
    place-items: center;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    font-size: clamp(28px, 7vw, 48px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.25);
}

.card-back {
    background: var(--card-back);
    color: rgba(255, 255, 255, 0.4);
    border: 2px solid rgba(255, 255, 255, 0.12);
    font-size: clamp(16px, 4vw, 22px);
    font-weight: 900;
    letter-spacing: 1px;
}

.card-front {
    background: var(--card-front);
    color: #0f172a;
    transform: rotateY(180deg);
    border: 2px solid #cbd5e1;
}

.card.matched .card-front {
    background: linear-gradient(135deg, #34d399 0%, #10b981 100%);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.35);
    animation: match-pulse 0.5s ease;
}

@keyframes match-pulse {
    0%, 100% { transform: rotateY(180deg) scale(1); }
    50%      { transform: rotateY(180deg) scale(1.08); }
}

.card.shake .card-inner {
    animation: shake 0.4s ease;
}

@keyframes shake {
    0%, 100% { transform: rotateY(180deg) translateX(0); }
    25%      { transform: rotateY(180deg) translateX(-4px); }
    75%      { transform: rotateY(180deg) translateX(4px); }
}

/* ─── Overlay ─── */
.overlay {
    position: absolute;
    inset: 0;
    display: grid;
    place-content: center;
    gap: 14px;
    padding: 28px;
    text-align: center;
    background: rgba(11, 18, 32, 0.92);
    border-radius: 12px;
    backdrop-filter: blur(8px);
    z-index: 10;
}

.overlay[hidden] {
    display: none;
}

.overlay h1 {
    margin: 0;
    font-size: clamp(28px, 7vw, 48px);
    line-height: 1.1;
}

.overlay p {
    max-width: 380px;
    margin: 0 auto;
    color: var(--muted);
    line-height: 1.5;
    font-size: 14px;
}

.overlay .stats-final {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    max-width: 380px;
    margin: 8px auto 0;
}

.overlay .stat-card {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.10);
    border-radius: 8px;
    padding: 10px 6px;
}

.overlay .stat-card .label {
    margin-bottom: 4px;
}

.overlay .stat-card strong {
    font-size: 20px;
    color: var(--primary-2);
    line-height: 1;
}

.overlay button {
    justify-self: center;
    min-width: 160px;
    height: 48px;
    margin-top: 6px;
}

/* ─── Hint ─── */
.hint {
    text-align: center;
    color: var(--muted);
    font-size: 12px;
    margin: 0;
}

/* ─── Mobile ─── */
@media (max-width: 720px) {
    .game-shell {
        align-content: start;
    }

    .scorebar {
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
        padding: 10px;
    }

    #restartButton {
        grid-column: 1 / -1;
        width: 100%;
    }
}