@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600&family=Share+Tech+Mono&display=swap');

:root {
    --neon-cyan: #0ef1ff;
    --neon-magenta: #ff1fb5;
    --neon-purple: #9d44ff;
    --card-bg: rgba(3, 6, 18, 0.75);
    --card-border: rgba(255, 255, 255, 0.18);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    width: 100%;
    font-family: 'Space Grotesk', 'Share Tech Mono', sans-serif;
    color: #f5f5f5;
    background: radial-gradient(circle at top, rgba(255, 255, 255, 0.04), transparent 45%),
        linear-gradient(135deg, #04090f 0%, #03040c 80%);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1.5rem;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 80px 80px, 80px 80px;
    pointer-events: none;
    z-index: 0;
}

.app-shell {
    position: relative;
    width: min(960px, 100%);
    padding: clamp(1.5rem, 3vw, 2.25rem);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(0, 0, 0, 0.65));
    border: 1px solid var(--card-border);
    border-radius: 2rem;
    box-shadow: 0 0 40px rgba(14, 241, 255, 0.25);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 960px;
    overflow: hidden;
}

.app-shell::after {
    content: '';
    position: absolute;
    inset: 1px;
    border-radius: 1.8rem;
    border: 1px solid rgba(255, 255, 255, 0.08);
    pointer-events: none;
}

.app-header {
    text-align: center;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
}

.tagline {
    letter-spacing: 0.8rem;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.6);
    margin: 0;
}

.app-header h1 {
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    margin: 0.35rem 0 0;
    color: #fff;
    text-transform: uppercase;
    text-shadow: 0 0 10px var(--neon-cyan), 0 0 20px var(--neon-cyan), 0 0 40px rgba(0, 0, 0, 0.4);
}

.scoreboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.2rem;
    width: 100%;
    position: relative;
    z-index: 1;
}

.score {
    padding: 1.5rem;
    border-radius: 1.2rem;
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.15);
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    align-items: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.score::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(14, 241, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.score:hover::before {
    left: 100%;
}

.neon-box {
    box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.35), 0 0 20px rgba(14, 241, 255, 0.6);
}

.score .label {
    font-size: 0.9rem;
    letter-spacing: 0.4rem;
    margin: 0;
    color: rgba(255, 255, 255, 0.75);
}

.score .value {
    margin: 0;
    font-size: 2.5rem;
    font-family: 'Share Tech Mono', monospace;
    transition: all 0.3s ease;
}

.score .value.updated {
    color: var(--neon-cyan);
    text-shadow: 0 0 20px var(--neon-cyan), 0 0 40px var(--neon-cyan);
    transform: scale(1.2);
    animation: pulse 1s ease-in-out;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.3); }
    100% { transform: scale(1.2); }
}

.controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.controls button,
.controls select {
    border: 1px solid rgba(255, 255, 255, 0.5);
    background: rgba(0, 0, 0, 0.5);
    color: #fff;
    padding: 0.85rem 1.4rem;
    border-radius: 999px;
    font-size: 0.95rem;
    font-family: 'Share Tech Mono', monospace;
    letter-spacing: 0.1rem;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.controls button::before,
.controls select::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(14, 241, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.controls button:hover::before,
.controls select:hover::before {
    left: 100%;
}

.controls button:hover,
.controls select:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 25px rgba(14, 241, 255, 0.5);
    border-color: var(--neon-cyan);
    color: var(--neon-cyan);
}

.controls button:active,
.controls select:active {
    transform: translateY(-1px) scale(1.02);
    box-shadow: 0 4px 15px rgba(14, 241, 255, 0.3);
}

.controls button.active {
    border-color: var(--neon-magenta);
    color: var(--neon-magenta);
    box-shadow: 0 0 20px rgba(255, 31, 181, 0.5);
}

.controls button.active:hover {
    box-shadow: 0 8px 25px rgba(255, 31, 181, 0.7);
}

.controls button:focus,
.controls select:focus {
    outline: none;
    border-color: var(--neon-cyan);
    box-shadow: 0 0 10px rgba(14, 241, 255, 0.5);
    color: var(--neon-cyan);
}

.board-panel {
    background: rgba(2, 6, 17, 0.85);
    border-radius: 2rem;
    padding: clamp(1.5rem, 3vw, 2rem);
    box-shadow: inset 0 0 30px rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 520px;
    margin: 0 auto;
}

.board {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(0.65rem, 1vw, 1rem);
    width: 100%;
    max-width: 520px;
    margin: 0 auto;
}

.cell {
    aspect-ratio: 1;
    border-radius: 1.3rem;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0));
    border: 1px solid rgba(255, 255, 255, 0.12);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: clamp(2rem, 4vw, 3rem);
    cursor: pointer;
    color: #fff;
    box-shadow: inset 0 0 15px rgba(255, 255, 255, 0.04), 0 0 30px rgba(0, 0, 0, 0.6);
    transition: border 0.2s ease, box-shadow 0.2s ease;
}

.cell.x {
    color: var(--neon-cyan);
    text-shadow: 0 0 15px var(--neon-cyan), 0 0 30px rgba(14, 241, 255, 0.6);
    border-color: rgba(14, 241, 255, 0.5);
    box-shadow: 0 0 20px rgba(14, 241, 255, 0.7);
}

.cell.o {
    color: var(--neon-magenta);
    text-shadow: 0 0 15px var(--neon-magenta), 0 0 30px rgba(255, 31, 181, 0.6);
    border-color: rgba(255, 31, 181, 0.5);
    box-shadow: 0 0 20px rgba(255, 31, 181, 0.7);
}

audio {
    display: none;
}

@media (max-width: 768px) {
    .app-shell {
        width: min(500px, 95vw);
        padding: 1rem;
    }

    .controls {
        flex-direction: column;
    }

    .controls button,
    .controls select {
        width: 100%;
        text-align: center;
    }

    .scoreboard {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }

    .board-panel {
        padding: 1rem;
    }

    .board {
        width: 100%;
        max-width: 90vw;
        gap: 0.5rem;
    }

    .cell {
        font-size: clamp(1.5rem, 8vw, 2.5rem);
    }
}

@media (min-width: 769px) {
    .app-shell {
        display: grid;
        grid-template-columns: 1fr 2fr 1fr;
        grid-template-rows: auto 1fr;
        grid-template-areas:
            "header header header"
            "controls board scoreboard";
        gap: 1.5rem;
        width: min(1200px, 95vw);
        padding: clamp(1.5rem, 3vw, 2.25rem);
    }

    .app-header {
        grid-area: header;
        text-align: center;
        margin-bottom: 0;
    }

    .controls {
        grid-area: controls;
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        gap: 1.5rem;
        padding: 1rem;
        background: rgba(3, 6, 18, 0.5);
        border-radius: 1rem;
        border: 1px solid rgba(255, 255, 255, 0.1);
    }

    .controls button,
    .controls select {
        width: 100%;
        max-width: 200px;
        font-size: 1rem;
        padding: 1rem 1.5rem;
    }

    .board-panel {
        grid-area: board;
        max-width: none;
        margin: 0;
        width: 100%;
    }

    .scoreboard {
        grid-area: scoreboard;
        grid-template-columns: 1fr;
        gap: 1.2rem;
        justify-items: center;
        padding: 1rem;
        background: rgba(3, 6, 18, 0.5);
        border-radius: 1rem;
        border: 1px solid rgba(255, 255, 255, 0.1);
    }

    .score {
        width: 100%;
        max-width: 200px;
        padding: 2rem 1.5rem;
    }

    .score .value {
        font-size: 3rem;
    }

    .board {
        max-width: 520px;
        margin: 0 auto;
    }
}