:root {
    --bg-color: #050505;
    --card-bg: rgba(255, 255, 255, 0.05);
    --border-color: rgba(255, 255, 255, 0.1);
    --cyan-glow: #00f3ff;
    --pink-glow: #ff007f;
    --text-color: #ffffff;
    --font-main: 'Rajdhani', sans-serif;
    --font-heading: 'Orbitron', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 500px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
}

header {
    text-align: center;
    width: 100%;
}

.neon-text {
    font-family: var(--font-heading);
    font-size: 2rem;
    letter-spacing: 4px;
    margin-bottom: 15px;
    text-shadow: 0 0 5px var(--cyan-glow), 0 0 10px var(--cyan-glow);
}

.neon-text .accent {
    color: var(--pink-glow);
    text-shadow: 0 0 5px var(--pink-glow), 0 0 10px var(--pink-glow);
}

.mode-selector {
    background: var(--card-bg);
    padding: 10px 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    gap: 10px;
}

.mode-selector label {
    font-size: 0.8rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.6);
}

.mode-selector select {
    background: transparent;
    color: white;
    border: none;
    font-family: var(--font-main);
    font-weight: 700;
    outline: none;
    cursor: pointer;
}

.mode-selector select option {
    background: #111;
}

.scoreboard {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    width: 100%;
}

.score-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 15px 10px;
    border-radius: 15px;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}

.score-card .label {
    font-size: 0.7rem;
    font-weight: 700;
    margin-bottom: 5px;
    opacity: 0.6;
}

.score-card .score {
    font-size: 1.5rem;
    font-family: var(--font-heading);
}

.score-card.player-x.active {
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.2);
    border-color: var(--cyan-glow);
}

.score-card.player-o.active {
    box-shadow: 0 0 15px rgba(255, 0, 127, 0.2);
    border-color: var(--pink-glow);
}

.game-area {
    position: relative;
    width: 100%;
    aspect-ratio: 1/1;
}

.board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    width: 100%;
    height: 100%;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.tile {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 3rem;
    font-family: var(--font-heading);
    cursor: pointer;
    transition: background 0.2s;
    user-select: none;
    position: relative;
}

.tile:hover {
    background: rgba(255, 255, 255, 0.03);
}

/* Grid lines using pseudo-elements */
.tile:not(:nth-child(3n)) {
    border-right: 1px solid var(--border-color);
}

.tile:not(:nth-last-child(-n+3)) {
    border-bottom: 1px solid var(--border-color);
}

.tile.x {
    color: var(--cyan-glow);
    text-shadow: 0 0 10px var(--cyan-glow), 0 0 20px var(--cyan-glow);
    animation: scaleIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.tile.o {
    color: var(--pink-glow);
    text-shadow: 0 0 10px var(--pink-glow), 0 0 20px var(--pink-glow);
    animation: scaleIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes scaleIn {
    0% {
        transform: scale(0.5);
        opacity: 0;
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.win-line {
    position: absolute;
    background: white;
    z-index: 10;
    border-radius: 5px;
    display: none;
    pointer-events: none;
}

.win-line.active {
    display: block;
    animation: glowLine 1.5s infinite alternate;
}

.win-line.x {
    background: var(--cyan-glow);
    box-shadow: 0 0 10px var(--cyan-glow), 0 0 20px var(--cyan-glow);
}

.win-line.o {
    background: var(--pink-glow);
    box-shadow: 0 0 10px var(--pink-glow), 0 0 20px var(--pink-glow);
}

@keyframes glowLine {
    from {
        opacity: 0.8;
        box-shadow: 0 0 10px currentColor;
    }

    to {
        opacity: 1;
        box-shadow: 0 0 25px currentColor;
    }
}

.controls {
    width: 100%;
}

.neon-button {
    width: 100%;
    padding: 15px;
    background: transparent;
    border: 2px solid var(--cyan-glow);
    color: var(--cyan-glow);
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: 2px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-shadow: 0 0 5px var(--cyan-glow);
    box-shadow: inset 0 0 5px var(--cyan-glow);
}

.neon-button:hover {
    background: var(--cyan-glow);
    color: black;
    box-shadow: 0 0 20px var(--cyan-glow);
}

.status-message {
    font-size: 0.9rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.5);
    margin-top: 10px;
}

@media (max-width: 400px) {
    .tile {
        font-size: 2.5rem;
    }

    .neon-text {
        font-size: 1.5rem;
    }
}