@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;700&display=swap');

:root {
    --bg-color: #0f172a; /* Slate 900 */
    --primary-color: #1e293b; /* Slate 800 */
    --hover-color: #334155; /* Slate 700 for hover */
    --glass-bg: rgba(30, 41, 59, 0.7);
    --text-color: #e2e8f0; /* Slate 200 */
    --text-muted: #94a3b8; /* Slate 400 */
    --accent-glow: #2dd4bf; /* Teal 400 */
    --accent-action: #a78bfa; /* Violet 400 */
    --font-main: 'Poppins', sans-serif;
    --grid-size: 3;
    /* --- New Player Colors --- */
    --color-x: #38bdf8; /* Sky Blue */
    --color-o: #facc15; /* Sunny Yellow */
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    text-align: center;
    overflow-x: hidden;
}

.hidden { display: none !important; }

/* --- Popups & Aurora Effect --- */
.popup-content {
    position: relative;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    z-index: 1;
    overflow: hidden;
    max-width: 500px;
    width: 90%;
}

.aurora-background {
    position: absolute; top: 50%; left: 50%;
    width: 200%; height: 200%;
    background: radial-gradient(circle, var(--accent-glow) 0%, var(--accent-action) 50%, transparent 70%);
    transform: translate(-50%, -50%);
    animation: aurora-spin 20s linear infinite;
    z-index: -1;
    opacity: 0.15;
}
@keyframes aurora-spin { from { transform: translate(-50%, -50%) rotate(0deg); } to { transform: translate(-50%, -50%) rotate(360deg); } }

/* --- Game Setup Popup --- */
#setup-popup {
    position: fixed; top: 0; left: 0;
    width: 100%; height: 100%;
    display: flex; justify-content: center; align-items: center;
    z-index: 200; padding: 1rem;
}
#setup-popup h1 {
    margin-bottom: 2rem;
    font-size: 2.2rem;
    text-shadow: 0 0 10px var(--accent-glow);
}
.option-group { margin-bottom: 1.5rem; }
.option-group h2 {
    font-size: 1rem; color: var(--text-muted);
    margin-bottom: 0.75rem; text-transform: uppercase;
    letter-spacing: 1px;
}
.options { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; }
.option-btn {
    padding: 0.75rem 1.5rem; border: 1px solid var(--text-muted); border-radius: 10px;
    background-color: transparent; color: var(--text-muted);
    font-size: 1rem; font-weight: 600; cursor: pointer;
    transition: all 0.3s ease;
}
.option-btn:hover { border-color: var(--accent-glow); color: var(--accent-glow); }
.option-btn.active {
    background-color: var(--accent-glow); color: var(--bg-color);
    border-color: var(--accent-glow); box-shadow: 0 0 15px var(--accent-glow);
}
#start-game-btn {
    width: 100%; padding: 1rem;
    font-size: 1.2rem; font-weight: 700;
    border-radius: 10px; border: none;
    background: var(--accent-action); color: var(--text-color);
    cursor: pointer; transition: all 0.3s ease;
    margin-top: 1rem;
}
#start-game-btn:hover:not(:disabled) { transform: scale(1.05); box-shadow: 0 0 20px var(--accent-action); }
#start-game-btn:disabled { background-color: var(--primary-color); color: var(--text-muted); cursor: not-allowed; }

/* --- Main Game Area --- */
header {
    background-color: var(--primary-color); padding: 1rem 2rem;
    display: flex; justify-content: space-between; align-items: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}
header h1 { font-size: 1.8rem; }
.menu button {
    border: none; border-radius: 8px;
    padding: 0.5rem 1rem; font-size: 1rem; font-weight: 600;
    cursor: pointer; transition: all 0.3s ease;
}
#new-game-btn { background: var(--accent-glow); color: var(--bg-color); }
#music-toggle { margin-right: 1rem; background: var(--primary-color); color: var(--text-color); border: 1px solid var(--text-muted); }

.game-area {
    display: flex; flex-direction: column; align-items: center;
    gap: 1.5rem; padding: 2rem 1rem;
    animation: fadeIn 0.5s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.scoreboard { display: flex; gap: 1rem; width: 100%; max-width: 500px; justify-content: center; }
.score-card {
    background: var(--primary-color); border-radius: 15px; padding: 1rem;
    width: 100%; border: 2px solid transparent; transition: all 0.4s ease;
}
.score-card.active { border-color: var(--accent-glow); box-shadow: 0 0 15px var(--accent-glow); }
.score-card h2 { font-size: 1rem; color: var(--text-muted); margin-bottom: 0.5rem; text-overflow: ellipsis; white-space: nowrap; overflow: hidden;}
.score-card p { font-size: 2.2rem; font-weight: 700; }

.gameContainer { position: relative; width: clamp(280px, 90vmin, 500px); height: clamp(280px, 90vmin, 500px); }
.container {
    display: grid; grid-template-columns: repeat(var(--grid-size), 1fr);
    grid-template-rows: repeat(var(--grid-size), 1fr);
    background-color: var(--primary-color); border-radius: 10px; padding: 1vmin;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
    width: 100%; height: 100%;
}
.box {
    border: 2px solid var(--bg-color); border-radius: 5px;
    font-size: calc(clamp(280px, 90vmin, 500px) / var(--grid-size) * 0.6);
    cursor: pointer; display: flex; justify-content: center; align-items: center;
    transition: background-color 0.3s ease; color: var(--text-color);
}
.box:hover { background-color: var(--hover-color); }
.boxtext { animation: appear 0.3s ease-in-out; }
@keyframes appear { from { transform: scale(0.2); opacity: 0; } to { transform: scale(1); opacity: 1; } }

/* Player-specific colors */
.player-x-color { color: var(--color-x) !important; text-shadow: 0 0 8px var(--color-x); }
.player-o-color { color: var(--color-o) !important; text-shadow: 0 0 8px var(--color-o); }

/* --- Winning Line --- */
#winning-line-svg {
    position: absolute; top: 0; left: 0;
    pointer-events: none; z-index: 10;
}
#winning-line {
    stroke: var(--accent-glow); stroke-width: 10px;
    stroke-linecap: round;
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    animation: draw-line 1s forwards;
}
@keyframes draw-line { to { stroke-dashoffset: 0; } }

.info { font-size: 1.5rem; font-weight: 600; margin-top: 1rem; }

/* --- Result Popup --- */
#result-popup {
    position: fixed; top: 0; left: 0;
    width: 100%; height: 100%;
    display: flex; justify-content: center; align-items: center;
    z-index: 100; padding: 1rem;
}
#result-message { font-size: 2rem; margin-bottom: 1rem; text-shadow: 0 0 10px var(--accent-glow); }
.imgbox { margin: 1rem 0; }
.imgbox img { width: 0; transition: width 0.5s ease-in-out; }
.result-buttons { display: flex; gap: 1rem; margin-top: 1.5rem; }
#play-again-btn, #change-settings-btn {
    padding: 0.75rem 1.5rem; border: none; border-radius: 8px;
    font-size: 1rem; font-weight: 600; cursor: pointer; transition: all 0.3s ease;
}
#play-again-btn { background-color: var(--accent-glow); color: var(--bg-color); }
#change-settings-btn { background-color: transparent; color: var(--text-muted); border: 1px solid var(--text-muted); }