:root {
    --bg-color: #0f172a;
    --board-bg: rgba(30, 41, 59, 0.7);
    --cell-bg: rgba(255, 255, 255, 0.03);
    --cell-hover: rgba(255, 255, 255, 0.08);
    --border-color: rgba(255, 255, 255, 0.1);

    --p1-color: #1a1a1a;
    /* Black stone */
    --p1-rim: #444;
    --p2-color: #f1f5f9;
    /* White stone */
    --p2-rim: #cbd5e1;

    --axis-color: #f59e0b;
    /* Amber/Orange */
    --axis-glow: rgba(245, 158, 11, 0.6);

    --accent-color: #3b82f6;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;

    --font-main: 'Outfit', sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
    /* Prevent selection during play */
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    background-image:
        radial-gradient(circle at 10% 20%, rgba(59, 130, 246, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(245, 158, 11, 0.05) 0%, transparent 40%);
}

.app-container {
    width: 100%;
    max-width: 600px;
    height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 20px;
}

/* Header */
.game-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 20px;
}

.logo-container h1 {
    font-weight: 800;
    font-size: 2.5rem;
    letter-spacing: 4px;
    background: linear-gradient(to right, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-align: center;
}

.subtitle {
    font-size: 0.8rem;
    color: var(--text-secondary);
    letter-spacing: 1px;
    text-transform: uppercase;
}

/* Scoreboard */
.score-board {
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    padding: 10px 20px;
    border-radius: 20px;
    margin-top: 15px;
    border: 1px solid var(--border-color);
    width: 100%;
}

.player-card {
    display: flex;
    align-items: center;
    gap: 10px;
    opacity: 0.5;
    transition: opacity 0.3s, transform 0.3s;
}

.player-card.active {
    opacity: 1;
    transform: scale(1.05);
}

.player-card.active .player-name {
    color: var(--axis-color);
    text-shadow: 0 0 10px var(--axis-glow);
}

.player-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.p1-avatar {
    background: radial-gradient(circle at 30% 30%, #444, #000);
    border: 2px solid #555;
}

.p2-avatar {
    background: radial-gradient(circle at 30% 30%, #fff, #ccc);
    border: 2px solid #fff;
}

.player-info {
    display: flex;
    flex-direction: column;
}

.player-name {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 1px;
}

.player-score {
    font-size: 1.2rem;
    font-weight: 800;
}

.vs-divider {
    margin: 0 20px;
    font-weight: 800;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* Game Area */
.game-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
}

.status-bar {
    text-align: center;
}

.turn-indicator {
    background: rgba(0, 0, 0, 0.3);
    padding: 8px 16px;
    border-radius: 50px;
    border: 1px solid var(--border-color);
    font-size: 0.9rem;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.phase-text {
    color: var(--axis-color);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Board */
.board-container {
    position: relative;
    padding: 10px;
}

.game-board {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    grid-template-rows: repeat(6, 1fr);
    gap: 8px;
    background: var(--board-bg);
    padding: 15px;
    border-radius: 12px;
    box-shadow:
        0 20px 50px rgba(0, 0, 0, 0.5),
        inset 0 0 0 1px rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    width: 90vw;
    max-width: 400px;
    aspect-ratio: 1;
}

.cell {
    background: var(--cell-bg);
    border-radius: 8px;
    position: relative;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    justify-content: center;
    align-items: center;
}

.cell:hover {
    background: var(--cell-hover);
}

/* Valid Move Indicators */
.cell.valid-move-axis::after {
    content: '';
    width: 12px;
    height: 12px;
    background-color: rgba(245, 158, 11, 0.3);
    border-radius: 50%;
    animation: pulse 1.5s infinite;
}

.cell.valid-move-stone::after {
    content: '';
    width: 12px;
    height: 12px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
}

@keyframes pulse {
    0% {
        transform: scale(0.8);
        opacity: 0.5;
    }

    50% {
        transform: scale(1.2);
        opacity: 0.8;
    }

    100% {
        transform: scale(0.8);
        opacity: 0.5;
    }
}

/* Pieces */
.piece {
    width: 80%;
    height: 80%;
    border-radius: 50%;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
}

.piece.appear {
    animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes popIn {
    from {
        transform: scale(0);
    }

    to {
        transform: scale(1);
    }
}

.piece-black {
    background: radial-gradient(circle at 30% 30%, #444, #000);
    border: 2px solid #333;
}

.piece-white {
    background: radial-gradient(circle at 30% 30%, #fff, #e2e8f0);
    border: 2px solid #fff;
}

.piece-axis {
    background: radial-gradient(circle at 30% 30%, #fbbf24, #d97706);
    border: 2px solid #fcd34d;
    box-shadow: 0 0 15px var(--axis-glow);
    border-radius: 30%;
    /* Slightly squared to differentiate shape */
    transform: rotate(45deg);
}

.piece-axis::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40%;
    height: 40%;
    background: rgba(255, 255, 255, 0.4);
    border-radius: 50%;
}

/* Controls */
.controls {
    display: flex;
    gap: 15px;
}

.btn {
    padding: 10px 24px;
    border-radius: 8px;
    border: none;
    font-family: var(--font-main);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.8rem;
}

.btn.primary {
    background: var(--text-primary);
    color: var(--bg-color);
}

.btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 255, 255, 0.2);
}

.btn.secondary {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.btn.secondary:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    opacity: 1;
    transition: opacity 0.3s;
}

.modal.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background: #1e293b;
    padding: 30px;
    border-radius: 16px;
    max-width: 500px;
    width: 90%;
    border: 1px solid var(--border-color);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.close-modal {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
}

.modal-body h3 {
    color: var(--axis-color);
    margin: 15px 0 5px 0;
}

.modal-body p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 10px;
}

.center-text {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

#winner-title {
    font-size: 2rem;
    color: var(--text-primary);
}

#winner-message {
    font-size: 1.2rem;
    color: var(--axis-color);
}

/* Responsive */
@media (max-height: 700px) {
    .game-board {
        max-width: 300px;
    }

    .logo-container h1 {
        font-size: 1.8rem;
    }
}

/* Rotation Indicator */
.cell.valid-rotate-axis::after {
    content: '↻';
    color: rgba(255, 255, 255, 0.8);
    font-size: 24px;
    position: absolute;
    z-index: 10;
    animation: spin 2s infinite linear;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}