:root {
    /* Use Tailwind colors mainly, but define board specifics */
    --board-color: #27ae60;
    --board-border: #1e8449;
    --cell-border: rgba(0, 0, 0, 0.1);
    --black-piece: #222;
    --white-piece: #eee;
    --accent: #f97316; /* Orange-500 matching Coda */
}

* {
    box-sizing: border-box;
    /* user-select: none;  Removed to allow text selection if needed, specific elements can have it */
}

.reversi-wrapper {
    /* Removed custom layout to use Tailwind flex structure */
    width: 100%;
}

.game-container {
    /* Removed custom background/blur to match Coda's clean style */
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 100%;
}

/* 计分板 - Modified to fit top bar style or sidebar */
.score-board {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 20px;
}

.player-score {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 24px;
    background: white;
    border-radius: 12px;
    border: 2px solid #e2e8f0; /* slate-200 */
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.player-score.active {
    border-color: var(--accent);
    background: #fff7ed; /* orange-50 */
    transform: scale(1.05);
    box-shadow: 0 4px 6px rgba(249, 115, 22, 0.2);
}

.disc-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    border: 1px solid rgba(0,0,0,0.1);
}

.disc-icon.black {
    background: radial-gradient(circle at 30% 30%, #444, #000);
}

.disc-icon.white {
    background: radial-gradient(circle at 30% 30%, #fff, #ddd);
}

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

.name { font-size: 0.85em; color: #64748b; font-weight: bold; }
.score { font-size: 1.5em; font-weight: 800; color: #1e293b; line-height: 1; }

/* 棋盘 */
.board-wrapper {
    background: #1e293b; /* slate-800 */
    padding: 12px;
    border-radius: 8px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    display: flex;
    justify-content: center;
    width: fit-content;
    margin: 0 auto;
}

.board {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    grid-template-rows: repeat(8, 1fr);
    width: 360px; /* Reduced slightly for better fit */
    height: 360px;
    background-color: var(--board-color);
    border: 2px solid #0f172a; /* slate-900 */
    box-shadow: inset 0 0 20px rgba(0,0,0,0.3);
}

@media (min-width: 640px) {
    .board {
        width: 480px;
        height: 480px;
    }
}

.cell {
    position: relative;
    width: 100%;
    height: 100%;
    border: 1px solid rgba(0,0,0,0.2);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
}

/* Wood texture/lines effect */
.cell::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    pointer-events: none;
}

/* 有效移动指示器 */
.cell.valid-move::after {
    content: '';
    width: 12px;
    height: 12px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 50%;
    transition: transform 0.2s;
}

.cell.valid-move:hover::after {
    transform: scale(1.5);
    background: rgba(0, 0, 0, 0.4);
}

/* 最后一步标记 - 红色边框环 */
.cell.last-move .disc::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    transform: translate(-50%, -50%);
    border: 3px solid #e74c3c; /* 红色边框 */
    border-radius: 50%;
    box-sizing: border-box;
    box-shadow: 0 0 8px rgba(231, 76, 60, 0.6);
    z-index: 10;
    animation: pulse-border 2s infinite;
}

@keyframes pulse-border {
    0% { box-shadow: 0 0 0 0 rgba(231, 76, 60, 0.7); }
    70% { box-shadow: 0 0 0 6px rgba(231, 76, 60, 0); }
    100% { box-shadow: 0 0 0 0 rgba(231, 76, 60, 0); }
}

/* 棋子 */
.disc {
    width: 80%;
    height: 80%;
    border-radius: 50%;
    box-shadow: 0 4px 6px rgba(0,0,0,0.4);
    position: absolute;
    transform: scale(0);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.disc.show {
    transform: scale(1);
}

.disc.black {
    background: radial-gradient(circle at 35% 35%, #666, #111);
}

.disc.white {
    background: radial-gradient(circle at 35% 35%, #fff, #ddd);
}

/* 翻转动画 */
.disc.flipping {
    animation: flip-disc 0.4s ease forwards;
}

@keyframes flip-disc {
    0% { transform: scale(1) rotateY(0); }
    50% { transform: scale(0.1) rotateY(90deg); }
    100% { transform: scale(1) rotateY(0); }
}

/* Controls */
.controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    width: 100%;
}

.settings-panel {
    background: #f8fafc; /* slate-50 */
    padding: 16px;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
    width: 100%;
    max-width: 480px;
}

.setting-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.label {
    font-weight: bold;
    color: #475569;
    font-size: 0.9em;
}

.toggle-group {
    display: flex;
    background: #e2e8f0;
    border-radius: 8px;
    padding: 2px;
}

.toggle-btn {
    padding: 6px 16px;
    border: none;
    background: transparent;
    color: #64748b;
    font-weight: 600;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s;
    font-size: 0.9em;
}

.toggle-btn.active {
    background: white;
    color: #0f172a;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.toggle-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Hide color setting in PvP */
#color-setting.hidden {
    display: none;
}

.action-buttons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.btn {
    padding: 10px 24px;
    border-radius: 8px;
    border: none;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s;
    background: #f97316; /* orange-500 */
    color: white;
    box-shadow: 0 2px 4px rgba(249, 115, 22, 0.2);
}

.btn:hover {
    background: #ea580c; /* orange-600 */
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn.secondary {
    background: white;
    color: #64748b;
    border: 1px solid #cbd5e1;
    box-shadow: none;
}

.btn.secondary:hover {
    background: #f1f5f9;
    color: #334155;
    border-color: #94a3b8;
}

.btn:disabled {
    background: #e2e8f0;
    color: #94a3b8;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.status {
    font-weight: bold;
    color: #64748b;
    margin-top: 8px;
    padding: 8px 16px;
    background: #f1f5f9;
    border-radius: 20px;
    font-size: 0.9em;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(15, 23, 42, 0.5); /* slate-900/50 */
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal {
    background: white;
    border-radius: 16px;
    padding: 32px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    text-align: center;
    animation: modal-pop 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes modal-pop {
    0% { transform: scale(0.8); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.modal-header h2 {
    margin-bottom: 24px;
}

.winner-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 24px;
}

.winner-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    margin-bottom: 16px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.winner-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: #1e293b;
}

.result-score-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-bottom: 24px;
}

.result-player {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.result-player .label {
    font-size: 0.9em;
    margin-bottom: 4px;
}

.result-player .score-val {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
}

.result-player.black .score-val { color: #1e293b; }
.result-player.white .score-val { color: #64748b; }

.vs-divider {
    font-weight: bold;
    color: #94a3b8;
    font-size: 0.9em;
}

.score-bar-wrapper {
    height: 8px;
    background: #e2e8f0;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 32px;
}

.score-bar-fill {
    height: 100%;
    background: #1e293b;
    transition: width 0.5s ease;
}

.modal-footer {
    display: flex;
    justify-content: center;
}

.btn.primary {
    width: 100%;
    padding: 12px;
    font-size: 1.1rem;
    background: linear-gradient(to right, var(--accent), #e67e22);
    box-shadow: 0 4px 15px rgba(243, 156, 18, 0.4);
}

.btn.primary:hover {
    background: linear-gradient(to right, #e67e22, #d35400);
    transform: translateY(-1px);
}

/* 响应式 */
@media (max-width: 700px) {
    .board {
        width: 480px;
        height: 480px;
    }
}

@media (max-width: 520px) {
    .board {
        width: 320px;
        height: 320px;
    }
    .score-board { gap: 10px; }
    .player-score { padding: 5px 10px; }
    
    .settings-panel { padding: 10px; }
    .setting-group { flex-direction: column; align-items: flex-start; gap: 5px; }
    .toggle-group { width: 100%; }
}