:root {
	--bg: #0f1115;
	--panel: #171a21;
	--muted: #8b93a7;
	--text: #e6e9ef;
	--accent: #4f9ef8;
	--accent-2: #57d19c;
	--border: #222633;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
	margin: 0;
	background: var(--bg);
	color: var(--text);
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

.app {
	max-width: 1000px;
	margin: 0 auto;
	padding: 16px;
}

.topbar {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 12px 0;
}
.brand { font-size: 20px; font-weight: 700; }
.actions { display: flex; gap: 8px; align-items: center; }
.ai-group {
	display: flex;
	gap: 4px;
	align-items: center;
}

.join-group {
	display: flex;
	gap: 4px;
	align-items: center;
}

#roomIdInput {
	background: var(--panel);
	color: var(--text);
	border: 1px solid var(--border);
	border-radius: 8px;
	padding: 10px 8px;
	width: 120px;
	font-size: 13px;
}

#roomIdInput:focus {
	outline: none;
	border-color: var(--accent);
}

#roomIdInput::placeholder {
	color: var(--muted);
}

/* 模态框样式 */
.modal {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	z-index: 1000;
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 20px;
}

.modal.hidden {
	display: none;
}

.modal-backdrop {
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	background: rgba(0, 0, 0, 0.6);
	backdrop-filter: blur(2px);
}

.modal-content {
	position: relative;
	background: var(--panel);
	border: 1px solid var(--border);
	border-radius: 12px;
	padding: 0;
	width: 100%;
	max-width: 400px;
	box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
	animation: modal-in 200ms ease-out;
}

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

.modal-header h3 {
	margin: 0;
	font-size: 18px;
	font-weight: 600;
	color: var(--text);
}

.modal-close {
	background: none;
	border: none;
	color: var(--muted);
	font-size: 24px;
	font-weight: 300;
	cursor: pointer;
	padding: 0;
	width: 28px;
	height: 28px;
	display: flex;
	align-items: center;
	justify-content: center;
	border-radius: 6px;
	transition: all 0.15s;
}

.modal-close:hover {
	background: rgba(255, 255, 255, 0.1);
	color: var(--text);
}

.modal-body {
	padding: 20px;
}

.modal-hint {
	margin: 15px 0 0 0;
	color: var(--muted);
	font-size: 13px;
	line-height: 1.5;
}

@keyframes modal-in {
	from {
		opacity: 0;
		transform: translateY(20px) scale(0.95);
	}
	to {
		opacity: 1;
		transform: translateY(0) scale(1);
	}
}

.modal-actions {
	display: flex;
	gap: 10px;
	justify-content: flex-end;
	margin-top: 20px;
}

.modal-actions .btn {
	min-width: 80px;
}

.btn-primary {
	background: var(--accent);
	color: white;
	border-color: var(--accent);
}

.btn-primary:hover {
	background: #4a8ce7;
	border-color: #4a8ce7;
}

/* 游戏操作按钮组 */
.game-actions {
	display: flex;
	gap: 8px;
	align-items: center;
}

.btn.danger {
	border-color: #e74c3c;
	color: #e74c3c;
}

.btn.danger:hover {
	background: #e74c3c;
	color: white;
}

.btn.warning {
	border-color: #f39c12;
	color: #f39c12;
}

.btn.warning:hover {
	background: #f39c12;
	color: white;
}
.difficulty-select {
	background: var(--panel);
	color: var(--text);
	border: 1px solid var(--border);
	border-radius: 8px;
	padding: 10px 8px;
	cursor: pointer;
	font-size: 13px;
}
.difficulty-select:hover {
	border-color: var(--accent);
}
.difficulty-select:focus {
	outline: none;
	border-color: var(--accent);
}
.btn {
	background: var(--accent);
	color: white;
	border: none;
	padding: 10px 14px;
	border-radius: 8px;
	cursor: pointer;
}
.btn:hover { filter: brightness(1.06); }
.btn:active { transform: translateY(1px); }
.btn-outline {
	background: transparent;
	border: 1px solid var(--border);
	color: var(--text);
}
.btn.sm { padding: 8px 10px; }

.main {
	display: grid;
	grid-template-columns: 1fr 320px;
	gap: 16px;
}
@media (max-width: 900px) {
	.main { grid-template-columns: 1fr; }
}

.board-section {
	background: var(--panel);
	border: 1px solid var(--border);
	border-radius: 12px;
	padding: 12px;
	display: flex;
	flex-direction: column;
	align-items: center;
}
.players {
	width: 100%;
	display: grid;
	grid-template-columns: 1fr auto 1fr;
	gap: 8px;
	margin-bottom: 8px;
}
.player-side {
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	color: var(--muted);
}
.turn-indicator {
	display: flex;
	align-items: center;
	justify-content: center;
	min-width: 160px;
}
.turn-badge {
	display: inline-block;
	padding: 6px 10px;
	border-radius: 999px;
	border: 1px solid var(--border);
	background: #10131a;
	color: var(--text);
	font-weight: 600;
}
.turn-badge.black {
	border-color: #6b6b6b;
	background: #0f0f10;
	color: #f2f2f2;
}
.turn-badge.white {
	border-color: #dddddd;
	background: #f5f5f5;
	color: #111111;
}
.turn-badge.active {
	animation: pulse-breath 1200ms ease-in-out infinite;
}
@keyframes pulse-breath {
	0%   { transform: translateZ(0) scale(1); box-shadow: 0 0 0 0 rgba(79, 158, 248, 0.0); }
	50%  { transform: translateZ(0) scale(1.04); box-shadow: 0 0 18px 2px rgba(79, 158, 248, 0.25); }
	100% { transform: translateZ(0) scale(1); box-shadow: 0 0 0 0 rgba(79, 158, 248, 0.0); }
}
.player-side .role {
	font-weight: 700;
}
.player-side .role.white { color: #f2f2f2; }
.player-side .role.black { color: #000; background: #f2f2f2; padding: 0 6px; border-radius: 6px; }
.player-side .name {
	color: var(--text);
}
canvas#board {
	background: #e9c089; /* wood-like */
	border-radius: 8px;
	box-shadow: inset 0 0 0 1px rgba(0,0,0,0.1);
	max-width: 100%;
	height: auto;
}
.status {
	margin-top: 12px;
	color: var(--muted);
	display: grid;
	gap: 4px;
	text-align: center;
}

.side { display: grid; gap: 12px; }
.panel {
	background: var(--panel);
	border: 1px solid var(--border);
	border-radius: 12px;
	padding: 12px;
}
.panel-title { font-weight: 600; margin-bottom: 8px; }
.row { display: flex; gap: 8px; }
input[type="text"] {
	flex: 1;
	background: #11131a;
	color: var(--text);
	border: 1px solid var(--border);
	border-radius: 8px;
	padding: 10px 12px;
}
.chat-box {
	height: 260px;
	overflow: auto;
	background: #11131a;
	border: 1px solid var(--border);
	border-radius: 8px;
	padding: 8px;
	margin-bottom: 8px;
}
.chat-msg { margin: 4px 0; }
.chat-name { color: var(--accent-2); font-weight: 600; margin-right: 6px; }
.pill {
	display: inline-block;
	padding: 0 8px;
	border-radius: 999px;
	border: 1px solid var(--border);
	background: #10131a;
	color: var(--muted);
	font-size: 12px;
}

.toast-container {
	position: fixed;
	top: 20px;
	left: 50%;
	transform: translateX(-50%);
	display: flex;
	flex-direction: column;
	gap: 10px;
	z-index: 9999;
	pointer-events: none;
}
.toast {
	background: rgba(23, 26, 33, 0.95);
	color: var(--text);
	border: 1px solid var(--border);
	border-radius: 10px;
	padding: 10px 14px;
	box-shadow: 0 10px 30px rgba(0,0,0,0.35);
	min-width: 220px;
	text-align: center;
	pointer-events: auto;
	opacity: 0;
	transform: translateY(-6px);
	animation: toast-in 180ms ease-out forwards;
}
.toast.success { border-color: #2e7d32; }
.toast.info { border-color: #4f9ef8; }
.toast.warn { border-color: #d1a657; }
.toast.error { border-color: #d15757; }


.beian:hover {
	background-color: white;
	box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
}

.beian a {
	display: flex;
	align-items: center;
	text-decoration: none;
	color: #666;
}

.beian img {
	width: 16px;
	height: 16px;
	margin-right: 8px;
}

.beian .text {
	font-size: 13px;
}

@keyframes toast-in {
	to { opacity: 1; transform: translateY(0); }
}
@keyframes toast-out {
	to { opacity: 0; transform: translateY(-6px); }
}

/* 表情相关样式 */
.input-group {
	display: flex;
	gap: 4px;
	flex: 1;
}

.btn-emoji {
	font-size: 16px;
	padding: 8px 10px !important;
	min-width: auto !important;
	background: var(--panel);
	border-color: var(--border);
}

.btn-emoji:hover {
	border-color: var(--accent);
	background: rgba(79, 158, 248, 0.1);
}

.emoji-panel {
	background: var(--panel);
	border: 1px solid var(--border);
	border-radius: 6px;
	margin-bottom: 8px;
	padding: 6px;
	position: relative;
	z-index: 100;
	box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.emoji-panel.hidden {
	display: none;
}

.emoji-grid {
	display: grid;
	grid-template-columns: repeat(8, 1fr);
	gap: 2px;
}

.emoji-btn {
	background: transparent;
	border: none;
	border-radius: 4px;
	padding: 4px;
	cursor: pointer;
	font-size: 18px;
	line-height: 1;
	transition: background-color 0.15s;
	width: 100%;
	aspect-ratio: 1;
	display: flex;
	align-items: center;
	justify-content: center;
}

.emoji-btn:hover {
	background: rgba(79, 158, 248, 0.15);
}

.emoji-btn:active {
	background: rgba(79, 158, 248, 0.3);
	transform: scale(0.95);
}

/* SEO内容区域样式 */
.game-info {
	margin-top: 40px;
	padding: 20px;
	border-top: 1px solid var(--border);
	background: var(--panel);
}

.seo-content {
	max-width: 800px;
	margin: 0 auto;
	color: var(--text);
	line-height: 1.6;
}

.seo-content h2 {
	font-size: 24px;
	font-weight: 600;
	margin-bottom: 16px;
	color: var(--accent);
}

.seo-content h3 {
	font-size: 20px;
	font-weight: 600;
	margin-top: 24px;
	margin-bottom: 12px;
	color: var(--text);
}

.seo-content p {
	margin-bottom: 16px;
	font-size: 16px;
}

.seo-content ul {
	margin-bottom: 16px;
	padding-left: 20px;
}

.seo-content li {
	margin-bottom: 8px;
	font-size: 16px;
}

.seo-content strong {
	color: var(--accent);
	font-weight: 600;
}

/* 屏幕阅读器专用样式 */
.sr-only {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border: 0;
}

/* 表单组样式 */
.form-group {
	margin-bottom: 16px;
}

.form-group label {
	display: block;
	margin-bottom: 6px;
	font-weight: 500;
	color: var(--text);
}