*{margin:0;padding:0;box-sizing:border-box}
:root{--primary:#1a73e8;--primary-hover:#1557b0;--danger:#dc3545;--success:#28a745;--bg:#f8f9fa;--card:#fff;--border:#e0e0e0;--text:#333;--text-light:#666;--shadow:0 2px 8px rgba(0,0,0,0.08);--radius:8px}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;overflow-x:hidden}
.hidden{display:none!important}
button{cursor:pointer;border:none;border-radius:var(--radius);padding:8px 16px;font-size:14px;transition:all .2s}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-hover)}
.btn-danger{background:var(--danger);color:#fff}
.btn-danger:hover{background:#c82333}
.btn-success{background:var(--success);color:#fff}
.btn-success:hover{background:#218838}
.btn-outline{background:transparent;border:1px solid var(--border);color:var(--text)}
.btn-outline:hover{background:var(--bg)}
input,select{padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius);font-size:14px;width:100%;outline:none;transition:border .2s}
input:focus{border-color:var(--primary)}
.container{max-width:1200px;margin:0 auto;padding:16px}
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;margin-bottom:16px}
.nav{background:#fff;box-shadow:0 1px 4px rgba(0,0,0,0.1);padding:12px 20px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100}
.nav-brand{font-size:18px;font-weight:700;color:var(--primary)}
.nav-links{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.nav-links button{padding:6px 12px;font-size:13px;position:relative}
.nav-user{display:flex;align-items:center;gap:8px}
.btn-sound{font-size:16px;padding:6px 10px;min-width:36px;display:flex;align-items:center;justify-content:center}
.btn-sound.muted{opacity:.5}
.nav-btn-friends{position:relative}
.unread-dot{position:absolute;top:2px;right:2px;width:8px;height:8px;background:var(--danger);border-radius:50%;border:1px solid #fff}
#auth-page{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:20px}
.auth-box{background:#fff;border-radius:12px;box-shadow:0 4px 20px rgba(0,0,0,0.1);padding:40px;width:100%;max-width:400px}
.auth-box h2{text-align:center;margin-bottom:24px;color:var(--primary)}
.auth-box .form-group{margin-bottom:16px}
.auth-box label{display:block;margin-bottom:6px;font-size:13px;color:var(--text-light)}
.auth-box .btn-primary{width:100%;padding:12px;font-size:15px;margin-top:8px}
.auth-switch{text-align:center;margin-top:16px;font-size:13px;color:var(--text-light)}
.auth-switch a{color:var(--primary);cursor:pointer;text-decoration:none}
.tab-bar{display:flex;gap:0;border-bottom:2px solid var(--border);margin-bottom:16px}
.tab-bar button{padding:10px 20px;background:none;border:none;border-bottom:2px solid transparent;margin-bottom:-2px;font-size:14px;color:var(--text-light);transition:all .2s}
.tab-bar button.active{color:var(--primary);border-bottom-color:var(--primary);font-weight:600}
.lobby-layout{display:grid;grid-template-columns:1fr 300px;gap:16px}
.room-list{display:grid;gap:12px}
.room-item{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);gap:12px}
.room-info{display:flex;flex-direction:column;gap:4px;flex:1}
.room-info .players{font-size:13px;color:var(--text-light)}
.room-status{font-size:12px;padding:4px 8px;border-radius:4px;white-space:nowrap}
.room-status.waiting{background:#fff3cd;color:#856404}
.room-status.playing{background:#d4edda;color:#155724}
.chat-box{display:flex;flex-direction:column;height:400px;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.chat-messages{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:8px}
.chat-msg{padding:8px 12px;border-radius:8px;max-width:85%;word-break:break-word}
.chat-msg.self{align-self:flex-end;background:#e3f2fd}
.chat-msg.other{align-self:flex-start;background:#f5f5f5}
.chat-msg.system{align-self:center;background:#fff3cd;font-size:12px;color:#856404;padding:4px 12px}
.chat-msg .meta{font-size:11px;color:var(--text-light);margin-bottom:2px}
.chat-msg .text{font-size:14px}
.chat-input{display:flex;padding:8px;gap:8px;border-top:1px solid var(--border)}
.chat-input input{flex:1}
.chat-input button{white-space:nowrap}
.room-waiting-page{display:flex;justify-content:center;padding:20px}
.room-waiting-card{background:#fff;border-radius:12px;box-shadow:0 4px 20px rgba(0,0,0,0.1);padding:30px;width:100%;max-width:600px}
.room-waiting-card h3{text-align:center;margin-bottom:20px}
.room-players{display:flex;align-items:center;justify-content:center;gap:20px;margin-bottom:20px}
.room-player-slot{text-align:center;padding:16px;background:var(--bg);border-radius:var(--radius);min-width:160px}
.slot-label{font-size:12px;color:var(--text-light);margin-bottom:8px}
.slot-name{font-size:16px;font-weight:600;margin-bottom:8px}
.room-vs{font-size:24px;font-weight:700;color:var(--text-light)}
.ready-badge{font-size:11px;padding:3px 8px;border-radius:4px;background:#e2e3e5;color:#383d41}
.ready-badge.ready{background:#d4edda;color:#155724}
.ready-badge.not-ready{background:#f8d7da;color:#721c24}
.room-spectators{text-align:center;margin-bottom:16px;padding:8px;background:var(--bg);border-radius:var(--radius)}
.room-actions{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-bottom:16px}
.room-actions button{min-width:80px}
.room-chat{margin-top:12px}
.chess-container{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;padding:16px;align-items:flex-start}
.chess-container.dual-mode{gap:8px;flex-wrap:nowrap;align-items:flex-start}
.chess-container.dual-mode .timer-section{display:none}
.chess-board-wrapper{position:relative}
.chess-board{position:relative;background:#f0d9b5;border:3px solid #8b4513;border-radius:4px}
.chess-canvas{display:block}
.dual-board{}
.game-panel{width:280px;display:flex;flex-direction:column;gap:12px}
.game-info{padding:12px;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow)}
.game-info h3{margin-bottom:8px;font-size:15px}
.game-actions{display:flex;flex-wrap:wrap;gap:8px}
.game-actions button{flex:1;min-width:70px;padding:8px 12px;font-size:13px}
.move-history{max-height:200px;overflow-y:auto;font-size:12px;padding:8px;background:#f9f9f9;border-radius:4px}
.timer-section{margin-bottom:8px}
.timer-bar{display:flex;align-items:center;justify-content:space-between;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:8px 16px;gap:12px}
.timer-player{display:flex;flex-direction:column;align-items:center;gap:2px}
.timer-think{display:flex;flex-direction:column;align-items:center;gap:2px}
.timer-label{font-size:11px;color:var(--text-light);font-weight:600}
.timer-value{font-family:'Courier New',monospace;font-size:18px;font-weight:700;color:var(--text);padding:2px 8px;border-radius:4px;min-width:60px;text-align:center}
.timer-value.timer-active{background:var(--primary);color:#fff}
.timer-value.timer-low{animation:timerPulse 1s ease-in-out infinite}
.timer-value.timer-low.timer-active{background:var(--danger)}
.timer-value.timer-overtime{color:var(--danger)}
@keyframes timerPulse{0%,100%{opacity:1}50%{opacity:.6}}
.profile-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px}
.stat-card{text-align:center;padding:20px;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow)}
.stat-card .value{font-size:28px;font-weight:700;color:var(--primary)}
.stat-card .label{font-size:13px;color:var(--text-light);margin-top:4px}
.friend-list{display:flex;flex-direction:column;gap:8px}
.friend-item{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow)}
.friend-item .info{display:flex;flex-direction:column}
.friend-item .name{font-weight:600;font-size:14px}
.friend-item .status{font-size:12px;color:var(--text-light)}
.online-dot{width:8px;height:8px;border-radius:50%;display:inline-block;margin-right:4px}
.online-dot.on{background:var(--success)}
.online-dot.off{background:#ccc}
.pagination{display:flex;align-items:center;justify-content:center;gap:4px;margin-top:16px;flex-wrap:wrap}
.pagination button{min-width:36px;height:36px;padding:0 8px;font-size:13px;border-radius:4px;background:#fff;border:1px solid var(--border);color:var(--text)}
.pagination button.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.pagination button:disabled{opacity:.5;cursor:not-allowed}
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.5);display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px}
.modal{background:#fff;border-radius:12px;padding:24px;max-width:500px;width:100%;max-height:90vh;overflow-y:auto;box-shadow:0 8px 32px rgba(0,0,0,0.2)}
.modal h3{margin-bottom:16px}
.modal .form-group{margin-bottom:12px}
.toast{position:fixed;top:20px;right:20px;padding:12px 20px;border-radius:var(--radius);color:#fff;font-size:14px;z-index:9999;animation:slideIn .3s ease;max-width:320px;word-break:break-word}
.toast.success{background:var(--success)}
.toast.error{background:var(--danger)}
.toast.info{background:var(--primary)}
@keyframes slideIn{from{transform:translateX(100%);opacity:0}to{transform:translateX(0);opacity:1}}
.difficulty-select{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:16px 0}
.difficulty-select button{padding:12px;font-size:14px;border-radius:var(--radius);border:2px solid var(--border);background:#fff;transition:all .2s}
.difficulty-select button:hover{border-color:var(--primary);color:var(--primary)}
.board-mode-select{display:flex;gap:8px;margin-top:8px}
.board-mode-btn{padding:10px 16px;font-size:13px;border:2px solid var(--border);border-radius:var(--radius);background:#fff;transition:all .2s}
.board-mode-btn.active{border-color:var(--primary);color:var(--primary);background:#e3f2fd}
.admin-panel{padding:20px}
.admin-panel table{width:100%;border-collapse:collapse;font-size:13px}
.admin-panel th,.admin-panel td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--border)}
.admin-panel th{background:var(--bg);font-weight:600}
.log-level{padding:2px 6px;border-radius:3px;font-size:11px;font-weight:600}
.log-level.INFO{background:#d4edda;color:#155724}
.log-level.WARN{background:#fff3cd;color:#856404}
.log-level.ERROR{background:#f8d7da;color:#721c24}
.log-level.DEBUG{background:#e2e3e5;color:#383d41}
.page-size-select{display:flex;gap:8px;align-items:center;margin-bottom:12px}
.page-size-select button{padding:4px 10px;font-size:12px;border-radius:4px;border:1px solid var(--border);background:#fff}
.page-size-select button.active{background:var(--primary);color:#fff;border-color:var(--primary)}
#notification-popup{position:fixed;bottom:20px;right:20px;z-index:9000;display:flex;flex-direction:column;gap:8px;max-width:320px}
.notif-item{background:#fff;border-radius:var(--radius);box-shadow:0 4px 16px rgba(0,0,0,0.15);padding:12px 16px;cursor:pointer;animation:slideIn .3s ease;border-left:4px solid var(--primary)}
.notif-item .notif-from{font-weight:600;font-size:13px;margin-bottom:4px}
.notif-item .notif-text{font-size:12px;color:var(--text-light)}
.matching-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.6);display:flex;align-items:center;justify-content:center;z-index:900}
.matching-box{background:#fff;border-radius:12px;padding:40px;text-align:center}
.matching-box .spinner{width:40px;height:40px;border:4px solid var(--border);border-top-color:var(--primary);border-radius:50%;margin:0 auto 16px;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.form-group{margin-bottom:12px}
.form-group label{display:block;margin-bottom:6px;font-size:13px;color:var(--text-light)}
@media(max-width:900px){
.chess-container{flex-direction:column;align-items:center;padding:8px}
.chess-container.dual-mode{flex-direction:row;flex-wrap:nowrap;justify-content:center;align-items:flex-start}
.game-panel{width:100%;max-width:420px}
}
@media(max-width:768px){
.lobby-layout{grid-template-columns:1fr}
.nav{padding:8px 12px}
.nav-links{gap:4px}
.nav-links button{padding:4px 8px;font-size:11px}
.nav-brand{font-size:15px}
.nav-user span{font-size:12px}
.container{padding:8px}
.admin-panel{padding:8px}
.admin-panel table{font-size:11px}
.admin-panel th,.admin-panel td{padding:6px 4px}
.profile-grid{grid-template-columns:1fr 1fr}
.room-players{flex-direction:column;gap:12px}
.room-player-slot{min-width:auto;width:100%}
.timer-bar{padding:6px 8px;gap:8px}
.timer-value{font-size:14px;min-width:50px}
.timer-label{font-size:10px}
.game-actions button{min-width:60px;padding:6px 10px;font-size:12px}
.chat-box{height:280px}
.room-waiting-card{padding:16px}
.card{padding:14px}
.auth-box{padding:24px}
.stat-card{padding:12px}
.stat-card .value{font-size:22px}
}
@media(max-width:480px){
.nav{flex-direction:column;gap:6px;padding:8px}
.nav-links{justify-content:center}
.nav-user{align-self:center}
.profile-grid{grid-template-columns:1fr}
.difficulty-select{grid-template-columns:1fr}
.board-mode-select{flex-direction:column}
.game-actions{flex-wrap:wrap}
.game-actions button{min-width:calc(50% - 4px)}
.room-actions{flex-wrap:wrap}
.room-actions button{min-width:calc(50% - 4px)}
}