/* ===== Auth overlay ===== */
        /* 登录页「场」：道场深绿渐变底 + 缓慢漂移柔光 + 淡绿呢纹理 + 暗角（与开场 splash 同色系 #2f4a3e）*/
        #auth-overlay {
            position: fixed; inset: 0; z-index: 200; overflow: hidden;
            display: flex; align-items: center; justify-content: center;
            background: radial-gradient(ellipse 120% 85% at 50% 32%, #3a5c4b 0%, #2a4238 46%, #182821 100%);
        }
        #auth-overlay::before {   /* 两团缓慢漂移的柔光，像远处灯笼，给纵深感 */
            content: ''; position: absolute; inset: -20%; pointer-events: none;
            background:
                radial-gradient(circle at 30% 26%, rgba(122,230,166,0.10), transparent 40%),
                radial-gradient(circle at 72% 72%, rgba(244,211,94,0.07), transparent 42%);
            animation: authDrift 16s ease-in-out infinite alternate;
        }
        #auth-overlay::after {    /* 极淡绿呢斜纹 + 暗角，压住四周聚焦中心 */
            content: ''; position: absolute; inset: 0; pointer-events: none;
            background:
                repeating-linear-gradient(135deg, rgba(255,255,255,0.012) 0 2px, transparent 2px 6px),
                radial-gradient(ellipse at 50% 50%, transparent 55%, rgba(0,0,0,0.5) 100%);
        }
        @keyframes authDrift { from { transform: translate(-3%,-2%) scale(1.05); } to { transform: translate(3%,2%) scale(1.12); } }
        @media (prefers-reduced-motion: reduce) { #auth-overlay::before { animation: none; } }
        #auth-box {
            position: relative; z-index: 1;
            background: linear-gradient(165deg, rgba(30,50,41,0.96), rgba(18,30,25,0.97));
            border: 1px solid rgba(244,211,94,0.18);
            border-radius: 16px; padding: 32px; width: 340px;
            box-shadow: 0 24px 60px rgba(0,0,0,0.55);
            animation: authBoxIn 0.55s cubic-bezier(0.22,1,0.36,1) both;
        }
        @keyframes authBoxIn { from { opacity: 0; transform: translateY(14px) scale(0.98); } to { opacity: 1; transform: none; } }
        #auth-box h1 { text-align: center; color: #f4d35e; margin-bottom: 4px; font-size: 24px; display: flex; align-items: center; justify-content: center; gap: 10px; }
        .auth-logo { width: 44px; height: 44px; border-radius: 10px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.4), 0 0 18px rgba(244,211,94,0.28); vertical-align: middle;
            animation: authLogoIn 0.7s cubic-bezier(0.22,1,0.36,1) 0.08s both; }
        @keyframes authLogoIn { from { opacity: 0; transform: scale(0.72) translateY(6px); } to { opacity: 1; transform: none; } }
        .auth-sub { text-align: center; color: #9db9a9; font-size: 12px; margin-bottom: 20px; letter-spacing: 0.5px;
            animation: authBoxIn 0.6s ease 0.14s both; }
        .auth-tabs { display: flex; margin-bottom: 20px; border-radius: 8px; overflow: hidden; }
        .auth-tab {
            flex: 1; padding: 8px; border: none; cursor: pointer; font-size: 14px; font-weight: bold;
            background: rgba(255,255,255,0.06); color: #aaa; transition: all 0.15s;
        }
        .auth-tab.active { background: #3a86ff; color: #fff; }
        .auth-field { width: 100%; background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.15);
            color: #fff; border-radius: 6px; padding: 10px 12px; font-size: 14px; margin-bottom: 10px; }
        .auth-field::placeholder { color: #888; }
        .auth-submit { width: 100%; padding: 11px; background: #3a86ff; color: white; border: none;
            border-radius: 6px; font-weight: bold; font-size: 15px; cursor: pointer; transition: filter 0.15s; }
        .auth-submit:hover { filter: brightness(1.15); }
        .auth-hint { text-align: center; font-size: 12px; color: #888; margin-top: 10px; }
        .auth-link { color: #6ca0ff; cursor: pointer; }
        .auth-link:hover { text-decoration: underline; }
        #auth-error { color: #ff6b6b; font-size: 13px; min-height: 18px; margin-top: 8px; text-align: center; }

        /* ===== User bar ===== */
        #user-bar {
            display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
            background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08);
            border-radius: 10px; padding: 8px 14px; margin-bottom: 10px;
        }
        #user-bar .uname { font-weight: bold; color: #f4d35e; }
        #user-bar .gold  { color: #ffd700; }
        #user-bar .bar-spacer { flex: 1; }
        #latency {
            position: fixed; top: 10px; right: 12px; z-index: 60;
            font-size: 10px; color: #06d6a0; font-weight: bold; white-space: nowrap;
            background: rgba(0,0,0,0.45); padding: 2px 7px; border-radius: 10px;
        }
        #user-bar button { background: transparent; border: 1px solid rgba(255,255,255,0.2);
            color: #aaa; border-radius: 5px; padding: 4px 12px; font-size: 12px; cursor: pointer; }
        .icon-btn {
            width: 36px; height: 32px; padding: 0; font-size: 16px; line-height: 1;
            display: inline-flex; align-items: center; justify-content: center;
            background: rgba(255,255,255,0.1) !important; border: 1px solid rgba(255,255,255,0.2) !important;
            border-radius: 7px !important; color: #fff !important; cursor: pointer;
        }
        .icon-btn:hover { background: rgba(255,255,255,0.2) !important; }
        .icon-btn.danger { background: rgba(214,40,40,0.25) !important; border-color: rgba(214,40,40,0.5) !important; }

        /* ===== 准备按钮（牌桌顶栏）===== */
        button.start {
            background: #06d6a0; color: #0a1f1a; border: none; border-radius: 5px;
            padding: 8px 16px; font-weight: bold; font-size: 14px; cursor: pointer; transition: filter 0.15s;
        }
        button.start.readied { background: #ff9f1c; color: #1a1a1a; }
        button.start:hover:not(:disabled) { filter: brightness(1.15); }
        button.start:disabled { opacity: 0.4; cursor: not-allowed; }