/* v6.60: Global floating chat ball */
.chat-fab-wrap {
    position: fixed;
    right: 18px;
    bottom: 90px;
    z-index: 998;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 10px;
    touch-action: none;
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}
.chat-fab-wrap.dragging { cursor: grabbing; }

.chat-fab-btn {
    width: 52px; height: 52px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    background: linear-gradient(135deg, #0ea5e9, #6366f1);
    box-shadow: 0 6px 24px rgba(14,165,233,0.4), 0 2px 8px rgba(0,0,0,0.3);
    display: flex; align-items: center; justify-content: center;
    position: relative;
    transition: transform 0.2s, box-shadow 0.2s;
}
.chat-fab-btn:hover { transform: scale(1.08); box-shadow: 0 8px 30px rgba(14,165,233,0.5), 0 4px 12px rgba(0,0,0,0.4); }
.chat-fab-btn:active { transform: scale(0.95); }
.chat-fab-btn svg { width: 24px; height: 24px; fill: #fff; }
.chat-fab-avatar {
    width: 100%; height: 100%;
    border-radius: 50%;
    object-fit: cover;
    position: absolute;
    top: 0; left: 0;
    border: 2px solid rgba(255,255,255,0.3);
}

.chat-fab-badge {
    position: absolute; top: -4px; right: -6px;
    min-width: 18px; height: 18px; padding: 0 5px;
    border-radius: 999px;
    background: linear-gradient(135deg, #ff4d4d, #e11d48);
    color: #fff; font-size: 11px; font-weight: 800;
    display: none; align-items: center; justify-content: center;
    box-shadow: 0 0 0 2px rgba(10,13,15,0.9), 0 3px 10px rgba(225,29,72,0.6);
    animation: chatFabBadgePulse 1.6s infinite;
}
@keyframes chatFabBadgePulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

.chat-fab-panel {
    display: none;
    width: 320px;
    max-height: 480px;
    border-radius: 20px;
    background: linear-gradient(160deg, rgba(15,23,42,0.92), rgba(11,15,25,0.95));
    backdrop-filter: blur(28px);
    -webkit-backdrop-filter: blur(28px);
    border: 1px solid rgba(56,189,248,0.2);
    box-shadow: 0 20px 60px rgba(0,0,0,0.6), 0 8px 24px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.08);
    flex-direction: column;
    overflow: hidden;
    animation: chatFabPanelIn 0.22s cubic-bezier(0.34,1.56,0.64,1);
}
.chat-fab-wrap.open .chat-fab-panel { display: flex; }
@keyframes chatFabPanelIn {
    from { opacity: 0; transform: translateY(16px) scale(0.94); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.chat-fab-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 14px 16px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.chat-fab-header span {
    font-size: 1em; font-weight: 700; color: #f1f5f9;
    display: flex; align-items: center; gap: 8px;
}
.chat-fab-header svg { width: 18px; height: 18px; fill: #38bdf8; }
.chat-fab-close {
    background: rgba(255,255,255,0.08); border: none; color: #94a3b8;
    width: 28px; height: 28px; border-radius: 50%; cursor: pointer;
    font-size: 16px; display: flex; align-items: center; justify-content: center;
    transition: background 0.2s;
}
.chat-fab-close:hover { background: rgba(255,255,255,0.15); color: #fff; }

.chat-fab-list {
    flex: 1; overflow-y: auto; padding: 8px;
    display: flex; flex-direction: column; gap: 4px;
}
.chat-fab-list::-webkit-scrollbar { width: 4px; }
.chat-fab-list::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }

.chat-fab-list-item {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 12px; border-radius: 12px;
    cursor: pointer; transition: background 0.15s;
    position: relative;
}
.chat-fab-list-item:hover { background: rgba(255,255,255,0.06); }
.chat-fab-list-item .cfa-avatar {
    width: 36px; height: 36px; border-radius: 50%;
    object-fit: cover; border: 1px solid rgba(56,189,248,0.3);
    flex-shrink: 0;
}
.chat-fab-list-item .cfa-avatar-placeholder {
    width: 36px; height: 36px; border-radius: 50%;
    background: linear-gradient(135deg, #1e293b, #334155);
    display: flex; align-items: center; justify-content: center;
    border: 1px solid rgba(56,189,248,0.3); flex-shrink: 0;
}
.chat-fab-list-item .cfa-avatar-placeholder svg { width: 18px; height: 18px; fill: #64748b; }
.chat-fab-list-item .cfa-info { flex: 1; overflow: hidden; }
.chat-fab-list-item .cfa-name {
    font-size: 0.9em; font-weight: 600; color: #e2e8f0;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.chat-fab-list-item .cfa-last {
    font-size: 0.75em; color: #64748b;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    margin-top: 2px;
}
.chat-fab-list-item .cfa-unread {
    min-width: 18px; height: 18px; padding: 0 5px;
    border-radius: 9px; background: #ef4444; color: #fff;
    font-size: 10px; font-weight: 700;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.chat-fab-list-item.group-entry {
    background: linear-gradient(135deg, rgba(14,165,233,0.08), rgba(99,102,241,0.08));
    border: 1px solid rgba(56,189,248,0.15);
    margin-bottom: 4px;
}
.chat-fab-list-item.group-entry .cfa-avatar-placeholder {
    background: linear-gradient(135deg, #0ea5e9, #6366f1);
}
.chat-fab-list-item.group-entry .cfa-avatar-placeholder svg { fill: #fff; }
.chat-fab-list-item.group-entry .cfa-member-count {
    font-size: 0.7em; color: #38bdf8; margin-top: 2px;
}

.chat-fab-chat {
    display: none;
    flex-direction: column;
    flex: 1;
    max-height: 480px;
}
.chat-fab-wrap.open .chat-fab-chat.active { display: flex; }
.chat-fab-wrap.open .chat-fab-list { display: none; }
.chat-fab-wrap.open .chat-fab-header { display: none; }

.chat-fab-chat-header {
    display: flex; align-items: center; gap: 10px;
    padding: 12px 14px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.chat-fab-back {
    background: transparent; border: 1px solid #475569; color: #94a3b8;
    padding: 2px 10px; border-radius: 6px; cursor: pointer;
    font-size: 14px; transition: all 0.15s;
}
.chat-fab-back:hover { border-color: #38bdf8; color: #38bdf8; }
.chat-fab-peer-name { font-weight: 600; color: #38bdf8; font-size: 0.95em; }

.chat-fab-messages {
    flex: 1; overflow-y: auto; padding: 10px;
    display: flex; flex-direction: column; gap: 8px;
    min-height: 280px; max-height: 340px;
}
.chat-fab-messages::-webkit-scrollbar { width: 4px; }
.chat-fab-messages::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }

.cfm-msg {
    max-width: 80%; padding: 8px 12px; border-radius: 12px;
    font-size: 0.85em; line-height: 1.4; word-break: break-word;
}
.cfm-msg.sent {
    align-self: flex-end;
    background: linear-gradient(135deg, rgba(14,165,233,0.25), rgba(99,102,241,0.2));
    border: 1px solid rgba(56,189,248,0.2);
    color: #e2e8f0;
}
.cfm-msg.received {
    align-self: flex-start;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.08);
    color: #e2e8f0;
}
.cfm-msg .cfm-sender {
    font-size: 0.7em; color: #38bdf8; font-weight: 600;
    margin-bottom: 2px;
}
.cfm-msg .cfm-time {
    font-size: 0.65em; color: #64748b; margin-top: 4px;
}
.cfm-empty {
    text-align: center; color: #475569; font-size: 0.85em;
    padding: 40px 20px;
}

.chat-fab-input-row {
    display: flex; gap: 8px; padding: 10px;
    border-top: 1px solid rgba(255,255,255,0.08);
}
.chat-fab-input {
    flex: 1; padding: 8px 12px; border-radius: 10px;
    background: rgba(0,0,0,0.3); border: 1px solid rgba(255,255,255,0.1);
    color: #e2e8f0; font-size: 0.85em; outline: none;
    transition: border-color 0.15s;
}
.chat-fab-input:focus { border-color: rgba(56,189,248,0.4); }
.chat-fab-input::placeholder { color: #475569; }
.chat-fab-send {
    padding: 8px 14px; border-radius: 10px; border: none;
    background: linear-gradient(135deg, #0ea5e9, #6366f1);
    color: #fff; font-size: 0.85em; font-weight: 600;
    cursor: pointer; transition: opacity 0.15s;
}
.chat-fab-send:hover { opacity: 0.85; }
.chat-fab-send:disabled { opacity: 0.4; cursor: not-allowed; }