/* 聊天室样式 - 现代简约风格 */
:root {
    --chat-primary: #4f46e5;
    --chat-primary-light: #6366f1;
    --chat-bg: #ffffff;
    --chat-border: #e5e7eb;
    --chat-text: #1f2937;
    --chat-text-light: #6b7280;
    --chat-msg-self: #4f46e5;
    --chat-msg-other: #f3f4f6;
}

.knn-chat {
    position: fixed;
    bottom: 24px;
    z-index: 99999;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
}
.knn-chat.pos-right { right: 24px; }
.knn-chat.pos-left { left: 24px; }

/* 悬浮按钮 */
.chat-btn {
    width: 56px;
    height: 56px;
    background: var(--chat-primary);
    border-radius: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
    transition: all 0.3s ease;
    position: relative;
}
.chat-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.5);
}
.chat-btn i {
    color: #fff;
    font-size: 24px;
}
.chat-btn .badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background: #ef4444;
    color: #fff;
    font-size: 11px;
    font-weight: 600;
    min-width: 20px;
    height: 20px;
    border-radius: 10px;
    display: none;
    align-items: center;
    justify-content: center;
    border: 2px solid #fff;
}

/* 聊天窗口 */
.chat-box {
    display: none;
    position: absolute;
    bottom: 70px;
    width: 380px;
    height: 520px;
    background: var(--chat-bg);
    border-radius: 16px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--chat-border);
}
.pos-right .chat-box { right: 0; }
.pos-left .chat-box { left: 0; }
.chat-box.open { display: flex; }

/* 头部 */
.chat-head {
    padding: 16px 20px;
    background: var(--chat-bg);
    border-bottom: 1px solid var(--chat-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.chat-head span {
    font-size: 16px;
    font-weight: 600;
    color: var(--chat-text);
    display: flex;
    align-items: center;
    gap: 8px;
}
.chat-head span i {
    color: var(--chat-primary);
    font-size: 20px;
}
.chat-close {
    width: 32px;
    height: 32px;
    background: #f3f4f6;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}
.chat-close:hover {
    background: #e5e7eb;
}
.chat-close i {
    color: var(--chat-text-light);
    font-size: 14px;
}

/* 消息区域 */
.chat-body {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    background: #fafafa;
}
.chat-body::-webkit-scrollbar {
    width: 4px;
}
.chat-body::-webkit-scrollbar-thumb {
    background: #d1d5db;
    border-radius: 2px;
}
.chat-body::-webkit-scrollbar-track {
    background: transparent;
}

/* 消息样式 */
.chat-msg {
    display: flex;
    margin-bottom: 16px;
    align-items: flex-end;
    animation: msgIn 0.3s ease;
}
@keyframes msgIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.chat-msg .avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    flex-shrink: 0;
    object-fit: cover;
    background: #e5e7eb;
}

.chat-msg .content {
    max-width: 65%;
    display: flex;
    flex-direction: column;
}

.chat-msg .head {
    display: flex;
    align-items: center;
    margin-bottom: 4px;
    gap: 8px;
}

.chat-msg .name {
    font-size: 12px;
    font-weight: 500;
    color: var(--chat-text-light);
}

.chat-msg .time {
    font-size: 11px;
    color: #9ca3af;
}

.chat-msg .text {
    padding: 12px 16px;
    font-size: 14px;
    line-height: 1.5;
    word-break: break-word;
    position: relative;
}

.chat-msg .del {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #9ca3af;
    cursor: pointer;
    font-size: 12px;
    opacity: 0;
    transition: opacity 0.2s;
    padding: 4px;
}
.chat-msg:hover .del { opacity: 1; }
.chat-msg .del:hover { color: #ef4444; }

/* 别人的消息 */
.chat-msg.other {
    flex-direction: row;
}
.chat-msg.other .avatar {
    margin-right: 10px;
}
.chat-msg.other .text {
    background: #fff;
    color: var(--chat-text);
    border-radius: 4px 16px 16px 16px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}
.chat-msg.other .del {
    right: -24px;
}

/* 自己的消息 */
.chat-msg.self {
    flex-direction: row-reverse;
}
.chat-msg.self .avatar {
    margin-left: 10px;
}
.chat-msg.self .content {
    align-items: flex-end;
}
.chat-msg.self .text {
    background: var(--chat-msg-self);
    color: #fff;
    border-radius: 16px 4px 16px 16px;
}
.chat-msg.self .del {
    left: -24px;
}

/* 底部输入区 */
.chat-foot {
    padding: 16px;
    background: var(--chat-bg);
    border-top: 1px solid var(--chat-border);
}
.chat-foot-inner {
    display: flex;
    gap: 10px;
    align-items: flex-end;
}
.chat-foot textarea {
    flex: 1;
    border: 1px solid var(--chat-border);
    border-radius: 12px;
    padding: 12px 16px;
    resize: none;
    font-size: 14px;
    line-height: 1.4;
    max-height: 80px;
    min-height: 44px;
    outline: none;
    transition: border-color 0.2s;
    font-family: inherit;
}
.chat-foot textarea:focus {
    border-color: var(--chat-primary);
}
.chat-foot textarea::placeholder {
    color: #9ca3af;
}
.chat-foot button {
    height: 44px;
    padding: 0 20px;
    background: var(--chat-primary);
    color: #fff;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
    flex-shrink: 0;
}
.chat-foot button:hover {
    background: var(--chat-primary-light);
}
.chat-foot button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 登录提示 */
.chat-tip {
    text-align: center;
    padding: 12px;
    color: var(--chat-text-light);
    font-size: 14px;
}
.chat-tip a {
    color: var(--chat-primary);
    text-decoration: none;
    font-weight: 500;
}
.chat-tip a:hover {
    text-decoration: underline;
}

/* 系统消息 */
.chat-sys {
    text-align: center;
    padding: 8px 16px;
    color: #9ca3af;
    font-size: 12px;
}

/* 卡片消息 */
.msg-card {
    display: flex;
    background: #fff;
    border: 1px solid var(--chat-border);
    border-radius: 12px;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    transition: all 0.2s;
    max-width: 260px;
}
.msg-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transform: translateY(-1px);
}
.chat-msg.self .msg-card {
    background: #fff;
}
.card-thumb {
    width: 70px;
    height: 70px;
    object-fit: cover;
    flex-shrink: 0;
}
.card-info {
    flex: 1;
    padding: 8px 10px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-width: 0;
}
.card-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--chat-text);
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.card-desc {
    font-size: 11px;
    color: var(--chat-text-light);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin: 4px 0;
}
.card-foot {
    display: flex;
    align-items: center;
    gap: 6px;
}
.card-tag {
    font-size: 10px;
    padding: 2px 6px;
    background: linear-gradient(135deg, #f093fb, #f5576c);
    color: #fff;
    border-radius: 4px;
}
.card-price {
    font-size: 13px;
    font-weight: 600;
    color: #ef4444;
}

/* 响应式 */
@media (max-width: 480px) {
    .knn-chat {
        bottom: 80px;
    }
    .chat-box {
        width: calc(100vw - 32px);
        height: 60vh;
        bottom: 70px;
    }
    .knn-chat.pos-right { right: 16px; }
    .knn-chat.pos-left { left: 16px; }
}