#chat-widget {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.chat-bubble {
    width: 60px;
    height: 60px;
    background: #0b1d3a;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    transition: transform 0.3s, box-shadow 0.3s;
}

.chat-bubble:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 16px rgba(0,0,0,0.2);
}

.chat-window {
    position: fixed;
    bottom: 100px;
    right: 20px;
    width: 380px;
    height: 520px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.15);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.chat-header {
    background: #0b1d3a;
    color: white;
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-header h3 {
    font-size: 16px;
    font-weight: 600;
    margin: 0;
}

.chat-close {
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    line-height: 1;
    padding: 0;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: background 0.2s;
}

.chat-close:hover {
    background: rgba(255,255,255,0.1);
}

.chat-messages {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    background: #f8f9fa;
}

.chat-message {
    margin-bottom: 12px;
    padding: 10px 14px;
    border-radius: 12px;
    max-width: 80%;
    word-wrap: break-word;
    line-height: 1.4;
    font-size: 14px;
}

.chat-message.user {
    background: #0b1d3a;
    color: white;
    margin-left: auto;
    border-bottom-right-radius: 4px;
}

.chat-message.bot {
    background: white;
    color: #333;
    border: 1px solid #e1e5e9;
    border-bottom-left-radius: 4px;
}

.chat-input {
    padding: 12px 16px;
    background: white;
    border-top: 1px solid #e1e5e9;
    display: flex;
    gap: 8px;
    align-items: flex-end;
}

#chat-upload-btn {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: background 0.2s;
    flex-shrink: 0;
}

#chat-upload-btn:hover {
    background: #f0f0f0;
}

.chat-input textarea {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid #e1e5e9;
    border-radius: 8px;
    resize: none;
    font-size: 14px;
    font-family: inherit;
    line-height: 1.4;
}

.chat-input textarea:focus {
    outline: none;
    border-color: #0b1d3a;
}

.chat-input button#chat-send {
    background: #c8a45c;
    color: white;
    border: none;
    padding: 10px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    transition: background 0.2s;
    flex-shrink: 0;
}

.chat-input button#chat-send:hover {
    background: #a8863c;
}

/* 响应式 */
@media (max-width: 480px) {
    .chat-window {
        width: calc(100vw - 40px);
        height: calc(100vh - 120px);
        bottom: 90px;
        right: 20px;
    }
}