.chat-assist-widget {
    /* --- CẤU HÌNH MÀU SẮC MỚI (RED THEME) --- */
    --chat-color-primary: #b7443d;       /* Màu đỏ chủ đạo do bạn chọn */
    --chat-color-secondary: #8a2b25;     /* Màu đỏ đô đậm hơn (dùng cho hover) */
    --chat-color-tertiary: #b7443d;
    --chat-color-light: #fdf2f2;         /* Màu nền nhạt pha chút đỏ (thay vì xanh nhạt) */
    --chat-color-surface: #ffffff;
    --chat-color-text: #1f2937;
    --chat-color-text-light: #6b7280;
    --chat-color-border: #e5e7eb;

    /* Gradient Đỏ Đô: Từ màu gốc -> Đỏ sẫm -> Đỏ rượu */
    --chat-gradient-primary: linear-gradient(8deg, #b7443d 0%, #8a2b25 50%, #5e1b17 100%);

    /* Đổ bóng màu đỏ (RGB của #b7443d là 183, 68, 61) */
    --chat-shadow-sm: 0 1px 3px rgba(183, 68, 61, 0.1);
    --chat-shadow-md: 0 4px 6px rgba(183, 68, 61, 0.15);
    --chat-shadow-lg: 0 10px 15px rgba(183, 68, 61, 0.2);

    --chat-radius-sm: 8px;
    --chat-radius-md: 12px;
    --chat-radius-lg: 20px;
    --chat-radius-full: 9999px;
    --chat-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: 'Poppins', sans-serif;
}

.chat-assist-widget .chat-window {
    position: fixed;
    bottom: 90px;
    z-index: 1001;
    width: 380px;
    height: 580px;
    background: var(--chat-color-surface);
    border-radius: var(--chat-radius-lg);
    box-shadow: var(--chat-shadow-lg);
    border: 1px solid var(--chat-color-light);
    overflow: hidden;
    display: none;
    flex-direction: column;
    transition: var(--chat-transition);
    opacity: 0;
    transform: translateY(20px) scale(0.95);
}

.chat-assist-widget .chat-window.right-side {
    right: 20px;
}

.chat-assist-widget .chat-window.left-side {
    left: 20px;
}

.chat-assist-widget .chat-window.visible {
    display: flex;
    opacity: 1;
    transform: translateY(0) scale(1);
}

.chat-assist-widget .chat-header {
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    /* Sử dụng biến gradient mới */
    background: var(--chat-gradient-primary);
    color: white;
    position: relative;
}

.chat-assist-widget .chat-header-logo {
    width: 32px;
    height: 32px;
    border-radius: var(--chat-radius-sm);
    object-fit: contain;
    background: white;
    padding: 4px;
}

.chat-assist-widget .chat-header-title {
    font-size: 16px;
    font-weight: 600;
    color: white;
}

.chat-assist-widget .chat-close-btn {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--chat-transition);
    font-size: 18px;
    border-radius: var(--chat-radius-full);
    width: 28px;
    height: 28px;
}

.chat-assist-widget .chat-close-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-50%) scale(1.1);
}

.chat-assist-widget .chat-welcome {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 24px;
    text-align: center;
    width: 100%;
    max-width: 320px;
}

.chat-assist-widget .chat-welcome-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--chat-color-text);
    margin-bottom: 24px;
    line-height: 1.3;
}

.chat-assist-widget .chat-start-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 14px 20px;
    /* Sử dụng biến gradient mới */
    background: var(--chat-gradient-primary);
    color: white;
    border: none;
    border-radius: var(--chat-radius-md);
    cursor: pointer;
    font-size: 15px;
    transition: var(--chat-transition);
    font-weight: 600;
    font-family: inherit;
    margin-bottom: 16px;
    box-shadow: var(--chat-shadow-md);
}

.chat-assist-widget .chat-start-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--chat-shadow-lg);
}

.chat-assist-widget .chat-response-time {
    font-size: 14px;
    color: var(--chat-color-text-light);
    margin: 0;
}

.chat-assist-widget .chat-body {
    display: none;
    flex-direction: column;
    height: 100%;
}

.chat-assist-widget .chat-body.active {
    display: flex;
}

.chat-assist-widget .chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    background: #fffafa; /* Nền hơi ửng đỏ rất nhẹ cho ấm áp */
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.chat-assist-widget .chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-assist-widget .chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-assist-widget .chat-messages::-webkit-scrollbar-thumb {
    background-color: rgba(183, 68, 61, 0.3); /* Scrollbar màu đỏ nhạt */
    border-radius: var(--chat-radius-full);
}

.chat-assist-widget .chat-bubble {
    padding: 14px 18px;
    border-radius: var(--chat-radius-md);
    max-width: 85%;
    word-wrap: break-word;
    font-size: 14px;
    line-height: 1.6;
    position: relative;
    white-space: pre-line;
}

.chat-assist-widget .chat-bubble.user-bubble {
    /* Sử dụng biến gradient mới */
    background: var(--chat-gradient-primary);
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 4px;
    box-shadow: var(--chat-shadow-sm);
}

.chat-assist-widget .chat-bubble.bot-bubble {
    background: white;
    color: var(--chat-color-text);
    align-self: flex-start;
    border-bottom-left-radius: 4px;
    box-shadow: var(--chat-shadow-sm);
    border: 1px solid var(--chat-color-light);
}

/* Typing animation */
.chat-assist-widget .typing-indicator {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 14px 18px;
    background: white;
    border-radius: var(--chat-radius-md);
    border-bottom-left-radius: 4px;
    max-width: 80px;
    align-self: flex-start;
    box-shadow: var(--chat-shadow-sm);
    border: 1px solid var(--chat-color-light);
}

.chat-assist-widget .typing-dot {
    width: 8px;
    height: 8px;
    background: var(--chat-color-primary);
    border-radius: var(--chat-radius-full);
    opacity: 0.7;
    animation: typingAnimation 1.4s infinite ease-in-out;
}

.chat-assist-widget .typing-dot:nth-child(1) {
    animation-delay: 0s;
}

.chat-assist-widget .typing-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.chat-assist-widget .typing-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typingAnimation {
    0%, 60%, 100% {
        transform: translateY(0);
    }
    30% {
        transform: translateY(-4px);
    }
}

.chat-assist-widget .chat-controls {
    padding: 16px;
    background: var(--chat-color-surface);
    border-top: 1px solid var(--chat-color-light);
    display: flex;
    gap: 10px;
}

.chat-assist-widget .chat-textarea {
    height: auto;
    flex: 1;
    padding: 14px 16px;
    border: 1px solid var(--chat-color-light);
    border-radius: var(--chat-radius-md);
    background: var(--chat-color-surface);
    color: var(--chat-color-text);
    resize: none;
    font-family: inherit;
    font-size: 14px;
    line-height: 1.5;
    max-height: 120px;
    min-height: 48px;
    transition: var(--chat-transition);
}

.chat-assist-widget .chat-textarea:focus {
    outline: none;
    border-color: var(--chat-color-primary);
    box-shadow: 0 0 0 3px rgba(183, 68, 61, 0.2); /* Focus ring màu đỏ */
}

.chat-assist-widget .chat-textarea::placeholder {
    color: var(--chat-color-text-light);
}

.chat-assist-widget .chat-submit {
    padding: 0 1.2em;
    /* Sử dụng biến gradient mới */
    background: var(--chat-gradient-primary);
    color: white;
    border: none;
    border-radius: var(--chat-radius-md);
    width: 48px;
    height: 48px;
    cursor: pointer;
    transition: var(--chat-transition);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: var(--chat-shadow-sm);
}

.chat-assist-widget .chat-submit:hover {
    transform: scale(1.05);
    box-shadow: var(--chat-shadow-md);
}

.chat-assist-widget .chat-submit svg {
    width: 22px;
    height: 22px;
}

.chat-assist-widget .chat-launcher {
    position: fixed;
    bottom: 70px;
    height: 56px;
    border-radius: var(--chat-radius-full);
    /* Sử dụng biến gradient mới */
    background: var(--chat-gradient-primary);
    color: white;
    border: none;
    cursor: pointer;
    box-shadow: var(--chat-shadow-md);
    z-index: 999;
    transition: var(--chat-transition);
    display: flex;
    align-items: center;
    padding: 0 20px 0 16px;
    gap: 8px;
}

.chat-assist-widget .chat-launcher.right-side {
    right: 0px;
}

.chat-assist-widget .chat-launcher.left-side {
    left: 20px;
}

.chat-assist-widget .chat-launcher:hover {
    transform: scale(1.05);
    box-shadow: var(--chat-shadow-lg);
}

.chat-assist-widget .chat-launcher svg {
    width: 24px;
    height: 24px;
}

.chat-assist-widget .chat-launcher-text {
    font-weight: 600;
    font-size: 15px;
    white-space: nowrap;
}

.chat-assist-widget .chat-footer {
    padding: 10px;
    text-align: center;
    background: var(--chat-color-surface);
    border-top: 1px solid var(--chat-color-light);
}

.chat-assist-widget .chat-footer-link {
    color: var(--chat-color-primary);
    text-decoration: none;
    font-size: 12px;
    opacity: 0.8;
    transition: var(--chat-transition);
    font-family: inherit;
}

.chat-assist-widget .chat-footer-link:hover {
    opacity: 1;
}

.chat-assist-widget .suggested-questions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin: 12px 0;
    align-self: flex-start;
    max-width: 85%;
}

.chat-assist-widget .suggested-question-btn {
    background: #fdf2f2; /* Nền gợi ý hơi đỏ nhẹ */
    border: 1px solid var(--chat-color-light);
    border-radius: var(--chat-radius-md);
    padding: 10px 14px;
    text-align: left;
    font-size: 13px;
    color: var(--chat-color-text);
    cursor: pointer;
    transition: var(--chat-transition);
    font-family: inherit;
    line-height: 1.4;
}

.chat-assist-widget .suggested-question-btn:hover {
    background: var(--chat-color-light);
    border-color: var(--chat-color-primary);
}

.chat-assist-widget .chat-link {
    color: var(--chat-color-primary);
    text-decoration: underline;
    word-break: break-all;
    transition: var(--chat-transition);
}

.chat-assist-widget .chat-link:hover {
    color: var(--chat-color-secondary);
    text-decoration: underline;
}

.chat-assist-widget .user-registration {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 24px;
    text-align: center;
    width: 100%;
    max-width: 320px;
    display: none;
}

.chat-assist-widget .user-registration.active {
    display: block;
}

.chat-assist-widget .registration-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--chat-color-text);
    margin-bottom: 16px;
    line-height: 1.3;
}

.chat-assist-widget .registration-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 16px;
}

.chat-assist-widget .form-field {
    display: flex;
    flex-direction: column;
    gap: 4px;
    text-align: left;
}

.chat-assist-widget .form-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--chat-color-text);
}

.chat-assist-widget .form-input {
    margin: 0;
    padding: 12px 14px;
    border: 1px solid var(--chat-color-border);
    border-radius: var(--chat-radius-md);
    font-family: inherit;
    font-size: 14px;
    transition: var(--chat-transition);
}

.chat-assist-widget .form-input:focus {
    outline: none;
    border-color: var(--chat-color-primary);
    box-shadow: 0 0 0 3px rgba(183, 68, 61, 0.2); /* Focus ring đỏ */
}

.chat-assist-widget .form-input.error {
    border-color: #ef4444;
}

.chat-assist-widget .error-text {
    font-size: 12px;
    color: #ef4444;
    margin-top: 2px;
}

.chat-assist-widget .submit-registration {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 14px 20px;
    /* Sử dụng biến gradient mới */
    background: var(--chat-gradient-primary);
    color: white;
    border: none;
    border-radius: var(--chat-radius-md);
    cursor: pointer;
    font-size: 15px;
    transition: var(--chat-transition);
    font-weight: 600;
    font-family: inherit;
    box-shadow: var(--chat-shadow-md);
}

.chat-assist-widget .submit-registration:hover {
    transform: translateY(-2px);
    box-shadow: var(--chat-shadow-lg);
}

.chat-assist-widget .submit-registration:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}