:root {
    --chatbot-primary: #0ea5e9;
    --chatbot-primary-dark: #0284c7;
    --chatbot-header-bg: #1e293b;
    --chatbot-user-bg: #0ea5e9;
    --chatbot-bot-bg: #f1f5f9;
    --chatbot-text-light: #ffffff;
    --chatbot-text-dark: #1e293b;
    --chatbot-text-muted: #94a3b8;
    --chatbot-shadow: 0 8px 32px rgba(0, 0, 0, 0.18);
    --chatbot-radius: 16px;
    --chatbot-btn-size: 60px;
    --chatbot-width: 380px;
    --chatbot-max-height: 600px;
    --chatbot-z: 1060;
}

.chatbot-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: var(--chatbot-z);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

/* --- Floating Button --- */
.chatbot-btn {
    width: var(--chatbot-btn-size);
    height: var(--chatbot-btn-size);
    border-radius: 50%;
    border: none;
    background: linear-gradient(135deg, var(--chatbot-primary), var(--chatbot-primary-dark));
    color: var(--chatbot-text-light);
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(14, 165, 233, 0.4);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.chatbot-btn:hover {
    transform: scale(1.08);
    box-shadow: 0 6px 24px rgba(14, 165, 233, 0.5);
}

.chatbot-btn:active {
    transform: scale(0.95);
}

.chatbot-btn .btn-pulse {
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    border: 2px solid var(--chatbot-primary);
    opacity: 0;
    animation: chatbotPulse 2s ease-in-out infinite;
}

@keyframes chatbotPulse {
    0% { transform: scale(1); opacity: 0.6; }
    100% { transform: scale(1.35); opacity: 0; }
}

.chatbot-btn.hidden {
    display: none;
}

/* --- Chat Window --- */
.chatbot-window {
    position: fixed;
    bottom: 100px;
    right: 24px;
    width: var(--chatbot-width);
    max-height: var(--chatbot-max-height);
    background: #fff;
    border-radius: var(--chatbot-radius);
    box-shadow: var(--chatbot-shadow);
    display: none;
    flex-direction: column;
    overflow: hidden;
    transform-origin: bottom right;
    animation: chatbotSlideUp 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.chatbot-window.open {
    display: flex;
}

@keyframes chatbotSlideUp {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.96);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* --- Header --- */
.chatbot-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--chatbot-header-bg);
    color: var(--chatbot-text-light);
    flex-shrink: 0;
}

.chatbot-header-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.chatbot-header-info {
    flex: 1;
    min-width: 0;
}

.chatbot-header-title {
    font-size: 0.95rem;
    font-weight: 600;
    display: block;
    line-height: 1.3;
}

.chatbot-header-status {
    font-size: 0.72rem;
    color: #4ade80;
    display: flex;
    align-items: center;
    gap: 4px;
}

.chatbot-header-status::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #4ade80;
    display: inline-block;
}

.chatbot-close-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    color: var(--chatbot-text-light);
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease;
    flex-shrink: 0;
}

.chatbot-close-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* --- Messages Area --- */
.chatbot-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    min-height: 300px;
    max-height: 420px;
}

.chatbot-messages::-webkit-scrollbar {
    width: 5px;
}

.chatbot-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chatbot-messages::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 10px;
}

/* --- Messages --- */
.message {
    max-width: 85%;
    padding: 10px 14px;
    border-radius: 14px;
    font-size: 0.88rem;
    line-height: 1.5;
    position: relative;
    word-wrap: break-word;
    animation: messageFadeIn 0.25s ease;
}

@keyframes messageFadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.message-user {
    align-self: flex-end;
    background: var(--chatbot-user-bg);
    color: var(--chatbot-text-light);
    border-bottom-right-radius: 4px;
}

.message-bot {
    align-self: flex-start;
    background: var(--chatbot-bot-bg);
    color: var(--chatbot-text-dark);
    border-bottom-left-radius: 4px;
}

.message-content ul {
    margin: 4px 0;
    padding-left: 20px;
}

.message-content li {
    margin-bottom: 2px;
}

.message-content strong {
    font-weight: 600;
}

.message-time {
    font-size: 0.65rem;
    margin-top: 4px;
    opacity: 0.7;
    display: block;
}

.message-user .message-time {
    text-align: right;
    color: rgba(255, 255, 255, 0.8);
}

.message-bot .message-time {
    color: var(--chatbot-text-muted);
}

.message-actions {
    display: none;
    gap: 4px;
    margin-top: 4px;
}

.message-bot:hover .message-actions {
    display: flex;
}

.message-copy-btn {
    background: none;
    border: none;
    color: var(--chatbot-text-muted);
    font-size: 0.7rem;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 4px;
    transition: background 0.2s ease;
}

.message-copy-btn:hover {
    background: #e2e8f0;
    color: var(--chatbot-text-dark);
}

/* --- Welcome Message --- */
.welcome-message {
    text-align: center;
    padding: 20px 12px;
    color: var(--chatbot-text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
}

.welcome-message .welcome-icon {
    font-size: 2.5rem;
    margin-bottom: 8px;
    display: block;
}

.welcome-message strong {
    color: var(--chatbot-text-dark);
}

/* --- Typing Indicator --- */
.typing-indicator {
    align-self: flex-start;
    background: var(--chatbot-bot-bg);
    padding: 12px 18px;
    border-radius: 14px;
    border-bottom-left-radius: 4px;
    display: flex;
    align-items: center;
    gap: 6px;
    animation: messageFadeIn 0.25s ease;
}

.typing-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--chatbot-text-muted);
    animation: typingBounce 1.4s ease-in-out infinite;
}

.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-6px); }
}

/* --- Input Area --- */
.chatbot-input-area {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    border-top: 1px solid #e2e8f0;
    background: #fff;
    flex-shrink: 0;
}

.chatbot-input {
    flex: 1;
    border: 1px solid #e2e8f0;
    border-radius: 24px;
    padding: 10px 16px;
    font-size: 0.88rem;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    font-family: inherit;
}

.chatbot-input:focus {
    border-color: var(--chatbot-primary);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
}

.chatbot-input::placeholder {
    color: var(--chatbot-text-muted);
}

.chatbot-send-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: var(--chatbot-primary);
    color: var(--chatbot-text-light);
    font-size: 0.95rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease, transform 0.15s ease;
    flex-shrink: 0;
}

.chatbot-send-btn:hover:not(:disabled) {
    background: var(--chatbot-primary-dark);
    transform: scale(1.05);
}

.chatbot-send-btn:active:not(:disabled) {
    transform: scale(0.95);
}

.chatbot-send-btn:disabled {
    background: #cbd5e1;
    cursor: not-allowed;
}

.chatbot-char-count {
    font-size: 0.68rem;
    color: var(--chatbot-text-muted);
    padding-right: 4px;
}

/* --- Clear Chat --- */
.chatbot-clear-btn {
    background: none;
    border: none;
    color: var(--chatbot-text-muted);
    font-size: 0.72rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: background 0.2s ease;
    display: flex;
    align-items: center;
    gap: 4px;
    margin: 4px 16px 0;
    width: fit-content;
}

.chatbot-clear-btn:hover {
    background: #f1f5f9;
    color: #ef4444;
}

/* --- Error Message --- */
.message-error {
    align-self: flex-start;
    background: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
    border-bottom-left-radius: 4px;
}

/* --- Toast for copy feedback --- */
.chatbot-toast {
    position: fixed;
    bottom: 170px;
    right: 30px;
    background: var(--chatbot-header-bg);
    color: var(--chatbot-text-light);
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 0.78rem;
    box-shadow: var(--chatbot-shadow);
    z-index: 1070;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.chatbot-toast.show {
    opacity: 1;
}

/* --- Mobile Responsive --- */
@media (max-width: 576px) {
    .chatbot-container {
        bottom: 16px;
        right: 16px;
    }

    .chatbot-window {
        position: fixed;
        bottom: 0;
        right: 0;
        left: 0;
        top: 0;
        width: 100%;
        max-height: 100%;
        border-radius: 0;
    }

    .chatbot-window.open {
        animation: chatbotSlideUpMobile 0.3s cubic-bezier(0.22, 1, 0.36, 1);
    }

    @keyframes chatbotSlideUpMobile {
        from {
            opacity: 0;
            transform: translateY(30px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    .chatbot-messages {
        max-height: none;
        flex: 1;
    }

    .chatbot-btn {
        width: 54px;
        height: 54px;
        font-size: 1.3rem;
    }
}