.msa-widget {
    --msa-primary: #6366f1;
    --msa-primary-hover: #4f46e5;
    --msa-bg: #ffffff;
    --msa-text: #1f2937;
    --msa-text-muted: #6b7280;
    --msa-border: #e5e7eb;
    --msa-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    position: fixed;
    bottom: 24px;
    z-index: 999999;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
}

.msa-position-right {
    right: 24px;
}

.msa-position-left {
    left: 24px;
}

.msa-toggle-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--msa-primary);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--msa-shadow);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.msa-toggle-btn:hover {
    background: var(--msa-primary-hover);
    transform: scale(1.05);
}

.msa-toggle-btn .msa-icon-close {
    display: none;
}

.msa-widget.msa-open .msa-toggle-btn .msa-icon-chat {
    display: none;
}

.msa-widget.msa-open .msa-toggle-btn .msa-icon-close {
    display: block;
}

.msa-container {
    position: absolute;
    bottom: 80px;
    width: 380px;
    max-width: calc(100vw - 48px);
    height: 520px;
    max-height: calc(100vh - 150px);
    background: var(--msa-bg);
    border-radius: 16px;
    box-shadow: var(--msa-shadow);
    display: none;
    flex-direction: column;
    overflow: hidden;
    animation: msa-slide-up 0.3s ease-out;
}

.msa-position-right .msa-container {
    right: 0;
}

.msa-position-left .msa-container {
    left: 0;
}

.msa-widget.msa-open .msa-container {
    display: flex;
}

@keyframes msa-slide-up {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.msa-header {
    background: var(--msa-primary);
    color: white;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.msa-header-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.msa-avatar {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.msa-header-text {
    display: flex;
    flex-direction: column;
}

.msa-bot-name {
    font-weight: 600;
    font-size: 15px;
}

.msa-status {
    font-size: 12px;
    opacity: 0.9;
    display: flex;
    align-items: center;
    gap: 4px;
}

.msa-status::before {
    content: '';
    width: 8px;
    height: 8px;
    background: #22c55e;
    border-radius: 50%;
}

.msa-minimize-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: background 0.2s;
}

.msa-minimize-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.msa-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    background: #f9fafb;
}

.msa-message {
    max-width: 85%;
    animation: msa-fade-in 0.3s ease-out;
}

@keyframes msa-fade-in {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.msa-bot-message {
    align-self: flex-start;
}

.msa-user-message {
    align-self: flex-end;
}

.msa-message-content {
    padding: 12px 16px;
    border-radius: 16px;
    font-size: 14px;
    line-height: 1.5;
}

.msa-bot-message .msa-message-content {
    background: white;
    color: var(--msa-text);
    border: 1px solid var(--msa-border);
    border-bottom-left-radius: 4px;
}

.msa-user-message .msa-message-content {
    background: var(--msa-primary);
    color: white;
    border-bottom-right-radius: 4px;
}

.msa-input-area {
    padding: 16px 20px;
    background: white;
    border-top: 1px solid var(--msa-border);
    display: flex;
    gap: 12px;
}

.msa-input {
    flex: 1;
    border: 1px solid var(--msa-border);
    border-radius: 24px;
    padding: 12px 20px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.msa-input:focus {
    border-color: var(--msa-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.msa-send-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--msa-primary);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: background 0.2s, transform 0.2s;
}

.msa-send-btn:hover {
    background: var(--msa-primary-hover);
    transform: scale(1.05);
}

.msa-send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.msa-typing {
    display: flex;
    gap: 4px;
    padding: 12px 16px;
}

.msa-typing span {
    width: 8px;
    height: 8px;
    background: var(--msa-text-muted);
    border-radius: 50%;
    animation: msa-bounce 1.4s infinite ease-in-out;
}

.msa-typing span:nth-child(1) { animation-delay: -0.32s; }
.msa-typing span:nth-child(2) { animation-delay: -0.16s; }

@keyframes msa-bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

@media (max-width: 480px) {
    .msa-widget {
        bottom: 16px;
        right: 16px !important;
        left: 16px !important;
    }
    
    .msa-container {
        width: 100%;
        max-width: none;
        right: 0 !important;
        left: 0 !important;
        bottom: 72px;
        height: calc(100vh - 120px);
    }
    
    .msa-toggle-btn {
        position: fixed;
        right: 16px;
        bottom: 16px;
    }
}