body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}

.chat-container {
    max-width: 600px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    padding: 20px;
    height: 80vh;
    display: flex;
    flex-direction: column;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.message-bubble {
    max-width: 80%;
    padding: 12px 16px;
    border-radius: 18px;
    position: relative;
    font-size: 0.95rem;
    line-height: 1.4;
    animation: fadeIn 0.3s ease-out;
}

.message-bot {
    background-color: #e9ecef;
    color: #333;
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}

.message-user {
    background-color: #0d6efd;
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}

.input-area {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #dee2e6;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Calculator Styles */
.calculator {
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
    background: #f8f9fa;
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.calc-display {
    width: 100%;
    height: 50px;
    margin-bottom: 10px;
    font-size: 1.5rem;
    text-align: right;
    padding: 10px;
    background: #fff;
    border: 1px solid #ced4da;
    border-radius: 5px;
}

.calc-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.calc-btn {
    padding: 15px 0;
    font-size: 1.2rem;
    border: none;
    border-radius: 5px;
    background: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    cursor: pointer;
    transition: background 0.2s;
}

.calc-btn:active {
    background: #e9ecef;
    transform: translateY(1px);
}

.calc-btn.op {
    background: #e7f1ff;
    color: #0d6efd;
}

.calc-btn.clear {
    background: #ffebe9;
    color: #dc3545;
}

.calc-btn.equal {
    background: #0d6efd;
    color: white;
    grid-column: span 4;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    body {
        background: linear-gradient(135deg, #2c3e50 0%, #000000 100%);
        color: #e0e0e0;
    }

    .chat-container {
        background: rgba(30, 30, 30, 0.9);
        color: #e0e0e0;
    }

    .message-bot {
        background-color: #495057;
        color: #e0e0e0;
    }

    .navbar {
        background-color: #212529 !important;
        border-bottom: 1px solid #495057;
    }

    .navbar-brand,
    .nav-link {
        color: #e0e0e0 !important;
    }

    /* Calculator Dark Mode */
    .calculator {
        background: #343a40;
    }

    .calc-display {
        background: #495057;
        color: white;
        border-color: #6c757d;
    }

    .calc-btn {
        background: #495057;
        color: white;
    }

    .calc-btn.op {
        background: #3d4650;
        color: #6ea8fe;
    }

    .calc-btn.clear {
        background: #5c3838;
        color: #ea868f;
    }
}