/* General Reset and Base Styles */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.app-container {
    width: 100%;
    max-width: 600px;
    height: 90vh;
    display: flex;
    flex-direction: column;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    background-color: var(--bg-color);
    overflow: hidden;
}

.app-header {
    background-color: var(--header-bg-color);
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.header-content h1 {
    font-size: 1.5rem;
    font-weight: bold;
}

.header-actions {
    display: flex;
    gap: 10px;
}

.icon-button {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.2rem;
    cursor: pointer;
    transition: color 0.3s;
}

.icon-button:hover {
    color: var(--primary-color);
}

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

.messages-container {
    flex: 1;
    padding-bottom: 20px;
}

.welcome-message {
    text-align: center;
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.message {
    padding: 12px 15px;
    margin: 10px 0;
    border-radius: 8px;
    max-width: 80%;
    word-wrap: break-word;
    position: relative;
}

.user-message {
    background-color: var(--user-message-bg);
    color: var(--user-message-color);
    align-self: flex-end;
}

.bot-message {
    background-color: var(--bot-message-bg);
    color: var(--bot-message-color);
    align-self: flex-start;
}

.copy-button {
    position: absolute;
    top: 5px;
    right: 5px;
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1rem;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.3s;
}

.copy-button:hover {
    opacity: 1;
}

.typing-indicator {
    display: flex;
    justify-content: flex-start;
    padding: 10px;
}

.typing-bubble {
    display: flex;
    align-items: center;
    background-color: var(--bot-message-bg);
    border-radius: 8px;
    padding: 5px 12px;
}

.dots span {
    display: inline-block;
    width: 8px;
    height: 8px;
    margin: 0 3px;
    background-color: var(--text-color);
    border-radius: 50%;
    animation: blink 1.5s infinite;
}

.dots span:nth-child(2) {
    animation-delay: 0.2s;
}

.dots span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes blink {
    0%, 100% {
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
}

.chat-input-container {
    display: flex;
    padding: 15px;
    border-top: 1px solid var(--border-color);
}

.textarea-wrapper {
    flex-grow: 1;
}

textarea {
    resize: none;
    width: 100%;
    padding: 12px 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--input-bg-color);
    color: var(--text-color);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s ease-in-out;
}

textarea:focus {
    border-color: var(--primary-color);
}

.input-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 12px;
}

.char-counter {
    font-size: 0.9rem;
    color: var(--text-color);
}

.send-button {
    background: none;
    border: none;
    color: var(--primary-color);
    font-size: 1.2rem;
    cursor: pointer;
    transition: color 0.3s ease;
}

.send-button:hover {
    color: var(--primary-color-hover);
}

.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    padding: 12px 15px;
    border-radius: 8px;
    color: #fff;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.toast.success {
    background-color: #4caf50;
}

.toast.error {
    background-color: #f44336;
}

.toast.info {
    background-color: #2196f3;
}

/* Dark Mode */
:root.dark {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --header-bg-color: #1e1e1e;
    --border-color: #333;
    --primary-color: #bb86fc;
    --primary-color-hover: #3700b3;
    --user-message-bg: #424242;
    --user-message-color: #ffffff;
    --bot-message-bg: #3700b3;
    --bot-message-color: #ffffff;
    --input-bg-color: #1e1e1e;
}

/* Light Mode */
:root.light {
    --bg-color: #ffffff;
    --text-color: #000000;
    --header-bg-color: #f5f5f5;
    --border-color: #ccc;
    --primary-color: #6200ea;
    --primary-color-hover: #3700b3;
    --user-message-bg: #e0e0e0;
    --user-message-color: #000000;
    --bot-message-bg: #6200ea;
    --bot-message-color: #ffffff;
    --input-bg-color: #f5f5f5;
}

/* Responsive Design */
@media (max-width: 600px) {
    .app-container {
        width: 100%;
        height: 100vh;
        border-radius: 0;
    }

    .header-content h1 {
        font-size: 1.3rem;
    }

    .icon-button {
        font-size: 1rem;
    }

    .chat-input-container {
        flex-direction: column;
    }

    .input-actions {
        flex-direction: column;
        align-items: flex-start;
    }

    .char-counter {
        margin-bottom: 10px;
    }

    .send-button {
        align-self: flex-end;
    }
}