* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-color: #f4f4f4;
    --text-color: #201d1d;
    --input-bg: #e8e8e8;
    --button-bg: #201d1d;
    --button-text: #f4f4f4;
    --button-hover: #3a3636;
    --message-user-bg: #201d1d;
    --message-user-text: #f4f4f4;
    --message-bot-bg: #e8e8e8;
    --message-bot-text: #201d1d;
    --error-color: #201d1d;
    --loading-color: #201d1d;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
}

.chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
    width: 100%;
    max-width: 100%;
}

.chat-header {
    display: flex;
    justify-content: flex-end;
    padding: 0.5rem 1rem;
    flex-shrink: 0;
}

.clear-button {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.85rem;
    background: none;
    color: var(--text-color);
    border: 1px solid rgba(0, 0, 0, 0.15);
    border-radius: 20px;
    font-size: 0.8rem;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity 0.2s ease, border-color 0.2s ease;
}

.clear-button:hover {
    opacity: 1;
    border-color: rgba(0, 0, 0, 0.35);
}

.clear-button svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    scroll-behavior: smooth;
}

.messages-container::-webkit-scrollbar {
    width: 8px;
}

.messages-container::-webkit-scrollbar-track {
    background: var(--bg-color);
}

.messages-container::-webkit-scrollbar-thumb {
    background: #cccccc;
    border-radius: 4px;
}

.message {
    max-width: 80%;
    padding: 0.75rem 1rem;
    border-radius: 12px;
    word-wrap: break-word;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

.message.error {
    align-self: center;
    background-color: #ffebee;
    color: #c62828;
    text-align: center;
    max-width: 90%;
}

.message-content {
    line-height: 1.6;
}

.message-content p {
    margin: 0 0 0.5em;
}

.message-content p:last-child {
    margin-bottom: 0;
}

.message-content h1,
.message-content h2,
.message-content h3,
.message-content h4 {
    margin: 0.75em 0 0.25em;
    font-weight: 600;
    line-height: 1.3;
}

.message-content h1:first-child,
.message-content h2:first-child,
.message-content h3:first-child {
    margin-top: 0;
}

.message-content ul,
.message-content ol {
    margin: 0.25em 0 0.5em;
    padding-left: 1.5em;
}

.message-content li {
    margin-bottom: 0.2em;
}

.message-content code {
    background-color: rgba(0, 0, 0, 0.08);
    padding: 0.1em 0.3em;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.message.user .message-content code {
    background-color: rgba(255, 255, 255, 0.15);
}

.message-content pre {
    background-color: rgba(0, 0, 0, 0.08);
    padding: 0.75em 1em;
    border-radius: 6px;
    overflow-x: auto;
    margin: 0.5em 0;
}

.message-content pre code {
    background: none;
    padding: 0;
}

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

.message-content em {
    font-style: italic;
}

.message-content hr {
    border: none;
    border-top: 1px solid rgba(0, 0, 0, 0.15);
    margin: 0.75em 0;
}

.message.user .message-content hr {
    border-top-color: rgba(255, 255, 255, 0.3);
}

.message-content a {
    color: inherit;
    text-decoration: underline;
}

.message-time {
    font-size: 0.75rem;
    margin-top: 0.5rem;
    opacity: 0.6;
}

.input-container {
    padding: 1rem;
    padding-bottom: max(1rem, env(safe-area-inset-bottom));
    background-color: var(--bg-color);
    flex-shrink: 0;
}

.chat-form {
    display: flex;
    gap: 0.5rem;
}

.message-input {
    flex: 1;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    font-family: inherit;
    background-color: var(--input-bg);
    color: var(--text-color);
    border: none;
    border-radius: 20px;
    outline: none;
    transition: background-color 0.2s ease;
    resize: none;
    overflow-y: hidden;
    line-height: 1.4;
    min-height: 44px;
    max-height: 120px;
    overflow-y: auto;
}

.message-input:focus {
    background-color: #eeeeee;
}

.message-input::placeholder {
    color: #999999;
}

.send-button {
    padding: 0.75rem 1.25rem;
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    border-radius: 25px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

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

.send-button:active {
    transform: scale(0.95);
}

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

.send-button svg {
    width: 20px;
    height: 20px;
}

.loading-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background-color: var(--message-bot-bg);
    color: var(--loading-color);
    border-radius: 12px;
    align-self: flex-start;
    max-width: 80px;
}

.loading-dots {
    display: flex;
    gap: 4px;
}

.loading-dot {
    width: 8px;
    height: 8px;
    background-color: var(--loading-color);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out both;
}

.loading-dot:nth-child(1) {
    animation-delay: -0.32s;
}

.loading-dot:nth-child(2) {
    animation-delay: -0.16s;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .message {
        max-width: 90%;
    }

    .message-input {
        font-size: 16px; /* Prevents zoom on iOS */
    }
}

@media (max-width: 480px) {
    .messages-container {
        padding: 0.75rem;
        gap: 0.75rem;
    }

    .input-container {
        padding: 0.75rem;
    }

    .send-button {
        padding: 0.75rem;
    }
}