/* --- Color Palette & Variables --- */
:root {
    --bg-main: #f4f4f9;
    --bg-container: #fff;
    --text-dark: #040404;
    --text-light: #fff;
    --border-color: #eee;

    --primary-accent: #7c3aed; /* Vibrant Violet */
    --primary-accent-dark: #6d28d9; /* Darker Violet for hover */
    --secondary-accent: #dbbbfb; /* Lavender from logo */
    
    --bubble-assistant-bg: #e9e9eb;
    --bubble-user-bg: var(--primary-accent);
}

/* --- General and Responsive Layout --- */
html {
    font-size: 16px;
}

html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

*, *::before, *::after {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-dark);
    display: flex;
    justify-content: center;
    align-items: center;
}

#chat-wrapper {
    width: 100%;
    max-width: 800px;
    height: 90vh;
    max-height: 950px;
    background-color: var(--bg-container);
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* --- Header --- */
#chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

#logo-container {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.logo-svg {
    width: 28px;
    height: 28px;
}

#logo-container h1 {
    margin: 0;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-dark);
}

#new-chat-button {
    background-color: #f0f0f0;
    color: var(--text-dark);
    border: 1px solid #ddd;
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background-color 0.2s;
}

#new-chat-button:hover {
    background-color: #e6e6e6;
}

/* --- Chat Container & Messages --- */
#chat-container {
    flex-grow: 1;
    overflow-y: auto;
    padding: 20px;
}

.message {
    margin-bottom: 1rem; /* 16px spacing */
    display: flex;
    flex-direction: column;
}

.message-content {
    max-width: 85%;
    padding: 10px 15px;
    border-radius: 18px;
    line-height: 1.5;
    word-wrap: break-word;
}

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

.message.assistant { align-items: flex-start; }
.message.assistant .message-content {
    background-color: var(--bubble-assistant-bg);
    color: var(--text-dark);
    border-bottom-left-radius: 4px;
}

/* --- Input Form --- */
#chat-form {
    display: flex;
    align-items: flex-end;
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    gap: 0.75rem;
}

#message-input {
    flex-grow: 1;
    padding: 12px 16px;
    border: 1px solid #ddd;
    border-radius: 24px;
    font-size: 1rem;
    line-height: 1.5;
    resize: none;
    overflow-y: auto;
    height: 50px;
    max-height: 168px; /* ~6 lines */
}

#message-input:focus {
    outline: none;
    border-color: var(--primary-accent);
    box-shadow: 0 0 0 2px rgba(124, 58, 237, 0.25);
}

#chat-form button {
    background-color: var(--primary-accent);
    color: var(--text-light);
    border: none;
    border-radius: 24px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.2s;
    height: 50px;
    flex-shrink: 0;
    padding: 12px 20px;
}

#chat-form button:hover {
    background-color: var(--primary-accent-dark);
}

#chat-form button:disabled {
    background-color: var(--secondary-accent);
    cursor: not-allowed;
}

/* --- Markdown & Code Block Styling --- */
.message.assistant .message-content p { margin: 0.5em 0; }
.message.assistant .message-content p:first-child { margin-top: 0; }
.message.assistant .message-content p:last-child { margin-bottom: 0; }
.message.assistant .message-content ul, ol { padding-left: 25px; margin: 10px 0; }
.message.assistant .message-content p > code, li > code { background-color: rgba(0, 0, 0, 0.08); padding: 2px 5px; border-radius: 4px; font-family: 'Consolas', 'Monaco', 'Courier New', monospace; }
.message.assistant .message-content pre { position: relative; background-color: #1e1e1e; color: #dcdcdc; padding: 15px; padding-top: 2.5em; border-radius: 8px; overflow-x: auto; font-family: 'Consolas', 'Monaco', 'Courier New', monospace; font-size: 0.9em; margin: 1em 0; }
.copy-code-button { position: absolute; top: 0.5em; right: 0.5em; padding: 0.3em 0.6em; border: 1px solid #555; border-radius: 4px; background-color: #555; color: #eee; cursor: pointer; font-size: 0.8em; transition: background-color 0.2s, color 0.2s; }
.copy-code-button:hover { background-color: #666; }

/* --- Media Queries --- */
@media (min-width: 1400px) { #chat-wrapper { max-width: 1000px; } }
@media (max-width: 768px) {
    body { align-items: flex-start; }
    #chat-wrapper { height: 100%; max-height: 100%; border-radius: 0; box-shadow: none; }
    #chat-header { padding: 0.75rem 1rem; }
    #chat-container { padding: 1rem; }
    #chat-form { padding: 0.5rem; }
}