Demo/Assets/style.css

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;700&display=swap');

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --border-color: #30363d;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --accent-color: #58a6ff;
    --user-msg-bg: #21262d;
    --bot-msg-bg: #161b22;
    --danger-color: #f85149;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
}

.app-container {
    display: grid;
    grid-template-columns: 240px 1fr; /* Bố cục 5 cột có thể quá phức tạp, 2 cột (1 cho menu, 1 cho chat) hiệu quả hơn */
    height: 100vh;
}

/* --- Sidebar (Menu) --- */
.sidebar {
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: 20px;
}

.sidebar-header h3 {
    font-size: 1.2rem;
    margin-bottom: 24px;
}

.menu ul {
    list-style-type: none;
}

.menu li a {
    display: block;
    padding: 10px 15px;
    text-decoration: none;
    color: var(--text-secondary);
    border-radius: 6px;
    transition: background-color 0.2s, color 0.2s;
}

.menu li a:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.menu li.active a {
    background-color: rgba(88, 166, 255, 0.1);
    color: var(--accent-color);
    font-weight: 500;
}

/* --- Chat Container --- */
.chat-container {
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
}

.chat-header {
    padding: 20px 30px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
}

.chat-header h2 {
    font-size: 1.25rem;
}

.chat-header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.chat-body {
    flex-grow: 1;
    overflow-y: auto;
    padding: 20px 30px;
}

/* --- Tin nhắn --- */
.message-row {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 20px;
    max-width: 80%;
}

.bot-row {
    justify-content: flex-start;
}

.user-row {
    justify-content: flex-end;
    margin-left: auto; /* Đẩy tin nhắn người dùng sang phải */
}

.avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    background-color: var(--bg-tertiary);
}

.bot-msg, .user-msg {
    padding: 12px 16px;
    border-radius: 18px;
    line-height: 1.6;
    border: 1px solid var(--border-color);
}

.bot-msg {
    background-color: var(--bot-msg-bg);
    border-top-left-radius: 4px;
}

.user-msg {
    background-color: var(--user-msg-bg);
    border-top-right-radius: 4px;
}

/* --- Hiệu ứng đang gõ --- */
.typing {
    color: var(--text-secondary);
    padding: 10px 30px;
    font-style: italic;
    animation: pulse 1.5s infinite ease-in-out;
}

@keyframes pulse {
    0% { opacity: 0.5; }
    50% { opacity: 1; }
    100% { opacity: 0.5; }
}

/* --- Chat Footer & Form --- */
.chat-footer {
    padding: 15px 30px;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
}

.chat-form {
    display: flex;
    align-items: center;
    gap: 10px;
    background-color: var(--bg-primary);
    border-radius: 8px;
    padding: 5px;
    border: 1px solid var(--border-color);
}

.input-wrapper {
    flex-grow: 1;
    position: relative;
    display: flex;
    align-items: center;
}

.input-wrapper input[type="text"] {
    width: 100%;
    background: none;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 1rem;
    padding: 10px;
}

.input-wrapper input[type="text"]:disabled {
    cursor: not-allowed;
    color: var(--text-secondary);
}

.icon-btn, .send-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s, color 0.2s;
}

.icon-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.send-btn {
    background-color: var(--accent-color);
    color: var(--bg-primary);
    border-radius: 50%;
    width: 38px;
    height: 38px;
    transition: background-color 0.2s;
}

.send-btn:hover {
    background-color: #79c0ff;
}

.send-btn svg {
    width: 20px;
    height: 20px;
    transform: translateX(1px);
}

/* --- File Card --- */
#fileCard {
    display: none; /* Ẩn mặc định */
    align-items: center;
    gap: 8px;
    background-color: var(--bg-tertiary);
    padding: 5px 10px;
    border-radius: 6px;
    margin-left: 10px;
    font-size: 0.9rem;
    position: absolute;
}

#fileName {
    max-width: 200px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

#removeFile {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.2rem;
    line-height: 1;
}

#removeFile:hover {
    color: var(--danger-color);
}

/* --- Scrollbar --- */
.chat-body::-webkit-scrollbar {
    width: 8px;
}
.chat-body::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}
.chat-body::-webkit-scrollbar-thumb {
    background-color: var(--bg-tertiary);
    border-radius: 10px;
    border: 2px solid var(--bg-secondary);
}