:root {
    --bg: #121212;
    --chat-bg: #1e1e1e;
    --user-msg-bg: #2a2a2a;
    --bot-msg-bg: #8b5cf6;
    --text-color: #e0e0e0;
    --bot-text-color: #ffffff;
    --input-bg: #2c2c2c;
    --input-border: #383838;
    --accent-color: #8b5cf6;
    --yellow-color: #facc15;
    --code-bg: #2c2c2c;
    --code-border: #444444;
    --shadow: rgba(0, 0, 0, 0.4);
    --border-radius: 12px;
    --transition-duration: 0.2s;
}

* {
    box-sizing: border-box;
    font-family: 'Tajawal', sans-serif;
}
body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text-color);
    display: flex;
    height: 100vh;
    overflow: hidden;
    transition: margin-right 0.3s ease-in-out;
}

.sidebar-menu {
    position: fixed;
    top: 0;
    right: -300px; /* مخفية في البداية */
    width: 280px;
    height: 100%;
    background: var(--chat-bg);
    box-shadow: -2px 0 15px var(--shadow);
    transition: right 0.3s ease-in-out;
    padding: 20px;
    display: flex;
    flex-direction: column;
    z-index: 1000;
}
.sidebar-menu.open {
    right: 0;
}

.chat-list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}
.chat-list-header h2 {
    margin: 0;
    color: var(--yellow-color);
    font-size: 1.5rem;
}
.close-sidebar-btn {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 2rem;
    cursor: pointer;
}

.chat-list {
    flex-grow: 1;
    overflow-y: auto;
}
.chat-item {
    display: block;
    background: var(--user-msg-bg);
    color: var(--text-color);
    padding: 10px;
    border-radius: 8px;
    margin-bottom: 10px;
    cursor: pointer;
    text-decoration: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.chat-item:hover {
    background: #444;
}

.main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    position: relative;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    background: var(--chat-bg);
    border-bottom: 1px solid var(--input-border);
}

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

.chat-actions button, .menu-toggle-btn {
    background: var(--user-msg-bg);
    color: var(--text-color);
    border: none;
    padding: 10px 15px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    transition: background-color var(--transition-duration);
}
.chat-actions button:hover, .menu-toggle-btn:hover {
    background: #444;
}

.chat-container {
    flex-grow: 1;
    padding: 20px;
    overflow-y: auto;
    scroll-behavior: smooth;
}
.message {
    display: flex;
    margin-bottom: 20px;
    max-width: 85%;
    word-wrap: break-word;
    animation: fadeIn 0.3s ease-in-out;
}
.message.user {
    margin-left: auto;
    flex-direction: row-reverse;
}
.message.bot {
    margin-right: auto;
    flex-direction: row;
}
.message-bubble {
    padding: 14px;
    border-radius: var(--border-radius);
    font-size: 1rem;
    line-height: 1.6;
}
.message.user .message-bubble {
    background: var(--user-msg-bg);
    border-bottom-left-radius: 0;
}
.message.bot .message-bubble {
    background: var(--bot-msg-bg);
    color: var(--bot-text-color);
    border-bottom-right-radius: 0;
    text-align: right;
}

.message-bubble img, .message-bubble video {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    margin-top: 10px;
}

.input-area {
    display: flex;
    padding: 10px 20px;
    border-top: 1px solid var(--input-border);
    background: var(--chat-bg);
    align-items: center;
}
#message-input {
    flex-grow: 1;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--border-radius);
    padding: 12px 18px;
    color: var(--text-color);
    font-size: 1rem;
    outline: none;
    transition: border-color var(--transition-duration);
    margin-left: 10px;
}
#message-input:focus {
    border-color: var(--accent-color);
}
#send-btn {
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    padding: 12px 20px;
    font-size: 1rem;
    cursor: pointer;
    transition: transform var(--transition-duration), opacity var(--transition-duration);
    font-weight: 700;
}
#send-btn:hover {
    transform: scale(1.05);
    opacity: 0.9;
}
#send-btn:disabled {
    background: #444;
    cursor: not-allowed;
}

.file-upload-btn {
    position: relative;
    background: var(--user-msg-bg);
    color: var(--text-color);
    border: none;
    padding: 12px 15px;
    border-radius: var(--border-radius);
    cursor: pointer;
    margin-right: 10px;
}
.file-upload-btn input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.typing-indicator {
    display: none;
    text-align: right;
    padding: 10px;
    color: var(--muted);
    font-style: italic;
}

/* تنسيقات خاصة للمحتوى من الـ API */
.message-bubble p { margin: 0 0 10px 0; }
.message-bubble p:last-child { margin-bottom: 0; }
.message-bubble ul, .message-bubble ol {
    margin-top: 0;
    padding-right: 20px;
}
.message-bubble ul li, .message-bubble ol li {
    margin-bottom: 5px;
}

.code-block {
    background-color: var(--code-bg);
    padding: 15px;
    border-radius: 8px;
    direction: ltr;
    text-align: left;
    margin-top: 10px;
    overflow-x: auto;
    white-space: pre-wrap;
    font-family: 'Courier New', Courier, monospace;
    border: 1px solid var(--code-border);
}
.code-block pre {
    margin: 0;
}

.search-results-section {
    margin-top: 15px;
}

.search-results-section h3 {
    margin-bottom: 10px;
    color: var(--yellow-color);
    font-size: 1.2rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 5px;
}

.search-results-section ul {
    list-style: none;
    padding: 0;
}

.search-results-section li {
    background: #2c2c2c;
    border-radius: 8px;
    padding: 10px;
    margin-bottom: 10px;
}

.search-results-section a {
    color: var(--bot-text-color);
    text-decoration: none;
    font-weight: bold;
    display: block;
}

.search-results-section a:hover {
    text-decoration: underline;
}

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