:root {
    --primary-color: #4A90E2;
    --secondary-color: #F4F6F8;
    --background-color: #ffffff;
    --sidebar-bg: #2C3E50;
    --sidebar-text: #ECF0F1;
    --sidebar-text-secondary: #95A5A6;
    --border-color: #EAECEF;
    --bot-message-bg: #F1F3F4;
    --bot-message-text: #34495E;
    --user-message-bg: var(--primary-color);
    --user-message-text: #ffffff;
    --font-family: 'Tajawal', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--secondary-color);
    color: var(--bot-message-text);
    margin: 0;
    height: 100vh;
    overflow: hidden;
}

#root {
    display: flex;
    height: 100vh;
}

.main-container {
    display: flex;
    width: 100%;
    height: 100%;
    background-color: var(--background-color);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

/* --- File Management Panel --- */
.file-panel {
    width: 350px;
    display: flex;
    flex-direction: column;
    padding: 24px;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
}

.file-panel h1 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 24px;
    text-align: center;
}

.upload-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 10px;
    background-color: var(--primary-color);
    color: white;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

.upload-button:hover {
    background-color: #357ABD;
}

.upload-button:active {
    transform: scale(0.98);
}

.file-list-container {
    margin-top: 32px;
    flex-grow: 1;
    overflow-y: auto;
}

.file-list-container h2 {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 16px;
    color: var(--sidebar-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--sidebar-text);
}

.file-item-icon {
    flex-shrink: 0;
    color: var(--primary-color);
}

.file-item-name {
    flex-grow: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.no-files-text {
    color: var(--sidebar-text-secondary);
    font-size: 14px;
    text-align: center;
    margin-top: 20px;
}

/* --- Chat Panel --- */
.chat-panel {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    height: 100vh;
    background-color: var(--background-color);
}

.chat-messages {
    flex-grow: 1;
    padding: 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.message {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    max-width: 80%;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.bot-avatar {
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
}

.user-avatar {
    background-color: var(--secondary-color);
    color: var(--primary-color);
}

.message-content-wrapper {
    display: flex;
    flex-direction: column;
}

.message-content {
    padding: 12px 18px;
    border-radius: 20px;
    font-size: 15px;
    line-height: 1.6;
}

.bot {
    align-self: flex-start;
}

.bot .message-content {
    background-color: var(--bot-message-bg);
    color: var(--bot-message-text);
    border-bottom-left-radius: 5px;
}

.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.user .message-content {
    background-color: var(--user-message-bg);
    color: var(--user-message-text);
    border-bottom-right-radius: 5px;
}

.chat-input-area {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    background-color: #F9FAFB;
}

.chat-input-form {
    display: flex;
    align-items: center;
    gap: 12px;
    background-color: var(--background-color);
    border-radius: 26px;
    padding: 6px;
    border: 1px solid var(--border-color);
}

.chat-input {
    flex-grow: 1;
    padding: 10px 16px;
    border: none;
    font-size: 16px;
    font-family: inherit;
    background-color: transparent;
    color: var(--bot-message-text);
}

.chat-input:focus {
    outline: none;
}

.chat-input:disabled {
    background-color: transparent;
}

.mic-button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background-color: transparent;
    color: #8A94A4;
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.mic-button:hover:not(:disabled) {
    background-color: var(--secondary-color);
    color: var(--primary-color);
}

.mic-button.listening {
    background-color: #ffeaea;
    color: #ff453a;
    animation: pulse 1.5s infinite;
}

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

.send-button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    cursor: pointer;
    transition: background-color 0.2s ease;
    flex-shrink: 0;
}

.send-button:disabled {
    background-color: #aeb5be;
    cursor: not-allowed;
}

.send-button:not(:disabled):hover {
    background-color: #357ABD;
}

.loader {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(255, 69, 58, 0.4);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(255, 69, 58, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(255, 69, 58, 0);
    }
}


/* Responsive Design */
@media (max-width: 768px) {
    .main-container {
        flex-direction: column;
    }
    .file-panel {
        width: 100%;
        height: 40vh;
        border-inline-end: none;
        border-bottom: 1px solid var(--border-color);
    }
    .chat-panel {
        height: 60vh;
    }
}