:root {
    /* Colors - Brand & Interface */
    --primary-color: #296ec6;
    --primary-hover: #15d4b6;
    --secondary-bg: #e9ecef; /* Used in agent message, inputs */
    --accent-success: #28a745;
    --accent-danger: #c62828;
    --accent-danger-bg: #ffebee;
    
    /* Colors - Neutrals & Text */
    --white: #ffffff;
    --bg-body: #f5f5f5;
    --bg-light: #f9f9f9;  /* Chat area, files area */
    --text-main: #333333;
    --text-muted: #666666;
    --text-light: rgba(255, 255, 255, 0.7); /* Sidebar muted text */
    --border-color: #ddd;
    --border-light: rgba(255, 255, 255, 0.1); /* Sidebar borders */
    
    /* Spacing & Sizing */
    --sidebar-width: 280px;
    --padding-std: 20px;
    --padding-sm: 15px;
    --padding-xs: 10px;
    
    /* Borders & Radius */
    --radius-lg: 20px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --radius-round: 25px; /* Buttons, inputs */
    
    /* Effects */
    --shadow-soft: 0 0 10px rgba(0, 0, 0, 0.1);
    --transition-std: all 0.2s ease;
}

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

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: var(--bg-body);
    color: var(--text-main);
}

/* Login styles */
.login-container {
    max-width: 400px;
    margin: 100px auto;
    padding: var(--padding-std);
    background-color: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
}

.form-group {
    margin-bottom: var(--padding-sm);
}

.form-group label {
    display: block;
    margin-bottom: 5px;
}

.form-group input {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

/* Chat interface styles */
.chat-container {
    display: flex;
    height: 100vh;
    background-color: var(--white);
}

/* Chat Sidebar - Similar to Settings */
.chat-sidebar {
    width: var(--sidebar-width);
    background-color: var(--primary-color);
    padding: var(--padding-std);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.chat-user-profile {
    display: flex;
    align-items: center;
    padding: var(--padding-sm);
    margin-bottom: 25px;
    background: var(--border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background 0.2s ease;
}

.chat-user-profile:hover {
    background: rgba(255, 255, 255, 0.15);
}

.chat-user-profile .user-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--white), #e3f2fd);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--padding-sm);
}

.chat-user-profile .user-avatar span {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 18px;
    text-transform: uppercase;
}

.chat-user-profile .user-name {
    color: var(--white);
    font-weight: 600;
    font-size: 16px;
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-user-profile .user-role {
    color: rgba(255, 255, 255, 0.8);
    font-size: 13px;
}

.sessions-section {
    flex-grow: 1;
    margin-bottom: var(--padding-std);
}

.section-title {
    color: var(--white);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: var(--padding-sm);
    display: flex;
    align-items: center;
    opacity: 0.9;
}

.section-title i {
    margin-right: 8px;
}

.sessions-list {
    max-height: calc(100vh - 400px);
    overflow-y: auto;
    padding-right: 5px;
}

.session-item {
    display: flex;
    align-items: center;
    position: relative;
    padding: 12px 85px 12px 12px;
    margin-bottom: 8px;
    background-color: var(--border-light);
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition-std);
    color: var(--white);
    font-size: 14px;
}

.session-name {
    flex-grow: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-right: 0;
    transition: opacity 0.3s ease;
}

.session-name-input {
    flex-grow: 1;
    padding: 4px 6px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 4px;
    background-color: rgba(255, 255, 255, 0.2);
    color: var(--white);
    font-size: 14px;
    margin-right: 5px;
    transition: opacity 0.3s ease;
}

.session-name-input:focus {
    outline: none;
    background-color: rgba(255, 255, 255, 0.3);
    border-color: var(--text-light);
}

.save-session-icon.hidden,
.cancel-session-icon.hidden,
.edit-session-icon.hidden,
.delete-session-btn.hidden {
    display: none !important;
}

.edit-session-icon {
    position: absolute;
    right: 35px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
    cursor: pointer;
    padding: 4px;
    font-size: 14px;
    transition: color 0.2s ease;
    z-index: 2;
}

.edit-session-icon:hover {
    color: var(--white);
}

.session-item:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.session-item.active {
    background-color: rgba(255, 255, 255, 0.65);
    font-weight: 500;
}

.delete-session-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    flex-shrink: 0;
    padding: 4px;
    background: transparent;
    color: var(--text-light);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    transition: var(--transition-std);
    z-index: 2;
}

.delete-session-btn:hover {
    background: rgba(220, 53, 69, 0.3);
    color: #ff6b6b;
    transform: translateY(-50%);
}

.cancel-session-icon {
    position: absolute;
    right: 35px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
    cursor: pointer;
    padding: 4px;
    font-size: 14px;
    transition: color 0.2s ease;
    z-index: 2;
}
.cancel-session-icon:hover {
    color: var(--white);
}

.save-session-icon {
    position: absolute;
    right: 60px;
    top: 50%;
    transform: translateY(-50%);
    color: rgba(40, 167, 69, 0.8);
    cursor: pointer;
    padding: 4px;
    font-size: 16px;
    transition: color 0.2s ease;
    z-index: 2;
}
.save-session-icon:hover {
    color: var(--accent-success);
}

.chat-nav {
    display: flex;
    flex-direction: column;
    gap: var(--padding-xs);
    margin-bottom: var(--padding-std);
}

.nav-link {
    display: flex;
    align-items: center;
    padding: var(--padding-sm);
    background: var(--border-light);
    color: var(--white);
    text-decoration: none;
    border-radius: 10px;
    transition: background 0.2s ease;
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-family: inherit;
    font-weight: 500;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.2);
}

.new-session-link {
    background: rgba(40, 167, 69, 0.2);
}

.new-session-link:hover {
    background: rgba(40, 167, 69, 0.3);
}

.settings-link:hover {
    background: rgba(108, 117, 125, 0.3);
}

.nav-icon {
    margin-right: 12px;
    font-size: 16px;
}

.sidebar-footer {
    display: flex;
    justify-content: space-between;
    gap: var(--padding-xs);
    padding-top: var(--padding-sm);
    border-top: 1px solid var(--border-light);
}

.footer-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--padding-xs);
    color: var(--text-light);
    text-decoration: none;
    font-size: 12px;
    transition: color 0.2s ease;
    flex: 1;
    text-align: center;
}

.footer-link:hover {
    color: var(--white);
}

.footer-link i {
    font-size: 16px;
    margin-bottom: 4px;
}

/* Main Content */
.main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    padding: var(--padding-std);
    position: relative;
    width: calc(100vw - var(--sidebar-width));
}

.top-loading-bar {
    position: absolute;
    top: 0;
    left: 0;
    width: 0%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color) 0%, #00c6ff 100%);
    transition: width 0.4s cubic-bezier(.4,0,.2,1);
    z-index: 1001;
    border-radius: 0 2px 2px 0;
}

.chat-area {
    flex-grow: 1;
    overflow-y: auto;
    padding: var(--padding-std);
    background-color: var(--bg-light);
    margin-bottom: var(--padding-std);
    border-radius: var(--radius-lg);
    position: relative;
    height: calc(100vh - 150px);
}

.files-area {
    height: 150px;
    overflow-y: auto;
    padding: 12px;
    background-color: var(--bg-light);
    margin-bottom: var(--padding-std);
    border-radius: var(--radius-lg);
}

.input-area {
    display: flex;
    gap: var(--padding-xs);
}

.input-area input {
    flex-grow: 1;
    padding: 12px 16px;
    border: 2px solid var(--secondary-bg);
    border-radius: var(--radius-round);
    font-size: 14px;
    transition: border-color 0.2s ease;
}

.input-area input:focus {
    outline: none;
    border-color: var(--primary-color);
}

button {
    padding: 12px 20px;
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: var(--radius-round);
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition-std);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

button:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.error-message {
    background-color: var(--accent-danger-bg);
    color: var(--accent-danger);
    border: 1px solid #ffcdd2;
    padding: var(--padding-xs);
    margin: 5px;
    border-radius: var(--radius-lg);
    position: relative;
}

.message {
    margin: var(--padding-xs);
    padding: 12px 12px 12px 25px;
    border-radius: var(--radius-lg);
    max-width: 80%;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.message strong {
    font-weight: bold;
}

.message .agent {
    color: #0057b5;
}

.user-message {
    background-color: var(--primary-color);
    color: var(--white);
    align-self: flex-end;
    margin-left: auto;
    margin-right: var(--padding-xs);
}

.agent-message {
    background-color: var(--secondary-bg);
    color: black;
    align-self: flex-start;
    margin-right: auto;
    margin-left: var(--padding-xs);
    line-height: 1.5;
}

.file-link {
    display: block;
    padding: 5px;
    color: var(--primary-color);
    text-decoration: none;
}

.file-link:hover {
    text-decoration: underline;
}

.loading-indicator {
    position: sticky;
    bottom: 5px;
    left: 50%;
    transform: translateX(-50%);
    padding: 20px 20px 5px 20px;
    z-index: 1000;
    margin: 10px auto;
    width: fit-content;
}

.hidden {
    display: none !important;
}

.typing-indicator {
    display: flex;
    gap: 5px;
    justify-content: center;
    align-items: center;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: darkblue;
    border-radius: 50%;
    animation: bounce 1.3s ease infinite;
    display: inline-block;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.15s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.3s;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.download-link {
    display: inline-block;
    padding: 2px 15px;
    margin: 5px;
    background-color: var(--primary-color);
    color: var(--white);
    text-decoration: none;
    border-radius: var(--radius-lg);
    font-weight: bold;
    transition: background-color 0.2s ease;
}

.download-link:hover {
    background-color: var(--primary-hover);
    color: var(--white);
}

#messageInput.disabled, 
#sendBtn.disabled {
    background-color: #e0e0e0;
    cursor: not-allowed;
}

.remove-error-btn {
    position: absolute;
    top: 8px;
    right: 12px;
    background: transparent;
    color: var(--accent-danger);
    border: none;
    font-size: 18px;
    cursor: pointer;
    padding: 0 6px;
    line-height: 1;
    border-radius: 50%;
    transition: background 0.2s;
}

.remove-error-btn:hover {
    background: #ffcdd2;
}

/* Settings Page - Layout similar to chat */
.settings-container {
    display: flex;
    height: 100vh;
    background-color: var(--white);
}

.settings-sidebar {
    width: var(--sidebar-width);
    background-color: var(--primary-color);
    padding: var(--padding-std);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.settings-user-profile {
    display: flex;
    align-items: center;
    padding: var(--padding-sm);
    margin-bottom: 30px;
    background: var(--border-light);
    border-radius: var(--radius-md);
}

.settings-user-profile .user-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--white), #e3f2fd);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--padding-sm);
}

.settings-user-profile .user-avatar span {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 18px;
    text-transform: uppercase;
}

.settings-user-profile .user-name {
    color: var(--white);
    font-weight: 600;
    font-size: 16px;
    margin-bottom: 2px;
}

.settings-user-profile .user-role {
    color: rgba(255, 255, 255, 0.8);
    font-size: 13px;
}

.settings-nav {
    display: flex;
    flex-direction: column;
    gap: var(--padding-xs);
}

.logout-link:hover {
    background: rgba(220, 53, 69, 0.3);
}

.settings-main {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    padding: 0;
    background: #f8f9fa;
}

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

.settings-header h1 {
    margin: 0 0 8px 0;
    color: var(--text-main);
    font-size: 2rem;
}

.settings-subtitle {
    color: var(--text-muted);
    margin: 0;
    font-size: 14px;
}

.settings-content {
    flex-grow: 1;
    padding: 30px;
    overflow-y: auto;
}

.settings-section {
    background: var(--white);
    margin-bottom: 30px;
    padding: 25px;
    border-radius: var(--radius-md);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.section-header {
    margin-bottom: 25px;
    padding-bottom: var(--padding-sm);
    border-bottom: 2px solid #f1f3f4;
}

.section-header h2 {
    color: var(--text-main);
    margin: 0 0 8px 0;
    font-size: 1.4em;
    display: flex;
    align-items: center;
}

.section-description {
    color: var(--text-muted);
    margin: 0;
    font-size: 14px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--padding-std);
    margin-bottom: var(--padding-std);
}

.form-group {
    margin-bottom: var(--padding-std);
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-main);
    font-size: 14px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--secondary-bg);
    border-radius: var(--radius-sm);
    font-size: 14px;
    box-sizing: border-box;
    transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
    font-family: inherit;
}

.form-group small {
    display: block;
    margin-top: 6px;
    color: var(--text-muted);
    font-size: 12px;
    font-style: italic;
}

.form-actions {
    text-align: center;
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid var(--secondary-bg);
}

.save-btn {
    display: inline-flex;
    align-items: center;
    padding: 14px 32px;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: var(--radius-round);
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: var(--transition-std);
    box-shadow: 0 4px 12px rgba(0, 123, 255, 0.3);
}

.save-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 123, 255, 0.4);
}

.save-btn:disabled {
    background: #6c757d;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-icon {
    margin-right: 8px;
}

.message-toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 16px 24px;
    border-radius: var(--radius-sm);
    color: var(--white);
    font-weight: 500;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.message-toast.success {
    background: var(--accent-success);
}

.message-toast.error {
    background: #dc3545;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--radius-sm);
    max-width: 500px;
    width: 90%;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.modal-content h3 {
    margin: 0 0 1rem 0;
    color: #e74c3c;
}

.modal-content p {
    margin: 0.5rem 0;
    line-height: 1.5;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 1.5rem;
}

.btn-primary, .btn-secondary {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
}

.btn-primary {
    background-color: #3498db;
    color: var(--white);
}

.btn-primary:hover {
    background-color: #2980b9;
}

.btn-secondary {
    background-color: #95a5a6;
    color: var(--white);
}

.btn-secondary:hover {
    background-color: #7f8c8d;
}

.sessions-header {
    display: flex;
    align-items: center;
    margin-bottom: var(--padding-sm); 
}

.sessions-header .section-title {
    margin-bottom: 0; 
    flex-grow: 1;
    transition: opacity 0.3s ease, width 0.3s ease, margin-right 0.3s ease; 
    white-space: nowrap; 
    overflow: hidden;
}

.sessions-header .section-title.hidden {
    opacity: 0;
    width: 0;
    margin-right: 0;
    padding: 0;
}

.sessions-header .bi-search {
    color: rgba(255, 255, 255, 0.8);
    cursor: pointer;
    font-size: 16px;
    margin-left: var(--padding-xs);
    transition: color 0.2s ease;
    flex-shrink: 0;
}

.sessions-header .bi-search:hover {
    color: var(--white);
}

.search-input {
    flex-grow: 1;
    padding: 6px 10px;
    border: none;
    border-radius: 6px;
    background-color: rgba(255, 255, 255, 0.2);
    color: var(--white);
    font-size: 14px;
    transition: opacity 0.3s ease, width 0.3s ease, padding 0.3s ease;
    width: auto;
    min-width: 0;
    margin-left: var(--padding-xs);
}

.search-input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.search-input:focus {
    outline: none;
    background-color: rgba(255, 255, 255, 0.3);
}

.search-input.hidden {
    opacity: 0;
    width: 0;
    padding: 6px 0;
    border: none;
}

.message pre {
    background-color: #f0f0f0;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px;
    overflow-x: auto;
    margin: var(--padding-xs) 0;
    color: var(--text-main);
}

.message code {
    font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
    font-size: 0.9em;
    background-color: #f0f0f0;
    padding: 2px 4px;
    border-radius: 4px;
}

.message pre code {background-color: transparent;
    padding: 0;
    display: block;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.message h1,
.message h2,
.message h3,
.message h4,
.message h5,
.message h6 {
    margin-top: 1.2em;
    margin-bottom: 0.6em;
    font-weight: 600;
    line-height: 1.3;
}

.message h1 { font-size: 1.8em; border-bottom: 1px solid var(--border-color); padding-bottom: 0.3em;}
.message h2 { font-size: 1.5em; border-bottom: 1px solid #eee; padding-bottom: 0.2em;}
.message h3 { font-size: 1.25em; }
.message h4 { font-size: 1.0em; }
.message h5 { font-size: 0.9em; }
.message h6 { font-size: 0.8em; color: #555; }

@media (max-width: 768px) {
    .chat-sidebar,
    .settings-sidebar {
        width: 100%;
        height: auto;
        padding: var(--padding-sm);
    }
    
    .chat-container,
    .settings-container {
        flex-direction: column;
    }
    
    .sessions-list {
        max-height: 200px;
    }
    
    .chat-nav,
    .settings-nav {
        flex-direction: row;
        overflow-x: auto;
    }
    
    .sidebar-footer {
        flex-direction: row;
        gap: 5px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: var(--padding-sm);
    }
    
    .settings-main {
        height: calc(100vh - 140px);
    }
}

@media (max-width: 480px) {
    .chat-user-profile .user-name,
    .settings-user-profile .user-name {
        max-width: 120px;
    }
    
    .footer-link {
        font-size: 11px;
    }
}

.modal-content h3 {
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.modal-content p {
    margin-bottom: 1.5rem;
    color: var(--text-muted);
    font-size: 14px;
}

.modal-content .form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--secondary-bg);
    border-radius: var(--radius-sm);
    font-size: 14px;
    box-sizing: border-box;
    transition: border-color 0.2s ease;
}

.modal-content .form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}