/* ========================================
   CSS Variables & Design System
   ======================================== */
:root {
    /* Colors */
    --primary: rgb(29, 48, 105);
    --primary-light: rgba(29, 48, 105, 0.1);
    --primary-dark: rgb(20, 35, 75);
    --neutral: #6B7280;
    --neutral-light: #9CA3AF;
    --neutral-dark: #374151;
    --accent: #17A2B8;
    --accent-hover: #138496;
    --success: #0F9D58;
    --success-hover: #0d8549;
    --error: #DC3545;
    --warning: #FFC107;

    /* Backgrounds */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --bg-dark: #1F2937;
    --bg-overlay: rgba(0, 0, 0, 0.5);

    /* Text */
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --text-inverse: #FFFFFF;

    /* Borders */
    --border-color: #E5E7EB;
    --border-radius: 8px;
    --border-radius-sm: 6px;
    --border-radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;

    /* Transitions */
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
}

/* ========================================
   Reset & Base Styles
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background: var(--bg-secondary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ========================================
   Utility Classes
   ======================================== */
.hidden {
    display: none !important;
}

.btn-block {
    width: 100%;
}

/* ========================================
   Login Modal
   ======================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-md);
}

.modal-container {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    max-width: 450px;
    width: 100%;
    overflow: hidden;
    animation: modalSlideIn 0.4s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-light) 0%, transparent 100%);
}

.modal-logo {
    width: 150px;
    height: auto;
    margin-bottom: var(--spacing-md);
}

.modal-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-xs);
}

.modal-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.modal-body {
    padding: var(--spacing-lg);
}

/* Tabs */
.tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--border-color);
}

.tab-button {
    flex: 1;
    padding: var(--spacing-md);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: -2px;
}

.tab-button:hover {
    color: var(--primary);
}

.tab-button.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* Forms */
.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input {
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(23, 162, 184, 0.1);
}

.message {
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-sm);
    display: none;
}

.message.success {
    display: block;
    background: rgba(15, 157, 88, 0.1);
    color: var(--success);
    border: 1px solid var(--success);
}

.message.error {
    display: block;
    background: rgba(220, 53, 69, 0.1);
    color: var(--error);
    border: 1px solid var(--error);
}

/* Buttons */
.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-base);
    font-weight: 500;
    font-family: var(--font-family);
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.btn-primary {
    background: var(--accent);
    color: var(--text-inverse);
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active {
    transform: translateY(0);
}

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

.btn-secondary:hover {
    background: var(--border-color);
}

.btn-icon {
    padding: var(--spacing-sm) 0;;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

/* ========================================
   Main Application
   ======================================== */
.main-app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header */
.app-header {
    background: var(--bg-secondary);
    /* border-bottom: 1px solid var(--border-color); */
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    /* box-shadow: var(--shadow-sm); */
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.header-logo {
    width: 140px;
    height: auto;
    padding: var(--spacing-xs);
}

.header-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary);
}

.header-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-name {
    font-size: var(--font-size-md);
    color: var(--text-secondary);
    font-weight: 500;
}

/* App Container */
.app-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}


/* logout button */
.logout-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

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

/* new chat button */

.new-chat-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    background: transparent;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    width: 100%;
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-md);
}

.new-chat-btn:hover {
    background: var(--bg-tertiary);
}

.new-chat-icon {
    width: 25px;
    height: 25px;
    border-radius: 50%;
    background: var(--primary-dark);
    color: var(--text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 300;
    flex-shrink: 0;
}

/* Sidebar */
.sidebar {
    width: 320px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: var(--transition);
    position: relative;
}

.sidebar-content {
    padding: var(--spacing-lg);
    overflow-y: auto;
    flex: 1;
}

.sidebar-section {
    margin-top: var(--spacing-lg);
}

.sidebar-heading {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-md);
}

.sidebar-collapse-btn {
    display: none !important;
    position: relative;
    align-self: flex-start;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 18px;
    padding: var(--spacing-sm);
    border-radius: 50%;
    transition: var(--transition);
    z-index: 10;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    margin-left: calc(-1 * var(--spacing-sm));
}

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

.sidebar.collapsed {
    width: 0;
    min-width: 0;
    border-right: none;
}

.sidebar.collapsed .sidebar-content {
    display: none;
}

.sidebar-expand-btn {
    display: none !important;
    position: fixed;
    top: calc(86px + var(--spacing-lg));
    left: calc(8px + var(--spacing-md));
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 18px;
    padding: var(--spacing-sm);
    border-radius: 50%;
    transition: var(--transition);
    display: none;
    margin-left: calc(-1 * var(--spacing-sm));
}

.sidebar.collapsed .sidebar-expand-btn {
    display: flex;
}

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

/* Conversations List - Scrollable, No Boxes */
.conversations-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    max-height: 170px;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0;
}

.conversation-item {
    padding: var(--spacing-md) 0;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.conversation-item:hover {
    background: var(--bg-secondary);
    color: var(--accent);
}

.conversation-item.active {
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 500;
    border-left: 3px solid var(--primary);
    padding-left: calc(var(--spacing-md) - 3px);
}

.conversations-empty {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* Settings */
.settings-group {
    margin-bottom: var(--spacing-lg);
}

.settings-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.slider-value {
    color: var(--accent);
    font-weight: 600;
}

/* Checkboxes */
.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    overflow:hidden;
    text-overflow:ellipsis;
    white-space: nowrap;
    flex: 1;
    min-width: 0;
}

.checkbox-label span{
    overflow:hidden;
    text-overflow:ellipsis;
    white-space: nowrap;
    flex: 1;
    min-width: 0;
}

.checkbox-label:hover {
    background: var(--bg-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent);
}


/* Radio Buttons */
.radio-group {
    display: flex;
    flex-direction: row;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.radio-label:hover {
    background: var(--bg-secondary);
}

.radio-label input[type="radio"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent);
}

/* Slider */
.slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    transition: var(--transition);
}

.slider::-webkit-slider-thumb:hover {
    background: var(--accent-hover);
    transform: scale(1.1);
}

.slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

.slider::-moz-range-thumb:hover {
    background: var(--accent-hover);
    transform: scale(1.1);
}

/* Select */
.select {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-sm);
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(23, 162, 184, 0.1);
}

/* File Upload Section */
.file-upload-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    background: transparent;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    width: 100%;
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-md);
    /*border: 1px solid var(--primary-dark);*/
}

.file-upload-btn:hover {
    background: var(--bg-tertiary);
}

.upload-icon {
    width: 25px;
    height: 25px;
    border-radius: var(--border-radius-sm);
    background: var(--primary-dark);
    color: var(--text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    /*margin-left: 1px /*var(--spacing-sm)*/;
    position: relative;
}

.upload-icon::before {
    content: '';
    position: absolute;
    bottom: 6px;
    left: 4px;
    right: 4px;
    height: 4px;
    border: 2px solid white;
    border-top: none;
    border-radius: 0 0 2px 2px;
}

.upload-icon::after {
    content: '';
    position: absolute;
    top: 4px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-bottom: 5px solid white;
}

.upload-icon .arrow-shaft {
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 6px;
    background: white;
}

.upload-progress {
    margin-bottom: 12px;
}

.upload-progress.hidden {
    display: none;
}

.progress-bar {
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 4px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    width: 0%;
    animation: progress 2s ease-in-out infinite;
}

/* Upload Queue Status */
.upload-queue-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 12px;
    color: var(--text-primary);
}
#queueStatus {
    font-weight: 500;
}
#currentFile {
    color: var(--accent);
    font-weight: 600;
}
#totalFiles {
    color: rgba(255, 255, 255, 0.6);
}

/* Stop Upload Button - subtle red danger style */
.stop-upload-btn {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(220, 53, 69, 0.1);
    border: 1px solid var(--error);
    border-radius: var(--border-radius-sm);
    color: var(--error);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    margin-top: var(--spacing-sm);
}

.stop-upload-btn:hover {
    background: rgba(220, 53, 69, 0.2);
}

.stop-upload-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}


@keyframes progress {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}

.progress-text {
    font-size: 11px;
    color: rgba(255, 255, 255, 0.6);
}

.delete-upload-btn {
    background: transparent;
    border: none;
    color: rgba(255, 100, 100, 0.7);
    font-size: 20px;
    cursor: pointer;
    padding: 0 8px;
    margin-left: 8px;
    transition: color 0.2s;
    line-height: 1;
}

.delete-upload-btn:hover {
    color: rgba(255, 100, 100, 1);
}

/*Upload Item Container*/
.upload-item-container {
    display:flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--shadow-xs);
}

.upload-item-container .checkbox-label {
    flex:1;
    margin:0;
}

.upload-item-container .delete-upload-btn {
    background: transparent;
    border: none;
    color: rgba(220, 53, 69, 0.7);
    font-size: 18px;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    line-height: 1;
    flex-shrink: 0;
}

.upload-item-container .delete-upload-btn:hover {
    color: rgba(220, 53, 69, 1);
    background: rgba(220, 53, 69, 0.1);
}

.upload-item-container input[type="checkbox"] {
    width: 18px !important;
    height: 18px !important;
    min-width: 18px;
    min-height: 18px;
    cursor: pointer;
    accent-color: var(--accent);
}

/* Confirmation Dialog */
.delete-confirmation {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: #2a2a2a;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    z-index: 1000;
    min-width: 300px;
}
.delete-confirmation h3 {
    margin: 0 0 12px 0;
    font-size: 16px;
}
.delete-confirmation p {
    margin: 0 0 20px 0;
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
}
.delete-confirmation-buttons {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}
.delete-confirmation-buttons button {
    padding: 8px 16px;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    font-size: 14px;
}
.btn-cancel {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}
.btn-delete {
    background: #ff4444;
    color: white;
}
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
}

/* Toast Notifications */
@keyframes slideIn {
    from { transform: translateX(400px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}
@keyframes slideOut {
    from { transform: translateX(0); opacity: 1; }
    to { transform: translateX(400px); opacity: 0; }
}

/* ========================================
   Chat Area
   ======================================== */
.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
    overflow: hidden;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg) 40%;
    display: flex;
    flex-direction: column;
    gap: var(--shadow-md);
    align-items: stretch;
    width: 100%;
}

.chat-placeholder {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-secondary);
}

.chat-placeholder h2 {
    font-size: var(--font-size-2xl);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.chat-placeholder p {
    font-size: var(--font-size-base);
}

/* Message Bubbles */
.message-wrapper {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    max-width: 90%;
    animation: messageSlideIn 0.3s ease;
}

@keyframes messageSlideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-wrapper.user {
    align-self: flex-end;
    width: 75%;
}

.message-wrapper.assistant {
    align-self: flex-start;
    width: 85%;
}

.message-bubble {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    font-size: var(--font-size-base);
    line-height: 1.6;
    word-wrap: break-word;
    position: relative;
    font-family: 'Source Serif Pro', Georgia, serif;
}

.message-wrapper.user .message-bubble {
    background: var(--accent);
    color: var(--text-inverse);
    border-bottom-right-radius: var(--spacing-xs);
}

.message-wrapper.assistant .message-bubble {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 0px solid var(--border-color);
    border-bottom-left-radius: var(--spacing-xs);
}

/* Markdown Styling in Assistant Messages */
.message-wrapper.assistant .message-bubble h1,
.message-wrapper.assistant .message-bubble h2,
.message-wrapper.assistant .message-bubble h3,
.message-wrapper.assistant .message-bubble h4 {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-weight: 600;
}

.message-wrapper.assistant .message-bubble h1 {
    font-size: var(--font-size-xl);
}

.message-wrapper.assistant .message-bubble h2 {
    font-size: var(--font-size-lg);
}

.message-wrapper.assistant .message-bubble h3 {
    font-size: var(--font-size-base);
}

.message-wrapper.assistant .message-bubble h4 {
    font-size: var(--font-size-sm);
}

.message-wrapper.assistant .message-bubble h1:first-child,
.message-wrapper.assistant .message-bubble h2:first-child,
.message-wrapper.assistant .message-bubble h3:first-child,
.message-wrapper.assistant .message-bubble h4:first-child {
    margin-top: 0;
}

.message-wrapper.assistant .message-bubble ul,
.message-wrapper.assistant .message-bubble ol {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
}

.message-wrapper.assistant .message-bubble li {
    margin: var(--spacing-xs) 0;
}

.message-wrapper.assistant .message-bubble p {
    margin: var(--spacing-sm) 0;
}

.message-wrapper.assistant .message-bubble p:first-child {
    margin-top: 0;
}

.message-wrapper.assistant .message-bubble p:last-child {
    margin-bottom: 0;
}

.message-wrapper.assistant .message-bubble code {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-sm);
}

.message-wrapper.assistant .message-bubble pre {
    background: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    overflow-x: auto;
    margin: var(--spacing-sm) 0;
}

.message-wrapper.assistant .message-bubble pre code {
    background: none;
    padding: 0;
}

.message-wrapper.assistant .message-bubble a {
    color: var(--accent);
    text-decoration: underline;
}

.message-wrapper.assistant .message-bubble a:hover {
    color: var(--accent-hover);
}

.message-wrapper.assistant .message-bubble strong {
    font-weight: 600;
}

.message-wrapper.assistant .message-bubble em {
    font-style: italic;
}

.message-wrapper.assistant .message-bubble blockquote {
    border-left: 3px solid var(--accent);
    padding-left: var(--spacing-md);
    margin: var(--spacing-sm) 0;
    color: var(--text-secondary);
}

/* Message Actions */
.message-actions {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

.message-wrapper.user .message-actions {
    justify-content: flex-end;
}

.message-action-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.message-action-btn:hover {
    background: var(--bg-primary);
    color: var(--text-primary);
    border-color: var(--accent);
}

.message-action-btn.active {
    background: var(--success);
    color: var(--text-inverse);
    border-color: var(--success);
}

.message-action-btn.active.thumbs-down {
    background: var(--error);
    border-color: var(--error);
}

.message-action-btn.active.wrong {
    background: var(--warning);
    border-color: var(--warning);
}

/* Thinking Indicator */
.thinking-indicator {
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--bg-primary);
    max-width: 80%;
    align-self: flex-start;
}

.thinking-dots {
    display: flex;
    gap: 6px;
}

.thinking-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    animation: thinkingBounce 1.4s infinite ease-in-out both;
}

.thinking-dots span:nth-child(1) {
    animation-delay: -0.32s;
}

.thinking-dots span:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes thinkingBounce {

    0%,
    80%,
    100% {
        transform: scale(0);
    }

    40% {
        transform: scale(1);
    }
}

.thinking-text {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-style: italic;
}

/* Input Area */
.input-area {
    background: transparent;
    border-top: none;
    padding: var(--spacing-lg);
    position: relative;
}

.disclaimer-text {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    text-align: center;
    margin-top: var(--spacing-sm);
    padding: 0;
}

.chat-form {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-end;
    justify-content: center;
}

.chat-form textarea {
    /* flex: 1; */
    padding: var(--spacing-md) var(--spacing-lg);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    resize: none;
    min-height: 48px;
    max-height: 120px;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    background: var(--bg-primary);
    width: 65%;
    max-width: 80%;
}

.chat-form textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(23, 162, 184, 0.1);
}

.btn-send {
    padding: var(--spacing-md);
    background: var(--accent);
    border: none;
    border-radius: var(--border-radius-sm);
    color: var(--text-inverse);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 48px;
    height: 48px;
}

.btn-send:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-send:active {
    transform: translateY(0);
}

.btn-send:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ========================================
   Responsive Design - Mobile First
   ======================================== */

/* Mobile (<768px) - Default styles above */
@media (max-width: 767px) {
    /*.btn-icon {
        /*display: flex;
    }*/

    .sidebar {
        position: fixed;
        left: -320px;
        top: 60px;
        bottom: 0;
        z-index: 99;
        box-shadow: var(--shadow-xl);
    }

    .sidebar.open {
        left: 0;
    }

    .header-title {
        font-size: var(--font-size-lg);
    }

    .user-name {
        display: none;
    }

    .chat-messages{
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .message-wrapper {
        max-width: 100%;
    }

    .modal-container {
        margin: var(--spacing-md);
    }

    .chat-form textarea {
        width: 100%;
        max-width: 100%;
    }
}

/* Tablet (768px - 1024px) */
@media (min-width: 768px) and (max-width: 1024px) {
    .sidebar {
        width: 280px;
    }

    .message-wrapper {
        max-width: 85%;
    }
}

/* Desktop (>1024px) - Optimal layout */
@media (min-width: 1025px) {
    .chat-messages {
        padding: var(--spacing-xl) 10%;
    }

    .message-wrapper {
        max-width: 90%;

    }
}

/* ========================================
   Scrollbar Styling
   ======================================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--neutral);
}

/* ========================================
   Print Styles
   ======================================== */
@media print {

    .sidebar,
    .input-area,
    .app-header,
    .message-actions {
        display: none;
    }

    .chat-area {
        width: 100%;
    }
}