/**
 * Formula Editor Styles
 * Academy Phase 1 - Batch 1.4: Формулы и расчеты для Operations Manager
 * 
 * Стили следуют стандартам design_standart.md
 */

/* ========== Container ========== */
.formula-editor-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    width: 100%;
    background: var(--background);
    color: var(--text-primary);
    font-family: var(--font-family);
}

/* ========== Header ========== */
.formula-editor-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: clamp(var(--spacing-md), 3vw, var(--spacing-xl));
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

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

.page-title {
    font-size: clamp(1.25rem, 4vw, 1.75rem);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.page-title i {
    color: var(--accent);
    font-size: 1.2em;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* ========== Layout ========== */
.formula-editor-sidebar,
.formula-editor-main {
    display: flex;
    flex-direction: column;
}

/* Mobile: вертикальная компоновка */
.formula-editor-sidebar {
    width: 100%;
    max-height: 300px;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
}

.formula-editor-main {
    flex: 1;
    overflow: hidden;
}

/* Tablet: горизонтальная компоновка */
@media (min-width: 768px) {
    .formula-editor-container {
        flex-direction: row;
    }
    
    .formula-editor-sidebar {
        width: clamp(250px, 30vw, 320px);
        max-height: none;
        border-bottom: none;
        border-right: 1px solid var(--border);
    }
    
    .formula-editor-main {
        flex: 1;
        min-width: 0;
    }
}

/* ========== Sidebar ========== */
.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border);
}

.sidebar-header h3 {
    font-size: clamp(1rem, 2.5vw, 1.125rem);
    font-weight: 600;
    margin: 0;
    color: var(--text-primary);
}

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

.formula-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.formula-list-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    border-radius: var(--border-radius);
    background: var(--surface);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all var(--transition);
    animation: fadeInUp 0.3s ease-out;
    animation-fill-mode: both;
}

.formula-list-item:nth-child(1) { animation-delay: 0.05s; }
.formula-list-item:nth-child(2) { animation-delay: 0.1s; }
.formula-list-item:nth-child(3) { animation-delay: 0.15s; }
.formula-list-item:nth-child(4) { animation-delay: 0.2s; }
.formula-list-item:nth-child(5) { animation-delay: 0.25s; }

.formula-list-item:hover {
    background: var(--surface-hover);
    border-color: var(--accent);
    transform: translateX(4px);
    box-shadow: 0 2px 8px var(--shadow);
}

.formula-list-item.active {
    background: var(--accent-alpha);
    border-color: var(--accent);
    color: var(--accent);
}

.formula-item-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
    min-width: 0;
}

.formula-item-content i {
    color: var(--accent);
    font-size: 1.1em;
    flex-shrink: 0;
}

.formula-item-info {
    flex: 1;
    min-width: 0;
}

.formula-item-name {
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    word-wrap: break-word;
    overflow-wrap: break-word;
    max-width: 100%;
}

@media (max-width: 768px) {
    .formula-item-name {
        white-space: normal;
        word-wrap: break-word;
        overflow-wrap: break-word;
        word-break: break-word;
    }
    
    .formula-list-item {
        max-width: 100%;
        overflow-x: hidden;
        word-wrap: break-word;
    }
    
    .formula-item-content {
        word-wrap: break-word;
        overflow-wrap: break-word;
    }
}

.formula-item-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 2px;
    font-family: 'Courier New', monospace;
}

.formula-item-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-shrink: 0;
}

/* ========== Main Content ========== */
.formula-editor-content {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: var(--spacing-lg);
    overflow-y: auto;
    gap: var(--spacing-lg);
}

.editor-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: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-control {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-sm);
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-family: var(--font-family);
    transition: all var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--input-focus-shadow);
}

.form-control::placeholder {
    color: var(--input-placeholder);
}

.formula-input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.formula-input {
    font-family: 'Courier New', monospace;
    flex: 1;
}

.formula-help {
    color: var(--text-secondary);
    font-size: 0.75rem;
    margin-top: var(--spacing-xs);
}

.formula-test-result {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid;
}

.formula-test-result.success {
    background: rgba(46, 204, 113, 0.1);
    border-color: var(--success);
    color: var(--success);
}

.formula-test-result.error {
    background: rgba(231, 76, 60, 0.1);
    border-color: var(--error);
    color: var(--error);
}

.test-result-content {
    flex: 1;
}

.test-result-label {
    font-size: 0.75rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.test-result-value {
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
}

.formula-functions {
    margin-top: var(--spacing-md);
}

.formula-functions h4 {
    font-size: clamp(0.875rem, 2vw, 1rem);
    font-weight: 600;
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--text-primary);
}

.functions-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

@media (min-width: 768px) {
    .functions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .functions-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.function-category {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
}

.function-category h5 {
    font-size: 0.875rem;
    font-weight: 600;
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--text-primary);
}

.function-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.function-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-sm);
    background: var(--surface);
    color: var(--text-primary);
    font-size: 0.75rem;
    font-family: 'Courier New', monospace;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    touch-action: manipulation;
    min-height: 32px;
}

.function-btn:hover {
    background: var(--surface-hover);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 2px 8px var(--shadow);
}

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

.formula-columns {
    margin-top: var(--spacing-md);
}

.formula-columns h4 {
    font-size: clamp(0.875rem, 2vw, 1rem);
    font-weight: 600;
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--text-primary);
}

.columns-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.column-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-sm);
    background: var(--surface);
    color: var(--text-primary);
    font-size: 0.75rem;
    font-family: 'Courier New', monospace;
    cursor: pointer;
    transition: all var(--transition);
    touch-action: manipulation;
    min-height: 32px;
}

.column-btn:hover {
    background: var(--surface-hover);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 2px 8px var(--shadow);
}

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

.editor-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border);
}

/* ========== Data Source Panel ========== */
.data-source-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    justify-content: space-between;
}

.data-source-panel {
    margin-top: var(--spacing-sm);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    animation: slideDown 0.2s ease-out;
    max-height: 500px;
    display: flex;
    flex-direction: column;
}

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

.panel-tabs {
    display: flex;
    gap: var(--spacing-xs);
    border-bottom: 1px solid var(--border);
    margin-bottom: var(--spacing-md);
}

.panel-tabs .tab-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.875rem;
}

.panel-tabs .tab-btn:hover {
    color: var(--text-primary);
    background: var(--surface-hover);
}

.panel-tabs .tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.panel-content {
    flex: 1;
    overflow-y: auto;
    min-height: 200px;
    max-height: 300px;
}

.panel-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border);
}

.data-source-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.data-source-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s ease;
}

.data-source-item:hover {
    background: var(--surface-hover);
    border-color: var(--primary);
}

.data-source-item.active {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
}

.source-item-info {
    flex: 1;
}

.source-item-name {
    font-weight: 500;
    color: var(--text-primary);
}

.source-item-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.data-source-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--surface-alt);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
}

.data-source-info i {
    color: var(--accent);
}

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    background: var(--surface);
    color: var(--text-primary);
    font-size: clamp(0.75rem, 1.5vw, 0.875rem);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    touch-action: manipulation;
    min-height: 44px;
    will-change: transform, box-shadow;
}

.btn:hover {
    background: var(--surface-hover);
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px var(--shadow);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
    color: var(--text-inverse);
    border-color: var(--accent);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--accent-hover) 0%, var(--accent-active) 100%);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border-color: var(--border);
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition);
    touch-action: manipulation;
    min-width: 44px;
    min-height: 44px;
}

.btn-icon:hover {
    background: var(--surface-hover);
    color: var(--accent);
}

.btn-icon:active {
    transform: scale(0.95);
}

@media (min-width: 768px) {
    .btn {
        min-height: 36px;
    }
    
    .btn-icon {
        min-width: 32px;
        min-height: 32px;
    }
}

/* ========== Empty States ========== */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    min-height: 300px;
}

.empty-state-icon {
    font-size: 4rem;
    color: var(--text-disabled);
    opacity: 0.5;
    animation: float 3s ease-in-out infinite;
}

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

.empty-state-title {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.empty-state-text {
    color: var(--text-secondary);
    max-width: 400px;
    margin: 0;
}

.empty-state-description {
    color: var(--text-secondary);
    max-width: 400px;
    margin: 0;
}

.empty-state-action {
    margin-top: var(--spacing-md);
}

.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--error);
}

.error-state i {
    font-size: 3rem;
    opacity: 0.5;
}

/* ========== Loading ========== */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xl);
    color: var(--text-secondary);
}

.loading i {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ========== Modals ========== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    animation: fadeIn 0.2s ease-out;
}

.modal-content {
    background: var(--surface);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 8px 32px var(--shadow-lg);
    width: min(90vw, 600px);
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    animation: slideUp 0.3s ease-out;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    font-weight: 600;
    margin: 0;
    color: var(--text-primary);
}

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

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border);
}

.data-source-tabs {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border);
}

.tab-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all var(--transition);
    touch-action: manipulation;
    min-height: 44px;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: var(--surface-hover);
}

.tab-btn.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.data-source-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-height: 400px;
    overflow-y: auto;
}

.data-source-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    background: var(--surface);
    cursor: pointer;
    transition: all var(--transition);
    touch-action: manipulation;
    min-height: 44px;
}

.data-source-item:hover {
    background: var(--surface-hover);
    border-color: var(--accent);
    transform: translateX(4px);
}

.data-source-item.active {
    background: var(--accent-alpha);
    border-color: var(--accent);
}

.data-source-item i {
    color: var(--accent);
    font-size: 1.2em;
    flex-shrink: 0;
}

.source-item-info {
    flex: 1;
    min-width: 0;
}

.source-item-name {
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.source-item-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* ========== Skeleton Screens ========== */
.skeleton-container {
    padding: var(--spacing-lg);
}

.skeleton {
    background: linear-gradient(
        90deg,
        var(--surface) 0%,
        var(--surface-hover) 50%,
        var(--surface) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: 4px;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton-text {
    height: 1em;
    margin-bottom: 0.5em;
}

.skeleton-text:last-child {
    width: 60%;
}

/* ========== Animations ========== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========== Mobile Optimizations ========== */
@media (max-width: 768px) {
    /* Вертикальная компоновка на мобильных */
    .formula-editor-container {
        flex-direction: column;
    }

    .formula-editor-sidebar {
        width: 100%;
        max-height: 300px;
        border-bottom: 1px solid var(--border);
        border-right: none;
    }

    .formula-editor-main {
        flex: 1;
        min-width: 0;
    }

    /* Компактный header */
    .formula-editor-header {
        padding: var(--mobile-spacing-md);
        flex-wrap: wrap;
        gap: var(--mobile-spacing-sm);
    }

    .header-actions {
        gap: var(--mobile-spacing-xs);
        flex-wrap: wrap;
    }

    .header-actions .btn {
        min-height: var(--touch-target-min);
        padding: var(--mobile-spacing-sm) var(--mobile-spacing-md);
        font-size: var(--mobile-font-size-sm);
    }

    /* Вертикальная компоновка редактора */
    .formula-editor-content {
        padding: var(--mobile-spacing-md);
        gap: var(--mobile-spacing-lg);
    }

    .editor-form {
        gap: var(--mobile-spacing-md);
    }

    .form-group {
        gap: var(--mobile-spacing-sm);
    }

    .form-group label {
        font-size: var(--mobile-font-size-sm);
    }

    .form-control {
        padding: var(--mobile-spacing-md);
        font-size: var(--mobile-font-size-base);
        min-height: var(--touch-target-min);
    }

    /* Адаптивный input для формул */
    .formula-input-wrapper {
        gap: var(--mobile-spacing-xs);
    }

    .formula-input {
        font-size: var(--mobile-font-size-base);
        min-height: var(--touch-target-min);
    }

    .formula-input-wrapper .btn-icon {
        min-width: var(--touch-target-min);
        min-height: var(--touch-target-min);
        flex-shrink: 0;
    }

    /* Кнопка открытия мобильной клавиатуры */
    .formula-keyboard-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        min-height: var(--touch-target-min);
        padding: var(--mobile-spacing-md);
        margin-top: var(--mobile-spacing-sm);
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: 8px;
        color: var(--text-primary);
        font-size: var(--mobile-font-size-sm);
        cursor: pointer;
        touch-action: manipulation;
        transition: all 0.2s ease;
    }

    .formula-keyboard-toggle:active {
        background: var(--surface-hover);
        transform: scale(0.98);
    }

    .formula-keyboard-toggle i {
        margin-right: var(--mobile-spacing-sm);
    }

    /* Мобильная клавиатура для формул (bottom sheet) */
    .formula-mobile-keyboard {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: var(--surface);
        border-radius: 20px 20px 0 0;
        max-height: 70vh;
        overflow-y: auto;
        z-index: var(--z-modal);
        box-shadow: 0 -4px 12px var(--shadow-lg);
        transform: translateY(100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        padding: var(--mobile-spacing-md);
        padding-bottom: calc(var(--mobile-spacing-md) + env(safe-area-inset-bottom));
    }

    .formula-mobile-keyboard.open {
        transform: translateY(0);
    }

    .formula-keyboard-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        margin-bottom: var(--mobile-spacing-md);
        padding-bottom: var(--mobile-spacing-sm);
        border-bottom: 1px solid var(--border);
    }

    .formula-keyboard-title {
        font-size: var(--mobile-font-size-lg);
        font-weight: 600;
        color: var(--text-primary);
    }

    .formula-keyboard-close {
        min-height: var(--touch-target-min);
        min-width: var(--touch-target-min);
        display: flex;
        align-items: center;
        justify-content: center;
        background: transparent;
        border: none;
        color: var(--text-secondary);
        cursor: pointer;
        touch-action: manipulation;
        border-radius: 8px;
        transition: background 0.2s ease;
    }

    .formula-keyboard-close:active {
        background: var(--surface-hover);
    }

    .formula-keyboard-tabs {
        display: flex;
        gap: var(--mobile-spacing-xs);
        margin-bottom: var(--mobile-spacing-md);
        border-bottom: 1px solid var(--border);
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .formula-keyboard-tab {
        padding: var(--mobile-spacing-sm) var(--mobile-spacing-md);
        min-height: var(--touch-target-min);
        background: transparent;
        border: none;
        border-bottom: 2px solid transparent;
        color: var(--text-secondary);
        font-size: var(--mobile-font-size-sm);
        font-weight: 500;
        cursor: pointer;
        touch-action: manipulation;
        white-space: nowrap;
        transition: all 0.2s ease;
    }

    .formula-keyboard-tab.active {
        color: var(--accent);
        border-bottom-color: var(--accent);
    }

    .formula-keyboard-content {
        display: none;
    }

    .formula-keyboard-content.active {
        display: block;
    }

    .formula-keyboard-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: var(--mobile-spacing-xs);
    }

    .formula-keyboard-btn {
        min-height: var(--touch-target-min);
        padding: var(--mobile-spacing-sm);
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: 8px;
        color: var(--text-primary);
        font-size: var(--mobile-font-size-sm);
        font-family: 'Courier New', monospace;
        font-weight: 600;
        cursor: pointer;
        touch-action: manipulation;
        transition: all 0.2s ease;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .formula-keyboard-btn:active {
        background: var(--accent);
        color: white;
        transform: scale(0.95);
    }

    .formula-keyboard-btn.operator {
        background: var(--surface-hover);
        font-size: var(--mobile-font-size-base);
    }

    .formula-keyboard-btn.function {
        background: var(--accent-alpha);
        color: var(--accent);
    }

    /* Функции и колонки на мобильных */
    .formula-functions {
        margin-top: var(--mobile-spacing-md);
    }

    .formula-functions h4 {
        font-size: var(--mobile-font-size-base);
        margin-bottom: var(--mobile-spacing-sm);
    }

    .functions-grid {
        grid-template-columns: 1fr;
        gap: var(--mobile-spacing-md);
    }

    .function-category {
        padding: var(--mobile-spacing-md);
    }

    .function-category h5 {
        font-size: var(--mobile-font-size-sm);
        margin-bottom: var(--mobile-spacing-sm);
    }

    .function-buttons {
        gap: var(--mobile-spacing-xs);
    }

    .function-btn {
        min-height: var(--touch-target-min);
        padding: var(--mobile-spacing-sm) var(--mobile-spacing-md);
        font-size: var(--mobile-font-size-sm);
    }

    .formula-columns {
        margin-top: var(--mobile-spacing-md);
    }

    .formula-columns h4 {
        font-size: var(--mobile-font-size-base);
        margin-bottom: var(--mobile-spacing-sm);
    }

    .columns-list {
        gap: var(--mobile-spacing-xs);
    }

    .column-btn {
        min-height: var(--touch-target-min);
        padding: var(--mobile-spacing-sm) var(--mobile-spacing-md);
        font-size: var(--mobile-font-size-sm);
    }

    /* Результат теста */
    .formula-test-result {
        padding: var(--mobile-spacing-md);
        margin-top: var(--mobile-spacing-md);
    }

    /* Actions */
    .editor-actions {
        flex-direction: column;
        gap: var(--mobile-spacing-sm);
        padding-top: var(--mobile-spacing-md);
    }

    .editor-actions .btn {
        width: 100%;
        min-height: var(--touch-target-min);
        padding: var(--mobile-spacing-md);
        font-size: var(--mobile-font-size-base);
    }

    /* Touch-friendly элементы в sidebar */
    .formula-list-item {
        padding: var(--mobile-spacing-md);
        min-height: var(--touch-target-min);
        margin-bottom: var(--mobile-spacing-sm);
    }

    .formula-item-actions .btn-icon {
        min-width: var(--touch-target-min);
        min-height: var(--touch-target-min);
    }
}

/* Overlay для мобильной клавиатуры */
.formula-keyboard-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: calc(var(--z-modal) - 1);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.formula-keyboard-overlay.active {
    opacity: 1;
    pointer-events: all;
}

@media (min-width: 769px) {
    .formula-keyboard-toggle,
    .formula-mobile-keyboard,
    .formula-keyboard-overlay {
        display: none;
    }
}

@media (max-width: 480px) {
    .formula-editor-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .header-actions {
        width: 100%;
        justify-content: stretch;
    }
    
    .header-actions .btn {
        flex: 1;
    }

    .formula-keyboard-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ========== Accessibility ========== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

.btn:focus-visible,
.btn-icon:focus-visible,
.form-control:focus-visible,
.tab-btn:focus-visible,
.function-btn:focus-visible,
.column-btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}