/* ============================================
   СОВРЕМЕННЫЙ МИНИМАЛИСТИЧНЫЙ ДИЗАЙН
   Mobile-First подход
   ============================================ */

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

:root {
    --color-bg: #ffffff;
    --color-surface: #ffffff;
    --color-border: #e5e7eb;
    --color-text: #111827;
    --color-text-secondary: #6b7280;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-danger: #dc2626;
    --color-danger-hover: #b91c1c;
    --color-success: #059669;
    --color-warning: #d97706;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --radius: 6px;
    --radius-lg: 8px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: #f9fafb;
    min-height: 100vh;
    color: var(--color-text);
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    padding: 0;
}

.container {
    width: 100%;
    margin: 0 auto;
    background: var(--color-bg);
    min-height: 100vh;
}

/* Навигация */
nav {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

nav > div:first-child {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

nav > div:first-child a {
    color: var(--color-text);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: var(--spacing-sm) 0;
    display: flex;
    align-items: center;
    min-height: 36px;
    transition: color 0.15s;
    -webkit-tap-highlight-color: transparent;
}

nav > div:first-child a:hover,
nav > div:first-child a:active {
    color: var(--color-primary);
}

nav > div:last-child {
    color: var(--color-text-secondary);
    font-size: 13px;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

nav > div:last-child a {
    color: var(--color-danger);
    text-decoration: none;
    margin-left: var(--spacing-sm);
    padding: var(--spacing-xs) 0;
    display: inline-flex;
    align-items: center;
    min-height: 36px;
}

/* Заголовок */
header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-lg) var(--spacing-md);
}

header h1 {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

/* Убираем эмодзи из заголовков */
header h1::before {
    content: none;
}

.stats {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    font-size: 13px;
}

.stat-label {
    color: var(--color-text-secondary);
}

.stat-value {
    font-weight: 600;
    color: var(--color-text);
}

/* Панель управления */
.controls {
    padding: var(--spacing-md);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.search-box {
    position: relative;
    width: 100%;
}

#searchInput {
    width: 100%;
    padding: 10px 36px 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 14px;
    background: var(--color-bg);
    color: var(--color-text);
    transition: border-color 0.15s;
    -webkit-appearance: none;
}

#searchInput:focus {
    outline: none;
    border-color: var(--color-primary);
}

.btn-clear {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    color: var(--color-text-secondary);
    border: none;
    width: 24px;
    height: 24px;
    cursor: pointer;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    transition: background 0.15s, color 0.15s;
    -webkit-tap-highlight-color: transparent;
    min-width: 36px;
    min-height: 36px;
}

.btn-clear:hover,
.btn-clear:active {
    background: #f3f4f6;
    color: var(--color-text);
}

.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
    width: 100%;
}

.btn-action {
    flex: 1;
    padding: 10px var(--spacing-md);
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.15s;
    min-height: 36px;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.btn-action:hover {
    background: #f9fafb;
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-action:active {
    background: #f3f4f6;
    transform: scale(0.98);
}

/* Дерево категорий */
.tree-container {
    padding: var(--spacing-md);
    max-height: calc(100vh - 300px);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.tree {
    list-style: none;
    padding: 0;
}

.tree-node {
    margin: 2px 0;
}

.node-content {
    display: flex;
    align-items: center;
    padding: 8px var(--spacing-sm);
    border-radius: var(--radius);
    cursor: pointer;
    user-select: none;
    min-height: 36px;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    transition: background 0.15s;
}

.node-content:hover {
    background: #f9fafb;
}

.node-content:active {
    background: #f3f4f6;
}

.node-content.highlight {
    background: #fef3c7;
}

.toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    margin-right: var(--spacing-sm);
    font-size: 10px;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: transform 0.15s, color 0.15s;
    user-select: none;
    flex-shrink: 0;
}

.toggle:hover {
    color: var(--color-text);
}

.toggle[data-expanded="true"] {
    transform: rotate(90deg);
}

.toggle-placeholder {
    display: inline-block;
    width: 20px;
    margin-right: var(--spacing-sm);
    flex-shrink: 0;
}

.node-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
    flex-wrap: wrap;
}

.category-id {
    font-weight: 500;
    color: var(--color-text-secondary);
    font-size: 12px;
    font-family: 'Monaco', 'Menlo', monospace;
    flex-shrink: 0;
}

.category-name {
    font-size: 14px;
    color: var(--color-text);
    flex: 1;
    word-break: break-word;
}

.children-count {
    font-size: 12px;
    color: var(--color-text-secondary);
    background: #f3f4f6;
    padding: 2px 6px;
    border-radius: 10px;
    margin-left: var(--spacing-xs);
}

.offers-count {
    font-size: 12px;
    color: var(--color-primary);
    background: #eff6ff;
    padding: 2px 8px;
    border-radius: 10px;
    margin-left: var(--spacing-sm);
    font-weight: 500;
    white-space: nowrap;
    flex-shrink: 0;
}

.offers-count-zero {
    color: var(--color-text-secondary);
    background: #f3f4f6;
}

.tree-children {
    list-style: none;
    padding-left: var(--spacing-lg);
    margin-top: 2px;
    border-left: 1px solid var(--color-border);
    margin-left: 10px;
}

.tree-children .tree-node {
    margin: 1px 0;
}

.tree-children .tree-children {
    padding-left: var(--spacing-md);
}

.tree-node.hidden {
    display: none;
}

.no-results {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-secondary);
    font-size: 14px;
}

/* Страница ошибки */
.error-container {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
}

.error-container h1 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.error-message {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: var(--radius);
    text-align: left;
}

.btn-back {
    display: inline-block;
    padding: 10px var(--spacing-lg);
    background: var(--color-primary);
    color: white;
    text-decoration: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    min-height: 36px;
    transition: background 0.15s;
}

.btn-back:hover,
.btn-back:active {
    background: var(--color-primary-hover);
}

/* Скроллбар */
.tree-container::-webkit-scrollbar {
    width: 6px;
}

.tree-container::-webkit-scrollbar-track {
    background: transparent;
}

.tree-container::-webkit-scrollbar-thumb {
    background: #d1d5db;
    border-radius: 3px;
}

.tree-container::-webkit-scrollbar-thumb:hover {
    background: #9ca3af;
}

/* Планшеты (768px и выше) */
@media (min-width: 768px) {
    body {
        padding: var(--spacing-md);
    }

    .container {
        max-width: 1200px;
        border-radius: var(--radius);
        border: 1px solid var(--color-border);
        margin-top: var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }

    nav {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        padding: var(--spacing-md) var(--spacing-lg);
    }

    nav > div:first-child {
        flex-direction: row;
        gap: var(--spacing-lg);
        width: auto;
    }

    nav > div:first-child a {
        padding: 0;
        min-height: auto;
    }

    nav > div:last-child {
        padding-top: 0;
        border-top: none;
        width: auto;
        text-align: right;
    }

    header {
        padding: var(--spacing-lg) var(--spacing-lg);
    }

    header h1 {
        font-size: 24px;
    }

    .stats {
        flex-direction: row;
        gap: var(--spacing-lg);
    }

    .stat-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }

    .controls {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        padding: var(--spacing-md) var(--spacing-lg);
    }

    .search-box {
        flex: 1;
        max-width: 400px;
    }

    .action-buttons {
        width: auto;
    }

    .btn-action {
        flex: none;
    }

    .tree-container {
        padding: var(--spacing-lg);
        max-height: calc(100vh - 250px);
    }

    .tree-children {
        padding-left: var(--spacing-xl);
    }

    .node-content {
        padding: 8px var(--spacing-sm);
    }
}

/* Десктопы (1024px и выше) */
@media (min-width: 1024px) {
    .container {
        margin-top: var(--spacing-lg);
        margin-bottom: var(--spacing-lg);
    }

    header h1 {
        font-size: 28px;
    }

    .tree-container {
        max-height: calc(100vh - 280px);
    }
}

/* Улучшения для touch-устройств */
@media (hover: none) and (pointer: coarse) {
    .node-content:hover {
        background: transparent;
    }

    .btn-action:hover {
        background: var(--color-surface);
        border-color: var(--color-border);
        color: var(--color-text);
    }
}