/* Reset и базовые стили */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563EB;
    --text-color: #111827;
    --text-secondary: #6B7280;
    --border-color: #E5E7EB;
    --bg-color: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --error-color: #EF4444;
    --success-color: #10B981;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 100%;
    padding: 1rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Экраны */
.screen {
    display: none;
    flex-direction: column;
    min-height: 100vh;
}

.screen-active {
    display: flex;
}

/* Header */
header {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.limit-indicator {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.limit-indicator strong {
    color: var(--primary-color);
    font-weight: 600;
}

.back-btn {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--text-color);
    cursor: pointer;
    padding: 0.5rem;
    margin-bottom: 0.5rem;
}

/* Категории */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.category-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.category-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.category-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.category-card h2 {
    font-size: 1.125rem;
    margin-bottom: 0.25rem;
}

.category-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Пресеты */
.presets-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.preset-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    cursor: pointer;
    transition: all 0.2s;
}

.preset-card:hover {
    border-color: var(--primary-color);
}

.preset-card h3 {
    font-size: 1.125rem;
    margin-bottom: 0.25rem;
}

.preset-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Загрузка фото */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 3rem 1rem;
    text-align: center;
    cursor: pointer;
    margin-bottom: 1rem;
    transition: all 0.2s;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: var(--bg-secondary);
}

.upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.upload-icon {
    font-size: 3rem;
}

.preview-image {
    max-width: 100%;
    max-height: 400px;
    border-radius: 12px;
    margin: 0 auto;
    display: block;
}

.upload-info {
    background: #FEF3C7;
    border: 1px solid #FCD34D;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

/* Кнопки */
.btn-primary,
.btn-secondary {
    width: 100%;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 0.5rem;
}

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

.btn-primary:hover:not(:disabled) {
    background: #1D4ED8;
}

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

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

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

/* Прогресс */
.progress-container {
    text-align: center;
    padding: 2rem 0;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 1rem;
}

.progress-fill {
    height: 100%;
    background: var(--primary-color);
    width: 0%;
    transition: width 0.3s;
}

.progress-warning {
    background: #FEF3C7;
    border: 1px solid #FCD34D;
    border-radius: 8px;
    padding: 1rem;
    margin-top: 1rem;
    font-size: 0.875rem;
}

/* Результат */
.result-container {
    margin: 1rem 0;
    text-align: center;
}

.result-image {
    max-width: 100%;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.result-actions {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

/* История */
.history-filters {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    overflow-x: auto;
    padding-bottom: 0.5rem;
}

.filter-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background: var(--bg-color);
    border-radius: 20px;
    cursor: pointer;
    white-space: nowrap;
    font-size: 0.875rem;
}

.filter-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.history-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1rem;
}

.history-item {
    aspect-ratio: 1;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    position: relative;
}

.history-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

/* Лимит */
.limit-message {
    text-align: center;
    padding: 2rem 1rem;
}

.limit-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

/* Bottom nav */
.bottom-nav {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.nav-btn {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.875rem;
}

/* Адаптивность */
@media (max-width: 480px) {
    .container {
        padding: 0.75rem;
    }
    
    header h1 {
        font-size: 1.25rem;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
}