/* CSS Variables for Theme Support */
:root {
    /* Light Theme Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --border-color: #dee2e6;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 16px rgba(0,0,0,0.16);

    /* Accent Colors */
    --accent-primary: #4a90e2;
    --accent-success: #28a745;
    --accent-warning: #ffc107;
    --accent-danger: #dc3545;
    --accent-info: #17a2b8;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-xxl: 1.5rem;
    --font-size-xxxl: 2rem;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #404040;
    --text-primary: #e9ecef;
    --text-secondary: #adb5bd;
    --text-muted: #6c757d;
    --border-color: #495057;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 16px rgba(0,0,0,0.5);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    z-index: 1000;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: grid;
    place-items: center;
    cursor: pointer;
    font-size: 1.5rem;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

/* Main Header - Compact Modern Design */
.main-header {
    background: var(--bg-primary);
    border-bottom: 2px solid var(--border-color);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 200;
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: grid;
    grid-template-columns: auto auto;
    grid-template-rows: auto auto;
    align-items: center;
    gap: var(--spacing-sm);
}

@media (max-width: 767px) {
    .header-content {
        grid-template-areas:
            "brand filter"
            "search search";
    }

    .header-brand {
        grid-area: brand;
    }

    .header-search {
        grid-area: search;
    }

    .filter-toggle {
        grid-area: filter;
        justify-self: end;
    }
}

.header-brand {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-sm);
}

.app-title {
    font-size: var(--font-size-xl);
    font-weight: 800;
    color: var(--text-primary);
    margin: 0;
    letter-spacing: -0.02em;
}

.title-accent {
    color: var(--accent-primary);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.app-tagline {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    display: none;
}

/* Header Search */
.header-search {
    max-width: 500px;
    width: 100%;
    justify-self: center;
}

.header-search .search-wrapper {
    margin: 0;
}

.header-search .search-input {
    height: 40px;
    border-radius: 20px;
    padding: 0 var(--spacing-lg);
    padding-left: 2.5rem;
    font-size: var(--font-size-sm);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
}

.header-search .search-icon {
    top: 50%;
    left: var(--spacing-md);
    font-size: 1rem;
}

/* Filter Toggle Button */
.filter-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
    font-weight: 600;
    position: relative;
}

.filter-toggle:hover {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
    transform: translateY(-1px);
}

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

.filter-icon {
    font-size: 1.2rem;
    transition: transform var(--transition-base);
}

.filter-toggle.active .filter-icon {
    transform: rotate(180deg);
}

.filter-text {
    display: none;
}

.filter-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background: var(--accent-danger);
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: grid;
    place-items: center;
    font-size: var(--font-size-xs);
    font-weight: bold;
    opacity: 0;
    transform: scale(0);
    transition: all var(--transition-fast);
}

.filter-badge.active {
    opacity: 1;
    transform: scale(1);
}

/* Disclaimer Banner */
.disclaimer-banner {
    background: var(--accent-warning);
    color: #212529;
    padding: var(--spacing-md) 0;
    border-bottom: 2px solid #e0a800;
}

.disclaimer-banner p {
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

/* Controls Section - Collapsible */
.controls-section {
    background: var(--bg-secondary);
    overflow: hidden;
    transition: all var(--transition-base);
    border-bottom: 1px solid var(--border-color);
}

.controls-section[data-collapsed="true"] {
    max-height: 0;
    padding: 0;
    border-bottom: none;
}

.controls-section[data-collapsed="false"] {
    max-height: 400px;
    padding: var(--spacing-lg) 0;
    animation: slideDown 0.3s ease;
}

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

/* Search Wrapper (now in header) */
.search-wrapper {
    position: relative;
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2);
}

.search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.25rem;
    pointer-events: none;
}

/* Filters Container - Mobile First with CSS Grid */
.filters-container {
    display: grid;
    gap: var(--spacing-md);
    grid-template-columns: 1fr;
    margin-bottom: var(--spacing-md);
}

.filter-group {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: var(--spacing-sm);
}

.filter-group label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-secondary);
    min-width: 80px;
}

.filter-select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.clear-filters-btn {
    grid-column: 1 / -1;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--accent-danger);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.clear-filters-btn:hover {
    background: #c82333;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Results Bar */
.results-bar {
    background: var(--bg-primary);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 85px;
    z-index: 90;
}

@media (min-width: 768px) {
    .results-bar {
        top: 65px;
    }
}

.results-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.clear-all-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: transparent;
    color: var(--accent-danger);
    border: 1px solid var(--accent-danger);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.clear-all-btn:hover {
    background: var(--accent-danger);
    color: white;
}

.clear-all-btn.hidden {
    display: none;
}

/* Main Content */
.main-content {
    padding: var(--spacing-xl) 0;
    min-height: 60vh;
}

/* Items Grid - Mobile First with CSS Grid */
.items-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

/* Item Card */
.item-card {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
    display: grid;
    gap: var(--spacing-sm);
}

.item-card:hover,
.item-card:focus {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-primary);
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

.item-card:focus {
    outline: 3px solid var(--accent-primary);
    outline-offset: 2px;
}

.item-card-header {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: start;
    gap: var(--spacing-md);
}

.item-card-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.item-card-type {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--accent-primary);
    color: white;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
}

.item-card-type.dieta {
    background: var(--accent-success);
}

.item-card-summary {
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    line-height: 1.5;
    margin: var(--spacing-sm) 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    height: calc(1.5em * 3);
}

.item-card-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.meta-item {
    display: grid;
    gap: var(--spacing-xs);
}

.meta-label {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 600;
}

.meta-value {
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

.item-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
}

.tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
}

/* Difficulty and Caution Indicators */
.difficulty-badge,
.caution-badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.difficulty-badge.zaciatocnik {
    background: #d4edda;
    color: #155724;
}

.difficulty-badge.stredna {
    background: #fff3cd;
    color: #856404;
}

.difficulty-badge.pokrocila {
    background: #f8d7da;
    color: #721c24;
}

.caution-badge.nizsia {
    background: #d4edda;
    color: #155724;
}

.caution-badge.stredna {
    background: #fff3cd;
    color: #856404;
}

.caution-badge.vyssia {
    background: #f8d7da;
    color: #721c24;
}

/* No Results State */
.no-results {
    text-align: center;
    padding: var(--spacing-xxl) var(--spacing-lg);
    color: var(--text-secondary);
}

.no-results p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-lg);
}

.btn-secondary {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: grid;
    place-items: center;
    padding: var(--spacing-md);
}

.modal.hidden {
    display: none;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: modalSlideIn 0.3s ease;
}

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

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--bg-tertiary);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    display: grid;
    place-items: center;
    transition: all var(--transition-fast);
    z-index: 1;
}

.modal-close:hover {
    background: var(--accent-danger);
    color: white;
    transform: rotate(90deg);
}

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

.modal-body h2 {
    font-size: var(--font-size-xxl);
    margin-top: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    color: var(--accent-primary);
}

.modal-body h3 {
    font-size: var(--font-size-xl);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

/* Modal Meta Section */
.modal-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
}

.modal-meta > * {
    display: inline-block;
}

/* Modal Content Body */
.modal-content-body {
    margin: var(--spacing-lg) 0;
    line-height: 1.7;
}

.modal-content-body h1 {
    font-size: var(--font-size-xxl);
    margin: var(--spacing-lg) 0 var(--spacing-md) 0;
    color: var(--accent-primary);
}

.modal-content-body h2 {
    font-size: var(--font-size-xl);
    margin: var(--spacing-lg) 0 var(--spacing-md) 0;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: var(--spacing-xs);
}

.modal-content-body h3 {
    font-size: var(--font-size-lg);
    margin: var(--spacing-md) 0 var(--spacing-sm) 0;
    color: var(--text-primary);
}

.modal-content-body strong {
    color: var(--text-primary);
    font-weight: 600;
}

.modal-content-body em {
    font-style: italic;
}

.modal-content-body ul,
.modal-content-body ol {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-lg);
}

.modal-content-body li {
    margin-bottom: var(--spacing-xs);
    line-height: 1.6;
}

.modal-content-body ul li {
    list-style-type: disc;
}

.modal-content-body ol li {
    list-style-type: decimal;
}

.modal-body p,
.modal-body ul,
.modal-body ol {
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.modal-body ul,
.modal-body ol {
    padding-left: var(--spacing-lg);
}

.modal-body li {
    margin-bottom: var(--spacing-sm);
}

.modal-disclaimer {
    background: var(--bg-tertiary);
    border-left: 4px solid var(--accent-warning);
    padding: var(--spacing-md);
    margin-top: var(--spacing-lg);
    border-radius: var(--radius-md);
}

/* Footer */
.main-footer {
    background: var(--bg-tertiary);
    padding: var(--spacing-lg) 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.main-footer p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

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

.highlight {
    background: #ffeb3b;
    color: #000;
    padding: 2px 4px;
    border-radius: 2px;
    font-weight: 600;
}

/* Tablet Styles (768px and up) */
@media (min-width: 768px) {
    .app-tagline {
        display: inline;
    }

    .filter-text {
        display: inline;
    }

    .header-content {
        grid-template-columns: auto 1fr auto;
        grid-template-areas: "brand search filter";
    }

    .header-brand {
        grid-area: brand;
    }

    .header-search {
        grid-area: search;
    }

    .filter-toggle {
        grid-area: filter;
    }

    .filters-container {
        grid-template-columns: repeat(2, 1fr);
    }

    .clear-filters-btn {
        grid-column: span 2;
    }

    .items-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .modal-content {
        max-width: 700px;
    }
}

/* Desktop Styles (1024px and up) */
@media (min-width: 1024px) {
    .main-header {
        padding: var(--spacing-lg) 0;
    }

    .app-title {
        font-size: var(--font-size-xxl);
    }

    .header-search .search-input {
        font-size: var(--font-size-base);
    }

    .filters-container {
        grid-template-columns: repeat(3, 1fr) auto;
        align-items: end;
    }

    .clear-filters-btn {
        grid-column: auto;
        align-self: stretch;
    }

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

    .modal-content {
        max-width: 800px;
    }
}

/* Large Desktop (1440px and up) */
@media (min-width: 1440px) {
    .items-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Print Styles */
@media print {
    .theme-toggle,
    .controls-section,
    .main-footer,
    .modal-close {
        display: none !important;
    }

    .disclaimer-banner {
        border: 2px solid black;
        padding: 1rem;
        margin-bottom: 1rem;
    }

    .items-grid {
        grid-template-columns: 1fr;
    }

    .item-card {
        break-inside: avoid;
        border: 1px solid black;
        margin-bottom: 1rem;
    }
}