/* CSS Custom Properties for better maintainability */
:root {
    --primary-color: #4CAF50;
    --primary-hover: #45a049;
    --secondary-color: #FF9800;
    --error-color: #d32f2f;
    --error-bg: #ffebee;
    --text-color: #333;
    --text-secondary: #555;
    --border-color: #e0e0e0;
    --bg-light: #f8f9fa;
    --bg-secondary: #e9ecef;
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-strong: rgba(0, 0, 0, 0.3);
    --border-radius: 10px;
    --border-radius-large: 20px;
    --transition: all 0.3s ease;
    
    /* Light mode specific */
    --body-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --container-bg: rgba(255, 255, 255, 0.95);
    --header-bg: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    --card-bg: white;
    --input-bg: white;
    --result-bg: rgba(76, 175, 80, 0.1);
    --result-border: rgba(76, 175, 80, 0.3);
    --compare-bg-1: rgba(76, 175, 80, 0.1);
    --compare-bg-2: rgba(255, 152, 0, 0.1);
}

/* Dark mode variables */
[data-theme="dark"] {
    --primary-color: #66BB6A;
    --primary-hover: #5CB660;
    --secondary-color: #FFB74D;
    --error-color: #f44336;
    --error-bg: rgba(244, 67, 54, 0.1);
    --text-color: #e0e0e0;
    --text-secondary: #b0b0b0;
    --border-color: #404040;
    --bg-light: #2a2a2a;
    --bg-secondary: #363636;
    --shadow-light: rgba(0, 0, 0, 0.3);
    --shadow-strong: rgba(0, 0, 0, 0.6);
    
    /* Dark mode specific */
    --body-bg: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    --container-bg: rgba(42, 42, 42, 0.95);
    --header-bg: linear-gradient(135deg, #2a2a2a 0%, #1f1f1f 100%);
    --card-bg: #333333;
    --input-bg: #404040;
    --result-bg: rgba(102, 187, 106, 0.15);
    --result-border: rgba(102, 187, 106, 0.4);
    --compare-bg-1: rgba(102, 187, 106, 0.15);
    --compare-bg-2: rgba(255, 183, 77, 0.15);
}

/* Smooth theme transitions */
*, *::before, *::after {
    transition: background-color var(--transition), 
                border-color var(--transition), 
                color var(--transition), 
                box-shadow var(--transition);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--body-bg);
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
    color: var(--text-color);
    transition: var(--transition);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--container-bg);
    border-radius: var(--border-radius-large);
    box-shadow: 0 20px 40px var(--shadow-light);
    overflow: hidden;
    transition: var(--transition);
}

.header {
    background: var(--header-bg);
    color: white;
    padding: 30px;
    text-align: center;
    position: relative;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px var(--shadow-strong);
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Dark Mode Toggle */
.dark-mode-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.dark-mode-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1) rotate(10deg);
}

.dark-mode-toggle .toggle-icon {
    font-size: 1.5rem;
    transition: var(--transition);
}

/* Navigation Links */
.navigation-links {
    padding: 20px 30px;
    background: var(--bg-light);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
}

.navigation-links a {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%) !important;
    color: white !important;
    padding: 10px 20px;
    border-radius: var(--border-radius);
    text-decoration: none !important;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 12px var(--shadow-light);
}

.navigation-links a:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(76, 175, 80, 0.3);
    background: linear-gradient(135deg, var(--primary-hover) 0%, var(--primary-color) 100%) !important;
    color: white !important;
    text-decoration: none !important;
}

.navigation-links a:visited {
    color: white !important;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%) !important;
}

.navigation-links a:link {
    color: white !important;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%) !important;
}

.navigation-links a:active {
    transform: translateY(0);
}

@media (max-width: 768px) {
    .navigation-links {
        padding: 15px 20px;
        gap: 10px;
    }
    
    .navigation-links a {
        font-size: 0.9rem;
        padding: 8px 16px;
    }
    
    /* Improve dark mode toggle for mobile */
    .dark-mode-toggle {
        width: 60px;
        height: 60px;
        top: 15px;
        right: 15px;
        /* Ensure it's above other elements */
        z-index: 1000;
        /* Improve touch target */
        min-width: 44px;
        min-height: 44px;
    }
    
    .dark-mode-toggle .toggle-icon {
        font-size: 1.8rem;
    }
    
    /* Ensure the button is accessible on smaller screens */
    .header {
        position: relative;
        /* Add padding to prevent overlap with toggle */
        padding-right: 80px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
}

/* Dark mode specific improvements */
[data-theme="dark"] .calculator {
    background: var(--card-bg);
    border-radius: var(--border-radius-large);
}

[data-theme="dark"] .filter-btn {
    background: var(--card-bg);
    color: var(--text-color);
    border-color: var(--border-color);
}

[data-theme="dark"] .filter-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--primary-color);
}

[data-theme="dark"] .filter-btn.active {
    background: var(--primary-color);
    color: white;
}

[data-theme="dark"] .fab {
    background: var(--primary-color);
    box-shadow: 0 8px 25px rgba(102, 187, 106, 0.4);
}

[data-theme="dark"] .mobile-filter-dropdown {
    background: var(--input-bg);
    color: var(--text-color);
    border-color: var(--border-color);
}

[data-theme="dark"] .mobile-filter-dropdown option {
    background: var(--input-bg);
    color: var(--text-color);
}

/* Improved dark mode text contrast */
[data-theme="dark"] .pet-card .pet-name {
    color: var(--text-color);
}

[data-theme="dark"] .pet-card .pet-source {
    color: var(--text-secondary);
}

[data-theme="dark"] .result h3 {
    color: var(--primary-color);
}

[data-theme="dark"] .result p {
    color: var(--text-color);
}

.calculator {
    padding: 40px;
    transition: var(--transition);
}

.form-group {
    margin-bottom: 25px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-color);
    font-size: 1.1rem;
}

select, input {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--input-bg);
    color: var(--text-color);
}

select:focus, input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 187, 106, 0.2);
}

/* Improved accessibility for inputs */
select:focus-visible, input:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.calculate-btn {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    padding: 15px 30px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
    margin-top: 20px;
}

.calculate-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(76, 175, 80, 0.3);
}

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

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

.link-btn {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #e68900 100%);
    color: white;
    padding: 12px 25px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 10px;
    margin-left: 10px;
    display: inline-block;
}

.link-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 152, 0, 0.3);
}

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

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

.pet-card-btn {
    background: linear-gradient(135deg, #9C27B0 0%, #7B1FA2 100%);
    color: white;
    padding: 12px 25px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 10px;
    margin-left: 10px;
    display: inline-block;
}

.pet-card-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(156, 39, 176, 0.3);
}

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

.pet-card-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.button-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
}

.button-container .calculate-btn {
    margin-top: 0;
    flex: 1;
    min-width: 150px;
}

.button-container .link-btn {
    margin-top: 0;
    margin-left: 0;
    flex: 0 0 auto;
}

.button-container .pet-card-btn {
    margin-top: 0;
    margin-left: 0;
    flex: 0 0 auto;
}

@media (max-width: 768px) {
    .button-container {
        flex-direction: column;
    }
    
    .button-container .calculate-btn,
    .button-container .link-btn,
    .button-container .pet-card-btn {
        width: 100%;
        flex: none;
    }

    .fab {
        display: flex;
    }

    .button-container .calculate-btn {
        display: none; /* Hide original button on mobile */
    }
}

.result {
    margin-top: 30px;
    padding: 25px;
    background: var(--result-bg);
    border-radius: 15px;
    border-left: 5px solid var(--primary-color);
    display: none;
    transition: var(--transition);
}

.result.show {
    display: block;
    animation: fadeInUp 0.5s ease;
}

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

.result h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.result p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 1.1rem;
    white-space: pre-line;
}

.pet-icon {
    display: inline-block;
    margin-right: 10px;
    font-size: 1.2rem;
}

.pet-icon img {
    width: 1.2em;
    height: 1.2em;
    object-fit: contain;
    vertical-align: middle;
}

.error {
    color: var(--error-color);
    background: var(--error-bg);
    border-left-color: var(--error-color);
}

.checkbox-container {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px;
    background: rgba(76, 175, 80, 0.05);
    border-radius: var(--border-radius);
    border: 2px solid rgba(76, 175, 80, 0.2);
    transition: var(--transition);
}

.checkbox-container:hover {
    background: var(--compare-bg-1);
    border-color: var(--result-border);
}

.checkbox-container input[type="checkbox"] {
    width: auto;
    height: 18px;
    margin: 0;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.checkbox-container label {
    margin: 0;
    cursor: pointer;
    font-weight: 500;
    color: var(--primary-color);
    font-size: 1rem;
}

/* Screen reader only content */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Loading state */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

/* Better responsive design */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }
    
    .calculator {
        padding: 20px;
    }
    
    #compareWeightInputs > div {
        flex-direction: column !important;
        gap: 10px !important;
    }

    #compareAgeInputs {
        flex-direction: column !important;
        gap: 10px !important;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    
    .header {
        padding: 20px;
    }
    
    .header h1 {
        font-size: 1.8rem;
    }
    
    #compareResult > div {
        grid-template-columns: 1fr !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000;
        --text-color: #000;
        --text-secondary: #000;
    }
}

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

/* Mobile dropdown filters - shown only on mobile */
.mobile-filter-dropdown {
    display: none;
    margin-bottom: 15px;
}

/* Desktop button filters - shown by default */
.desktop-filter-buttons {
    display: flex;
}

/* Type filter buttons */
.type-filters {
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 15px;
    justify-content: center;
}

.filter-btn {
    padding: 6px 10px;
    border: 2px solid var(--border-color);
    background: white;
    color: var(--text-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.8rem;
    transition: var(--transition);
    white-space: nowrap;
    flex-shrink: 0;
}

.filter-btn:hover {
    background: var(--bg-light);
    border-color: var(--primary-color);
}

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

.filter-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Mobile responsive behavior */
@media (max-width: 768px) {
    /* Hide desktop button filters on mobile */
    .desktop-filter-buttons {
        display: none;
    }
    
    /* Show mobile dropdown filters on mobile */
    .mobile-filter-dropdown {
        display: block;
    }
}

/* Rarity filter button styles */
.filter-btn.rarity-common.active {
    background: #ffffff;
    color: black;
    border-color: #ffffff;
}

.filter-btn.rarity-uncommon.active {
    background: #d3a781;
    color: white;
    border-color: #d3a781;
}

.filter-btn.rarity-rare.active {
    background: #2154b9;
    color: white;
    border-color: #2154b9;
}

.filter-btn.rarity-legendary.active {
    background: #a3782d;
    color: white;
    border-color: #a3782d;
}

.filter-btn.rarity-mythical.active {
    background: #aa55ff;
    color: white;
    border-color: #aa55ff;
}

.filter-btn.rarity-divine.active {
    background: #ff5500;
    color: white;
    border-color: #ff5500;
}

.filter-btn.rarity-prismatic.active {
    background: #ff00ff;
    color: white;
    border-color: #ff00ff;
}

/* Search input styling */
#petSearch {
    margin-bottom: 15px;
}

/* Pet grid alternative view */
.pet-grid-toggle {
    text-align: center;
    margin-bottom: 20px;
}

.view-toggle {
    background: var(--secondary-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
}

.view-toggle:hover {
    opacity: 0.8;
}

.pet-grid {
    display: none;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    max-height: 400px;
    overflow-y: auto;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 15px;
    background: var(--bg-light);
}

.pet-grid.show {
    display: grid;
}

.pet-card {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 12px;
    cursor: pointer;
    text-align: center;
    transition: var(--transition);
    position: relative;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
}

.pet-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px var(--shadow-light);
    transform: translateY(-2px);
}

.pet-card:active {
    transform: translateY(-1px) scale(0.98);
    background: rgba(76, 175, 80, 0.05);
}

.pet-card.selected {
    border-color: var(--primary-color);
    background: var(--compare-bg-1);
}

.pet-card .pet-icon {
    font-size: 2rem;
    margin-bottom: 8px;
    display: block;
}

.pet-card .pet-icon img {
    width: 2em;
    height: 2em;
    object-fit: contain;
}

.pet-card .pet-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-color);
    line-height: 1.2;
}

.pet-card .pet-type {
    font-size: 0.6rem;
    color: var(--text-secondary);
    margin-top: 4px;
    opacity: 0.8;
}

.pet-card .pet-rarity {
    font-size: 0.7rem;
    font-weight: bold;
    margin-top: 2px;
}

/* Rarity-based border colors for pet cards */
.pet-card[data-rarity="Common"] {
    border-left: 3px solid #ffffff;
}

.pet-card[data-rarity="Uncommon"] {
    border-left: 3px solid #d3a781;
}

.pet-card[data-rarity="Rare"] {
    border-left: 3px solid #2154b9;
}

.pet-card[data-rarity="Legendary"] {
    border-left: 3px solid #a3782d;
}

.pet-card[data-rarity="Mythical"] {
    border-left: 3px solid #aa55ff;
}

.pet-card[data-rarity="Divine"] {
    border-left: 3px solid #ff5500;
}

.pet-card[data-rarity="Prismatic"] {
    border-left: 3px solid #ff00ff;
}

/* Hide dropdown when grid is active */
.dropdown-mode .pet-grid {
    display: none;
}

.grid-mode select#petSelect {
    display: none;
}

@media (max-width: 768px) {
    .pet-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 10px;
        padding: 10px;
    }
    
    .pet-card {
        padding: 10px;
        min-height: 100px;
        /* Ensure minimum touch target size of 44px */
        min-width: 44px;
    }
    
    .pet-card .pet-icon {
        font-size: 1.5rem;
        margin-bottom: 6px;
    }
    
    .pet-card .pet-icon img {
        width: 1.5em;
        height: 1.5em;
    }
    
    .pet-card .pet-name {
        font-size: 0.8rem;
    }
    
    /* Enhanced touch feedback on mobile */
    .pet-card:active {
        transform: scale(0.95);
        background: var(--compare-bg-1);
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    
    .header {
        padding: 20px;
    }
    
    .header h1 {
        font-size: 1.8rem;
    }
    
    #compareResult > div {
        grid-template-columns: 1fr !important;
    }
}

/* Floating Action Button for Mobile */
.fab {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    border: none;
    box-shadow: 0 6px 15px var(--shadow-strong);
    font-size: 1.8rem;
    cursor: pointer;
    z-index: 1000;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s ease-out;
}

.fab:hover {
    transform: scale(1.05);
}