/* Basic Reset & Variables */
:root {
    --bg-color: #ffffff;
    --text-color: #333333;
    --primary-color: #007bff;
    --border-color: #dee2e6;
    --card-bg: #f8f9fa;
    --input-bg: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --swatch-border: #cccccc;
    --copy-feedback-bg: rgba(0, 0, 0, 0.7);
    --copy-feedback-text: #ffffff;
    --tooltip-bg: #333;
    --tooltip-text: #fff;
    --link-color: #0056b3;

    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --border-radius: 4px;
    --transition-speed: 0.2s;
}

body.dark-theme {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --primary-color: #4dabf7;
    --border-color: #444444;
    --card-bg: #2c2c2c;
    --input-bg: #333333;
    --shadow-color: rgba(255, 255, 255, 0.1);
    --swatch-border: #555555;
    --copy-feedback-bg: rgba(255, 255, 255, 0.8);
    --copy-feedback-text: #000000;
    --tooltip-bg: #eee;
    --tooltip-text: #333;
    --link-color: #69b7ff;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--card-bg);
    transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

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

#theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}
#theme-toggle:hover {
     background-color: var(--border-color);
}
.dark-theme #theme-toggle .sun-icon { display: none; }
.light-theme #theme-toggle .moon-icon { display: none; }


/* Main Content */
main {
    flex-grow: 1;
    padding: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Input Section */
.color-input-section {
    margin-bottom: var(--spacing-lg);
    position: relative; /* For tooltip positioning */
}
.color-input-section h2 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
}
.input-controls {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    flex-wrap: wrap; /* Allow wrapping on small screens */
}
#color-input {
    flex-grow: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    background-color: var(--input-bg);
    color: var(--text-color);
    min-width: 150px; /* Minimum width before wrapping */
    transition: border-color var(--transition-speed) ease, background-color var(--transition-speed) ease;
}
#color-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

/* Tooltip */
.error-tooltip {
    position: fixed; /* Use fixed for viewport positioning */
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--tooltip-bg);
    color: var(--tooltip-text);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    z-index: 1000;
    box-shadow: 0 2px 5px var(--shadow-color);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none; /* Avoid blocking clicks */
}
.error-tooltip.visible {
    opacity: 1;
}

/* Search Suggestions */
.search-suggestions {
    position: absolute;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    max-height: 150px;
    overflow-y: auto;
    z-index: 10;
    width: calc(100% - 120px); /* Adjust width based on button sizes */
    box-shadow: 0 2px 5px var(--shadow-color);
    margin-top: 2px;
}
.suggestion-item {
    padding: var(--spacing-xs) var(--spacing-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}
.suggestion-item:hover {
    background-color: var(--border-color);
}
.suggestion-swatch {
    width: 16px;
    height: 16px;
    border: 1px solid var(--swatch-border);
    border-radius: 2px;
    display: inline-block;
}

/* Pickr (Color Picker) */
.pickr-container {
    position: relative; /* Needed for Pickr positioning */
}
.pcr-button { /* Style Pickr's button if needed */
    display: none; /* Hide default button, use our button */
}

/* Current Color Display */
.current-color-display {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}
.large-swatch {
    width: 100px;
    height: 100px;
    border: 1px solid var(--swatch-border);
    border-radius: var(--border-radius);
    position: relative; /* For favorite button and feedback */
    overflow: hidden; /* Hide feedback initially */
    transition: background-color var(--transition-speed) ease;
}
.color-values {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}
.color-value {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: monospace;
    font-size: 0.9rem;
}

/* Buttons */
button {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--card-bg);
    color: var(--text-color);
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease, transform 0.1s ease;
}
button:hover:not(:disabled) {
    background-color: var(--border-color);
    border-color: #aaa;
}
button:active:not(:disabled) {
    transform: scale(0.98);
}
button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}
.icon-button {
    background: none;
    border: none;
    padding: var(--spacing-xs);
    line-height: 0; /* Prevent extra space */
    color: inherit; /* Inherit color */
}
.icon-button svg {
    width: 18px;
    height: 18px;
    vertical-align: middle;
}

/* Favorite Button */
.favorite-button {
    position: absolute;
    top: var(--spacing-xs);
    right: var(--spacing-xs);
    background-color: rgba(255, 255, 255, 0.7); /* Semi-transparent background */
    border-radius: 50%;
    padding: 5px;
    color: #555;
    transition: transform 0.2s ease, color 0.2s ease;
}
.favorite-button:hover {
    background-color: rgba(255, 255, 255, 0.9);
    transform: scale(1.1);
}
.favorite-button svg {
     width: 20px;
     height: 20px;
}
.favorite-button .heart-filled { display: none; }
.favorite-button.is-favorite .heart-empty { display: none; }
.favorite-button.is-favorite .heart-filled { display: block; color: #e53935; } /* Red heart */
.favorite-button.is-favorite:hover { color: #c62828; }

/* Copy Feedback */
.copy-feedback {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: var(--copy-feedback-bg);
    color: var(--copy-feedback-text);
    text-align: center;
    padding: var(--spacing-xs) 0;
    font-size: 0.8rem;
    opacity: 0;
    transform: translateY(100%);
    transition: opacity 0.3s ease, transform 0.3s ease;
    pointer-events: none;
}
.copy-feedback.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Action Buttons Section */
.action-buttons {
    margin-bottom: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* Harmony Palettes Section */
.harmony-palettes-section h2 {
    margin-bottom: var(--spacing-md);
    font-size: 1.2rem;
}
.harmony-palette {
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    background-color: var(--card-bg);
    box-shadow: 0 1px 3px var(--shadow-color);
    opacity: 1; /* Base for GSAP */
    transform: translateY(0); /* Base for GSAP */
}
.harmony-palette-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}
.harmony-palette-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    text-transform: capitalize;
}
.export-buttons {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}
.export-buttons button {
    font-size: 0.8rem;
    padding: var(--spacing-xs) var(--spacing-sm);
}
.palette-colors {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}
.color-swatch {
    width: 60px;
    height: 60px;
    border-radius: var(--border-radius);
    border: 1px solid var(--swatch-border);
    position: relative;
    overflow: hidden; /* Hide feedback */
    cursor: pointer;
    transition: transform 0.2s ease;
}
.color-swatch:hover {
    transform: scale(1.05);
    z-index: 1; /* Bring to front on hover */
}
.swatch-info {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    color: white;
    font-size: 0.75rem;
    padding: 2px 4px;
    text-align: center;
    opacity: 0;
    transition: opacity var(--transition-speed) ease;
    pointer-events: none; /* Don't block clicks on swatch */
    font-family: monospace;
}
.color-swatch:hover .swatch-info {
    opacity: 1;
}
.swatch-copy-button {
    position: absolute;
    top: 2px;
    right: 2px;
    background-color: rgba(255, 255, 255, 0.7);
    border-radius: 3px;
    padding: 2px;
    opacity: 0;
    transition: opacity var(--transition-speed) ease;
}
.color-swatch:hover .swatch-copy-button {
    opacity: 1;
}
.swatch-copy-button svg {
    width: 12px;
    height: 12px;
    display: block;
}

/* Favorites View */
.favorites-view {
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--card-bg);
    box-shadow: 0 1px 3px var(--shadow-color);
}
.favorites-view h2 {
    margin-bottom: var(--spacing-sm);
}
#back-to-main-button {
    margin-bottom: var(--spacing-md);
}
#export-favorites-button {
    margin-bottom: var(--spacing-lg);
}
.favorites-grid {
    display: grid;
    gap: var(--spacing-md);
    /* Responsive columns */
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); /* Default for mobile-first */
}
.favorite-card {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    background-color: var(--bg-color); /* Use main bg for contrast */
    position: relative;
    box-shadow: 0 1px 2px var(--shadow-color);
    transition: transform 0.2s ease;
}
.favorite-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 3px 6px var(--shadow-color);
}
.favorite-card-swatch-link {
    display: block;
    text-decoration: none;
}
.favorite-card-swatch {
    display: block;
    width: 100%;
    padding-top: 60%; /* 5:3 aspect ratio (3/5 * 100) */
    background-color: #ccc; /* Placeholder */
    border-bottom: 1px solid var(--border-color);
}
.favorite-card-info {
    padding: var(--spacing-sm);
}
.favorite-card-hex {
    font-weight: 600;
    font-family: monospace;
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-color); /* Ensure text is readable */
    word-break: break-all;
}
.favorite-card-copy {
    position: absolute;
    bottom: var(--spacing-sm);
    right: var(--spacing-sm);
}
#no-favorites-message {
    grid-column: 1 / -1; /* Span all columns */
    text-align: center;
    color: #888;
    padding: var(--spacing-lg);
}


/* Footer */
footer {
    text-align: center;
    padding: var(--spacing-md);
    margin-top: var(--spacing-lg);
    font-size: 0.85rem;
    color: #888;
    border-top: 1px solid var(--border-color);
}
.dark-theme footer {
    color: #aaa;
}

/* Accessibility */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(0, 123, 255, 0.3);
}
/* Hide focus outline if not using keyboard */
*:focus:not(:focus-visible) {
   outline: none;
   box-shadow: none;
}

/* Animations (Base styles for GSAP) */
.harmony-palette, .favorite-card {
    opacity: 0; /* Start hidden for fade-in */
}

/* Responsive Design */
@media (min-width: 600px) {
    .favorites-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }
    .color-swatch {
        width: 80px;
        height: 80px;
    }
    header h1 {
        font-size: 1.8rem;
    }
}

@media (min-width: 992px) {
    main {
        display: flex;
        gap: var(--spacing-lg);
    }
    .main-content {
        flex: 2; /* Takes more space */
        max-width: 750px; /* Limit width */
    }
    .favorites-view {
        flex: 1; /* Takes remaining space */
        max-width: 400px; /* Limit width */
    }
     /* Adjust favorites grid for larger screens if needed */
     .favorites-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); /* Example: 3 columns */
    }
    .color-swatch {
        width: 100px;
        height: 100px;
    }
     /* Keep input section reasonable */
    .color-input-section {
        max-width: 500px;
    }
}

/* Specific overrides for Pickr */
.pcr-app {
    z-index: 100; /* Ensure picker is above other elements */
    /* Apply theme variables if possible/needed */
    background: var(--card-bg);
    box-shadow: 0 3px 10px var(--shadow-color);
}
.pcr-app .pcr-interaction input {
    background-color: var(--input-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}
/* Add more specific Pickr styling as needed */