/* Base Custom Properties (Light Theme default) */
:root {
    --bg-color: #f8f9fa;
    --text-color: #212529;
    --card-bg: #ffffff;
    --card-border: #dee2e6;
    --primary-color: #0d6efd;
    --primary-hover: #0b5ed7;
    --secondary-bg: #e9ecef;
    --secondary-text: #6c757d;
    --tag-bg: #e2e3e5;
    --tag-text: #41464b;
    --header-overlay: rgba(0,0,0,0.6);
    --header-text: #ffffff;
    --focus-ring: rgba(13, 110, 253, 0.25);
}

/* Dark Theme Support via System Preference OR Explicit Override */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-color: #121212;
        --text-color: #e0e0e0;
        --card-bg: #1e1e1e;
        --card-border: #333333;
        --primary-color: #3b82f6;
        --primary-hover: #60a5fa;
        --secondary-bg: #2d2d2d;
        --secondary-text: #a0a0a0;
        --tag-bg: #374151;
        --tag-text: #d1d5db;
        --header-overlay: rgba(0,0,0,0.7);
    }
}

:root[data-theme="dark"] {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --card-bg: #1e1e1e;
    --card-border: #333333;
    --primary-color: #3b82f6;
    --primary-hover: #60a5fa;
    --secondary-bg: #2d2d2d;
    --secondary-text: #a0a0a0;
    --tag-bg: #374151;
    --tag-text: #d1d5db;
    --header-overlay: rgba(0,0,0,0.7);
}

/* CSS Reset & Accessibility Base */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

a {
    color: var(--primary-color);
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}

:focus {
    outline: 3px solid var(--primary-hover);
    outline-offset: 2px;
}

/* Header overlay styles */
.header {
    position: relative;
    background-size: cover;
    background-position: center;
    background-color: var(--secondary-bg); /* Fallback */
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    max-width: 1200px;
    margin: 1rem auto;
    border-radius: 12px;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--header-overlay);
}

.header-content {
    position: relative;
    z-index: 1;
    color: var(--header-text);
    padding: 0 20px;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.header p {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.header-links a {
    color: var(--header-text);
    margin: 0 10px;
    font-weight: bold;
    text-decoration: underline;
}

.header-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 15px;
}

.submit-btn {
    font-size: 1.1rem;
    padding: 10px 20px;
}

.theme-btn {
    font-size: 1.5rem;
    padding: 5px 15px;
}

/* Main Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Controls (Search & Filters) */
.controls {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.search-bar input {
    width: 100%;
    padding: 0.75rem;
    font-size: 1.1rem;
    border: 1px solid var(--card-border);
    border-radius: 4px;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin-bottom: 1.5rem;
}

.filters {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    align-items: start;
}

.filter-group {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
}

.filter-group label {
    font-weight: bold;
    color: var(--header-bg);
    border-bottom: 2px solid var(--secondary-bg);
    padding-bottom: 4px;
    width: 100%;
}

.tag-filters {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    width: 100%;
}

.tag-filters label {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-weight: normal;
    background-color: var(--secondary-bg);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
}

.filter-actions {
    grid-column: 1 / -1;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--card-border);
}

.result-count {
    font-weight: bold;
    color: var(--secondary-text);
}

select {
    padding: 0.5rem;
    border-radius: 4px;
    border: 1px solid var(--card-border);
    background-color: var(--bg-color);
    color: var(--text-color);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    transition: background-color 0.2s;
}

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

.primary-btn:hover {
    background-color: var(--primary-hover);
    text-decoration: none;
}

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

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

/* Records Grid */
.records-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

/* Card */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.card-header {
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
}

@media (max-width: 600px) {
    .card-header {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .card-meta {
        text-align: left;
    }
}

.card-title {
    font-size: 1.25rem;
    margin-bottom: 0;
    flex: 1;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-title a {
    color: var(--text-color);
}

.card-meta {
    font-size: 0.85rem;
    color: var(--secondary-text);
    text-align: right;
    white-space: nowrap;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--card-border);
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    flex: 1; /* Pushes the actions to the right */
}

.tag {
    background-color: var(--tag-bg);
    color: var(--tag-text);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

.tag.machine { background-color: #e0f2fe; color: #0369a1; }
.tag.tool { background-color: #d1fae5; color: #047857; }
.tag.type { background-color: #fee2e2; color: #b91c1c; }
.tag.official { background-color: #dcfce7; color: #166534; }
.tag.unofficial { background-color: #fef08a; color: #854d0e; }
.tag.difficulty { background-color: #f3e8ff; color: #6b21a8; }
.tag.cost { background-color: #e0e7ff; color: #3730a3; }
.tag.language { background-color: #cffafe; color: #0891b2; } /* Cyan block */

.card-description {
    margin-bottom: 1.25rem;
    font-size: 1.05rem;
    color: var(--text-color);
    line-height: 1.5;
}

/* Dark mode adjustments for specific tags */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .tag.machine { background-color: rgba(59, 130, 246, 0.2); color: #93c5fd; }
    :root:not([data-theme="light"]) .tag.tool { background-color: rgba(52, 211, 153, 0.2); color: #6ee7b7; }
    :root:not([data-theme="light"]) .tag.type { background-color: rgba(248, 113, 113, 0.2); color: #fca5a5; }
}

:root[data-theme="dark"] .tag.machine { background-color: rgba(59, 130, 246, 0.2); color: #93c5fd; }
:root[data-theme="dark"] .tag.tool { background-color: rgba(52, 211, 153, 0.2); color: #6ee7b7; }
:root[data-theme="dark"] .tag.type { background-color: rgba(248, 113, 113, 0.2); color: #fca5a5; }
:root[data-theme="dark"] .tag.official { background-color: rgba(34, 197, 94, 0.2); color: #4ade80; }
:root[data-theme="dark"] .tag.unofficial { background-color: rgba(234, 179, 8, 0.2); color: #fde047; }
:root[data-theme="dark"] .tag.difficulty { background-color: rgba(168, 85, 247, 0.2); color: #d8b4fe; }
:root[data-theme="dark"] .tag.cost { background-color: rgba(99, 102, 241, 0.2); color: #a5b4fc; }
:root[data-theme="dark"] .tag.language { background-color: rgba(6, 182, 212, 0.2); color: #67e8f9; }

.card-actions {
    display: flex;
    gap: 0.5rem;
    flex-shrink: 0;
}

.card-actions .btn {
    padding: 0.5rem 1.5rem;
}

/* Favorites Button */
.favorite-btn {
    background: none;
    border: none;
    color: var(--secondary-text);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    transition: color 0.2s, transform 0.2s;
    outline: none;
}

.favorite-btn:hover {
    color: #f59e0b; /* Amber 500 */
    transform: scale(1.1);
}

.favorite-btn.is-active {
    color: #f59e0b; /* Amber 500 */
}

/* Copy Link Button */
.copy-link-btn {
    background: none;
    border: none;
    color: var(--secondary-text);
    cursor: pointer;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s, transform 0.2s;
    outline: none;
    margin-left: 0.25rem;
}

.copy-link-btn:hover {
    color: var(--primary-color);
    transform: scale(1.1);
}

/* Jump to Top Button */
#jump-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: var(--primary-color);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    display: none; /* Hidden by default */
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    z-index: 1000;
    transition: opacity 0.3s, background-color 0.2s;
}
#jump-top:hover {
    background-color: var(--primary-hover);
}