:root {
    /* Light Mode Variables */
    --bg-color: #f4f6f9;
    --text-color: #333;
    --header-bg: #2c3e50;
    --header-text: #fff;
    --nav-bg: #34495e;
    --nav-link-hover: #1abc9c;
    --card-bg: #fff;
    --card-shadow: rgba(0,0,0,0.1);
    --card-hover-transform: translateY(-5px);
    --card-title: #2c3e50;
    --card-border: #1abc9c;
    --tag-bg: #ecf0f1;
    --tag-text: #7f8c8d;
    --desc-text: #666;
    --feature-bg: #e8f8f5;
    --feature-text: #16a085;
    --footer-bg: #2c3e50;
    --footer-text: #bdc3c7;
    --stat-bg: #fff;
    --stat-number: #1abc9c;
    
    /* Search Variables */
    --search-bg: #fff;
    --search-text: #333;
    --search-border: #ccc;
    --result-bg: #fff;
    --result-hover: #f0f0f0;
    --history-title: #666;
    --history-item-bg: #e0e0e0;
}

[data-theme="dark"] {
    /* Dark Mode Variables */
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --header-bg: #0f172a;
    --header-text: #e0e0e0;
    --nav-bg: #1e293b;
    --nav-link-hover: #3b82f6;
    --card-bg: #2d3748;
    --card-shadow: rgba(0,0,0,0.3);
    --card-title: #e0e0e0;
    --card-border: #3b82f6;
    --tag-bg: #4a5568;
    --tag-text: #a0aec0;
    --desc-text: #cbd5e0;
    --feature-bg: #2c5282;
    --feature-text: #90cdf4;
    --footer-bg: #0f172a;
    --footer-text: #94a3b8;
    --stat-bg: #2d3748;
    --stat-number: #3b82f6;

    /* Search Variables */
    --search-bg: #1e293b;
    --search-text: #e0e0e0;
    --search-border: #4a5568;
    --result-bg: #2d3748;
    --result-hover: #4a5568;
    --history-title: #a0aec0;
    --history-item-bg: #4a5568;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

header {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 1rem 0;
    text-align: center;
    position: relative; /* For positioning controls */
}

/* Controls container for theme/lang */
.controls {
    position: absolute;
    top: 1rem;
    right: 1rem;
    display: flex;
    gap: 0.5rem;
}

.control-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #fff;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.2s;
}

.control-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Search Bar Styles */
.search-container {
    position: relative;
    max-width: 500px;
    margin: 1rem auto 0.5rem;
    padding: 0 1rem;
}

#search-input {
    width: 100%;
    padding: 0.8rem 1rem;
    border-radius: 25px;
    border: 1px solid var(--search-border);
    background-color: var(--search-bg);
    color: var(--search-text);
    font-size: 1rem;
    outline: none;
    box-sizing: border-box; /* Fix padding issue */
}

#search-input:focus {
    border-color: var(--nav-link-hover);
    box-shadow: 0 0 5px rgba(26, 188, 156, 0.5);
}

#search-results {
    position: absolute;
    top: 100%;
    left: 1rem;
    right: 1rem;
    background-color: var(--result-bg);
    border: 1px solid var(--search-border);
    border-radius: 8px;
    max-height: 300px;
    overflow-y: auto;
    z-index: 1000;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    display: none; /* Hidden by default */
}

.search-result-item {
    padding: 0.8rem 1rem;
    border-bottom: 1px solid var(--search-border);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.search-result-item:last-child {
    border-bottom: none;
}

.search-result-item:hover {
    background-color: var(--result-hover);
}

.result-name {
    font-weight: bold;
    color: var(--card-title);
}

.result-category {
    font-size: 0.8rem;
    color: var(--desc-text);
    background-color: var(--tag-bg);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

/* History Styles */
.history-section {
    padding: 0.5rem 1rem;
}

.history-title {
    font-size: 0.85rem;
    color: var(--history-title);
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
}

.clear-history {
    cursor: pointer;
    color: var(--nav-link-hover);
}

.history-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.history-tag {
    background-color: var(--history-item-bg);
    color: var(--search-text);
    padding: 0.3rem 0.6rem;
    border-radius: 15px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: opacity 0.2s;
}

.history-tag:hover {
    opacity: 0.8;
}

/* Highlight Effect */
@keyframes highlight {
    0% { transform: scale(1); box-shadow: 0 0 0 rgba(26, 188, 156, 0); }
    50% { transform: scale(1.05); box-shadow: 0 0 20px rgba(26, 188, 156, 0.5); border-color: var(--nav-link-hover); }
    100% { transform: scale(1); box-shadow: 0 0 0 rgba(26, 188, 156, 0); }
}

.highlight-card {
    animation: highlight 1.5s ease-in-out;
    border: 2px solid var(--nav-link-hover);
}

header h1 {
    margin: 0;
    font-size: 2.5rem;
}

nav {
    background-color: var(--nav-bg);
    padding: 0.5rem;
    text-align: center;
}

nav a {
    color: #fff;
    text-decoration: none;
    padding: 0.5rem 1rem;
    margin: 0 0.2rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

nav a:hover, nav a.active {
    background-color: var(--nav-link-hover);
}

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

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 4px 6px var(--card-shadow);
    padding: 1.5rem;
    transition: transform 0.2s, background-color 0.3s;
}

.card:hover {
    transform: var(--card-hover-transform);
}

.card h2 {
    color: var(--card-title);
    margin-top: 0;
    border-bottom: 2px solid var(--card-border);
    padding-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card .tag {
    font-size: 0.8rem;
    background: var(--tag-bg);
    color: var(--tag-text);
    padding: 0.2rem 0.5rem;
    border-radius: 12px;
}

.card p {
    color: var(--desc-text);
    font-size: 0.95rem;
}

.card .features {
    margin-top: 1rem;
    list-style-type: none;
    padding: 0;
}

.card .features li {
    background: var(--feature-bg);
    color: var(--feature-text);
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.85rem;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
}

footer {
    text-align: center;
    padding: 2rem;
    background-color: var(--footer-bg);
    color: var(--footer-text);
    margin-top: 2rem;
}

.stats {
    display: flex;
    justify-content: space-around;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.stat-box {
    background: var(--stat-bg);
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
    min-width: 200px;
    box-shadow: 0 2px 4px var(--card-shadow);
    margin: 10px;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--stat-number);
}

.intro-text {
    font-size: 1.2rem;
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem;
    color: var(--desc-text);
}