:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --accent-color: #4cc9f0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --error-color: #f44336;
    --border-radius: 12px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f7ff;
    color: var(--dark-color);
    line-height: 1.6;
}

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

header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
    font-weight: 700;
}

.subtitle {
    color: #666;
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.search-container {
    display: flex;
    margin-bottom: 2rem;
    position: relative;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.search-input {
    flex: 1;
    padding: 1rem 1.5rem;
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    outline: none;
}

.search-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

.search-btn {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #666;
    cursor: pointer;
    font-size: 1.2rem;
}

.category-tabs {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.category-tab {
    padding: 0.5rem 1rem;
    background-color: white;
    border: 1px solid #ddd;
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.category-tab:hover, .category-tab.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.emoji-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.emoji-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 1.5rem 1rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--box-shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
}

.emoji-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}

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

.emoji-name {
    font-size: 0.8rem;
    color: #666;
    word-break: break-word;
}

.notification {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--dark-color);
    color: white;
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    opacity: 0;
    transition: var(--transition);
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.notification.show {
    opacity: 1;
}

.recently-used {
    margin-bottom: 2rem;
}

.section-title {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.empty-state {
    text-align: center;
    padding: 2rem;
    color: #666;
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #ddd;
}

footer {
    text-align: center;
    margin-top: 3rem;
    color: #666;
    font-size: 0.9rem;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--light-color);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--box-shadow);
    z-index: 100;
}

@media (max-width: 768px) {
    .emoji-grid {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    }
    
    h1 {
        font-size: 2rem;
    }
}

/* Dark theme */
body.dark-theme {
    background-color: #121212;
    color: #e0e0e0;
}

body.dark-theme .emoji-card,
body.dark-theme .category-tab {
    background-color: #1e1e1e;
    border-color: #333;
}

body.dark-theme .emoji-name {
    color: #aaa;
}

body.dark-theme .subtitle,
body.dark-theme .empty-state {
    color: #aaa;
}

body.dark-theme .search-input {
    background-color: #1e1e1e;
    border-color: #333;
    color: #e0e0e0;
}

body.dark-theme .search-input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(76, 201, 240, 0.2);
}

body.dark-theme footer {
    color: #aaa;
}