:root {
    --primary-color: #3498db;
    --secondary-color: #2980b9;
    --background-color: #f8f9fa;
    --card-color: #ffffff;
    --text-color: #333333;
    --border-color: #e0e0e0;
    --hover-color: #f1f1f1;
    --char-size: 32px;
    --grid-size: 60px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

h1 {
    font-size: 2rem;
    color: var(--primary-color);
}

.language-selector {
    display: flex;
    gap: 10px;
}

.language-selector button {
    background-color: var(--card-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 5px 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.language-selector button.active {
    background-color: var(--primary-color);
    color: white;
}

.search-container {
    position: relative;
    margin-bottom: 20px;
}

#search-input {
    width: 100%;
    padding: 12px 40px 12px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

#clear-search {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: #999;
}

.tabs-container {
    background-color: var(--card-color);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    margin-bottom: 20px;
}

.tabs {
    display: flex;
    overflow-x: auto;
    background-color: var(--card-color);
    border-bottom: 1px solid var(--border-color);
}

.tab {
    padding: 12px 20px;
    cursor: pointer;
    white-space: nowrap;
    transition: background-color 0.3s ease;
}

.tab:hover {
    background-color: var(--hover-color);
}

.tab.active {
    border-bottom: 3px solid var(--primary-color);
    color: var(--primary-color);
    font-weight: bold;
}

.tab-content {
    padding: 20px;
    max-height: 60vh;
    overflow-y: auto;
}

.char-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(var(--grid-size), 1fr));
    gap: 10px;
}

.char-item {
    display: flex;
    justify-content: center;
    align-items: center;
    height: var(--grid-size);
    background-color: var(--card-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: var(--char-size);
    user-select: none;
}

.char-item:hover {
    background-color: var(--hover-color);
    transform: scale(1.05);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.notification {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 10px 20px;
    border-radius: 4px;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1000;
}

.notification.show {
    opacity: 1;
}

.recently-used {
    background-color: var(--card-color);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    padding: 20px;
    margin-bottom: 20px;
}

.recently-used h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

footer {
    text-align: center;
    margin-top: 20px;
    color: #666;
}

.controls {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 15px;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

input[type="range"] {
    width: 150px;
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header {
        flex-direction: column;
        gap: 10px;
    }
    
    .controls {
        flex-direction: column;
        gap: 15px;
    }
}

/* Scrollbar styles */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #aaa;
}