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

body {
    background-color: #f5f5f5;
}

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

header {
    background-color: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

h1 {
    color: #333;
    text-align: center;
    margin-bottom: 20px;
}

.search-container {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

input, select {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
}

#searchInput {
    flex: 1;
    min-width: 0;
}

#letterFilter {
    min-width: 120px;
}

main {
    display: grid;
    grid-template-columns: 1fr 2fr;
    grid-template-areas: "list detail";
    gap: 20px;
}

.word-list {
    grid-area: list;
    background: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    height: 70vh;
    overflow-y: auto;
}

.word-item {
    padding: 10px;
    cursor: pointer;
    border-bottom: 1px solid #eee;
    transition: background-color 0.2s;
}

.word-item:hover {
    background-color: #f0f0f0;
}

.word-item.active {
    background-color: #e3f2fd;
}

.word-detail {
    grid-area: detail;
    background: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.word-detail h2 {
    color: #1976d2;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid #e3f2fd;
}

.word-detail p {
    line-height: 1.6;
    color: #555;
}

@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
        grid-template-areas: 
            "detail"
            "list";
    }
    
    .word-list {
        height: 40vh;
    }

    .search-container {
        flex-direction: column;
    }

    #searchInput,
    #letterFilter {
        width: 100%;
    }
}