:root {
    --primary-color: #0fa6ab;
    --secondary-color:rgb(12, 138, 143);
    --background-color: #edeef0;
    --text-color: #2c2d2e;
    --border-radius: 4px;
    --box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --header-bg: #ffffff;
    --card-bg: #ffffff;
}

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

body {
    font-family: 'Open Sans', -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.5;
    font-size: 15px;
}

.header {
    background: var(--header-bg);
    box-shadow: var(--box-shadow);
    padding: 1rem 0;
    margin-bottom: 2rem;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 1rem;
}

h1 {
    text-align: center;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    font-size: 1.75rem;
    font-weight: 600;
}

.search-section {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 2rem;
}

.search-bar {
    display: flex;
    gap: 0.75rem;
}

form {
    width: 100%;
}

input,
select {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid #dce1e6;
    border-radius: var(--border-radius);
    font-size: 0.9375rem;
    color: var(--text-color);
    background: #fff;
    transition: border-color 0.2s;
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
}

button {
    padding: 0.625rem 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
    min-width: 100px;
}

button:hover {
    background-color: var(--secondary-color);
}

.categories {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
}

.category-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}

.category-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.category-button {
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 1rem 1.25rem;
    font: inherit;
    font-weight: 600;
}

.items-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.item {
    background: var(--card-bg);
    padding: 1.25rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    line-height: 1.6;
}

.theme-header {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1.125rem;
    margin: 1.5rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid #e7e8ec;
}

@media (max-width: 768px) {
    .search-bar {
        flex-direction: column;
    }

    .container {
        padding: 0 0.75rem;
    }

    button {
        width: 100%;
    }

    .categories {
        grid-template-columns: 1fr;
    }
}