:root {
    --bg-color: hsl(0, 0%, 99%);
    --element-color: hsl(0, 100%, 100%);
    --text-color: hsl(200, 15%, 8%);
    --input-color: hsl(0, 0%, 50%);
    --shadow: 0 2px 9px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] {
    --bg-color: hsl(207, 26%, 17%);
    --element-color: hsl(209, 23%, 22%);
    --text-color: hsl(0, 100%, 100%);
    --input-color: hsl(0, 100%, 100%);
    --shadow: 0 2px 9px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Nunito Sans', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: all 0.3s ease;
}

.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: var(--element-color);
    box-shadow: var(--shadow);
    padding: 20px 0;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

h1 {
    font-size: 24px;
    font-weight: 800;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
}

.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 50px 0;
    gap: 20px;
}

.search-container {
    position: relative;
    flex: 1;
    max-width: 480px;
}

.search-container i {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--input-color);
}

#search {
    width: 100%;
    padding: 18px 20px 18px 60px;
    border: none;
    border-radius: 5px;
    background-color: var(--element-color);
    color: var(--text-color);
    box-shadow: var(--shadow);
    font-size: 14px;
}

#search::placeholder {
    color: var(--input-color);
}

.filter-container select {
    padding: 18px 20px;
    border: none;
    border-radius: 5px;
    background-color: var(--element-color);
    color: var(--text-color);
    box-shadow: var(--shadow);
    font-size: 14px;
    cursor: pointer;
    min-width: 200px;
}

.countries-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(264px, 1fr));
    gap: 75px;
    margin-bottom: 50px;
}

.country-card {
    background-color: var(--element-color);
    border-radius: 5px;
    box-shadow: var(--shadow);
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.country-card:hover {
    transform: translateY(-5px);
}

.country-card img {
    width: 100%;
    height: 160px;
    object-fit: cover;
}

.card-content {
    padding: 24px;
}

.card-content h3 {
    font-size: 18px;
    font-weight: 800;
    margin-bottom: 16px;
}

.card-content p {
    font-size: 14px;
    margin-bottom: 4px;
}

.card-content strong {
    font-weight: 600;
}

.country-detail {
    background-color: var(--bg-color);
    min-height: 100vh;
    padding: 50px 0;
}

.back-btn {
    background-color: var(--element-color);
    border: none;
    padding: 10px 30px;
    border-radius: 5px;
    box-shadow: var(--shadow);
    color: var(--text-color);
    font-size: 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 80px;
}

.detail-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 120px;
    align-items: center;
}

.detail-flag img {
    width: 100%;
    max-width: 560px;
    height: auto;
}

.detail-info h2 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 30px;
}

.info-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.info-columns p {
    font-size: 16px;
    margin-bottom: 8px;
}

.info-columns strong {
    font-weight: 600;
}

.border-countries {
    display: flex;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.border-countries strong {
    font-weight: 600;
    font-size: 16px;
}

.border-btn {
    background-color: var(--element-color);
    border: none;
    padding: 5px 20px;
    border-radius: 3px;
    box-shadow: var(--shadow);
    color: var(--text-color);
    font-size: 14px;
    cursor: pointer;
    margin: 5px;
}

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
    
    h1 {
        font-size: 20px;
    }
    
    .controls {
        flex-direction: column;
        align-items: stretch;
        gap: 40px;
        margin: 30px 0;
    }
    
    .search-container {
        max-width: none;
    }
    
    .filter-container select {
        min-width: auto;
    }
    
    .countries-grid {
        grid-template-columns: 1fr;
        gap: 40px;
        justify-items: center;
    }
    
    .country-card {
        max-width: 264px;
        width: 100%;
    }
    
    .detail-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .detail-info h2 {
        font-size: 24px;
    }
    
    .info-columns {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .border-countries {
        flex-direction: column;
        align-items: flex-start;
    }
}