:root {
    --background-color: #f3f4f6;
    --text-color: #111827;
    --elements-color: #ffffff;
    --shadow-color: rgba(17, 24, 39, 0.05); 
    --hover-shadow: rgba(17, 24, 39, 0.12);
    --input-placeholder: #9ca3af;
    --transition-speed: 0.3s;
}

body.dark {
    --background-color: #0f172a;
    --text-color: #f8fafc;
    --elements-color: #1e293b;
    --shadow-color: rgba(0, 0, 0, 0.25);
    --hover-shadow: rgba(0, 0, 0, 0.45);
    --input-placeholder: #94a3b8;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Nunito', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
    overflow-x: hidden;
    word-break: break-word;
}

main {
    padding: 32px 24px;
}

a {
    text-decoration-line: none;
    color: inherit;
}

.header-container {
    box-shadow: 0 4px 12px var(--shadow-color);
    padding-inline: 24px;
    background-color: var(--elements-color);
    transition: background-color var(--transition-speed) ease;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin-inline: auto;
    padding-block: 20px;
}

.title {
    font-weight: 800;
    margin: 0;
    font-size: 1.5rem;
    letter-spacing: -0.5px;
}

.theme-changer {
    cursor: pointer;
    font-weight: 600;
    user-select: none;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 8px;
    transition: background-color 0.2s ease;
}

.theme-changer:hover {
    background-color: rgba(128, 128, 128, 0.1);
}

.search-filter-container {
    max-width: 1200px;
    margin-inline: auto;
    margin-bottom: 48px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
}

.search-container {
    box-shadow: 0 4px 12px var(--shadow-color);
    max-width: 400px;
    width: 100%;
    border-radius: 8px;
    padding-left: 24px;
    background-color: var(--elements-color);
    color: var(--text-color);
    display: flex;
    align-items: center;
    transition: box-shadow 0.2s ease, background-color var(--transition-speed) ease;
}

.search-container:focus-within {
    box-shadow: 0 0 0 2px #3b82f6, 0 4px 12px var(--hover-shadow);
}

.search-container i {
    color: var(--input-placeholder);
}

.search-container input {
    border: none;
    outline: none;
    padding: 16px;
    width: 100%;
    background-color: transparent;
    color: inherit;
    font-family: inherit;
    font-size: 15px;
}

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

.filter-by-region {
    width: 200px;
    max-width: 100%;
    padding: 16px;
    border: none;
    outline: none;
    box-shadow: 0 4px 12px var(--shadow-color);
    border-radius: 8px;
    background-color: var(--elements-color);
    color: var(--text-color);
    font-family: inherit;
    font-size: 15px;
    cursor: pointer;
    transition: box-shadow 0.2s ease, background-color var(--transition-speed) ease;
    appearance: none;
    background-image: url('data:image/svg+xml;utf8,<svg fill="currentColor" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M7 10l5 5 5-5z"/><path d="M0 0h24v24H0z" fill="none"/></svg>');
    background-repeat: no-repeat;
    background-position-x: 95%;
    background-position-y: 50%;
}
.filter-by-region:focus {
     box-shadow: 0 0 0 2px #3b82f6, 0 4px 12px var(--hover-shadow);
}

body.dark .filter-by-region {
    background-image: url('data:image/svg+xml;utf8,<svg fill="%23f3f4f6" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M7 10l5 5 5-5z"/><path d="M0 0h24v24H0z" fill="none"/></svg>');
}

.countries-container {
    max-width: 1200px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(260px, 100%), 1fr));
    gap: 48px;
    margin-inline: auto;
}

.country-card {
    display: flex;
    flex-direction: column;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease, background-color var(--transition-speed) ease;
    background-color: var(--elements-color);
    height: 100%;
}

.country-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px var(--hover-shadow);
}

.card-title {
    font-size: 20px;
    margin-block: 0 20px;
    font-weight: 800;
}

.card-text {
    padding: 24px;
    flex-grow: 1;
}

.card-text p {
    margin-block: 8px;
    font-size: 15px;
    font-weight: 600;
}

.card-text p b {
    font-weight: 600;
    color: var(--text-color);
    opacity: 0.8;
}

.country-card img {
    width: 100%;
    height: 160px;
    object-fit: cover;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

body.dark .country-card img {
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.countries-container > p {
    grid-column: 1 / -1;
    text-align: center;
    font-size: 18px;
    font-weight: 600;
    opacity: 0.7;
    padding: 40px;
}

@media(max-width: 768px) {
    .header-content {
        padding-block: 16px;
    }
    .title {
        font-size: 1.25rem;
    }
    .theme-changer {
        font-size: 14px;
    }
    .search-filter-container {
        flex-direction: column;
        align-items: stretch;
        gap: 32px;
    }
    .search-container, .filter-by-region {
        max-width: 100%;
        width: 100%;
    }
    .countries-container {
        gap: 32px;
        padding-inline: 0px;
    }
}