:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --radius: 12px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    background-color: var(--gray-50);
    color: var(--gray-800);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

nav {
    background: white;
    box-shadow: var(--shadow-sm);
}

.navbar {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--gray-800);
}

.logo svg {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
}

.logo span {
    font-size: 1.25rem;
    font-weight: 600;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--primary);
}

main {
    flex: 1;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.hero {
    text-align: center;
    margin-bottom: 4rem;
    padding: 4rem 1rem;
    background: linear-gradient(to right, #2563eb11, #2563eb22);
    border-radius: var(--radius);
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero p {
    font-size: clamp(1rem, 3vw, 1.25rem);
    color: var(--gray-700);
    max-width: 600px;
    margin: 0 auto;
}

.search-container {
    max-width: 600px;
    margin: 2rem auto;
    padding: 0 1rem;
    position: relative;
}

.search-box {
    width: 100%;
    padding: 1rem 1.5rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: all 0.3s;
}

.search-box:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.info-section {
    padding: 4rem 1rem;
    margin: 2rem auto;
    text-align: center;
    max-width: 1200px;
}

.info-section h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--gray-800);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    padding: 0 1rem;
}

.info-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    transition: all 0.3s;
}

.info-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.info-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--gray-800);
}

.info-card p {
    color: var(--gray-700);
    line-height: 1.6;
}

.country-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    padding: 0 1rem;
    margin: 2rem 0;
}

.country-card {
    background: white;
    padding: 1.5rem;
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--gray-800);
    box-shadow: var(--shadow);
    transition: all 0.3s;
    border: 1px solid var(--gray-200);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s forwards;
}

.country-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.country-card[data-hidden="true"] {
    display: none;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.country-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.flag {
    font-size: 2.5rem;
    filter: drop-shadow(0 1px 1px rgba(0,0,0,0.1));
}

.country-details h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.country-details p {
    color: var(--gray-700);
    font-size: 0.875rem;
}

footer {
    background: white;
    border-top: 1px solid var(--gray-200);
    padding: 2rem 1rem;
    text-align: center;
    margin-top: auto;
}

footer p {
    color: var(--gray-700);
}

@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .search-box {
        font-size: 16px;
    }

    .hero {
        padding: 2rem 1rem;
    }

    .info-section {
        padding: 2rem 1rem;
    }

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

@media (max-width: 480px) {
    .country-grid {
        grid-template-columns: 1fr;
    }
}