:root {
    /* Light Mode Variables */
    --bg-color: #f8f9fa;
    --text-color: #2c3e50;
    --header-bg: #ffffff;
    --card-bg: #ffffff;
    --primary-color: #3498db;
    --accent-color: #e74c3c;
    --border-color: #ddd;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition-speed: 0.3s;
}

[data-theme="dark"] {
    /* Dark Mode Variables */
    --bg-color: #1a1a1a;
    --text-color: #ecf0f1;
    --header-bg: #2c2c2c;
    --card-bg: #2c2c2c;
    --primary-color: #5dade2;
    --accent-color: #ff6b6b;
    --border-color: #444;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* Header */
header {
    background-color: var(--header-bg);
    padding: 1rem 2rem;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    flex-wrap: wrap;
    gap: 10px;
}

h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

.controls {
    display: flex;
    gap: 10px;
}

/* Common Button Styles */
.theme-toggle, .lang-toggle {
    background: none;
    border: 2px solid var(--text-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
    font-size: 0.9rem;
}

.theme-toggle:hover, .lang-toggle:hover {
    background-color: var(--text-color);
    color: var(--bg-color);
}

/* Navigation */
nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 2rem 0;
    padding: 0 1rem;
    flex-wrap: wrap;
}

.nav-btn {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s ease;
    box-shadow: var(--shadow);
}

.nav-btn:hover {
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

.nav-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Main Content */
main {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1rem 3rem;
    min-height: 60vh;
}

.content-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.country-header {
    text-align: center;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 1rem;
}

.country-header h2 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.info-item {
    text-align: center;
}

.info-item h3 {
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.info-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    display: block;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    background-color: var(--header-bg);
    color: var(--text-color);
    font-size: 0.9rem;
    margin-top: auto;
}