/* CSS styling for Efelyra Studio / QUIZ BRAIN BATTLE */
:root {
    --bg-color: #FAFAFA; /* Warm ivory/white */
    --text-color: #0A192F; /* Deep navy */
    --accent-primary: #10B981; /* Restrained emerald */
    --accent-secondary: #D4AF37; /* Subtle gold */
    --font-family: system-ui, -apple-system, sans-serif;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    line-height: 1.6;
}

header {
    background-color: var(--text-color);
    color: var(--bg-color);
    padding: 1rem 0;
    text-align: center;
    border-bottom: 4px solid var(--accent-primary);
}

header h1 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
}

header nav {
    margin-top: 1rem;
}

header nav a {
    color: var(--bg-color);
    text-decoration: none;
    margin: 0 1rem;
    font-size: 0.9rem;
    transition: color 0.2s;
}

header nav a:hover {
    color: var(--accent-secondary);
}

main {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

h1, h2, h3 {
    color: var(--text-color);
}

h2 {
    border-bottom: 2px solid var(--accent-primary);
    padding-bottom: 0.5rem;
    margin-top: 2rem;
}

a {
    color: var(--accent-primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

footer {
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
    font-size: 0.85rem;
    color: #555;
    border-top: 1px solid #E5E7EB;
}

.card {
    background: #FFF;
    border: 1px solid #E5E7EB;
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--accent-primary);
    color: #FFF;
    border-radius: 6px;
    font-weight: 600;
    transition: background-color 0.2s;
}

.button:hover {
    background-color: #059669;
    text-decoration: none;
}