/* Green & White Theme - consolidated and cleaned */
body {
    font-family: 'Inter', sans-serif;
    background-color: #eafaf1; /* soft green background */
    color: #0f172a; /* dark slate text */
    margin: 0;
}

/* Ensure the main container takes full viewport height for centering */
#app { min-height: 100vh; display:flex; align-items:center; justify-content:center; padding:2rem; }

/* White card container (main content) */
#main-content, .max-w-4xl {
    background: #ffffff;
    color: #0f172a;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(2,6,23,0.08);
    border: 1px solid rgba(15,23,42,0.04);
}

/* Header style (CDCFIB green) */
.site-header {
    display: inline-block;
    background: #007a3d; /* CDCFIB-style green (adjust if you have an exact hex) */
    color: #ffffff;
    padding: 0.5rem 1rem;
    border-radius: 8px;
}

/* Ensure header is centered on the start screen */
#start-screen { text-align: center; }

/* Style for selected options (user's temporary selection) */
.option-selected {
    background-color: #16a34a !important; /* green-600 */
    color: white !important;
    border-color: #15803d !important; /* green-700 */
    transform: scale(1.02);
    box-shadow: 0 6px 16px rgba(6,95,70,0.12);
}

/* Style for correct answers in review mode */
.option-correct {
    background-color: #10b981 !important; /* Emerald-500 (Green) */
    color: white !important;
    border-color: #059669 !important; /* Emerald-600 */
    font-weight: 600; /* Semi-bold */
}

/* Style for incorrect answers in review mode (user's wrong choice) */
.option-incorrect {
    background-color: #ef4444 !important; /* Red-500 */
    color: white !important;
    border-color: #dc2626 !important; /* Red-600 */
    font-weight: 600; /* Semi-bold */
}

/* Primary button styling */
.bg-blue-600, .bg-green-600, button.primary, #start-button {
    background: linear-gradient(180deg,#16a34a,#15803d);
    color: #fff;
    border: none;
}

button {
    transition: background-color 0.15s, box-shadow 0.15s, transform 0.15s;
}
button:hover:not(:disabled) {
    box-shadow: 0 10px 20px rgba(2,6,23,0.08);
    transform: translateY(-2px);
}

/* Style for the grid to ensure mobile responsiveness */
#navigation-grid {
    grid-template-columns: repeat(auto-fit, minmax(32px, 1fr));
}

/* Footer styles */
footer {
    margin-top: 1rem;
    text-align: center;
    color: #064e3b;
}
footer a { color: #065f46; text-decoration: none; }
footer a:hover { text-decoration: underline; }

/* Make footer visible and fixed at the bottom so it isn't hidden by layout */
footer {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    background: #ffffff; /* white bar */
    border-top: 1px solid rgba(6,95,70,0.06);
    padding: 0.5rem 0;
    z-index: 2000;
}

/* Prevent the fixed footer from covering content: add bottom padding to main app */
#app { padding-bottom: 3rem; }