/* Base styling */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f7f9fc;
    color: #222;
}

/* Layout refinements */
.card {
    background-color: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.06);
    padding: 1.5rem;
}

.sources ul {
    padding-left: 1.2rem;
}
.sources li {
    margin-bottom: 0.5rem;
}

header {
    background: linear-gradient(90deg, #234e70, #3b82f6);
    color: #fff;
    padding: 1.5rem 1rem;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
header h1 {
    margin: 0;
    font-size: 2.2rem;
}
nav {
    margin-top: 0.5rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}
nav a {
    color: #fff;
    text-decoration: none;
    margin: 0.2rem 0.6rem;
    font-weight: 600;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    transition: background-color 0.2s;
}
nav a:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

main {
    padding: 1.5rem;
    max-width: 1000px;
    margin: auto;
}

.section {
    margin-bottom: 2.5rem;
}
.section h2 {
    border-bottom: 2px solid #234e70;
    padding-bottom: 0.4rem;
    margin-bottom: 1rem;
    color: #234e70;
}

.table-container {
    overflow-x: auto;
    margin-bottom: 1rem;
}
table {
    border-collapse: collapse;
    width: 100%;
    margin-top: 0.5rem;
}
table th, table td {
    border: 1px solid #ccc;
    padding: 0.5rem;
    text-align: left;
}
table th {
    background-color: #f0f5fa;
    font-weight: bold;
}

input[type="text"], input[type="number"], select {
    padding: 0.4rem;
    margin-right: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 0.9rem;
}

button {
    padding: 0.5rem 1rem;
    background-color: #2563eb;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s;
}
button:hover {
    background-color: #1d4ed8;
}

.note {
    font-size: 0.85rem;
    color: #444;
    margin-top: 0.5rem;
}

.tool {
    margin-bottom: 1.5rem;
    padding: 1rem;
    border: 1px solid #ddd;
    background-color: #fff;
    border-radius: 4px;
}

/* Adjust input width for level helper */
.tool input[type="number"] {
    width: 160px;
}

.output {
    margin-top: 0.5rem;
    padding: 0.5rem;
    background-color: #eef3f8;
    border: 1px solid #d0d8e0;
    border-radius: 4px;
}

footer {
    background-color: #234e70;
    color: #fff;
    padding: 1rem;
    text-align: center;
    font-size: 0.8rem;
}

/* ---------- Leveling Page Enhancements ---------- */

.level-finder {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 1rem;
    align-items: start;
}

.lf-controls label {
    display: block;
    margin-bottom: 0.25rem;
}

.lf-radio {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin: 0.5rem 0 0.75rem;
}

.lf-output {
    width: 100%;
}

.small {
    font-size: 0.9rem;
    opacity: 0.9;
}

.muted {
    color: #c0c0c0;
}

.tabs .tab-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.tab-button.active {
    outline: 2px solid #ffcc66;
    outline-offset: 2px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

details.bracket {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: 0.5rem 0.75rem;
    margin: 0.5rem 0;
}

details.bracket summary {
    cursor: pointer;
    user-select: none;
    list-style: none;
}

details.bracket summary::-webkit-details-marker {
    display: none;
}

details.bracket summary::before {
    content: "▶";
    display: inline-block;
    margin-right: 0.5rem;
    transform-origin: center;
    transition: transform 0.15s ease;
}

details.bracket[open] summary::before {
    transform: rotate(90deg);
}

.bracket-body {
    margin-top: 0.5rem;
}

@media (max-width: 820px) {
    .level-finder {
        grid-template-columns: 1fr;
    }
}