:root {
    --accent-color: #1d7a8c;
    --background-color: #0f172a;
    --text-color: #f8fafc;
    --control-background: rgba(15, 23, 42, 0.92);
    --control-border: rgba(148, 163, 184, 0.35);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: var(--background-color);
    color: var(--text-color);
}

#map {
    width: 100vw;
    height: 100vh;
}

.filter-control {
    background: var(--control-background);
    border: 1px solid var(--control-border);
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.45);
    padding: 0.85rem 1rem;
    width: 240px;
    max-height: calc(100vh - 2rem);
    overflow-y: auto;
    color: var(--text-color);
    backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
}

.filter-control.collapsed {
    overflow: visible;
}

.filter-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

.filter-control h2 {
    margin: 0;
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #e2e8f0;
}

.filter-toggle {
    width: 2rem;
    height: 2rem;
    border-radius: 999px;
    border: 1px solid rgba(148, 163, 184, 0.45);
    background: rgba(15, 23, 42, 0.55);
    color: var(--text-color);
    display: grid;
    place-items: center;
    cursor: pointer;
    font-size: 1.1rem;
    line-height: 1;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.filter-toggle:hover,
.filter-toggle:focus-visible {
    background: rgba(29, 122, 140, 0.45);
    border-color: var(--accent-color);
    color: #f8fafc;
}

.filter-toggle:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.filter-body {
    overflow: hidden;
    transition: height 0.3s ease, opacity 0.3s ease;
    margin-top: 0.85rem;
}

.filter-control.collapsed .filter-body {
    margin-top: 0.5rem;
}

.filter-group + .filter-group {
    margin-top: 1.1rem;
}

.filter-group h3 {
    margin: 0 0 0.5rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: #cbd5f5;
}

.filter-actions {
    display: flex;
    gap: 0.5rem;
    margin: 0.65rem 0 0.35rem;
}

.filter-actions button {
    flex: 1;
    border: 1px solid rgba(29, 122, 140, 0.55);
    background: rgba(29, 122, 140, 0.18);
    color: #e2e8f0;
    border-radius: 6px;
    font-size: 0.72rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    padding: 0.3rem 0.35rem;
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.filter-actions button:hover,
.filter-actions button:focus-visible {
    background: rgba(29, 122, 140, 0.35);
    border-color: var(--accent-color);
    color: #f8fafc;
}

.filter-actions button:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.filter-option {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.35rem 0;
    font-size: 0.85rem;
    cursor: pointer;
}

.filter-option input[type="checkbox"] {
    appearance: none;
    width: 18px;
    height: 18px;
    border: 2px solid var(--accent-color);
    border-radius: 4px;
    display: grid;
    place-content: center;
    transition: background-color 0.2s ease, border-color 0.2s ease;
    background: transparent;
}

.filter-option input[type="checkbox"]::after {
    content: "";
    width: 10px;
    height: 6px;
    border-left: 2px solid transparent;
    border-bottom: 2px solid transparent;
    transform: rotate(-45deg);
    transition: border-color 0.2s ease;
}

.filter-option input[type="checkbox"]:checked {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.filter-option input[type="checkbox"]:checked::after {
    border-left-color: white;
    border-bottom-color: white;
}

.filter-option span {
    flex: 1;
}

.leaflet-popup-content {
    font-size: 0.95rem;
    color: #0f172a;
    width: min(640px, calc(95vw - 2rem));
}

.leaflet-popup-content .popup-content {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    color: #0f172a;
}

.leaflet-popup-content h3 {
    margin: 0;
    font-size: 1.1rem;
    color: var(--accent-color);
}

.popup-header {
    display: flex;
    align-items: center;
}

.popup-details {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    margin: 0;
}

.popup-row {
    display: grid;
    grid-template-columns: minmax(0, 9rem) minmax(0, 1fr);
    gap: 0.65rem;
    align-items: start;
}

.popup-row dt {
    margin: 0;
    font-weight: 600;
    color: #1e293b;
}

.popup-row dd {
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    color: #0f172a;
    overflow-wrap: anywhere;
}

.popup-primary {
    font-weight: 600;
}

.popup-pupil-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.popup-pupil-section h4 {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: #1e293b;
}

.popup-pupil-table {
    width: 100%;
    border-collapse: collapse;
}

.popup-pupil-table th,
.popup-pupil-table td {
    padding: 0.45rem 0.35rem;
    border-bottom: 1px solid rgba(148, 163, 184, 0.28);
}

.popup-pupil-table th + th,
.popup-pupil-table td + td {
    border-left: 1px solid rgba(148, 163, 184, 0.4);
}

.popup-pupil-table th:first-child,
.popup-pupil-table td:first-child {
    text-align: left;
}

.popup-pupil-table th:last-child,
.popup-pupil-table td:last-child {
    text-align: right;
}

.popup-pupil-table thead th {
    font-weight: 600;
    color: #1e293b;
}

.popup-pupil-table tbody td {
    color: #0f172a;
}

.popup-pupil-table tbody tr:last-child td {
    border-bottom: 0;
}

.popup-contact-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    font-size: 0.9rem;
}

.popup-website-link {
    color: var(--accent-color);
    font-weight: 600;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
    overflow-wrap: anywhere;
}

.popup-website-link:hover,
.popup-website-link:focus-visible {
    border-color: var(--accent-color);
}

.popup-contact-list a {
    color: #004799;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
    overflow-wrap: anywhere;
}

.popup-contact-list a:hover,
.popup-contact-list a:focus-visible {
    border-color: var(--accent-color);
}

.popup-contact-label {
    font-weight: 600;
    color: #1e293b;
    margin-right: 0.25rem;
}

.error-message {
    position: absolute;
    top: 1rem;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(15, 23, 42, 0.95);
    color: var(--text-color);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    border: 1px solid rgba(148, 163, 184, 0.3);
    box-shadow: 0 6px 18px rgba(15, 23, 42, 0.45);
    z-index: 1200;
    max-width: 320px;
    text-align: center;
}

@media (max-width: 600px) {
    .filter-control {
        width: min(85vw, 260px);
        max-height: calc(100vh - 1.5rem);
    }
}