:root {
            --rijk-blauw:  #012456;
            --hemel-blauw: #007bc7;
            --licht-grijs: #f3f3f3;
            --wit:         #ffffff;
            --tekst:       #333333;
            --border:      #d2d2d2;
            --accent:      #ffcc00;
            --groen:       #27ae60;
            --groen-licht: #f0fff4;
            --rood:        #d93025;
            --rood-licht:  #fff5f5;
            --header-height: 72px;
            --mobile-bar-height: calc(58px + env(safe-area-inset-bottom, 0px));
        }

        *, *::before, *::after { box-sizing: border-box; }

        html, body {
            height: 100%;
            margin: 0;
            font-family: "RO Sans", Verdana, sans-serif;
            background: var(--licht-grijs);
            color: var(--tekst);
        }

        body { display: flex; flex-direction: column; }

        header {
            flex-shrink: 0;
            background: var(--rijk-blauw);
            color: var(--wit);
            padding: 12px 20px;
            display: flex;
            align-items: center;
            z-index: 100;
        }
        #home-btn {
            margin: 0;
            padding: 0;
            border: none;
            background: none;
            color: var(--wit);
            font-size: 1.1rem;
            font-weight: normal;
            font-family: inherit;
            cursor: pointer;
        }
        #home-btn:hover { text-decoration: underline; }
        .logo-box {
            border-left: 2px solid var(--wit);
            margin-left: 15px;
            padding-left: 15px;
            font-size: 0.8rem;
        }

        #graph-meta {
            margin-left: auto;
            font-size: 0.72rem;
            color: rgba(255,255,255,0.75);
            text-align: right;
            line-height: 1.6;
        }
        #graph-meta strong { color: var(--wit); }


        #nav-knoppen {
            position: absolute;
            top: 12px; right: 12px;
            display: flex;
            flex-direction: column;
            gap: 6px;
            z-index: 10;
        }
        .nav-btn {
            width: 34px; height: 34px;
            background: rgba(255,255,255,0.92);
            border: 1px solid var(--border);
            border-radius: 6px;
            font-size: 1.1rem;
            cursor: pointer;
            display: flex; align-items: center; justify-content: center;
            box-shadow: 0 1px 4px rgba(0,0,0,0.15);
            color: var(--tekst);
        }
        .nav-btn:hover { background: var(--wit); box-shadow: 0 2px 6px rgba(0,0,0,0.2); }
        .nav-btn.active { background: var(--hemel-blauw); border-color: var(--hemel-blauw); color: var(--wit); }

        main { flex: 1; display: flex; overflow: hidden; min-height: 0; }

        #sidebar {
            width: 360px;
            flex-shrink: 0;
            background: var(--wit);
            border-right: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            overflow: hidden;
            transition: transform 0.3s ease;
        }

        #sidebar.collapsed {
            display: none;
        }



        .overlay.active { display: block; }

        .tabs { display: flex; background: var(--rijk-blauw); }
        .tab-btn {
            flex: 1; padding: 12px 8px; border: none; background: none;
            color: white; cursor: pointer; font-size: 0.78rem; opacity: 0.7;
        }
        .tab-btn.active { opacity: 1; background: rgba(255,255,255,0.1); border-bottom: 3px solid var(--accent); }

        .tab-content { flex: 1; padding: 20px; overflow-y: auto; display: none; }
        .tab-content.active { display: block; }
        .tab-content h3:first-child { margin-top: 0; }

        label { display: block; font-size: 0.85rem; font-weight: bold; margin-bottom: 6px; color: var(--rijk-blauw); }
        input[type="date"],
        input[type="number"],
        select {
            display: block;
            width: 100%;
            padding: 10px 12px;
            border: 1px solid var(--border);
            border-radius: 6px;
            font-size: 0.95rem;
            font-family: inherit;
            background: var(--wit);
            color: var(--tekst);
            transition: border-color 0.2s, box-shadow 0.2s;
        }
        select {
            appearance: none;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23012456' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 12px center;
            padding-right: 36px;
            cursor: pointer;
        }
        input:focus, select:focus {
            outline: none;
            border-color: var(--hemel-blauw);
            box-shadow: 0 0 0 3px rgba(0, 123, 199, 0.2);
        }
        input[type="range"] {
            display: block;
            width: 100%;
            margin: 10px 0;
            cursor: pointer;
        }
        input[type="date"] { text-align: left; }
        .field { margin-bottom: 18px; }

        .btn {
            cursor: pointer;
            padding: 12px 16px;
            font-weight: bold;
            border: 2px solid transparent;
            border-radius: 6px;
            width: 100%;
            margin-bottom: 8px;
            font-size: 0.95rem;
            font-family: inherit;
            transition: background 0.2s, color 0.2s, border-color 0.2s, box-shadow 0.2s;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        .btn-primary {
            background: var(--hemel-blauw);
            color: white;
        }
        .btn-primary:hover {
            background: var(--rijk-blauw);
        }
        .btn-primary:focus {
            box-shadow: 0 0 0 3px rgba(0, 123, 199, 0.4);
            outline: none;
        }
        .btn-secondary {
            background: white;
            color: var(--hemel-blauw);
            border-color: var(--hemel-blauw);
        }
        .btn-secondary:hover {
            background: #f0f7ff;
            border-color: var(--rijk-blauw);
            color: var(--rijk-blauw);
        }
        .btn-secondary:focus {
            box-shadow: 0 0 0 3px rgba(0, 123, 199, 0.2);
            outline: none;
        }
        .btn-row { display: flex; gap: 10px; margin-top: 20px; }
        .btn-row .btn { width: auto; flex: 1; margin-bottom: 0; }
        .btn--small { font-size: 0.8rem; padding: 8px 12px; }

        .toggle-control {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 14px;
            border: 1px solid var(--border);
            border-radius: 6px;
            background: #f8fbff;
            transition: background 0.2s;
        }
        .toggle-control:hover {
            background: #f0f6ff;
        }
        .toggle-control__text {
            font-size: 0.9rem;
            font-weight: bold;
            color: var(--rijk-blauw);
        }
        .toggle-switch {
            position: relative;
            display: inline-flex;
            align-items: center;
            width: 52px;
            height: 30px;
        }
        .toggle-switch input {
            position: absolute;
            opacity: 0;
            inset: 0;
            cursor: pointer;
        }
        .toggle-slider {
            width: 100%;
            height: 100%;
            border-radius: 999px;
            background: #b8c7d9;
            transition: background 0.2s ease;
            position: relative;
        }
        .toggle-slider::after {
            content: "";
            position: absolute;
            top: 3px;
            left: 3px;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: white;
            box-shadow: 0 1px 4px rgba(0,0,0,0.2);
            transition: transform 0.2s ease;
        }
        .toggle-switch input:checked + .toggle-slider {
            background: var(--hemel-blauw);
        }
        .toggle-switch input:checked + .toggle-slider::after {
            transform: translateX(22px);
        }
        .notitie-github {
            background: #f0f6ff;
            border: 1px solid #a8c4e8;
            border-left: 4px solid #3a7fc1;
            border-radius: 4px;
            padding: 8px 10px;
            margin-top: 6px;
            font-size: 0.78rem;
            color: #1a3a5c;
            line-height: 1.4;
        }
        .notitie-github a {
            color: #1a3a5c;
            font-weight: bold;
        }
        .notitie-ontbrekend {
            background: #fffbe6;
            border: 1px solid #e6c619;
            border-left: 4px solid #e6c619;
            border-radius: 4px;
            padding: 8px 10px;
            margin-top: 8px;
            font-size: 0.78rem;
            color: #5a4a00;
            line-height: 1.4;
        }

        #result-panel { padding: 15px; border: 2px solid var(--border); margin-top: 15px; display: none; }
        .invorderbaar      { border-color: var(--groen); background: var(--groen-licht); }
        .niet-invorderbaar { border-color: var(--rood);  background: var(--rood-licht);  }
        #status-header { font-weight: bold; font-size: 1rem; }
        #deadline-info { margin-top: 4px; }
        #meta-info     { font-size: 0.75rem; margin-top: 8px; color: #555; }

        #termijnen-tabel { width: 100%; border-collapse: collapse; margin-top: 10px; font-size: 0.8rem; }
        #termijnen-tabel th { background: #f0f0f0; padding: 4px 8px; text-align: left; border-bottom: 2px solid var(--border); }
        #termijnen-tabel td { padding: 4px 8px; border-bottom: 1px solid #eee; }
        .termijn-vervallen td { color: #2d6a0f; }
        .termijn-toekomst td { color: #555; }
        .checkbox-label {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.85rem;
            cursor: pointer;
            margin: 10px 0;
            line-height: 1.4;
            color: var(--tekst);
            padding: 4px 0;
        }
        .checkbox-label input[type="checkbox"] {
            appearance: none;
            width: 20px;
            height: 20px;
            border: 2px solid var(--border);
            border-radius: 4px;
            background: var(--wit);
            cursor: pointer;
            position: relative;
            transition: background 0.2s, border-color 0.2s;
            flex-shrink: 0;
            margin: 0;
        }
        .checkbox-label input[type="checkbox"]:checked {
            background: var(--hemel-blauw);
            border-color: var(--hemel-blauw);
        }
        .checkbox-label input[type="checkbox"]:checked::after {
            content: "";
            position: absolute;
            left: 6px;
            top: 2px;
            width: 5px;
            height: 10px;
            border: solid white;
            border-width: 0 2px 2px 0;
            transform: rotate(45deg);
        }
        .checkbox-label input[type="checkbox"]:focus {
            outline: none;
            box-shadow: 0 0 0 3px rgba(0, 123, 199, 0.2);
        }
        #lid5-veld { margin: 8px 0; padding: 8px 10px; background: #f7f7ff; border-left: 3px solid #7030A0; font-size: 0.82rem; }

        .detail-row   { margin-bottom: 10px; border-bottom: 1px solid #eee; padding-bottom: 5px; }
        .detail-label { font-weight: bold; font-size: 0.7rem; color: #777; text-transform: uppercase; }
        .detail-value { font-size: 0.85rem; word-break: break-word; overflow-wrap: break-word; white-space: normal; max-width: 100%; }
        .detail-hint  { font-size: 0.85rem; color: #999; padding: 8px 0; font-style: italic; }

        #graph-container { flex: 1; position: relative; background: white; min-width: 0; }
        #mynetwork { position: absolute; inset: 0; }
        #graph-container:fullscreen {
            width: 100vw;
            height: 100vh;
            max-width: none;
            max-height: none;
            background: var(--wit);
        }
        #graph-container:fullscreen #mynetwork {
            position: absolute;
            inset: 0;
        }
        #graph-container:fullscreen #nav-knoppen {
            top: 16px;
            right: 16px;
            z-index: 30;
        }
        /* Fallback for pseudo-fullscreen */
        .pseudo-fullscreen {
            position: fixed !important;
            inset: 0 !important;
            z-index: 9999 !important;
            width: 100vw !important;
            height: 100vh !important;
            background: white !important;
        }

        /* Legend Styles */
        .legend-item { display: flex; align-items: center; margin-bottom: 8px; }
        .dot { width: 12px; height: 12px; border-radius: 50%; margin-right: 10px; flex-shrink: 0; }
        .dot--actief { border: 2px solid var(--hemel-blauw); background: transparent; }
        .legend-divider { border-top: 1px solid #eee; margin: 10px 0; }
        .mobile-only-inline { display: none; }
        .desktop-only-inline { display: inline; }
        .legend-meta { font-size: 0.8rem; line-height: 1.6; color: #555; }

        .overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.4);
            z-index: 150;
        }
        .overlay.active { display: block; }

        #mobile-bottom-bar {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            min-height: 58px;
            padding-bottom: env(safe-area-inset-bottom, 0px);
            background: var(--rijk-blauw);
            z-index: 1000;
            align-items: stretch;
            justify-content: center;
            box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
            -webkit-transform: translateZ(0);
            transform: translateZ(0);
        }

        .mobile-bar-btn {
            flex: 1;
            background: none;
            color: white;
            border: none;
            padding: 8px 6px;
            border-radius: 0;
            font-weight: normal;
            font-size: 0.72rem;
            cursor: pointer;
            opacity: 0.8;
            letter-spacing: 0.02em;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            line-height: 1.2;
            border-bottom: 3px solid transparent;
        }

        .mobile-bar-btn.active {
            opacity: 1;
            background: rgba(255,255,255,0.1);
            border-bottom: 3px solid var(--accent);
        }

        #loader {
            position: absolute; inset: 0; display: flex;
            align-items: center; justify-content: center;
            background: white; z-index: 20; font-size: 0.9rem; color: #666;
        }

        #node-tooltip {
            display: none;
            position: fixed;
            max-width: 280px;
            background: rgba(30, 30, 30, 0.92);
            color: #fff;
            padding: 8px 12px;
            border-radius: 6px;
            font-size: 13px;
            line-height: 1.5;
            white-space: normal;
            word-wrap: break-word;
            overflow-wrap: break-word;
            z-index: 9999;
            pointer-events: none;
            box-shadow: 0 2px 8px rgba(0,0,0,0.3);
        }

        @media (max-width: 850px) {
            html, body { height: auto; overflow-x: hidden; }
            main { flex-direction: column; overflow: visible; }
            #sidebar {
                width: 100%;
                height: 0;
                min-height: 0;
                flex-shrink: 0;
                border: none;
                overflow: visible;
                max-height: 0;
                position: relative;
                top: auto;
                left: auto;
                right: auto;
                background: transparent;
                z-index: auto;
                transform: none;
                transition: none;
                display: block;
            }
            .tabs { display: none; }
            .tab-content,
            .tab-content.active { overflow: visible; }
            .tab-content,
            .tab-content.active {
                display: block;
                position: fixed;
                left: 0;
                right: 0;
                top: auto;
                bottom: calc(-100dvh - var(--mobile-bar-height));
                width: 100%;
                max-height: calc(100dvh - var(--header-height) - var(--mobile-bar-height));
                padding: 20px 18px calc(20px + env(safe-area-inset-bottom, 0px));
                border: 1px solid var(--border);
                border-bottom: none;
                border-radius: 12px 12px 0 0;
                background: var(--wit);
                box-shadow: 0 -8px 24px rgba(0,0,0,0.18);
                overflow-y: auto;
                visibility: hidden;
                pointer-events: none;
                z-index: 2000;
                transition: bottom 0.3s ease, visibility 0.3s ease;
            }
            .tab-content::before {
                content: "";
                display: block;
                width: 52px;
                height: 5px;
                margin: 0 auto 16px;
                border-radius: 999px;
                background: #c8d2de;
            }
            .tab-content h3 {
                margin-bottom: 16px;
                padding-bottom: 10px;
                border-bottom: 1px solid #dfe7f0;
                color: var(--rijk-blauw);
                font-size: 1rem;
                letter-spacing: 0.02em;
            }
            .tab-content .btn,
            .tab-content select,
            .tab-content input[type="date"],
            .tab-content input[type="number"],
            .tab-content input[type="range"],
            .tab-content #result-panel,
            .tab-content .notitie-github,
            .tab-content .notitie-ontbrekend {
                border-radius: 6px;
            }
            .tab-content .btn {
                min-height: 46px;
            }
            .tab-content .btn-row {
                flex-direction: column;
            }
            .tab-content .btn-row .btn {
                width: 100%;
            }
            .tab-content .field,
            .tab-content #result-panel,
            .tab-content .notitie-github,
            .tab-content .notitie-ontbrekend {
                margin-bottom: 14px;
            }
            .tab-content .detail-row {
                padding: 10px 0 8px;
            }
            input[type="date"] { max-width: -webkit-fill-available; }
            main {
                min-height: calc(100dvh - var(--header-height) - var(--mobile-bar-height));
            }
            #graph-container {
                flex: 1 1 auto;
                height: calc(100dvh - var(--header-height) - var(--mobile-bar-height));
                min-height: calc(100dvh - var(--header-height) - var(--mobile-bar-height));
                width: 100%;
                margin-top: 0;
                position: relative;
                z-index: 1;
                overflow: hidden;
            }
            .tab-content.mobile-popup-open {
                bottom: var(--mobile-bar-height);
                visibility: visible;
                pointer-events: auto;
            }

            #mobile-bottom-bar { display: flex; }
            #graph-meta { display: none; }
            #nav-knoppen {
                display: flex;
                top: 12px;
                right: 12px;
            }
            .mobile-only-inline { display: inline; }
            .desktop-only-inline { display: none; }
            body { padding-bottom: var(--mobile-bar-height); }
        }