/* Algemeen */

body {
    font-family: 'Linux Libertine', 'Georgia', 'Times', serif;
    padding: 0 1.5em 1.5em 1.5em;
    line-height: 1.6;
    margin: 0;
    color: #202122;
    background-color: #ffffff;
}

h1 {
    font-family: 'Linux Libertine', 'Georgia', 'Times', serif;
    margin-bottom: 0.25em;
    padding: 0;
    line-height: 1.3;
    font-size: 1.8em;
    font-weight: normal;
    border-bottom: 1px solid #a2a9b1;
}

/* Header */

.header {
    display: flex;
    align-items: center;
    gap: 0.8em;
    padding: 0.5em 0;
}

.header img {
    height: 2.2em;
    width: auto;
    flex-shrink: 0;
}

.header-content {
    flex: 1;
}

.header h1 {
    font-family: 'Linux Libertine', 'Georgia', 'Times', serif;
    margin: 0;
    padding: 0;
    line-height: 1.2;
    font-size: 1.8em;
    font-weight: normal;
    border-bottom: none;
}

.header p {
    font-family: 'Linux Libertine', 'Georgia', 'Times', serif;
    margin: 0.2em 0 0 0;
    font-size: 92%;
    color: #202122;
}

/* Loading Animation */

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.spinning {
    animation: spin 1.2s linear infinite;
    will-change: transform;
}

/* Controls & Box Layout */

.box {
    font-family: sans-serif;
    font-size: 95%;
    padding: 10px 14px;
    border: 1px solid #a2a9b1;
    background-color: #f8f9fa;
    color: #202122;
}

main > .box:first-child {
    position: sticky;
    top: 7px;
    z-index: 10;
}

.form-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 12px;
}

.form-group {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.form-group input[type="text"],
.form-group select {
    padding: 3px 6px;
    border: 1px solid #a2a9b1;
    border-radius: 2px;
    font-size: 0.95em;
    font-family: sans-serif;
    background-color: #ffffff;
}

#taal {
    min-width: 9em;
}

#start, #einde {
    min-width: 140px;
    flex: 1 1 auto;
}

/* Full-Width Statistics Box at Bottom */

.stats-box {
    margin-top: 1.2em;
}

.stats-box[hidden] {
    display: none !important;
}

.stats-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px 24px;
    font-size: 92%;
}

.stat-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.stat-label {
    color: #54595d;
    font-weight: bold;
}

.stat-val {
    color: #202122;
}

.stats-row button#wisKnop {
    margin-left: auto;
}

/* Warning & Error Banners */

#waarschuwing {
    display: block;
    margin-top: 8px;
    font-size: 90%;
    color: #54595d;
}

#waarschuwing[hidden] {
    display: none !important;
}

#waarschuwing b {
    color: #ba0000;
}

.error-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 8px;
    padding: 8px 12px;
    background-color: #fdf2f2;
    border: 1px solid #d33;
    border-left: 4px solid #ba0000;
    color: #721c24;
    border-radius: 2px;
    font-size: 90%;
    animation: fadeIn 0.2s ease-in-out;
}

.error-banner[hidden] {
    display: none !important;
}

.error-message {
    flex: 1;
    word-break: break-word;
}

.error-dismiss {
    background: none;
    border: none;
    color: #ba0000;
    font-size: 1.3em;
    line-height: 1;
    cursor: pointer;
    padding: 0 4px;
    margin-left: 8px;
}

.error-dismiss:hover {
    color: #000;
    text-decoration: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-3px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Wikipedia Table of Contents (TOC) Style Visualisatie */

#visualisatie {
    margin: 1em 0;
    font-family: sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial;
    font-size: 0.92em;
    line-height: 1.7;
    overflow-x: auto;
    max-width: 100%;
    padding-bottom: 0.5em;
}

#visualisatie ul {
    list-style-type: none;
    padding-left: 1.2em;
    margin: 0.15em 0;
}

ul#wortel {
    padding-left: 0;
    list-style-type: none;
    font-weight: bold;
}

ul#wortel > li > a.wiki-link {
    font-weight: bold;
    color: #202122;
    font-size: 1.05em;
}

#visualisatie li {
    padding: 0.1em 0;
    position: relative;
    white-space: nowrap;
}

/* Clickable Wikipedia Article Links - Wikipedia Blue */
#visualisatie a.wiki-link {
    color: #3366bb;
    text-decoration: none;
    white-space: nowrap;
    transition: color 0.1s, text-decoration 0.1s;
}

#visualisatie a.wiki-link:hover {
    color: #0645ad;
    text-decoration: underline;
}

#visualisatie a.wiki-link:visited {
    color: #0b0080;
}

/* Pixel-Perfect Tree Connector Lines:
   - Primary branch (Branch 1) draws a clean vertical line starting at parent and ending at split point.
   - Secondary branch (Branch 2) draws a horizontal tick starting at x=0 that seamlessly meets the vertical line. */

#visualisatie ul.branch-primary {
    border-left: 2px solid #3366bb;
    padding-left: 1.2em;
    margin-left: 0;
}

#visualisatie ul.branch-split {
    margin-top: 6px;
    padding-left: 1.2em;
    position: relative;
}

#visualisatie ul.branch-split::before {
    content: "";
    position: absolute;
    top: 0.85em;
    left: 0;
    width: 0.85em;
    height: 0;
    border-top: 2px solid #3366bb;
}

/* Collapsible Node Toggle Chevron (Wikipedia Style) */
.toggle-btn {
    display: inline-block;
    cursor: pointer;
    user-select: none;
    font-size: 70%;
    margin-right: 5px;
    color: #72777d;
    transition: transform 0.15s ease;
    width: 0.9em;
    text-align: center;
    vertical-align: middle;
}

.toggle-btn:hover {
    color: #202122;
}

li.collapsed > ul {
    display: none !important;
}

li.collapsed > .toggle-btn {
    transform: rotate(-90deg);
}

/* Loop node marker in tree */

.loop-marker {
    display: inline-block;
    margin-left: 6px;
    padding: 1px 6px;
    font-size: 80%;
    font-family: sans-serif;
    border-radius: 2px;
    background-color: #fcf3cf;
    color: #7d6608;
    border: 1px solid #f9e79f;
    font-weight: normal;
}

/* Footer */

footer {
    text-align: center;
    margin-top: 1.5em;
}

/* Wikipedia Buttons */

button {
    cursor: pointer;
    border: none;
    background: none;
    color: #3366bb;
    font-size: 0.95em;
}

button:disabled {
    color: #72777d;
    cursor: not-allowed;
}

button:not(:disabled):hover {
    text-decoration: underline;
}

#toevoegKnop:before {
    color: #54595d;
    margin-right: 0.25em;
    content: "[";
}

#toevoegKnop:after {
    color: #54595d;
    margin-left: 0.25em;
    content: "]";
}