/* --- Global Styles & Fonts --- */
:root {
    --primary-bg: #1a1a1a;
    --panel-bg: #2c2c2c;
    --text-color: #e0e0e0;
    --primary-accent: #00aaff;
    --border-color: #444444;
    --muted-color: #888888;
    --shadow: 0 2px 8px rgba(0,0,0,0.2);
    --context-accent: #f5a623;
    --context-fill: rgba(245, 166, 35, 0.2);
}

/* Day mode palette; toggled via the ☀️/🌙 button and saved in localStorage. */
:root[data-theme="light"] {
    --primary-bg: #f4f4f0;
    --panel-bg: #ffffff;
    --text-color: #222222;
    --primary-accent: #0077cc;
    --border-color: #cccccc;
    --muted-color: #777777;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
    --context-accent: #d4800f;
    --context-fill: rgba(212, 128, 15, 0.18);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    background-color: var(--primary-bg);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.2s, color 0.2s;
}

/* --- Main App Layout --- */
#app-container {
    display: grid;
    /* Create two columns: a fixed one for controls and a flexible one for main content. */
    grid-template-columns: 350px 1fr;
    height: 100vh;
    overflow: hidden;
}

/* This new div acts as our second column */
#main-content {
    display: grid;
    /* The timeline row sizes to its content; the info panel takes all remaining space. */
    grid-template-rows: auto minmax(250px, 1fr);
    /* Prevents the grid rows from overflowing the container. */
    overflow: hidden;
}

/* --- Controls Panel Styling --- */
#controls {
    /* No grid placement rules are needed; the HTML structure handles it. */
    background-color: var(--panel-bg);
    padding: 20px;
    border-right: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    overflow-y: auto; /* Allow controls to scroll if content is long */
}

.controls-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 8px;
}

#controls h1 {
    /* 1.35rem keeps the title, icon, and fold button on one line at 350px. */
    font-size: 1.35rem;
    margin-top: 0;
    color: var(--primary-accent);
}

.title-nowrap {
    white-space: nowrap;
}

.title-icon {
    height: 1.2em;
    width: 1.2em;
    vertical-align: -0.22em;
}

#theme-toggle {
    font-size: 1.1rem;
    line-height: 1;
    padding: 5px 8px;
    align-self: flex-start;
    margin-bottom: 12px;
}

#fold-btn {
    font-size: 1rem;
    line-height: 1;
    padding: 5px 9px;
    flex-shrink: 0;
}

/* --- Collapsed Controls Panel --- */
#app-container.controls-collapsed {
    grid-template-columns: 48px 1fr;
}

#app-container.controls-collapsed #controls {
    padding: 12px 6px;
}

#app-container.controls-collapsed #controls > :not(.controls-header),
#app-container.controls-collapsed .controls-header h1 {
    display: none;
}

#app-container.controls-collapsed .controls-header {
    justify-content: center;
}

#controls p {
    font-size: 0.9rem;
    margin-bottom: 20px;
}

#search-bar {
    width: 100%;
    padding: 10px;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    box-sizing: border-box;
    background-color: var(--primary-bg);
    color: var(--text-color);
}

#search-results {
    margin-top: 15px;
    overflow-y: auto;
    flex-grow: 1;
    min-height: 120px;
}

/* --- Saved Timelines & Data Actions --- */
#timelines-section,
#data-actions {
    border-top: 1px solid var(--border-color);
    padding-top: 12px;
    margin-top: 12px;
    flex-shrink: 0;
}

#timelines-section h2 {
    font-size: 1rem;
    margin: 0 0 8px;
    color: var(--primary-accent);
}

.save-timeline-row {
    display: flex;
    gap: 8px;
}

#timeline-name {
    flex-grow: 1;
    min-width: 0;
    padding: 6px 8px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--primary-bg);
    color: var(--text-color);
}

button {
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--primary-bg);
    color: var(--text-color);
    cursor: pointer;
    font-size: 0.85rem;
    transition: background-color 0.2s, border-color 0.2s;
}

button:hover {
    border-color: var(--primary-accent);
    color: var(--primary-accent);
}

#saved-timelines-list {
    margin-top: 8px;
    max-height: 140px;
    overflow-y: auto;
}

.saved-timeline-row {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 0;
}

.saved-timeline-name {
    flex-grow: 1;
    cursor: pointer;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.saved-timeline-name:hover {
    color: var(--primary-accent);
}

.saved-timeline-row button {
    padding: 3px 8px;
    font-size: 0.8rem;
}

#data-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.hint {
    font-size: 0.75rem;
    color: var(--muted-color);
    margin: 4px 0 0;
    width: 100%;
}

/* --- Add Person/Event Dialog --- */
#add-dialog {
    background-color: var(--panel-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 24px;
    width: min(420px, 90vw);
}

#add-dialog::backdrop {
    background: rgba(0, 0, 0, 0.6);
}

#add-form h2 {
    margin: 0 0 12px;
    font-size: 1.2rem;
    color: var(--primary-accent);
}

#add-form label {
    display: block;
    margin: 10px 0 4px;
    font-size: 0.85rem;
    font-weight: 600;
}

.label-note {
    font-weight: normal;
    color: var(--muted-color);
}

#add-form input,
#add-form select,
#add-form textarea {
    width: 100%;
    box-sizing: border-box;
    padding: 7px 9px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--primary-bg);
    color: var(--text-color);
    font-family: inherit;
    font-size: 0.9rem;
}

.form-error {
    color: #ff4081;
    font-size: 0.85rem;
    margin: 10px 0 0;
}

.dialog-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 16px;
}

#add-submit-btn {
    border-color: var(--primary-accent);
    color: var(--primary-accent);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
}

.result-item:hover {
    background-color: var(--text-color);
    color: var(--primary-bg);
}

.result-item label {
    flex-grow: 1;
    cursor: pointer;
}

.result-item input[type="checkbox"] {
    margin-left: 10px;
    accent-color: var(--primary-accent);
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* --- Timeline & Info Panel Styling --- */
#timeline-container {
    position: relative; /* Helps vis.js determine its size correctly */
}

#info-panel {
    background-color: var(--panel-bg);
    border-top: 1px solid var(--border-color);
    padding: 20px;
    box-sizing: border-box;
    min-height: 0;
    display: flex;
    gap: 20px;
    align-items: center;
    overflow: hidden;
}

#info-panel > div {
    max-height: 100%;
    overflow-y: auto;
}

#info-panel .placeholder {
    color: var(--muted-color);
    font-style: italic;
    width: 100%;
    text-align: center;
}

.info-image-box {
    /* Fill the panel's height, staying square; cap the width on short panels. */
    height: 100%;
    aspect-ratio: 1 / 1;
    max-width: 40%;
    flex-shrink: 0;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--primary-bg);
}

.info-image-box img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 4px;
}

/* --- Vis.js Timeline Custom Styling --- */
.vis-item {
    border-color: var(--primary-accent);
    background-color: rgba(0, 170, 255, 0.2);
    font-size: 0.78rem;
    line-height: 1.25;
    border-radius: 3px;
}


.vis-item .vis-item-content {
    text-align: center !important;
    width: 100%;
    padding: 1px 4px;
}

.vis-item.vis-selected {
    border-color: #ff4081;
    background-color: rgba(255, 64, 129, 0.3);
}

.vis-item.vis-point {
    color: var(--text-color);
}

/* Non-mathematical context events (className "context" in data.json) get a
   second accent color so they stand apart from the mathematical items. */
.vis-item.context {
    border-color: var(--context-accent);
    background-color: var(--context-fill);
}

.vis-item.vis-dot.context {
    border-color: var(--context-accent);
}

/* Make the vis.js axis and gridlines follow the active theme. */
.vis-timeline {
    border-color: var(--border-color);
}

.vis-time-axis .vis-text {
    color: var(--text-color);
}

.vis-grid.vis-minor {
    border-color: var(--border-color);
}

.vis-grid.vis-major {
    border-color: var(--muted-color);
}