/* Survey-sheet shell: title strip, layers on the left of the map, a full-width timeline with its
   key events flagged on it, and line plots ruled underneath. Pale blue-grey survey paper, navy
   ink and one teal for water; amber and red only ever mean drought. Dark is a navy night chart. */
:root {
	--bg: #edf1f3;
	--surface: #f7f9fa;
	--surface-2: #e2e8ec;
	--line: #c6d1d8;
	--rule: #20344d;
	--ink: #12233a;
	--ink-2: #364860;
	--ink-3: #52637a;
	--accent: #0d7068;
	--accent-ink: #ffffff;
	--focus: #0d7068;
	--warm: #b45309;
	--grid: rgb(32 70 110 / 6%);
	--stream: #2a7f9e;
	--land: #dfe6ea;
	--land-edge: #9aabb8;
	--land-side: #c3cfd7;
	--county: #c9d3da;
	--glass: #61788d;
	--shadow: 0 1px 2px rgb(18 35 58 / 8%), 0 6px 18px rgb(18 35 58 / 10%);
	--radius: 3px;
	--font-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
	--font-display: "Source Serif 4", "Source Serif Pro", Georgia, serif;
	--font-mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
	:root:not([data-theme="light"]) {
		--bg: #0b1626;
		--surface: #0f1d31;
		--surface-2: #16273d;
		--line: #253a52;
		--rule: #6f87a3;
		--ink: #e2eaf2;
		--ink-2: #afbfcf;
		--ink-3: #8a9db1;
		--accent: #3cc0ae;
		--accent-ink: #04201c;
		--focus: #6fd8ca;
		--warm: #f0a43a;
		--grid: rgb(120 160 200 / 7%);
		--stream: #5cc4d6;
		--land: #1b2b40;
		--land-edge: #4b6380;
		--land-side: #13213a;
		--county: #2a3e57;
		--glass: #9fb7cc;
		--shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 8px 24px rgb(0 0 0 / 30%);
		color-scheme: dark;
	}
}

:root[data-theme="dark"] {
	--bg: #0b1626;
	--surface: #0f1d31;
	--surface-2: #16273d;
	--line: #253a52;
	--rule: #6f87a3;
	--ink: #e2eaf2;
	--ink-2: #afbfcf;
	--ink-3: #8a9db1;
	--accent: #3cc0ae;
	--accent-ink: #04201c;
	--focus: #6fd8ca;
	--warm: #f0a43a;
	--grid: rgb(120 160 200 / 7%);
	--stream: #5cc4d6;
	--land: #1b2b40;
	--land-edge: #4b6380;
	--land-side: #13213a;
	--county: #2a3e57;
	--glass: #9fb7cc;
	--shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 8px 24px rgb(0 0 0 / 30%);
	color-scheme: dark;
}

body { background: var(--bg); font-family: var(--font-body); }

/* ---- Top bar ---- */
.site-header {
	position: sticky;
	top: 0;
	z-index: 20;
	max-width: none;
	gap: 16px;
	padding: 8px 16px;
	background: var(--surface);
	border-bottom: 1px solid var(--line);
	justify-content: flex-start;
}

.brand { font: 650 0.95rem/1.2 var(--font-body); white-space: nowrap; }
.brand-logo { width: 28px; height: 28px; }

.top-meta { display: flex; align-items: center; gap: 8px; padding-left: 16px; border-left: 1px solid var(--line); min-width: 0; }


.top-tabs { display: flex; gap: 2px; margin-left: auto; padding: 3px; border-radius: 8px; background: var(--surface-2); }
.top-tabs a { padding: 5px 12px; border-radius: 6px; color: var(--ink-2); font-size: 0.82rem; font-weight: 500; text-decoration: none; }
.top-tabs a:hover { color: var(--ink); }
.top-tabs a[aria-current="true"] { background: var(--surface); color: var(--ink); box-shadow: 0 1px 2px rgb(0 0 0 / 12%); }

.header-actions .theme-toggle { width: 34px; height: 34px; }

main { max-width: 1480px; }
html { scroll-padding-top: 64px; }

.intro { padding: 14px 0 12px; }
.intro h1 { font-weight: 650; letter-spacing: -0.015em; }
@media (min-width: 901px) { .intro h1 { font-size: 1.6rem; } }

/* ---- Workspace ---- */
.viz-card { border-radius: var(--radius); box-shadow: 0 1px 2px rgb(40 30 10 / 6%); }
.toolbar { padding: 8px 14px; }
.viz-body { grid-template-columns: 300px minmax(0, 1fr); }
.viz-body > .sidebar { order: -1; }

.panel-title { margin: 0; color: var(--ink-3); font: 600 0.7rem/1.3 var(--font-body); letter-spacing: 0.06em; text-transform: uppercase; }

.sidebar { border-right: 1px solid var(--line); background: var(--surface); overflow-y: auto; scrollbar-width: thin; }
.side-panel { border-bottom: 1px solid var(--line); }
.side-panel > summary { display: flex; align-items: center; justify-content: space-between; padding: 10px 14px; cursor: pointer; list-style: none; }
.side-panel > summary::-webkit-details-marker { display: none; }
.side-panel > summary::after { content: "▾"; font-size: 0.9em; }
.side-panel:not([open]) > summary::after { content: "▸"; }

.sidebar .summary { padding: 2px 14px 14px; border: 0; gap: 12px; max-height: none; overflow: visible; -webkit-mask-image: none; mask-image: none; }
.sidebar .summary .big { font-size: 1.6rem; font-weight: 650; }

/* Layers */
.layers { padding: 0 14px 10px; }
.layer-list { margin: 0; padding: 0; list-style: none; }
.layer-row { display: grid; grid-template-columns: minmax(0, 1fr) 88px 36px; align-items: center; gap: 8px; min-height: 30px; font-size: 0.82rem; color: var(--ink); }
.layer-name { grid-column: 1; display: flex; align-items: center; gap: 8px; cursor: pointer; }
.layer-name input { accent-color: var(--accent); margin: 0; }
.layer-opacity { width: 100%; accent-color: var(--accent); }
.layer-val { color: var(--ink-3); font-size: 0.75rem; text-align: right; }
.layer-note { margin: 4px 0 0; color: var(--ink-3); font-size: 0.72rem; }
.layers:not(.is-2d) .layer-note { display: none; }
.layers.is-2d .layer-row { opacity: 0.55; }

.view-3d .labels-3d { opacity: var(--label-opacity, 1); }
.view-3d.labels-off .labels-3d { display: none; }

/* Key/value card */
.res-card { padding: 0 14px 12px; font-size: 0.82rem; }
.card-empty { margin: 0; color: var(--ink-3); font-size: 0.8rem; }
.kv { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 5px 12px; margin: 0; }
.kv dt { color: var(--ink-3); }
.kv dd { margin: 0; color: var(--ink); text-align: right; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.pill { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 0.74rem; font-weight: 600; color: var(--ink); background: color-mix(in srgb, var(--pill, var(--ink-3)) 22%, transparent); border: 1px solid color-mix(in srgb, var(--pill, var(--ink-3)) 55%, transparent); }

/* Map chrome */
.map-dock { position: absolute; right: 12px; bottom: 12px; z-index: 3; display: flex; align-items: center; gap: 8px; }
.map-dock .stage-btn { position: static; }
.map-dock .mode-switch { background: var(--surface); border: 1px solid var(--line); padding: 2px; }
.map-dock .mode-switch button { min-width: 40px; padding: 4px 10px; font-size: 0.8rem; }
.map-dock .mode-switch button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }
.compass { right: auto; left: 12px; bottom: auto; top: 12px; }
.scale-bar { position: absolute; left: 12px; bottom: 14px; z-index: 3; display: flex; flex-direction: column; gap: 2px; pointer-events: none; color: #f4f1ea; font: 500 10px var(--font-mono); text-shadow: 0 1px 2px rgb(0 0 0 / 70%); }
.scale-line { display: block; height: 5px; border: 1.5px solid #f4f1ea; border-top: 0; box-shadow: 0 1px 2px rgb(0 0 0 / 40%); }
body[data-mode="3d"] .stage-hint { left: auto; }

/* ---- Bottom: timeline + key events ---- */
.bottom-row { display: grid; grid-template-columns: minmax(0, 1fr); border-top: 1px solid var(--line); }
.timeline-panel { display: flex; flex-direction: column; padding: 10px 0 0; min-width: 0; }
.timeline-panel .timeline { flex: 1; }
.timeline-panel > .panel-title { padding: 0 16px; }
.timeline-panel .timeline { border-top: 0; padding-top: 6px; }
.tl-buttons { display: flex; align-items: center; gap: 4px; }
.play-btn { width: 36px; height: 36px; }
.step-btn { display: grid; place-items: center; width: 30px; height: 30px; border: 1px solid var(--line); border-radius: 7px; background: var(--surface); color: var(--ink-2); cursor: pointer; }
.step-btn:hover { color: var(--ink); border-color: var(--ink-3); }
.step-btn svg { width: 14px; height: 14px; fill: currentColor; }
.track .event-mark { fill: var(--accent); stroke: var(--surface); stroke-width: 1; pointer-events: all; cursor: pointer; }
.hover-label { position: absolute; top: -16px; z-index: 3; transform: translateX(-50%); padding: 1px 6px; border-radius: 4px; background: var(--ink); color: var(--surface); font-size: 10px; pointer-events: none; white-space: nowrap; }


/* ---- Charts ---- */
.charts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin-top: 12px; }
.chart { min-width: 0; padding: 10px 12px 8px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.chart-head { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; margin-bottom: 4px; }
.chart-head .panel-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.chart-val { color: var(--ink); font-size: 0.75rem; white-space: nowrap; }
.chart-svg { display: block; width: 100%; height: 110px; overflow: visible; }
.chart-axis line { stroke: var(--line); }
.chart-axis text { fill: var(--ink-3); font: 400 9px var(--font-mono); }
.chart-line { fill: none; stroke: var(--accent); stroke-width: 1.4; }
.chart-ref { stroke: var(--ink-3); stroke-dasharray: 3 3; opacity: 0.8; }
.chart-marker line { stroke: var(--ink); opacity: 0.5; }
.chart-marker circle { fill: var(--accent); stroke: var(--surface); stroke-width: 1.5; }

@media (min-width: 901px) {
	.sidebar { max-height: var(--stage-h); }
}

@media (max-width: 1100px) {
}

@media (max-width: 900px) {
	.viz-body { grid-template-columns: 1fr; }
	/* Phone/tablet: the sidebar sits under the map as collapsible panels. */
	.viz-body > .sidebar { order: 0; border-right: 0; border-top: 1px solid var(--line); }
	.sidebar .summary { grid-template-columns: repeat(2, minmax(0, 1fr)); }
	.bottom-row { grid-template-columns: 1fr; }
	.charts { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
	.site-header { flex-wrap: wrap; gap: 8px 10px; }
	.top-meta { display: none; }
	.header-actions { margin-left: auto; }
	.top-tabs { order: 3; width: 100%; margin-left: 0; }
	.top-tabs a { flex: 1; text-align: center; }
	html { scroll-padding-top: 100px; }
}

@media (max-width: 560px) {
	.tl-buttons .step-btn { width: 28px; height: 28px; }
	.layer-row { grid-template-columns: minmax(0, 1fr) 72px 34px; }
}

@media (min-width: 901px) {
	/* Room for the slim top bar, the intro and the timeline panel under the stage. */
	.viz-body { --stage-h: clamp(400px, calc(100vh - 440px), 720px); }
	body[data-mode="3d"] .viz-body { --stage-h: clamp(380px, calc(100vh - 470px), 720px); }
}

/* Scale bar sits bottom-right above the dock, clear of the hint text; rows without a slider use the full width. */
.scale-bar { left: auto; right: 14px; bottom: 56px; align-items: flex-end; }
.layer-row:not([data-layer="labels"]) .layer-name { grid-column: 1 / -1; }

/* Layer names stay on one line. */
.layer-name span:last-child { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
/* The reservoir card sits top-left over the map: move the compass to its right. */
@media (min-width: 561px) { body[data-mode="3d"]:has(.detail-card:not([hidden])) .compass { left: 304px; } }
/* Full screen: the map card fills the screen, map takes what the timeline leaves. */
#map:fullscreen { overflow: auto; background: var(--bg); }
#map:fullscreen .viz-body, body[data-mode="3d"] #map:fullscreen .viz-body { --stage-h: calc(100vh - 250px); }
/* Desktop: the timeline spans the card; its key-event flags ride above the track. */
@media (min-width: 901px) {
	.timeline-panel .timeline { padding-bottom: 10px; }
	.timeline-panel .track { height: 60px; }
}
/* Zoom menu in the map dock: the current zoom, with presets opening upward. */
.zoom-menu { position: relative; }
.zoom-btn { display: inline-flex; align-items: center; gap: 4px; min-width: 64px; justify-content: center; }
.zoom-caret { width: 12px; height: 12px; fill: none; stroke: currentColor; stroke-width: 1.6; }
.zoom-list { position: absolute; right: 0; bottom: calc(100% + 6px); z-index: 5; min-width: 150px; margin: 0; padding: 4px; list-style: none; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 6px 20px rgb(0 0 0 / 16%); }
.zoom-list[hidden] { display: none; }
.zoom-list button { display: flex; justify-content: space-between; gap: 16px; width: 100%; padding: 6px 10px; border: 0; border-radius: 6px; background: none; color: var(--ink); font: inherit; font-size: 0.8rem; text-align: left; cursor: pointer; }
.zoom-list button:hover, .zoom-list button:focus-visible { background: var(--surface-2); }
.zoom-list button[aria-current="true"] { background: color-mix(in srgb, var(--accent) 14%, transparent); }
.zoom-list .num { color: var(--ink-3); }
.map-dock .stage-btn { white-space: nowrap; }
@media (max-width: 560px) {
	.map-dock { gap: 5px; right: 8px; }
	.map-dock .stage-btn { padding: 6px 9px; }
	.map-dock .mode-switch button { min-width: 34px; padding: 4px 8px; }
	.zoom-btn { min-width: 0; }
}
/* River profile chart: the dam marked at the start of the line. */
.chart-dam line { stroke: var(--ink); opacity: 0.35; stroke-dasharray: 2 2; }
.chart-dam circle { fill: var(--accent); stroke: var(--surface); stroke-width: 1.5; }
.chart-dam text { fill: var(--ink-2); font: 500 9px var(--font-mono); }

/* ================= Survey identity ================= */
/* Paper: a faint survey grid under everything. */
body {
	background-color: var(--bg);
	background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
	background-size: 24px 24px;
}
h1, h2, .detail-title { font-family: var(--font-display); font-weight: 600; letter-spacing: 0; }
.intro h1 { font-weight: 600; letter-spacing: -0.005em; }
.eyebrow { color: var(--accent); }

/* Title strip: plain text, a ruled line under it, no chips. */
.site-header { background: color-mix(in srgb, var(--bg) 94%, transparent); backdrop-filter: blur(6px); border-bottom: 1.5px solid var(--rule); }
.brand { font: 600 1.08rem/1.2 var(--font-display); letter-spacing: 0; }
.top-meta { display: block; margin: 0; padding-left: 14px; border-left: 1px solid var(--line); color: var(--ink-2); font-size: 0.82rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.top-meta .sep { margin: 0 4px; color: var(--ink-3); }
.top-tabs { gap: 18px; padding: 0; border-radius: 0; background: none; }
.top-tabs a { padding: 4px 0; border-radius: 0; border-bottom: 2px solid transparent; font-size: 0.84rem; }
.top-tabs a[aria-current="true"] { background: none; box-shadow: none; color: var(--ink); border-bottom-color: var(--accent); }
.theme-toggle, .sound-toggle, .header-actions .theme-toggle { border-radius: var(--radius); background: transparent; border-color: var(--line); }

/* The sheet: a thin navy frame, square corners. */
.viz-card { background: var(--surface); border: 1px solid var(--rule); border-radius: var(--radius); box-shadow: none; }
.panel-title { color: var(--ink); font: 600 0.92rem/1.3 var(--font-display); letter-spacing: 0; text-transform: none; }
.timeline-panel > .panel-title { display: none; }
.side-panel > summary { padding: 9px 14px 7px; }
.side-panel > summary::after { color: var(--ink-3); font-family: var(--font-body); }

/* Layers: line icons in the ink colour, teal when on. */
.layer-icon { width: 18px; height: 18px; flex: none; fill: none; stroke: var(--accent); stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; }
.layer-row.off .layer-icon { stroke: var(--ink-3); opacity: 0.55; }
.layer-row.off .layer-name span:last-child { opacity: 0.5; }
.layer-opacity { height: 14px; }

/* Squarer outlined controls. */
.stage-btn, .step-btn, .speed-btn, .zoom-btn, .map-dock .mode-switch, .map-dock .mode-switch button, .chip, .detail-listen { border-radius: var(--radius) !important; }
.map-dock .mode-switch { padding: 0; gap: 0; border-color: var(--rule); }
.map-dock .mode-switch button { border-radius: 0 !important; }
.map-dock .mode-switch button[aria-pressed="true"] { background: var(--rule); color: var(--surface); }
.map-dock .stage-btn { background: var(--surface); border: 1px solid var(--rule); color: var(--ink); box-shadow: none; }
.map-dock .stage-btn:hover { background: var(--surface-2); }
.play-btn { width: 36px; height: 36px; border-radius: var(--radius); border: 1.5px solid var(--accent); background: transparent; color: var(--accent); }
.play-btn:hover { background: color-mix(in srgb, var(--accent) 12%, transparent); }
.speed-btn { border-radius: var(--radius); }
.zoom-list { border-radius: var(--radius); }
.zoom-list button { border-radius: 2px; }
.pill { border-radius: 2px; }
.sound-pop { border-radius: var(--radius); }

/* Timeline: full width, flags for the key events standing on the track. */
.timeline-panel { padding-top: 4px; }
.track { margin-top: 38px; }
.track .spark-area { fill: var(--accent); opacity: 0.1; }
.track .spark-line { stroke: var(--accent); }
.track .event-mark { fill: var(--rule); stroke: none; }
.event-flags { position: absolute; left: 0; right: 0; bottom: 100%; height: 38px; z-index: 4; pointer-events: none; }
.event-flag { --row: 0; position: absolute; bottom: 2px; display: inline-flex; align-items: center; gap: 5px; height: 17px; padding: 0 6px; border: 1px solid var(--line); border-left: 2px solid var(--accent); border-radius: 0 2px 2px 0; background: var(--surface); color: var(--ink); font: 500 0.7rem/1 var(--font-body); white-space: nowrap; cursor: pointer; pointer-events: auto; }
.event-flag[data-row="1"] { --row: 1; bottom: 20px; }
.event-flag[data-side="left"] { transform: translateX(-100%); border-left: 1px solid var(--line); border-right: 2px solid var(--accent); border-radius: 2px 0 0 2px; }
/* The staff: from the flag down to the track. */
.event-flag::before { content: ""; position: absolute; left: -2px; top: 100%; width: 1px; height: calc(var(--row) * 18px + 2px); background: var(--accent); }
.event-flag[data-side="left"]::before { left: auto; right: -2px; }
.event-flag .event-year { display: none; color: var(--ink-3); }
.event-flag:hover { background: var(--surface-2); }
.event-flag[aria-current="true"] { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.event-flag:focus-visible { outline: 2px solid var(--focus); outline-offset: 1px; }
@media (max-width: 760px) {
	.event-flag .event-name { display: none; }
	.event-flag .event-year { display: inline; }
	.event-flag[aria-current="true"] .event-year { color: inherit; }
}

/* Charts: survey line plots under a rule, divided by hairlines; no cards, no fills. */
.charts { gap: 0; margin-top: 14px; border-top: 1.5px solid var(--rule); border-bottom: 1px solid var(--line); }
.chart { padding: 10px 16px 8px; background: none; border: 0; border-radius: 0; }
.chart + .chart { border-left: 1px solid var(--line); }
.chart-axis line { stroke: var(--line); stroke-dasharray: 1 3; }
.chart-line { stroke: var(--accent); stroke-width: 1.6; }
.chart-ref { stroke: var(--ink-3); stroke-dasharray: 4 3; }
.chart-marker line { stroke: var(--rule); opacity: 0.6; }
.chart-marker circle, .chart-dam circle { fill: var(--surface); stroke: var(--accent); stroke-width: 1.6; }
@media (max-width: 900px) {
	.chart + .chart { border-left: 0; border-top: 1px solid var(--line); }
}

/* Record-low ring on the map: navy-on-teal survey mark. */
.record-ring { border: 1.5px solid var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--rule) 22%, transparent); }
.record-text { border-radius: 2px; border-left: 2px solid var(--accent); }