/*
 * Mandelbrot Explorer — dark theme.
 *
 *   background : dark blue-grey
 *   borders    : red
 *   text       : light blue-grey
 *
 * Indentation: tabs (1 tab = 4 spaces).
 */

:root {
	--bg:            #161d29;   /* dark blue-grey background        */
	--bg-panel:      rgba(26, 34, 48, 0.82);
	--border:        #e74c3c;   /* red borders                      */
	--border-soft:   rgba(231, 76, 60, 0.55);
	--text:          #c8d4e0;   /* light blueish-grey text          */
	--text-dim:      #8a9bb0;
	--accent:        #e74c3c;
	--radius:        8px;
	--panel-pad:     10px 14px;
}

* {
	box-sizing: border-box;
}

html, body {
	margin: 0;
	padding: 0;
	width: 100%;
	height: 100%;
	overflow: hidden;
	background: var(--bg);
	color: var(--text);
	font-family: "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
	font-size: 14px;
	-webkit-user-select: none;
	user-select: none;
}

/* The canvas fills the viewport; touch-action:none lets us own all gestures. */
#view {
	position: fixed;
	inset: 0;
	width: 100%;
	height: 100%;
	display: block;
	touch-action: none;
	cursor: grab;
}

#view:active {
	cursor: grabbing;
}

/* Shared "hovering panel" look: translucent dark fill, red border. */
.panel {
	position: fixed;
	background: var(--bg-panel);
	border: 1px solid var(--border);
	border-radius: var(--radius);
	color: var(--text);
	backdrop-filter: blur(4px);
	-webkit-backdrop-filter: blur(4px);
	box-shadow: 0 2px 12px rgba(0, 0, 0, 0.45);
}

/* ---- Top-left info bar ---- */
#infobar {
	top: 12px;
	left: 12px;
	padding: var(--panel-pad);
	min-width: 150px;
	z-index: 10;
	pointer-events: none;            /* purely informational */
	font-variant-numeric: tabular-nums;
}

.info-row {
	display: flex;
	justify-content: space-between;
	gap: 16px;
	line-height: 1.5;
}

.info-label {
	color: var(--text-dim);
}

.info-value {
	color: var(--text);
	font-weight: 600;
}

/* ---- Hamburger toggle button ---- */
#menu-toggle {
	top: 12px;
	right: 12px;
	width: 42px;
	height: 42px;
	padding: 0;
	display: flex;
	align-items: center;
	justify-content: center;
	cursor: pointer;
	z-index: 30;
}

.hamburger,
.hamburger::before,
.hamburger::after {
	display: block;
	width: 20px;
	height: 2px;
	background: var(--accent);
	border-radius: 2px;
	transition: transform 0.2s ease, opacity 0.2s ease;
}

.hamburger {
	position: relative;
}

.hamburger::before,
.hamburger::after {
	content: "";
	position: absolute;
	left: 0;
}

.hamburger::before { top: -6px; }
.hamburger::after  { top:  6px; }

/* Morph into an X when the sidebar is open. */
#menu-toggle[aria-expanded="true"] .hamburger {
	background: transparent;
}

#menu-toggle[aria-expanded="true"] .hamburger::before {
	transform: translateY(6px) rotate(45deg);
}

#menu-toggle[aria-expanded="true"] .hamburger::after {
	transform: translateY(-6px) rotate(-45deg);
}

/* ---- Right slide-in sidebar ---- */
#sidebar {
	top: 0;
	right: 0;
	height: 100%;
	width: 240px;
	max-width: 80vw;
	border-radius: 0;
	border-top: none;
	border-bottom: none;
	border-right: none;
	padding: 64px 18px 18px;
	transform: translateX(100%);
	transition: transform 0.22s ease;
	z-index: 20;
	overflow-y: auto;
}

#sidebar.open {
	transform: translateX(0);
}

.sidebar-title {
	margin: 0 0 14px;
	font-size: 13px;
	font-weight: 600;
	text-transform: uppercase;
	letter-spacing: 0.08em;
	color: var(--text-dim);
	border-bottom: 1px solid var(--border-soft);
	padding-bottom: 8px;
}

.palette-list {
	list-style: none;
	margin: 0;
	padding: 0;
	display: flex;
	flex-direction: column;
	gap: 8px;
}

.palette-item {
	display: flex;
	align-items: center;
	gap: 10px;
	padding: 6px;
	border: 1px solid transparent;
	border-radius: 6px;
	cursor: pointer;
	transition: border-color 0.15s ease, background 0.15s ease;
}

.palette-item:hover {
	background: rgba(231, 76, 60, 0.10);
}

.palette-item.active {
	border-color: var(--border);
	background: rgba(231, 76, 60, 0.14);
}

/* Gradient preview swatch; its background image is filled in by ui.js. */
.palette-swatch {
	flex: 0 0 auto;
	width: 56px;
	height: 18px;
	border-radius: 4px;
	border: 1px solid var(--border-soft);
}

.palette-name {
	color: var(--text);
}

/* Sidebar title variant with top spacing to separate sections */
.sidebar-title--spaced {
	margin-top: 20px;
}

/* ---- Error overlay ---- */
.error-overlay {
	position: fixed;
	inset: 0;
	display: flex;
	align-items: center;
	justify-content: center;
	background: rgba(10, 14, 20, 0.92);
	z-index: 100;
}

.error-overlay[hidden] {
	display: none;
}

.error-box {
	max-width: 420px;
	padding: 24px 28px;
	text-align: center;
	border: 1px solid var(--border);
	border-radius: var(--radius);
	background: var(--bg-panel);
}

.error-box h1 {
	margin: 0 0 12px;
	color: var(--accent);
	font-size: 20px;
}

.error-box p {
	margin: 0;
	color: var(--text);
	line-height: 1.5;
}