/* ==========================================================================
   ToyKit: kit.css, the shared look of the toys under misc/.

   Loaded first in a toy's <head>, right before kit.js:
       <link rel="stylesheet" href="../_kit/kit.css"><script src="../_kit/kit.js"></script>

   It carries the site's colour tokens (the names and values of
   assets/css/main.css), a body reset, and the parts kit.js builds: header,
   theme toggle, help button and dialog, back link, failure panel, toast,
   footer. It also has a few helpers a toy may use: .kit-btn, .kit-chip,
   .kit-input, .kit-row, .kit-pad, .kit-note, .kit-sr, .kit-nothumb.

   Theme: <html data-theme="light|dark">, set by kit.js before first paint.
   A toy's own stylesheet comes after this one and may override any token:
   light values on :root, dark values on :root[data-theme="dark"]. A token
   the toy leaves out of its dark block keeps the kit's dark value.
   No fonts are loaded here. The stack starts with Inter when it is installed;
   a toy may add its own Google Fonts link.
   ========================================================================== */

/* ---------- Tokens ------------------------------------------------------ */

:root {
	--bg: #ffffff;
	--surface: #f7f8fa;
	--surface-2: #eef0f3;
	--text: #1b1f24;
	--text-2: #5f6873;
	--heading: #0d1117;
	--border: #e2e5e9;
	--border-strong: #cfd4da;
	--accent: #1f5fd6;
	--accent-soft: rgba(31, 95, 214, 0.10);
	--accent-ring: rgba(31, 95, 214, 0.35);
	--shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 8px 24px rgba(16, 24, 40, 0.06);

	--font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Hiragino Sans', 'Yu Gothic UI', 'Noto Sans CJK JP', sans-serif;
	--font-mono: 'JetBrains Mono', ui-monospace, 'Cascadia Mono', 'SFMono-Regular', Menlo, Consolas, 'Lucida Console', monospace;

	--ease-out: cubic-bezier(0.22, 1, 0.36, 1);
	--dur-fast: 160ms;
	--dur: 320ms;
	--dur-slow: 520ms;

	/* kit-only: the failure panel, and the side gutter of header and footer */
	--kit-warn: #b3261e;
	--kit-warn-soft: rgba(179, 38, 30, 0.07);
	--kit-warn-line: rgba(179, 38, 30, 0.28);
	--kit-gutter: 18px;

	color-scheme: light;
}

:root[data-theme="dark"] {
	--bg: #0f1115;
	--surface: #161a20;
	--surface-2: #1e232b;
	--text: #d5dae2;
	--text-2: #9aa3af;
	--heading: #f3f5f8;
	--border: #262c35;
	--border-strong: #343c47;
	--accent: #7cb3ff;
	--accent-soft: rgba(124, 179, 255, 0.12);
	--accent-ring: rgba(124, 179, 255, 0.40);
	--shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 8px 24px rgba(0, 0, 0, 0.35);

	--kit-warn: #ff9f8f;
	--kit-warn-soft: rgba(255, 159, 143, 0.09);
	--kit-warn-line: rgba(255, 159, 143, 0.30);

	color-scheme: dark;
}

/* ---------- Base -------------------------------------------------------- */

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

html {
	-webkit-text-size-adjust: 100%;
	text-size-adjust: 100%;
}

html, body { margin: 0; }

/* The page is a column: header, the toy (give it class kit-main to fill the
   space that is left), footer. */
body {
	display: flex;
	flex-direction: column;
	min-height: 100vh;
	min-height: 100dvh;
	overflow-x: hidden;
	background: var(--bg);
	color: var(--text);
	font: 15px/1.5 var(--font-body);
	accent-color: var(--accent);
	-webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { color: var(--heading); }

a {
	color: var(--accent);
	text-decoration-thickness: 1px;
	text-underline-offset: 2px;
}

button, input, select, textarea { font: inherit; }

[hidden] { display: none !important; }

code {
	font-family: var(--font-mono);
	font-size: 0.92em;
}

kbd {
	padding: 2px 5px;
	border: 1px solid var(--border-strong);
	border-radius: 4px;
	background: var(--surface-2);
	color: var(--text);
	font: 12px/1 var(--font-mono);
}

/* Keyboard focus. :where() keeps the specificity at zero, so a toy's own
   :focus-visible rule wins without a fight. */
:where(a, button, input, select, textarea, summary, canvas, [tabindex]:not([tabindex="-1"]), [contenteditable="true"]):focus-visible {
	outline: 2px solid var(--accent);
	outline-offset: 2px;
}

/* For screen readers only. */
.kit-sr {
	position: absolute;
	width: 1px;
	height: 1px;
	margin: -1px;
	padding: 0;
	overflow: hidden;
	clip: rect(0 0 0 0);
	clip-path: inset(50%);
	white-space: nowrap;
	border: 0;
}

/* ---------- Layout helpers ----------------------------------------------- */

.kit-main {
	position: relative;
	flex: 1 1 auto;
	min-width: 0;
}

.kit-pad { padding: 14px var(--kit-gutter) 16px; }

.kit-row {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 8px 10px;
}

.kit-note {
	color: var(--text-2);
	font-size: 13px;
}

/* ---------- Header ------------------------------------------------------- */

.kit-header {
	display: flex;
	flex-wrap: wrap;
	align-items: baseline;
	gap: 4px 14px;
	padding: 10px var(--kit-gutter) 9px;
	padding-left: max(var(--kit-gutter), env(safe-area-inset-left));
	padding-right: max(var(--kit-gutter), env(safe-area-inset-right));
	border-bottom: 1px solid var(--border);
}

.kit-header h1 {
	min-width: 0;
	margin: 0;
	color: var(--heading);
	font: 650 20px/1.3 var(--font-body);
	letter-spacing: -0.01em;
	overflow-wrap: anywhere;
}

/* The sub line takes the room between title and buttons and wraps inside it. */
.kit-sub {
	flex: 1000 1 14em;
	min-width: 0;
	color: var(--text-2);
	font-size: 14px;
}

.kit-spacer { flex: 1 1 0; }

.kit-tools {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	align-self: center;
	justify-content: flex-end;
	gap: 8px;
	margin-left: auto;
}

.kit-theme,
.kit-help {
	display: inline-flex;
	flex: none;
	align-items: center;
	justify-content: center;
	width: 34px;
	height: 34px;
	padding: 0;
	border: 1px solid var(--border-strong);
	border-radius: 999px;
	background: transparent;
	color: var(--text-2);
	font: 600 15px/1 var(--font-body);
	cursor: pointer;
	transition: background-color var(--dur-fast) ease, color var(--dur-fast) ease;
}

.kit-theme:hover,
.kit-help:hover {
	background: var(--surface-2);
	color: var(--text);
}

.kit-theme svg {
	display: block;
	width: 17px;
	height: 17px;
	fill: none;
	stroke: currentColor;
	stroke-width: 1.8;
	stroke-linecap: round;
	stroke-linejoin: round;
}

/* The button shows where it leads: a moon in the light theme, a sun in the dark. */
.kit-theme .kit-i-sun { display: none; }
:root[data-theme="dark"] .kit-theme .kit-i-sun { display: block; }
:root[data-theme="dark"] .kit-theme .kit-i-moon { display: none; }

.kit-back {
	padding: 7px 0 7px 4px;
	color: var(--text-2);
	font-size: 14px;
	text-decoration: none;
	white-space: nowrap;
}

.kit-back:hover { color: var(--text); }

/* ---------- Buttons, chips, inputs --------------------------------------- */

.kit-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 6px;
	min-height: 34px;
	padding: 5px 12px;
	border: 1px solid var(--border-strong);
	border-radius: 8px;
	background: var(--surface);
	color: var(--text);
	font: inherit;
	font-size: 14px;
	line-height: 1.2;
	text-decoration: none;
	white-space: nowrap;
	cursor: pointer;
	transition: background-color var(--dur-fast) ease, border-color var(--dur-fast) ease, color var(--dur-fast) ease;
}

.kit-btn:hover { background: var(--surface-2); }
.kit-btn:active { transform: translateY(1px); }

.kit-btn.primary,
.kit-btn.on,
.kit-btn[aria-pressed="true"] {
	border-color: transparent;
	background: var(--accent);
	color: var(--bg);
}

.kit-btn.primary { font-weight: 600; }

.kit-btn.small {
	min-height: 28px;
	padding: 3px 9px;
	font-size: 13px;
}

.kit-btn:disabled,
.kit-btn[aria-disabled="true"] {
	opacity: 0.5;
	cursor: default;
	transform: none;
}

.kit-btn kbd { font-size: 11px; }

.kit-chip {
	display: inline-flex;
	align-items: center;
	gap: 5px;
	min-height: 24px;
	padding: 2px 10px;
	border: 1px solid var(--border);
	border-radius: 999px;
	background: var(--surface);
	color: var(--text-2);
	font: inherit;
	font-size: 12.5px;
	line-height: 1.3;
	text-decoration: none;
	white-space: nowrap;
}

button.kit-chip,
a.kit-chip { cursor: pointer; }

button.kit-chip:hover,
a.kit-chip:hover {
	border-color: var(--border-strong);
	background: var(--surface-2);
	color: var(--text);
}

.kit-chip.on,
.kit-chip[aria-pressed="true"] {
	border-color: var(--accent-ring);
	background: var(--accent-soft);
	color: var(--accent);
}

.kit-input {
	max-width: 100%;
	min-height: 34px;
	padding: 5px 9px;
	border: 1px solid var(--border-strong);
	border-radius: 8px;
	background: var(--bg);
	color: var(--text);
	font: inherit;
	font-size: 14px;
}

.kit-input::placeholder { color: var(--text-2); }

/* ---------- Failure panel ------------------------------------------------- */

.kit-fail {
	display: flex;
	flex-wrap: wrap;
	align-items: flex-start;
	gap: 8px 14px;
	margin: 12px var(--kit-gutter) 0;
	padding: 10px 12px 10px 14px;
	border: 1px solid var(--kit-warn-line);
	border-left: 4px solid var(--kit-warn);
	border-radius: 8px;
	background: var(--kit-warn-soft);
	color: var(--text);
	font-size: 14px;
}

.kit-fail-body {
	flex: 1 1 16em;
	min-width: 0;
}

.kit-fail p { margin: 0; }
.kit-fail p + p,
.kit-fail details + p { margin-top: 8px; }

.kit-fail details {
	margin-top: 4px;
	color: var(--text-2);
	font-size: 13px;
}

.kit-fail summary { cursor: pointer; }

.kit-fail code {
	display: block;
	margin-top: 4px;
	font: 12px/1.45 var(--font-mono);
	overflow-wrap: anywhere;
}

/* ---------- Footer ("How it works") ---------------------------------------- */

.kit-footer {
	padding: 10px var(--kit-gutter) 14px;
	padding-left: max(var(--kit-gutter), env(safe-area-inset-left));
	padding-right: max(var(--kit-gutter), env(safe-area-inset-right));
	border-top: 1px solid var(--border);
	color: var(--text-2);
	font-size: 13px;
}

.kit-footer p {
	max-width: 72em;
	margin: 0;
}

.kit-footer p + p { margin-top: 6px; }

.kit-footer b,
.kit-footer strong {
	color: var(--text);
	font-weight: 600;
}

.kit-footer a { color: inherit; }
.kit-footer a:hover { color: var(--accent); }
.kit-footer code { font: 12px var(--font-mono); }

/* ---------- Help dialog ---------------------------------------------------- */

.kit-backdrop {
	position: fixed;
	inset: 0;
	z-index: 1000;
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 16px;
	background: rgba(8, 10, 14, 0.62);
	-webkit-backdrop-filter: blur(2px);
	backdrop-filter: blur(2px);
}

.kit-dialog {
	display: flex;
	flex-direction: column;
	width: min(100%, 560px);
	max-height: min(86vh, 720px);
	max-height: min(86dvh, 720px);
	overflow: hidden;
	border: 1px solid var(--border-strong);
	border-radius: 12px;
	outline: none;
	background: var(--surface);
	color: var(--text);
	box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
	animation: kit-pop var(--dur-fast) var(--ease-out);
}

@keyframes kit-pop {
	from { opacity: 0; transform: translateY(6px) scale(0.985); }
	to { opacity: 1; transform: none; }
}

.kit-dialog-head {
	display: flex;
	align-items: center;
	gap: 10px;
	padding: 10px 12px 10px 16px;
	border-bottom: 1px solid var(--border);
}

.kit-dialog-head h2 {
	flex: 1;
	min-width: 0;
	margin: 0;
	font: 650 17px/1.3 var(--font-body);
	overflow-wrap: anywhere;
}

.kit-dialog-body {
	padding: 14px 16px 18px;
	overflow: auto;
	overscroll-behavior: contain;
	font-size: 14.5px;
}

.kit-dialog-body > :first-child { margin-top: 0; }
.kit-dialog-body > :last-child { margin-bottom: 0; }
.kit-dialog-body p { margin: 8px 0; }

.kit-dialog-body h3 {
	margin: 16px 0 6px;
	color: var(--text-2);
	font: 600 12px/1.2 var(--font-body);
	letter-spacing: 0.12em;
	text-transform: uppercase;
}

/* ---------- Toast ---------------------------------------------------------- */

.kit-toast {
	position: fixed;
	right: 16px;
	bottom: max(18px, env(safe-area-inset-bottom));
	left: 16px;
	z-index: 1100;
	width: fit-content;
	max-width: calc(100% - 32px);
	margin: 0 auto;
	padding: 8px 14px;
	border-radius: 8px;
	background: var(--heading);
	color: var(--bg);
	box-shadow: var(--shadow);
	font-size: 13.5px;
	line-height: 1.35;
	text-align: center;
	opacity: 0;
	transform: translateY(8px);
	pointer-events: none;
	transition: opacity var(--dur-fast) ease, transform var(--dur-fast) var(--ease-out);
}

.kit-toast.show {
	opacity: 1;
	transform: none;
}

/* ---------- Narrow screens (works from 360 px) ----------------------------- */

@media (max-width: 720px) {
	:root { --kit-gutter: 16px; }
	.kit-header {
		align-items: center;
		gap: 4px 10px;
	}
	.kit-header h1 { font-size: 18px; }
	.kit-sub { display: none; }
}

/* Fingers need bigger targets than a mouse does. */
@media (pointer: coarse) {
	.kit-theme,
	.kit-help {
		width: 44px;
		height: 44px;
	}
	.kit-back { padding: 12px 0 12px 6px; }
	.kit-btn { min-height: 44px; }
	.kit-btn.small { min-height: 36px; }
	.kit-input { min-height: 44px; }
}

/* ---------- Reduced motion --------------------------------------------------
   Three ways in, one result: the OS setting, ?motion=reduce and ?thumb=1 (the
   last two as html.is-reduced, which kit.js keeps up to date). CSS animations
   and transitions finish at once; a toy's script asks ToyKit.reducedMotion. */

@media (prefers-reduced-motion: reduce) {
	:root {
		--dur-fast: 0ms;
		--dur: 0ms;
		--dur-slow: 0ms;
	}
	*, *::before, *::after {
		animation-duration: 0.01ms !important;
		animation-delay: 0s !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.01ms !important;
		transition-delay: 0s !important;
		scroll-behavior: auto !important;
	}
}

html.is-reduced {
	--dur-fast: 0ms;
	--dur: 0ms;
	--dur-slow: 0ms;
}

html.is-reduced *,
html.is-reduced *::before,
html.is-reduced *::after {
	animation-duration: 0.01ms !important;
	animation-delay: 0s !important;
	animation-iteration-count: 1 !important;
	transition-duration: 0.01ms !important;
	transition-delay: 0s !important;
	scroll-behavior: auto !important;
}

/* ---------- Thumbnail mode (?thumb=1) ----------------------------------------
   Header, footer, help and toast go; the toy fills the frame. Mark anything
   else that should stay out of a thumbnail with class kit-nothumb. */

html.is-thumb,
html.is-thumb body {
	height: 100%;
}

html.is-thumb body { overflow: hidden; }

html.is-thumb .kit-header,
html.is-thumb .kit-footer,
html.is-thumb .kit-help,
html.is-thumb .kit-backdrop,
html.is-thumb .kit-toast,
html.is-thumb .kit-nothumb {
	display: none !important;
}

html.is-thumb .kit-main { min-height: 0; }