:root {
	--bg0: #10151e;
	--bg1: #1b2432;
	--panel: #2c3442;
	--panel2: #394354;
	--edge: #0c1118;
	--display: #cfe0ae;
	--display2: #b9cd8a;
	--displayText: #1f2a12;
	--buttonText: #f4f7fb;
	--shadow: rgba(0, 0, 0, 0.35);
	--btnTop: #444c58;
	--btnBottom: #2f3640;
	--btnAccentTop: #3f526b;
	--btnAccentBottom: #2b394c;
	--btnAltTop: #525c69;
	--btnAltBottom: #3a434f;
	--btnDangerTop: #584042;
	--btnDangerBottom: #402d2f;
	--btnEscapeTop: #6a4a2a;
	--btnEscapeBottom: #4a331d;
	--btnEnterTop: #4f7f4d;
	--btnEnterBottom: #355a34;
	--btnText: #eef2f7;
}

* {
	box-sizing: border-box;
}

html, body {
	margin: 0;
	min-height: 100%;
}

body {
	min-height: 100vh;
	font-family: Arial, sans-serif;
	color: var(--buttonText);
	background:
		radial-gradient(circle at top, rgba(255, 255, 255, 0.08), transparent 32%),
		linear-gradient(180deg, var(--bg1), var(--bg0));
}

.app-shell {
	min-height: 100vh;
	display: grid;
	place-items: center;
	padding: 0;
}

.calculator {
	width: 100%;
	height: auto;
	min-height: 100%;
	display: grid;
	padding: 8px;
	border-radius: 8px;
	background: linear-gradient(180deg, var(--panel2), var(--panel));
	border: 1px solid var(--edge);
	box-shadow: 0 26px 70px var(--shadow), inset 0 1px 0 rgba(255, 255, 255, 0.08);
	grid-template-columns: 1fr;
	grid-template-rows: auto auto auto auto auto;
	row-gap: 6px;
	grid-template-areas:
		"display"
		"display-buttons"
		"keypad"
		"functions"
		"trigo";
}

.display-block,
.display-panel,
.keypad-panel,
.functions-panel,
.trigo-panel {
	border-radius: 8px;
	border: 1px solid rgba(255, 255, 255, 0.06);
	background: rgba(6, 10, 16, 0.16);
	box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.display-buttons-panel {
	border-radius: 8px;
	border: 1px solid rgba(255, 255, 255, 0.06);
	background: rgba(6, 10, 16, 0.16);
	box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.display-block {
	grid-area: display;
	display: grid;
	gap: 0;
	align-self: start;
	justify-items: stretch;
	grid-template-rows: auto auto;
	row-gap: 0;
}

.display-panel {
	position: relative;
	width: 100%;
	padding: 16px;
	padding-bottom: 8px;
	background: linear-gradient(180deg, var(--display), var(--display2));
	color: var(--displayText);
	font-family: "Courier New", monospace;
	overflow: hidden;
	height: auto;
	min-height: clamp(112px, 18vw, 124px);
	max-height: none;
	margin-bottom: 0;
}


.display-grid {
	height: 100%;
	display: grid;
	grid-template-columns: 1fr;
	grid-template-rows: repeat(4, minmax(0, 1fr));
	gap: 2px;
}

.stack-cell {
	display: grid;
	grid-template-columns: 2.2ch 1fr auto;
	align-items: center;
	gap: 12px;
	font-size: clamp(18px, 3vw, 30px);
	line-height: 1;
	min-height: 0;
	padding-block: 0;
}

.stack-label {
	text-align: right;
	opacity: 0.78;
}

.stack-value {
	min-height: 0;
	white-space: nowrap;
	overflow: hidden;
	text-overflow: ellipsis;
	text-align: right;
	justify-self: end;
}

.display-buttons-panel {
	grid-area: display-buttons;
	padding: 10px;
	align-self: start;
	min-height: 0;
	padding-top: 10px;
	padding-bottom: 8px;
}

.display-buttons-grid {
	display: grid;
	grid-template-columns: repeat(4, minmax(0, 1fr));
	gap: 8px;
	align-content: start;
	align-items: stretch;
}

.display-button-spacer {
	pointer-events: none;
	visibility: hidden;
	background: transparent;
	border-color: transparent;
	box-shadow: none;
}

.display-button {
	background: linear-gradient(180deg, var(--btnTop), var(--btnBottom));
	color: #eef2f7;
	box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18), 0 3px 0 rgba(0, 0, 0, 0.28);
}


.display-button-symbol {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	min-width: 1.2em;
	font-size: 1.05em;
	line-height: 1;
	font-weight: 800;
	transform: translateY(-0.01em);
}

.paste-symbol {
	font-size: 1em;
}

.display-buttons-grid > button {
	padding: 6px 8px;
}


.mode-menu {
	position: fixed;
	z-index: 20;
	display: grid;
	gap: 6px;
	padding: 10px;
	border-radius: 8px;
		background: rgba(6, 10, 16, 0.16);
	border: 1px solid rgba(255, 255, 255, 0.08);
	box-shadow: 0 14px 30px rgba(0, 0, 0, 0.35);
}

.mode-menu-item {
	min-width: 120px;
	background: linear-gradient(180deg, var(--btnAltTop), var(--btnAltBottom));
}

.mode-menu-item.is-active {
	outline: 2px solid rgba(207, 224, 174, 0.7);
}

.key-escape {
	background: linear-gradient(180deg, var(--btnEscapeTop), var(--btnEscapeBottom));
	color: #eef2f7;
}

.keypad-panel {
	grid-area: keypad;
	padding: 10px;
}

.functions-panel {
	grid-area: functions;
	padding: 10px;
	align-self: start;
	min-height: 0;
	padding-top: 10px;
	padding-bottom: 8px;
}

.trigo-panel {
	grid-area: trigo;
	padding: 10px;
	align-self: start;
	min-height: 0;
	padding-top: 10px;
	padding-bottom: 8px;
}

.status-bar {
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	z-index: 2;
	padding: 8px 12px;
	min-height: 30px;
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 13px;
	font-weight: 700;
	letter-spacing: 0.02em;
	color: rgba(31, 42, 18, 0.96);
	background: rgba(255, 246, 170, 0.92);
	border-bottom: 1px solid rgba(31, 42, 18, 0.2);
	transform: translateY(-100%);
	opacity: 0;
	transition: transform 180ms ease, opacity 180ms ease;
	pointer-events: none;
}

.status-bar.is-visible {
	transform: translateY(0);
	opacity: 1;
}

.status-bar.is-error {
	color: #fff;
	background: rgba(72, 14, 14, 0.98);
	border-bottom-color: rgba(255, 255, 255, 0.12);
}

.keypad-grid,
.functions-grid,
.trigo-grid {
	display: grid;
	gap: 8px;
	grid-auto-rows: minmax(0, 1fr);
}

.keypad-grid {
	grid-template-columns: repeat(4, minmax(0, 1fr));
	grid-template-rows: repeat(5, minmax(0, 1fr));
}

.functions-grid,
.trigo-grid {
	grid-template-columns: repeat(4, minmax(0, 1fr));
}

.functions-grid,
.trigo-grid {
	grid-template-rows: repeat(2, minmax(0, 1fr));
}

button {
	border: 1px solid rgba(14, 18, 25, 0.85);
	border-radius: 8px;
	padding: 8px 8px;

	font: inherit;
	font-weight: 700;
	color: var(--btnText);
	text-shadow: 0 1px 0 rgba(0, 0, 0, 0.35);
	cursor: pointer;
	box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18), 0 3px 0 rgba(0, 0, 0, 0.28);
	transition: transform 120ms ease, filter 120ms ease, box-shadow 120ms ease, opacity 120ms ease;
	line-height: 1;
}

button:hover {
	filter: brightness(1.06);
}


button:active {
	transform: translateY(2px);
	box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08), 0 1px 0 rgba(0, 0, 0, 0.25);
}


.stack-copy-button {
	padding: 4px;
	border-radius: 999px;
	min-width: 24px;
	width: 24px;
	height: 24px;
	display: inline-grid;
	place-items: center;
	opacity: 0;
	pointer-events: none;
	transform: scale(0.9);
	background: transparent;
	box-shadow: none;
	color: rgba(31, 42, 18, 0.58);
	margin-left: 6px;
}

.stack-cell:last-child {
	margin-bottom: 4px;
}

.stack-copy-button svg {
	width: 13px;
	height: 13px;
	fill: currentColor;
	display: block;
}

.stack-copy-button.is-visible {
	opacity: 0.7;
	pointer-events: auto;
	transform: scale(1);
}

.stack-copy-button:hover {
	opacity: 1;
	filter: none;
	color: rgba(31, 42, 18, 0.85);
}

.stack-copy-button:active {
	transform: translateY(2px) scale(1);
	color: rgba(31, 42, 18, 0.95);
}

.stack-copy-button:focus-visible {
	outline: 1px solid rgba(31, 42, 18, 0.35);
	outline-offset: 2px;
}

.key-default {
	background: linear-gradient(180deg, var(--btnTop), var(--btnBottom));
	color: #eef2f7;
}

.key-accent {
	background: linear-gradient(180deg, var(--btnAccentTop), var(--btnAccentBottom));
	color: #eef2f7;
}

.key-danger {
	background: linear-gradient(180deg, var(--btnDangerTop), var(--btnDangerBottom));
	color: #eef2f7;
}

.key-enter {
	background: linear-gradient(180deg, var(--btnEnterTop), var(--btnEnterBottom));
	color: #eef2f7;
	padding-inline: 6px;
}

@media (max-width: 700px) {
	.key-enter {
		padding-inline: 4px;
		letter-spacing: 0.01em;
	}

	
	.display-button-symbol {
		min-width: 1.28em;
		font-size: 1.3em;
	}

	.display-buttons-grid > button {
		padding: 6px 8px;
	}
}

.hidden-input {
	position: absolute;
	left: -9999px;
	width: 1px;
	height: 1px;
	opacity: 0;
	pointer-events: none;
}