:root {
	color-scheme: light;
	--bg: #eaf3fb;
	--bg-accent: rgba(255, 188, 139, 0.22);
	--surface: rgba(251, 253, 255, 0.86);
	--surface-solid: #fbfdff;
	--surface-muted: #edf4fb;
	--text: #182334;
	--text-muted: #5b6d83;
	--border: #cad8e8;
	--border-strong: #aec2d8;
	--accent: #367fc9;
	--accent-hover: #2566aa;
	--focus: rgba(54, 127, 201, 0.3);
	--success: #21874a;
	--danger: #c73d4c;
	--shadow-sm: 0 3px 8px rgba(38, 71, 108, 0.08), 0 1px 2px rgba(38, 71, 108, 0.06);
	--shadow: 0 16px 40px rgba(38, 71, 108, 0.14), 0 4px 12px rgba(38, 71, 108, 0.08);
	--shadow-lg: 0 28px 72px rgba(38, 71, 108, 0.2), 0 8px 24px rgba(38, 71, 108, 0.1);
	--inset: inset 0 1px 0 rgba(255, 255, 255, 0.86);
	--header: linear-gradient(110deg, rgba(255, 255, 255, 0.96), rgba(230, 242, 253, 0.94) 56%, rgba(252, 239, 229, 0.92));
	--control: linear-gradient(145deg, #ffffff, #eaf2fa);
	--radius-sm: 0.65rem;
	--radius: 0.9rem;
	--radius-lg: 1.25rem;
}

[data-theme='dark'] {
	color-scheme: dark;
	--bg: #080d15;
	--bg-accent: rgba(126, 78, 158, 0.22);
	--surface: rgba(17, 23, 34, 0.88);
	--surface-solid: #111722;
	--surface-muted: #1a2432;
	--text: #edf4ff;
	--text-muted: #a8b8cc;
	--border: #344257;
	--border-strong: #465a74;
	--accent: #90caf9;
	--accent-hover: #b6ddfc;
	--focus: rgba(144, 202, 249, 0.3);
	--success: #81c995;
	--danger: #ff8a92;
	--shadow-sm: 0 4px 10px rgba(0, 0, 0, 0.34), 0 1px 2px rgba(0, 0, 0, 0.48);
	--shadow: 0 18px 44px rgba(0, 0, 0, 0.46), 0 5px 14px rgba(0, 0, 0, 0.34);
	--shadow-lg: 0 32px 78px rgba(0, 0, 0, 0.58), 0 10px 28px rgba(0, 0, 0, 0.4);
	--inset: inset 0 1px 0 rgba(255, 255, 255, 0.08);
	--header: linear-gradient(110deg, rgba(27, 38, 54, 0.98), rgba(17, 25, 38, 0.97) 58%, rgba(42, 27, 52, 0.95));
	--control: linear-gradient(145deg, #202b3b, #101722);
}

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

html,
body {
	margin: 0;
	padding: 0;
}

html {
	background: var(--bg);
	scrollbar-gutter: stable;
}

body {
	min-width: 0;
	min-height: 100svh;
	font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
	color: var(--text);
	background:
		radial-gradient(circle at 8% 4%, rgba(78, 163, 231, 0.24), transparent 30%),
		radial-gradient(circle at 92% 8%, var(--bg-accent), transparent 28%),
		var(--bg);
	background-attachment: fixed;
	accent-color: var(--accent);
	transition: color 220ms ease, background 320ms ease;
}

button,
input,
select {
	font: inherit;
}

button,
select {
	min-height: 44px;
}

button {
	cursor: pointer;
}

::selection {
	background: var(--focus);
	color: var(--text);
}

:where(a, button, input, select, [tabindex]):focus-visible {
	outline: 3px solid var(--accent);
	outline-offset: 3px;
}

.app {
	width: min(900px, calc(100% - 2rem));
	margin: clamp(2rem, 5vw, 4rem) auto;
	padding: clamp(1rem, 2.5vw, 1.75rem);
	border: 1px solid var(--border);
	border-radius: var(--radius-lg);
	background: var(--surface);
	box-shadow: var(--shadow-lg), var(--inset);
	backdrop-filter: blur(20px) saturate(130%);
	-webkit-backdrop-filter: blur(20px) saturate(130%);
}

.header {
	position: sticky;
	top: 0;
	z-index: 20;
	width: 100%;
	border-bottom: 1px solid var(--border);
	background: color-mix(in srgb, var(--surface-solid) 88%, transparent);
	box-shadow: var(--shadow-sm);
	backdrop-filter: blur(18px) saturate(130%);
	-webkit-backdrop-filter: blur(18px) saturate(130%);
}

.header-container {
	width: min(1200px, calc(100% - 2rem));
	min-height: 74px;
	margin: 0 auto;
	padding: 0.85rem 0;
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 1rem;
}

.brand {
	flex: 1 1 55%;
	display: flex;
	align-items: center;
	gap: 0.8rem;
	min-width: 0;
}

.brand-logo {
	width: 36px;
	height: 36px;
	flex: 0 0 auto;
	border-radius: 10px;
	filter: drop-shadow(0 5px 10px rgba(44, 101, 153, 0.2));
}

.brand h1 {
	overflow: hidden;
	white-space: nowrap;
	text-overflow: ellipsis;
	margin: 0;
	font-size: clamp(1.2rem, 2.5vw, 1.5rem);
	line-height: 1;
	letter-spacing: -0.025em;
}

.header-nav,
.controls {
	display: flex;
	align-items: center;
	gap: 0.65rem;
	flex: 0 0 auto;
}

.sr-only {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border: 0;
}

.language-menu__trigger,
.theme-toggle {
	border: 1px solid var(--border);
	border-radius: var(--radius-sm);
	background: var(--control);
	color: var(--text);
	box-shadow: var(--shadow-sm), var(--inset);
	transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.language-select--native {
	display: none;
}

.language-menu {
	position: relative;
}

.language-menu__trigger {
	min-width: 140px;
	min-height: 44px;
	padding: 0.35rem 0.75rem 0.35rem 0.35rem;
	display: grid;
	grid-template-columns: auto 1fr auto;
	align-items: center;
	gap: 0.55rem;
	cursor: pointer;
	font: inherit;
	font-weight: 700;
	text-align: left;
}

.language-menu__flag {
	width: 1.75rem;
	height: 1.75rem;
	display: grid;
	place-items: center;
	border: 1px solid var(--border);
	border-radius: 0.5rem;
	color: var(--accent);
	background: var(--surface);
	font-size: 0.65rem;
	font-weight: 800;
	letter-spacing: 0.04em;
}

.language-menu__label {
	overflow: hidden;
	white-space: nowrap;
	text-overflow: ellipsis;
}

.language-menu__chevron {
	width: 1rem;
	height: 1rem;
	color: var(--muted);
	transform: rotate(180deg);
	transform-origin: center;
	transition: transform 240ms cubic-bezier(0.34, 1.56, 0.64, 1), color 180ms ease;
}

.language-menu__trigger[aria-expanded='true'] .language-menu__chevron {
	color: var(--accent);
	transform: rotate(0deg);
}

.language-menu__panel {
	position: absolute;
	top: calc(100% + 0.5rem);
	right: 0;
	z-index: 40;
	width: min(210px, calc(100vw - 1rem));
	padding: 0.4rem;
	display: grid;
	gap: 0.2rem;
	border: 1px solid var(--border);
	border-radius: var(--radius);
	background: var(--header);
	box-shadow: var(--shadow-lg);
	backdrop-filter: blur(18px);
	-webkit-backdrop-filter: blur(18px);
	animation: language-menu-in 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

.language-menu__panel[hidden] {
	display: none;
}

.language-menu__option {
	min-height: 44px;
	padding: 0.45rem 0.55rem;
	display: grid;
	grid-template-columns: auto 1fr auto;
	align-items: center;
	gap: 0.55rem;
	border: 1px solid transparent;
	border-radius: var(--radius-sm);
	background: transparent;
	color: var(--text);
	font: inherit;
	font-weight: 700;
	text-align: left;
	cursor: pointer;
}

.language-menu__option:hover,
.language-menu__option:focus-visible,
.language-menu__option[aria-checked='true'] {
	border-color: var(--border);
	background: var(--surface);
}

.language-menu__option[aria-checked='true'] {
	color: var(--accent);
}

.language-menu__check {
	opacity: 0;
}

.language-menu__option[aria-checked='true'] .language-menu__check {
	opacity: 1;
}

@keyframes language-menu-in {
	from {
		opacity: 0;
		transform: translateY(-6px) scale(0.98);
	}
}

.theme-toggle {
	width: 44px;
	height: 44px;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: 0;
	font-weight: 700;
}

.language-menu__trigger:hover,
.theme-toggle:hover {
	transform: translateY(-2px);
	border-color: var(--accent);
	box-shadow: var(--shadow), var(--inset);
}

.color-picker,
.color-preview,
.conversion-results {
	border: 1px solid var(--border);
	border-radius: var(--radius);
	background: color-mix(in srgb, var(--surface-solid) 88%, transparent);
	box-shadow: var(--shadow-sm), var(--inset);
}

.color-picker {
	padding: 1rem;
}

input,
select {
	border: 1px solid var(--border);
	border-radius: var(--radius-sm);
	background: var(--surface-solid);
	color: var(--text);
	transition: border-color 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

input:focus,
select:focus {
	border-color: var(--accent);
	box-shadow: 0 0 0 3px var(--focus), var(--shadow-sm);
	outline: none;
}

#color-input {
	width: 100%;
	min-height: 46px;
	margin-bottom: 0.85rem;
	padding: 0.65rem 0.8rem;
}

#palette {
	display: block;
	width: 100%;
	height: 220px;
	border: 1px solid var(--border-strong);
	border-radius: var(--radius-sm);
	box-shadow: var(--shadow), var(--inset);
	cursor: crosshair;
}

.alpha-slider {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	margin-top: 0.9rem;
}

.alpha-slider label {
	font-weight: 700;
}

#alpha {
	flex: 1;
}

.color-preview {
	display: flex;
	justify-content: center;
	margin: 1rem 0;
	padding: 1.35rem;
}

#selected-color {
	width: 112px;
	height: 112px;
	border: 8px solid var(--surface-solid);
	border-radius: 50%;
	box-shadow: var(--shadow), 0 0 0 1px var(--border);
	transition: transform 180ms ease, box-shadow 180ms ease;
}

#selected-color:hover {
	transform: translateY(-3px) scale(1.02);
	box-shadow: var(--shadow-lg), 0 0 0 1px var(--border-strong);
}

.conversion-results {
	padding: 1rem;
}

.conversion-results h2 {
	margin: 0 0 0.9rem;
	font-size: 1.35rem;
	letter-spacing: -0.02em;
}

.conversion-results ul {
	display: grid;
	gap: 0.65rem;
	margin: 0;
	padding: 0;
	list-style: none;
}

.conversion-results li {
	display: grid;
	grid-template-columns: 92px minmax(0, 1fr) auto auto;
	align-items: center;
	gap: 0.55rem;
	padding: 0.55rem;
	border: 1px solid transparent;
	border-radius: var(--radius-sm);
	background: var(--surface-muted);
}

.conversion-results strong {
	color: var(--text-muted);
	font-size: 0.88rem;
}

.conversion-results input {
	width: 100%;
	min-width: 0;
	padding: 0.65rem 0.75rem;
}

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

.copy-btn,
.update-btn {
	min-width: 78px;
	padding: 0.6rem 0.8rem;
	border: 1px solid var(--accent);
	border-radius: var(--radius-sm);
	background: var(--accent);
	color: #08111d;
	font-weight: 750;
	box-shadow: var(--shadow-sm), var(--inset);
	transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.update-btn {
	border-color: var(--border-strong);
	background: var(--control);
	color: var(--text);
}

.copy-btn:hover,
.update-btn:hover {
	transform: translateY(-2px);
	box-shadow: var(--shadow), var(--inset);
}

.copy-btn:hover {
	background: var(--accent-hover);
}

.notification {
	position: fixed;
	top: 1.25rem;
	right: 1.25rem;
	z-index: 1000;
	padding: 0.9rem 1.25rem;
	border: 1px solid color-mix(in srgb, var(--success) 55%, transparent);
	border-radius: var(--radius-sm);
	background: var(--success);
	color: #ffffff;
	box-shadow: var(--shadow-lg);
	opacity: 0;
	transform: translateY(-120%);
	transition: opacity 220ms ease, transform 220ms ease;
}

.notification.visible {
	opacity: 1;
	transform: translateY(0);
}

.notification.error {
	background: var(--danger);
}

.skip-link {
	position: fixed;
	top: 0.75rem;
	left: 0.75rem;
	z-index: 1100;
	transform: translateY(-180%);
	padding: 0.7rem 1rem;
	border: 1px solid var(--accent);
	border-radius: var(--radius-sm);
	background: var(--surface-solid);
	color: var(--text);
	box-shadow: var(--shadow);
}

.skip-link:focus {
	transform: translateY(0);
}

* {
	scrollbar-width: thin;
	scrollbar-color: var(--accent) var(--surface-muted);
}

*::-webkit-scrollbar {
	width: 10px;
	height: 10px;
}

*::-webkit-scrollbar-track,
*::-webkit-scrollbar-corner {
	background: var(--surface-muted);
}

*::-webkit-scrollbar-thumb {
	min-width: 36px;
	min-height: 36px;
	border: 2px solid var(--surface-muted);
	border-radius: 999px;
	background: linear-gradient(180deg, var(--accent), #bd8dca);
	background-clip: padding-box;
}

@media (max-width: 700px) {
	.app {
		width: min(100% - 1rem, 900px);
		margin: 0.5rem auto;
		padding: 0.75rem;
	}

	.header {
		position: sticky;
	}

	.header-container {
		width: min(100% - 1.5rem, 1200px);
		min-height: 66px;
		padding: 0.65rem 0;
	}

	.language-menu__trigger {
		min-width: 120px;
	}

	.conversion-results li {
		grid-template-columns: minmax(0, 1fr) auto auto;
	}

	.conversion-results strong {
		grid-column: 1 / -1;
	}
}

@media (max-width: 460px) {
	.header-container {
		width: calc(100% - 1rem);
		gap: 0.55rem;
	}

	.brand {
		gap: 0.55rem;
	}

	.brand-logo {
		width: 32px;
		height: 32px;
	}

	.brand h1 {
		font-size: 1.08rem;
	}

	.controls {
		gap: 0.45rem;
	}

	.language-menu__trigger {
		width: 54px;
		min-width: 54px;
		padding: 0.3rem;
		grid-template-columns: 1fr auto;
	}

	.language-menu__label { display: none; }

	.theme-toggle {
		width: 42px;
		height: 42px;
	}

	.conversion-results li {
		grid-template-columns: 1fr 1fr;
	}

	.conversion-results strong,
	.conversion-results input {
		grid-column: 1 / -1;
	}

	.copy-btn,
	.update-btn {
		width: 100%;
	}
}

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