:root {
	--font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji", sans-serif;
	--sky-500: #0ea5e9;
	--sky-600: #0284c7;

	/* Light Theme */
	--bg-light: #f0f9ff;
	--bg-gradient-light: linear-gradient(135deg, #e0f2fe 0%, #f0f9ff 100%);
	--card-bg-light: #ffffff;
	--text-color-light: #1e293b;
	--secondary-text-light: #64748b;
	--border-color-light: #cbd5e1;
	--input-bg-light: #f8fafc;

	/* Dark Theme */
	--bg-dark: #0f172a;
	--bg-gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
	--card-bg-dark: #1e293b;
	--text-color-dark: #e2e8f0;
	--secondary-text-dark: #94a3b8;
	--border-color-dark: #475569;
	--input-bg-dark: #334155;
}

/* Base Styles */
* {
	box-sizing: border-box;
}

html {
	height: 100%;
	font-size: 16px;
	-webkit-transition: background-color 0.3s ease;
	transition: background-color 0.3s ease;
}

body {
	font-family: var(--font-family);
	font-size: 1rem;
	background: var(--bg-light) var(--bg-gradient-light);
	color: var(--text-color-light);
	-webkit-transition: background 0.3s ease, color 0.3s ease;
	transition: background 0.3s ease, color 0.3s ease;
	-webkit-tap-highlight-color: transparent;
	height: 100%;
	margin: 0px;
	padding: 0px;
}

html.dark body {
	background: var(--bg-dark) var(--bg-gradient-dark);
	color: var(--text-color-dark);
}

a{
	color: var(--sky-500);
}

/* Layout */
.app{
	display: -ms-flexbox;
	display: flex;
	-ms-flex-direction: column;
	flex-direction: column;
	height: 100%;
}

.container {
	max-width: 672px;
	margin: 0 auto;
}

header{
	-ms-flex: 0 0 auto;
	flex: 0 0 auto;
	position: sticky;
	position: -webkit-sticky;
	top: 0px;
	margin-bottom: 0.5rem;
	background: var(--card-bg-light);
}

footer{
	-ms-flex: 0 0 auto;
	flex: 0 0 auto;
	background: var(--card-bg-light);
}

footer .container {
	padding-top: 0.8rem;
}

header .container{
	display: -ms-flexbox;
	display: flex;
	-ms-flex-pack: justify;
	justify-content: space-between;
	-ms-flex-align: center;
	align-items: center;
	padding: 0.5rem;
}

.main-title {
	margin: 0.2rem 0px;
	font-size: 2rem;
	font-weight: 700;
	color: var(--sky-500);
}

.main-title img{
	vertical-align: middle;
	width: 2rem;
	height: 2rem;
}

main {
	-ms-flex: 1 1 auto;
	flex: 1 1 auto;
}

main .container{
	padding: 1.5rem;
	border-radius: 1rem;
	background-color: var(--card-bg-light);
	box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
	-webkit-transition: background-color 0.3s ease;
	transition: background-color 0.3s ease;
}

html.dark header,
html.dark main .container,
html.dark footer{
	background-color: var(--card-bg-dark);
}

.form-group {
	margin-bottom: 1.5rem;
}

.form-label {
	display: block;
	font-size: 0.75rem;
	font-weight: 500;
	margin-bottom: 0.4rem;
}

.conversion-grid {
	display: grid;
	grid-template-columns: 1fr;
	gap: 1rem;
	align-items: center;
}

.input-group {
	position: relative;
}

.form-input {
	width: 100%;
	padding: 0.75rem 1rem;
	height: 3.5rem;
	border-radius: 0.5rem;
	border: 1px solid var(--border-color-light);
	background-color: var(--input-bg-light);
	font-size: 1.125rem;
	outline: none;
	-webkit-transition: all 0.2s ease;
	transition: all 0.2s ease;
}

.conversion-grid .form-input{
    border-radius: 0.5rem 0.5rem 0 0;
}

.conversion-grid .unit-select .choices__inner,
.conversion-grid .unit-select .form-input{
    border-radius: 0 0 0.5rem 0.5rem;
    border-top: none;
}

.form-input:focus {
	border-color: var(--sky-500);
	box-shadow: 0 0 0 2px rgba(14, 165, 233, 0.2);
}

html.dark .form-input {
	border-color: var(--border-color-dark);
	background-color: var(--input-bg-dark);
	color: var(--text-color-dark);
}

#to-value {
	font-weight: 600;
	cursor: default;
}

footer {
	font-size: 0.75rem;
	padding-left: 0.5rem;
	padding-right: 0.5rem;
}

footer .social-links,
footer .copyright {
	margin-bottom: 0.5rem;
}

footer .social-links .social-link {
	margin-left: 0.5rem;
	text-decoration: none;
}

svg.icon {
	width: 1rem;
	height: 1rem;
	fill: var(--text-color-light);
}

html.dark svg.icon {
	fill: var(--text-color-dark);
}

/* Buttons */
.icon-button {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: 0.5rem;
	border-radius: 9999px;
	border: none;
	background-color: transparent;
	cursor: pointer;
	-webkit-transition: background-color 0.2s ease;
	transition: background-color 0.2s ease;
}

.icon-button:hover {
	background-color: rgba(0, 0, 0, 0.05);
}

html.dark .icon-button:hover {
	background-color: rgba(255, 255, 255, 0.1);
}

.icon-button:focus {
	outline: none;
	box-shadow: 0 0 0 2px var(--sky-500);
}

.icon-button svg {
	width: 1.5rem;
	height: 1.5rem;
	stroke: var(--secondary-text-light);
}

html.dark .icon-button svg {
	stroke: var(--secondary-text-dark);
}

#swap-btn {
	background-color: var(--sky-500);
	color: white;
	padding: 0.75rem;
	margin-top: 1.5rem;
	-webkit-transition: background-color 0.2s ease, transform 0.3s ease;
	transition: background-color 0.2s ease, transform 0.3s ease;
}

#swap-btn:hover {
	background-color: var(--sky-600);
	transform: rotate(180deg);
}

#swap-btn svg {
	stroke: white;
}


#copy-btn {
	position: absolute;
	top: 50%;
	right: 0.25rem;
	transform: translateY(-50%);
	padding: 0.5rem;
}

#copy-btn svg {
	width: 1.25rem;
	height: 1.25rem;
}

#copy-btn:hover svg {
	stroke: var(--sky-500);
}

footer {
	text-align: center;
	margin-top: 0.5rem;
	color: var(--secondary-text-light);
}

html.dark footer {
	color: var(--secondary-text-dark);
}

/* Choices.js Custom Theme */
.choices {
	--choices-bg: var(--input-bg-light);
	--choices-border: var(--border-color-light);
	--choices-text: var(--text-color-light);
	--choices-item-bg: var(--bg-light);
	--choices-item-text: var(--text-color-light);
	--choices-highlight-text: var(--text-color-light);
	--choices-highlight-bg: var(--sky-500);
	--choices-dropdown-bg: var(--card-bg-light);
	--choices-dropdown-border: var(--border-color-light);
}

html.dark .choices {
	--choices-bg: var(--input-bg-dark);
	--choices-border: var(--border-color-dark);
	--choices-text: var(--text-color-dark);
	--choices-item-bg: var(--bg-dark);
	--choices-item-text: var(--text-color-dark);
	--choices-highlight-text: var(--text-color-light);
	--choices-highlight-bg: var(--bg-dark);
	--choices-dropdown-bg: var(--card-bg-dark);
	--choices-dropdown-border: var(--border-color-dark);
}

.choices__inner {
	background-color: var(--choices-bg);
	border-radius: 0.5rem;
	border: 1px solid var(--choices-border);
	min-height: 3.5rem;
	line-height: 1;
	padding: 0.5rem 1rem;
	font-size: 1rem;
	-webkit-transition: all 0.2s ease;
	transition: all 0.2s ease;
}

.is-focused .choices__inner {
	border-color: var(--sky-500);
	box-shadow: 0 0 0 2px rgba(14, 165, 233, 0.2);
}

.choices__list--dropdown,
.choices__list[aria-expanded] {
	background-color: var(--choices-dropdown-bg);
	border-color: var(--choices-dropdown-border);
	border-radius: 0.5rem;
}

.choices__list--single {
	padding: 0;
}

.choices__input {
	background-color: var(--choices-bg) !important;
	color: var(--choices-text) !important;
}

.choices__item {
	color: var(--choices-text);
}

.choices__item--selectable.is-highlighted {
	background-color: var(--choices-highlight-bg);
	color: var(--choices-highlight-text);
}

.choices__list--single .choices__item{
	line-height: 2.6rem;
}

.choices[data-type*=select-one]::after {
	border-color: var(--choices-text) transparent transparent;
}

/* Custom Notifier Styles */
.notifier-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.notifier {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    margin-bottom: 10px;
    color: #fff;
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    min-width: 250px;
    opacity: 0;
    transform: translateX(100%);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.notifier.show {
    opacity: 1;
    transform: translateX(0);
}

.notifier.hide {
    opacity: 0;
    transform: translateX(100%);
}

.notifier-icon {
    margin-right: 10px;
    width: 20px;
    height: 20px;
}

/* Success State */
.notifier.success {
    background-color: #28a745; /* Green */
}

/* Error State */
.notifier.error {
    background-color: #dc3545; /* Red */
}


@media (min-width: 768px) {
	main{
		display: flex;
		display: -ms-flexbox;
		-ms-flex-pack: center;
    	justify-content: center;
		-ms-flex-align: center;
    	align-items: center;
	}
	footer .container{
		display: -ms-flexbox;
		display: flex;
		-ms-flex-pack: justify;
		justify-content: space-between;
		-ms-flex-align: center;
	}
	.conversion-grid {
		grid-template-columns: 2fr 1fr 2fr;
	}

	#swap-btn {
		margin-top: 1.75rem;
	}
}

@media (min-width: 768px) and (min-height:420px) {
	main{
		display: flex;
		display: -ms-flexbox;
		-ms-flex-pack: center;
    	justify-content: center;
		-ms-flex-align: center;
    	align-items: center;
	}
}

@media (max-width: 768px) and (min-height: 660px) {
	main{
		display: flex;
		display: -ms-flexbox;
		-ms-flex-pack: center;
    	justify-content: center;
		-ms-flex-align: center;
    	align-items: center;
	}
}