/* ==========================================================================
   Lampert Ringguss-Kalkulator – Styles
   ========================================================================== */

/* Variables */
:root {
	--lrk-primary: #009EE3;
	--lrk-primary-dark: #0080b8;
	--lrk-text: #3b3a3c;
	--lrk-bg: #f2f2f2;
	--lrk-white: #ffffff;
	--lrk-border: #dcdcdc;
	--lrk-error: #d32f2f;
	--lrk-hint: #777777;
	--lrk-radius: 6px;
	--lrk-font: 'Roboto', sans-serif;
}

/* Container */
.lrk-kalkulator {
	font-family: var(--lrk-font);
	color: var(--lrk-text);
	background: var(--lrk-bg);
	border-radius: var(--lrk-radius);
	max-width: 800px;
	margin: 2rem auto;
	padding: 0;
	line-height: 1.5;
	box-sizing: border-box;
}

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

/* ==========================================================================
   Tabs
   ========================================================================== */

.lrk-tabs {
	display: flex;
	border-bottom: 2px solid var(--lrk-border);
	background: var(--lrk-white);
	border-radius: var(--lrk-radius) var(--lrk-radius) 0 0;
	overflow: hidden;
}

.lrk-tab {
	flex: 1;
	padding: 1rem 1.25rem;
	border: 1px solid var(--lrk-border);
	background: none;
	font-family: var(--lrk-font);
	font-size: 0.95rem;
	font-weight: 500;
	color: var(--lrk-hint);
	cursor: pointer;
	position: relative;
	transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
	text-align: center;
	outline: none;
	-webkit-user-select: none;
	user-select: none;
}

.lrk-tab:first-child {
	border-radius: var(--lrk-radius) 0 0 0;
}

.lrk-tab:last-child {
	border-radius: 0 var(--lrk-radius) 0 0;
}

.lrk-tab:hover {
	color: var(--lrk-text);
}

.lrk-tab--active {
	color: var(--lrk-white);
	font-weight: 600;
	background: var(--lrk-primary);
	border-color: var(--lrk-primary);
}

.lrk-tab--active:hover {
	color: var(--lrk-white);
}

.lrk-tab:focus-visible {
	outline: 2px solid var(--lrk-primary);
	outline-offset: -2px;
}

.lrk-tab--active:focus-visible {
	outline-color: var(--lrk-white);
}

/* ==========================================================================
   Panels
   ========================================================================== */

.lrk-panel {
	padding: 1.5rem;
}

.lrk-panel[hidden] {
	display: none;
}

.lrk-panel__intro {
	font-size: 1.05rem;
	color: var(--lrk-primary);
	font-weight: 700;
	margin: 0 0 1.25rem 0;
}

/* ==========================================================================
   Form Grid
   ========================================================================== */

.lrk-form {
	margin: 0;
}

.lrk-form__grid {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 1rem 1.5rem;
}

/* ==========================================================================
   Fields
   ========================================================================== */

.lrk-field {
	display: flex;
	flex-direction: column;
}

.lrk-label {
	font-size: 0.85rem;
	font-weight: 600;
	margin-bottom: 0.35rem;
	display: flex;
	align-items: center;
	gap: 0.5rem;
}

.lrk-input,
.lrk-select {
	font-family: var(--lrk-font);
	font-size: 1rem;
	padding: 0.6rem 0.75rem;
	border: 1px solid var(--lrk-border);
	border-radius: var(--lrk-radius);
	background: var(--lrk-white);
	color: var(--lrk-text);
	width: 100%;
	transition: border-color 0.2s ease, box-shadow 0.2s ease;
	-moz-appearance: textfield;
}

.lrk-input::-webkit-outer-spin-button,
.lrk-input::-webkit-inner-spin-button {
	-webkit-appearance: none;
	margin: 0;
}

.lrk-input:focus,
.lrk-select:focus {
	outline: none;
	border-color: var(--lrk-primary);
	box-shadow: 0 0 0 3px rgba(0, 158, 227, 0.15);
}

.lrk-input--error,
.lrk-select--error {
	border-color: var(--lrk-error);
}

.lrk-input--error:focus,
.lrk-select--error:focus {
	box-shadow: 0 0 0 3px rgba(211, 47, 47, 0.15);
}

.lrk-input--calculated {
	background: #e8f6fd;
	border-color: var(--lrk-primary);
}

.lrk-hint {
	font-size: 0.75rem;
	color: var(--lrk-hint);
	margin-top: 0.2rem;
}

.lrk-error {
	font-size: 0.75rem;
	color: var(--lrk-error);
	margin-top: 0.2rem;
	min-height: 1.1em;
}

/* ==========================================================================
   Stepper (numeric input with +/- buttons)
   ========================================================================== */

.lrk-stepper {
	display: flex;
	align-items: stretch;
	border: 1px solid var(--lrk-border);
	border-radius: var(--lrk-radius);
	background: var(--lrk-white);
	overflow: hidden;
	transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.lrk-stepper:focus-within {
	border-color: var(--lrk-primary);
	box-shadow: 0 0 0 3px rgba(0, 158, 227, 0.15);
}

.lrk-stepper__btn {
	display: flex;
	align-items: center;
	justify-content: center;
	width: 2.5rem;
	background: var(--lrk-bg);
	color: var(--lrk-primary);
	font-size: 1.25rem;
	font-weight: 700;
	line-height: 1;
	cursor: pointer;
	transition: background 0.2s ease, color 0.2s ease;
	-webkit-user-select: none;
	user-select: none;
}

.lrk-stepper__btn:hover,
.lrk-stepper__btn:focus {
	background: var(--lrk-primary);
	color: var(--lrk-white);
	outline: none;
}

.lrk-stepper .lrk-input {
	flex: 1;
	border: none;
	border-radius: 0;
	text-align: center;
	background: transparent;
	min-width: 0;
}

.lrk-stepper .lrk-input:focus {
	box-shadow: none;
}

/* ==========================================================================
   Tooltips
   ========================================================================== */

.lrk-tooltip {
	position: relative;
	display: inline-flex;
	align-items: center;
}

.lrk-tooltip__trigger {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 18px;
	height: 18px;
	border-radius: 50%;
	border: 1px solid var(--lrk-primary);
	background: var(--lrk-primary);
	color: var(--lrk-white);
	font-size: 0.7rem;
	font-weight: 700;
	font-family: var(--lrk-font);
	cursor: pointer;
	padding: 0;
	line-height: 1;
	transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
	-webkit-user-select: none;
	user-select: none;
}

.lrk-tooltip__trigger:hover,
.lrk-tooltip__trigger:focus {
	background: var(--lrk-primary-dark);
	color: var(--lrk-white);
	border-color: var(--lrk-primary-dark);
	outline: none;
}

.lrk-tooltip__content {
	display: none;
	position: absolute;
	bottom: calc(100% + 8px);
	left: 50%;
	transform: translateX(-50%);
	background: var(--lrk-text);
	color: var(--lrk-white);
	font-size: 0.75rem;
	font-weight: 400;
	line-height: 1.4;
	padding: 0.5rem 0.75rem;
	border-radius: 4px;
	width: max-content;
	max-width: 220px;
	z-index: 100;
	pointer-events: none;
}

.lrk-tooltip__content::after {
	content: '';
	position: absolute;
	top: 100%;
	left: 50%;
	transform: translateX(-50%);
	border: 5px solid transparent;
	border-top-color: var(--lrk-text);
}

.lrk-tooltip__trigger:hover + .lrk-tooltip__content,
.lrk-tooltip__trigger:focus + .lrk-tooltip__content {
	display: block;
}

@media (max-width: 600px) {
	.lrk-tooltip__content {
		left: auto;
		right: -8px;
		transform: none;
		max-width: 180px;
	}

	.lrk-tooltip__content::after {
		left: auto;
		right: 12px;
		transform: none;
	}
}

/* ==========================================================================
   Badge (calculated indicator)
   ========================================================================== */

.lrk-badge--calculated {
	font-size: 0.7rem;
	font-weight: 400;
	background: var(--lrk-primary);
	color: var(--lrk-white);
	padding: 0.1rem 0.4rem;
	border-radius: 3px;
	text-transform: uppercase;
	letter-spacing: 0.03em;
}

.lrk-badge--calculated[hidden] {
	display: none;
}

/* ==========================================================================
   Result
   ========================================================================== */

.lrk-result {
	margin-top: 1.5rem;
	background: var(--lrk-white);
	border-radius: var(--lrk-radius);
	padding: 1.25rem 1.5rem;
	text-align: center;
	border: 2px solid var(--lrk-primary);
}

.lrk-result__label {
	display: block;
	font-size: 0.85rem;
	font-weight: 500;
	color: var(--lrk-hint);
	text-transform: uppercase;
	letter-spacing: 0.05em;
	margin-bottom: 0.25rem;
}

.lrk-result__value {
	display: block;
	font-size: 2.5rem;
	font-weight: 700;
	color: var(--lrk-primary);
	line-height: 1.2;
}

.lrk-result__unit {
	display: block;
	font-size: 0.9rem;
	color: var(--lrk-hint);
}

/* ==========================================================================
   Bidirectional Section (Tab 2)
   ========================================================================== */

.lrk-bidir {
	margin-top: 1.5rem;
	background: var(--lrk-white);
	border-radius: var(--lrk-radius);
	padding: 1.25rem 1.5rem;
}

.lrk-bidir__intro {
	font-size: 0.85rem;
	color: var(--lrk-hint);
	margin: 0 0 1rem 0;
}

.lrk-bidir__fields {
	display: flex;
	align-items: flex-start;
	gap: 1rem;
}

.lrk-bidir__field {
	flex: 1;
}

.lrk-bidir__arrow {
	font-size: 1.5rem;
	color: var(--lrk-primary);
	padding-top: 1.75rem;
	flex-shrink: 0;
	user-select: none;
}

/* ==========================================================================
   Select optgroup styling
   ========================================================================== */

.lrk-select optgroup {
	font-weight: 600;
	color: var(--lrk-text);
}

.lrk-select option {
	font-weight: 400;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 600px) {
	.lrk-kalkulator {
		margin: 1rem 0;
		border-radius: 0;
	}

	.lrk-tabs {
		border-radius: 0;
	}

	.lrk-tab {
		padding: 0.75rem 0.5rem;
		font-size: 0.85rem;
	}

	.lrk-panel {
		padding: 1rem;
	}

	.lrk-form__grid {
		grid-template-columns: 1fr;
		gap: 0.75rem;
	}

	.lrk-bidir__fields {
		flex-direction: column;
		align-items: stretch;
	}

	.lrk-bidir__arrow {
		text-align: center;
		padding: 0;
		transform: rotate(90deg);
	}

	.lrk-result__value {
		font-size: 2rem;
	}
}