/* =============================================================================
   Lagersystem — app.css
   Mobile-first admin stylesheet.
   No external dependencies. No framework. Pure CSS.
   ============================================================================= */

/* -----------------------------------------------------------------------------
   Custom properties (design tokens)
   ----------------------------------------------------------------------------- */
:root {
	/* Colours */
	--color-primary:        #2563eb;
	--color-primary-dark:   #1d4ed8;
	--color-primary-light:  #eff6ff;

	--color-success:        #16a34a;
	--color-success-light:  #f0fdf4;
	--color-warning:        #d97706;
	--color-warning-light:  #fffbeb;
	--color-danger:         #dc2626;
	--color-danger-light:   #fef2f2;
	--color-info:           #0891b2;
	--color-info-light:     #ecfeff;

	--color-text:           #111827;
	--color-text-muted:     #6b7280;
	--color-text-light:     #9ca3af;

	--color-bg:             #f9fafb;
	--color-surface:        #ffffff;
	--color-border:         #e5e7eb;
	--color-border-focus:   #2563eb;

	/* Stock level colours */
	--color-stock-ok:       #16a34a;
	--color-stock-low:      #d97706;
	--color-stock-empty:    #dc2626;

	/* Typography */
	--font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
	--font-mono: ui-monospace, 'Cascadia Code', 'Fira Mono', monospace;

	--text-xs:   0.75rem;
	--text-sm:   0.875rem;
	--text-base: 1rem;
	--text-lg:   1.125rem;
	--text-xl:   1.25rem;
	--text-2xl:  1.5rem;
	--text-3xl:  1.875rem;

	/* Spacing */
	--space-1: 0.25rem;
	--space-2: 0.5rem;
	--space-3: 0.75rem;
	--space-4: 1rem;
	--space-5: 1.25rem;
	--space-6: 1.5rem;
	--space-8: 2rem;
	--space-10: 2.5rem;
	--space-12: 3rem;

	/* Borders */
	--radius-sm: 0.25rem;
	--radius:    0.375rem;
	--radius-lg: 0.5rem;
	--radius-xl: 0.75rem;

	/* Shadows */
	--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
	--shadow:    0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
	--shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);

	/* Layout */
	--nav-height: 3.5rem;
	--container-max: 72rem;
	--container-pad: var(--space-4);
}

/* -----------------------------------------------------------------------------
   Reset & base
   ----------------------------------------------------------------------------- */
*, *::before, *::after {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

html {
	font-size: 16px;
	-webkit-text-size-adjust: 100%;
	scroll-behavior: smooth;
}

body {
	font-family: var(--font-sans);
	font-size: var(--text-base);
	line-height: 1.6;
	color: var(--color-text);
	background-color: var(--color-bg);
	min-height: 100vh;
}

img, svg {
	display: block;
	max-width: 100%;
}

a {
	color: var(--color-primary);
	text-decoration: none;
}

a:hover {
	text-decoration: underline;
}

ul, ol {
	list-style: none;
}

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

/* -----------------------------------------------------------------------------
   Layout — container, page structure
   ----------------------------------------------------------------------------- */
.container {
	width: 100%;
	max-width: var(--container-max);
	margin-inline: auto;
	padding-inline: var(--container-pad);
}

.site-main {
	padding-top: calc(var(--nav-height) + var(--space-6));
	padding-bottom: var(--space-12);
	min-height: 100vh;
}

.site-footer {
	border-top: 1px solid var(--color-border);
	padding-block: var(--space-4);
	margin-top: var(--space-8);
}

.site-footer__text {
	font-size: var(--text-sm);
	color: var(--color-text-muted);
	text-align: center;
}

/* -----------------------------------------------------------------------------
   Navigation
   ----------------------------------------------------------------------------- */
.site-header {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	z-index: 100;
	height: var(--nav-height);
	background: var(--color-surface);
	border-bottom: 1px solid var(--color-border);
	box-shadow: var(--shadow-sm);
}

.nav-inner {
	display: flex;
	align-items: center;
	height: 100%;
	max-width: var(--container-max);
	margin-inline: auto;
	padding-inline: var(--container-pad);
	gap: var(--space-4);
}

.nav-brand {
	flex-shrink: 0;
}

.nav-logo {
	display: flex;
	align-items: center;
	gap: var(--space-2);
	font-weight: 700;
	font-size: var(--text-lg);
	color: var(--color-text);
	text-decoration: none;
}

.nav-logo svg {
	color: var(--color-primary);
}

/* Hamburger button — visible on mobile only */
.nav-toggle {
	display: flex;
	flex-direction: column;
	justify-content: center;
	gap: 5px;
	width: 2.5rem;
	height: 2.5rem;
	padding: var(--space-2);
	margin-left: auto;
	background: none;
	border: none;
	cursor: pointer;
	border-radius: var(--radius);
}

.nav-toggle:focus-visible {
	outline: 2px solid var(--color-primary);
	outline-offset: 2px;
}

.nav-toggle__bar {
	display: block;
	width: 100%;
	height: 2px;
	background: var(--color-text);
	border-radius: 2px;
	transition: transform 0.2s, opacity 0.2s;
}

/* Nav links — stacked dropdown on mobile */
.nav-links {
	display: none;
	flex-direction: column;
	position: absolute;
	top: var(--nav-height);
	left: 0;
	right: 0;
	background: var(--color-surface);
	border-bottom: 1px solid var(--color-border);
	box-shadow: var(--shadow-md);
	padding: var(--space-4);
	gap: var(--space-1);
}

.nav-links.is-open {
	display: flex;
}

.nav-link {
	display: block;
	padding: var(--space-3) var(--space-4);
	border-radius: var(--radius);
	font-size: var(--text-sm);
	font-weight: 500;
	color: var(--color-text);
	text-decoration: none;
	transition: background 0.15s, color 0.15s;
}

.nav-link:hover {
	background: var(--color-bg);
	text-decoration: none;
}

.nav-link--active {
	background: var(--color-primary-light);
	color: var(--color-primary);
}

.nav-divider {
	height: 1px;
	background: var(--color-border);
	margin-block: var(--space-2);
}

.nav-user {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: var(--space-2) var(--space-4);
	gap: var(--space-4);
}

.nav-user__name {
	font-size: var(--text-sm);
	font-weight: 500;
	color: var(--color-text-muted);
}

.nav-user__logout {
	display: contents;
}

/* Desktop nav — horizontal */
@media (min-width: 768px) {
	.nav-toggle {
		display: none;
	}

	.nav-links {
		display: flex;
		flex-direction: row;
		align-items: center;
		position: static;
		background: none;
		border: none;
		box-shadow: none;
		padding: 0;
		gap: var(--space-1);
		flex: 1;
	}

	.nav-link {
		font-size: var(--text-sm);
		padding: var(--space-2) var(--space-3);
		white-space: nowrap;
	}

	.nav-divider {
		width: 1px;
		height: 1.5rem;
		margin-inline: var(--space-2);
		margin-block: 0;
	}

	.nav-user {
		margin-left: auto;
		padding: 0;
		gap: var(--space-3);
	}
}

/* -----------------------------------------------------------------------------
   Bare layout (login page)
   ----------------------------------------------------------------------------- */
.body--bare {
	background: var(--color-bg);
	display: flex;
	flex-direction: column;
	min-height: 100vh;
}

.bare-main {
	flex: 1;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	padding: var(--space-6) var(--space-4);
}

/* Login card */
.login-wrap {
	width: 100%;
	max-width: 26rem;
}

.login-card {
	background: var(--color-surface);
	border: 1px solid var(--color-border);
	border-radius: var(--radius-xl);
	box-shadow: var(--shadow-md);
	padding: var(--space-8);
}

.login-card__header {
	text-align: center;
	margin-bottom: var(--space-6);
}

.login-card__logo {
	display: flex;
	justify-content: center;
	margin-bottom: var(--space-4);
	color: var(--color-primary);
}

.login-card__title {
	font-size: var(--text-2xl);
	font-weight: 700;
	color: var(--color-text);
}

.login-card__subtitle {
	margin-top: var(--space-1);
	font-size: var(--text-sm);
	color: var(--color-text-muted);
}

.login-card__form {
	display: flex;
	flex-direction: column;
	gap: var(--space-5);
}

/* -----------------------------------------------------------------------------
   Cards
   ----------------------------------------------------------------------------- */
.card {
	background: var(--color-surface);
	border: 1px solid var(--color-border);
	border-radius: var(--radius-lg);
	box-shadow: var(--shadow-sm);
}

.card__body {
	padding: var(--space-5) var(--space-6);
}

.card__header {
	padding: var(--space-4) var(--space-6);
	border-bottom: 1px solid var(--color-border);
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--space-4);
}

.card__title {
	font-size: var(--text-base);
	font-weight: 600;
}

.card__footer {
	padding: var(--space-4) var(--space-6);
	border-top: 1px solid var(--color-border);
	background: var(--color-bg);
	border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.card--link {
	text-decoration: none;
	color: inherit;
	cursor: pointer;
	transition: box-shadow 0.15s, border-color 0.15s;
}

.card--link:hover {
	border-color: var(--color-primary);
	box-shadow: var(--shadow-md);
	text-decoration: none;
}

/* -----------------------------------------------------------------------------
   Grid
   ----------------------------------------------------------------------------- */
.grid {
	display: grid;
	gap: var(--space-4);
	grid-template-columns: 1fr;
}

@media (min-width: 640px) {
	.grid--2,
	.grid--3,
	.grid--4 {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media (min-width: 1024px) {
	.grid--3 {
		grid-template-columns: repeat(3, 1fr);
	}
	.grid--4 {
		grid-template-columns: repeat(4, 1fr);
	}
}

/* -----------------------------------------------------------------------------
   Forms
   ----------------------------------------------------------------------------- */
.form-group {
	display: flex;
	flex-direction: column;
	gap: var(--space-2);
}

.form-label {
	font-size: var(--text-sm);
	font-weight: 600;
	color: var(--color-text);
}

.form-label--optional::after {
	content: ' (valgfri)';
	font-weight: 400;
	color: var(--color-text-muted);
}

.form-input,
.form-select,
.form-textarea {
	width: 100%;
	padding: var(--space-3) var(--space-4);
	font-size: var(--text-base);
	line-height: 1.5;
	color: var(--color-text);
	background: var(--color-surface);
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
	transition: border-color 0.15s, box-shadow 0.15s;
	appearance: none;
	-webkit-appearance: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
	outline: none;
	border-color: var(--color-border-focus);
	box-shadow: 0 0 0 3px rgb(37 99 235 / 0.15);
}

.form-input--error,
.form-select--error,
.form-textarea--error {
	border-color: var(--color-danger);
}

.form-input--error:focus,
.form-select--error:focus {
	box-shadow: 0 0 0 3px rgb(220 38 38 / 0.15);
}

.form-textarea {
	resize: vertical;
	min-height: 6rem;
}

.form-hint {
	font-size: var(--text-xs);
	color: var(--color-text-muted);
}

.form-error {
	font-size: var(--text-xs);
	color: var(--color-danger);
}

/* Select arrow */
.form-select {
	background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
	background-repeat: no-repeat;
	background-position: right var(--space-3) center;
	padding-right: var(--space-10);
}

/* Form row — horizontal fields on wider screens */
.form-row {
	display: grid;
	grid-template-columns: 1fr;
	gap: var(--space-4);
}

@media (min-width: 640px) {
	.form-row--2 {
		grid-template-columns: 1fr 1fr;
	}
	.form-row--3 {
		grid-template-columns: 1fr 1fr 1fr;
	}
}

.form-actions {
	display: flex;
	flex-wrap: wrap;
	gap: var(--space-3);
	padding-top: var(--space-2);
}

/* -----------------------------------------------------------------------------
   Buttons
   Mobile: full-width by default, min tap target 44px
   ----------------------------------------------------------------------------- */
.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: var(--space-2);
	padding: var(--space-3) var(--space-5);
	min-height: 2.75rem;
	font-size: var(--text-sm);
	font-weight: 600;
	line-height: 1;
	border: 1px solid transparent;
	border-radius: var(--radius);
	cursor: pointer;
	text-decoration: none;
	transition: background 0.15s, border-color 0.15s, box-shadow 0.15s, color 0.15s;
	white-space: nowrap;
	user-select: none;
}

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

.btn:disabled {
	opacity: 0.5;
	cursor: not-allowed;
}

/* Variants */
.btn--primary {
	background: var(--color-primary);
	color: #fff;
	border-color: var(--color-primary);
}
.btn--primary:hover:not(:disabled) {
	background: var(--color-primary-dark);
	border-color: var(--color-primary-dark);
	text-decoration: none;
}

.btn--secondary {
	background: var(--color-surface);
	color: var(--color-text);
	border-color: var(--color-border);
}
.btn--secondary:hover:not(:disabled) {
	background: var(--color-bg);
	text-decoration: none;
}

.btn--danger {
	background: var(--color-danger);
	color: #fff;
	border-color: var(--color-danger);
}
.btn--danger:hover:not(:disabled) {
	background: #b91c1c;
	border-color: #b91c1c;
	text-decoration: none;
}

.btn--ghost {
	background: transparent;
	color: var(--color-text);
	border-color: transparent;
}
.btn--ghost:hover:not(:disabled) {
	background: var(--color-bg);
	text-decoration: none;
}

/* Sizes */
.btn--sm {
	padding: var(--space-2) var(--space-3);
	min-height: 2rem;
	font-size: var(--text-xs);
}

.btn--lg {
	padding: var(--space-4) var(--space-6);
	min-height: 3rem;
	font-size: var(--text-base);
}

.btn--full {
	width: 100%;
}

/* -----------------------------------------------------------------------------
   Tables
   Mobile: horizontal scroll wrapper
   ----------------------------------------------------------------------------- */
.table-wrap {
	overflow-x: auto;
	-webkit-overflow-scrolling: touch;
	border: 1px solid var(--color-border);
	border-radius: var(--radius-lg);
}

.table {
	width: 100%;
	border-collapse: collapse;
	font-size: var(--text-sm);
}

.table th,
.table td {
	padding: var(--space-3) var(--space-4);
	text-align: left;
	border-bottom: 1px solid var(--color-border);
}

.table th {
	font-weight: 600;
	font-size: var(--text-xs);
	text-transform: uppercase;
	letter-spacing: 0.05em;
	color: var(--color-text-muted);
	background: var(--color-bg);
	white-space: nowrap;
}

.table tbody tr:last-child td {
	border-bottom: none;
}

.table tbody tr:hover td {
	background: var(--color-bg);
}

.table td.td--num {
	text-align: right;
	font-variant-numeric: tabular-nums;
	font-family: var(--font-mono);
}

.table td.td--actions {
	text-align: right;
	white-space: nowrap;
}

/* -----------------------------------------------------------------------------
   Alerts
   ----------------------------------------------------------------------------- */
.alert {
	padding: var(--space-4);
	border-radius: var(--radius);
	border: 1px solid transparent;
	font-size: var(--text-sm);
}

.alert p + p {
	margin-top: var(--space-1);
}

.alert--success {
	background: var(--color-success-light);
	border-color: var(--color-success);
	color: #14532d;
}

.alert--error {
	background: var(--color-danger-light);
	border-color: var(--color-danger);
	color: #7f1d1d;
}

.alert--warning {
	background: var(--color-warning-light);
	border-color: var(--color-warning);
	color: #78350f;
}

.alert--info {
	background: var(--color-info-light);
	border-color: var(--color-info);
	color: #164e63;
}

/* Flash messages (dismissible) */
.flash-container {
	display: flex;
	flex-direction: column;
	gap: var(--space-2);
	margin-bottom: var(--space-4);
}

.flash {
	display: flex;
	align-items: flex-start;
	justify-content: space-between;
	gap: var(--space-3);
	padding: var(--space-3) var(--space-4);
	border-radius: var(--radius);
	border: 1px solid transparent;
	font-size: var(--text-sm);
}

.flash--success {
	background: var(--color-success-light);
	border-color: var(--color-success);
	color: #14532d;
}

.flash--error {
	background: var(--color-danger-light);
	border-color: var(--color-danger);
	color: #7f1d1d;
}

.flash--warning {
	background: var(--color-warning-light);
	border-color: var(--color-warning);
	color: #78350f;
}

.flash--info {
	background: var(--color-info-light);
	border-color: var(--color-info);
	color: #164e63;
}

.flash__close {
	flex-shrink: 0;
	background: none;
	border: none;
	cursor: pointer;
	font-size: var(--text-lg);
	line-height: 1;
	color: inherit;
	opacity: 0.6;
	padding: 0 var(--space-1);
}

.flash__close:hover {
	opacity: 1;
}

/* -----------------------------------------------------------------------------
   Badges
   ----------------------------------------------------------------------------- */
.badge {
	display: inline-flex;
	align-items: center;
	padding: 2px var(--space-2);
	border-radius: var(--radius-sm);
	font-size: var(--text-xs);
	font-weight: 600;
	letter-spacing: 0.02em;
	white-space: nowrap;
}

.badge-success {
	background: var(--color-success-light);
	color: var(--color-success);
}

.badge-warning {
	background: var(--color-warning-light);
	color: var(--color-warning);
}

.badge-danger {
	background: var(--color-danger-light);
	color: var(--color-danger);
}

.badge-info {
	background: var(--color-info-light);
	color: var(--color-info);
}

.badge-neutral {
	background: var(--color-bg);
	color: var(--color-text-muted);
	border: 1px solid var(--color-border);
}

/* -----------------------------------------------------------------------------
   Stock level indicators
   ----------------------------------------------------------------------------- */
.stock-ok    { color: var(--color-stock-ok); font-weight: 600; }
.stock-low   { color: var(--color-stock-low); font-weight: 600; }
.stock-empty { color: var(--color-stock-empty); font-weight: 600; }

/* Movement quantity colours */
.qty-positive { color: var(--color-success); font-weight: 600; }
.qty-negative { color: var(--color-danger); font-weight: 600; }

/* -----------------------------------------------------------------------------
   Page header
   ----------------------------------------------------------------------------- */
.page-header {
	display: flex;
	align-items: flex-start;
	justify-content: space-between;
	flex-wrap: wrap;
	gap: var(--space-4);
	margin-bottom: var(--space-6);
}

.page-title {
	font-size: var(--text-2xl);
	font-weight: 700;
	color: var(--color-text);
	line-height: 1.2;
}

.page-subtitle {
	font-size: var(--text-sm);
	color: var(--color-text-muted);
	margin-top: var(--space-1);
}

.page-header__actions {
	display: flex;
	flex-wrap: wrap;
	gap: var(--space-2);
	flex-shrink: 0;
}

/* -----------------------------------------------------------------------------
   Dashboard tiles
   ----------------------------------------------------------------------------- */
.dashboard-tile {
	text-align: center;
	padding: var(--space-2) 0;
}

.dashboard-tile__icon {
	font-size: 2rem;
	margin-bottom: var(--space-2);
}

.dashboard-tile__label {
	font-size: var(--text-base);
	font-weight: 600;
	color: var(--color-text);
}

.dashboard-tile__desc {
	margin-top: var(--space-1);
	font-size: var(--text-sm);
	color: var(--color-text-muted);
}

/* -----------------------------------------------------------------------------
   Utility classes
   ----------------------------------------------------------------------------- */
.mt-1  { margin-top: var(--space-1); }
.mt-2  { margin-top: var(--space-2); }
.mt-3  { margin-top: var(--space-3); }
.mt-4  { margin-top: var(--space-4); }
.mt-6  { margin-top: var(--space-6); }
.mt-8  { margin-top: var(--space-8); }
.mb-4  { margin-bottom: var(--space-4); }
.mb-6  { margin-bottom: var(--space-6); }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }

.text-sm    { font-size: var(--text-sm); }
.text-lg    { font-size: var(--text-lg); }
.text-muted { color: var(--color-text-muted); }
.text-right { text-align: right; }
.text-center { text-align: center; }

.font-mono  { font-family: var(--font-mono); }
.font-bold  { font-weight: 700; }

.d-flex     { display: flex; }
.flex-wrap  { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }

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

.text-danger  { color: var(--color-danger); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }

.w-full { width: 100%; }