/* ============================================================
   Klara Survey — design tokens, fonts, global resets.
   Visual identity: black-first, monospace-led, minimal chrome.
   ============================================================ */

/* ---- Self-hosted Atkinson Hyperlegible (Regular + Bold, woff2 only) ----
   Atkinson Hyperlegible is designed for low-vision readers and people with
   reading disorders — letterforms are distinct and unambiguous (no I/l/1
   confusion, no 0/O confusion, etc.). Perfect for a research-survey site.
   Files come from the Fontsource project on jsDelivr (NOT Google Fonts),
   subsetted to Latin so the total payload is ~35 KB across both weights. */
@font-face {
	font-family: 'Atkinson Hyperlegible';
	font-style: normal;
	font-weight: 400;
	font-display: swap;
	src: url('fonts/AtkinsonHyperlegible-Regular.woff2') format('woff2');
	unicode-range: U+0000-007F, U+00A0-024F, U+1E00-1EFF, U+2000-206F, U+2070-209F, U+20A0-20CF;
}
@font-face {
	font-family: 'Atkinson Hyperlegible';
	font-style: normal;
	font-weight: 700;
	font-display: swap;
	src: url('fonts/AtkinsonHyperlegible-Bold.woff2') format('woff2');
	unicode-range: U+0000-007F, U+00A0-024F, U+1E00-1EFF, U+2000-206F, U+2070-209F, U+20A0-20CF;
}

:root {
	color-scheme: light;
	--viewport-height: 100vh;
	--safe-area-top: env(safe-area-inset-top, 0px);
	--safe-area-bottom: env(safe-area-inset-bottom, 0px);
	--safe-area-left: env(safe-area-inset-left, 0px);
	--safe-area-right: env(safe-area-inset-right, 0px);
	--page-max: 1320px;
	--page-gutter: clamp(1rem, 4vw, 2.5rem);
	--page-gutter-compact: clamp(1rem, 3vw, 1.75rem);
	--touch-target-min: 44px;

	/* ---- Light theme — DEFAULT for everyone. Users can switch via the
	     theme toggle and their choice persists in localStorage. ---- */
	--bg: #fafafa;
	--bg-elevated: #ffffff;
	--bg-muted: #f4f4f5;
	--bg-contrast: #e4e4e7;
	--bg-overlay: rgba(15, 15, 15, 0.45);

	--text: #09090b;
	--text-muted: #52525b;
	--text-dim: #71717a;

	--border: rgba(9, 9, 11, 0.08);
	--border-strong: rgba(9, 9, 11, 0.2);
	--border-focus: rgba(109, 40, 217, 0.5);

	--shadow: 0 1px 0 rgba(9, 9, 11, 0.04), 0 6px 18px rgba(9, 9, 11, 0.06);
	--shadow-hover: 0 1px 0 rgba(9, 9, 11, 0.08), 0 14px 36px rgba(9, 9, 11, 0.12);

	--accent: #6d28d9;
	--accent-strong: #5b21b6;
	--accent-deep: #4c1d95;
	--accent-soft: rgba(109, 40, 217, 0.10);
	--accent-glow: rgba(109, 40, 217, 0.18);
	--text-on-accent: #ffffff;

	--success: #15803d;
	--error: #be123c;
	--warning: #b45309;

	/* ---- Layout ---- */
	--radius-xs: 6px;
	--radius-sm: 10px;
	--radius-md: 14px;
	--radius-lg: 20px;
	--radius-xl: 28px;

	--font-main: 'Atkinson Hyperlegible', 'Inter', -apple-system,
		BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial,
		system-ui, sans-serif;
	--font-display: var(--font-main);

	--transition-fast: 120ms cubic-bezier(0.4, 0, 0.2, 1);
	--transition-normal: 200ms cubic-bezier(0.4, 0, 0.2, 1);
	--transition-bounce: 0.42s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Explicit light theme rule, kept for backwards compatibility with markup
   that hard-codes data-theme='light'. Values mirror :root. */
[data-theme='light'] {
	color-scheme: light;
}

@supports (height: 100dvh) {
	:root { --viewport-height: 100dvh; }
}

/* ---- Dark theme — opt-in via toggle ---- */
[data-theme='dark'] {
	color-scheme: dark;
	--bg: #000000;
	--bg-elevated: #0a0a0a;
	--bg-muted: #141414;
	--bg-contrast: #1c1c1c;
	--bg-overlay: rgba(0, 0, 0, 0.72);

	--text: #f4f4f5;
	--text-muted: #a1a1aa;
	--text-dim: #71717a;

	--border: rgba(255, 255, 255, 0.07);
	--border-strong: rgba(255, 255, 255, 0.16);
	--border-focus: rgba(196, 181, 253, 0.55);

	--shadow: 0 1px 0 rgba(255, 255, 255, 0.04), 0 8px 24px rgba(0, 0, 0, 0.4);
	--shadow-hover: 0 1px 0 rgba(255, 255, 255, 0.08), 0 18px 48px rgba(0, 0, 0, 0.55);

	--accent: #c4b5fd;
	--accent-strong: #a78bfa;
	--accent-deep: #7c3aed;
	--accent-soft: rgba(196, 181, 253, 0.12);
	--accent-glow: rgba(167, 139, 250, 0.28);
	--text-on-accent: #0a0a0a;

	--success: #4ade80;
	--error: #fb7185;
	--warning: #fbbf24;
}

/* ---- Pink theme — soft rose, dark berry text ---- */
[data-theme='pink'] {
	color-scheme: light;
	--bg: #fff1f5;
	--bg-elevated: #ffffff;
	--bg-muted: #fce7f3;
	--bg-contrast: #fbcfe8;
	--bg-overlay: rgba(131, 24, 67, 0.45);

	--text: #500724;
	--text-muted: #9d174d;
	--text-dim: #be185d;

	--border: rgba(190, 24, 93, 0.16);
	--border-strong: rgba(190, 24, 93, 0.35);
	--border-focus: rgba(236, 72, 153, 0.55);

	--shadow: 0 1px 0 rgba(236, 72, 153, 0.06), 0 8px 22px rgba(236, 72, 153, 0.12);
	--shadow-hover: 0 1px 0 rgba(236, 72, 153, 0.10), 0 18px 40px rgba(236, 72, 153, 0.22);

	--accent: #ec4899;
	--accent-strong: #db2777;
	--accent-deep: #be185d;
	--accent-soft: rgba(236, 72, 153, 0.14);
	--accent-glow: rgba(236, 72, 153, 0.30);
	--text-on-accent: #ffffff;

	--success: #15803d;
	--error: #b91c1c;
	--warning: #b45309;
}

/* ============================================================
   Resets & document-level setup
   ============================================================ */

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

html {
	-webkit-text-size-adjust: 100%;
	text-size-adjust: 100%;
	scroll-behavior: smooth;
	background: var(--bg);
	/* Never allow horizontal scroll on the document — any element wider
	   than the viewport gets clipped rather than triggering page-level
	   horizontal scroll on phones (which is what iOS Safari was doing
	   on each "Weiter" click). */
	overflow-x: hidden;
	max-width: 100vw;
}

body {
	overflow-x: clip;
	max-width: 100vw;
}

@media (prefers-reduced-motion: reduce) {
	html { scroll-behavior: auto; }
}

body {
	margin: 0;
	min-height: var(--viewport-height);
	font-family: var(--font-main);
	font-size: 15px;
	font-weight: 400;
	line-height: 1.55;
	letter-spacing: -0.005em;
	color: var(--text);
	background: var(--bg);
	background-image:
		radial-gradient(700px 500px at 100% 10%, var(--accent-glow), transparent 75%);
	/* background-attachment: fixed; — removed: caused repaint artefacts on
	   mobile WebKit (random "black flash" on tap during scroll). */
	padding-bottom: var(--safe-area-bottom);
	padding-left: var(--safe-area-left);
	padding-right: var(--safe-area-right);
	-webkit-tap-highlight-color: transparent;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	overscroll-behavior-y: contain;
	min-height: 100vh;
	min-height: var(--viewport-height);
}

/* body background-image already uses var(--accent-glow) which adapts to
   whichever theme is active — no per-theme override needed anymore. */

/* ---- Typography ---- */
h1, h2, h3, h4, h5, h6 {
	font-family: var(--font-display);
	font-weight: 700;
	letter-spacing: -0.025em;
	line-height: 1.15;
	margin: 0;
	color: var(--text);
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.4rem); }
h4 { font-size: 1.05rem; }

p { margin: 0; }
strong, b { font-weight: 700; }

/* ---- Eyebrows & Section-Headings ----
   Hier zentral definiert (vorher dupliziert in style.css und home.css
   mit unterschiedlichen Werten — hat dazu geführt, dass z. B.
   "TRANSPARENZ" auf der Homepage (lädt home.css) anders aussah als
   im Impressum (lädt nur style.css). Beide Seiten laden base.css —
   eine einzige Quelle der Wahrheit. */
.eyebrow {
	margin: 0;
	text-transform: uppercase;
	letter-spacing: 0.2em;
	font-size: 0.78rem;
	font-weight: 600;
	color: var(--text-muted);
	line-height: 1.3;
}

.section-heading {
	display: flex;
	justify-content: space-between;
	align-items: flex-end;
	margin-bottom: 1.1rem;
	gap: 1rem;
}

.section-heading > div {
	display: flex;
	flex-direction: column;
	gap: 0.25rem;
}

.section-heading h3 {
	margin: 0;
	font-size: 1.25rem;
	font-weight: 700;
	letter-spacing: -0.015em;
}

@media (max-width: 480px) {
	.eyebrow {
		font-size: 0.66rem;
		letter-spacing: 0.16em;
	}
	.section-heading {
		flex-direction: column;
		align-items: flex-start;
		gap: 0.5rem;
	}
}

a {
	color: var(--accent);
	text-decoration: none;
	text-decoration-thickness: 1px;
	text-underline-offset: 3px;
	transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

a:hover,
a:focus-visible {
	color: var(--accent-strong);
	text-decoration: underline;
	text-decoration-color: var(--accent-strong);
}

/* ---- Form controls ---- */
input,
textarea,
select,
button {
	font-family: inherit;
	font-size: max(16px, 0.95rem);
	color: inherit;
	letter-spacing: inherit;
}

input,
textarea,
select {
	width: 100%;
	background: var(--bg-muted);
	color: var(--text);
	border: 1px solid var(--border);
	border-radius: var(--radius-sm);
	padding: 0.7rem 0.85rem;
	transition: border-color var(--transition-fast), background var(--transition-fast),
		box-shadow var(--transition-fast);
}

input::placeholder,
textarea::placeholder {
	color: var(--text-dim);
	opacity: 1;
}

input:hover,
textarea:hover,
select:hover {
	border-color: var(--border-strong);
}

input:focus,
textarea:focus,
select:focus {
	outline: none;
	border-color: var(--accent);
	box-shadow: 0 0 0 3px var(--accent-soft);
	background: var(--bg-contrast);
}

input:focus-visible,
textarea:focus-visible,
select:focus-visible,
button:focus-visible,
a:focus-visible {
	outline: 2px solid var(--border-focus);
	outline-offset: 2px;
}

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

/* Mobile touch targets — WCAG 2.5.5 */
@media (pointer: coarse) {
	button,
	.btn,
	a.btn,
	[role="button"],
	input[type="button"],
	input[type="submit"],
	input[type="reset"],
	.survey-link-btn {
		min-height: var(--touch-target-min);
		min-width: var(--touch-target-min);
	}
	input[type="checkbox"],
	input[type="radio"] {
		min-width: 1.45rem;
		min-height: 1.45rem;
	}
	a { padding-block: 0.15rem; }
}

@media (hover: none) {
	.survey-card:hover,
	.theme-toggle:hover,
	.icon-button:hover,
	.btn:hover {
		box-shadow: var(--shadow);
		background: var(--bg-muted);
		border-color: var(--border);
	}
}

/* ============================================================
   Shared components — buttons, icon buttons, theme toggle
   ============================================================ */

.btn,
.login_btn,
button.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 0.5rem;
	border: 1px solid var(--border);
	border-radius: var(--radius-sm);
	padding: 0.65rem 1.15rem;
	font-weight: 500;
	font-size: 0.9rem;
	letter-spacing: 0.01em;
	background: var(--bg-muted);
	color: var(--text);
	cursor: pointer;
	box-shadow: var(--shadow);
	transition: background var(--transition-fast),
		border-color var(--transition-fast),
		filter var(--transition-fast),
		color var(--transition-fast);
}

/* #19: kein Größerwerden / Lift mehr beim Hovern.
   Nur ein dezenter Helligkeits- + Background-Wechsel. */
.btn:hover,
button.btn:hover,
.login_btn:hover {
	border-color: var(--border-strong);
	background: var(--bg-contrast);
}

.btn:active,
button.btn:active,
.login_btn:active {
	filter: brightness(0.96);
}

.btn-primary,
button.btn-primary,
.login_btn.btn-primary {
	background: var(--bg-muted);
	color: var(--text);
	border-color: var(--border);
	box-shadow: var(--shadow);
}

[data-theme='light'] .btn-primary,
[data-theme='light'] button.btn-primary,
[data-theme='light'] .login_btn.btn-primary,
[data-theme='pink'] .btn-primary,
[data-theme='pink'] button.btn-primary,
[data-theme='pink'] .login_btn.btn-primary {
	color: var(--text) !important;
}

.btn-primary:hover,
.login_btn.btn-primary:hover {
	box-shadow: 0 1px 0 rgba(255, 255, 255, 0.18) inset,
		0 16px 40px var(--accent-glow);
	filter: brightness(1.05);
}

.btn-secondary {
	background: transparent;
	border-color: var(--border-strong);
}

.btn-secondary:hover {
	background: var(--bg-muted);
}

.btn-warning {
	background: var(--bg-muted);
	border-color: var(--border-strong);
}

.btn-ghost {
	background: transparent;
	border-color: transparent;
	box-shadow: none;
}

.btn-ghost:hover {
	background: var(--bg-muted);
	border-color: var(--border);
	box-shadow: var(--shadow);
}

.btn[disabled],
button[disabled] {
	opacity: 0.5;
	cursor: not-allowed;
	transform: none !important;
	filter: grayscale(0.4);
}

/* ---- Icon button + theme toggle ---- */
.icon-button {
	display: flex;
	align-items: center;
	justify-content: center;
	width: 2.5rem;
	height: 2.5rem;
	padding: 0;
	line-height: 0;
	border-radius: 999px;
	border: 1px solid var(--border);
	background: var(--bg-muted);
	cursor: pointer;
	transition:
		background var(--transition-fast),
		transform var(--transition-fast),
		border-color var(--transition-fast),
		box-shadow var(--transition-normal);
}

/* #19: icon button hover — kein Lift mehr, nur dezenter bg/border-wechsel. */
.icon-button:hover {
	background: var(--bg-contrast);
	border-color: var(--border-strong);
}

.theme-toggle .theme-icon {
	display: block;
	width: 1.25rem;
	height: 1.25rem;
	background-image: var(--theme-toggle-icon);
	background-repeat: no-repeat;
	background-position: center;
	background-size: contain;
	transition: transform var(--transition-bounce);
}

/* #19: theme toggle icon — kleinere, ruhigere Rotation, kein Skalieren mehr. */
.theme-toggle:hover .theme-icon { transform: rotate(8deg); }
.theme-toggle:active .theme-icon { transform: rotate(-4deg); }

/* Unbordered back link: chevron icon only, inherits theme text color.
   Replaces big "Zurück zum Hauptmenü" buttons on every subpage. */
.back-link {
	display: inline-grid;
	place-items: center;
	width: 2.5rem;
	height: 2.5rem;
	padding: 0;
	border: none;
	background: transparent;
	color: var(--text);
	cursor: pointer;
	border-radius: 999px;
	transition: background var(--transition-fast), color var(--transition-fast),
		transform var(--transition-fast);
}

.back-link svg {
	width: 1.4rem;
	height: 1.4rem;
	display: block;
	transition: transform var(--transition-fast);
}

.back-link:hover {
	background: var(--bg-muted);
	color: var(--accent);
}

.back-link:hover svg { transform: translateX(-2px); }

.back-link:active svg { transform: translateX(-4px) scale(0.95); }

.back-link:focus-visible {
	outline: 2px solid var(--border-focus);
	outline-offset: 2px;
}

.theme-toggle { --theme-toggle-icon: url('dunkel.svg?v=5'); }
.theme-toggle[data-theme-current='dark']  { --theme-toggle-icon: url('dunkel.svg?v=5'); }
.theme-toggle[data-theme-current='light'] { --theme-toggle-icon: url('hell.svg?v=5'); }
.theme-toggle[data-theme-current='pink']  { --theme-toggle-icon: url('pink.svg?v=5'); }

html[data-theme='dark']  .theme-toggle:not([data-theme-current]) { --theme-toggle-icon: url('dunkel.svg?v=5'); }
html[data-theme='light'] .theme-toggle:not([data-theme-current]) { --theme-toggle-icon: url('hell.svg?v=5'); }
html[data-theme='pink']  .theme-toggle:not([data-theme-current]) { --theme-toggle-icon: url('pink.svg?v=5'); }

/* ============================================================
   Cards
   ============================================================ */

.survey-card {
	position: relative;
	background: var(--bg-elevated);
	border: 1px solid var(--border);
	border-radius: var(--radius-lg);
	padding: 1.4rem;
	box-shadow: var(--shadow);
	transition: transform var(--transition-normal),
		border-color var(--transition-fast),
		box-shadow var(--transition-normal);
	overflow: hidden;
}

.survey-card::before {
	content: '';
	position: absolute;
	inset: 0;
	border-radius: inherit;
	padding: 1px;
	background: linear-gradient(135deg, var(--accent-glow), transparent 60%);
	-webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
	mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
	-webkit-mask-composite: xor;
	mask-composite: exclude;
	opacity: 0;
	transition: opacity var(--transition-normal);
	pointer-events: none;
}

/* #19: cards — kein Lift mehr, nur ein dezenter Border-/Shadow-Wechsel. */
.survey-card:hover {
	border-color: var(--border-strong);
	box-shadow: var(--shadow-hover);
}

.survey-card:hover::before {
	opacity: 1;
}

/* ============================================================
   Counter roll animation
   ============================================================ */

.is-counter-rolling {
	display: grid !important;
	overflow: hidden !important;
	align-items: start !important;
}

.completions-count.is-counter-rolling {
	display: inline-grid !important;
	vertical-align: bottom;
}

.counter-roll-layer {
	grid-area: 1 / 1;
	line-height: inherit;
	will-change: transform, opacity;
	animation-duration: 420ms;
	animation-fill-mode: forwards;
	animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
}

.counter-roll-layer.is-outgoing { animation-name: counter-roll-out; }
.counter-roll-layer.is-incoming { animation-name: counter-roll-in; }

@keyframes counter-roll-out {
	from { transform: translateY(0); opacity: 1; }
	to   { transform: translateY(100%); opacity: 0; }
}

@keyframes counter-roll-in {
	from { transform: translateY(-100%); opacity: 0; }
	to   { transform: translateY(0); opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
	.counter-roll-layer { animation-duration: 1ms; }
}

/* ============================================================
   Progress bar
   ============================================================ */

.progress-container {
	width: 100%;
	height: 0.55rem;
	background: var(--bg-muted);
	border-radius: 999px;
	overflow: hidden;
	border: 1px solid var(--border);
	margin: 0.5rem 0 1rem;
}

.progress-bar {
	height: 100%;
	width: 0;
	border-radius: 999px;
	background: linear-gradient(90deg, var(--accent-strong), var(--accent));
	box-shadow: 0 0 14px var(--accent-glow);
	transition: width var(--transition-normal);
}

/* ============================================================
   Utility
   ============================================================ */

.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;
}

.hidden { display: none !important; }