/* ==========================================================================
   HTML und CSS -- Webversion des Kapitels
   ========================================================================== */

/* Das dunkle Schema ist der Standard; hell nur auf Wunsch
   ([data-theme="light"], gesetzt vom Umschalter in der Kopfleiste). */
:root {
	--ink: #e4eaef;
	--ink-soft: #aab8c4;
	--ink-faint: #7e8d9a;
	--paper: #161c22;
	--paper-soft: #1d242b;
	--paper-sunk: #252d35;
	--line: #35404a;
	--line-soft: #2a333c;

	--accent: #5fc9ae;
	--accent-soft: #17302a;
	--accent-line: #2f5f53;

	--flag: #e88b90;
	--flag-soft: #2e1c1e;

	--code-bg: #1a2128;
	--code-tag: #5fc9ae;
	--code-attr: #d9a94a;
	--code-string: #e88b90;
	--code-comment: #7e8d9a;
	--code-prop: #82b6e0;
	--code-punct: #7e8d9a;

	color-scheme: dark;

	--radius: 6px;
	--measure: 46rem;
	--mono: "SFMono-Regular", "JetBrains Mono", "Fira Mono", Menlo, Consolas,
		monospace;
	--sans: "Fira Sans", -apple-system, "Segoe UI", Roboto, Helvetica, Arial,
		sans-serif;
}

:root[data-theme="light"] {
	--ink: #1b2733;
	--ink-soft: #4a5a6a;
	--ink-faint: #7b8a99;
	--paper: #ffffff;
	--paper-soft: #f5f7f9;
	--paper-sunk: #eaeef2;
	--line: #d7dee5;
	--line-soft: #e6ebf0;

	--accent: #0b6b58;
	--accent-soft: #e3f1ed;
	--accent-line: #9dcabe;

	--flag: #a4343a;
	--flag-soft: #fbeced;

	--code-bg: #f7f9fa;
	--code-tag: #0b6b58;
	--code-attr: #8a5a00;
	--code-string: #a4343a;
	--code-comment: #7b8a99;
	--code-prop: #1f4e79;
	--code-punct: #7b8a99;

	color-scheme: light;
}

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

html {
	scroll-behavior: smooth;
	scroll-padding-top: 5rem;
	/* Saemtliche Groessen der Seite sind in rem angegeben und haengen damit an
	   dieser einen Zahl: 110% der ueblichen 16px ergeben 17.6px. Wer die Schrift
	   im ganzen Skript groesser oder kleiner haben will, dreht nur hier. */
	font-size: 110%;
}

body {
	margin: 0;
	background: var(--paper);
	color: var(--ink);
	font-family: var(--sans);
	font-size: 1.0625rem;
	line-height: 1.62;
	-webkit-text-size-adjust: 100%;
	/* Sanftes Ueberblenden beim Umschalten des Farbschemas statt eines
	   harten Schnitts. */
	transition: background-color 0.25s ease, color 0.25s ease;
}

/* Dezentes Eintreten beim Laden der Seite: die Hauptbloecke (".content" +
   ".minitoc", oder ".hero" + ".cards" auf den Uebersichtsseiten) blenden
   einmalig sanft ein, statt abrupt zu erscheinen. */
@keyframes fade-rise {
	from {
		opacity: 0;
		transform: translateY(6px);
	}
	to {
		opacity: 1;
		transform: translateY(0);
	}
}

main > * {
	/* Kein fill-mode "both": der waere nach Ablauf weiterhin "aktiv" und
	   liesse transform: translateY(0) auf .content stehen -- das erzeugt
	   einen neuen Containing Block fuer position:fixed-Nachfahren und
	   bricht damit das Vollbild der Werkbank (.workbench.is-full). */
	animation: fade-rise 0.4s ease-out;
}

/* --- Kopfleiste ---------------------------------------------------------- */

.topbar {
	position: sticky;
	top: 0;
	z-index: 40;
	display: flex;
	align-items: center;
	gap: 1rem;
	padding: 0.55rem 1.25rem;
	background: var(--paper);
	background: color-mix(in srgb, var(--paper) 88%, transparent);
	backdrop-filter: blur(10px);
	border-bottom: 1px solid var(--line-soft);
	transition: background-color 0.25s ease, border-color 0.25s ease;
}

.topbar__home {
	font-weight: 600;
	font-size: 0.9rem;
	text-decoration: none;
	color: var(--ink);
	white-space: nowrap;
}

.topbar__home span {
	color: var(--accent);
}

.topbar nav {
	display: flex;
	gap: 0.15rem;
	margin-left: auto;
	flex-wrap: wrap;
}

.topbar nav a {
	padding: 0.3rem 0.7rem;
	border-radius: var(--radius);
	font-size: 0.85rem;
	text-decoration: none;
	color: var(--ink-soft);
	transition: background 0.15s, color 0.15s;
}

.topbar nav a:hover,
.topbar nav a:focus-visible {
	background: var(--paper-sunk);
	color: var(--ink);
}

.topbar nav a[aria-current="page"] {
	background: var(--accent-soft);
	color: var(--accent);
	font-weight: 600;
}

.themetoggle {
	border: 1px solid var(--line);
	background: var(--paper);
	color: var(--ink-soft);
	border-radius: var(--radius);
	width: 2rem;
	height: 2rem;
	font-size: 0.95rem;
	cursor: pointer;
	line-height: 1;
	transition: color 0.15s ease, border-color 0.15s ease, transform 0.2s ease;
}

.themetoggle:hover {
	color: var(--ink);
	border-color: var(--ink-faint);
}

.themetoggle:active {
	transform: scale(0.88) rotate(-12deg);
}

/* --- Grundraster --------------------------------------------------------- */

.layout {
	display: grid;
	grid-template-columns: minmax(0, 1fr) 15rem;
	gap: 3rem;
	max-width: 74rem;
	margin: 0 auto;
	padding: 2.5rem 1.5rem 6rem;
	align-items: start;
}

.content {
	min-width: 0;
	max-width: var(--measure);
}

.content > * {
	max-width: var(--measure);
}

/* Editoren und Listings duerfen breiter sein als der Lesetext. */
.content > .workbench,
.content > figure.listing,
.content > .split,
.content .exercise {
	max-width: none;
}

/* --- Seitliches Inhaltsverzeichnis (minitoc) ---------------------------- */

.minitoc {
	position: sticky;
	top: 4.5rem;
	font-size: 0.85rem;
	border-left: 2px solid var(--line-soft);
	padding-left: 1rem;
	max-height: calc(100vh - 7rem);
	overflow-y: auto;
}

.minitoc h2 {
	font-size: 0.72rem;
	letter-spacing: 0.09em;
	text-transform: uppercase;
	color: var(--ink-faint);
	margin: 0 0 0.6rem;
	font-weight: 600;
}

.minitoc ol {
	list-style: none;
	margin: 0;
	padding: 0;
}

.minitoc li {
	margin: 0.1rem 0;
}

.minitoc li.sub {
	padding-left: 0.9rem;
	font-size: 0.8rem;
}

.minitoc a {
	color: var(--ink-soft);
	text-decoration: none;
	display: block;
	padding: 0.12rem 0;
	border-radius: 3px;
	transition: color 0.15s ease;
}

.minitoc a:hover {
	color: var(--accent);
}

.minitoc a.active {
	color: var(--accent);
	font-weight: 600;
}

@media (max-width: 62rem) {
	.layout {
		grid-template-columns: minmax(0, 1fr);
		gap: 0;
	}

	.minitoc {
		display: none;
	}
}

/* --- Typografie ---------------------------------------------------------- */

h1,
h2,
h3,
h4 {
	line-height: 1.22;
	color: var(--ink);
	font-weight: 650;
	margin: 0 0 0.6rem;
	text-wrap: balance;
}

h1 {
	font-size: clamp(1.9rem, 4.5vw, 2.5rem);
	letter-spacing: -0.02em;
}

h2 {
	font-size: 1.5rem;
	margin-top: 3.2rem;
	padding-top: 1.2rem;
	border-top: 1px solid var(--line-soft);
}

h3 {
	font-size: 1.16rem;
	margin-top: 2.4rem;
}

h4 {
	font-size: 1rem;
	margin-top: 1.8rem;
	color: var(--ink-soft);
}

.eyebrow {
	font-size: 0.76rem;
	letter-spacing: 0.1em;
	text-transform: uppercase;
	color: var(--accent);
	font-weight: 650;
	margin: 0 0 0.35rem;
}

p {
	margin: 0 0 1.05rem;
}

a {
	color: var(--accent);
	text-decoration-thickness: 1px;
	text-underline-offset: 2px;
}

em {
	font-style: italic;
}

strong {
	font-weight: 650;
}

ul,
ol {
	margin: 0 0 1.05rem;
	padding-left: 1.4rem;
}

li {
	margin: 0.2rem 0;
}

blockquote {
	margin: 1.4rem 0;
	padding: 0.1rem 0 0.1rem 1.2rem;
	border-left: 3px solid var(--accent-line);
	color: var(--ink-soft);
	font-style: italic;
}

blockquote footer {
	font-style: normal;
	font-size: 0.85rem;
	color: var(--ink-faint);
	margin-top: 0.4rem;
}

hr {
	border: 0;
	border-top: 1px solid var(--line-soft);
	margin: 2.5rem 0;
}

/* Definitionslisten (LaTeX description) */
.deflist {
	margin: 0 0 1.2rem;
}

.deflist > div {
	padding: 0.7rem 0;
	border-bottom: 1px solid var(--line-soft);
}

.deflist > div:first-child {
	border-top: 1px solid var(--line-soft);
}

.deflist dt {
	font-weight: 650;
	margin-bottom: 0.2rem;
}

.deflist dd {
	margin: 0;
	color: var(--ink-soft);
}

.deflist dd > p:last-child {
	margin-bottom: 0;
}

/* --- Inline-Code --------------------------------------------------------- */

code {
	font-family: var(--mono);
	font-size: 0.875em;
	background: var(--paper-sunk);
	padding: 0.1em 0.35em;
	border-radius: 3px;
	white-space: nowrap;
}

/* --- Listings ------------------------------------------------------------ */

figure.listing {
	margin: 1.5rem 0;
}

figure.listing pre {
	margin: 0;
	overflow-x: auto;
	background: var(--code-bg);
	border: 1px solid var(--line-soft);
	border-radius: var(--radius);
	padding: 0.9rem 1rem;
	font-family: var(--mono);
	font-size: 0.82rem;
	line-height: 1.6;
	tab-size: 2;
}

figure.listing pre code {
	background: none;
	padding: 0;
	font-size: inherit;
	white-space: pre;
	border-radius: 0;
}

figure.listing figcaption {
	font-size: 0.82rem;
	color: var(--ink-faint);
	margin-top: 0.5rem;
	padding-left: 0.1rem;
}

figure.listing figcaption b {
	color: var(--ink-soft);
	font-weight: 600;
}

/* Zeilennummern. Der Zaehler steht auf dem <pre>, damit ein Ausschnitt per
   Inline-Style bei der echten Zeilennummer der Datei beginnen kann. */
pre.linenos {
	counter-reset: ln;
}

pre.linenos code {
	display: block;
}

pre.linenos .ln {
	counter-increment: ln;
	display: block;
}

pre.linenos .ln::before {
	content: counter(ln);
	display: inline-block;
	width: 2.2em;
	margin-right: 1em;
	text-align: right;
	color: var(--ink-faint);
	user-select: none;
	opacity: 0.7;
}

pre .hl {
	background: var(--accent-soft);
	display: block;
	margin: 0 -1rem;
	padding: 0 1rem;
}

/* Syntax-Farben */
.t-tag {
	color: var(--code-tag);
}
.t-attr {
	color: var(--code-attr);
}
.t-str {
	color: var(--code-string);
}
.t-com {
	color: var(--code-comment);
	font-style: italic;
}
.t-prop {
	color: var(--code-prop);
}
.t-sel {
	color: var(--code-tag);
	font-weight: 600;
}
.t-punct {
	color: var(--code-punct);
}
.t-num {
	color: var(--code-string);
}
.t-kw {
	color: var(--code-tag);
	font-weight: 600;
}
.t-fn {
	color: var(--code-prop);
}

/* --- Zwei Spalten (Code + Bild / HTML + CSS) ---------------------------- */

.split {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(min(100%, 19rem), 1fr));
	gap: 1.2rem;
	align-items: start;
	margin: 1.5rem 0;
}

.split > figure {
	margin: 0;
	min-width: 0;
}

figure.shot {
	margin: 1.5rem 0;
}

figure.shot img {
	display: block;
	max-width: 100%;
	height: auto;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: #fff;
}

figure.shot.plain img {
	border: 0;
	background: none;
}

figure.shot figcaption {
	font-size: 0.82rem;
	color: var(--ink-faint);
	margin-top: 0.5rem;
}

/* Bildnachweis -- Urheber, Quelle und Lizenz direkt an der Abbildung. Bei den
   CC-BY-SA-Bildern ist das keine Hoeflichkeit, sondern Bedingung der Lizenz:
   sie verlangt Namensnennung und einen Link auf den Lizenztext. */
.credit {
	display: block;
	margin-top: 0.25rem;
	font-size: 0.72rem;
	color: var(--ink-faint);
	line-height: 1.4;
}

/* Erklaerende Figuren, direkt als Inline-SVG in der Seite (Koordinatensystem,
   Kontrollpunkte einer Bezierkurve). Sie zeichnen mit currentColor und gehen
   darum beim Wechsel des Farbschemas mit. */
figure.diagram {
	margin: 1.5rem 0;
	text-align: center;
	color: var(--ink);
}

figure.diagram svg {
	max-width: 100%;
	height: auto;
}

figure.diagram figcaption {
	font-size: 0.82rem;
	color: var(--ink-faint);
	margin-top: 0.5rem;
	text-align: left;
}

/* Live-Vorschau eines Beispiels */
.demo {
	margin: 1.5rem 0;
}

.demo iframe {
	display: block;
	width: 100%;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: #fff;
}

.demo figcaption {
	font-size: 0.82rem;
	color: var(--ink-faint);
	margin-top: 0.5rem;
}

/* --- Auszeichnungsboxen (eg, rem, def) ---------------------------------- */

.box {
	margin: 1.6rem 0;
	padding: 1.1rem 1.25rem;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: var(--paper-soft);
}

.box > :last-child {
	margin-bottom: 0;
}

.box__label {
	font-size: 0.72rem;
	letter-spacing: 0.09em;
	text-transform: uppercase;
	font-weight: 650;
	color: var(--accent);
	margin: 0 0 0.55rem;
}

.box--note {
	background: var(--accent-soft);
	border-color: var(--accent-line);
}

.box--warn {
	background: var(--flag-soft);
	border-color: var(--flag);
}

.box--warn .box__label {
	color: var(--flag);
}

/* Hinweis in einer Uebung */
.hint {
	font-size: 0.9rem;
	color: var(--ink-soft);
	border-left: 3px solid var(--line);
	padding-left: 0.9rem;
	margin: 0.9rem 0;
}

.hint > :last-child {
	margin-bottom: 0;
}

/* --- Uebungen ------------------------------------------------------------ */

.exercise {
	margin: 2.2rem 0;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: var(--paper);
	overflow: hidden;
}

.exercise__head {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	padding: 0.7rem 1.1rem;
	background: var(--paper-soft);
	border-bottom: 1px solid var(--line-soft);
	transition: background-color 0.25s ease;
}

.exercise__no {
	font-size: 0.78rem;
	font-weight: 650;
	letter-spacing: 0.06em;
	text-transform: uppercase;
	color: var(--accent);
}

.exercise__tag {
	font-size: 0.7rem;
	padding: 0.1rem 0.45rem;
	border-radius: 999px;
	border: 1px solid var(--line);
	color: var(--ink-faint);
	text-transform: uppercase;
	letter-spacing: 0.05em;
}

.exercise__done {
	margin-left: auto;
	display: flex;
	align-items: center;
	gap: 0.4rem;
	font-size: 0.8rem;
	color: var(--ink-faint);
	cursor: pointer;
	user-select: none;
	white-space: nowrap;
	transition: color 0.2s ease;
}

.exercise__done input {
	accent-color: var(--accent);
	width: 1rem;
	height: 1rem;
	cursor: pointer;
	transition: transform 0.15s ease;
}

/* Kleiner "Pop" beim Abhaken, statt dass das Haekchen kommentarlos auftaucht. */
.exercise__done input:checked {
	transform: scale(1.15);
}

.exercise[data-done="1"] .exercise__head {
	background: var(--accent-soft);
}

.exercise[data-done="1"] .exercise__done {
	color: var(--accent);
	font-weight: 600;
}

.exercise__body {
	padding: 1.1rem 1.1rem 1.25rem;
}

.exercise__body > :first-child {
	margin-top: 0;
}

.exercise__body > :last-child {
	margin-bottom: 0;
}

/* Aufgabenliste (tasks) */
.tasks {
	list-style: none;
	counter-reset: task;
	padding: 0;
	margin: 0 0 1.05rem;
}

.tasks > li {
	counter-increment: task;
	position: relative;
	padding-left: 2rem;
	margin: 0.45rem 0;
}

.tasks > li::before {
	content: "(" counter(task, lower-alpha) ")";
	position: absolute;
	left: 0;
	color: var(--ink-faint);
	font-variant-numeric: tabular-nums;
	font-size: 0.9rem;
}

.tasks--cols {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
	gap: 0 1rem;
}

/* --- Loesungen ----------------------------------------------------------- */

details.sol {
	margin: 1.2rem 0 0;
	border: 1px dashed var(--accent-line);
	border-radius: var(--radius);
	background: var(--paper-soft);
}

details.sol > summary {
	cursor: pointer;
	padding: 0.55rem 0.9rem;
	font-size: 0.86rem;
	font-weight: 600;
	color: var(--accent);
	list-style: none;
	display: flex;
	align-items: center;
	gap: 0.5rem;
}

details.sol > summary::-webkit-details-marker {
	display: none;
}

details.sol > summary::before {
	content: "▸";
	font-size: 0.8rem;
	transition: transform 0.15s;
}

details.sol[open] > summary::before {
	transform: rotate(90deg);
}

details.sol > summary:hover {
	text-decoration: underline;
}

.sol__body {
	padding: 0 0.9rem 0.9rem;
	border-top: 1px solid var(--line-soft);
	padding-top: 0.9rem;
}

.sol__body > :first-child {
	margin-top: 0;
}

.sol__body > :last-child {
	margin-bottom: 0;
}

/* --- Werkbank (Editor + Vorschau) --------------------------------------- */

.workbench {
	margin: 1.4rem 0;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: var(--paper-soft);
	overflow: hidden;
}

.wb__bar {
	display: flex;
	align-items: center;
	gap: 0.3rem;
	padding: 0.4rem 0.55rem;
	background: var(--paper-sunk);
	border-bottom: 1px solid var(--line);
	flex-wrap: wrap;
}

.wb__tabs {
	display: flex;
	gap: 0.2rem;
}

.wb__tab {
	font-family: var(--mono);
	font-size: 0.76rem;
	padding: 0.3rem 0.65rem;
	border: 1px solid transparent;
	border-radius: 4px;
	background: none;
	color: var(--ink-soft);
	cursor: pointer;
	transition: background-color 0.15s ease, color 0.15s ease,
		border-color 0.15s ease;
}

.wb__tab:hover {
	color: var(--ink);
}

.wb__tab[aria-selected="true"] {
	background: var(--paper);
	border-color: var(--line);
	color: var(--ink);
	font-weight: 600;
}

.wb__actions {
	margin-left: auto;
	display: flex;
	gap: 0.25rem;
	flex-wrap: wrap;
}

.wb__btn {
	font-size: 0.76rem;
	font-family: var(--sans);
	padding: 0.3rem 0.6rem;
	border: 1px solid var(--line);
	border-radius: 4px;
	background: var(--paper);
	color: var(--ink-soft);
	cursor: pointer;
	white-space: nowrap;
	transition: background-color 0.15s ease, color 0.15s ease,
		border-color 0.15s ease, opacity 0.15s ease;
}

.wb__btn:disabled {
	opacity: 0.6;
	cursor: default;
}

.wb__btn:hover {
	color: var(--ink);
	border-color: var(--ink-faint);
}

.wb__btn--primary {
	background: var(--accent);
	border-color: var(--accent);
	color: #fff;
	font-weight: 600;
	transition: filter 0.15s ease, opacity 0.15s ease;
}

.wb__btn--primary:hover {
	color: #fff;
	filter: brightness(1.08);
}

.wb__panes {
	display: grid;
	grid-template-columns: 1fr 1fr;
	min-height: 17rem;
}

.wb__editor {
	position: relative;
	display: flex;
	background: var(--code-bg);
	border-right: 1px solid var(--line);
	min-width: 0;
}

.wb__gutter {
	flex: 0 0 auto;
	padding: 0.75rem 0.4rem 0.75rem 0.7rem;
	font-family: var(--mono);
	font-size: 0.8rem;
	line-height: 1.55;
	color: var(--ink-faint);
	text-align: right;
	user-select: none;
	opacity: 0.6;
	white-space: pre;
	overflow: hidden;
}

/* Der Editor besteht aus zwei genau uebereinanderliegenden Ebenen: unten der
   eingefaerbte Code (.wb__hl), darueber das Textfeld mit durchsichtiger
   Schrift. Beide brauchen dieselben Schriftmasse, sonst laufen sie auseinander. */
.wb__stack {
	position: relative;
	flex: 1 1 auto;
	min-width: 0;
}

.wb__hl,
.wb__code {
	position: absolute;
	inset: 0;
	margin: 0;
	border: 0;
	padding: 0.75rem 0.75rem 0.75rem 0.3rem;
	font-family: var(--mono);
	font-size: 0.8rem;
	line-height: 1.55;
	tab-size: 2;
	background: none;
	white-space: pre;
	overflow-wrap: normal;
}

.wb__hl {
	overflow: hidden;
	pointer-events: none;
	color: var(--ink);
}

/* Die globale Regel fuer <code> (Hintergrund, kleinere Schrift) wuerde die
   Ebenen gegeneinander verschieben. */
.wb__hl code {
	font: inherit;
	background: none;
	padding: 0;
	border-radius: 0;
	white-space: pre;
}

.wb__code {
	width: 100%;
	height: 100%;
	outline: none;
	resize: none;
	overflow: auto;
	color: transparent;
	caret-color: var(--ink);
}

/* Halbdurchsichtig, damit der eingefaerbte Code darunter sichtbar bleibt. */
.wb__code::selection {
	background: color-mix(in srgb, var(--accent) 32%, transparent);
}

.wb__code:focus-visible {
	outline: 2px solid var(--accent);
	outline-offset: -2px;
}

.wb__preview {
	display: flex;
	flex-direction: column;
	background: #fff;
	min-width: 0;
}

.wb__preview iframe {
	flex: 1 1 auto;
	width: 100%;
	border: 0;
	min-height: 17rem;
	background: #fff;
}

/* Ausgabe-Konsole der Python-Werkbank: dunkel wie der Editor, kein weisses
   Vorschau-"Papier" -- hier steht kein Dokument, sondern stdout/stderr. */
.wb__preview--console {
	background: var(--code-bg);
}

.wb__console {
	flex: 1 1 auto;
	margin: 0;
	padding: 0.75rem;
	min-height: 17rem;
	overflow: auto;
	font-family: var(--mono);
	font-size: 0.8rem;
	line-height: 1.55;
	white-space: pre-wrap;
	word-break: break-word;
	color: var(--ink-soft);
	transition: color 0.2s ease;
}

.wb__console--error {
	color: var(--flag);
}

.wb__images {
	display: flex;
	flex-direction: column;
	gap: 0.6rem;
	padding: 0 0.75rem 0.75rem;
}

.wb__images:empty {
	padding: 0;
}

.wb__images img {
	display: block;
	max-width: 100%;
	background: #fff;
	border-radius: 4px;
	animation: fade-rise 0.3s ease-out both;
	cursor: zoom-in;
}

/* Tab-Vervollstaendigung im Python-Reiter: kleine Liste, die ueber dem Code
   an der Cursorposition erscheint (siehe acShow in editor.js). Liegt in
   derselben .wb__stack wie .wb__hl/.wb__code, darum absolut positioniert. */
.wb__ac {
	position: absolute;
	z-index: 5;
	margin: 0;
	padding: 0.25rem;
	list-style: none;
	min-width: 9rem;
	max-height: 11rem;
	overflow-y: auto;
	background: var(--paper-soft);
	border: 1px solid var(--line);
	border-radius: var(--radius);
	box-shadow: 0 6px 16px rgba(0, 0, 0, 0.25);
	font-family: var(--mono);
	font-size: 0.78rem;
}

.wb__ac__item {
	display: flex;
	align-items: baseline;
	justify-content: space-between;
	gap: 0.75rem;
	padding: 0.2rem 0.45rem;
	border-radius: 4px;
	color: var(--ink);
	cursor: pointer;
	white-space: nowrap;
}

.wb__ac__item.is-active {
	background: var(--accent-soft);
	color: var(--accent);
}

.wb__ac__kind {
	font-family: var(--sans);
	font-size: 0.68rem;
	color: var(--ink-faint);
}

.wb__ac__item.is-active .wb__ac__kind {
	color: var(--accent);
	opacity: 0.8;
}

.wb__status {
	font-size: 0.72rem;
	padding: 0.25rem 0.6rem;
	color: var(--ink-faint);
	background: var(--paper-sunk);
	border-top: 1px solid var(--line);
	font-family: var(--mono);
	display: flex;
	justify-content: space-between;
	gap: 0.5rem;
}

.wb__status .saved {
	color: var(--accent);
}

@media (max-width: 46rem) {
	.wb__panes {
		grid-template-columns: 1fr;
	}

	.wb__editor {
		border-right: 0;
		border-bottom: 1px solid var(--line);
	}
}

/* Vollbild */
.workbench.is-full {
	position: fixed;
	inset: 0;
	z-index: 90;
	margin: 0;
	border-radius: 0;
	display: flex;
	flex-direction: column;
}

.workbench.is-full .wb__panes {
	flex: 1 1 auto;
	min-height: 0;
}

.workbench.is-full .wb__editor,
.workbench.is-full .wb__preview {
	min-height: 0;
	overflow: hidden;
}

.workbench.is-full .wb__preview iframe {
	min-height: 0;
}

/* --- Startseite ---------------------------------------------------------- */

.hero {
	max-width: var(--measure);
	margin: 0 auto;
	padding: 4rem 1.5rem 0;
}

.hero p.lead {
	font-size: 1.1rem;
	color: var(--ink-soft);
}

.cards {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr));
	gap: 1rem;
	max-width: 74rem;
	margin: 2.5rem auto 0;
	padding: 0 1.5rem;
	list-style: none;
}

.cards li {
	margin: 0;
}

.card {
	display: flex;
	flex-direction: column;
	height: 100%;
	padding: 1.2rem 1.3rem 1.3rem;
	border: 1px solid var(--line);
	border-radius: var(--radius);
	background: var(--paper-soft);
	text-decoration: none;
	color: var(--ink);
	transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}

.card:hover,
.card:focus-visible {
	border-color: var(--accent);
	transform: translateY(-2px);
	box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
}

.card__no {
	font-size: 0.75rem;
	font-weight: 650;
	letter-spacing: 0.09em;
	text-transform: uppercase;
	color: var(--accent);
	margin-bottom: 0.35rem;
}

.card h2 {
	font-size: 1.16rem;
	margin: 0 0 0.4rem;
	border: 0;
	padding: 0;
}

.card p {
	font-size: 0.9rem;
	color: var(--ink-soft);
	margin: 0 0 1rem;
}

.card__meter {
	margin-top: auto;
	font-size: 0.78rem;
	color: var(--ink-faint);
}

.meter {
	height: 5px;
	border-radius: 99px;
	background: var(--paper-sunk);
	overflow: hidden;
	margin-bottom: 0.35rem;
}

.meter > i {
	display: block;
	height: 100%;
	background: var(--accent);
	border-radius: 99px;
	transition: width 0.3s;
}

.pagefoot {
	max-width: 74rem;
	margin: 0 auto;
	padding: 3rem 1.5rem 5rem;
	font-size: 0.85rem;
	color: var(--ink-faint);
}

.pagefoot a {
	color: var(--ink-soft);
}

/* Blaettern */
.pager {
	display: flex;
	justify-content: space-between;
	gap: 1rem;
	margin-top: 4rem;
	padding-top: 1.5rem;
	border-top: 1px solid var(--line-soft);
	font-size: 0.9rem;
	max-width: var(--measure);
}

.pager a {
	text-decoration: none;
	color: var(--ink-soft);
}

.pager a:hover {
	color: var(--accent);
}

.pager a b {
	display: block;
	color: var(--ink);
	font-weight: 600;
}

/* Fortschrittsbalken der Seite */
.progress {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	margin: 1.5rem 0 0;
	padding: 0.7rem 0.9rem;
	border: 1px solid var(--line-soft);
	border-radius: var(--radius);
	background: var(--paper-soft);
	font-size: 0.85rem;
	color: var(--ink-soft);
	max-width: var(--measure);
}

.progress .meter {
	flex: 1 1 auto;
	margin: 0;
}

.progress button {
	font-size: 0.75rem;
	background: none;
	border: 0;
	color: var(--ink-faint);
	cursor: pointer;
	text-decoration: underline;
	padding: 0;
}

.progress button:hover {
	color: var(--flag);
}

/* --- DOM-Baum (Loesung zu Uebung 2) ------------------------------------- */

.domtree {
	font-family: var(--mono);
	font-size: 0.78rem;
	overflow-x: auto;
	padding: 0.5rem 0;
}

.domtree ul {
	list-style: none;
	padding-left: 1.4rem;
	margin: 0;
	position: relative;
}

.domtree > ul {
	padding-left: 0;
}

.domtree li {
	position: relative;
	padding: 0.15rem 0 0.15rem 0;
	margin: 0;
}

.domtree ul ul li::before {
	content: "";
	position: absolute;
	left: -0.85rem;
	top: 0;
	bottom: 50%;
	border-left: 1px solid var(--line);
	border-bottom: 1px solid var(--line);
	width: 0.7rem;
}

.domtree ul ul li:not(:last-child)::after {
	content: "";
	position: absolute;
	left: -0.85rem;
	top: 50%;
	bottom: 0;
	border-left: 1px solid var(--line);
}

.domtree b {
	display: inline-block;
	border: 1px solid var(--line);
	border-radius: 4px;
	padding: 0.05rem 0.4rem;
	background: var(--paper);
	font-weight: 500;
	color: var(--code-tag);
}

/* --- Diverses ------------------------------------------------------------ */

.qr {
	display: inline-flex;
	align-items: baseline;
	gap: 0.3rem;
}

.linkrow {
	display: flex;
	flex-wrap: wrap;
	gap: 0.4rem;
	margin: 1.2rem 0;
	padding: 0;
	list-style: none;
}

.linkrow a {
	display: inline-block;
	font-size: 0.83rem;
	padding: 0.28rem 0.7rem;
	border: 1px solid var(--line);
	border-radius: 999px;
	text-decoration: none;
	color: var(--ink-soft);
	background: var(--paper);
	transition: border-color 0.15s ease, color 0.15s ease;
}

.linkrow a:hover {
	border-color: var(--accent);
	color: var(--accent);
}

.linkrow a::after {
	content: " ↗";
	color: var(--ink-faint);
}

table.data {
	border-collapse: collapse;
	width: 100%;
	font-size: 0.9rem;
	margin: 1.4rem 0;
}

table.data th,
table.data td {
	text-align: left;
	padding: 0.5rem 0.7rem;
	border-bottom: 1px solid var(--line-soft);
	vertical-align: top;
}

table.data th {
	font-size: 0.78rem;
	text-transform: uppercase;
	letter-spacing: 0.06em;
	color: var(--ink-faint);
}

.visually-hidden {
	position: absolute;
	width: 1px;
	height: 1px;
	overflow: hidden;
	clip: rect(0 0 0 0);
	white-space: nowrap;
}

@media print {
	.topbar,
	.minitoc,
	.wb__bar,
	.wb__status,
	.pager,
	.progress {
		display: none;
	}

	.layout {
		display: block;
	}

	details.sol {
		border-style: solid;
	}

	details.sol > .sol__body {
		display: block !important;
	}
}

/* Wer keine Bewegung sehen will, bekommt keine -- die Uebergaenge oben sind
   Zierde, keine Informationstraeger, es geht also nichts verloren. */
@media (prefers-reduced-motion: reduce) {
	*,
	*::before,
	*::after {
		animation-duration: 0.001ms !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.001ms !important;
		scroll-behavior: auto !important;
	}
}