:root {
    --color-bg: #ffffff;
    --color-text: #1a1a1a;
    --color-accent: #e63946; /* Swiss Red */
    --color-muted: #f1f1f1;
    --color-border: #000000;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --spacing-unit: 8px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-main);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 calc(var(--spacing-unit) * 4);
}

header {
    border-bottom: 2px solid var(--color-border);
    padding: calc(var(--spacing-unit) * 3) 0;
}

#app-title {
    font-size: 1.5rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: -0.05em;
}

main {
    padding: calc(var(--spacing-unit) * 6) 0;
}

section {
    margin-bottom: calc(var(--spacing-unit) * 8);
}

#curriculum-roadmap {
    margin-bottom: calc(var(--spacing-unit) * 4);
}

#hero {
    padding: calc(var(--spacing-unit) * 12) 0;
    text-align: center;
}

#hero h2 {
    font-size: 1.8rem;
    margin-bottom: calc(var(--spacing-unit) * 4);
    overflow-wrap: break-word;
    word-break: break-word;
}

#hero p {
    font-size: 1.1rem;
    margin-bottom: calc(var(--spacing-unit) * 5);
    color: #444;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    overflow-wrap: break-word;
    word-break: break-word;
}

.hero-actions {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin: calc(var(--spacing-unit) * 3) 0 calc(var(--spacing-unit) * 1);
}

.route-check {
    max-width: 760px;
    margin: 0 auto 12px;
    padding: 14px 18px;
    border: 1px solid var(--color-border);
    text-align: left;
}

.route-check legend {
    padding: 0 6px;
    font-weight: 800;
    text-align: center;
}

.route-check label {
    display: inline-flex;
    align-items: flex-start;
    gap: 8px;
    margin: 4px 14px 4px 0;
    cursor: pointer;
}

.route-check input,
.math-check-option input {
    accent-color: var(--color-accent);
    margin-top: 5px;
}

.route-recommendation {
    max-width: 72ch;
    margin: 0 auto 16px;
    padding: 8px 12px;
    background: var(--color-muted);
    font-weight: 600;
}

.hero-overview-btn {
    display: block;
    margin: 4px auto 0;
    padding: 8px 10px;
    border: 0;
    background: transparent;
    color: var(--color-text);
    font: inherit;
    text-decoration: underline;
    text-underline-offset: 4px;
    cursor: pointer;
}

.hero-overview-btn:hover {
    color: var(--color-text);
    background: var(--color-muted);
}

.hero-overview-btn:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 3px;
}

.btn-primary:focus-visible,
.btn-secondary:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 3px;
}

.roadmap-description {
    max-width: 72ch;
    margin: 0 0 calc(var(--spacing-unit) * 2);
    color: #444;
}

h2, h3 {
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: calc(var(--spacing-unit) * 2);
    overflow-wrap: break-word;
    word-break: break-word;
    hyphens: auto;
}

h2 { font-size: 1.5rem; line-height: 1.2; }
h3 { font-size: 1.1rem; }

.btn-primary, .btn-secondary {
    display: inline-block;
    padding: 12px 24px;
    border: 2px solid var(--color-border);
    background: var(--color-text);
    color: var(--color-bg);
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s ease;
}

.btn-primary:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-text);
}

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

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

.hidden {
    display: none !important;
}

/* Roadmap Styles */
#curriculum-roadmap {
    display: block;
}

.roadmap-section {
    margin-bottom: 0;
}

.roadmap-section h2 {
    font-size: 1.2rem;
    margin-bottom: calc(var(--spacing-unit) * 2);
    padding-bottom: var(--spacing-unit);
    border-bottom: 1px solid var(--color-border);
    overflow-wrap: break-word;
    word-break: break-word;
}

.roadmap-section .level {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    color: #666;
    display: block;
    margin-top: calc(var(--spacing-unit) * 1);
    overflow-wrap: break-word;
    word-break: break-word;
}

.roadmap-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-bottom: calc(var(--spacing-unit) * 8);
}

.roadmap-card {
    border: 1px solid var(--color-border);
    padding: 28px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
}

.roadmap-card:hover {
    transform: translateY(-4px);
    box-shadow: 8px 8px 0 var(--color-accent);
}

.roadmap-card.completed {
    border-left: 8px solid var(--color-accent);
}

.roadmap-card h4 {
    font-size: 1.0rem;
    margin-bottom: 4px;
    overflow-wrap: break-word;
    word-break: break-word;
}

/* Progress Bar */
.progress-bar-wrapper {
    width: 100%;
    height: 12px;
    background: var(--color-muted);
    border: 1px solid var(--color-border);
    margin: 16px 0;
}

#progress-text {
    font-weight: 700;
    margin-top: var(--spacing-unit);
    margin-bottom: calc(var(--spacing-unit) * 4);
}

#back-to-roadmap {
    margin-bottom: calc(var(--spacing-unit) * 8);
}

#content-area h2 {
    font-size: 1.75rem;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: calc(var(--spacing-unit) * 2);
    font-weight: 800;
}

#content-area p {
    margin-bottom: calc(var(--spacing-unit) * 4);
}

#content-area .btn-primary,
#content-area .btn-secondary {
    margin-top: 0;
}

#progress-bar {
    height: 100%;
    background: var(--color-accent);
    width: 0%;
    transition: width 0.5s ease;
}

/* Content Area Styles */
#content-area {
    line-height: 1.75;
}

#content-area h2 {
    font-size: 1.5rem;
    margin-bottom: calc(var(--spacing-unit) * 2);
    font-weight: 800;
    letter-spacing: -0.02em;
    overflow-wrap: break-word;
    word-break: break-word;
}

#content-area h3 {
    font-size: 1.1rem;
    margin-top: calc(var(--spacing-unit) * 5);
    margin-bottom: calc(var(--spacing-unit) * 2);
    font-weight: 800;
    letter-spacing: -0.02em;
    border-left: 6px solid var(--color-accent);
    padding-left: 12px;
    line-height: 1.3;
    overflow-wrap: break-word;
    word-break: break-word;
}

#content-area p {
    margin-bottom: calc(var(--spacing-unit) * 4);
    overflow-wrap: break-word;
    word-break: break-word;
}

#content-area ul, #content-area ol {
    margin-bottom: calc(var(--spacing-unit) * 4);
    padding-left: calc(var(--spacing-unit) * 4);
}

#content-area li {
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    overflow-wrap: break-word;
    word-break: break-word;
}

#content-area strong {
    font-weight: 700;
}

#content-area em {
    font-style: italic;
}

.formula {
    background: #f5f5f5;
    border: 1px solid var(--color-border);
    padding: calc(var(--spacing-unit) * 2);
    margin: calc(var(--spacing-unit) * 4) 0;
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    overflow-x: auto;
    white-space: normal;
    word-break: break-word;
    line-height: 1.4;
}

.formula p {
    margin-bottom: 0;
    text-align: center;
}

/* ---------- Tabellen im Lerntext ---------- */
#content-area .table-wrap {
    overflow-x: auto;
    margin: calc(var(--spacing-unit) * 4) 0;
}

#content-area table {
    border-collapse: collapse;
    margin: calc(var(--spacing-unit) * 4) 0;
    max-width: 100%;
}

#content-area .table-wrap table {
    margin: 0;
}

#content-area th,
#content-area td {
    border: 2px solid var(--color-border);
    padding: 12px 16px;
    text-align: center;
    font-variant-numeric: tabular-nums;
}

#content-area th {
    background: var(--color-text);
    color: var(--color-bg);
}

/* MathJax: lange Formeln scrollen im Kasten statt herauszuragen */
mjx-container[jax='CHTML'][display='false'] {
    display: inline-block;
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    vertical-align: middle;
}

mjx-container[jax='CHTML'][display='true'] {
    display: block;
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    padding-bottom: 4px;
}

.info-box {
    background: #f0f7ff;
    border-left: 4px solid #0066cc;
    padding: calc(var(--spacing-unit) * 2);
    margin: calc(var(--spacing-unit) * 4) 0;
    overflow-wrap: break-word;
    word-break: break-word;
}

.info-box h4 {
    margin-top: 0;
    margin-bottom: calc(var(--spacing-unit) * 1);
    font-size: 1.0rem;
    font-weight: 700;
    color: #0066cc;
}

.info-box ul, .info-box ol {
    margin-bottom: 0;
}

.info-box li {
    margin-bottom: calc(var(--spacing-unit) * 0.5);
}

.warning-box {
    background: #fff5f5;
    border-left: 4px solid var(--color-accent);
    padding: calc(var(--spacing-unit) * 2);
    margin: calc(var(--spacing-unit) * 4) 0;
    overflow-wrap: break-word;
    word-break: break-word;
}

.warning-box h4 {
    margin-top: 0;
    margin-bottom: calc(var(--spacing-unit) * 1);
    font-size: 1.0rem;
    font-weight: 700;
    color: var(--color-accent);
}

.warning-box ul, .warning-box ol {
    margin-bottom: 0;
}

.warning-box li {
    margin-bottom: calc(var(--spacing-unit) * 0.5);
}

footer {
    margin-top: calc(var(--spacing-unit) * 12);
    border-top: 1px solid var(--color-border);
    padding: 40px 0;
    text-align: center;
    font-size: 0.875rem;
}

/* ============================================================
   WP4 – Komponenten für Phase 2 (Swiss Design, scharfe Kanten)
   ============================================================ */

button, input, textarea, select {
    border-radius: 0;
}

/* ---------- Header-Navigation ---------- */
.header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

#main-nav {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.nav-btn {
    display: inline-block;
    padding: 8px 16px;
    border: 2px solid var(--color-border);
    background: var(--color-text);
    color: var(--color-bg);
    font-family: var(--font-main);
    font-weight: 700;
    font-size: 0.8rem;
    cursor: pointer;
}

.nav-btn:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: #fff;
}

.nav-btn-ghost {
    background: transparent;
    color: var(--color-text);
}

.nav-btn-ghost:hover {
    background: var(--color-text);
    border-color: var(--color-border);
    color: var(--color-bg);
}

/* ---------- Roadmap-Badges ---------- */
.roadmap-card .mod-icon {
    font-size: 28px;
    margin-bottom: 8px;
}

.score-badge {
    display: inline-block;
    border: 2px solid var(--color-border);
    padding: 2px 8px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-top: 8px;
}

.score-badge.done {
    background: var(--color-text);
    color: var(--color-bg);
}

/* ---------- Geführtes Beispiel ---------- */
.example {
    position: relative;
    border: 2px solid var(--color-border);
    background: #f5f5f5;
    padding: calc(var(--spacing-unit) * 3);
    padding-top: calc(var(--spacing-unit) * 5);
    margin: calc(var(--spacing-unit) * 4) 0;
}

.example::before {
    content: 'Beispiel';
    position: absolute;
    top: -2px;
    left: -2px;
    background: var(--color-text);
    color: var(--color-bg);
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    padding: 2px 10px;
}

/* ---------- Quiz ---------- */
.quiz-block {
    margin: calc(var(--spacing-unit) * 4) 0;
}

.quiz-status {
    font-weight: 700;
    margin: 8px 0;
}

.quiz-q {
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.quiz-qtext {
    font-weight: 600;
}

.quiz-opts {
    margin: 6px 0;
}

.quiz-opt {
    display: block;
    width: 100%;
    text-align: left;
    border: 2px solid var(--color-border);
    background: #fff;
    color: var(--color-text);
    font-family: var(--font-main);
    font-size: 1rem;
    padding: 10px 14px;
    margin: 8px 0;
    cursor: pointer;
}

.quiz-opt:hover:not(:disabled) {
    background: var(--color-muted);
}

.quiz-opt.correct {
    border-color: #1a7a3a;
    color: #1a7a3a;
    font-weight: 700;
}

.quiz-opt.wrong {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.quiz-explain {
    border-left: 4px solid var(--color-border);
    background: #f5f5f5;
    padding: 10px 14px;
    margin: 8px 0 16px;
    font-size: 0.9rem;
}

.joy-badge {
    display: inline-block;
    border: 2px solid var(--color-accent);
    color: var(--color-accent);
    font-weight: 800;
    padding: 6px 12px;
    margin: 8px 0;
}

/* ---------- Term-Chips + Tooltip ---------- */
[data-term], .term-chip {
    text-decoration: underline dotted;
    text-underline-offset: 2px;
    cursor: pointer;
}

[data-term]:hover, .term-chip:hover {
    color: var(--color-accent);
}

.term-tip {
    position: fixed;
    z-index: 80;
    max-width: 280px;
    background: #1a1a1a;
    color: #fff;
    padding: 10px 12px;
    font-size: 0.875rem;
    border-radius: 0;
}

.term-tip button {
    margin-top: 8px;
    border: 2px solid #fff;
    background: transparent;
    color: #fff;
    font-family: var(--font-main);
    padding: 4px 8px;
    cursor: pointer;
}

/* ---------- Glossar-Modal ---------- */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 70;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.modal {
    background: #fff;
    border: 2px solid var(--color-border);
    border-radius: 0;
    max-height: 80vh;
    overflow-y: auto;
    padding: 16px;
    max-width: 560px;
    width: 100%;
}

.modal-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.modal-head h3 {
    margin-bottom: 0;
}

.gloss-search {
    width: 100%;
    border: 2px solid var(--color-border);
    border-radius: 0;
    padding: 6px 8px;
    font-family: var(--font-main);
    font-size: 1rem;
    margin-bottom: 8px;
}

.gloss-entry {
    border-bottom: 1px solid #ddd;
    padding: 12px 0;
}

.gloss-entry p {
    margin-bottom: 4px;
}

.gloss-entry button {
    background: none;
    border: none;
    padding: 0;
    font-family: var(--font-main);
    font-size: 0.875rem;
    color: var(--color-accent);
    cursor: pointer;
    text-decoration: underline;
}

/* ---------- Interaktive Panels ---------- */
.interactive-panel {
    border: 2px solid var(--color-border);
    background: #fff;
    border-radius: 0;
    padding: 20px;
    margin: 20px 0;
    max-width: 100%;
}

.interactive-panel .slider-row {
    display: grid;
    grid-template-columns: 150px 1fr 90px;
    gap: 8px;
    align-items: center;
    margin: 12px 0;
}

.interactive-panel .slider-row label {
    font-weight: 600;
    font-size: 0.875rem;
}

.interactive-panel .slider-row output {
    text-align: right;
    font-variant-numeric: tabular-nums;
    font-size: 0.875rem;
}

/* Eigener Wert (IQR-Explorer): Button-Spalte wächst mit dem Text statt 90 px */
.interactive-panel .slider-row.iqr-custom-row {
    grid-template-columns: 150px 1fr auto;
}

.interactive-panel input[type='range'] {
    width: 100%;
}

.interactive-panel input[type='text'],
.interactive-panel textarea {
    width: 100%;
    border: 2px solid var(--color-border);
    border-radius: 0;
    padding: 6px 8px;
    font-family: var(--font-main);
    font-size: 1rem;
}

.interactive-panel .readout-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 16px 0;
}

.interactive-panel .readout {
    border: 2px solid var(--color-border);
    border-radius: 0;
    padding: 6px 10px;
    min-width: 110px;
}

.interactive-panel .readout .k {
    font-size: 0.75rem;
    color: #555;
}

.interactive-panel .readout .v {
    font-size: 1.25rem;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
}

.interactive-panel .btn-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 12px 0;
}

.interactive-panel button {
    border: 2px solid var(--color-border);
    border-radius: 0;
    background: #fff;
    color: var(--color-text);
    font-family: var(--font-main);
    font-weight: 600;
    padding: 6px 12px;
    cursor: pointer;
}

.interactive-panel button.active,
.interactive-panel button.primary {
    background: #1a1a1a;
    color: #fff;
}

.interactive-panel .chart-wrap {
    position: relative;
    height: 280px;
    max-height: 380px;
    margin-top: 16px;
}

.interactive-panel .chart-wrap canvas,
.interactive-panel canvas.reg {
    max-width: 100%;
}

.interactive-panel .hint {
    font-size: 0.8125rem;
    color: #555;
    margin-top: 6px;
}

.interactive-panel .badge-ok {
    border: 2px solid #1a7a3a;
    color: #1a7a3a;
    padding: 2px 8px;
    font-weight: 700;
}

.interactive-panel .badge-no {
    border: 2px solid var(--color-accent);
    color: var(--color-accent);
    padding: 2px 8px;
    font-weight: 700;
}

.interactive-panel .mini-quiz {
    margin-top: 12px;
}

.interactive-panel .boxplot {
    max-width: 100%;
}

/* Richtungs-Labor (m2-3): editierbare 2×2-Tafel */
.interactive-panel .cond-wrap {
    overflow-x: auto;
    margin: 12px 0;
}

.interactive-panel .cond-table {
    border-collapse: collapse;
}

.interactive-panel .cond-table th,
.interactive-panel .cond-table td {
    border: 2px solid var(--color-border);
    padding: 12px 16px;
    text-align: center;
    font-size: 0.9rem;
}

.interactive-panel .cond-table input[type='number'] {
    width: 72px;
    border: 2px solid var(--color-border);
    border-radius: 0;
    padding: 4px 6px;
    font: inherit;
    text-align: right;
}

.interactive-panel .case-table-wrap {
    overflow-x: auto;
    margin: 12px 0;
}

.interactive-panel .case-table {
    border-collapse: collapse;
    min-width: 360px;
    width: 100%;
}

.interactive-panel .case-table th,
.interactive-panel .case-table td {
    border: 1px solid var(--color-border);
    padding: 8px 12px;
    text-align: left;
}

.interactive-panel .case-table th {
    background: #f4f4f4;
}

.interactive-panel .data-issues {
    display: grid;
    gap: 10px;
    margin: 14px 0;
}

.interactive-panel .data-issues label {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    line-height: 1.5;
}

.interactive-panel .data-issues input {
    flex: 0 0 auto;
    margin-top: 4px;
}

.interactive-panel .measurement-plot {
    border: 1px solid var(--color-border);
    margin: 12px 0;
}

.interactive-panel .measurement-plot svg {
    display: block;
    width: 100%;
    max-height: 190px;
}

.interactive-panel .measurement-plot text {
    fill: var(--color-text);
    font: 12px var(--font-main);
}

.interactive-panel .scenario-feedback,
.interactive-panel .data-check-feedback {
    border-left: 4px solid var(--color-accent);
    margin: 14px 0 4px;
    padding: 8px 12px;
    line-height: 1.55;
}

/* ---------- Modul-Navigation ---------- */
.module-nav {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin: 24px 0;
}

.interactive-slot,
.quiz-slot {
    margin: 12px 0;
    max-width: 100%;
}

.hook {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.math-reference,
.math-check {
    border: 2px solid var(--color-border);
    padding: 18px;
    margin: 28px 0;
}

.math-reference {
    background: var(--color-muted);
}

.math-reference h3,
.math-check h3 {
    margin-bottom: 8px;
}

.math-reference-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.math-reference-link,
.math-check-link {
    max-width: 100%;
    margin: 4px 0;
    text-align: left;
}

.math-check-form {
    margin-top: 20px;
}

.math-check-question {
    min-width: 0;
    margin: 0 0 14px;
    padding: 12px 14px;
    border: 1px solid var(--color-border);
}

.math-check-question legend {
    max-width: 100%;
    padding: 0 5px;
    font-weight: 800;
}

.math-check-option {
    display: inline-flex;
    align-items: flex-start;
    gap: 5px;
    margin: 4px 16px 4px 0;
    cursor: pointer;
}

.math-check-results {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin: 16px 0;
}

.math-check-result {
    min-width: 0;
    padding: 14px;
    border: 1px solid var(--color-border);
    border-left: 6px solid var(--color-accent);
}

.math-check-result.is-ready {
    border-left-color: #39845b;
}

.math-check-result h4 {
    margin-bottom: 6px;
}

.math-check-result .math-check-status {
    font-weight: 800;
}

.math-check-result ul {
    margin: 8px 0 12px 20px;
}

/* Lesezeile begrenzen: Fließtext schmal (72ch), Interaktiv/Charts bleiben breit */
.hook,
#module-content p,
#module-content li,
.quiz-qtext,
.quiz-explain {
    max-width: 72ch;
}

/* ---------- Responsiv ---------- */
@media (max-width: 700px) {
    .container {
        padding: 0 16px;
    }

    .roadmap-grid {
        grid-template-columns: 1fr;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
        max-width: 440px;
        margin-right: auto;
        margin-left: auto;
    }

    .hero-actions button {
        width: 100%;
    }

    .route-check label {
        display: flex;
        margin-right: 0;
    }

    .math-check {
        padding: 14px;
    }

    .math-check-results {
        grid-template-columns: 1fr;
    }

    .math-check-option {
        display: flex;
        margin-right: 0;
    }

    .interactive-panel .slider-row {
        grid-template-columns: 1fr;
    }

    .interactive-panel .slider-row.iqr-custom-row {
        grid-template-columns: 1fr;
    }

    .interactive-panel .slider-row output {
        text-align: left;
    }

    .interactive-panel input[type='range'] {
        width: 100%;
    }

    .interactive-panel .chart-wrap {
        height: 240px;
    }

    .interactive-panel .readout {
        min-width: 0;
        flex: 1 1 45%;
    }

    .modal-backdrop {
        padding: 8px;
    }

    .header-row {
        flex-direction: column;
        align-items: stretch;
    }
}

/* ---------- Übungsaufgaben (nativ details/summary, offline-fähig) ---------- */
details.practice {
    border: 2px solid var(--color-border);
    border-radius: 0;
    background: #fff;
    padding: 12px 16px;
    margin: 12px 0;
    max-width: 100%;
}

details.practice > summary {
    font-weight: 800;
    cursor: pointer;
}

details.practice .practice-task {
    margin-top: 8px;
    max-width: 72ch;
}

details.practice .practice-task p {
    margin-bottom: calc(var(--spacing-unit) * 2);
}

details.practice-solution {
    margin-top: 12px;
    border: 2px solid var(--color-border);
    border-radius: 0;
    background: #f5f5f5;
    padding: 8px 12px;
}

details.practice-solution > summary {
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
}

.practice-solution-body {
    margin-top: 8px;
    max-width: 72ch;
}

.practice-solution-body p {
    margin-bottom: calc(var(--spacing-unit) * 2);
}