:root {
  --bg: #efe6c9;
  --paper: #ffffff;
  --box: #fff7ec;
  --ink: #1f2328;
  --muted: #4c5b66;
  --accent: #1c5d8c;
  --border: #e3d9c5;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Source Serif 4", "Merriweather", "Georgia", serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
}

h1, h2 {
  font-family: "Source Sans 3", "Gill Sans", "Trebuchet MS", sans-serif;
  margin: 0 0 0.6rem;
}

p {
  margin: 0 0 1rem;
}

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

.container {
  width: min(1200px, 98vw);
  margin: 0 auto;
}

.hero {
  padding: 2rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
  background: #fffdf8;
}

.hero-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.hero-inner > div {
  width: 100%;
  text-align: center;
}

.nav-toggle {
  border: 1px solid var(--border);
  background: var(--paper);
  color: var(--accent);
  padding: 0.4rem 0.8rem;
  cursor: pointer;
}

.page {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  width: min(1400px, 98vw);
  margin: 0 auto;
  padding: 1rem 0 2rem;
}

.side-nav {
  background: var(--box);
  border: 1px solid var(--border);
  padding: 0.8rem;
  position: sticky;
  top: 1rem;
  align-self: start;
  max-height: none;
  overflow: visible;
  transform: translateX(-110%);
}

.nav-open .side-nav {
  transform: translateX(0);
}

.side-nav nav {
  display: grid;
  gap: 0.5rem;
}

.content {
  background: var(--box);
  border: 1px solid var(--border);
  padding: 1.4rem 1.6rem 1.8rem;
}

.panel {
  display: none;
  padding: 0;
}

.panel.is-active {
  display: block;
}

.section-footer-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

.section-footer-nav--single {
  justify-content: center;
}

.section-nav-btn {
  font: inherit;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--border);
  background: #f7efe1;
  color: var(--ink);
  cursor: pointer;
}

.section-nav-btn:hover {
  background: #efe4cf;
}

.section-nav-btn--next {
  margin-left: auto;
}

.lead {
  color: var(--muted);
}

.article {
  margin-top: 1rem;
  border: 1px solid var(--border);
  background: #fffdf8;
  padding: 0.6rem 1rem 1rem;
}

.quote-box {
  margin-bottom: 1rem;
}

.task-quote {
  margin: 1rem 0;
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--accent);
  background: #fffdf8;
  color: var(--text-muted, #444);
  font-style: italic;
  word-break: break-all;
  overflow-wrap: break-word;
}

.rle-einstieg-pattern {
  margin: 0;
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--accent);
  background: #fffdf8;
  font-size: 1.05rem;
  line-height: 1.6;
  word-break: break-word;
}

.article summary {
  cursor: pointer;
  color: var(--accent);
}

.gloss {
  cursor: help;
  border-bottom: 1px dotted rgba(0,0,0,0.12);
  color: var(--accent);
  position: relative;
  display: inline-block;
  z-index: 1;
}

.gloss-material-folder {
  cursor: pointer;
}
.gloss::after {
  content: attr(data-tooltip);
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: calc(100% + 8px);
  background: #122;
  color: #fff;
  padding: 6px 8px;
  white-space: normal;
  width: min(420px, 85vw);
  text-align: left;
  line-height: 1.35;
  font-size: 0.85rem;
  border-radius: 4px;
  display: none;
  box-shadow: 0 4px 10px rgba(0,0,0,0.15);
  overflow-wrap: break-word;
  z-index: 9999;
  pointer-events: none;
}
.gloss::before {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: calc(100% + 4px);
  border: 6px solid transparent;
  border-top-color: #122;
  display: none;
  z-index: 9999;
  pointer-events: none;
}
.gloss:hover::after,
.gloss:hover::before {
  display: block;
}

/* JS-applied classes for viewport-safe tooltip positioning */
.gloss-tt-bottom::after {
  bottom: auto !important;
  top: calc(100% + 10px);
}
.gloss-tt-bottom::before {
  bottom: auto !important;
  top: calc(100% + 2px);
  border-top-color: transparent;
  border-bottom-color: #122;
}
.gloss-tt-left::after {
  left: 0 !important;
  transform: none !important;
}
.gloss-tt-right::after {
  left: auto !important;
  right: 0 !important;
  transform: none !important;
}

.section-task {
  border-top: 2px solid var(--border);
  border-left: 6px solid var(--accent);
  background: rgba(28,93,140,0.08);
  padding: 0.7rem 1rem;
  margin-bottom: 1.5rem;
  margin-top: 1.25rem;
}

.section-task:last-child {
  margin-bottom: 0;
}

.task-intro {
  border-left: 4px solid var(--accent);
  background: rgba(28, 93, 140, 0.12);
  padding: 0.65rem 0.9rem;
  margin: 0.6rem 0 0.85rem;
  border-radius: 0 4px 4px 0;
}

.section-frame.task-intro {
  border: 1px solid rgba(28, 93, 140, 0.25);
  border-left: 4px solid var(--accent);
  background: rgba(28, 93, 140, 0.12);
  color: var(--ink);
  font-style: normal;
}

.task-challenges {
  border: 1px solid var(--border);
  border-left: 4px solid #3f8f4b;
  background: rgba(63, 143, 75, 0.08);
  padding: 0.65rem 0.9rem;
  margin: 0.5rem 0 0.85rem;
  border-radius: 0 4px 4px 0;
}

.task-challenges-title {
  margin: 0 0 0.35rem;
  font-weight: 700;
  font-size: 0.95rem;
  color: #2d6a38;
}

.task-challenges ul {
  margin: 0.4rem 0 0;
  padding-left: 1.25rem;
}

.task-challenges li {
  margin: 0.2rem 0;
  font-size: 0.9rem;
}

.task-label {
  font-weight: 700;
  display: block;
  margin-bottom: 0.5rem;
}

.intro-calc {
  display: grid;
  gap: 0.4rem;
  margin: 0.6rem 0;
}

.intro-task-grid {
  display: grid;
  gap: 1rem;
}

.rate-info {
  border: 1px solid var(--border);
  background: #fffdf8;
  padding: 0.6rem 0.7rem;
}

.rate-info p {
  margin: 0 0 0.45rem;
  font-size: 0.95rem;
}

.rate-info p:last-child {
  margin-bottom: 0;
}

.ui-mockup {
  border: 2px dashed var(--muted);
  background: var(--paper);
  padding: 1.5rem;
  margin: 1.5rem 0;
  font-family: monospace;
  text-align: center;
  color: var(--muted);
  border-radius: 4px;
}

.rate-info-title {
  font-weight: 700;
}

.intro-calc input,
.intro-calc button {
  max-width: 220px;
  padding: 0.4rem 0.55rem;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--ink);
  font: inherit;
}

.intro-calc button {
  cursor: pointer;
  background: #f7efe1;
}

.intro-result {
  margin: 0.5rem 0 0;
  color: var(--ink);
}

.sd-card-bar {
  position: relative;
  margin-top: 0.7rem;
  width: 100%;
  height: 1.4rem;
  border: 1px solid var(--border);
  background: #f7f2e6;
  overflow: hidden;
}

.sd-card-bar-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0;
  background: linear-gradient(90deg, #76b24f, #3f8f4b);
  transition: width 160ms ease;
}

.sd-card-bar-fill--overflow {
  background: linear-gradient(90deg, #d45b5b, #a92f2f);
}

.sd-card-bar-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  color: #122;
  mix-blend-mode: normal;
  pointer-events: none;
}

.assumption-task {
  margin-top: 1.2rem;
}

.help-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0.35rem 0 0.75rem;
  flex-wrap: nowrap;
}

.help-toggle {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 0;
  background: #f7efe1;
  color: var(--accent);
  font: inherit;
  cursor: pointer;
}

.help-box {
  display: block;
  flex: 1 1 auto;
  min-width: 0;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  background: #fffdf8;
  border-radius: 0;
}

.help-box[hidden] {
  display: none;
}

.help-box p {
  margin: 0;
  font-size: 0.95rem;
}

.assumption-textarea {
  width: 100%;
  min-height: 100px;
  padding: 0.6rem;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--ink);
  font-family: "Source Serif 4", "Merriweather", "Georgia", serif;
  font-size: 0.95rem;
  line-height: 1.5;
  border-radius: 3px;
}

.assumption-textarea--code {
  min-height: 220px;
  font-family: ui-monospace, "Cascadia Code", "Consolas", "Courier New", monospace;
  font-size: 0.9rem;
  line-height: 1.45;
  white-space: pre;
  tab-size: 4;
}

.side-nav nav a.nav-link {
  display: block;
  padding: 0.45rem 0.6rem;
  border-radius: 6px;
  transition: background-color 120ms ease, color 120ms ease;
}
.side-nav nav a.nav-link:hover {
  background: rgba(0,0,0,0.06);
  color: var(--ink);
}
.side-nav nav a.nav-link.is-active {
  background: rgba(28, 93, 140, 0.14);
  color: var(--accent);
  font-weight: 600;
}

.widget-placeholder {
  border: 2px dashed var(--muted);
  background: var(--paper);
  padding: 1.5rem;
  margin: 1rem 0;
  color: var(--muted);
  font-family: monospace;
  font-size: 0.9rem;
  text-align: center;
}

.task-title {
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.section-todo-placeholder {
  margin: 2rem 0 2.5rem;
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-align: center;
  color: var(--text-muted, #888);
}

.plenum-list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.6rem;
  margin-top: 0.6rem;
}

.plenum-list li {
  padding: 0.65rem 1rem;
  border-left: 4px solid var(--accent);
  background: rgba(28, 93, 140, 0.06);
}

.footer {
  padding: 1.8rem 0 2.6rem;
  color: var(--muted);
  text-align: center;
}

/* Narrative story passages */
.narrative-block {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem 1rem;
  align-items: start;
  padding: 0.85rem 1rem;
  margin-bottom: 1rem;
  border: 1px solid var(--border);
  border-left: 4px solid #8b6914;
  background: #fff9ee;
  border-radius: 4px;
}

.narrative-block-icon {
  font-size: 1.35rem;
  line-height: 1;
  opacity: 0.85;
  user-select: none;
}

.narrative-block-body p:last-child,
.narrative-block-body blockquote:last-child,
.narrative-block-body .quote-box:last-child {
  margin-bottom: 0;
}

/* Section framing */
.section-frame {
  padding: 0.65rem 0.9rem;
  margin: 0 0 1.25rem;
  border: 1px dashed var(--border);
  background: rgba(255, 253, 248, 0.9);
  color: var(--muted);
  font-style: italic;
}

/* Ethics form */
.ethics-form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin: 0.75rem 0 1rem;
}

.ethics-form label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--border);
  background: #fffdf8;
}

.ethics-bridge {
  margin-top: 1rem;
  padding: 0.65rem 0.85rem;
  border-left: 3px solid var(--accent);
  background: rgba(28, 93, 140, 0.06);
}

.reflection-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.reflection-item {
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.reflection-item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.reflection-statement {
  margin: 0 0 0.5rem;
}

.reflection-compare-label {
  margin: 0.85rem 0 0.35rem;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ink);
}

.reflection-compare {
  margin: 0;
  padding: 0.75rem 0.9rem;
  border-left: 3px solid var(--accent);
  background: rgba(28, 93, 140, 0.06);
  white-space: pre-wrap;
  font-family: inherit;
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--ink);
}

.reflection-compare--empty {
  color: var(--muted);
  font-style: italic;
}

/* Widget fullscreen */
.widget-shell {
  margin: 1rem 0;
  border: 1px solid var(--border);
  background: #fffdf8;
  border-radius: 4px;
  overflow: hidden;
  cursor: pointer;
}

.widget-shell-toolbar {
  display: flex;
  justify-content: stretch;
  padding: 0.4rem 0.6rem;
  border-bottom: 1px solid var(--border);
  background: rgba(28, 93, 140, 0.05);
}

.widget-fullscreen-open {
  font: inherit;
  font-size: 0.88rem;
  padding: 0.5rem 0.75rem;
  width: 100%;
  border: 1px solid var(--border);
  background: #f7efe1;
  color: var(--accent);
  cursor: pointer;
  text-align: center;
}

.widget-shell-body {
  padding: 0.5rem;
}

.widget-shell-body--preview {
  max-height: 200px;
  overflow: hidden;
  pointer-events: none;
  user-select: none;
  position: relative;
}

.widget-shell-body--preview::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3rem;
  background: linear-gradient(to bottom, transparent, #fffdf8);
  pointer-events: none;
}

.widget-shell-body--overlay {
  max-height: none;
  overflow: visible;
  padding: 1rem;
}

.widget-fullscreen-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: rgba(20, 24, 28, 0.72);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.widget-fullscreen-panel {
  width: min(1100px, 96vw);
  max-height: 92vh;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 6px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.widget-fullscreen-panel--with-sidebar .widget-fullscreen-body-row {
  flex: 1;
  min-height: 0;
}

.widget-fullscreen-header {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
  background: #fffdf8;
}

.widget-fullscreen-banner {
  flex: 1;
  margin: 0;
  padding: 0.35rem 0.6rem;
  font-size: 0.85rem;
  color: #a92f2f;
  background: #fff3f3;
  border: 1px solid #e8b4b4;
  border-radius: 3px;
  text-align: left;
}

.widget-fullscreen-banner[hidden] {
  display: none;
}

.widget-fullscreen-close {
  margin-left: auto;
  font: inherit;
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--border);
  background: #f7efe1;
  cursor: pointer;
}

.widget-fullscreen-content {
  overflow: auto;
  flex: 1;
}

body.widget-fullscreen-active {
  overflow: hidden;
}

.widget-fullscreen-panel--with-sidebar {
  width: min(1200px, 98vw);
}

.widget-fullscreen-body-row {
  display: flex;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.challenge-sidebar {
  width: 260px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  background: #fffdf8;
  overflow-y: auto;
  padding: 0.75rem;
}

.challenge-sidebar-inner {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  height: 100%;
}

.challenge-sidebar-title {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--ink);
}

.challenge-sidebar-list {
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1;
}

.challenge-sidebar-item {
  display: flex;
  gap: 0.5rem;
  align-items: flex-start;
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
  line-height: 1.4;
}

.challenge-sidebar-item--done {
  color: #3f8f4b;
}

.challenge-sidebar-item--just-done {
  animation: challenge-item-flash 0.85s ease-out;
}

@keyframes challenge-item-flash {
  0% {
    background: rgba(63, 143, 75, 0.55);
    box-shadow: 0 0 0 0 rgba(63, 143, 75, 0.6);
  }
  40% {
    background: rgba(63, 143, 75, 0.28);
    box-shadow: 0 0 0 4px rgba(63, 143, 75, 0.2);
  }
  100% {
    background: transparent;
    box-shadow: 0 0 0 0 transparent;
  }
}

.challenge-sidebar-item--failed {
  color: #a92f2f;
}

.challenge-sidebar-item--failed .challenge-sidebar-status {
  color: #a92f2f;
  font-weight: 700;
}

.challenge-sidebar-status {
  flex-shrink: 0;
  width: 1.1em;
  text-align: center;
  font-weight: 700;
}

.challenge-sidebar-reset {
  font: inherit;
  font-size: 0.85rem;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--border);
  background: #f7efe1;
  cursor: pointer;
  align-self: stretch;
}

.widget-fullscreen-panel--with-sidebar .widget-fullscreen-content {
  flex: 1;
  min-width: 0;
}

/* Sort / drag-drop widget */
.sort-widget-board {
  margin-bottom: 1rem;
}

.sort-widget-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
}

.sort-widget-column {
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 4px;
  min-height: 120px;
}

.sort-widget-column-title {
  margin: 0;
  padding: 0.45rem 0.6rem;
  font-weight: 700;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
  background: rgba(28, 93, 140, 0.06);
}

.sort-widget-dropzone {
  min-height: 80px;
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.sort-widget-dropzone--over {
  background: rgba(28, 93, 140, 0.08);
  outline: 2px dashed var(--accent);
}

.sort-widget-placed-card {
  font-size: 0.82rem;
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--border);
  background: #fffdf8;
  border-radius: 3px;
}

.sort-widget-placed-card--ok {
  border-color: #3f8f4b;
  background: rgba(63, 143, 75, 0.08);
}

.sort-widget-placed-card--bad {
  border-color: #a92f2f;
  background: rgba(169, 47, 47, 0.08);
}

.sort-widget-pool-label {
  margin: 0 0 0.5rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.sort-widget-cards {
  display: grid;
  gap: 0.65rem;
}

.sort-widget-card {
  border: 1px solid var(--border);
  background: #fffdf8;
  padding: 0.65rem 0.75rem;
  border-radius: 4px;
}

.sort-widget-card--dragging {
  opacity: 0.55;
}

.sort-widget-card-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

.sort-widget-card-desc {
  margin: 0 0 0.5rem;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.45;
}

.widget-divider {
  border: 0;
  border-top: 3px solid #5a6a78;
  margin: 1.25rem 0;
}

.bitflip-widget {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  margin: 0.75rem 0;
}

.bitflip-panel {
  display: flex;
  flex-direction: column;
  min-height: 17.5rem;
  background: var(--box);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1rem 1.1rem;
}

.bitflip-label {
  margin: 0 0 0.5rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.bitflip-encoding {
  font-weight: 400;
}

.bitflip-value {
  flex: 1;
  display: flex;
  align-items: center;
  font-family: monospace;
  font-size: 1.85rem;
  font-weight: 600;
  min-height: 12rem;
  word-break: break-all;
}

.bitflip-media {
  flex: 1;
  display: flex;
  align-items: center;
  min-height: 12rem;
}

.bitflip-canvas {
  display: block;
  flex-shrink: 0;
  width: 12rem;
  height: 12rem;
  image-rendering: pixelated;
  border: 1px solid var(--border);
  border-radius: 4px;
}

.bitflip-status {
  min-height: 1.25rem;
  margin: 0 0 0.65rem;
  font-size: 0.88rem;
}

.bitflip-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: auto;
  padding-top: 0.75rem;
}

.sort-widget-top-errors {
  margin: 0 0 0.75rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.88rem;
  color: #a92f2f;
  background: #fff3f3;
  border: 1px solid #e8b4b4;
  border-radius: 3px;
}

.sort-widget-top-errors[hidden] {
  display: none;
}

.sort-widget-guess--required {
  border-left: 3px solid var(--accent);
  padding-left: 0.65rem;
  margin-top: 0.5rem;
}

.sort-widget-guess-note {
  margin: 0 0 0.35rem;
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 600;
}

.format-detail-list {
  margin: 0.75rem 0 1rem;
}

.format-info-details {
  margin: 0.75rem 0 1rem;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  background: #fffdf8;
}

.format-info-details summary {
  cursor: pointer;
  color: var(--accent);
  font-weight: 600;
}

.format-info-details .format-detail-list {
  margin: 0.75rem 0 0;
}

.format-detail-list dt {
  font-weight: 700;
  margin-top: 0.85rem;
}

.format-detail-list dd {
  margin: 0.25rem 0 0;
  color: var(--ink);
  line-height: 1.5;
}
.sort-widget-status--ok { color: #3f8f4b; font-weight: 700; }
.sort-widget-status--bad { color: #a92f2f; font-weight: 700; }
.sort-widget-status--guess {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
}

.sort-widget-assign-btn {
  font: inherit;
  font-size: 0.78rem;
  margin: 0.2rem 0.35rem 0 0;
  padding: 0.2rem 0.45rem;
  border: 1px solid var(--border);
  background: #fff;
  cursor: pointer;
}

.sort-widget-guess {
  margin: 0.5rem 0;
}

.sort-widget-guess-label {
  display: block;
  font-size: 0.85rem;
  margin-bottom: 0.25rem;
}

.sort-widget-guess-input {
  width: 100%;
  font: inherit;
  font-size: 0.88rem;
  padding: 0.4rem;
  border: 1px solid var(--border);
}

.sort-widget-feedback {
  margin-top: 0.5rem;
  padding: 0.45rem 0.55rem;
  font-size: 0.88rem;
  border-left: 3px solid var(--accent);
  background: rgba(0, 0, 0, 0.03);
}

.sort-widget-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
  margin-top: 0.75rem;
}

.sort-widget-submit {
  padding: 0.45rem 1rem;
  font: inherit;
  background: var(--accent);
  color: #fff;
  border: none;
  cursor: pointer;
  font-weight: 600;
}

.sort-widget-reset {
  padding: 0.45rem 1rem;
  font: inherit;
  border: 1px solid var(--border);
  background: #f7efe1;
  cursor: pointer;
}

.sort-widget-errors {
  font-size: 0.9rem;
  color: #a92f2f;
}

.sort-widget-summary {
  margin-top: 0.75rem;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--border);
  background: #fffdf8;
}

.sort-widget-summary-all {
  margin: 0.35rem 0 0;
  color: #3f8f4b;
}

/* Challenge banner */
.challenge-banner {
  margin-bottom: 0.75rem;
  padding: 0.55rem 0.75rem;
  border-radius: 4px;
  font-size: 0.9rem;
}

.challenge-banner--pending {
  border: 1px solid var(--border);
  background: #fffdf8;
  color: var(--muted);
}

.challenge-banner--success {
  border: 1px solid #3f8f4b;
  background: rgba(63, 143, 75, 0.1);
  color: #2d6a38;
  font-weight: 600;
}

/* Step slideshow */
.step-slideshow {
  margin: 1rem 0;
  border: 1px solid var(--border);
  background: #fffdf8;
  padding: 0.75rem;
  border-radius: 4px;
}

.step-slideshow-stage {
  min-height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.5rem;
}

.step-slideshow-img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--border);
}

.step-slideshow-caption {
  margin: 0 0 0.65rem;
  font-size: 0.92rem;
  color: var(--muted);
  text-align: center;
}

.step-slideshow-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.step-slideshow-controls button {
  font: inherit;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--border);
  background: #f7efe1;
  cursor: pointer;
}

.step-slideshow-controls button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.step-slideshow-counter {
  font-size: 0.88rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* Bit table */
.bit-table {
  width: 100%;
  border-collapse: collapse;
  font-family: monospace;
  font-size: 0.75rem;
  margin: 0.5rem 0;
}

.bit-table th,
.bit-table td {
  border: 1px solid var(--border);
  padding: 2px 4px;
  text-align: center;
}

.bit-table .bit-flipped {
  background: #fde68a;
  font-weight: 700;
}

.task-subsection-title {
  font-weight: 700;
  margin: 1.25rem 0 0.5rem;
  padding-top: 0.75rem;
  border-top: 2px solid var(--border);
}

@media (min-width: 960px) {
  .page {
    grid-template-columns: 240px minmax(0, 1fr);
  }

  .side-nav {
    transform: translateX(0);
  }

  .nav-toggle {
    display: none;
  }

  .intro-task-grid {
    grid-template-columns: minmax(0, 1fr) 410px;
    align-items: start;
  }
}

/* Photo scenario widget (lossy closing) */
.photo-scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.photo-scenario-card {
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.75rem;
  background: #fff;
}

.photo-scenario-title {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
}

.photo-scenario-desc {
  margin: 0 0 0.65rem;
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.45;
}

.photo-scenario-preview-wrap {
  height: 110px;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: #e8e4dc;
  margin-bottom: 0.65rem;
}

.photo-scenario-preview-inner {
  width: 100%;
  height: 100%;
  display: flex;
}

.photo-scenario-mock {
  width: 100%;
  height: 100%;
  min-height: 110px;
  position: relative;
  overflow: hidden;
}

.photo-scenario-level-visual--mid .photo-scenario-plate,
.photo-scenario-level-visual--mid .photo-scenario-face,
.photo-scenario-level-visual--mid .photo-scenario-doc-line {
  filter: blur(0.6px);
}

.photo-scenario-level-visual--low .photo-scenario-plate,
.photo-scenario-level-visual--low .photo-scenario-face,
.photo-scenario-level-visual--low .photo-scenario-doc-line,
.photo-scenario-level-visual--low .photo-scenario-building {
  filter: blur(2px);
  opacity: 0.82;
}

.photo-scenario-mock--tatort {
  background: linear-gradient(#87ceeb 55%, #6b8e4e 55%);
}

.photo-scenario-sky {
  position: absolute;
  inset: 0 0 45% 0;
}

.photo-scenario-building {
  position: absolute;
  left: 12%;
  bottom: 18%;
  width: 45%;
  height: 52%;
  background: #8a8178;
  border-radius: 2px 2px 0 0;
}

.photo-scenario-plate {
  position: absolute;
  right: 8%;
  bottom: 22%;
  background: #fff;
  border: 2px solid #222;
  padding: 2px 6px;
  font-family: monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.photo-scenario-mock--person {
  background: linear-gradient(#d4c4b0, #a89078);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0;
}

.photo-scenario-face {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: #f0d5b8;
  border: 2px solid #8a6f55;
  margin-top: 8px;
}

.photo-scenario-shoulders {
  width: 80px;
  height: 28px;
  background: #4a5568;
  border-radius: 40px 40px 0 0;
  margin-top: -4px;
}

.photo-scenario-mock--doc {
  background: #f7f4ef;
  padding: 14px 16px;
}

.photo-scenario-doc-line {
  height: 6px;
  background: #bbb;
  border-radius: 2px;
  margin-bottom: 8px;
}

.photo-scenario-doc-line--title {
  width: 70%;
  height: 8px;
  background: #666;
}

.photo-scenario-doc-line--short {
  width: 45%;
}

.photo-scenario-levels {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.photo-scenario-level {
  flex: 1;
  min-width: 4.5rem;
  padding: 0.3rem 0.45rem;
  font-size: 0.78rem;
  border: 1px solid var(--border);
  background: var(--bg);
  cursor: pointer;
  border-radius: 3px;
}

.photo-scenario-level--active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  font-weight: 600;
}

.photo-scenario-meta {
  margin: 0 0 0.25rem;
  font-size: 0.8rem;
}

.photo-scenario-critical {
  margin: 0;
  font-size: 0.75rem;
  color: var(--muted);
}

.photo-scenario-warn {
  margin: 0.45rem 0 0;
  font-size: 0.78rem;
  color: #a92f2f;
  line-height: 1.4;
}

.fss-scenario {
  margin: 0.65rem 0 0.85rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #fffdf8;
}

.fss-scenario > summary,
.fss-scenario-open {
  display: block;
  width: 100%;
  box-sizing: border-box;
  cursor: pointer;
  padding: 0.55rem 0.85rem;
  font-weight: 600;
  font-family: "Source Sans 3", "Gill Sans", sans-serif;
  list-style-position: outside;
  text-align: left;
}

.fss-scenario-open {
  margin: 0;
  border: none;
  background: transparent;
  color: inherit;
  font-size: inherit;
  line-height: inherit;
}

.fss-scenario .widget-shell {
  display: none;
}

.fss-scenario[open] > summary {
  border-bottom: 1px solid var(--border);
}

.fss-scenario--success {
  background: #d8ecd9;
  border-color: #3f8f4b;
}

.fss-scenario--success > summary,
.fss-scenario--success .fss-scenario-open {
  color: #2d6a3a;
  background: #d8ecd9;
}

.widget-fullscreen-panel:has(.fss-sim--success) {
  background: #d8ecd9;
  border-color: #3f8f4b;
}

.widget-fullscreen-panel:has(.fss-sim--success) .widget-fullscreen-header {
  background: #c8e6cc;
  border-bottom-color: #3f8f4b;
}

.widget-fullscreen-panel:has(.fss-sim--success) .widget-fullscreen-content,
.widget-fullscreen-panel:has(.fss-sim--success) .widget-shell-body--overlay {
  background: #d8ecd9;
}

.widget-fullscreen-panel--challenges-done {
  border-color: #3f8f4b;
}

.widget-fullscreen-panel--challenges-done .widget-fullscreen-header {
  background: #c8e6cc;
  border-bottom-color: #3f8f4b;
}

.widget-fullscreen-panel--challenges-flash {
  animation: challenge-panel-flash 0.9s ease-out;
}

@keyframes challenge-panel-flash {
  0% {
    box-shadow: 0 0 0 0 rgba(63, 143, 75, 0.55);
    background: #d8ecd9;
  }
  100% {
    box-shadow: 0 0 0 12px transparent;
    background: #fffdf8;
  }
}

.widget-fullscreen-close--challenges-open {
  border-color: #c9a227;
  background: #fff6d6;
  color: #6b5500;
}

.fss-sim--success {
  background: #d8ecd9;
}

.fss-panel--success {
  background: #d8ecd9;
}

.fss-panel {
  padding: 0.75rem 0.85rem 0.9rem;
}

.fss-toolbar {
  margin-bottom: 0.65rem;
}

.fss-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.fss-tool-hint {
  margin: 0.45rem 0 0;
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.45;
}

.fss-archive-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 0.55rem;
  padding: 0.45rem 0.6rem;
  border-radius: 3px;
  background: rgba(108, 52, 131, 0.08);
  font-size: 0.82rem;
}

.fss-archive-btn {
  border: 1px solid #6c3483;
  background: #6c3483;
  color: #fff;
  padding: 0.35rem 0.75rem;
  border-radius: 3px;
  cursor: pointer;
  font-family: "Source Sans 3", "Gill Sans", sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
}

.fss-archive-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.fss-stats-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  margin-bottom: 0.55rem;
  padding: 0.55rem 0.7rem;
  border-radius: 4px;
  border: 2px solid #b0bec5;
  background: #eceff1;
  font-size: 0.88rem;
  font-weight: 600;
  color: #263238;
  font-family: "Source Sans 3", "Gill Sans", sans-serif;
}

.fss-stats-row--over {
  border-color: #c0392b;
  background: #fdecea;
  color: #7a1f16;
}

.fss-stats-row--ok {
  border-color: #3f8f4b;
  background: #e8f5e9;
  color: #1e4d28;
}

.fss-stats-row--ok.fss-stats-row--meta-warn {
  border-color: #b7791f;
  background: #fff6e5;
  color: #6b4a0f;
}

.fss-stat-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(0, 0, 0, 0.08);
  font-size: 0.84rem;
  font-weight: 600;
  line-height: 1.35;
}

.fss-stat-badge--over {
  background: #c0392b;
  border-color: #a93226;
  color: #fff;
}

.fss-stat-badge--ok {
  background: #3f8f4b;
  border-color: #357a40;
  color: #fff;
}

.fss-stat-badge--meta-warn {
  background: #d68910;
  border-color: #b9770e;
  color: #fff;
}

.fss-stat-badge--meta-ok {
  background: #3f8f4b;
  border-color: #357a40;
  color: #fff;
}

.fss-stat-badge--meta {
  gap: 0.35rem;
}

.fss-over {
  color: #c0392b;
}

.fss-ok {
  color: #3f8f4b;
}

.fss-meta-warn {
  color: #b7791f;
}

.fss-meta-ok {
  color: #3f8f4b;
}

.fss-delta {
  margin: -0.25rem 0 0.55rem;
  padding: 0.4rem 0.65rem;
  border-radius: 3px;
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.35;
  font-family: "Source Sans 3", "Gill Sans", sans-serif;
  animation: fss-delta-in 220ms ease-out;
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fss-delta--saved {
  background: #d8ecd9;
  border: 1px solid #3f8f4b;
  color: #1e5a2a;
}

.fss-delta--meta {
  background: #e8f0fe;
  border: 1px solid #3b6ea5;
  color: #1a4a7a;
}

.fss-delta--neutral,
.fss-delta--grow {
  background: #f0f0f0;
  border: 1px solid #999;
  color: #444;
}

.fss-delta--fade {
  opacity: 0;
  transform: translateY(-4px);
}

@keyframes fss-delta-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fss-tutorial {
  margin-bottom: 0.7rem;
  padding: 0.65rem 0.75rem;
  border-radius: 4px;
  border: 1px solid #5d6d7e;
  background: #f4f6f7;
  font-size: 0.84rem;
  line-height: 1.45;
  font-family: "Source Sans 3", "Gill Sans", sans-serif;
}

.fss-tutorial strong {
  display: block;
  margin-bottom: 0.2rem;
  font-size: 0.92rem;
}

.fss-tutorial p {
  margin: 0 0 0.45rem;
  color: #4a5560;
}

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

.fss-tutorial-step {
  display: flex;
  align-items: flex-start;
  gap: 0.45rem;
  margin: 0.25rem 0;
  color: #37474f;
}

.fss-tutorial-step--done {
  color: #2d6a3a;
  text-decoration: line-through;
  opacity: 0.85;
}

.fss-tutorial-check {
  flex: 0 0 1.1rem;
  width: 1.1rem;
  height: 1.1rem;
  margin-top: 0.05rem;
  border: 1.5px solid #78909c;
  border-radius: 2px;
  background: #fff;
  font-size: 0.72rem;
  line-height: 1.05rem;
  text-align: center;
  color: #2d6a3a;
  font-weight: 700;
}

.fss-tutorial-step--done .fss-tutorial-check {
  border-color: #3f8f4b;
  background: #d8ecd9;
}

.s4-meta-bad {
  color: #ffb4a8;
  font-weight: 700;
}

.s4-meta-ok-line {
  color: #c8e6c9;
}

.fss-result {
  margin-bottom: 0.55rem;
  padding: 0.5rem 0.65rem;
  border-radius: 3px;
  font-size: 0.84rem;
  line-height: 1.45;
}

.fss-result--success {
  background: #d8ecd9;
  border: 1px solid #3f8f4b;
  color: #2d6a3a;
}

.fss-result--error {
  background: rgba(183, 121, 31, 0.12);
  border: 1px solid rgba(183, 121, 31, 0.35);
  color: #8a5a12;
}

.fss-result--below-treemap {
  margin-bottom: 0;
  margin-top: 0.55rem;
}

.fss-treemap {
  position: relative;
  width: 100%;
  height: min(320px, 45vh);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  background: #fff;
}

.fss-grid-group {
  overflow: visible;
  position: relative;
  z-index: 1;
}

.fss-grid-group .fss-segment--selected {
  z-index: 3;
}

.fss-segment--selected {
  z-index: 2;
  box-shadow: inset 0 0 0 3px #f1c40f;
}

.fss-treemap .fss-segment--selected {
  overflow: visible;
}

.fss-actions {
  margin-top: 0.65rem;
}

.fss-reset {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--ink);
  padding: 0.35rem 0.8rem;
  border-radius: 3px;
  cursor: pointer;
  font-family: "Source Sans 3", "Gill Sans", sans-serif;
  font-size: 0.82rem;
}

.fss-reset:hover {
  background: var(--bg);
}

/* ZIP archive simulation (Sektion 3) */
.zip-archive-widget {
  border: 1px solid var(--border);
  background: #fffdf8;
  padding: 0.8rem 1rem 1rem;
  border-radius: 3px;
  margin: 0.75rem 0;
}

.zip-sim-controls {
  text-align: center;
  margin-bottom: 14px;
}

.zip-sim-btn {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  padding: 0.45rem 1.2rem;
  border-radius: 3px;
  cursor: pointer;
  font-family: "Source Sans 3", "Gill Sans", sans-serif;
  font-size: 14px;
  font-weight: 600;
}

.zip-sim-btn--busy {
  opacity: 0.65;
  cursor: wait;
}

.zip-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.zip-columns--stacked {
  grid-template-columns: 1fr;
}

.zip-panel {
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  background: #fff;
  display: flex;
  flex-direction: column;
}

.zip-panel-head {
  padding: 10px 12px 8px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.zip-panel-title {
  font-weight: 600;
  font-family: sans-serif;
  font-size: 14px;
  margin-bottom: 2px;
}

.zip-panel-desc {
  font-size: 12px;
  color: var(--muted);
}

.zip-process {
  padding: 6px 12px;
  border-bottom: 1px solid var(--border);
  background: #faf8f5;
  min-height: 1.75rem;
  font-family: ui-monospace, "Cascadia Mono", "Segoe UI Mono", monospace;
  font-size: 12px;
}

.zip-process-label {
  color: var(--muted);
}

.zip-process-label--active {
  color: var(--accent);
  font-weight: 600;
}

.zip-panel-body {
  flex: 1;
}

.zip-panel-body--archive {
  padding: 10px 12px;
}

.zip-file-row,
.zip-inner-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 3px;
  border-bottom: 1px solid var(--border);
  font-family: monospace;
  font-size: 13px;
}

.zip-inner-row {
  padding: 2px 4px;
  border-bottom: none;
  gap: 6px;
}

.zip-file-status,
.zip-inner-status {
  width: 18px;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
  flex-shrink: 0;
}

.zip-inner-status {
  width: 14px;
  font-size: 11px;
}

.zip-file-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.zip-file-size {
  font-size: 12px;
  color: var(--muted);
  flex-shrink: 0;
  font-family: monospace;
}

.zip-file-icon,
.zip-archive-icon {
  flex-shrink: 0;
  font-size: 14px;
}

.zip-archive-icon {
  font-size: 16px;
}

.zip-row--active {
  background: rgba(28, 93, 140, 0.08);
}

.zip-row--done {
  background: rgba(63, 143, 75, 0.08);
}

.zip-status--done {
  color: #3f8f4b;
}

.zip-archive-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 10px;
  background: #f5f2f0;
  border-radius: 3px;
  border: 1px solid var(--border);
  margin-bottom: 8px;
}

.zip-archive-header-main {
  display: flex;
  align-items: center;
  gap: 8px;
}

.zip-archive-name {
  font-weight: 600;
  font-family: monospace;
  font-size: 14px;
}

.zip-archive-header--active {
  background: rgba(28, 93, 140, 0.1);
  border-color: var(--accent);
}

.zip-archive-header--done {
  background: rgba(28, 93, 140, 0.1);
  border-color: var(--accent);
}

.zip-tree {
  padding-left: 8px;
  border-left: 1px dashed var(--border);
  margin-left: 14px;
  font-family: monospace;
}

.zip-inner-branch {
  color: var(--muted);
}

.zip-inner-name {
  color: #555;
}

.zip-stats {
  padding: 10px 12px;
  background: var(--bg);
  border-top: 1px solid var(--border);
  font-size: 12px;
  line-height: 1.7;
}

.zip-stat-label {
  color: var(--muted);
}

.zip-stat-size {
  margin-top: 4px;
}

.zip-stats--highlight {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.zip-faq {
  margin-top: 14px;
}

.zip-faq-list {
  margin-top: 0.5rem;
}

.zip-faq-item {
  margin: 0.4rem 0;
}

.zip-faq-answer {
  margin: 0.4rem 0 0;
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink);
}