/* Lesson 03: shared content edges and isolated teaching demos. */
.webapp-page:has([data-css-lesson="03"]),
.student-session-container:has([data-css-lesson="03"]) {
  --css03-content-width: 1120px;
}
.student-session-container:has([data-css-lesson="03"]) {
  width: 100%;
}
.webapp-page:has([data-css-lesson="03"]) .webapp-page-header > .container,
.student-session-lesson:has([data-css-lesson="03"]) > .lesson-header,
.webapp-css-lesson .container {
  width: min(var(--css03-content-width), calc(100% - 2rem));
  max-width: none;
  margin-inline: auto;
}
.webapp-page:has([data-css-lesson="03"]) .webapp-page-header h1,
.student-session-lesson:has([data-css-lesson="03"]) > .lesson-header h1 {
  font-size: 2.5rem;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}
.webapp-css-lesson {
  min-width: 0;
}
.webapp-css-lesson .section {
  padding: 2rem 0;
  scroll-margin-top: 10rem;
}
.webapp-css-lesson .section + .section {
  border-top: 1px solid var(--webapp-line);
}
.webapp-css-lesson .container {
  display: grid;
  gap: 1rem;
}
.webapp-css-lesson h2,
.webapp-css-lesson h3,
.webapp-css-lesson h4 {
  margin: 0;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}
.webapp-css-lesson h2 { font-size: 1.65rem; }
.webapp-css-lesson h3 { font-size: 1.2rem; }
.webapp-css-lesson h4 { font-size: 1rem; }
.webapp-css-lesson p { margin: 0; }
.webapp-css-lesson .webapp-local-nav {
  position: static;
  width: 100%;
  max-width: none;
  margin: 0;
  border: 0;
  padding: 0 0 1rem;
  box-shadow: none;
  background: transparent;
}
.webapp-css-lesson .webapp-local-nav a {
  padding: 0.3rem 0;
  margin-right: 1rem;
  background: transparent;
  border-radius: 0;
  text-decoration: underline;
  text-underline-offset: 0.25rem;
}
.webapp-css-lesson .webapp-code-preview {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  align-items: start;
}
.webapp-css-lesson .webapp-code-preview > div {
  display: grid;
  gap: 0.75rem;
  min-width: 0;
}
.webapp-css-lesson .webapp-code {
  font-size: 0.92rem;
  border-radius: 6px;
  overflow-wrap: anywhere;
}
.webapp-css-lesson .css03-note {
  border-left: 3px solid var(--webapp-accent);
  background: var(--webapp-accent-soft);
  padding: 1rem;
}
.webapp-css-lesson .css03-demo {
  display: grid;
  gap: 1rem;
  min-width: 0;
  border: 1px solid var(--webapp-line);
  border-radius: 6px;
  padding: 1rem;
  background: #fff;
}
.webapp-css-lesson .css03-feedback {
  min-height: 4rem;
  padding: 0.75rem;
  border-left: 3px solid var(--webapp-accent);
  background: #f3f8fb;
  color: #17202a;
}
.webapp-css-lesson .webapp-segmented button {
  border-radius: 6px;
  background: #f3f8fb;
  color: #17202a;
  min-height: 44px;
  transition: none;
}
.webapp-css-lesson .webapp-segmented button strong {
  color: inherit;
}
.webapp-css-lesson .webapp-segmented button:hover,
.webapp-css-lesson .webapp-segmented button:focus-visible,
.webapp-css-lesson .webapp-segmented button[aria-pressed="true"] {
  background: #256f6b;
  color: #fff;
  border-color: #256f6b;
}
.webapp-css-lesson :is(button, summary, select, input, a):focus-visible {
  outline: 3px solid #173b57;
  outline-offset: 3px;
}
.webapp-css-lesson :is(select, input, button) {
  font: inherit;
}
.webapp-css-lesson select {
  width: 100%;
  min-width: 0;
  padding: 0.5rem;
  min-height: 44px;
  border: 1px solid #8295a1;
  border-radius: 6px;
  background: #fff;
  color: #17202a;
}
.webapp-css-lesson .css03-controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.webapp-css-lesson label:not(.css03-toggle) {
  display: grid;
  gap: 0.4rem;
}
.webapp-css-lesson input[type="range"] {
  width: 100%;
  min-width: 0;
  accent-color: #256f6b;
}
.webapp-css-lesson input[type="color"] {
  width: 100%;
  height: 44px;
  border: 1px solid #8295a1;
  border-radius: 6px;
  padding: 3px;
  cursor: pointer;
}
.webapp-css-lesson .css03-toggle,
.webapp-css-lesson .css03-checklist label {
  display: flex;
  gap: 0.65rem;
  align-items: baseline;
}
.webapp-css-lesson input[type="checkbox"] {
  width: 1.1rem;
  height: 1.1rem;
  flex: 0 0 auto;
  accent-color: #256f6b;
}
.webapp-css-lesson .webapp-code-preview > .css03-preview {
  display: block;
  min-height: 160px;
  background: #fff;
  color: #17202a;
  padding: 1rem;
  border: 1px solid #dfe7f3;
  border-radius: 6px;
}
.webapp-css-lesson .css03-preview :is(h1, h2, p) {
  color: inherit;
  margin: 0 0 0.8rem;
}
.webapp-css-lesson .css03-preview h1 {
  font-size: 2rem;
  letter-spacing: 0;
  line-height: 1.25;
}
.webapp-css-lesson [data-class-preview] p {
  padding: 0.5rem;
  border: 1px solid #dfe7f3;
}
.webapp-css-lesson .css03-profile-frame {
  width: 100%;
  height: 430px;
  border: 1px solid #dfe7f3;
  border-radius: 6px;
  background: #fff;
}
.webapp-css-lesson .css03-box-stage,
.webapp-css-lesson .css03-playground-stage {
  min-height: 280px;
  padding: 0.75rem;
  background: #f3f8fb;
}
.webapp-css-lesson .css03-margin-area {
  display: flow-root;
  margin-top: 0.75rem;
  border: 1px dashed #8b6914;
  background: #fef08a;
}
.webapp-css-lesson .css03-box {
  width: fit-content;
  border: 3px solid #256f6b;
  background: #b8e4db;
  color: #17202a;
}
.webapp-css-lesson .css03-box span {
  display: block;
  padding: 0.25rem;
  background: #fff;
}
.webapp-css-lesson .css03-playground-box {
  width: 100%;
  border: 2px solid #173b57;
  overflow-wrap: anywhere;
  line-height: 1.5;
}
.webapp-css-lesson .css03-debug,
.webapp-css-lesson .css03-debug article,
.webapp-css-lesson .css03-checklist {
  display: grid;
  gap: 1rem;
}
.webapp-css-lesson .css03-debug article + article {
  border-top: 1px solid var(--webapp-line);
  padding-top: 1.5rem;
}
.webapp-css-lesson summary {
  width: fit-content;
  padding: 0.65rem;
  color: #173b57;
  cursor: pointer;
  font-weight: 700;
  border: 1px solid #8295a1;
  border-radius: 6px;
}
.webapp-css-lesson summary:hover,
.webapp-css-lesson details[open] summary {
  color: #fff;
  background: #256f6b;
}
.webapp-css-lesson details > :not(summary) {
  margin-top: 0.75rem;
}
.webapp-css-lesson .css03-reference {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  margin: 0;
}
.webapp-css-lesson .css03-reference :is(dt, dd) {
  margin: 0;
  padding: 1rem 0;
  border-bottom: 1px solid var(--webapp-line);
  overflow-wrap: anywhere;
}
@media (max-width: 720px) {
  .webapp-css-lesson .webapp-code-preview,
  .webapp-css-lesson .css03-controls,
  .webapp-css-lesson .css03-reference {
    grid-template-columns: minmax(0, 1fr);
  }
  .webapp-page:has([data-css-lesson="03"]) .webapp-page-header h1,
  .student-session-lesson:has([data-css-lesson="03"]) > .lesson-header h1 {
    font-size: 2rem;
  }
  .webapp-css-lesson .css03-demo {
    padding: 0.75rem;
  }
}

.webapp-page,
.student-session-lesson {
  --webapp-ink: #17202a;
  --webapp-muted: #5f6f82;
  --webapp-line: #dfe7f3;
  --webapp-surface: #ffffff;
  --webapp-soft: #f3f8fb;
  --webapp-accent: #256f6b;
  --webapp-accent-soft: #e7f4f2;
  --webapp-code: #15202b;
  --webapp-code-text: #eef6ff;
}

.webapp-hero {
  padding-top: 3.2rem;
}

.webapp-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
  gap: 2rem;
  align-items: center;
}

.webapp-page-header .lead,
.webapp-hero .lead {
  max-width: 780px;
}

.webapp-subnav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.4rem;
}

.webapp-subnav a {
  border: 1px solid var(--webapp-line);
  border-radius: 999px;
  background: var(--webapp-surface);
  color: var(--webapp-muted);
  font-weight: 800;
  padding: 0.7rem 1rem;
}

.webapp-subnav a:hover,
.webapp-subnav a:focus-visible,
.webapp-subnav a.is-active {
  border-color: var(--webapp-accent);
  background: var(--webapp-accent-soft);
  color: var(--webapp-accent);
}

.webapp-local-nav {
  position: sticky;
  top: 0.75rem;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  max-width: 760px;
  margin-top: 1.2rem;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.94);
  padding: 0.65rem;
  box-shadow: var(--shadow);
}

.webapp-local-nav a {
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--webapp-soft);
  color: var(--webapp-muted);
  font-size: 0.88rem;
  font-weight: 850;
  padding: 0.45rem 0.7rem;
}

.webapp-local-nav a:hover,
.webapp-local-nav a:focus-visible {
  border-color: var(--webapp-accent);
  background: var(--webapp-accent-soft);
  color: var(--webapp-accent);
}

.webapp-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
  margin-bottom: 1rem;
  color: var(--webapp-muted);
  font-size: 0.92rem;
  font-weight: 800;
}

.webapp-breadcrumb a {
  color: var(--webapp-accent);
}

.webapp-breadcrumb a::after {
  content: "/";
  margin-left: 0.4rem;
  color: var(--webapp-muted);
}

.webapp-browser {
  overflow: hidden;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-code);
  box-shadow: var(--shadow);
}

.webapp-browser-bar {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  padding: 0.8rem 1rem;
}

.webapp-browser-bar span {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 999px;
  background: #ef6b6b;
}

.webapp-browser-bar span:nth-child(2) {
  background: #e0b84d;
}

.webapp-browser-bar span:nth-child(3) {
  background: #58b878;
}

.webapp-browser pre,
.webapp-code {
  max-width: 100%;
  margin: 0;
  overflow-x: auto;
  white-space: pre-wrap;
  background: var(--webapp-code);
  color: var(--webapp-code-text);
  font-family: Consolas, "Courier New", monospace;
  line-height: 1.5;
  padding: 1.2rem;
}

.webapp-section-grid,
.webapp-library-grid,
.webapp-track-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.webapp-section-card,
.webapp-library-card,
.webapp-track-card,
.webapp-filter-panel,
.webapp-reference-main,
.webapp-reference-side {
  min-width: 0;
  box-sizing: border-box;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-surface);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.webapp-section-card {
  display: grid;
  gap: 0.9rem;
  align-content: start;
}

.webapp-lesson-list {
  display: grid;
  gap: 0.9rem;
}

.webapp-lesson-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-surface);
  box-shadow: var(--shadow);
  padding: 1.1rem;
}

.webapp-lesson-card h2,
.webapp-lesson-card p {
  margin: 0;
}

.webapp-lesson-card p {
  color: var(--webapp-muted);
}

.webapp-action-row {
  margin: 1rem 0 0;
}

.webapp-section-card h2,
.webapp-library-card h2,
.webapp-track-card h2,
.webapp-filter-panel h2,
.webapp-reference-main h2,
.webapp-reference-side h2 {
  margin: 0;
  font-size: 1.25rem;
}

.webapp-section-card p,
.webapp-library-card p,
.webapp-track-card p {
  margin: 0;
  color: var(--webapp-muted);
}

.webapp-card-index,
.webapp-card-header span {
  width: fit-content;
  border-radius: 999px;
  background: var(--webapp-accent-soft);
  color: var(--webapp-accent);
  font-size: 0.78rem;
  font-weight: 900;
  padding: 0.25rem 0.55rem;
}

.webapp-card-header {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  justify-content: space-between;
}

.webapp-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0.9rem 0 0;
  padding: 0;
  list-style: none;
}

.webapp-chip-list li {
  border: 1px solid var(--webapp-line);
  border-radius: 999px;
  background: var(--webapp-soft);
  color: var(--webapp-muted);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.35rem 0.65rem;
}

.webapp-library-tools {
  display: grid;
  grid-template-columns: auto minmax(220px, 1fr) minmax(180px, 260px);
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 1rem;
}

.webapp-library-tools label {
  color: var(--webapp-muted);
  font-weight: 800;
}

.webapp-library-tools input,
.webapp-library-tools select {
  min-height: 44px;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-surface);
  color: var(--webapp-muted);
  padding: 0.65rem 0.8rem;
}

.webapp-library-detail,
.webapp-code-preview {
  display: grid;
  grid-template-columns: minmax(220px, 0.34fr) minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}

.webapp-reference-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
  gap: 1rem;
  align-items: start;
}

.webapp-reference-layout-full {
  grid-template-columns: minmax(0, 1fr);
}

.webapp-code-preview {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.webapp-reference-list,
.webapp-reference-main {
  display: grid;
  gap: 1rem;
}

.webapp-reference-side {
  position: sticky;
  top: 1rem;
}

.webapp-reference-section {
  min-width: 0;
  display: grid;
  gap: 1rem;
}

.webapp-reference-layout .webapp-code,
.webapp-reference-layout .webapp-file-tree {
  white-space: pre;
}

.webapp-reference-main > *,
.webapp-reference-side > *,
.webapp-reference-section > *,
.webapp-code-preview > *,
.webapp-example-stack > *,
.webapp-attribute-list > *,
.webapp-demo-fields > * {
  min-width: 0;
}

.webapp-reference-section p,
.webapp-reference-section li,
.webapp-reference-section a,
.webapp-mistake p,
.webapp-mistake li,
.webapp-mistake a {
  overflow-wrap: anywhere;
}

.webapp-reference-section h3,
.webapp-mistake h3 {
  margin: 0;
  font-size: 1rem;
}

.webapp-text-stack,
.webapp-example-stack,
.webapp-attribute-list,
.webapp-mistake-list,
.webapp-try,
.webapp-demo-fields {
  display: grid;
  gap: 0.85rem;
}

.webapp-text-stack p,
.webapp-reference-section p,
.webapp-mistake p {
  margin: 0;
}

.webapp-reference-list-plain {
  margin: 0;
  padding-left: 1.2rem;
}

.webapp-attribute-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.webapp-attribute-card,
.webapp-example-card {
  min-width: 0;
  display: grid;
  gap: 0.7rem;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-soft);
  padding: 1rem;
}

.webapp-reference-card {
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-surface);
  padding: 1rem;
}

.webapp-reference-card h2 {
  margin: 0 0 0.4rem;
  font-size: 1.1rem;
}

.webapp-reference-card p {
  margin: 0;
  color: var(--webapp-muted);
}

.webapp-reference-count {
  font-weight: 900;
}

.webapp-preview-frame {
  max-width: 100%;
  width: 100%;
  min-height: 260px;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-surface);
}

.webapp-file-tree {
  max-width: 100%;
  margin: 0;
  overflow-x: auto;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--webapp-muted);
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.92rem;
  line-height: 1.5;
  padding: 0.85rem;
  white-space: pre-wrap;
}

.webapp-live-preview {
  max-width: 100%;
  box-sizing: border-box;
  min-height: 118px;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-surface);
  padding: 1.2rem;
}

.webapp-live-preview img,
.webapp-preview-frame img {
  max-width: 100%;
  height: auto;
}

.webapp-anatomy {
  min-width: 0;
  display: grid;
  gap: 0.7rem;
}

.webapp-anatomy-parts,
.webapp-anatomy-labels {
  display: grid;
  grid-template-columns: minmax(72px, auto) minmax(0, 1fr) minmax(72px, auto);
  gap: 0.5rem;
  align-items: center;
}

.webapp-anatomy-parts span,
.webapp-anatomy-labels span {
  border-radius: 8px;
  padding: 0.55rem 0.65rem;
  text-align: center;
}

.webapp-anatomy-parts span {
  border: 1px solid var(--webapp-line);
  background: var(--webapp-soft);
  font-family: Consolas, "Courier New", monospace;
  font-weight: 800;
}

.webapp-anatomy-labels span {
  color: var(--webapp-muted);
  font-size: 0.85rem;
  font-weight: 800;
}

.webapp-anatomy-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}

.webapp-anatomy-grid div {
  min-width: 0;
  display: grid;
  gap: 0.35rem;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-soft);
  padding: 0.75rem;
}

.webapp-anatomy-grid span {
  color: var(--webapp-muted);
  font-size: 0.82rem;
  font-weight: 900;
  text-transform: uppercase;
}

.webapp-anatomy-grid code {
  overflow-wrap: anywhere;
  color: var(--webapp-ink);
  font-family: Consolas, "Courier New", monospace;
  font-weight: 800;
}

.webapp-anatomy-comparison {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.webapp-anatomy-comparison article {
  min-width: 0;
  display: grid;
  gap: 0.65rem;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-soft);
  padding: 0.9rem;
}

.webapp-mistake {
  min-width: 0;
  display: grid;
  gap: 0.7rem;
  border: 1px solid var(--webapp-line);
  border-left: 4px solid #b42318;
  border-radius: 8px;
  background: #fffafa;
  padding: 1rem;
}

.webapp-bad-label {
  color: #b42318;
  font-weight: 900;
}

.webapp-try label,
.webapp-demo-fields label {
  display: grid;
  gap: 0.4rem;
  color: var(--webapp-ink);
  font-weight: 900;
}

.webapp-try input,
.webapp-demo-fields input,
.webapp-demo-fields select {
  box-sizing: border-box;
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-surface);
  color: var(--webapp-ink);
  font: inherit;
  padding: 0.7rem 0.8rem;
}

.webapp-try input[type="range"],
.webapp-demo-fields input[type="range"] {
  min-height: 34px;
  padding: 0;
  accent-color: var(--webapp-accent);
}

.webapp-try input:focus,
.webapp-demo-fields input:focus,
.webapp-demo-fields select:focus {
  border-color: var(--webapp-accent);
  box-shadow: 0 0 0 4px rgba(37, 111, 107, 0.14);
  outline: none;
}

.webapp-demo-field-value {
  color: var(--webapp-muted);
  font-size: 0.9rem;
  font-weight: 800;
}

.webapp-empty-state {
  margin: 1rem 0 0;
  border: 1px dashed var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-soft);
  color: var(--webapp-muted);
  font-weight: 800;
  padding: 1rem;
}

.webapp-lesson-hero {
  padding-top: 2rem;
}

.webapp-lesson-hero-grid,
.webapp-two-column {
  display: grid;
  gap: 1.2rem;
  align-items: start;
}

.webapp-lesson-hero-grid,
.webapp-two-column {
  grid-template-columns: minmax(0, 1fr);
}

.webapp-lesson-hero-grid {
  max-width: 980px;
}

.webapp-two-column > *,
.webapp-lesson-hero-grid > * {
  min-width: 0;
}

.webapp-lesson-hero h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  line-height: 1.1;
}

.webapp-browser-mockup {
  background: var(--webapp-surface);
}

.webapp-browser-address {
  margin: 1rem;
  border-radius: 8px;
  background: var(--webapp-soft);
  color: var(--webapp-muted);
  font-family: Consolas, "Courier New", monospace;
  font-weight: 800;
  padding: 0.75rem 0.9rem;
}

.webapp-browser-page {
  margin: 1rem;
  min-height: 170px;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: linear-gradient(180deg, #d9eef2 0%, #ffffff 82%);
  padding: 1.2rem;
}

.webapp-browser-page h3,
.webapp-browser-page p {
  margin: 0 0 0.6rem;
}

.webapp-flow-strip,
.webapp-browser-steps {
  margin: 0;
  padding: 0;
  list-style: none;
}

.webapp-flow-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.2rem;
}

.webapp-flow-strip li {
  position: relative;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-surface);
  color: var(--webapp-muted);
  font-weight: 900;
  padding: 0.7rem 0.85rem;
}

.webapp-flow-strip li:not(:last-child)::after {
  content: "→";
  margin-left: 0.55rem;
  color: var(--webapp-accent);
}

.webapp-lesson-panel {
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-surface);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.webapp-lesson-panel h2 {
  margin: 0;
}

.webapp-mini-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.webapp-mini-grid div {
  display: grid;
  gap: 0.3rem;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-soft);
  padding: 0.85rem;
}

.webapp-mini-grid strong {
  color: var(--webapp-accent);
}

.webapp-mini-grid span {
  color: var(--webapp-muted);
}

.webapp-emphasis-panel {
  border-color: #f2c94c;
  background: #fffdf3;
}

.webapp-rendered-page {
  display: grid;
  align-content: center;
}

.webapp-rendered-page h1 {
  margin: 0;
  font-size: 2rem;
}

.webapp-layer-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.webapp-layer-controls label {
  display: inline-flex;
  gap: 0.45rem;
  align-items: center;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-soft);
  font-weight: 900;
  padding: 0.65rem 0.8rem;
}

.webapp-browser-steps {
  display: grid;
  gap: 0.55rem;
  counter-reset: webapp-list;
}

.webapp-browser-steps li {
  counter-increment: webapp-list;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-soft);
  padding: 0.7rem 0.8rem;
}

.webapp-browser-steps li::before {
  content: counter(webapp-list) ". ";
  color: var(--webapp-accent);
  font-weight: 900;
}

.webapp-diagnostic-result {
  min-height: 64px;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: #fffdf3;
  font-weight: 800;
  padding: 0.85rem;
}

.webapp-summary-flow .webapp-flow-strip {
  margin-top: 0;
}

.webapp-document-anatomy {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.72fr);
  gap: 1rem;
  align-items: start;
}

.webapp-code-lines button {
  display: block;
  width: 100%;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font: inherit;
  line-height: 1.5;
  padding: 0.05rem 0.25rem;
  text-align: left;
  white-space: pre-wrap;
}

.webapp-code-lines button:hover,
.webapp-code-lines button:focus-visible,
.webapp-code-lines button.is-active {
  background: rgba(242, 201, 76, 0.22);
  outline: none;
}

.webapp-anatomy-detail {
  display: grid;
  gap: 0.8rem;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-soft);
  padding: 1rem;
}

.webapp-anatomy-detail h3,
.webapp-anatomy-detail p {
  margin: 0;
}

.webapp-head-body-preview {
  display: grid;
  gap: 0.65rem;
}

.webapp-tab-preview,
.webapp-window-preview {
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: #ffffff;
  padding: 0.85rem;
}

.webapp-tab-preview {
  color: var(--webapp-muted);
  font-weight: 900;
}

.webapp-window-preview {
  min-height: 128px;
}

.webapp-window-preview h4,
.webapp-window-preview p {
  margin: 0 0 0.55rem;
}

.webapp-tab-preview.is-active,
.webapp-window-preview.is-active {
  border-color: #f2c94c;
  box-shadow: 0 0 0 4px rgba(242, 201, 76, 0.22);
}

.webapp-workflow-cycle {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.65rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.webapp-workflow-cycle li {
  display: grid;
  min-height: 86px;
  align-items: center;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-soft);
  color: var(--webapp-accent);
  font-weight: 900;
  padding: 0.75rem;
  text-align: center;
}

.webapp-task-panel {
  border-color: var(--webapp-accent);
  background: #f3faf7;
}

.webapp-profile-preview {
  display: grid;
  gap: 0.7rem;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: #ffffff;
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.webapp-profile-preview h3,
.webapp-profile-preview h4,
.webapp-profile-preview p,
.webapp-profile-preview ul {
  margin: 0;
}

.webapp-profile-role {
  color: var(--webapp-muted);
  font-weight: 900;
}

.webapp-profile-image-placeholder,
.webapp-radius-sample {
  display: grid;
  width: 112px;
  aspect-ratio: 1;
  place-items: center;
  border: 2px solid #7db8a4;
  border-radius: 24px;
  background: #d9eef2;
  color: #123c3a;
  font-size: 2rem;
  font-weight: 900;
}

.webapp-div-demo {
  border: 2px dashed var(--webapp-accent);
  border-radius: 8px;
  background: var(--webapp-accent-soft);
  padding: 1rem;
}

.webapp-div-demo h3,
.webapp-div-demo p {
  margin: 0 0 0.45rem;
}

.webapp-css-load-flow {
  display: grid;
  grid-template-columns: minmax(120px, 1fr) minmax(180px, 1.4fr) minmax(120px, 1fr);
  gap: 0.75rem;
  align-items: center;
}

.webapp-css-load-flow div {
  min-width: 0;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-soft);
  color: var(--webapp-ink);
  font-family: Consolas, "Courier New", monospace;
  font-weight: 800;
  overflow-wrap: anywhere;
  padding: 0.9rem;
  text-align: center;
}

.webapp-css-load-flow div:not(:last-child)::after {
  content: "→";
  margin-left: 0.6rem;
  color: var(--webapp-accent);
}

.webapp-tool-reference,
.webapp-css-reference-grid,
.webapp-checklist-grid,
.webapp-checklist-columns,
.webapp-level-grid,
.webapp-css-rule-parts {
  display: grid;
  gap: 0.75rem;
}

.webapp-tool-reference {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.webapp-tool-reference div,
.webapp-css-reference-grid div,
.webapp-css-rule-parts div,
.webapp-level-grid section,
.webapp-checklist-columns section {
  display: grid;
  gap: 0.45rem;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-soft);
  padding: 0.9rem;
}

.webapp-css-rule-parts button {
  display: grid;
  gap: 0.35rem;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-soft);
  color: var(--webapp-ink);
  cursor: pointer;
  font: inherit;
  padding: 0.9rem;
  text-align: left;
}

.webapp-css-rule-parts button:hover,
.webapp-css-rule-parts button:focus-visible,
.webapp-css-rule-parts button.is-active {
  border-color: var(--webapp-accent);
  background: var(--webapp-accent);
  color: #ffffff;
}

.webapp-css-rule-parts button span {
  font-size: 0.82rem;
  font-weight: 800;
}

.webapp-tool-reference strong,
.webapp-css-reference-grid code,
.webapp-css-rule-parts strong {
  color: var(--webapp-accent);
}

.webapp-tool-reference code,
.webapp-css-reference-grid code {
  overflow-wrap: anywhere;
  font-family: Consolas, "Courier New", monospace;
  font-weight: 900;
}

.webapp-heading-hierarchy {
  display: grid;
  gap: 0.55rem;
  border-left: 4px solid var(--webapp-accent);
  padding-left: 1rem;
}

.webapp-heading-hierarchy div {
  font-weight: 900;
}

.webapp-heading-hierarchy .is-h1 {
  font-size: 1.8rem;
}

.webapp-heading-hierarchy .is-h2 {
  margin-left: 1.1rem;
  color: var(--webapp-accent);
  font-size: 1.25rem;
}

.webapp-heading-hierarchy .is-h3 {
  margin-left: 2.2rem;
  color: var(--webapp-muted);
  font-size: 1.05rem;
}

.webapp-checklist-grid {
  grid-template-columns: minmax(0, 1fr);
}

.webapp-checklist-columns {
  grid-template-columns: minmax(0, 1fr);
}

.webapp-checklist-grid label,
.webapp-checklist-columns label {
  display: flex;
  gap: 0.55rem;
  align-items: flex-start;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: #ffffff;
  font-weight: 800;
  padding: 0.75rem;
}

.webapp-profile-compare {
  border: 1px dashed var(--webapp-line);
  border-radius: 8px;
  background: #ffffff;
  padding: 1rem;
}

.webapp-profile-compare.is-css-on .webapp-profile-preview {
  max-width: 360px;
  margin: 0 auto;
  border: 0;
  border-radius: 18px;
  background: #ffffff;
  box-shadow: 0 16px 42px rgba(23, 32, 42, 0.14);
  text-align: center;
}

.webapp-profile-compare.is-css-on .webapp-profile-image-placeholder {
  margin: 0 auto;
  border-radius: 50%;
}

.webapp-profile-compare.is-css-on a {
  width: fit-content;
  margin: 0 auto;
  border-radius: 8px;
  background: var(--webapp-accent);
  color: #ffffff;
  font-weight: 900;
  padding: 0.55rem 0.8rem;
}

.webapp-css-before-after {
  display: grid;
  gap: 0.7rem;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: #ffffff;
  padding: 1rem;
}

.webapp-css-before-after h3,
.webapp-css-before-after p {
  margin: 0;
}

.webapp-css-before-after.is-css-on {
  border: 0;
  background: #e7f4f2;
  color: #123c3a;
  box-shadow: 0 14px 36px rgba(23, 32, 42, 0.14);
}

.webapp-css-before-after.is-css-on h3 {
  font-size: 2rem;
}

.webapp-css-before-after.is-css-on a {
  width: fit-content;
  border-radius: 8px;
  background: var(--webapp-accent);
  color: #ffffff;
  font-weight: 900;
  padding: 0.55rem 0.8rem;
}

.webapp-css-comparison > div {
  min-width: 0;
}

.webapp-demo-label {
  margin: 0 0 0.5rem;
  color: var(--webapp-muted);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.webapp-switch-row {
  display: inline-flex;
  width: fit-content;
  gap: 0.6rem;
  align-items: center;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-soft);
  padding: 0.7rem 0.85rem;
}

.webapp-switch-row input {
  width: 1.15rem;
  height: 1.15rem;
  accent-color: var(--webapp-accent);
}

.webapp-segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.webapp-segmented button {
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-soft);
  color: var(--webapp-ink);
  cursor: pointer;
  font: inherit;
  font-weight: 900;
  padding: 0.6rem 0.75rem;
}

.webapp-segmented button.is-active,
.webapp-segmented button:hover,
.webapp-segmented button:focus-visible {
  border-color: var(--webapp-accent);
  background: var(--webapp-accent);
  color: #ffffff;
}

.webapp-css-methods,
.webapp-css-lab {
  display: grid;
  gap: 0.8rem;
}

.webapp-css-controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.webapp-css-lab label {
  display: grid;
  gap: 0.35rem;
  color: var(--webapp-ink);
  font-weight: 900;
}

.webapp-css-lab input,
.webapp-css-lab select,
.webapp-demo-fields select {
  min-height: 42px;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--webapp-ink);
  font: inherit;
  padding: 0.55rem 0.7rem;
}

.webapp-css-lab input[type="range"] {
  min-height: 34px;
  padding: 0;
  accent-color: var(--webapp-accent);
}

.webapp-lab-preview {
  min-height: 92px;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: #ffffff;
  padding: 1rem;
}

.webapp-alt-preview,
.webapp-css-taste-preview {
  min-height: 150px;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: #ffffff;
  padding: 1rem;
}

.webapp-alt-preview {
  display: grid;
  align-items: center;
  justify-items: start;
}

.webapp-alt-preview img {
  max-width: min(100%, 360px);
  height: auto;
}

.webapp-alt-preview p {
  margin: 0;
  border: 1px dashed var(--webapp-accent);
  border-radius: 8px;
  background: var(--webapp-accent-soft);
  color: var(--webapp-accent);
  font-weight: 900;
  padding: 0.9rem;
}

.webapp-css-taste-preview {
  display: grid;
  align-content: center;
  gap: 0.7rem;
}

.webapp-css-taste-preview h1,
.webapp-css-taste-preview p {
  margin: 0;
}

.webapp-selector-stage {
  display: grid;
  gap: 0.6rem;
  margin: 0.8rem 0;
}

.webapp-selector-stage > * {
  margin: 0;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-soft);
  padding: 0.75rem;
}

.webapp-selector-stage .is-selected {
  outline: 3px solid var(--webapp-accent);
  background: #ecf7f4;
}

.webapp-size-stage {
  max-width: 100%;
  overflow: auto;
  border: 1px dashed var(--webapp-line);
  border-radius: 8px;
  background: #ffffff;
  padding: 0.8rem;
}

.webapp-fixed-width,
.webapp-max-width {
  margin: 0.5rem 0;
  background: #e7f4f2;
  color: #123c3a;
  font-weight: 900;
  padding: 0.75rem;
}

.webapp-fixed-width {
  width: 500px;
}

.webapp-max-width {
  max-width: 500px;
}

.webapp-box-model-stage {
  border: 1px dashed var(--webapp-line);
  border-radius: 8px;
  background: #fffdf3;
}

.webapp-box-model-box {
  border: 3px solid var(--webapp-accent);
  background: #e7f4f2;
  color: #123c3a;
  font-weight: 900;
  text-align: center;
}

.webapp-box-model-visual {
  max-width: 520px;
  color: var(--webapp-ink);
  font-size: 0.78rem;
  font-weight: 900;
  text-align: center;
}

.webapp-box-model-visual .is-margin {
  border: 2px dashed #c17a19;
  background: #fff4db;
  padding: 1rem;
}

.webapp-box-model-visual .is-border {
  border: 4px solid var(--webapp-accent);
  background: #ffffff;
  padding: 0.6rem;
}

.webapp-box-model-visual .is-padding {
  background: #d9eef2;
  padding: 1.25rem;
}

.webapp-box-model-visual .is-content {
  background: #ffffff;
  padding: 1rem;
}

.webapp-profile-build-preview {
  max-width: 700px;
  margin: 0 auto;
  padding: 24px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  background: #f4f4f4;
  color: #222222;
  font-family: Arial, sans-serif;
}

.webapp-profile-build-preview h3 {
  color: #1d4ed8;
  font-size: 2rem;
}

.webapp-profile-build-preview h4 {
  margin-bottom: 0.35rem;
  font-size: 1.2rem;
}

.webapp-profile-build-preview .intro {
  font-size: 1.2rem;
  font-weight: 700;
}

.webapp-profile-build-preview a {
  color: #1d4ed8;
  font-weight: 700;
  text-decoration: underline;
}

.webapp-style-playground {
  display: grid;
  grid-template-columns: minmax(220px, 0.65fr) minmax(0, 1.35fr);
  gap: 1rem;
  align-items: start;
}

.webapp-playground-preview {
  min-height: 150px;
  display: grid;
  align-content: center;
  border: 1px solid var(--webapp-line);
  font-weight: 800;
}

.webapp-project-brief {
  border-top: 5px solid var(--webapp-accent);
}

.webapp-css-reference-grid-wide {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.webapp-css-reference-grid-wide div {
  align-content: start;
}

.webapp-css-reference-grid-wide strong {
  margin-bottom: 0.25rem;
}

.webapp-hover-demo {
  display: inline-block;
  width: fit-content;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  color: blue;
  font-weight: 900;
  padding: 0.7rem 0.9rem;
}

.webapp-hover-demo:hover,
.webapp-hover-demo:focus-visible {
  border-color: red;
  color: red;
}

.webapp-reference-link-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.webapp-reference-link-list a {
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--webapp-accent);
  font-weight: 900;
  padding: 0.45rem 0.6rem;
}

.webapp-css-reference-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.webapp-css-rule-parts {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.webapp-radius-demo {
  display: grid;
  gap: 1rem;
}

.webapp-radius-demo label {
  display: grid;
  gap: 0.45rem;
  font-weight: 900;
}

.webapp-radius-demo input[type="range"] {
  accent-color: var(--webapp-accent);
}

.webapp-radius-sample {
  width: 160px;
  transition: border-radius 160ms ease;
}

.webapp-radius-variants {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.webapp-radius-variants div {
  display: grid;
  gap: 0.45rem;
  justify-items: center;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-soft);
  padding: 0.75rem;
}

.webapp-radius-variants span {
  display: block;
  width: 74px;
  aspect-ratio: 1;
  background: var(--webapp-accent);
}

.webapp-radius-variants .radius-zero {
  border-radius: 0;
}

.webapp-radius-variants .radius-soft {
  border-radius: 20px;
}

.webapp-radius-variants .radius-circle {
  border-radius: 50%;
}

.webapp-cheatsheet-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.webapp-cheatsheet-grid section {
  min-width: 0;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-soft);
  padding: 1rem;
}

.webapp-cheatsheet-grid h3,
.webapp-cheatsheet-grid dl {
  margin: 0;
}

.webapp-cheatsheet-grid dl {
  display: grid;
  gap: 0.65rem;
}

.webapp-cheatsheet-grid dl div {
  min-width: 0;
  display: grid;
  gap: 0.2rem;
  border-top: 1px solid var(--webapp-line);
  padding-top: 0.65rem;
}

.webapp-cheatsheet-grid dt,
.webapp-cheatsheet-grid dd {
  min-width: 0;
  margin: 0;
}

.webapp-cheatsheet-grid code {
  overflow-wrap: anywhere;
}

.webapp-level-grid {
  grid-template-columns: minmax(0, 1fr);
}

.webapp-level-grid h3,
.webapp-level-grid p,
.webapp-level-grid ul,
.webapp-level-grid ol {
  margin: 0;
}

.webapp-debug-list {
  display: grid;
  gap: 0.65rem;
}

.webapp-debug-list button {
  display: grid;
  gap: 0.35rem;
  border: 1px solid var(--webapp-line);
  border-radius: 8px;
  background: var(--webapp-soft);
  color: var(--webapp-ink);
  cursor: pointer;
  font: inherit;
  font-weight: 900;
  padding: 0.75rem;
  text-align: left;
}

.webapp-debug-list button.is-active,
.webapp-debug-list button:hover,
.webapp-debug-list button:focus-visible {
  border-color: var(--webapp-accent);
  background: var(--webapp-accent);
  color: #ffffff;
}

.webapp-debug-list code {
  font-family: Consolas, "Courier New", monospace;
}

@media (max-width: 900px) {
  .webapp-hero-grid,
  .webapp-library-detail,
  .webapp-reference-layout,
  .webapp-code-preview,
  .webapp-lesson-hero-grid,
  .webapp-two-column,
  .webapp-document-anatomy,
  .webapp-css-load-flow,
  .webapp-cheatsheet-grid {
    grid-template-columns: 1fr;
  }

  .webapp-section-grid,
  .webapp-library-grid,
  .webapp-track-grid,
  .webapp-attribute-list,
  .webapp-anatomy-grid,
  .webapp-anatomy-comparison,
  .webapp-mini-grid,
  .webapp-tool-reference,
  .webapp-css-reference-grid,
  .webapp-css-rule-parts,
  .webapp-checklist-grid,
  .webapp-checklist-columns,
  .webapp-css-controls,
  .webapp-level-grid,
  .webapp-style-playground,
  .webapp-css-reference-grid-wide {
    grid-template-columns: 1fr;
  }

  .webapp-library-tools {
    grid-template-columns: 1fr;
  }

  .webapp-workflow-cycle {
    grid-template-columns: 1fr;
  }

  .webapp-reference-side {
    position: static;
  }
}

/* Webová dílna promo on the subject home page (workshop.html). */
.webapp-workshop-promo-section {
  padding-bottom: 0;
}

.webapp-workshop-promo {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  align-items: center;
  justify-content: space-between;
  padding: 1.3rem 1.5rem;
  border: 1px solid var(--webapp-line);
  border-left: 6px solid var(--webapp-accent);
  border-radius: 10px;
  background: linear-gradient(120deg, var(--webapp-accent-soft), var(--webapp-surface) 70%);
  box-shadow: var(--shadow);
}

.webapp-workshop-promo > div {
  flex: 1 1 22rem;
}

.webapp-workshop-promo h2 {
  margin: 0.35rem 0 0.4rem;
}

.webapp-workshop-promo p {
  margin: 0;
  color: var(--webapp-muted);
}

.webapp-workshop-badge {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  background: var(--webapp-accent);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 800;
}