/*
Theme Name: Webhostingtipps Guide
Theme URI: https://webhostingtipps.de/
Author: iSearch GmbH
Description: Ein heller Wissensguide mit Lernwegen und redaktionellen Produktvorstellungen.
Version: 1.0.0
Text Domain: wht-guide
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
*/

@font-face {
  font-family: "Source Sans 3";
  font-style: normal;
  font-weight: 200 900;
  font-display: swap;
  src: url("assets/fonts/source-sans-3-variable.ttf") format("truetype");
}

@font-face {
  font-family: "Source Sans 3";
  font-style: italic;
  font-weight: 200 900;
  font-display: swap;
  src: url("assets/fonts/source-sans-3-italic-variable.ttf") format("truetype");
}

@font-face {
  font-family: "Newsreader";
  font-style: normal;
  font-weight: 200 800;
  font-display: swap;
  src: url("assets/fonts/newsreader-variable.ttf") format("truetype");
}

:root {
  color-scheme: light;
  --canvas: #fbfcff;
  --surface: #ffffff;
  --ink: #172a46;
  --muted: #52647a;
  --action: #2f5bcd;
  --action-hover: #2147ab;
  --line: #dce4ef;
  --note: #f3d75b;
  --blue-soft: #eef3fd;
  --gutter: clamp(20px, 4.5vw, 64px);
  --measure: 68ch;
  --radius-image: 16px;
  --radius-panel: 12px;
  --radius-control: 8px;
}

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

html {
  scroll-padding-block-start: 24px;
  scrollbar-color: #8397b5 var(--canvas);
  scrollbar-width: auto;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: "Source Sans 3", sans-serif;
  font-size: 20px;
  font-weight: 400;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--note);
  color: var(--ink);
}

input,
textarea,
select {
  caret-color: var(--action);
}

img,
svg {
  max-width: 100%;
  vertical-align: middle;
}

img {
  display: block;
  height: auto;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
input[type="checkbox"],
input[type="radio"],
summary {
  cursor: pointer;
}

a {
  color: var(--action);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  overflow-wrap: anywhere;
}

a:hover {
  color: var(--action-hover);
  text-decoration-thickness: 2px;
}

:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 3px solid var(--action);
  outline-offset: 4px;
  border-radius: 3px;
}

button:disabled,
.button:disabled {
  cursor: not-allowed;
  background: #e0e7f2;
  border-color: #e0e7f2;
  color: #536179;
}

h1,
h2,
h3,
h4,
p,
figure {
  margin: 0;
}

h1,
h2,
h3,
h4 {
  overflow-wrap: anywhere;
  text-wrap: balance;
  line-height: 1.18;
}

h1 {
  font-family: "Newsreader", serif;
  font-weight: 500;
  font-optical-sizing: auto;
  font-size: clamp(2.75rem, 5.1vw, 4.5rem);
  line-height: 1.07;
  letter-spacing: -0.025em;
}

h2 {
  font-size: clamp(1.9rem, 3vw, 2.55rem);
  font-weight: 650;
  letter-spacing: -0.016em;
}

h3 {
  font-size: 1.55rem;
  font-weight: 650;
  letter-spacing: -0.012em;
}

strong {
  font-weight: 650;
}

:target {
  scroll-margin-block-start: 28px;
}

.wrap {
  width: min(1200px, calc(100% - var(--gutter) * 2));
  margin-inline: auto;
}

.screen-reader-text,
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 100;
  inset: 12px auto auto 12px;
  padding: 12px 18px;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--ink);
  border-radius: var(--radius-control);
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: none;
}

.site-header {
  background: var(--surface);
  border-block-end: 1px solid var(--line);
}

.site-header > .wrap,
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 96px;
  padding-block: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  font-size: 1.23rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.022em;
  text-decoration: none;
  flex-shrink: 0;
}

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

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 36px;
  color: var(--action);
  flex-shrink: 0;
}

.brand-mark svg {
  width: 32px;
  height: 36px;
}

.main-nav,
.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 17px;
  line-height: 1.35;
}

.main-nav a {
  color: var(--ink);
  text-decoration: none;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--action);
  text-decoration: underline;
  text-underline-offset: 6px;
}

.main-nav ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px 26px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-disclosure > summary {
  display: none;
}

.nav-disclosure:not([open]) > .nav-links {
  display: flex;
}

.search-form {
  display: flex;
  align-items: stretch;
  max-width: 28rem;
  min-width: 0;
  gap: 8px;
}

.search-form input[type="search"] {
  min-width: 0;
  width: 100%;
  padding: 9px 12px;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid #9bacc4;
  border-radius: var(--radius-control);
  line-height: 1.4;
  font-size: 17px;
  -webkit-appearance: none;
  appearance: none;
}

.search-form input::placeholder {
  color: var(--muted);
  opacity: 1;
}

.site-header .search-form {
  width: 230px;
  flex-shrink: 0;
}

.search-form button {
  padding: 9px 13px;
  background: var(--surface);
  color: var(--action);
  border: 1px solid #9bacc4;
  border-radius: var(--radius-control);
  font-size: 17px;
  line-height: 1.4;
}

.search-form button:hover {
  background: var(--blue-soft);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  align-items: center;
  gap: clamp(32px, 5vw, 72px);
  padding-block: clamp(48px, 6.5vw, 96px) 96px;
}

.hero-copy,
.hero-image,
.step-body,
.step-image,
.method-copy {
  min-width: 0;
}

.hero h1 {
  max-width: 14ch;
  margin-block-end: 28px;
}

.lead,
.article-lead {
  font-size: 1.31rem;
  line-height: 1.58;
  max-width: 55ch;
}

.hero .lead {
  margin-block-end: 30px;
}

.button,
button[data-quiz-check] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 11px 20px;
  background: var(--action);
  color: var(--surface);
  border: 1px solid var(--action);
  border-radius: var(--radius-control);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  text-align: center;
  text-decoration: none;
}

.button:hover,
button[data-quiz-check]:not(:disabled):hover {
  background: var(--action-hover);
  color: var(--surface);
  border-color: var(--action-hover);
}

.button-secondary,
button[data-reset-checklist] {
  background: transparent;
  color: var(--action);
  border: 1px solid #b8c8e4;
  border-radius: var(--radius-control);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  padding: 11px 18px;
  min-height: 48px;
}

.button-secondary:hover,
button[data-reset-checklist]:hover {
  background: var(--blue-soft);
  color: var(--action-hover);
  border-color: #8ba8dc;
}

.hero-actions,
.button-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-image img {
  width: 100%;
  aspect-ratio: 1.18;
  object-fit: cover;
  border-radius: var(--radius-image);
}

figcaption {
  margin-block-start: 10px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.5;
}

.learning-section,
.problem-section,
.product-section,
.method-section {
  padding-block: 88px;
  border-block-start: 1px solid var(--line);
}

.section-intro {
  max-width: 740px;
  margin-block-end: 48px;
}

.section-intro h2 {
  margin-block-end: 20px;
}

.section-intro p {
  max-width: 62ch;
  color: var(--muted);
}

.learning-path {
  margin: 0;
  padding: 0;
  list-style: none;
}

.learning-step {
  position: relative;
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) minmax(180px, 280px);
  align-items: start;
  gap: 28px;
  padding-block: 36px;
  border-block-end: 1px solid var(--line);
}

.learning-step:first-child {
  padding-block-start: 0;
}

.learning-step:last-child {
  border-block-end: 0;
  padding-block-end: 0;
}

.step-number {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid #9eb5e3;
  border-radius: 50%;
  background: var(--canvas);
  color: var(--action);
  font-size: 21px;
  line-height: 1;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.step-body h3 {
  margin-block: 3px 16px;
}

.step-body p {
  max-width: 57ch;
  margin-block-end: 20px;
}

.step-links {
  display: flex;
  flex-wrap: wrap;
  column-gap: 24px;
  row-gap: 10px;
  font-size: 18px;
  line-height: 1.4;
}

.step-links a {
  font-weight: 550;
}

.step-image img {
  width: 100%;
  aspect-ratio: 1.5;
  object-fit: cover;
  border-radius: var(--radius-image);
}

.problem-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 64px;
}

.problem-item {
  padding-block: 25px;
  border-block-end: 1px solid var(--line);
  min-width: 0;
}

.problem-item h3 {
  font-size: 1.42rem;
  margin-block-end: 10px;
}

.problem-item h3 a {
  color: var(--ink);
  text-decoration: none;
}

.problem-item h3 a:hover {
  color: var(--action);
  text-decoration: underline;
}

.problem-item p {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.6;
  max-width: 53ch;
}

.product-list {
  border-block-start: 1px solid var(--line);
}

.product-row {
  display: grid;
  grid-template-columns: minmax(170px, 1.1fr) minmax(0, 2fr) minmax(125px, auto);
  align-items: start;
  column-gap: 32px;
  row-gap: 12px;
  padding-block: 28px;
  border-block-end: 1px solid var(--line);
}

.product-name,
.product-name h3 {
  font-size: 1.35rem;
  line-height: 1.28;
  font-weight: 650;
}

.product-name a {
  color: var(--ink);
  text-decoration: none;
}

.product-name a:hover {
  color: var(--action);
  text-decoration: underline;
}

.product-context {
  font-size: 18px;
  line-height: 1.58;
  color: var(--muted);
}

.product-link {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.5;
}

.task-panel {
  margin-block: 16px 88px;
  padding: clamp(24px, 4vw, 48px);
  background: var(--blue-soft);
  border-radius: var(--radius-panel);
}

.task-panel h2,
.task-panel h3 {
  margin-block-end: 20px;
}

.task-panel > p {
  max-width: 65ch;
  margin-block-end: 24px;
}

.checklist {
  margin-block: 24px;
}

.checklist:not(.task-panel),
.task-panel.checklist ul {
  padding: 0;
  list-style: none;
}

.task-panel.checklist ul {
  margin-block: 24px;
}

.task-panel.checklist li {
  padding-inline-start: 0;
}

.checklist li {
  margin-block: 14px;
}

.checklist label {
  display: flex;
  align-items: start;
  gap: 14px;
  padding-block: 6px;
  line-height: 1.5;
  cursor: pointer;
}

.checklist input[type="checkbox"] {
  width: 23px;
  height: 23px;
  margin: 4px 0 0;
  flex: 0 0 23px;
  accent-color: var(--action);
}

.task-progress {
  margin-block: 20px 18px;
  color: var(--action-hover);
  font-size: 18px;
  line-height: 1.5;
  font-variant-numeric: tabular-nums;
}

.task-progress[data-state="storage-error"] {
  color: var(--ink);
}

.method-section {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 64px;
}

.method-copy p {
  margin-block-end: 22px;
  max-width: 61ch;
}

.method-copy p:last-child {
  margin-block-end: 0;
}

.site-footer {
  border-block-start: 1px solid var(--line);
  background: var(--surface);
  padding-block: 48px 32px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.6;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(140px, 0.9fr) minmax(140px, 0.9fr);
  gap: 40px;
}

.site-footer .brand {
  margin-block-end: 16px;
  font-size: 21px;
}

.site-footer p {
  max-width: 46ch;
  margin-block-end: 12px;
}

.site-footer h2,
.site-footer h3 {
  font-size: 18px;
  color: var(--ink);
  margin-block-end: 12px;
}

.site-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-footer li {
  margin-block: 8px;
}

.site-footer a:not(.brand) {
  color: var(--muted);
}

.site-footer a:hover {
  color: var(--action);
}

.footer-note {
  margin-block-start: 32px;
  font-size: 15px;
}

/* Reading pages keep a steady measure; chapter navigation lives beside it. */
.article-header {
  margin-block: 56px 48px;
}

.breadcrumb {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 16px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.5;
  margin-block-end: 24px;
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  padding: 0;
  margin: 0;
}

.article-header h1 {
  max-width: 22ch;
  margin-block-end: 24px;
}

.article-lead {
  max-width: 62ch;
  margin-block-end: 24px;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.5;
}

.article-cover {
  margin-block: 36px 48px;
  max-width: 960px;
}

.article-cover img {
  width: 100%;
  max-height: 550px;
  object-fit: cover;
  border-radius: var(--radius-image);
}

.article-layout {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  align-items: start;
  gap: 64px;
  padding-block-end: 88px;
}

.toc {
  position: sticky;
  inset-block-start: 24px;
  max-height: calc(100dvh - 48px);
  overflow-y: auto;
  padding-block: 4px 20px;
  padding-inline-end: 12px;
  scrollbar-width: thin;
  min-width: 0;
}

.toc h2,
.toc h3,
.toc summary {
  font-family: "Source Sans 3", sans-serif;
  font-size: 18px;
  font-weight: 650;
  line-height: 1.3;
  margin-block-end: 16px;
}

.toc ul,
.toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc li {
  font-size: 16px;
  line-height: 1.45;
  margin-block: 0 13px;
}

.toc a {
  display: block;
  color: var(--muted);
  text-decoration: none;
  padding-block: 3px;
}

.toc a:hover,
.toc a[aria-current="location"] {
  color: var(--action);
  text-decoration: underline;
}

.article-main {
  width: 100%;
  max-width: var(--measure);
  min-width: 0;
}

.article-body {
  overflow-wrap: anywhere;
}

.article-body p {
  margin-block-end: 25px;
  line-height: 1.76;
}

.article-body h2 {
  font-size: clamp(1.8rem, 2.5vw, 2.15rem);
  margin-block: 72px 24px;
}

.article-body > h2:first-child,
.article-body > section:first-child > h2:first-child {
  margin-block-start: 0;
}

.article-body h3 {
  font-size: 1.58rem;
  margin-block: 48px 18px;
}

.article-body h4 {
  font-size: 1.3rem;
  margin-block: 32px 14px;
}

.article-body ul,
.article-body ol {
  padding-inline-start: 26px;
  margin-block: 24px 32px;
}

.article-body li {
  padding-inline-start: 4px;
  margin-block: 10px;
  line-height: 1.6;
}

.article-body li::marker {
  color: var(--action-hover);
}

.article-body figure {
  margin-block: 32px;
}

.article-body figure img {
  width: 100%;
  border-radius: var(--radius-image);
}

.article-body figcaption {
  font-size: 16px;
}

.article-body blockquote {
  margin: 32px 0;
  padding: 20px 24px;
  background: var(--blue-soft);
  border-radius: var(--radius-panel);
}

.article-body blockquote p:last-child {
  margin: 0;
}

.article-body code {
  font-family: ui-monospace, monospace;
  font-size: 0.88em;
  padding: 2px 5px;
  background: #edf1f7;
  border-radius: 3px;
}

.article-body pre {
  max-width: 100%;
  overflow: auto;
  padding: 20px;
  background: #edf1f7;
  border-radius: var(--radius-control);
  font-size: 17px;
  line-height: 1.6;
}

.table-scroll {
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  scrollbar-color: #8397b5 #eef3fd;
  margin-block: 28px 36px;
  padding-block-end: 6px;
}

.article-body .table-scroll-hint {
  margin-block: 22px -12px;
  font-size: 16px;
  line-height: 1.5;
  color: var(--muted);
}

.table-scroll-hint[hidden] {
  display: none;
}

table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 18px;
  line-height: 1.55;
  font-variant-numeric: tabular-nums;
  text-align: start;
}

caption {
  text-align: start;
  font-size: 17px;
  line-height: 1.5;
  color: var(--muted);
  padding-block: 0 16px;
}

th,
td {
  text-align: start;
  vertical-align: top;
  padding: 16px 18px;
  border-block-end: 1px solid var(--line);
}

th {
  font-weight: 650;
}

thead th {
  background: var(--blue-soft);
  color: var(--ink);
}

tbody th {
  width: 37%;
}

.fact-table {
  margin-block: 24px 40px;
}

.orientation {
  background: var(--blue-soft);
  padding: 26px 28px;
  border-radius: var(--radius-panel);
  margin-block: 28px 40px;
}

.orientation h2,
.orientation h3 {
  font-size: 1.35rem;
  margin-block: 0 14px;
}

.orientation p {
  margin-block-end: 16px;
}

.orientation p:last-child,
.orientation ul:last-child {
  margin-block-end: 0;
}

.ad-note {
  margin-block: 24px;
  padding: 16px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-control);
  font-size: 16px;
  line-height: 1.55;
}

.ad-label,
.ad-note > strong:first-child {
  display: inline;
  color: var(--ink);
  background: #fbecaa;
  padding: 1px 5px;
  border-radius: 3px;
}

.learning-diagram {
  padding: 24px 0;
  border-block: 1px solid var(--line);
}

.learning-diagram > ol,
.learning-diagram .diagram-flow {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.learning-diagram > ol > li,
.learning-diagram .diagram-flow > li,
.learning-diagram .diagram-map > div {
  padding: 18px;
  margin: 0;
  background: var(--blue-soft);
  border-radius: var(--radius-control);
  color: var(--ink);
  font-size: 17px;
  line-height: 1.5;
}

.learning-diagram li strong {
  display: block;
  font-size: 19px;
  line-height: 1.3;
  margin-block-end: 10px;
}

.learning-diagram li span {
  display: block;
}

.diagram-map {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
}

.diagram-map dt {
  font-weight: 650;
  font-size: 19px;
  margin-block-end: 10px;
}

.diagram-map dd {
  margin: 0;
}

.learning-diagram figcaption {
  margin-block-start: 18px;
}

.quiz {
  padding: clamp(24px, 3vw, 36px);
  margin-block: 56px;
  background: var(--blue-soft);
  border-radius: var(--radius-panel);
}

.quiz h2,
.quiz h3 {
  font-size: 1.55rem;
  margin-block: 0 18px;
}

.quiz fieldset {
  border: 0;
  padding: 0;
  margin: 0;
  min-width: 0;
}

.quiz legend {
  padding: 0;
  font-size: 1.3rem;
  font-weight: 600;
  line-height: 1.35;
  margin-block-end: 20px;
}

.quiz label {
  display: flex;
  gap: 13px;
  align-items: start;
  padding-block: 11px;
  cursor: pointer;
  font-size: 19px;
  line-height: 1.5;
}

.quiz input[type="radio"] {
  width: 22px;
  height: 22px;
  margin: 4px 0 0;
  flex: 0 0 22px;
  accent-color: var(--action);
}

.quiz button[data-quiz-check] {
  margin-block-start: 22px;
}

.quiz-result {
  margin-block-start: 22px;
  padding: 18px 20px;
  background: var(--surface);
  border-radius: var(--radius-control);
  color: var(--ink);
  font-size: 19px;
  line-height: 1.6;
}

.quiz-result:empty {
  display: none;
}

.quiz-result[data-state="incorrect"] {
  background: #fff8d7;
}

.quiz-result[data-state="correct"] {
  background: #e0ebff;
}

.article-main .task-panel {
  margin-block: 56px;
}

.article-main .task-panel h2 {
  margin-block: 0 20px;
  font-size: 1.7rem;
}

.sources,
.related-list {
  margin-block: 56px;
  padding-block-start: 30px;
  border-block-start: 1px solid var(--line);
}

.sources h2,
.related-list h2 {
  font-size: 1.55rem;
  margin-block: 0 22px;
}

.sources ul,
.sources ol,
.related-list ul {
  margin: 0;
  padding-inline-start: 23px;
}

.sources li,
.related-list li {
  font-size: 17px;
  line-height: 1.6;
  margin-block: 13px;
}

.sources small {
  color: var(--muted);
}

.topic-header,
.search-header,
.page-header {
  padding-block: 64px 48px;
  max-width: 850px;
}

.topic-header h1,
.search-header h1,
.page-header h1 {
  margin-block-end: 24px;
}

.article-index,
.search-results {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 64px;
  padding-block-end: 88px;
}

.article-index article,
.search-results article {
  padding-block: 26px;
  border-block-end: 1px solid var(--line);
  min-width: 0;
}

.article-index h2,
.search-results h2 {
  font-size: 1.55rem;
  margin-block-end: 14px;
}

.article-index p,
.search-results p {
  font-size: 18px;
  color: var(--muted);
  line-height: 1.6;
}

.empty-state {
  padding-block: 32px 72px;
  max-width: 62ch;
}

.empty-state p {
  margin-block-end: 24px;
}

.brand-domain {
  font-weight: 400;
}

.header-search {
  position: relative;
  flex-shrink: 0;
  font-size: 17px;
  line-height: 1.4;
}

.header-search > summary {
  color: var(--action);
  padding: 10px 8px;
  text-underline-offset: 5px;
}

.header-search > summary:hover {
  text-decoration: underline;
}

.header-search .search-form {
  position: absolute;
  inset: calc(100% + 18px) 0 auto auto;
  z-index: 30;
  display: block;
  width: min(390px, calc(100vw - 48px));
  max-width: none;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-panel);
}

.header-search .search-form label {
  display: block;
  font-weight: 600;
  margin-block-end: 12px;
}

.header-search .search-form > div {
  display: flex;
  align-items: stretch;
  gap: 8px;
}

.hero-small {
  margin-block-start: 24px;
  font-size: 17px;
  line-height: 1.5;
  color: var(--muted);
}

.problem-section > p:last-child {
  margin-block-start: 32px;
}

.home-tasks {
  padding-block-start: 16px;
}

.footer-bottom {
  padding-block-start: 28px;
  margin-block-start: 28px;
  border-block-start: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.5;
}

.directory {
  padding-block: 64px 88px;
}

.directory > h1 {
  max-width: 21ch;
  margin-block-end: 24px;
}

.directory > .lead {
  max-width: 62ch;
  margin-block-end: 36px;
}

.directory > section {
  margin-block-start: 64px;
}

.directory > section > h2 {
  margin-block-end: 18px;
}

.directory > section > p {
  max-width: 65ch;
  margin-block-end: 16px;
}

.directory > .product-list {
  margin-block-end: 32px;
}

.directory > p:not(.lead) {
  max-width: 65ch;
  margin-block-end: 20px;
}

.directory .learning-step {
  display: block;
}

.directory .step-body {
  max-width: 65ch;
}

.directory .step-body h2 {
  margin-block: 0 16px;
  font-size: 2rem;
}

.topic-jumps {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  font-size: 18px;
}

.topic-cover {
  max-width: 860px;
  margin-block: 36px 48px;
}

.topic-cover img {
  width: 100%;
  border-radius: var(--radius-image);
}

.legal-page {
  width: min(var(--measure), calc(100% - var(--gutter) * 2));
  padding-block: 64px 88px;
}

.legal-page > h1 {
  margin-block-end: 32px;
}

.legal-page > h1 + h2 {
  margin-block-start: 40px;
}

@media (max-width: 1120px) {
  .site-header > .wrap,
  .header-inner {
    flex-wrap: wrap;
    gap: 18px 28px;
  }

  .site-header .search-form {
    width: 210px;
  }

  .main-nav,
  .nav-links {
    gap: 20px;
  }

  .hero {
    gap: 36px;
  }

  .article-layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 40px;
  }

  .learning-step {
    grid-template-columns: 44px minmax(0, 1fr) 230px;
    gap: 22px;
  }
}

@media (max-width: 900px) {
  .site-header .search-form {
    width: 100%;
    max-width: none;
    flex-basis: 100%;
  }

  .hero {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    padding-block-end: 72px;
  }

  .hero h1 {
    font-size: clamp(2.8rem, 6vw, 3.75rem);
  }

  .hero-image img {
    aspect-ratio: 0.93;
  }

  .lead,
  .article-lead {
    font-size: 1.2rem;
  }

  .learning-step {
    grid-template-columns: 44px minmax(0, 1fr);
  }

  .step-image {
    grid-column: 2;
    max-width: 360px;
  }

  .article-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .toc {
    position: static;
    max-height: none;
    overflow: visible;
    padding: 22px 0 28px;
    border-block: 1px solid var(--line);
  }

  .toc ul,
  .toc ol {
    columns: 2;
    column-gap: 32px;
  }

  .toc li {
    break-inside: avoid;
  }

  .article-main {
    max-width: var(--measure);
  }

  .method-section {
    gap: 40px;
  }

  .product-row {
    grid-template-columns: minmax(140px, 0.8fr) minmax(0, 1.4fr);
    gap: 12px 28px;
  }

  .product-link {
    grid-column: 2;
  }
}

@media (max-width: 680px) {
  :root {
    --gutter: 24px;
  }

  .site-header > .wrap,
  .header-inner {
    min-height: 82px;
    padding-block: 20px;
    gap: 20px 12px;
  }

  .brand {
    font-size: 1.14rem;
    gap: 9px;
  }

  .main-nav {
    margin-inline-start: auto;
    font-size: 17px;
    order: 3;
  }

  .brand {
    order: 1;
  }

  .header-search {
    order: 2;
    margin-inline-start: auto;
  }

  .main-nav ul {
    gap: 12px 24px;
  }

  .main-nav:not(:has(.nav-disclosure)) {
    flex-wrap: wrap;
    justify-content: start;
    flex-basis: 100%;
    margin-inline-start: 0;
    gap: 14px 24px;
  }

  .nav-disclosure > summary {
    display: list-item;
    padding: 10px 12px;
    color: var(--ink);
    border: 1px solid var(--line);
    border-radius: var(--radius-control);
  }

  .nav-disclosure {
    position: relative;
  }

  .nav-disclosure:not([open]) > .nav-links {
    display: none;
  }

  .nav-disclosure[open] > .nav-links {
    position: absolute;
    z-index: 20;
    inset: calc(100% + 10px) 0 auto auto;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    min-width: 230px;
    max-width: calc(100vw - 48px);
    padding: 12px 18px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-panel);
    gap: 0;
  }

  .nav-links a {
    padding-block: 11px;
    display: block;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
    padding-block: 48px 64px;
  }

  .hero h1 {
    max-width: 15ch;
    font-size: clamp(2.8rem, 8vw, 3.5rem);
    margin-block-end: 22px;
  }

  .hero-image img {
    aspect-ratio: 1.35;
  }

  .hero .lead {
    max-width: 45ch;
  }

  .learning-section,
  .problem-section,
  .product-section,
  .method-section {
    padding-block: 64px;
  }

  .section-intro {
    margin-block-end: 36px;
  }

  .learning-step {
    gap: 18px;
    grid-template-columns: 36px minmax(0, 1fr);
    padding-block: 30px;
  }

  .step-number {
    width: 34px;
    height: 34px;
    font-size: 18px;
  }

  .step-body h3 {
    margin-block-start: 0;
    font-size: 1.55rem;
  }

  .step-image {
    grid-column: 2;
  }

  .step-links {
    flex-direction: column;
    align-items: start;
    gap: 13px;
  }

  .problem-list,
  .article-index,
  .search-results,
  .method-section,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .product-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
    padding-block: 26px;
  }

  .product-link {
    grid-column: 1;
    margin-block-start: 4px;
  }

  .task-panel {
    margin-block-end: 64px;
    padding: 26px 24px;
  }

  .method-section {
    gap: 24px;
  }

  .footer-grid {
    gap: 30px;
  }

  .article-header {
    margin-block: 40px 32px;
  }

  .article-header h1 {
    font-size: clamp(2.4rem, 7.6vw, 3.4rem);
    max-width: 20ch;
  }

  .article-cover {
    margin-block: 30px 32px;
  }

  .article-cover img {
    aspect-ratio: 1.35;
    object-fit: cover;
  }

  .article-layout {
    gap: 36px;
    padding-block-end: 64px;
  }

  .toc ul,
  .toc ol {
    columns: 1;
  }

  .toc li {
    font-size: 17px;
    margin-block-end: 10px;
  }

  .article-body h2 {
    margin-block-start: 56px;
    font-size: 1.8rem;
  }

  .article-body h3 {
    font-size: 1.45rem;
  }

  .article-body ul,
  .article-body ol {
    padding-inline-start: 22px;
  }

  .orientation {
    padding: 22px;
  }

  th,
  td {
    padding: 14px;
  }

  .learning-diagram > ol,
  .learning-diagram .diagram-flow,
  .diagram-map {
    grid-template-columns: 1fr;
    padding: 0;
  }

  .learning-diagram > ol > li,
  .learning-diagram .diagram-flow > li,
  .learning-diagram .diagram-map > div {
    padding: 18px;
  }

  .quiz {
    padding: 24px;
  }

  .sources,
  .related-list {
    margin-block: 44px;
  }

  .topic-header,
  .search-header,
  .page-header,
  .directory,
  .legal-page {
    padding-block: 44px 32px;
  }

  .directory > h1,
  .legal-page > h1 {
    font-size: clamp(2.4rem, 7.6vw, 3.4rem);
  }

  .topic-cover {
    margin-block: 28px 32px;
  }
}

@media (max-width: 380px) {
  :root {
    --gutter: 20px;
  }

  .brand {
    font-size: 1.1rem;
  }

  .brand-mark {
    width: 28px;
  }

  .main-nav:has(.nav-disclosure) {
    flex-basis: 100%;
    margin-inline-start: 0;
  }

  .hero h1 {
    font-size: 2.65rem;
  }

  .hero-actions,
  .button-group {
    align-items: stretch;
    flex-direction: column;
  }

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

  .learning-step {
    grid-template-columns: 30px minmax(0, 1fr);
    gap: 12px;
  }

  .step-number {
    width: 28px;
    height: 28px;
    font-size: 16px;
  }

  .task-panel,
  .quiz,
  .orientation {
    padding: 22px 18px;
  }

  .quiz button,
  button[data-reset-checklist] {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation: none !important;
    transition: none !important;
  }
}

@media print {
  @page {
    margin: 18mm;
  }

  body {
    background: #fff;
    color: #000;
    font-size: 11pt;
    line-height: 1.5;
  }

  .site-header,
  .site-footer,
  .toc,
  .quiz,
  .task-panel,
  .skip-link,
  .hero-actions,
  .button-group {
    display: none;
  }

  .wrap,
  .article-main {
    width: 100%;
    max-width: none;
  }

  .article-layout {
    display: block;
  }

  h1 {
    font-size: 30pt;
  }

  .article-body h2 {
    margin-block-start: 24pt;
    font-size: 20pt;
    break-after: avoid;
  }

  .article-body p,
  .article-body li {
    orphans: 3;
    widows: 3;
  }

  .table-scroll {
    overflow: visible;
  }

  table {
    min-width: 0;
    font-size: 10pt;
  }

  figure {
    break-inside: avoid;
  }

  a {
    color: inherit;
  }
}