/* Brainium public site. RTL-first: logical properties only (inline/block, start/end).
   Tokens come from docs/design/README.md. No inline styles anywhere (strict CSP). */

@font-face {
  font-family: "Vazirmatn";
  src: url("../fonts/vazirmatn-33.0.3-wght.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

:root {
  --font: "Vazirmatn", Tahoma, sans-serif;
  --font-mono: Consolas, "Courier New", monospace;
  --text: #3a3256;
  --muted: #6b6486;
  --heading: #260164;
  --accent: #6a12c9;
  --accent-hover: #4f0a9c;
  --dark: #1c0150;
  --on-dark: #f3edfc;
  --lilac: #f1eafb;
  --lilac-light: #f8f4fe;
  --page: #faf8fe;
  --border: #e4dbf3;
  --dashed: #bdb1d6;
  --teal: #03b2ac;
  --teal-text: #0b7f7a;
  --teal-soft: #e3f6f5;
  --danger: #8f1738;
  --danger-border: #b4234a;
  --danger-soft: #fdecef;
  --star: var(--teal);
  --star-empty: #cfc4e6;
  --white: #fff;
  --radius-card: 20px;
  --radius-image: 16px;
  --radius-input: 12px;
  --pill: 999px;
  --container: 1200px;
  --column: 860px;
  --gutter: 32px;
  --shadow: 0 8px 24px rgba(38, 1, 100, 0.12);
  --tap: 44px;
  --toc-tab: 48px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.9;
  color: var(--text);
  background: var(--page);
}

img {
  max-inline-size: 100%;
  block-size: auto;
}

a {
  color: var(--accent);
}

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

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

main:focus {
  outline: none;
}

h1,
h2,
h3,
h4 {
  color: var(--heading);
}

.container {
  max-inline-size: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.column {
  max-inline-size: var(--column);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: absolute;
  inset-inline-start: 16px;
  inset-block-start: -10rem;
  z-index: 100;
  padding: 8px 16px;
  background: var(--white);
  border: 2px solid var(--accent);
  border-radius: var(--radius-input);
}

.skip-link:focus {
  inset-block-start: 16px;
}

/* --- buttons, chips, badges ------------------------------------------------------------ */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-block-size: var(--tap);
  padding-inline: 24px;
  border: 1.5px solid transparent;
  border-radius: var(--pill);
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  white-space: nowrap;
}

.button-large {
  min-block-size: 52px;
  padding-inline: 32px;
  font-size: 17px;
}

.button-primary {
  background: var(--accent);
  color: var(--white);
}

.button-primary:hover {
  background: var(--accent-hover);
  color: var(--white);
}

.button-outline {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--white);
}

.button-dark-outline {
  border-color: var(--heading);
  color: var(--heading);
}

.chip-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip {
  display: inline-block;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--pill);
  padding: 4px 16px;
  font-size: 15px;
  color: var(--text);
}

.chip-soft {
  background: var(--lilac);
}

.chip-link {
  display: inline-flex;
  align-items: center;
  min-block-size: var(--tap);
  padding-inline: 18px;
  text-decoration: none;
}

.chip-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.chip-active,
.chip-active:hover {
  background: var(--heading);
  border-color: var(--heading);
  color: var(--white);
}

.chip-small {
  font-size: 14px;
}

.badge {
  align-self: flex-start;
  display: inline-block;
  border-radius: var(--pill);
  padding: 2px 14px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.badge-teal {
  background: var(--teal-soft);
  color: var(--teal-text);
}

.badge-soft {
  background: var(--lilac);
  color: var(--accent-hover);
}

.icon {
  flex: none;
}

/* --- header ----------------------------------------------------------------------------- */

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-block-size: var(--tap);
  color: var(--heading);
  text-decoration: none;
}

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

.mark {
  display: block;
}

.brand-name {
  font-weight: 800;
  font-size: 24px;
  line-height: 1;
}

.main-nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 32px;
}

.main-nav a,
.menu-panel a {
  color: var(--text);
  font-weight: 500;
  font-size: 16px;
  text-decoration: none;
}

.main-nav a {
  display: inline-flex;
  align-items: center;
  min-block-size: var(--tap);
}

.main-nav a:hover,
.menu-panel a:hover,
.main-nav a[aria-current],
.menu-panel a[aria-current] {
  color: var(--accent);
}

.main-nav a[aria-current],
.menu-panel a[aria-current] {
  font-weight: 700;
}

.main-nav {
  margin-inline-start: auto;
}

.menu {
  display: none;
  position: relative;
}

.menu summary,
.toc summary {
  list-style: none;
  cursor: pointer;
}

.menu summary::-webkit-details-marker,
.toc summary::-webkit-details-marker {
  display: none;
}

.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  inline-size: var(--tap);
  block-size: var(--tap);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-input);
  background: var(--white);
  color: var(--heading);
}

.menu-panel {
  position: absolute;
  inset-inline-end: 0;
  inset-block-start: 52px;
  z-index: 10;
  min-inline-size: 220px;
  padding: 8px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-image);
  box-shadow: var(--shadow);
}

.menu-panel ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.menu-panel a {
  display: flex;
  align-items: center;
  min-block-size: var(--tap);
  padding-inline: 16px;
}

.menu-panel .menu-login {
  color: var(--accent);
  font-weight: 700;
}

/* --- sections ---------------------------------------------------------------------------- */

.section {
  display: flex;
  flex-direction: column;
  gap: 32px;
  padding-block: 72px 88px;
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

.section-title {
  margin: 0;
  font-weight: 800;
  font-size: 34px;
  line-height: 1.4;
}

.section-title-small {
  font-size: 28px;
}

.section-link {
  font-weight: 700;
  font-size: 16px;
  text-decoration: none;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 40px 24px;
  background: var(--white);
  border: 1px dashed var(--dashed);
  border-radius: var(--radius-card);
  text-align: center;
  color: var(--muted);
}

.empty-state p {
  margin: 0;
}

/* --- home -------------------------------------------------------------------------------- */

.hero {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 48px;
  padding-block: 72px 88px;
}

.hero-text {
  flex: 1 1 520px;
  min-inline-size: 0;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.eyebrow {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--teal-text);
  font-weight: 700;
  font-size: 16px;
}

.dot {
  display: block;
  inline-size: 12px;
  block-size: 12px;
  border-radius: var(--pill);
  background: var(--teal);
}

.hero-title {
  margin: 0;
  font-weight: 800;
  font-size: 72px;
  line-height: 1.25;
}

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

.hero-lead {
  margin: 0;
  font-size: 19px;
  font-weight: 500;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-block-start: 8px;
}

.hero-art {
  flex: 1 1 380px;
  min-inline-size: 0;
  display: flex;
  justify-content: center;
}

.hero-circle {
  inline-size: 100%;
  max-inline-size: 460px;
  aspect-ratio: 1 / 1;
  border-radius: var(--pill);
  background: var(--lilac);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-mark {
  inline-size: 78%;
  block-size: auto;
}

.manifesto {
  background: var(--dark);
  color: var(--on-dark);
}

.manifesto-inner {
  display: flex;
  flex-direction: column;
  gap: 48px;
  padding-block: 80px;
}

.manifesto-title {
  margin: 0;
  max-inline-size: 760px;
  font-weight: 800;
  font-size: 38px;
  line-height: 1.4;
  color: var(--white);
}

.manifesto-points {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
}

.manifesto-points p {
  flex: 1 1 280px;
  min-inline-size: 0;
  margin: 0;
  padding-block-start: 20px;
  border-block-start: 3px solid var(--teal);
  font-size: 20px;
  font-weight: 500;
}

.closing {
  background: var(--lilac);
}

.closing-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding-block: 72px;
}

.closing-lead {
  margin: 8px 0 0;
  font-size: 19px;
  font-weight: 500;
}

/* --- cards and grids --------------------------------------------------------------------- */

.card-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}

.card {
  flex: 1 1 320px;
  min-inline-size: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.listing .card {
  flex: 0 1 calc((100% - 48px) / 3);
}

.card-media {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--lilac);
  border-radius: var(--radius-image);
}

.card-media img {
  inline-size: 100%;
  block-size: 100%;
  object-fit: cover;
}

.card-media .card-placeholder,
.course-cover .card-placeholder {
  inline-size: 84px;
  block-size: auto;
  opacity: 0.45;
}

.card-category {
  align-self: flex-start;
  font-size: 14px;
  font-weight: 700;
  color: var(--teal-text);
  text-decoration: none;
}

.card-title {
  margin: 0;
  font-weight: 700;
  font-size: 20px;
  line-height: 1.6;
}

.card-title a {
  color: var(--heading);
  text-decoration: none;
}

.card-title a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.card-excerpt {
  margin: 0;
  font-size: 15px;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

/* Horizontal sliders and chip rows: plain wrapping grids on desktop, scroll-snap on phones. */
.slider,
.chip-row {
  scrollbar-width: none;
}

.slider::-webkit-scrollbar,
.chip-row::-webkit-scrollbar {
  display: none;
}

/* --- listing ----------------------------------------------------------------------------- */

.listing {
  display: flex;
  flex-direction: column;
  gap: 32px;
  padding-block: 40px 88px;
}

.listing-head {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-inline-size: 760px;
}

.page-title {
  margin: 0;
  font-weight: 800;
  font-size: 40px;
  line-height: 1.4;
}

.listing-intro {
  margin: 0;
  font-size: 18px;
}

.breadcrumb ol {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--muted);
}

.breadcrumb li + li::before {
  content: "›";
  margin-inline-end: 8px;
}

.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}

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

.pagination ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 8px;
}

.pagination a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-inline-size: var(--tap);
  min-block-size: var(--tap);
  padding-inline: 14px;
  border: 1px solid var(--border);
  border-radius: var(--pill);
  background: var(--white);
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
}

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

.pagination a[aria-current] {
  background: var(--heading);
  border-color: var(--heading);
  color: var(--white);
}

.page-gap {
  padding-inline: 4px;
  color: var(--muted);
}

/* --- article ----------------------------------------------------------------------------- */

.article-head {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding-block-start: 40px;
}

.article-intro {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.article-title {
  margin: 0;
  font-weight: 800;
  font-size: 46px;
  line-height: 1.5;
}

.article-excerpt {
  margin: 0;
  font-size: 20px;
}

.article-meta {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  font-size: 14px;
  color: var(--muted);
}

.article-author {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.author-name {
  font-weight: 700;
  color: var(--heading);
}

.featured {
  margin: 0;
}

.featured img {
  display: block;
  inline-size: 100%;
  max-block-size: 460px;
  object-fit: cover;
  border-radius: var(--radius-card);
  background: var(--lilac);
}

.article-wrap {
  position: relative;
}

.article-body {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding-block: 48px 64px;
  min-inline-size: 0;
}

.prose {
  font-size: 18px;
  line-height: 2.1;
  overflow-wrap: break-word;
}

.prose > * {
  margin-block: 0 20px;
}

.prose h2,
.prose h3,
.prose h4 {
  scroll-margin-block-start: 96px;
}

.prose h2 {
  margin-block-start: 36px;
  font-weight: 800;
  font-size: 30px;
  line-height: 1.5;
}

.prose h3 {
  margin-block-start: 28px;
  font-weight: 700;
  font-size: 23px;
  line-height: 1.6;
}

.prose h4 {
  margin-block-start: 24px;
  font-weight: 700;
  font-size: 19px;
}

.prose ul,
.prose ol {
  padding-inline-start: 28px;
}

.prose li + li {
  margin-block-start: 6px;
}

.prose li > p {
  margin: 0;
}

.prose blockquote {
  margin-inline: 0;
  padding-block-start: 20px;
  border-block-start: 3px solid var(--teal);
  font-size: 22px;
  font-weight: 500;
  line-height: 1.9;
  color: var(--heading);
}

.prose blockquote > p {
  margin: 0;
}

.prose pre {
  overflow-x: auto;
  overscroll-behavior-x: contain;
  padding: 16px 20px;
  background: var(--dark);
  color: var(--on-dark);
  border-radius: var(--radius-input);
  font-size: 15px;
  line-height: 1.8;
  text-align: start;
}

.prose code {
  font-family: var(--font-mono);
}

.prose :not(pre) > code {
  padding: 1px 6px;
  background: var(--lilac);
  border-radius: 6px;
  font-size: 0.9em;
}

.prose figure {
  margin-inline: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.prose figure img {
  display: block;
  inline-size: 100%;
  border-radius: var(--radius-image);
}

.prose figcaption {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.prose figcaption .credit {
  display: block;
  font-size: 13px;
}

.prose hr {
  border: 0;
  border-block-start: 1px solid var(--border);
}

.prose .table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-x: contain;
}

.prose table {
  inline-size: 100%;
  border-collapse: collapse;
  font: inherit;
  text-align: end;
}

.prose th,
.prose td {
  padding: 0.6em 0.85em;
  border: 1px solid var(--border);
  vertical-align: top;
}

.prose th {
  background: var(--lilac);
  font-weight: 700;
  border-block-end: 2px solid var(--accent);
}

.prose tr:not(:last-child) td {
  border-block-end: 1px solid var(--border);
}

.tag-list {
  margin-block-start: 8px;
}

.author-box {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  margin-block-start: 16px;
  padding: 24px;
  background: var(--lilac);
  border-radius: var(--radius-image);
}

.author-box-text {
  flex: 1 1 280px;
  min-inline-size: 0;
  font-size: 15px;
}

.author-box-text p {
  margin: 0;
}

.author-box-name {
  font-weight: 800;
  color: var(--heading);
  font-size: 17px;
}

/* Table of contents: a sticky, semi-transparent tab on the inline-start (right) edge. */
.toc-rail {
  position: absolute;
  inset-block: 0;
  inset-inline-start: 0;
  inline-size: 0;
  z-index: 20;
}

.toc {
  position: sticky;
  inset-block-start: 104px;
  inline-size: var(--toc-tab);
}

.toc-tab {
  display: flex;
  align-items: center;
  justify-content: center;
  inline-size: var(--toc-tab);
  block-size: 48px;
  border: 1px solid rgba(207, 196, 230, 0.9);
  border-inline-start: 0;
  border-start-end-radius: 14px;
  border-end-end-radius: 14px;
  background: rgba(255, 255, 255, 0.72);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: var(--heading);
  box-shadow: 0 4px 16px rgba(38, 1, 100, 0.1);
}

.toc[open] .toc-tab {
  background: var(--white);
}

.toc-panel {
  position: absolute;
  inset-block-start: 0;
  inset-inline-start: calc(var(--toc-tab) + 8px);
  inline-size: min(300px, 72vw);
  max-block-size: calc(100vh - 140px);
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 20px 24px;
  background: rgba(255, 255, 255, 0.96);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--radius-image);
  box-shadow: var(--shadow);
  font-size: 15px;
}

.toc-title {
  margin: 0 0 8px;
  font-weight: 800;
  color: var(--heading);
}

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

.toc-panel a {
  display: block;
  padding-block: 6px;
  color: var(--text);
  text-decoration: none;
  line-height: 1.7;
}

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

.toc-level-3 a {
  padding-inline-start: 16px;
  font-size: 14px;
  color: var(--muted);
}

.related {
  background: var(--white);
  border-block-start: 1px solid var(--border);
}

.related-inner {
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding-block: 56px 64px;
}

.related .card {
  flex-basis: 280px;
}

.related .card-title {
  font-size: 19px;
}

/* --- courses ---------------------------------------------------------------------------- */

.course-card {
  flex: 1 1 320px;
  min-inline-size: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
}

.listing .course-card {
  flex: 0 1 calc((100% - 48px) / 3);
}

/* The 16:9 cover is cropped to 16:10 on cards. */
.course-cover {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--lilac);
}

.course-cover img {
  inline-size: 100%;
  block-size: 100%;
  object-fit: cover;
}

.course-body {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px;
}

.course-foot {
  margin-block-start: auto;
  padding-block-start: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-block-start: 1px solid var(--border);
}

.course-price {
  font-weight: 800;
  font-size: 18px;
  color: var(--heading);
}

.course-price-muted {
  font-weight: 700;
  font-size: 15px;
  color: var(--muted);
}

.course-more {
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
}

.course-page {
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding-block: 40px 72px;
}

.course-intro {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.course-hero img {
  aspect-ratio: 16 / 9;
  max-block-size: none;
}

.calm-notice {
  margin: 0;
  padding: 16px 20px;
  background: var(--lilac-light);
  border: 1px solid var(--border);
  border-radius: var(--radius-image);
  color: var(--heading);
  font-weight: 500;
}

.course-section {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.course-section-title,
.info-card-title {
  margin: 0;
  font-weight: 800;
  font-size: 28px;
  line-height: 1.5;
}

.check-list,
.sub-list,
.question-list,
.spec-list,
.chapter-sessions {
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 18px;
}

.check-list > li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.check-icon {
  margin-block-start: 6px;
  color: var(--teal-text);
}

.sub-list {
  margin-block-start: 6px;
  padding-inline-start: 4px;
  font-size: 16px;
  color: var(--text);
}

.sub-list li::before {
  content: "•";
  margin-inline-end: 8px;
  color: var(--teal);
}

.question-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.question-list li {
  padding: 14px 18px;
  background: var(--white);
  border: 1px solid var(--border);
  border-inline-start: 3px solid var(--teal);
  border-radius: var(--radius-input);
}

.syllabus,
.faq {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chapter,
.faq-item {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-image);
}

.chapter summary,
.faq-item summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  min-block-size: var(--tap);
  padding: 14px 20px;
  cursor: pointer;
  font-weight: 700;
  color: var(--heading);
}

.chapter-meta {
  font-weight: 500;
  font-size: 14px;
  color: var(--muted);
}

.chapter-sessions {
  padding: 0 20px 16px;
  counter-reset: session;
}

.chapter-sessions li {
  padding-block: 6px;
  border-block-start: 1px solid var(--lilac);
  counter-increment: session;
}

.faq-item p {
  margin: 0;
  padding: 0 20px 16px;
}

.info-cards {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.info-card {
  flex: 1 1 280px;
  min-inline-size: 0;
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-image);
}

.info-card-title {
  font-size: 22px;
}

.info-card p {
  margin: 8px 0 0;
  white-space: pre-line;
}

.path-note {
  margin: 0;
  padding: 18px 20px;
  background: var(--teal-soft);
  border-inline-start: 4px solid var(--teal);
  border-radius: var(--radius-input);
  color: var(--teal-text);
  font-weight: 700;
}

.spec-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
}

.spec-list li {
  display: flex;
  flex-direction: column;
  padding: 16px 20px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
}

.spec-label {
  font-size: 14px;
  color: var(--muted);
}

.spec-value {
  font-weight: 800;
  color: var(--heading);
}

/* The single filled star before the average rating in «مشخصات دوره». */
.spec-star {
  display: inline-flex;
  vertical-align: -3px;
  margin-inline-end: 4px;
}

.spec-notice {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.instructor-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.instructor-card {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 24px;
  background: var(--lilac-light);
  border: 1px solid var(--border);
  border-radius: var(--radius-image);
}

.instructor-photo {
  flex: none;
  inline-size: 96px;
  block-size: 96px;
  object-fit: cover;
  border-radius: var(--pill);
  background: var(--lilac);
}

.instructor-text {
  min-inline-size: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.instructor-name {
  margin: 0;
  font-weight: 800;
  font-size: 20px;
}

.instructor-role {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--teal-text);
}

.instructor-bio {
  margin: 4px 0 0;
  font-size: 16px;
  white-space: pre-line;
}

.instructor-links,
.material-items,
.reference-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.instructor-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin-block-start: 4px;
  font-size: 15px;
}

.instructor-links a {
  display: inline-flex;
  align-items: center;
  min-block-size: var(--tap);
}

.material-group-title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
}

.material-items,
.reference-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.material-items li,
.reference-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 12px 16px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
}

.material-title {
  font-weight: 700;
  color: var(--heading);
}

.material-size,
.reference-author {
  font-size: 14px;
  color: var(--muted);
}

.material-description {
  flex-basis: 100%;
  font-size: 15px;
}

.reference-kind {
  padding: 0 10px;
  font-size: 13px;
  font-weight: 700;
  color: var(--teal-text);
  background: var(--teal-soft);
  border-radius: var(--pill);
}

/* Sticky enrolment bar at the bottom of a published course page. */
.has-enroll-bar .site-footer {
  padding-block-end: 96px;
}

.enroll-bar {
  position: fixed;
  inset-inline: 0;
  inset-block-end: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.96);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-block-start: 1px solid var(--border);
  box-shadow: 0 -4px 16px rgba(38, 1, 100, 0.08);
}

.enroll-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-block: 14px;
}

.enroll-info {
  display: flex;
  flex-direction: column;
  min-inline-size: 0;
}

.enroll-title {
  font-weight: 700;
  color: var(--heading);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.enroll-price {
  font-weight: 800;
  font-size: 20px;
  color: var(--heading);
}

.enroll-pending {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.button-disabled,
.button-disabled:hover {
  background: var(--dashed);
  color: var(--white);
  cursor: not-allowed;
}

.enroll-note {
  font-size: 12px;
  color: var(--muted);
}

/* --- static and error pages -------------------------------------------------------------- */

.static-page {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding-block: 40px 72px;
}

.error-page {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  padding-block: 64px 96px;
}

.error-page p {
  margin: 0;
  font-size: 18px;
}

.error-code {
  font-weight: 800;
  font-size: 20px;
  color: var(--teal-text);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-block-start: 8px;
}

/* --- footer ------------------------------------------------------------------------------ */

.site-footer {
  background: var(--white);
  border-block-start: 1px solid var(--border);
}

.footer-main {
  display: flex;
  flex-wrap: wrap;
  gap: 48px;
  padding-block: 56px 40px;
}

.footer-brand {
  flex: 1 1 360px;
  min-inline-size: 0;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.footer-brand-text {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.brand-footer .brand-name {
  font-size: 22px;
}

.footer-tagline {
  margin: 0;
  font-size: 15px;
  color: var(--muted);
}

.enamad {
  flex: none;
}

.enamad-placeholder {
  inline-size: 112px;
  block-size: 112px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  border: 1.5px dashed var(--dashed);
  border-radius: var(--radius-input);
  text-align: center;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.footer-nav {
  flex: 0 1 180px;
  min-inline-size: 0;
  font-size: 15px;
}

.footer-title {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
}

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

.footer-nav a {
  display: inline-flex;
  align-items: center;
  min-block-size: var(--tap);
  color: var(--text);
  text-decoration: none;
}

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

.footer-bottom {
  border-block-start: 1px solid var(--border);
}

.footer-bottom p {
  margin: 0 auto;
  padding-block: 20px;
  font-size: 14px;
  color: var(--muted);
}

/* --- login and account (S1-4c) ----------------------------------------------------------- */

.link-button {
  display: inline-flex;
  align-items: center;
  min-block-size: var(--tap);
  padding: 0;
  border: 0;
  background: none;
  color: var(--accent);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.link-button:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.link-button:disabled {
  color: var(--muted);
  cursor: default;
  text-decoration: none;
}

.account-menu {
  position: relative;
}

.account-menu summary {
  list-style: none;
  cursor: pointer;
}

.account-menu summary::-webkit-details-marker {
  display: none;
}

.account-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-block-size: var(--tap);
  padding-inline: 18px;
  border: 1.5px solid var(--border);
  border-radius: var(--pill);
  background: var(--white);
  color: var(--heading);
  font-weight: 700;
  font-size: 15px;
}

.account-toggle:hover,
.account-menu[open] .account-toggle {
  border-color: var(--accent);
}

.account-name {
  max-inline-size: 18ch;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.account-panel {
  position: absolute;
  inset-inline-end: 0;
  inset-block-start: 52px;
  z-index: 10;
  display: flex;
  flex-direction: column;
  min-inline-size: 180px;
  padding: 8px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-image);
  box-shadow: var(--shadow);
}

.account-panel a,
.account-panel .link-button {
  display: flex;
  align-items: center;
  inline-size: 100%;
  min-block-size: var(--tap);
  padding-inline: 16px;
  color: var(--text);
  font-weight: 500;
  font-size: 16px;
  text-decoration: none;
}

.account-panel a:hover,
.account-panel .link-button:hover {
  color: var(--accent);
  text-decoration: none;
}

.account-panel form,
.menu-panel form {
  margin: 0;
}

.menu-account-name {
  padding-inline: 16px;
  padding-block-start: 8px;
  border-block-start: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}

.menu-panel .menu-logout {
  padding-inline: 16px;
  color: var(--text);
  font-weight: 500;
}

.auth-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  padding-block: 56px 88px;
  padding-inline: var(--gutter);
}

.auth-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  inline-size: 100%;
  max-inline-size: 440px;
  padding: 32px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
}

.auth-mark {
  align-self: center;
}

.auth-title {
  margin: 0;
  font-weight: 800;
  font-size: 26px;
  line-height: 1.5;
  text-align: center;
}

.auth-subtitle {
  margin: 0;
  font-weight: 800;
  font-size: 21px;
}

.auth-lead,
.auth-terms,
.auth-hint,
.auth-empty,
.account-mobile {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.auth-lead {
  text-align: center;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
}

.auth-label {
  color: var(--heading);
  font-weight: 700;
  font-size: 15px;
}

.auth-input {
  inline-size: 100%;
  min-block-size: 52px;
  padding-inline: 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-input);
  background: var(--lilac-light);
  color: var(--heading);
  font: inherit;
  font-size: 18px;
}

.auth-input:focus {
  border-color: var(--accent);
  background: var(--white);
}

.auth-input[aria-invalid="true"] {
  border-color: var(--danger-border);
}

.auth-input[dir="ltr"] {
  text-align: start;
}

.auth-code {
  letter-spacing: 0.4em;
  font-size: 24px;
  font-weight: 700;
  text-align: center;
}

.auth-submit {
  inline-size: 100%;
  min-block-size: 52px;
  margin-block-start: 6px;
  cursor: pointer;
  font-family: inherit;
}

.auth-resend,
.auth-alt {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin: 0;
  font-size: 15px;
}

.resend-status {
  flex-basis: 100%;
  margin: 0;
  text-align: center;
}

.resend-status.is-waiting {
  color: var(--danger);
}

.resend-status.is-ready {
  color: var(--teal-text);
  font-weight: 700;
}

.form-alert,
.form-notice {
  margin: 0;
  padding: 10px 14px;
  border-radius: var(--radius-input);
  font-size: 15px;
  line-height: 1.8;
}

.form-alert {
  background: var(--danger-soft);
  color: var(--danger);
}

.form-notice {
  background: var(--teal-soft);
  color: var(--teal-text);
}

.my-courses {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.my-courses li {
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  background: var(--lilac-light);
  font-weight: 700;
}

.my-courses a {
  text-decoration: none;
}

.my-courses .my-course-files {
  margin-inline-start: 12px;
  font-size: 0.875rem;
  font-weight: 400;
  text-decoration: underline;
}

.auth-card > .button {
  align-self: flex-start;
}

.auth-logout {
  margin: 0;
}

.auth-logout .button {
  cursor: pointer;
  font-family: inherit;
}

/* --- comments and ratings (S1-4d) ------------------------------------------------------- */

.visually-hidden {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.comments {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-block-start: 32px;
}

.course-page .comments {
  margin-block-start: 48px;
}

.comments-title {
  margin: 0;
  font-weight: 800;
  font-size: 28px;
  line-height: 1.5;
}

.comments-count {
  font-size: 18px;
  font-weight: 500;
  color: var(--muted);
}

.comments-intro,
.comments-empty {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.comments-empty {
  padding: 20px;
  border: 1px dashed var(--dashed);
  border-radius: var(--radius-image);
  font-size: 15px;
  text-align: center;
}

.comment-gate {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px;
  background: var(--lilac);
  border-radius: var(--radius-image);
}

.comment-gate-text {
  margin: 0;
  font-size: 15px;
  font-weight: 500;
  color: var(--heading);
}

.comment-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0;
  padding: 20px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-image);
}

.comment-label {
  padding: 0;
  font-weight: 700;
  font-size: 15px;
  color: var(--heading);
}

.comment-textarea {
  inline-size: 100%;
  padding: 12px 14px;
  border: 1.5px solid #cfc4e6;
  border-radius: var(--radius-input);
  background: var(--white);
  color: var(--text);
  font: inherit;
  font-size: 16px;
  line-height: 1.9;
  resize: vertical;
}

.comment-textarea:focus {
  border-color: var(--accent);
}

.comment-textarea[aria-invalid="true"] {
  border-color: var(--danger-border);
}

.comment-form-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.comment-as {
  font-size: 14px;
  color: var(--muted);
}

.comment-submit {
  cursor: pointer;
  font-family: inherit;
}

.comment-replying {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin: 0;
  padding: 4px 14px;
  background: var(--lilac-light);
  border-radius: var(--radius-input);
  font-size: 15px;
  font-weight: 700;
  color: var(--heading);
}

.comment-replying a {
  display: inline-flex;
  align-items: center;
  min-block-size: var(--tap);
  font-weight: 500;
}

/* Honeypot: off screen for people (and hidden from screen readers), still a field for bots. */
.hp-field {
  position: absolute;
  inset-inline-start: -10000px;
  inline-size: 1px;
  block-size: 1px;
  overflow: hidden;
}

/* Star input: radios in the order 5..1, laid out reversed so that 1 is at the start (right).
   A checked or hovered star lights itself and the smaller ones (its following siblings). */
.star-input {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 16px;
  margin: 0;
  padding: 0;
  border: 0;
  min-inline-size: 0;
}

.star-input legend {
  float: inline-start;
  inline-size: 100%;
  margin-block-end: 4px;
}

.star-choices {
  display: inline-flex;
  flex-direction: row-reverse;
  justify-content: flex-end;
}

.star-radio {
  position: absolute;
  opacity: 0;
  inline-size: 1px;
  block-size: 1px;
  margin: 0;
}

.star-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  inline-size: var(--tap);
  block-size: var(--tap);
  cursor: pointer;
  border-radius: var(--radius-input);
}

.star-label .star {
  inline-size: 30px;
  block-size: 30px;
}

.star {
  fill: var(--star-empty);
}

.star-on,
.star-radio:checked ~ .star-label .star,
.star-label:hover .star,
.star-label:hover ~ .star-label .star {
  fill: var(--star);
}

.star-choices:hover .star-radio:checked ~ .star-label .star {
  fill: var(--star-empty);
}

.star-choices:hover .star-label:hover .star,
.star-choices:hover .star-label:hover ~ .star-label .star {
  fill: var(--star);
}

.star-radio:focus-visible + .star-label,
.star-radio:focus-visible + .star-clear {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.star-clear {
  display: inline-flex;
  align-items: center;
  min-block-size: var(--tap);
  padding-inline: 8px;
  font-size: 14px;
  color: var(--muted);
  cursor: pointer;
  border-radius: var(--radius-input);
}

.star-radio:checked + .star-clear {
  color: var(--heading);
  font-weight: 700;
}

.stars {
  display: inline-flex;
  gap: 2px;
  align-self: flex-start;
}

.rating-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-weight: 700;
  color: var(--heading);
}

.rating-summary .stars {
  align-self: center;
}

.comment-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.comment {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-image);
}

.comment-reply {
  margin-inline-start: 32px;
  background: var(--lilac-light);
  border-color: transparent;
}

.comment-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.comment-avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  inline-size: 40px;
  block-size: 40px;
  border-radius: var(--pill);
  background: var(--lilac);
  color: var(--accent-hover);
  font-weight: 800;
}

.comment-author {
  font-weight: 700;
  color: var(--heading);
}

.comment-badge {
  padding-inline: 10px;
  border-radius: var(--pill);
  background: var(--teal-soft);
  color: var(--teal-text);
  font-size: 12px;
  font-weight: 700;
}

.comment-date {
  font-size: 14px;
  color: var(--muted);
}

.comment-body {
  margin: 0;
  font-size: 16px;
  white-space: pre-line;
  overflow-wrap: anywhere;
}

/* Text and «پاسخ» side by side: the text column shrinks, the pill sits at the end (left)
   level with the last line, and wraps below only when the text would get narrower than
   about 200px. */
.comment-content {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 8px 16px;
}

.comment-main {
  display: flex;
  flex: 1 1 200px;
  flex-direction: column;
  gap: 8px;
  min-inline-size: 0;
}

.comment-reply-link {
  display: inline-flex;
  flex: none;
  align-items: center;
  margin-inline-start: auto;
  min-block-size: var(--tap);
  padding-inline: 18px;
  border: 1px solid var(--border);
  border-radius: var(--pill);
  background: var(--white);
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.comment-reply-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* A thread: the root comment, then its replies in a <details> toggle («۳ پاسخ»), closed by
   default; the chevron points down when closed and up when open. */
.comment-thread {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.comment-replies > summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-block-size: var(--tap);
  padding-inline: 16px;
  border: 1px solid var(--border);
  border-radius: var(--pill);
  background: var(--white);
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
  list-style: none;
  cursor: pointer;
}

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

.comment-replies > summary:hover {
  border-color: var(--accent);
}

.replies-chevron {
  display: inline-flex;
  transition: transform 0.15s ease;
}

.comment-replies[open] > summary .replies-chevron {
  transform: rotate(180deg);
}

.reply-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.comment-in-reply {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

/* «بیشتر» / «جمع کردن دیدگاه‌ها»: a visually hidden (still focusable) checkbox; the labels
   are the buttons and show the focus ring while the checkbox has keyboard focus. */
.comments-toggle {
  position: absolute;
  opacity: 0;
  inline-size: 1px;
  block-size: 1px;
  margin: 0;
}

.comments-more,
.comments-less {
  align-self: center;
  cursor: pointer;
}

.comments-less,
.comment-hidden {
  display: none;
}

.comments-toggle:checked ~ .comment-list .comment-hidden {
  display: flex;
}

.comments-toggle:checked ~ .comments-more {
  display: none;
}

.comments-toggle:checked ~ .comments-less {
  display: inline-flex;
}

.comments-toggle:focus-visible ~ .comments-more,
.comments-toggle:focus-visible ~ .comments-less {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.my-comments {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.my-comment {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  background: var(--lilac-light);
}

.my-comment-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  font-size: 14px;
  color: var(--muted);
}

.my-comment-subject {
  font-weight: 700;
  color: var(--heading);
}

.my-comment-body {
  margin: 0;
  font-size: 15px;
  white-space: pre-line;
  overflow-wrap: anywhere;
}

.status-chip {
  padding-inline: 10px;
  border-radius: var(--pill);
  font-size: 12px;
  font-weight: 700;
  background: var(--lilac);
  color: var(--accent-hover);
}

.status-chip-approved {
  background: var(--teal-soft);
  color: var(--teal-text);
}

.status-chip-rejected {
  background: var(--danger-soft);
  color: var(--danger);
}

.my-comment-delete {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 12px;
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

.my-comment-delete .link-button {
  color: var(--danger);
}

/* The table-of-contents tab must never cover the article column: below ~920px the column's
   own gutter is narrower than the tab, so the column reserves the tab width plus 8px. The
   header (breadcrumb, title, summary, meta line) takes the same gutter so the whole article
   shares one right edge; the featured image reaches back over the extra gutter, so it keeps
   its normal width. */
@media (max-width: 920px) {
  .article-wrap > .column,
  .article-head {
    padding-inline-start: calc(var(--toc-tab) + 8px);
  }

  .article-head > .featured {
    margin-inline-start: calc(var(--gutter) - var(--toc-tab) - 8px);
  }
}

/* --- phones (below 720px) ---------------------------------------------------------------- */

@media (max-width: 720px) {
  :root {
    --gutter: 20px;
  }

  .comments-title {
    font-size: 24px;
  }

  .comment-reply {
    margin-inline-start: 16px;
  }

  .comment,
  .comment-form,
  .comment-gate {
    padding: 16px;
  }

  .comment-submit {
    inline-size: 100%;
  }

  .site-header {
    position: sticky;
    inset-block-start: 0;
    z-index: 50;
  }

  .header-inner {
    padding-block: 12px;
  }

  .main-nav,
  .login-link,
  .account-menu {
    display: none;
  }

  .auth-page {
    padding-block: 28px 56px;
  }

  .auth-card {
    padding: 24px 20px;
  }

  .menu {
    display: block;
  }

  .section {
    padding-block: 36px;
  }

  .hero {
    padding-block: 36px;
  }

  .hero-title {
    font-size: 42px;
  }

  .section-title,
  .manifesto-title,
  .page-title {
    font-size: 26px;
  }

  .manifesto-inner,
  .closing-inner {
    padding-block: 36px;
  }

  .article-title {
    font-size: 30px;
  }

  .article-excerpt {
    font-size: 18px;
  }

  .listing {
    padding-block: 24px 48px;
  }

  .listing .card,
  .listing .course-card {
    flex-basis: 100%;
  }

  .course-section-title {
    font-size: 23px;
  }

  .instructor-card {
    flex-direction: column;
    padding: 20px;
  }

  .enroll-title {
    display: none;
  }

  .enroll-inner {
    padding-block: 10px;
    flex-wrap: nowrap;
  }

  .enroll-price {
    font-size: 17px;
  }

  .enroll-bar .button-large {
    padding-inline: 20px;
    font-size: 15px;
  }

  .slider,
  .chip-row {
    flex-wrap: nowrap;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    margin-inline: calc(-1 * var(--gutter));
    padding-inline: var(--gutter);
  }

  .slider {
    gap: 14px;
    padding-block-end: 12px;
    scroll-snap-type: x mandatory;
    scroll-padding-inline: var(--gutter);
  }

  .slider > * {
    flex: 0 0 82%;
    scroll-snap-align: start;
  }

  .chip-row {
    padding-block-end: 4px;
  }

  .chip-row li {
    flex: none;
    white-space: nowrap;
  }

  :root {
    --toc-tab: 36px;
  }

  .toc-tab {
    block-size: var(--tap);
  }

  .toc {
    inset-block-start: 88px;
  }

  .footer-main {
    gap: 28px;
  }

  .footer-brand {
    flex-basis: 100%;
  }

  .footer-nav {
    flex: 1 1 40%;
  }

  .enamad-placeholder {
    inline-size: 88px;
    block-size: 88px;
    font-size: 11px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .slider {
    scroll-snap-type: none;
  }

  .replies-chevron {
    transition: none;
  }
}

/* --- license key display and copy button (S3c) ------------------------------------------ */

.license-key {
  display: inline-block;
  font-family: monospace;
  font-size: 15px;
  direction: ltr;
  word-break: break-all;
  user-select: text;
  -webkit-user-select: text;
  background: var(--surface, #f5f5f5);
  padding: 4px 8px;
  border-radius: 6px;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-block-size: var(--tap, 44px);
  padding-inline: 16px;
  border: 1.5px solid var(--accent);
  border-radius: var(--pill, 999px);
  background: var(--white, #fff);
  color: var(--accent);
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
  font-family: inherit;
  margin-inline-start: 8px;
}