:root {
  --course-bg: #03100d;
  --course-bg-deep: #020806;
  --course-panel: #081b17;
  --course-panel-2: #0d251e;
  --course-ink: #f3fbf7;
  --course-soft: #c6d5cf;
  --course-muted: #8fa59d;
  --course-line: rgba(170, 214, 199, 0.2);
  --course-line-strong: rgba(170, 214, 199, 0.38);
  --course-green: #78f0b2;
  --course-gold: #f5b84b;
  --course-gold-soft: #ffd989;
  --course-cyan: #74d7ff;
  --paper: #f3eddf;
  --paper-raised: #fffaf0;
  --paper-ink: #272b28;
  --paper-muted: #59635d;
  --paper-line: #d6d4c9;
  --paper-green: #0b6b42;
  --paper-code: #071510;
  --paper-code-ink: #e6f8ee;
  --sidebar-width: 19rem;
  --content-width: 72rem;
  --header-height: 4.5rem;
  --radius: 0.65rem;
  --shadow: 0 1.6rem 4rem rgba(0, 0, 0, 0.3);
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --display: Georgia, "Times New Roman", serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1rem);
}

body.course-page {
  min-width: 20rem;
  margin: 0;
  background:
    radial-gradient(circle at 78% 0%, rgba(31, 117, 83, 0.17), transparent 30rem),
    linear-gradient(180deg, var(--course-bg-deep), var(--course-bg) 34rem, #05130f);
  color: var(--course-ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.65;
}

body.course-page::before {
  position: fixed;
  z-index: 1000;
  inset: 0;
  content: "";
  pointer-events: none;
  opacity: 0.08;
  background-image:
    repeating-linear-gradient(to bottom, rgba(255, 255, 255, 0.055) 0 1px, transparent 1px 4px),
    radial-gradient(circle at center, transparent 42%, rgba(0, 0, 0, 0.48) 125%);
  mix-blend-mode: screen;
}

body.nav-open {
  overflow: hidden;
}

img {
  max-width: 100%;
}

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

code,
kbd,
pre {
  font-family: var(--mono);
}

::selection {
  background: var(--course-gold);
  color: #171006;
}

:focus-visible {
  outline: 0.2rem solid var(--course-gold);
  outline-offset: 0.22rem;
}

.skip-link {
  position: fixed;
  z-index: 3000;
  top: 0.75rem;
  left: 0.75rem;
  transform: translateY(-180%);
  padding: 0.65rem 1rem;
  border-radius: 0.4rem;
  background: var(--course-gold);
  color: #171006;
  font-weight: 900;
  text-decoration: none;
}

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

.reading-progress {
  position: fixed;
  z-index: 2200;
  top: 0;
  right: 0;
  left: 0;
  height: 0.2rem;
  background: rgba(255, 255, 255, 0.05);
}

.reading-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--course-green), var(--course-gold));
  box-shadow: 0 0 1rem rgba(120, 240, 178, 0.72);
}

.course-header {
  position: sticky;
  z-index: 2000;
  top: 0;
  min-height: var(--header-height);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(1rem, 3vw, 3rem);
  padding: 0.65rem clamp(1rem, 3vw, 2.75rem);
  border-bottom: 1px solid rgba(170, 214, 199, 0.14);
  background: rgba(3, 12, 10, 0.94);
  backdrop-filter: blur(1.1rem) saturate(125%);
}

.course-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--course-ink);
  text-decoration: none;
  white-space: nowrap;
}

.course-brand-mark {
  min-height: 1.7rem;
  display: inline-flex;
  align-items: center;
  border: 1px solid rgba(245, 184, 75, 0.48);
  border-radius: 0.32rem;
  padding: 0.2rem 0.48rem;
  background: rgba(245, 184, 75, 0.09);
  color: var(--course-gold-soft);
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.055em;
}

.course-brand-text {
  color: var(--course-soft);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.course-header-context {
  justify-self: center;
  min-width: 0;
  color: var(--course-soft);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  overflow: hidden;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.header-index-link,
.nav-toggle {
  min-height: 2.4rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--course-line);
  border-radius: 0.35rem;
  padding: 0.45rem 0.8rem;
  background: rgba(8, 27, 23, 0.72);
  color: var(--course-soft);
  font-size: 0.75rem;
  font-weight: 900;
  text-decoration: none;
}

.header-index-link:hover,
.nav-toggle:hover {
  border-color: var(--course-gold);
  color: var(--course-gold-soft);
}

.nav-toggle {
  display: none;
  cursor: pointer;
}

.nav-toggle-icon {
  width: 1rem;
  height: 0.7rem;
  display: grid;
  align-content: space-between;
  margin-right: 0.5rem;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after,
.nav-toggle-icon span {
  width: 100%;
  height: 0.1rem;
  display: block;
  content: "";
  background: currentColor;
}

.course-shell {
  min-height: calc(100vh - var(--header-height));
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
}

.lesson-sidebar {
  position: sticky;
  top: var(--header-height);
  height: calc(100vh - var(--header-height));
  align-self: start;
  border-right: 1px solid var(--course-line);
  background:
    linear-gradient(180deg, rgba(13, 37, 30, 0.92), rgba(3, 16, 13, 0.97)),
    var(--course-panel);
  overflow-y: auto;
  scrollbar-color: var(--course-green) transparent;
}

.sidebar-heading {
  position: sticky;
  z-index: 2;
  top: 0;
  padding: 1.35rem 1.15rem 1rem;
  border-bottom: 1px solid var(--course-line);
  background: rgba(7, 24, 19, 0.96);
}

.sidebar-kicker,
.hero-kicker,
.index-kicker,
.support-kicker {
  margin: 0;
  color: var(--course-gold);
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.sidebar-heading h2 {
  margin: 0.35rem 0 0;
  color: var(--course-ink);
  font-size: 1rem;
  line-height: 1.3;
}

.lesson-list {
  display: grid;
  gap: 0.15rem;
  margin: 0;
  padding: 0.75rem;
  list-style: none;
}

.lesson-list a {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: 0.65rem;
  align-items: start;
  padding: 0.68rem 0.65rem;
  border: 1px solid transparent;
  border-radius: 0.35rem;
  color: var(--course-muted);
  text-decoration: none;
}

.lesson-list a:hover {
  border-color: var(--course-line);
  background: rgba(255, 255, 255, 0.035);
  color: var(--course-ink);
}

.lesson-list a[aria-current="page"] {
  border-color: rgba(245, 184, 75, 0.38);
  background: linear-gradient(135deg, rgba(245, 184, 75, 0.12), rgba(116, 215, 255, 0.045));
  color: var(--course-ink);
  box-shadow: inset 0.18rem 0 0 var(--course-gold);
}

.lesson-list-number {
  color: var(--course-green);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 900;
}

.lesson-list a[aria-current="page"] .lesson-list-number {
  color: var(--course-gold);
}

.lesson-list-title {
  font-size: 0.78rem;
  font-weight: 750;
  line-height: 1.35;
}

.course-main {
  min-width: 0;
}

.lesson-hero,
.support-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-bottom: 1px solid var(--course-line);
  background:
    radial-gradient(circle at 82% 18%, rgba(116, 215, 255, 0.1), transparent 25rem),
    linear-gradient(145deg, rgba(13, 37, 30, 0.86), rgba(3, 16, 13, 0.98));
}

.lesson-hero::before,
.support-hero::before,
.index-hero::before {
  position: absolute;
  z-index: -2;
  inset: 0;
  content: "";
  opacity: 0.13;
  background-image:
    linear-gradient(rgba(116, 215, 255, 0.22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(116, 215, 255, 0.18) 1px, transparent 1px);
  background-size: 3.5rem 3.5rem;
  mask-image: linear-gradient(90deg, #000 0%, #000 38%, transparent 82%);
}

.lesson-hero::after,
.support-hero::after,
.index-hero::after {
  position: absolute;
  z-index: -1;
  right: -7rem;
  bottom: -9rem;
  width: 24rem;
  height: 24rem;
  border: 1px solid rgba(245, 184, 75, 0.15);
  border-radius: 50%;
  content: "";
  box-shadow: 0 0 0 4rem rgba(245, 184, 75, 0.025), 0 0 0 8rem rgba(116, 215, 255, 0.02);
}

.lesson-hero-inner,
.support-hero-inner,
.index-hero-inner {
  width: min(calc(100% - 3rem), var(--content-width));
  margin-inline: auto;
  padding: clamp(3rem, 7vw, 6.2rem) 0 clamp(2.6rem, 5vw, 4.5rem);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 1.25rem;
  color: var(--course-muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.breadcrumbs a {
  color: var(--course-soft);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--course-gold-soft);
}

.breadcrumbs span[aria-hidden="true"] {
  color: var(--course-gold);
}

.lesson-hero h1,
.support-hero h1,
.index-hero h1 {
  max-width: 15ch;
  margin: 0.5rem 0 0;
  color: var(--course-ink);
  font-family: var(--display);
  font-size: clamp(2.5rem, 6vw, 5.2rem);
  line-height: 0.98;
  text-wrap: balance;
}

.lesson-deck,
.support-deck,
.index-deck {
  max-width: 47rem;
  margin: 1.25rem 0 0;
  color: var(--course-soft);
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  line-height: 1.55;
}

.lesson-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.7rem;
}

.course-button {
  min-height: 2.7rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 0.38rem;
  padding: 0.55rem 0.9rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 900;
  text-decoration: none;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.course-button:hover {
  transform: translateY(-0.1rem);
}

.course-button-primary {
  background: var(--course-gold);
  color: #171006;
}

.course-button-primary:hover {
  background: var(--course-gold-soft);
}

.course-button-secondary {
  border-color: var(--course-line-strong);
  background: rgba(3, 16, 13, 0.62);
  color: var(--course-soft);
}

.course-button-secondary:hover {
  border-color: var(--course-cyan);
  color: var(--course-cyan);
}

.lesson-content,
.support-content {
  width: min(calc(100% - 3rem), var(--content-width));
  margin-inline: auto;
  padding: clamp(2rem, 5vw, 4.5rem) 0 5rem;
}

.lesson-article,
.support-article {
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  padding: clamp(1.25rem, 4vw, 4rem);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.28), transparent 14rem),
    var(--paper);
  color: var(--paper-ink);
  box-shadow: var(--shadow);
}

.lesson-article > :first-child,
.support-article > :first-child {
  margin-top: 0;
}

.lesson-article > :last-child,
.support-article > :last-child {
  margin-bottom: 0;
}

.lesson-article p,
.lesson-article li {
  max-width: none;
}

.support-article p,
.support-article li {
  max-width: 76ch;
}

.lesson-article p,
.support-article p {
  margin: 1rem 0;
}

.lesson-article h1,
.lesson-article h2,
.lesson-article h3,
.lesson-article h4,
.lesson-article h5,
.lesson-article h6 {
  max-width: none;
  color: #173f2e;
  font-family: var(--display);
  line-height: 1.15;
  text-wrap: balance;
}

.support-article h1,
.support-article h2,
.support-article h3,
.support-article h4,
.support-article h5,
.support-article h6 {
  max-width: 30ch;
  color: #173f2e;
  font-family: var(--display);
  line-height: 1.15;
  text-wrap: balance;
}

.lesson-article h2,
.support-article h2 {
  margin: 2.8rem 0 1rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--paper-line);
  font-size: clamp(1.8rem, 4vw, 2.65rem);
}

.lesson-article h3,
.support-article h3 {
  margin: 2.25rem 0 0.8rem;
  font-size: clamp(1.35rem, 3vw, 1.85rem);
}

.lesson-article h4,
.support-article h4 {
  margin: 1.8rem 0 0.65rem;
  font-size: 1.18rem;
}

.lesson-article a,
.support-article a {
  color: var(--paper-green);
  font-weight: 750;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

.lesson-article a:hover,
.support-article a:hover {
  color: #925e00;
}

.lesson-article ul,
.lesson-article ol,
.support-article ul,
.support-article ol {
  padding-left: 1.5rem;
}

.lesson-article li + li,
.support-article li + li {
  margin-top: 0.42rem;
}

.lesson-article hr,
.support-article hr {
  margin: 2.5rem 0;
  border: 0;
  border-top: 1px solid var(--paper-line);
}

.lesson-article img,
.support-article img {
  height: auto;
  border-radius: 0.35rem;
}

.lesson-article > p:first-child img,
.support-article > p:first-child img {
  max-height: 32rem;
  margin-inline: auto;
  border: 1px solid rgba(23, 63, 46, 0.2);
  box-shadow: 0 0.8rem 2.2rem rgba(31, 52, 42, 0.15);
  object-fit: contain;
}

.lesson-article code,
.support-article code {
  border-radius: 0.22rem;
  padding: 0.08rem 0.28rem;
  background: rgba(11, 107, 66, 0.09);
  color: #095d3a;
  font-size: 0.9em;
  overflow-wrap: anywhere;
}

.lesson-article pre,
.support-article pre {
  max-width: 100%;
  margin: 1.35rem 0;
  border: 1px solid rgba(120, 240, 178, 0.22);
  border-left: 0.28rem solid var(--course-green);
  border-radius: 0.45rem;
  padding: 1.15rem 1.25rem;
  background:
    linear-gradient(180deg, rgba(120, 240, 178, 0.035), transparent),
    var(--paper-code);
  color: var(--paper-code-ink);
  font-size: clamp(0.76rem, 1.7vw, 0.9rem);
  line-height: 1.6;
  overflow: auto;
  tab-size: 4;
  white-space: pre;
}

.lesson-article pre code,
.support-article pre code {
  display: block;
  min-width: max-content;
  padding: 0;
  background: transparent;
  color: inherit;
  font-size: inherit;
  overflow-wrap: normal;
}

.lesson-article kbd,
.support-article kbd {
  display: inline-block;
  min-width: 1.7em;
  border: 1px solid #aeb4af;
  border-bottom-width: 0.18rem;
  border-radius: 0.25rem;
  padding: 0.04rem 0.32rem;
  background: #e7e7e2;
  text-align: center;
  line-height: 1.4;
}

.lesson-article table,
.support-article table {
  width: 100% !important;
  max-width: 100%;
  display: block;
  margin: 1.4rem 0;
  border-collapse: collapse;
  overflow-x: auto;
  color: var(--paper-ink);
}

.lesson-article tbody,
.support-article tbody {
  width: 100%;
}

.lesson-article th,
.lesson-article td,
.support-article th,
.support-article td {
  border: 1px solid var(--paper-line);
  padding: 0.7rem 0.8rem;
  vertical-align: top;
}

.lesson-article th,
.support-article th {
  background: #e2e9e3;
  color: #153e2d;
  text-align: left;
}

.lesson-article table[role="presentation"],
.support-article table[role="presentation"] {
  border: 1px solid rgba(11, 107, 66, 0.24) !important;
  border-radius: 0.45rem !important;
  background: #e9f2ec !important;
}

.lesson-article table[role="presentation"] td,
.support-article table[role="presentation"] td {
  border: 0;
}

.lesson-article > table:first-of-type,
.support-article > table:first-of-type {
  border: 0;
  border-radius: 0.4rem;
  background: rgba(11, 107, 66, 0.055);
}

.lesson-article > table:first-of-type td,
.support-article > table:first-of-type td {
  border: 0;
}

.lesson-article blockquote,
.support-article blockquote {
  margin: 1.5rem 0;
  border-left: 0.25rem solid var(--course-gold);
  padding: 0.7rem 1.25rem;
  background: rgba(245, 184, 75, 0.08);
  color: #4b4332;
}

.lesson-article details,
.support-article details {
  margin: 1.2rem 0;
  border: 1px solid rgba(11, 107, 66, 0.22);
  border-radius: 0.45rem;
  padding: 0.85rem 1rem;
  background: rgba(255, 255, 255, 0.4);
}

.lesson-article summary,
.support-article summary {
  color: #174f36;
  cursor: pointer;
  font-weight: 850;
}

.lesson-article details[open] summary,
.support-article details[open] summary {
  margin-bottom: 0.75rem;
}

.lesson-pagination {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 0.8rem;
  align-items: stretch;
  margin-top: 1.5rem;
}

.pagination-link,
.pagination-index {
  min-height: 5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border: 1px solid var(--course-line);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  background: rgba(8, 27, 23, 0.78);
  color: var(--course-soft);
  text-decoration: none;
}

.pagination-link:hover,
.pagination-index:hover {
  border-color: var(--course-gold);
  color: var(--course-ink);
}

.pagination-link-next {
  align-items: flex-end;
  text-align: right;
}

.pagination-label {
  color: var(--course-gold);
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 900;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.pagination-title {
  margin-top: 0.25rem;
  font-size: 0.82rem;
  font-weight: 800;
  line-height: 1.35;
}

.pagination-index {
  align-items: center;
  min-width: 5.4rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 900;
  text-transform: uppercase;
}

.course-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.75rem clamp(1rem, 3vw, 2.75rem);
  border-top: 1px solid var(--course-line);
  background: var(--course-bg-deep);
  color: var(--course-muted);
  font-size: 0.78rem;
}

.course-footer p {
  margin: 0;
}

.course-footer-primary {
  display: grid;
  gap: 0.65rem;
}

.course-footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 1rem;
}

.course-footer-company {
  flex: 1 0 100%;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 0.9rem;
  line-height: 1.6;
}

.course-footer a {
  color: var(--course-soft);
  font-weight: 800;
  text-decoration: none;
}

.course-footer a:hover {
  color: var(--course-gold-soft);
}

.course-footer a[aria-current="page"] {
  color: var(--course-gold-soft);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.policy-updated {
  border-left: 0.25rem solid var(--paper-green);
  padding: 0.55rem 0.9rem;
  background: rgba(11, 107, 66, 0.07);
}

.glossary-term {
  scroll-margin-top: calc(var(--header-height) + 1.25rem);
  border-radius: 0.18em;
  padding: 0 0.08em;
  background: rgba(11, 107, 66, 0.09);
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
  color: inherit !important;
  text-decoration-line: underline !important;
  text-decoration-style: dotted !important;
  text-decoration-color: var(--course-green) !important;
  text-decoration-thickness: 0.11em !important;
  text-underline-offset: 0.19em;
}

.glossary-term::after {
  content: "?";
  margin-left: 0.08em;
  color: #0b6b42;
  font-family: var(--mono);
  font-size: 0.62em;
  font-weight: 900;
  vertical-align: super;
}

.glossary-term:hover,
.glossary-term:focus-visible {
  background: rgba(245, 184, 75, 0.2);
  color: #173b2b !important;
  text-decoration-color: #a56600 !important;
}

.glossary-course-link {
  white-space: nowrap;
}

.lesson-glossary-panel {
  margin: 0 0 1.5rem !important;
  border-color: rgba(245, 184, 75, 0.34) !important;
  background: linear-gradient(145deg, rgba(245, 184, 75, 0.09), rgba(11, 107, 66, 0.08)) !important;
}

.lesson-glossary-panel summary {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.45rem 1rem;
  color: #173b2b !important;
}

.lesson-glossary-panel summary span {
  color: #63736b;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.035em;
  text-transform: uppercase;
}

.lesson-glossary-panel > p {
  margin: 0.75rem 0 !important;
  color: #52645a;
  font-size: 0.86rem;
}

.lesson-glossary-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.42rem;
}

.glossary-chip {
  scroll-margin-top: calc(var(--header-height) + 1.25rem);
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
  border: 1px solid rgba(11, 107, 66, 0.26);
  border-radius: 999px;
  padding: 0.32rem 0.65rem;
  background: rgba(255, 255, 255, 0.62);
  color: #185237 !important;
  font-family: var(--mono);
  font-size: 0.69rem;
  font-weight: 850;
  line-height: 1.25;
  text-decoration: none !important;
}

.glossary-chip:hover,
.glossary-chip:focus-visible {
  border-color: #a56600;
  background: rgba(245, 184, 75, 0.22);
  color: #173b2b !important;
}

.index-hero-actions {
  margin: 1.5rem 0 0;
}

.glossary-hero {
  border-bottom: 1px solid var(--course-line);
  background:
    radial-gradient(circle at 82% 18%, rgba(116, 215, 255, 0.1), transparent 25rem),
    linear-gradient(145deg, #0a211b, #03100d 70%);
}

.glossary-hero-inner {
  width: min(calc(100% - 3rem), var(--content-width));
  margin-inline: auto;
  padding: clamp(3rem, 7vw, 5.5rem) 0;
}

.glossary-hero h1 {
  max-width: 13ch;
  margin: 0.75rem 0 0;
  color: var(--course-ink);
  font-family: var(--display);
  font-size: clamp(3rem, 7vw, 6.6rem);
  line-height: 0.95;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.glossary-deck {
  max-width: 45rem;
  margin: 1.25rem 0 0;
  color: var(--course-muted);
  font-size: clamp(1rem, 1.7vw, 1.2rem);
  line-height: 1.7;
}

.glossary-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.75rem;
}

.glossary-layout {
  width: min(calc(100% - 3rem), var(--content-width));
  display: grid;
  grid-template-columns: minmax(14rem, 18rem) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
  margin-inline: auto;
  padding: clamp(2.5rem, 6vw, 5rem) 0;
}

.glossary-tools {
  position: sticky;
  top: calc(var(--header-height) + 1.25rem);
  border: 1px solid var(--course-line);
  border-radius: var(--radius);
  padding: 1.15rem;
  background: linear-gradient(150deg, rgba(13, 37, 30, 0.94), rgba(5, 19, 15, 0.97));
  box-shadow: var(--shadow);
}

.glossary-tools label {
  display: block;
  margin-bottom: 0.55rem;
  color: var(--course-soft);
  font-size: 0.78rem;
  font-weight: 900;
}

.glossary-tools input {
  width: 100%;
  min-height: 2.9rem;
  border: 1px solid rgba(214, 226, 219, 0.28);
  border-radius: 0.35rem;
  padding: 0.7rem 0.78rem;
  background: rgba(3, 16, 13, 0.82);
  color: var(--course-ink);
  font: inherit;
}

.glossary-tools input:focus {
  border-color: var(--course-gold);
  outline: 0.16rem solid rgba(245, 184, 75, 0.22);
}

.glossary-tools > p {
  margin: 0.7rem 0 0;
  color: var(--course-muted);
  font-size: 0.73rem;
}

.glossary-alphabet {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 1.1rem;
}

.glossary-alphabet a {
  min-width: 1.95rem;
  min-height: 1.95rem;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--course-line);
  border-radius: 0.25rem;
  color: var(--course-gold-soft);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 900;
  text-decoration: none;
}

.glossary-alphabet a:hover,
.glossary-alphabet a:focus-visible {
  border-color: var(--course-gold);
  background: rgba(245, 184, 75, 0.12);
  color: var(--course-ink);
}

.glossary-letter-group {
  scroll-margin-top: calc(var(--header-height) + 1rem);
}

.glossary-letter-group + .glossary-letter-group {
  margin-top: 3.5rem;
}

.glossary-letter {
  margin: 0 0 0.8rem;
  border-bottom: 1px solid var(--course-line);
  padding-bottom: 0.5rem;
  color: var(--course-gold);
  font-family: var(--display);
  font-size: clamp(2rem, 4vw, 3rem);
}

.glossary-entry-list {
  display: grid;
  gap: 0.7rem;
}

.glossary-entry {
  scroll-margin-top: calc(var(--header-height) + 1.2rem);
  border: 1px solid var(--course-line);
  border-radius: var(--radius);
  padding: clamp(1rem, 2.5vw, 1.4rem);
  background: linear-gradient(150deg, rgba(13, 37, 30, 0.82), rgba(5, 19, 15, 0.9));
  color: var(--course-muted);
  transition: border-color 0.18s ease, background 0.18s ease, box-shadow 0.18s ease;
}

.glossary-entry:target {
  border-color: var(--course-gold);
  background: linear-gradient(150deg, rgba(50, 60, 37, 0.94), rgba(8, 28, 21, 0.96));
  box-shadow: 0 0 0 0.22rem rgba(245, 184, 75, 0.14), var(--shadow);
}

.glossary-entry h3 {
  margin: 0;
  color: var(--course-ink);
  font-family: var(--display);
  font-size: clamp(1.35rem, 2.5vw, 1.8rem);
}

.glossary-entry p {
  margin: 0.65rem 0 0;
  line-height: 1.68;
}

.glossary-aliases {
  color: #9fb2a9;
  font-size: 0.82rem;
}

.glossary-used-in {
  font-size: 0.82rem;
}

.glossary-used-in a,
.glossary-entry-return {
  color: var(--course-gold-soft);
  font-weight: 800;
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.glossary-entry-return {
  display: inline-block;
  margin-top: 0.85rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  text-transform: uppercase;
}

.glossary-empty {
  border: 1px dashed var(--course-line);
  border-radius: var(--radius);
  padding: 2rem;
  color: var(--course-muted);
  text-align: center;
}

.glossary-entry[hidden],
.glossary-letter-group[hidden],
.glossary-empty[hidden] {
  display: none !important;
}

.index-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  min-height: min(42rem, calc(100vh - var(--header-height)));
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--course-line);
  background:
    radial-gradient(circle at 80% 20%, rgba(116, 215, 255, 0.11), transparent 26rem),
    linear-gradient(145deg, #0a211b, #03100d 68%);
}

.index-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 22rem);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: end;
}

.index-hero h1 {
  max-width: 13ch;
}

.index-summary {
  border: 1px solid rgba(245, 184, 75, 0.3);
  border-radius: var(--radius);
  padding: 1.4rem;
  background: linear-gradient(160deg, rgba(8, 27, 23, 0.88), rgba(3, 16, 13, 0.7));
  box-shadow: var(--shadow);
}

.index-summary-label {
  color: var(--course-gold);
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 900;
  text-transform: uppercase;
}

.index-summary strong {
  display: block;
  margin-top: 0.4rem;
  color: var(--course-ink);
  font-family: var(--display);
  font-size: 3rem;
  line-height: 1;
}

.index-summary p {
  margin: 0.7rem 0 0;
  color: var(--course-muted);
}

.course-declaration {
  position: relative;
  grid-column: 1 / -1;
  overflow: hidden;
  border: 1px solid rgba(245, 184, 75, 0.5);
  border-left: 0.38rem solid var(--course-gold);
  border-radius: var(--radius);
  padding: clamp(1.35rem, 2.8vw, 2rem);
  background:
    linear-gradient(120deg, rgba(245, 184, 75, 0.11), transparent 48%),
    rgba(3, 16, 13, 0.82);
  box-shadow: 0 1.2rem 3.2rem rgba(0, 0, 0, 0.28);
}

.course-declaration::after {
  position: absolute;
  right: -4rem;
  bottom: -6rem;
  width: 15rem;
  height: 15rem;
  border: 1px solid rgba(116, 215, 255, 0.15);
  border-radius: 50%;
  content: "";
  box-shadow: 0 0 0 3rem rgba(116, 215, 255, 0.025);
  pointer-events: none;
}

.course-declaration-label {
  margin: 0 0 1rem;
  color: var(--course-gold);
  font-family: var(--mono);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.course-declaration .course-declaration-copy {
  margin: 0;
  border: 0;
  padding: 0;
}

.course-declaration .course-declaration-copy p {
  width: 100%;
  margin: 0;
  color: #f7f2df;
  font-family: var(--display);
  font-size: clamp(1.45rem, 2.6vw, 2.45rem);
  font-weight: 700;
  line-height: 1.15;
  text-wrap: pretty;
}

.course-declaration cite {
  display: block;
  margin-top: 1.25rem;
  color: var(--course-cyan-soft);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-style: normal;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.index-main {
  width: min(calc(100% - 3rem), 78rem);
  margin-inline: auto;
  padding: clamp(3rem, 7vw, 6rem) 0;
}

.lesson-group + .lesson-group {
  margin-top: 5rem;
}

.group-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 0.7fr);
  gap: 2rem;
  align-items: end;
  margin-bottom: 1.8rem;
}

.group-heading h2 {
  max-width: 18ch;
  margin: 0.45rem 0 0;
  color: var(--course-ink);
  font-family: var(--display);
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  line-height: 1.04;
}

.group-heading p {
  margin: 0;
  color: var(--course-muted);
}

.lesson-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
}

.lesson-card {
  min-height: 14rem;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--course-line);
  border-radius: var(--radius);
  padding: 1.25rem;
  background: linear-gradient(150deg, rgba(13, 37, 30, 0.82), rgba(5, 19, 15, 0.9));
  color: var(--course-soft);
  text-decoration: none;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.lesson-card:hover {
  transform: translateY(-0.2rem);
  border-color: var(--course-gold);
  background: linear-gradient(150deg, rgba(35, 63, 51, 0.88), rgba(7, 23, 18, 0.94));
}

.lesson-card-number {
  color: var(--course-gold);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.lesson-card h3 {
  margin: 1.8rem 0 0.6rem;
  color: var(--course-ink);
  font-size: 1.15rem;
  line-height: 1.25;
  text-wrap: balance;
}

.lesson-card p {
  margin: 0;
  color: var(--course-muted);
  font-size: 0.86rem;
  line-height: 1.5;
}

.lesson-card-cta {
  margin-top: auto;
  padding-top: 1.25rem;
  color: var(--course-green);
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 900;
  text-transform: uppercase;
}

.support-layout {
  min-height: calc(100vh - var(--header-height));
}

.support-hero h1 {
  max-width: 18ch;
  font-size: clamp(2.3rem, 5vw, 4.5rem);
}

.nav-scrim {
  display: none;
}

@media (max-width: 74rem) {
  :root {
    --sidebar-width: 17rem;
  }

  .lesson-card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 58rem) {
  .course-header {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .course-header-context,
  .header-index-link {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .course-shell {
    display: block;
  }

  .lesson-sidebar {
    position: fixed;
    z-index: 1900;
    top: var(--header-height);
    bottom: 0;
    left: 0;
    width: min(88vw, 21rem);
    height: auto;
    transform: translateX(-105%);
    transition: transform 0.22s ease;
    box-shadow: var(--shadow);
  }

  body.nav-open .lesson-sidebar {
    transform: none;
  }

  .nav-scrim {
    position: fixed;
    z-index: 1800;
    inset: var(--header-height) 0 0;
    display: block;
    border: 0;
    padding: 0;
    background: rgba(1, 7, 5, 0.7);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.22s ease;
  }

  .nav-scrim[hidden] {
    display: none;
  }

  body.nav-open .nav-scrim {
    opacity: 1;
    pointer-events: auto;
  }

  .index-hero-inner,
  .group-heading {
    grid-template-columns: 1fr;
  }

  .index-summary {
    max-width: 30rem;
  }

  .glossary-layout {
    grid-template-columns: 1fr;
  }

  .glossary-tools {
    position: static;
  }
}

@media (max-width: 42rem) {
  :root {
    --header-height: 4rem;
  }

  body.course-page {
    font-size: 0.96rem;
  }

  .course-header {
    padding-inline: 0.85rem;
  }

  .course-brand-text {
    display: none;
  }

  .nav-toggle-label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .nav-toggle-icon {
    margin: 0;
  }

  .lesson-hero-inner,
  .support-hero-inner,
  .glossary-hero-inner,
  .index-hero-inner,
  .lesson-content,
  .support-content,
  .glossary-layout,
  .index-main {
    width: min(calc(100% - 1.4rem), var(--content-width));
  }

  .lesson-hero h1,
  .support-hero h1,
  .glossary-hero h1,
  .index-hero h1 {
    font-size: clamp(2.15rem, 11vw, 3.35rem);
  }

  .lesson-article,
  .support-article {
    border-radius: 0.4rem;
    padding: 1.05rem;
  }

  .lesson-article table,
  .support-article table {
    font-size: 0.82rem;
  }

  .lesson-article th,
  .lesson-article td,
  .support-article th,
  .support-article td {
    padding: 0.55rem;
  }

  .lesson-card-grid,
  .lesson-pagination {
    grid-template-columns: 1fr;
  }

  .lesson-card {
    min-height: 12.5rem;
  }

  .pagination-index {
    order: -1;
    min-height: 3.2rem;
  }

  .pagination-link-next {
    align-items: flex-start;
    text-align: left;
  }

  .course-footer {
    flex-direction: column;
  }

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

.lesson-enhancement {
  margin-top: clamp(2rem, 4vw, 3rem);
  padding-top: clamp(1.5rem, 3vw, 2.25rem);
  border-top: 0.22rem solid rgba(var(--lesson-accent-rgb, 15, 111, 78), 0.62);
}

.lesson-enhancement-kicker {
  margin-bottom: 0.65rem;
  color: var(--paper-green);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.lesson-enhancement > h2 {
  margin-top: 0;
}

.architecture-cycle {
  padding: 1rem 1.15rem;
  border-left: 0.3rem solid var(--paper-green);
  background: rgba(var(--lesson-accent-rgb, 15, 111, 78), 0.09);
  color: #163d2f;
  font-size: clamp(1rem, 2vw, 1.16rem);
  line-height: 1.7;
}

@media print {
  :root {
    color-scheme: light;
  }

  body.course-page {
    background: white;
    color: black;
  }

  body.course-page::before,
  .reading-progress,
  .course-header,
  .lesson-sidebar,
  .lesson-hero-actions,
  .lesson-pagination,
  .course-footer,
  .nav-scrim {
    display: none !important;
  }

  .course-shell {
    display: block;
  }

  .lesson-hero,
  .support-hero {
    border: 0;
    background: white;
  }

  .lesson-hero h1,
  .support-hero h1,
  .hero-kicker,
  .support-kicker,
  .breadcrumbs,
  .lesson-deck,
  .support-deck {
    color: black;
  }

  .lesson-hero-inner,
  .support-hero-inner,
  .lesson-content,
  .support-content {
    width: 100%;
    padding: 1rem 0;
  }

  .lesson-article,
  .support-article {
    border: 0;
    padding: 0;
    background: white;
    box-shadow: none;
  }

  .lesson-article pre,
  .support-article pre {
    border-color: #777;
    background: #f4f4f4;
    color: black;
    white-space: pre-wrap;
  }

  .glossary-term {
    background: transparent;
    text-decoration: none !important;
  }

  .glossary-term::after,
  .lesson-glossary-panel,
  .glossary-tools,
  .glossary-entry-return {
    display: none !important;
  }
}