:root {
  --ink: #17212b;
  --muted: #5f6b76;
  --paper: #fffaf2;
  --surface: #ffffff;
  --surface-soft: #fbfdf9;
  --line: #d9ded8;
  --teal: #1f7a76;
  --teal-dark: #12534f;
  --blue: #2f5f98;
  --gold: #d79a2b;
  --coral: #c95d45;
  --sage: #e7efe8;
  --shadow: 0 16px 36px rgba(21, 39, 45, 0.1);
  --shadow-soft: 0 8px 20px rgba(21, 39, 45, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: auto;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 18px;
  line-height: 1.55;
  overflow-x: hidden;
  overflow-wrap: break-word;
}

a {
  color: inherit;
}

img {
  max-width: 100%;
}

:focus-visible {
  outline: 3px solid rgba(31, 122, 118, 0.32);
  outline-offset: 3px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 56px);
  background: rgba(255, 250, 242, 0.95);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  font-weight: 800;
  line-height: 1.1;
  text-decoration: none;
}

.brand span:last-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 8px;
  color: white;
  background: var(--teal);
  box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.12);
}

.top-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.top-nav a {
  padding: 10px 12px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  transition: color 180ms ease, background 180ms ease;
}

.top-nav a:hover,
.top-nav a:focus-visible {
  color: var(--teal-dark);
  background: var(--sage);
}

.hero {
  position: relative;
  display: grid;
  min-height: min(720px, calc(100vh - 74px));
  overflow: hidden;
  background: #24352f;
}

.hero img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(11, 24, 27, 0.84), rgba(11, 24, 27, 0.52) 48%, rgba(11, 24, 27, 0.12)),
    linear-gradient(0deg, rgba(11, 24, 27, 0.28), rgba(11, 24, 27, 0));
}

.hero-overlay {
  position: relative;
  z-index: 1;
  align-self: center;
  width: min(720px, calc(100% - 36px));
  margin-left: clamp(18px, 6vw, 80px);
  padding: 52px 0 88px;
  color: white;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--gold);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.05;
  letter-spacing: 0;
}

h1 {
  max-width: 760px;
  font-size: clamp(2.35rem, 5.6vw, 4.9rem);
}

h2 {
  font-size: clamp(1.95rem, 3.6vw, 3.15rem);
}

h3 {
  font-size: 1.45rem;
}

.hero p:not(.eyebrow) {
  max-width: 560px;
  margin: 24px 0 0;
  font-size: clamp(1.05rem, 2vw, 1.2rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 13px 20px;
  border: 0;
  border-radius: 8px;
  font: inherit;
  font-weight: 800;
  line-height: 1.15;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: background 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.primary-button:hover,
.secondary-button:hover {
  transform: translateY(-1px);
}

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

.primary-button:hover,
.primary-button:focus-visible {
  background: var(--teal-dark);
}

.secondary-button {
  color: white;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.secondary-button:hover,
.secondary-button:focus-visible {
  background: rgba(255, 255, 255, 0.25);
}

.full {
  width: 100%;
}

.intro-band {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-bottom: 1px solid var(--line);
}

.intro-band div {
  min-height: 128px;
  padding: 24px clamp(18px, 3vw, 34px);
  background: var(--surface);
}

.intro-band strong,
.intro-band span {
  display: block;
}

.intro-band strong {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  line-height: 1.18;
}

.intro-band span {
  color: var(--muted);
}

.section-shell {
  padding: clamp(48px, 7vw, 78px) clamp(18px, 5vw, 72px);
}

.section-heading {
  max-width: 820px;
  margin-bottom: 28px;
}

.section-heading p:not(.eyebrow),
.media-section p {
  color: var(--muted);
}

.section-heading p:not(.eyebrow) {
  max-width: 720px;
  margin-top: 12px;
}

.compact {
  margin-bottom: 22px;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  padding: 8px 0 24px;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: 18px;
  margin-bottom: 22px;
}

.course-card {
  display: grid;
  grid-template-rows: auto auto auto 1fr auto;
  gap: 11px;
  overflow: hidden;
  min-height: 100%;
  padding: 0 0 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: var(--surface);
  font: inherit;
  text-align: left;
  text-decoration: none;
  box-shadow: var(--shadow-soft);
  cursor: pointer;
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.course-page-main {
  padding: 34px clamp(18px, 5vw, 72px) 72px;
}

.course-page-main > .eyebrow,
.course-page-main > h1 {
  text-align: center;
}

.course-page-main > h1 {
  margin-bottom: 28px;
  font-size: clamp(2.2rem, 5vw, 4.8rem);
}

.course-card img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  height: auto;
  object-fit: cover;
}

.course-card span,
.course-card strong,
.course-card p {
  margin-right: 16px;
  margin-left: 16px;
}

.course-card span {
  width: fit-content;
  padding: 5px 9px;
  border-radius: 999px;
  color: var(--teal-dark);
  background: var(--sage);
  font-size: 0.85rem;
  font-weight: 800;
}

.course-card strong {
  padding: 12px;
  border-left: 4px solid var(--teal);
  border-radius: 4px;
  color: var(--ink);
  background: var(--sage);
  font-weight: 900;
  font-size: 1.15rem;
  line-height: 1.18;
  overflow-wrap: break-word;
}

.course-card p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.course-card:hover,
.course-card:focus-visible,
.course-card.active {
  border-color: var(--teal);
  outline: 3px solid rgba(31, 122, 118, 0.16);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.course-suggestions {
  max-width: 1180px;
  margin: 42px auto 0;
}

.suggested-course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
  gap: 16px;
}

.tab-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex: 0 0 auto;
  min-height: 48px;
  padding: 11px 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: var(--surface);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  transition: color 180ms ease, background 180ms ease, border-color 180ms ease;
}

.tab-button.active {
  color: white;
  border-color: var(--teal);
  background: var(--teal);
}

.tab-count {
  display: inline-grid;
  place-items: center;
  min-width: 26px;
  height: 26px;
  padding: 0 8px;
  border-radius: 999px;
  color: var(--teal-dark);
  background: var(--sage);
  font-size: 0.82rem;
  line-height: 1;
}

.tab-button.active .tab-count {
  color: var(--teal-dark);
  background: white;
}

.course-workspace {
  display: grid;
  grid-template-columns: minmax(230px, 300px) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.basic-template-shell {
  display: grid;
  grid-template-columns: minmax(240px, 300px) minmax(0, 1fr);
  min-height: min(780px, calc(100vh - 118px));
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.basic-template-shell.summary-is-collapsed {
  grid-template-columns: 96px minmax(0, 1fr);
}

.basic-template-summary {
  display: grid;
  grid-template-rows: auto 1fr;
  border-right: 1px solid var(--line);
  background: var(--surface-soft);
}

.basic-template-summary.collapsed {
  grid-template-rows: auto;
}

.basic-template-summary.collapsed .basic-summary-content {
  display: none;
}

.basic-template-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 14px;
}

.basic-back,
.basic-menu {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  background: white;
  font: inherit;
  font-weight: 900;
  cursor: pointer;
}

.basic-back {
  border-color: transparent;
  background: transparent;
  font-size: 1.35rem;
  text-decoration: none;
}

.basic-menu {
  display: inline-flex;
  width: auto;
  min-width: 44px;
  max-width: 100%;
  gap: 8px;
  padding: 8px 10px;
  border-color: var(--teal);
  color: white;
  background: var(--teal);
  font-size: 0.92rem;
  line-height: 1;
  white-space: nowrap;
}

.basic-menu:hover,
.basic-menu:focus-visible {
  background: var(--teal-dark);
}

.basic-template-summary.collapsed .basic-template-controls {
  justify-content: center;
}

.basic-template-summary.collapsed .basic-back,
.basic-template-summary.collapsed .menu-label {
  display: none;
}

.menu-icon {
  display: grid;
  gap: 4px;
}

.menu-icon span {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
}

.basic-summary-content {
  padding: 16px;
}

.basic-summary-content h3 {
  margin-bottom: 18px;
  font-size: clamp(1.65rem, 3vw, 2.2rem);
  text-transform: none;
}

.basic-summary-content ol {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.basic-summary-content a {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  padding: 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--ink);
  font-weight: 800;
  line-height: 1.2;
  text-decoration: none;
  overflow-wrap: break-word;
  transition: background 180ms ease, border-color 180ms ease;
}

.basic-summary-content a:hover,
.basic-summary-content a:focus-visible,
.basic-summary-content a.active {
  border-color: var(--teal);
  background: var(--sage);
}

.basic-summary-content span {
  color: var(--coral);
  font-size: 0.9rem;
}

.basic-template-content {
  max-height: min(780px, calc(100vh - 118px));
  overflow-y: auto;
  padding: clamp(22px, 4vw, 42px) clamp(20px, 5vw, 64px) 64px;
  overflow-anchor: none;
  scroll-behavior: auto;
}

.basic-title-block {
  max-width: 780px;
  margin: 0 auto 28px;
  text-align: center;
}

.basic-title-block span {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--coral);
  font-weight: 800;
}

.basic-title-block h1 {
  color: var(--teal-dark);
  font-weight: 900;
  font-size: clamp(1.9rem, 4.4vw, 3.45rem);
}

.basic-title-block p {
  color: var(--muted);
}

.basic-intro-card,
.basic-topic {
  max-width: 980px;
  margin: 0 auto 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.basic-intro-card {
  display: grid;
  grid-template-columns: minmax(260px, 0.95fr) minmax(0, 1.05fr);
  gap: 0;
  align-items: stretch;
}

.basic-intro-card > div {
  align-self: center;
  padding: clamp(22px, 4vw, 34px);
}

.basic-intro-card h3 {
  font-size: clamp(1.55rem, 3vw, 2.15rem);
}

.basic-intro-card img,
.topic-body img {
  width: 100%;
  height: 100%;
  min-height: 210px;
  border-radius: 0;
}

.basic-intro-card img {
  object-fit: cover;
}

.topic-body img {
  object-fit: contain;
  background: #e7efe8;
}

.basic-topic {
  scroll-margin-top: 24px;
  overflow-anchor: none;
}

.topic-toggle {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  width: 100%;
  min-height: 72px;
  padding: 18px clamp(18px, 4vw, 28px);
  border: 0;
  color: var(--ink);
  background: white;
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background 180ms ease;
}

.topic-toggle span {
  color: var(--coral);
  font-size: 0.82rem;
  font-weight: 900;
  text-transform: uppercase;
}

.topic-toggle strong {
  font-size: 1.35rem;
  line-height: 1.15;
  overflow-wrap: break-word;
}

.topic-toggle em {
  color: var(--teal-dark);
  font-style: normal;
  font-weight: 900;
}

.topic-toggle:hover,
.topic-toggle:focus-visible {
  background: var(--sage);
}

.topic-body {
  display: none;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 34%);
  gap: 22px;
  align-items: stretch;
  overflow: hidden;
  padding: 0 clamp(18px, 4vw, 28px);
}

.basic-topic.open .topic-body {
  display: grid;
  padding-bottom: clamp(20px, 4vw, 32px);
}

.lesson-block {
  margin-top: 18px;
}

.lesson-block h4 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 1.05rem;
}

.lesson-list {
  display: grid;
  gap: 9px;
  margin: 0;
  padding-left: 22px;
  color: var(--muted);
}

.lesson-list li::marker {
  color: var(--coral);
  font-weight: 900;
}

.lesson-alert {
  margin-top: 18px;
  padding: 14px;
  border-left: 4px solid var(--coral);
  border-radius: 8px;
  color: var(--ink);
  background: #fff4ee;
}

.topic-body p,
.basic-intro-card p {
  color: var(--muted);
}

.course-sidebar {
  position: sticky;
  top: 96px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.summary-toggle {
  width: 100%;
  min-height: 48px;
  padding: 12px 16px;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 8px 8px 0 0;
  color: white;
  background: var(--teal);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.summary-content {
  padding: 20px;
}

.course-sidebar.collapsed {
  width: 100%;
}

.course-sidebar.collapsed .summary-content {
  display: none;
}

.summary-tree {
  display: grid;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.summary-tree a {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: var(--surface-soft);
  font-weight: 800;
  line-height: 1.25;
  text-decoration: none;
}

.summary-tree a:hover,
.summary-tree a:focus-visible {
  border-color: var(--teal);
  background: var(--sage);
}

.summary-tree span {
  color: var(--coral);
  font-size: 0.85rem;
}

.course-article {
  display: grid;
  gap: 18px;
}

.course-hero-card,
.course-outcomes,
.topic-section {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.course-hero-card,
.course-outcomes {
  padding: clamp(22px, 4vw, 34px);
}

.course-hero-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 34%);
  gap: 22px;
  align-items: stretch;
}

.course-hero-card img {
  width: 100%;
  height: 100%;
  min-height: 230px;
  object-fit: cover;
  border-radius: 8px;
}

.course-hero-card p,
.topic-section p,
.course-outcomes li {
  color: var(--muted);
}

.course-outcomes ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.course-outcomes li {
  padding-left: 16px;
  border-left: 4px solid var(--gold);
}

.topic-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 34%);
  gap: 22px;
  align-items: stretch;
  padding: clamp(22px, 4vw, 34px);
  scroll-margin-top: 96px;
}

.topic-section img {
  width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: cover;
  border-radius: 8px;
}

.module-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.module-meta span,
.pill {
  padding: 7px 10px;
  border-radius: 999px;
  color: var(--teal-dark);
  background: var(--sage);
  font-size: 0.9rem;
  font-weight: 800;
}

.muted {
  background: #f3f6f0;
}

.site-footer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: start;
  padding: 38px clamp(18px, 5vw, 72px);
  color: white;
  background: #0b2427;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: white;
  font-weight: 900;
  text-decoration: none;
}

.site-footer p {
  max-width: 620px;
  margin: 14px 0 0;
  color: rgba(255, 255, 255, 0.72);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.footer-links a {
  padding: 10px 12px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  color: white;
  font-weight: 800;
  text-decoration: none;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  background: rgba(255, 255, 255, 0.12);
}

@media (max-width: 920px) {
  .site-header {
    align-items: center;
    flex-direction: row;
    flex-wrap: wrap;
  }

  .top-nav {
    justify-content: flex-end;
  }

  .intro-band,
  .course-grid,
  .course-workspace,
  .basic-template-shell,
  .site-footer {
    grid-template-columns: 1fr;
  }

  .basic-template-shell.summary-is-collapsed {
    grid-template-columns: 1fr;
  }

  .basic-template-summary {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .basic-template-summary.collapsed .basic-template-controls {
    justify-content: space-between;
  }

  .basic-template-summary.collapsed .basic-back,
  .basic-template-summary.collapsed .menu-label {
    display: inline-grid;
  }

  .basic-template-content {
    max-height: none;
    overflow: visible;
  }

  .course-sidebar {
    position: static;
  }

  .course-hero-card,
  .topic-section,
  .basic-intro-card,
  .topic-body,
  .suggested-course-grid,
  .course-outcomes ul {
    grid-template-columns: 1fr;
  }

  .footer-links {
    justify-content: flex-start;
  }
}

@media (max-width: 620px) {
  body {
    font-size: 17px;
  }

  .site-header {
    gap: 12px;
    padding: 12px 16px;
  }

  .brand {
    width: 100%;
  }

  .brand-mark {
    width: 42px;
    height: 42px;
  }

  .top-nav {
    width: 100%;
    justify-content: stretch;
  }

  .top-nav a {
    flex: 1 1 0;
    text-align: center;
  }

  .hero {
    min-height: 610px;
  }

  .hero::after {
    background: linear-gradient(180deg, rgba(15, 26, 28, 0.75), rgba(15, 26, 28, 0.46));
  }

  .hero-overlay {
    align-self: end;
    width: calc(100% - 32px);
    margin: 0 auto;
    padding: 72px 0 54px;
  }

  h1 {
    font-size: clamp(2.15rem, 13vw, 3.3rem);
  }

  h2 {
    font-size: clamp(1.8rem, 10vw, 2.5rem);
  }

  .intro-band,
  .course-grid {
    grid-template-columns: 1fr;
  }

  .intro-band div {
    min-height: auto;
  }

  .tabs {
    display: grid;
    grid-template-columns: 1fr;
  }

  .tab-button {
    width: 100%;
  }

  .course-page-main {
    padding: 18px 12px 48px;
  }

  .basic-template-shell {
    border-width: 1px;
    border-radius: 10px;
    box-shadow: none;
  }

  .basic-template-controls {
    padding: 10px;
  }

  .basic-summary-content {
    padding: 14px;
  }

  .basic-template-content {
    padding: 20px 14px 40px;
  }

  .basic-title-block {
    text-align: left;
  }

  .basic-intro-card {
    grid-template-columns: 1fr;
  }

  .basic-intro-card img {
    min-height: 180px;
  }

  .primary-button,
  .secondary-button {
    width: 100%;
  }

  .topic-toggle {
    grid-template-columns: 1fr auto;
    gap: 8px 12px;
    padding: 16px;
  }

  .topic-toggle span {
    grid-column: 1 / -1;
  }

  .topic-toggle strong {
    font-size: 1.18rem;
  }

  .topic-toggle em {
    font-size: 0.9rem;
  }

  .topic-body {
    padding-right: 16px;
    padding-left: 16px;
  }

  .basic-topic.open .topic-body {
    grid-template-columns: 1fr;
  }

  .topic-body img {
    min-height: 170px;
  }
}