:root {
  color-scheme: dark;
  --bg: #090b0f;
  --panel: #10141b;
  --panel-2: #151a23;
  --ink: #f5f0e8;
  --muted: #aab1bd;
  --line: #2a3140;
  --accent: #54d6c7;
  --accent-2: #ff5b4f;
  --accent-3: #f3c969;
  --accent-rgb: 84, 214, 199;
  --accent-2-rgb: 255, 91, 79;
  --accent-ink: #06100f;
  --code: #0d1117;
  --year-route: "/pva/year";
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(118deg, rgba(var(--accent-rgb), 0.14), transparent 34%),
    linear-gradient(242deg, rgba(var(--accent-2-rgb), 0.11), transparent 38%),
    repeating-linear-gradient(90deg, rgba(245, 240, 232, 0.055) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(245, 240, 232, 0.04) 0 1px, transparent 1px 72px),
    var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

a {
  color: inherit;
}

code {
  padding: 0.08em 0.28em;
  border: 1px solid rgba(245, 240, 232, 0.16);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--accent-3);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.88em;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 20;
  transform: translateY(-140%);
  padding: 8px 10px;
  border-radius: 6px;
  background: var(--accent-3);
  color: #090b0f;
  font-weight: 800;
}

.skip-link:focus {
  transform: translateY(0);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 56px);
  border-bottom: 1px solid var(--line);
  background: rgba(9, 11, 15, 0.92);
  backdrop-filter: blur(14px);
}

.brand {
  font-weight: 780;
}

nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0;
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 14px;
}

nav::before {
  content: var(--year-route);
  margin-right: 0.25rem;
  color: var(--accent);
  font-weight: 760;
}

nav a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 0.35rem;
  border-radius: 4px;
  text-decoration: none;
}

nav a::before {
  content: "/";
  margin-right: 0.35rem;
  color: var(--line);
}

nav a:hover,
nav a[aria-current="page"],
nav a[aria-current="true"] {
  color: var(--ink);
  background: rgba(var(--accent-rgb), 0.12);
}

a:focus-visible,
button:focus-visible,
iframe:focus-visible,
select:focus-visible,
input:focus-visible {
  outline: 3px solid var(--accent-3);
  outline-offset: 3px;
}

main {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
  padding: 44px 0 72px;
}

section {
  margin-top: clamp(44px, 6vw, 72px);
  scroll-margin-top: 120px;
}

.course-header {
  display: grid;
  gap: 12px;
  margin-top: 0;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 13px;
  font-weight: 820;
  text-transform: uppercase;
}

h1 {
  max-width: 980px;
  margin: 0;
  font-size: clamp(42px, 8vw, 98px);
  line-height: 0.93;
  letter-spacing: 0;
}

.course-header h1 {
  max-width: 860px;
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1;
}

.lede {
  max-width: 780px;
  margin: 0;
  color: #d7dbe2;
  font-size: clamp(19px, 2.2vw, 27px);
  line-height: 1.42;
}

.course-header .lede {
  max-width: 820px;
  font-size: clamp(17px, 1.8vw, 21px);
}

.byline,
.links,
.tags,
.slide-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.byline {
  gap: 12px 18px;
  color: var(--muted);
  font-size: 16px;
}

.byline strong {
  color: var(--ink);
}

.course-tools {
  display: grid;
  grid-template-columns: minmax(280px, 0.85fr) minmax(320px, 1.15fr);
  gap: 14px;
}

.current-session-card,
.course-search,
.feature-card,
.session-card,
.notice,
.web-card,
.slides-reader {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(16, 20, 27, 0.86);
}

.current-session-card,
.course-search {
  display: grid;
  align-content: start;
  gap: 14px;
  padding: 18px;
}

.current-session-card h2,
.course-search h2 {
  margin: 0;
  font-size: clamp(26px, 3vw, 40px);
  line-height: 1.05;
}

.current-session-card p,
.course-search p,
.feature-card p,
.session-card p,
.notice p,
.web-card p {
  margin: 0;
  color: var(--muted);
}

.course-tool-label,
.search-result-type,
.tag,
.session-kicker span {
  color: var(--accent);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 12px;
  font-weight: 760;
}

.course-tool-label,
.search-result-type {
  text-transform: uppercase;
}

.search-controls {
  display: grid;
  gap: 10px;
}

.search-controls input {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel-2);
  color: var(--ink);
  font: inherit;
}

.search-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.search-filter {
  min-height: 34px;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--muted);
  font: inherit;
  font-size: 13px;
  font-weight: 720;
  cursor: pointer;
}

.search-filter[aria-pressed="true"] {
  border-color: rgba(var(--accent-rgb), 0.72);
  color: var(--accent-ink);
  background: var(--accent);
}

.search-results {
  display: grid;
  gap: 8px;
  max-height: 420px;
  margin: 0;
  padding: 0;
  overflow: auto;
  list-style: none;
}

.search-results li[hidden],
.search-empty[hidden] {
  display: none;
}

.search-result-link {
  display: grid;
  gap: 3px;
  padding: 10px 11px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.025);
  text-decoration: none;
}

.search-result-link strong {
  color: var(--ink);
}

.search-result-link span:last-child,
.search-count,
.search-empty {
  color: var(--muted);
  font-size: 13px;
}

.section-heading {
  display: grid;
  gap: 10px;
  margin-bottom: 18px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1;
}

.section-heading p {
  max-width: 780px;
  margin: 0;
  color: var(--muted);
}

.notice {
  display: grid;
  gap: 8px;
  padding: 16px;
  margin-bottom: 16px;
  border-color: rgba(var(--accent-rgb), 0.36);
  background: rgba(16, 20, 27, 0.72);
}

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

.feature-grid,
.sessions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: 14px;
}

.feature-card,
.session-card {
  display: grid;
  gap: 12px;
  padding: 16px;
}

.feature-card h3,
.session-card h3,
.web-card h3 {
  margin: 0;
  font-size: 24px;
  line-height: 1.05;
  letter-spacing: 0;
}

.session-kicker {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
}

.links a,
.reader-button,
.slide-open-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 9px 12px;
  border: 1px solid rgba(var(--accent-rgb), 0.55);
  border-radius: 6px;
  background: rgba(var(--accent-rgb), 0.14);
  color: var(--ink);
  font: inherit;
  font-size: 14px;
  font-weight: 760;
  text-decoration: none;
  cursor: pointer;
}

.links a:not(.primary),
.reader-button {
  border-color: var(--line);
  background: var(--panel-2);
  color: var(--muted);
}

.links a:hover,
.reader-button:hover,
.slide-open-link:hover {
  border-color: rgba(var(--accent-rgb), 0.72);
  color: var(--ink);
}

.reader-button {
  display: none;
}

.slides-reader.is-enhanced .reader-button {
  display: inline-flex;
}

.web-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 310px), 1fr));
  gap: 16px;
}

.web-card {
  display: grid;
  overflow: hidden;
}

.preview {
  position: relative;
  aspect-ratio: 16 / 10;
  min-height: 230px;
  border-bottom: 1px solid var(--line);
  background: var(--code);
}

.preview iframe,
iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.preview iframe {
  min-height: 230px;
}

.preview.is-paused::after {
  content: "Preview paused until it is near the screen";
  position: absolute;
  inset: 0;
  z-index: 2;
  display: grid;
  place-items: center;
  padding: 18px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
  background: linear-gradient(135deg, rgba(5, 7, 10, 0.96), rgba(16, 20, 27, 0.96));
}

.preview.is-paused iframe {
  opacity: 0;
}

.is-hidden {
  display: none !important;
}

.web-card-content {
  display: grid;
  gap: 12px;
  padding: 16px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  padding: 5px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
}

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

.details span {
  color: var(--ink);
  font-weight: 760;
}

.slides-reader {
  display: grid;
  grid-template-columns: minmax(240px, 300px) minmax(0, 1fr);
  overflow: hidden;
}

.slide-controls {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: 16px;
  border-right: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.025);
}

.slide-list-label {
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 760;
  text-transform: uppercase;
}

.slide-select-label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.slide-select {
  width: 100%;
  min-height: 42px;
  padding: 8px 10px;
  border: 1px solid rgba(var(--accent-rgb), 0.62);
  border-radius: 6px;
  background: var(--panel-2);
  color: var(--ink);
  font: inherit;
  font-weight: 720;
}

.slide-fallback-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.slide-fallback-list a {
  display: block;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel-2);
  color: var(--ink);
  font-weight: 720;
  text-decoration: none;
}

.slide-fallback-list a:hover {
  border-color: rgba(var(--accent-rgb), 0.72);
  color: var(--accent);
}

.slide-viewer {
  display: grid;
  grid-template-rows: auto minmax(280px, 1fr);
  min-width: 0;
  overflow: hidden;
}

.slide-viewer-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--panel-2);
}

.slide-actions {
  justify-content: flex-end;
}

.slide-viewer-bar strong {
  color: var(--ink);
}

.slide-actions a {
  color: var(--accent);
  font-weight: 760;
}

.pdf-panel {
  display: grid;
  align-content: center;
  gap: 12px;
  min-height: clamp(280px, 42vh, 430px);
  padding: clamp(18px, 4vw, 34px);
  background:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    var(--code);
  background-size: 26px 26px;
}

.pdf-kicker {
  color: var(--accent);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 13px;
  font-weight: 760;
  text-transform: uppercase;
}

.pdf-panel p {
  max-width: 620px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(16px, 1.8vw, 20px);
}

.footer {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-top: 48px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 880px) {
  .course-tools,
  .slides-reader {
    grid-template-columns: 1fr;
  }

  .slide-controls {
    width: 100%;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
}

@media (max-width: 760px) {
  .topbar,
  .slide-viewer-bar {
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    justify-content: flex-start;
    width: 100%;
  }

  .slide-actions {
    justify-content: flex-start;
  }

  .slide-viewer {
    width: 100%;
  }

  .slide-list-label {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}