:root {
  --canvas-night: #000000;
  --canvas-night-soft: #0a0a0a;
  --on-primary: #ffffff;
  --on-primary-mute: #f0f0fa;
  --hairline: #3a3a3f;
  --hairline-soft: #232326;
  --live-red: #ff3b30;
  --callout: #1a1a12;
  --callout-border: #5a5430;
  --font: 'Inter', 'Arial Narrow', Arial, Verdana, sans-serif;
  --max: 1200px;
  --prose: 720px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--canvas-night);
  color: var(--on-primary);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

a { color: var(--on-primary); text-decoration: underline; text-underline-offset: 2px; }
a:hover { opacity: 0.7; }
a.plain { text-decoration: none; }

/* ---------- site nav ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(0, 0, 0, 0.92);
  border-bottom: none;
  backdrop-filter: blur(8px);
}
.site-nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.site-nav-brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  line-height: 0;
}
.site-nav-brand:hover { opacity: 0.7; }
.site-nav-logo {
  display: block;
  height: 28px;
  width: auto;
}
.site-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  align-items: center;
}
.site-nav-links a {
  text-decoration: none;
  text-transform: uppercase;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.96px;
  color: var(--on-primary-mute);
}
.site-nav-links a:hover,
.site-nav-links a[aria-current="page"] {
  color: var(--on-primary);
  opacity: 1;
}

.micro-cap {
  text-transform: uppercase;
  font-size: 12px;
  font-weight: 400;
  line-height: 1.6;
  letter-spacing: 0.96px;
  color: var(--on-primary-mute);
}
.display {
  text-transform: uppercase;
  font-weight: 700;
  margin: 0;
  color: var(--on-primary);
}
.display-xxl { font-size: clamp(36px, 7vw, 72px); line-height: 0.95; letter-spacing: 1.6px; }
.display-xl { font-size: clamp(28px, 5vw, 48px); line-height: 1.05; letter-spacing: 1.2px; }
.body-lg { font-size: 16px; line-height: 1.7; letter-spacing: 0.32px; color: var(--on-primary-mute); font-weight: 400; }

.ghost-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: 1px solid var(--on-primary);
  color: var(--on-primary);
  text-decoration: none;
  text-transform: uppercase;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.1px;
  padding: 18px 24px;
  border-radius: 32px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.ghost-pill:hover { background: var(--on-primary); color: var(--canvas-night); opacity: 1; }
.ghost-pill.sm { padding: 10px 16px; font-size: 11px; }

.band { padding: 80px 24px; border-bottom: 1px solid var(--hairline); }
.band-inner { max-width: var(--max); margin: 0 auto; }
.band:last-of-type { border-bottom: none; }

.hero-course {
  padding: 96px 24px 72px;
  border-bottom: 1px solid var(--hairline);
  background-image:
    radial-gradient(1px 1px at 10% 20%, rgba(255,255,255,0.5) 1px, transparent 0),
    radial-gradient(1px 1px at 80% 10%, rgba(255,255,255,0.35) 1px, transparent 0),
    radial-gradient(1px 1px at 60% 70%, rgba(255,255,255,0.4) 1px, transparent 0),
    radial-gradient(1px 1px at 30% 85%, rgba(255,255,255,0.3) 1px, transparent 0),
    radial-gradient(1px 1px at 92% 55%, rgba(255,255,255,0.45) 1px, transparent 0),
    radial-gradient(1px 1px at 45% 40%, rgba(255,255,255,0.25) 1px, transparent 0);
  background-size: 600px 600px;
  background-repeat: repeat;
}
.hero-course-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  align-items: center;
}
.hero-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  margin-top: 8px;
}

.progress-line {
  font-size: 13px;
  letter-spacing: 0.4px;
  color: var(--on-primary-mute);
  opacity: 0.75;
}

/* ---------- phase / week grid ---------- */
.phase-block { margin-top: 48px; }
.phase-block:first-child { margin-top: 28px; }
.phase-title {
  text-transform: uppercase;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1px;
  margin: 0 0 16px;
}
.week-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
}
.week-card {
  background: var(--canvas-night-soft);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-decoration: none;
  color: inherit;
  min-height: 160px;
  transition: background 0.15s ease;
}
.week-card:hover {
  background: #121214;
  opacity: 1;
}
.week-card-top {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: flex-start;
}
.week-num {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--on-primary-mute);
  opacity: 0.7;
}
.week-card h3 {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.4px;
  line-height: 1.35;
  text-transform: uppercase;
}
.week-deliverable {
  margin: 0;
  font-size: 13px;
  line-height: 1.55;
  color: var(--on-primary-mute);
  opacity: 0.8;
  flex: 1;
}
.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.badge {
  display: inline-block;
  border: 1px solid var(--hairline);
  padding: 3px 8px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--on-primary-mute);
}
.badge.design { border-color: #4a4a60; }
.badge.review { border-color: #604a4a; }
.badge.done {
  border-color: #3a5a3a;
  color: #b8e0b8;
}

/* ---------- prose ---------- */
.page-shell {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 40px;
  max-width: var(--max);
  margin: 0 auto;
  padding: 48px 24px 96px;
}
@media (max-width: 900px) {
  .page-shell { grid-template-columns: 1fr; gap: 24px; padding-top: 32px; }
  .toc { position: static !important; }
}
.toc {
  position: sticky;
  top: 72px;
  align-self: start;
  max-height: calc(100svh - 96px);
  overflow: auto;
}
.toc-label {
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--on-primary-mute);
  opacity: 0.65;
  margin-bottom: 12px;
}
.toc nav a {
  display: block;
  text-decoration: none;
  font-size: 13px;
  line-height: 1.4;
  color: var(--on-primary-mute);
  padding: 6px 0;
  border-left: 1px solid var(--hairline-soft);
  padding-left: 12px;
}
.toc nav a:hover,
.toc nav a.active {
  color: var(--on-primary);
  border-left-color: var(--on-primary);
  opacity: 1;
}

.lesson-header {
  border-bottom: 1px solid var(--hairline);
  padding-bottom: 28px;
  margin-bottom: 36px;
}
.lesson-header h1 {
  text-transform: uppercase;
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: 1px;
  line-height: 1.1;
  margin: 12px 0 16px;
}
.topic-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 16px;
}
.topic-chip {
  border: 1px solid var(--hairline-soft);
  padding: 4px 10px;
  font-size: 11px;
  letter-spacing: 0.4px;
  color: var(--on-primary-mute);
}

.prose {
  max-width: var(--prose);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.2px;
  color: var(--on-primary-mute);
}
.prose h1,
.prose h2,
.prose h3,
.prose h4 {
  color: var(--on-primary);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  line-height: 1.25;
  scroll-margin-top: 88px;
}
.prose h1 { font-size: 28px; margin: 0 0 24px; }
.prose h2 { font-size: 20px; margin: 40px 0 14px; padding-top: 8px; border-top: 1px solid var(--hairline-soft); }
.prose h2:first-child { border-top: none; padding-top: 0; margin-top: 0; }
.prose h3 { font-size: 15px; margin: 28px 0 10px; }
.prose p { margin: 0 0 16px; }
.prose ul, .prose ol { margin: 0 0 16px; padding-left: 22px; }
.prose li { margin: 6px 0; }
.prose li > ul, .prose li > ol { margin-bottom: 0; }
.prose strong { color: var(--on-primary); font-weight: 700; }
.prose blockquote {
  margin: 20px 0;
  padding: 16px 18px;
  border-left: 2px solid var(--hairline);
  background: var(--canvas-night-soft);
  color: var(--on-primary-mute);
}
.prose blockquote.domain-pack {
  border-left-color: var(--callout-border);
  background: var(--callout);
}
.prose blockquote.domain-pack a {
  font-weight: 700;
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: 0 0 20px;
}
.prose .table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 0 0 20px;
  border: 1px solid var(--hairline-soft);
}
.prose .table-wrap table { margin: 0; }
.prose th, .prose td {
  border: 1px solid var(--hairline-soft);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}
.prose th {
  background: var(--canvas-night-soft);
  color: var(--on-primary);
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 0.8px;
}
.prose code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--canvas-night-soft);
  border: 1px solid var(--hairline-soft);
  padding: 1px 5px;
  border-radius: 3px;
}
.prose pre {
  margin: 0 0 20px;
  overflow-x: auto;
  border: 1px solid var(--hairline);
  background: #0d0d0f;
  padding: 0;
  position: relative;
}
.prose pre code {
  display: block;
  background: transparent;
  border: none;
  padding: 16px 18px;
  font-size: 13px;
  line-height: 1.55;
  white-space: pre;
  overflow-wrap: normal;
}
.prose .code-block {
  position: relative;
  margin: 0 0 20px;
}
.prose .code-block pre { margin: 0; }
.prose .copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 2;
  background: var(--canvas-night);
  border: 1px solid var(--hairline);
  color: var(--on-primary-mute);
  text-transform: uppercase;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.8px;
  padding: 6px 10px;
  cursor: pointer;
  font-family: var(--font);
}
.prose .copy-btn:hover { color: var(--on-primary); opacity: 1; }
.prose .task-list-item {
  list-style: none;
  margin-left: -22px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.prose .task-list-item input[type="checkbox"] {
  margin-top: 6px;
  accent-color: var(--on-primary);
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}
.prose hr {
  border: none;
  border-top: 1px solid var(--hairline);
  margin: 32px 0;
}
.prose img { max-width: 100%; height: auto; }

.pager {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--hairline);
}
.pager a {
  text-decoration: none;
  max-width: 46%;
}
.pager .label {
  display: block;
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 0.8px;
  color: var(--on-primary-mute);
  opacity: 0.65;
  margin-bottom: 4px;
}
.pager .title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--on-primary);
}
.pager .next { text-align: right; margin-left: auto; }

.footer { padding: 64px 24px 40px; }
.footer-inner { max-width: var(--max); margin: 0 auto; }
.footer-legal {
  font-size: 13px;
  color: var(--on-primary-mute);
  border-top: 1px solid var(--hairline);
  padding-top: 24px;
  margin-top: 32px;
}

.subnav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin-top: 8px;
}
.subnav a {
  text-decoration: none;
  text-transform: uppercase;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.96px;
  color: var(--on-primary-mute);
}
.subnav a:hover,
.subnav a[aria-current="page"] {
  color: var(--on-primary);
  opacity: 1;
}