/* =========================================================
   Pradhya · The Capable Series · Design System
   Tagline: From curious to capable.
   Descriptor: The craft of working with AI.
   ========================================================= */

:root {
  /* V1 LOCKED palette — from Pradhya_Brand_Identity_v2 + ClaudeDesign brief */
  --teal:        #2FAA9C;
  --teal-deep:   #166F68;
  --citrus:      #FFE04D;
  --coral:       #FF5A4D;
  --coral-strong: #B73329;
  --ink:         #0A0E1F;
  --bone:        #FAF7F0;
  --mist:        #E8E4D8;
  --slate:       #52616F;
  --slate-strong: #3D4855;      /* 7.4:1 on bone — AAA. Use for italics + secondary text */
  --rule:        rgba(10, 14, 31, 0.14);
  --rule-strong: rgba(10, 14, 31, 0.4);

  /* Series tag colors */
  --tag-foundations: #FFE04D; /* Citrus */
  --tag-cadence:     #0F26B8; /* Cobalt deep */
  --tag-command:     #FF5A4D; /* Coral */
  --tag-council:     #C8CDD9; /* Mist cool */

  /* Typography */
  --serif: "Fraunces", "Cambria", "Iowan Old Style", "Times New Roman", serif;
  --sans:  "Inter", "Calibri", system-ui, -apple-system, sans-serif;
  --mono:  "JetBrains Mono", "Courier New", monospace;

  /* Rhythm */
  --col: 920px;
  --gutter: 80px;
  --gutter-sm: 28px;
  --radius: 0;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bone);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01" on, "cv11" on;
}

a {
  color: var(--teal-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
a:hover { color: var(--ink); }

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

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 999;
  width: 1px;
  height: 1px;
  overflow: hidden;
  white-space: nowrap;
  clip-path: inset(50%);
  background: var(--citrus);
  color: var(--ink);
  padding: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
}
.skip-link:focus,
.skip-link:focus-visible {
  width: auto;
  height: auto;
  overflow: visible;
  clip-path: none;
  padding: 10px 14px;
}

/* ---------- Wordmark ---------- */
.wordmark {
  display: inline-flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  line-height: 1;
  position: relative;
}
.wordmark .tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 6px;
}
.wordmark .tag::before { content: "[ "; opacity: 0.6; }
.wordmark .tag::after  { content: " ]"; opacity: 0.6; }
.wordmark .name {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 400;
  letter-spacing: -0.01em;
  position: relative;
  display: inline-block;
}
.wordmark .name::after {
  content: "";
  position: absolute;
  left: 2px; right: 2px;
  bottom: 3px;
  height: 6px;
  background: var(--citrus);
  z-index: -1;
  transform: skew(-2deg);
}
.wordmark .desc {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--slate);
  margin-top: 10px;
}

/* On dark backgrounds */
.bg-ink .wordmark .name,
.bg-ink .wordmark .desc { color: var(--bone); }
.bg-ink .wordmark .desc { color: rgba(250, 247, 240, 0.78); }

/* ---------- Top nav ---------- */
.topnav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bone);
  border-bottom: 1px solid var(--rule);
  backdrop-filter: saturate(140%) blur(8px);
}
.topnav .row {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px var(--gutter-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.topnav .links {
  display: flex;
  gap: 28px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
}
.topnav .links a {
  color: var(--slate);
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 1px solid transparent;
  transition: color .15s, border-color .15s;
}
.topnav .links a:hover,
.topnav .links a.active { color: var(--ink); border-bottom-color: var(--teal); }

@media (max-width: 720px) {
  .topnav .links { display: none; }
}

/* ---------- Layout shells ---------- */
.shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--gutter-sm);
}
.shell-narrow { max-width: var(--col); }

section.spread {
  padding: 96px var(--gutter) 96px;
  border-bottom: 1px solid var(--rule);
  position: relative;
}
@media (max-width: 800px) {
  section.spread { padding: 64px var(--gutter-sm); }
}

.bg-ink {
  background: var(--ink);
  color: var(--bone);
  border-bottom: 0;
}
.bg-ink h1, .bg-ink h2, .bg-ink h3, .bg-ink h4 { color: var(--bone); }
.bg-ink p { color: rgba(250, 247, 240, 0.88); }
.bg-ink .slate { color: rgba(250, 247, 240, 0.78); }
.bg-ink .rule { background: rgba(250, 247, 240, 0.18); }

.bg-mist { background: var(--mist); }

/* ---------- Folio / page furniture ---------- */
.folio {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 36px;
}
.folio .pip {
  width: 6px; height: 6px;
  background: var(--citrus);
  border-radius: 50%;
}
.folio .tline {
  flex: 1;
  height: 1px;
  background: var(--rule);
  margin-bottom: 4px;
}
.bg-ink .folio { color: var(--teal); }
.bg-ink .folio .tline { background: rgba(250, 247, 240, 0.2); }

.kicker {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--teal-deep);
  margin: 0 0 18px;
  display: inline-block;
}
.kicker.citrus { color: var(--ink); background: var(--citrus); padding: 3px 8px; }
.bg-ink .kicker { color: var(--teal); }

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 400;
  letter-spacing: -0.015em;
  margin: 0 0 18px;
  line-height: 1.05;
}
h1 { font-size: clamp(48px, 7vw, 96px); }
h2 { font-size: clamp(36px, 5vw, 64px); }
h3 { font-size: clamp(24px, 3vw, 32px); font-weight: 500; }
h4 { font-size: 20px; font-weight: 500; margin-bottom: 10px; }
h1 em, h2 em, h3 em { font-style: italic; font-weight: 400; color: var(--slate-strong); }
.bg-ink h1 em, .bg-ink h2 em, .bg-ink h3 em { color: rgba(250, 247, 240, 0.92); }

.lede {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.55;
  color: var(--slate-strong);
  max-width: 60ch;
  margin: 0 0 36px;
}
.bg-ink .lede { color: rgba(250, 247, 240, 0.92); }

p { margin: 0 0 16px; max-width: 64ch; }
p.tight { margin-bottom: 8px; }
strong { font-weight: 600; color: var(--ink); }
.bg-ink strong { color: var(--bone); }
em { color: var(--slate-strong); }
.bg-ink em { color: rgba(250, 247, 240, 0.92); }

blockquote {
  margin: 32px 0;
  padding: 4px 0 4px 24px;
  border-left: 2px solid var(--teal);
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: 24px;
  line-height: 1.45;
  color: var(--ink);
}
.bg-ink blockquote { border-left-color: var(--citrus); color: var(--bone); }

ul, ol { padding-left: 22px; margin: 8px 0 22px; }
ul li, ol li { margin: 6px 0; }
ul li::marker { color: var(--teal); }
ol li::marker { color: var(--teal); font-family: var(--mono); font-size: 13px; }

.bg-ink ul li::marker, .bg-ink ol li::marker { color: var(--citrus); }

/* ---------- Cards / grids ---------- */
.grid {
  display: grid;
  gap: 24px;
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.card {
  background: var(--bone);
  border: 1px solid var(--rule);
  padding: 32px;
  position: relative;
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.bg-ink .card {
  background: rgba(250, 247, 240, 0.04);
  border-color: rgba(250, 247, 240, 0.18);
}
.card:hover {
  transform: translateY(-2px);
  border-color: var(--teal);
}
.card .num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--teal-deep);
  margin-bottom: 18px;
  display: block;
}
.bg-ink .card .num { color: var(--teal); }

.card-day { padding: 36px; cursor: pointer; }
.card-day .tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 4px 10px;
  margin-bottom: 22px;
  background: var(--tag);
  color: var(--ink);
}
.card-day.day-2 .tag { background: var(--tag-cadence); color: var(--bone); }
.card-day.day-4 .tag { color: var(--ink); }
.card-day h3 { font-size: 36px; }
.card-day p { color: var(--slate); margin-bottom: 24px; }
.card-day .meta {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--slate);
  text-transform: uppercase;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
}
.bg-ink .card-day .meta { border-top-color: rgba(250, 247, 240, 0.18); }
.bg-ink .card-day p { color: rgba(250, 247, 240, 0.88); }

/* ---------- Buttons / CTAs ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  background: var(--coral);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  border: 0;
  cursor: pointer;
  transition: transform .15s, background .15s;
}
.btn:hover { background: var(--coral-strong); transform: translateY(-1px); color: var(--bone); }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
}
.bg-ink .btn-ghost { color: var(--bone); border-color: var(--bone); }
.btn-ghost:hover { background: var(--ink); color: var(--bone); }
.bg-ink .btn-ghost:hover { background: var(--bone); color: var(--ink); }
.btn-link {
  background: none;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0;
  border-bottom: 1px solid var(--teal);
  padding-bottom: 4px;
}
.bg-ink .btn-link { color: var(--bone); border-bottom-color: var(--citrus); }
.btn-link:hover { color: var(--teal-deep); }

/* ---------- Callouts / prompts ---------- */
.callout {
  background: var(--bone);
  border: 1px solid var(--rule);
  border-left: 2px solid var(--teal);
  padding: 22px 26px;
  margin: 28px 0;
  max-width: 64ch;
}
.callout .k {
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 8px;
}
.callout p { margin: 0; font-family: var(--serif); font-size: 17px; line-height: 1.5; }
.callout.warn { border-left-color: var(--coral); }
.callout.warn .k { color: var(--coral-strong); }
.callout.paper-trail {
  border-left-color: var(--citrus);
  background: rgba(255, 224, 77, 0.10);
}
.callout.paper-trail .k { color: var(--teal-deep); }
.callout.paper-trail p {
  font-family: var(--sans);
  font-size: 15.5px;
  line-height: 1.6;
}
.bg-ink .callout { background: rgba(250, 247, 240, 0.04); border-color: rgba(250, 247, 240, 0.18); }
.bg-ink .callout p { color: var(--bone); }

.prompt, pre.code {
  background: var(--mist);
  border-left: 2px solid var(--teal);
  padding: 20px 24px;
  margin: 22px 0;
  font-family: var(--mono);
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--ink);
  position: relative;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}
pre.code { white-space: pre; }
.prompt .copy, pre.code .copy {
  position: absolute;
  top: 12px; right: 12px;
  background: var(--ink);
  color: var(--bone);
  border: 0;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 7px 12px;
  transition: background .15s;
}
.prompt .copy:hover, pre.code .copy:hover { background: var(--teal-deep); }
.prompt .copy.ok, pre.code .copy.ok { background: var(--coral); }

.bg-ink .prompt, .bg-ink pre.code {
  background: rgba(250, 247, 240, 0.06);
  color: var(--bone);
  border-left-color: var(--citrus);
}

/* Code syntax tokens (minimal) */
.tok-kw  { color: var(--coral-strong); }
.tok-str { color: var(--teal-deep); }
.tok-com { color: var(--slate); font-style: italic; }
.tok-fn  { color: var(--ink); font-weight: 600; }
.bg-ink .tok-kw  { color: color-mix(in srgb, var(--coral), var(--bone) 35%); }
.bg-ink .tok-str { color: color-mix(in srgb, var(--teal), var(--bone) 35%); }
.bg-ink .tok-com { color: rgba(250, 247, 240, 0.7); }
.bg-ink .tok-fn  { color: var(--bone); }

/* ---------- Tables ---------- */
table {
  border-collapse: collapse;
  width: 100%;
  margin: 22px 0;
  font-size: 15px;
}
th, td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
th {
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate-strong);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
.bg-ink th { color: var(--teal); border-color: rgba(250, 247, 240, 0.4); }
.bg-ink td { border-bottom-color: rgba(250, 247, 240, 0.14); }

/* ---------- Footer ---------- */
footer.site {
  background: var(--ink);
  color: var(--bone);
  padding: 80px var(--gutter-sm);
  text-align: center;
}
footer.site .desc {
  font-family: var(--mono);
  font-size: 10px;
  color: rgba(250, 247, 240, 0.55);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  margin-top: 22px;
}
footer.site .legal {
  margin-top: 24px;
  font-size: 12px;
  color: rgba(250, 247, 240, 0.75);
}

/* ---------- Workshop visual primitives ---------- */

/* Token stream visualization (Day 1) */
.token-stream {
  font-family: var(--mono);
  font-size: 14px;
  line-height: 2.2;
  background: var(--mist);
  padding: 24px;
  border-left: 2px solid var(--teal);
  min-height: 120px;
  letter-spacing: 0.02em;
}
.token-stream .tok {
  display: inline-block;
  background: var(--bone);
  padding: 2px 6px;
  margin: 0 2px;
  border-radius: 2px;
  opacity: 0;
  transform: translateY(4px);
  animation: tok-in .35s forwards;
  border: 1px solid var(--rule);
}
.token-stream .tok.next {
  background: var(--citrus);
  color: var(--ink);
  font-weight: 600;
}
.token-stream .tok.cand {
  background: rgba(255, 224, 77, 0.3);
  border-color: var(--citrus);
  font-size: 11px;
  margin-left: 4px;
}
@keyframes tok-in {
  to { opacity: 1; transform: translateY(0); }
}

/* Context window slider */
.ctx-window {
  position: relative;
  font-family: var(--mono);
  font-size: 12px;
  background: var(--mist);
  padding: 28px 24px;
  border-left: 2px solid var(--teal);
}
.ctx-window .tape {
  display: flex;
  gap: 2px;
  margin: 14px 0 8px;
  overflow: hidden;
  height: 28px;
  position: relative;
  background: var(--bone);
  border: 1px solid var(--rule);
}
.ctx-window .cell {
  flex: 1;
  background: var(--teal);
  opacity: 0.85;
  transition: opacity .3s, background .3s;
}
.ctx-window .cell.lost {
  background: var(--slate);
  opacity: 0.2;
}
.ctx-window .cell.cur {
  background: var(--citrus);
}
.ctx-window .ruler {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  color: var(--slate);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.ctx-window input[type=range] {
  width: 100%;
  accent-color: var(--teal-deep);
  margin: 8px 0;
}

/* Prompt ladder (Day 2) */
.ladder {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border: 1px solid var(--rule);
  margin: 24px 0;
}
.ladder .rung {
  display: grid;
  grid-template-columns: 80px 1fr 280px;
  border-bottom: 1px solid var(--rule);
  cursor: pointer;
  transition: background .2s;
}
.ladder .rung:focus-visible {
  outline: 3px solid var(--citrus);
  outline-offset: -3px;
}
.ladder .rung:last-child { border-bottom: 0; }
.ladder .rung:hover { background: var(--mist); }
.ladder .rung.active { background: var(--mist); }
.ladder .rung .n {
  background: var(--ink);
  color: var(--bone);
  font-family: var(--mono);
  font-size: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.ladder .rung.active .n { background: var(--teal-deep); }
.ladder .rung .body { padding: 22px 26px; }
.ladder .rung .body h4 { margin: 0 0 6px; font-family: var(--serif); font-size: 22px; font-weight: 500; }
.ladder .rung .body p { margin: 0; color: var(--slate); font-size: 14px; }
.ladder .rung .right {
  padding: 22px 26px;
  border-left: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 12px;
  background: var(--mist);
  color: var(--slate);
}
@media (max-width: 800px) {
  .ladder .rung { grid-template-columns: 60px 1fr; }
  .ladder .rung .right { display: none; }
}

/* Tool-call diagram (Day 3) */
.tool-call {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 24px;
  align-items: center;
  background: var(--mist);
  padding: 36px 28px;
  margin: 28px 0;
}
.tool-call .node {
  background: var(--bone);
  border: 1px solid var(--rule);
  padding: 18px 22px;
  text-align: center;
}
.tool-call .node.model { border-left: 2px solid var(--teal); }
.tool-call .node.tool  { border-left: 2px solid var(--citrus); }
.tool-call .node h4 { margin: 0 0 6px; font-family: var(--serif); font-size: 18px; }
.tool-call .node p  { margin: 0; font-family: var(--mono); font-size: 11px; color: var(--slate); text-transform: uppercase; letter-spacing: 0.14em; }
.tool-call .arrows {
  width: 200px;
  height: 100px;
  position: relative;
}
.tool-call .arrows svg { width: 100%; height: 100%; overflow: visible; }
.tool-call .arrows .label {
  position: absolute;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
  white-space: nowrap;
}
.tool-call .arrows .label.top { top: -2px; left: 50%; transform: translateX(-50%); color: var(--teal-deep); }
.tool-call .arrows .label.bot { bottom: -2px; left: 50%; transform: translateX(-50%); color: var(--ink); background: var(--citrus); padding: 2px 6px; }

/* Agent loop (Day 4) */
.agent-loop {
  position: relative;
  width: 100%;
  max-width: 520px;
  aspect-ratio: 1 / 1;
  margin: 36px auto;
}
.agent-loop svg { width: 100%; height: 100%; }
.agent-loop .stage {
  position: absolute;
  background: var(--bone);
  border: 1px solid var(--rule);
  padding: 14px 18px;
  text-align: center;
  min-width: 130px;
  transition: transform .3s, border-color .3s, background .3s;
}
.agent-loop .stage h4 { margin: 0; font-family: var(--serif); font-size: 18px; }
.agent-loop .stage p  { margin: 4px 0 0; font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--slate); }
.agent-loop .stage.s-plan    { top: 0; left: 50%; transform: translate(-50%, -50%); }
.agent-loop .stage.s-act     { right: 0; top: 50%; transform: translate(50%, -50%); }
.agent-loop .stage.s-observe { bottom: 0; left: 50%; transform: translate(-50%, 50%); }
.agent-loop .stage.s-reflect { left: 0; top: 50%; transform: translate(-50%, -50%); }
.agent-loop .stage.active { background: var(--citrus); border-color: var(--ink); }
.agent-loop .stage.active.s-plan    { transform: translate(-50%, -50%) scale(1.08); }
.agent-loop .stage.active.s-act     { transform: translate(50%, -50%) scale(1.08); }
.agent-loop .stage.active.s-observe { transform: translate(-50%, 50%) scale(1.08); }
.agent-loop .stage.active.s-reflect { transform: translate(-50%, -50%) scale(1.08); }

.bg-ink .agent-loop .stage { background: rgba(250, 247, 240, 0.04); border-color: rgba(250, 247, 240, 0.18); }
.bg-ink .agent-loop .stage h4 { color: var(--bone); }
.bg-ink .agent-loop .stage p { color: rgba(250, 247, 240, 0.8); }
.bg-ink .agent-loop .stage.active { background: var(--citrus); border-color: var(--citrus); }
.bg-ink .agent-loop .stage.active h4 { color: var(--ink); }
.bg-ink .agent-loop .stage.active p { color: rgba(10, 14, 31, 0.7); }

/* Annotation (book-margin style) */
.anno {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 36px;
}
.anno .margin {
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.6;
  color: var(--slate);
  letter-spacing: 0.02em;
  padding-top: 8px;
  border-top: 1px solid var(--rule);
}
.anno .margin .tag {
  display: block;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--teal-deep);
  margin-bottom: 6px;
}
.bg-ink .anno .margin .tag { color: var(--teal); }
@media (max-width: 900px) {
  .anno { grid-template-columns: 1fr; }
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--rule);
  margin: 22px 0 0;
}
.tabs button {
  background: none;
  border: 0;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
  padding: 10px 18px 12px;
  min-height: 44px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color .15s, border-color .15s;
}
.tabs button:hover { color: var(--ink); }
.tabs button.active { color: var(--ink); border-bottom-color: var(--teal); }
.bg-ink .tabs { border-bottom-color: rgba(250, 247, 240, 0.18); }
.bg-ink .tabs button { color: rgba(250, 247, 240, 0.75); }
.bg-ink .tabs button:hover { color: var(--bone); }
.bg-ink .tabs button.active { color: var(--bone); border-bottom-color: var(--citrus); }

.tab-panel { display: none; padding-top: 22px; }
.tab-panel.active { display: block; }

/* Prompt builder (Day 2) */
.builder {
  background: var(--mist);
  padding: 28px;
  border-left: 2px solid var(--teal);
  margin: 28px 0;
}
.builder label {
  display: block;
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate-strong);
  margin: 14px 0 4px;
}
.builder textarea, .builder input[type=text] {
  width: 100%;
  background: var(--bone);
  border: 1px solid var(--rule);
  padding: 12px 14px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
  resize: vertical;
  line-height: 1.55;
}
.builder textarea:focus, .builder input:focus {
  outline: 0;
  border-color: var(--teal);
}
.builder .output {
  background: var(--ink);
  color: var(--bone);
  padding: 22px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.65;
  margin-top: 20px;
  position: relative;
  white-space: pre-wrap;
  min-height: 120px;
}
.builder .output::before {
  content: "Assembled prompt";
  position: absolute;
  top: -1px; left: -1px;
  background: var(--teal);
  color: var(--ink);
  padding: 4px 10px;
  font-size: 9px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}
.builder .output .copy {
  position: absolute;
  top: 10px; right: 10px;
  background: var(--coral);
  color: var(--ink);
  border: 0;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 5px 10px;
}
.builder .output .copy.ok { background: var(--citrus); color: var(--ink); }

/* Concept tiles (Day 1) */
.tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0;
  border: 1px solid var(--rule);
}
.tile {
  padding: 32px 28px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: var(--bone);
}
.tile:last-child { border-right: 0; }
.tile .icon {
  width: 36px; height: 36px;
  background: var(--teal);
  margin-bottom: 18px;
  position: relative;
}
.tile .icon::after {
  content: "";
  position: absolute;
  width: 12px; height: 12px;
  background: var(--citrus);
  bottom: -4px; right: -4px;
}
.tile h4 {
  font-family: var(--serif);
  font-size: 22px;
  margin: 0 0 8px;
}
.tile p { color: var(--slate); font-size: 14px; margin: 0; }

/* Hero specifically */
.hero {
  padding: 120px var(--gutter-sm) 100px;
  background: var(--ink);
  color: var(--bone);
  position: relative;
  overflow: hidden;
}
.hero .inner { max-width: 1100px; margin: 0 auto; position: relative; z-index: 2; }
.hero h1 {
  font-size: clamp(56px, 10vw, 128px);
  line-height: 0.95;
  margin: 28px 0 30px;
  max-width: 14ch;
}
.hero h1 .citrus {
  background: var(--citrus);
  color: var(--ink);
  padding: 0 10px;
  font-style: italic;
  font-weight: 400;
  white-space: nowrap;
  display: inline-block;
  transform: skew(-2deg);
}
.hero .sub {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 22px;
}
.hero .tagline {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(22px, 2.6vw, 28px);
  max-width: 56ch;
  color: rgba(250, 247, 240, 0.92);
  margin: 0 0 40px;
}
.hero .cta-row {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  align-items: center;
}
.hero .bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(250, 247, 240, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(250, 247, 240, 0.04) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
}

/* Floating cobalt sandwich divider */
.divider {
  background: var(--ink);
  color: var(--bone);
  padding: 72px var(--gutter-sm);
  text-align: center;
}
.divider .num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.32em;
  color: var(--teal);
  text-transform: uppercase;
  margin-bottom: 18px;
}
.divider h2 { color: var(--bone); margin: 0; }
.divider .tag {
  display: inline-block;
  background: var(--citrus);
  color: var(--ink);
  padding: 3px 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-top: 22px;
}

/* Misc */
.spacer { height: 48px; }
.rule { height: 1px; background: var(--rule); width: 100%; margin: 32px 0; }
.center { text-align: center; }
.pill {
  display: inline-block;
  background: var(--mist);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 5px 10px;
  margin-right: 6px;
}

/* Selection */
::selection { background: var(--citrus); color: var(--ink); }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* =========================================================
   LEARN-SHELL · educational learning site layout
   Three-column grid: left sidebar / reading column / right rail
   Used by every workshop day. The marketing-style classes above
   are retained for the landing page only.
   ========================================================= */

.learn-shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr) 240px;
  min-height: 100vh;
  background: var(--bone);
}
@media (max-width: 1180px) {
  .learn-shell { grid-template-columns: 260px minmax(0, 1fr); }
  .learn-rail { display: none !important; }
}
@media (max-width: 900px) {
  .learn-shell { grid-template-columns: 1fr; }
  .learn-content { overflow-x: clip; }
  .learn-side {
    display: none;  /* hidden by default on mobile; toggle-side button reveals it */
    position: static !important;
    height: auto !important;
    max-height: none !important;
    border-right: 0 !important;
    border-bottom: 1px solid var(--rule);
  }
}

/* ---------- Left sidebar (the whole-course TOC) ---------- */
.learn-side {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow-y: auto;
  background: var(--ink);
  color: var(--bone);
  padding: 36px 22px 36px;
  border-right: 1px solid var(--ink);
  font-size: 14px;
}
.learn-side::-webkit-scrollbar { width: 8px; }
.learn-side::-webkit-scrollbar-track { background: var(--ink); }
.learn-side::-webkit-scrollbar-thumb { background: rgba(250,247,240,0.18); border-radius: 4px; }

.learn-side .brand {
  display: block;
  text-decoration: none;
  color: var(--bone);
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(250, 247, 240, 0.14);
}
.learn-side .brand .tag {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 6px;
  display: block;
}
.learn-side .brand .tag::before { content: "[ "; opacity: 0.6; }
.learn-side .brand .tag::after  { content: " ]"; opacity: 0.6; }
.learn-side .brand .name {
  font-family: var(--serif);
  font-size: 22px;
  display: inline-block;
  position: relative;
  letter-spacing: -0.01em;
}
.learn-side .brand .name::after {
  content: "";
  position: absolute;
  left: 1px; right: 1px;
  bottom: 2px;
  height: 5px;
  background: var(--citrus);
  z-index: -1;
  transform: skew(-2deg);
}
.learn-side .brand .desc {
  display: block;
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: rgba(250, 247, 240, 0.75);
}

.learn-side .toc-search {
  position: relative;
  margin-bottom: 26px;
}
.learn-side .toc-search input {
  width: 100%;
  background: rgba(250, 247, 240, 0.06);
  border: 1px solid rgba(250, 247, 240, 0.12);
  color: var(--bone);
  font-family: var(--sans);
  font-size: 13px;
  padding: 9px 12px 9px 30px;
  outline: 0;
  transition: border-color .15s, background .15s;
}
.learn-side .toc-search input:focus {
  border-color: var(--teal);
  background: rgba(250, 247, 240, 0.08);
}
.learn-side .toc-search::before {
  content: "⌕";
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-55%);
  color: rgba(250, 247, 240, 0.45);
  font-size: 14px;
}

.learn-side .section-label {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 26px 0 8px;
  padding: 0;
  font-weight: 500;
}
.learn-side .section-label:first-of-type { margin-top: 0; }

.learn-side .section-label .badge {
  display: inline-block;
  background: var(--citrus);
  color: var(--ink);
  font-size: 9px;
  padding: 1px 6px;
  margin-left: 6px;
  letter-spacing: 0.14em;
  vertical-align: middle;
}

.learn-side ul.toc {
  list-style: none;
  padding: 0;
  margin: 0 0 8px;
}
.learn-side ul.toc li { margin: 0; }
.learn-side ul.toc a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 10px 7px 12px;
  margin-left: -10px;
  color: rgba(250, 247, 240, 0.85);
  text-decoration: none;
  font-size: 14.5px;
  line-height: 1.4;
  border-left: 2px solid transparent;
  transition: color .15s, background .15s, border-color .15s;
}
.learn-side ul.toc a .n {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--teal);
  flex: 0 0 28px;
  letter-spacing: 0.04em;
}
.learn-side ul.toc a:hover {
  color: var(--bone);
  background: rgba(250, 247, 240, 0.04);
}
.learn-side ul.toc a.active {
  color: var(--citrus);
  background: rgba(255, 224, 77, 0.06);
  border-left-color: var(--citrus);
}
.learn-side ul.toc a.active .n {
  color: var(--citrus);
}
.learn-side ul.toc a.current-page {
  color: var(--bone);
}

.learn-side .foot {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid rgba(250, 247, 240, 0.14);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(250, 247, 240, 0.4);
}
.learn-side .foot a {
  display: block;
  color: rgba(250, 247, 240, 0.6);
  text-decoration: none;
  padding: 4px 0;
}
.learn-side .foot a:hover { color: var(--citrus); }

/* ---------- Reading column ---------- */
.learn-content {
  padding: 0;
  min-width: 0;        /* prevent grid overflow with long code blocks */
  background: var(--bone);
}
.learn-content .topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--bone);
  border-bottom: 1px solid var(--rule);
  padding: 14px 56px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
}
.learn-content .topbar .crumb a {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.learn-content .topbar .crumb a:hover { color: var(--ink); border-bottom-color: var(--teal); }
.learn-content .topbar .crumb .sep { margin: 0 8px; opacity: 0.4; }
.learn-content .topbar .crumb .here { color: var(--ink); }
.learn-content .topbar .progress {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.learn-content .topbar .progress .bar {
  width: 80px;
  height: 4px;
  background: var(--mist);
  position: relative;
  overflow: hidden;
}
.learn-content .topbar .progress .bar > i {
  position: absolute;
  inset: 0 auto 0 0;
  background: var(--teal);
  width: var(--p, 0%);
  transition: width .2s linear;
}

.learn-content .reading {
  max-width: 760px;
  margin: 0 auto;
  padding: 60px 56px 80px;
}
.learn-content .reading > .day-hat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 22px;
}
.learn-content .reading > .day-hat .pip {
  width: 6px; height: 6px;
  background: var(--citrus);
  border-radius: 50%;
  display: inline-block;
}

.learn-content .reading h1 {
  font-family: var(--serif);
  font-size: clamp(40px, 5vw, 64px);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.015em;
  margin: 0 0 18px;
}
.learn-content .reading h1 em {
  font-style: italic;
  font-weight: 400;
  color: var(--slate-strong);
}
.learn-content .reading > p.lede {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: 22px;
  line-height: 1.55;
  color: var(--slate-strong);
  max-width: 64ch;
  margin: 0 0 40px;
}

/* unit blocks within a day page */
.unit {
  scroll-margin-top: 72px;     /* offset for sticky topbar */
  padding: 56px 0;
  border-top: 1px solid var(--rule);
}
.unit:first-of-type { border-top: 0; padding-top: 16px; }
.unit > .u-num {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal-deep);
  margin: 0 0 14px;
  display: inline-block;
}
.unit > h2 {
  font-family: var(--serif);
  font-size: clamp(30px, 3.6vw, 42px);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
}
.unit > h2 em { font-style: italic; font-weight: 400; color: var(--slate-strong); }
.unit > p.lede {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: 20px;
  line-height: 1.55;
  color: var(--slate-strong);
  max-width: 62ch;
  margin: 0 0 24px;
}
.unit h3 {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 500;
  margin: 28px 0 10px;
  letter-spacing: -0.005em;
}
.unit h3 em { font-style: italic; font-weight: 400; color: var(--slate-strong); }
.unit p, .unit ul, .unit ol { font-size: 17px; line-height: 1.7; }
.unit p { margin: 0 0 14px; }
.unit li { margin: 8px 0; }

.unit .keypoint {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.5;
  padding: 16px 22px;
  margin: 22px 0;
  background: var(--mist);
  border-left: 2px solid var(--teal);
}
.unit .keypoint strong {
  display: block;
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 8px;
  font-style: normal;
}

/* prev/next foot navigation */
.lesson-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 60px;
  padding-top: 32px;
  border-top: 1px solid var(--rule);
}
.lesson-nav a {
  display: block;
  padding: 22px 24px;
  border: 1px solid var(--rule);
  text-decoration: none;
  color: var(--ink);
  transition: border-color .2s, background .2s;
}
.lesson-nav a:hover { border-color: var(--teal); background: var(--mist); }
.lesson-nav a .label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 6px;
  display: block;
}
.lesson-nav a .title {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 500;
}
.lesson-nav a.next { text-align: right; }
.lesson-nav a.disabled { opacity: 0.35; pointer-events: none; }

/* right rail "on this page" */
.learn-rail {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow-y: auto;
  padding: 90px 28px 40px;
  font-size: 14px;
  border-left: 1px solid var(--rule);
  background: var(--bone);
}
.learn-rail .rail-label {
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 14px;
}
.learn-rail ul {
  list-style: none;
  padding: 0;
  margin: 0;
  border-left: 1px solid var(--rule);
}
.learn-rail ul li { margin: 0; }
.learn-rail ul a {
  display: block;
  padding: 6px 0 6px 14px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--slate);
  text-decoration: none;
  line-height: 1.35;
  transition: color .15s, border-color .15s;
}
.learn-rail ul a:hover { color: var(--ink); }
.learn-rail ul a.active {
  color: var(--ink);
  border-left-color: var(--teal);
  font-weight: 500;
}

/* ---------- TOC landing (index.html) ---------- */
.syllabus {
  max-width: 920px;
  margin: 0 auto;
  padding: 80px 56px 100px;
}
.syllabus > .day-block {
  margin-top: 56px;
  padding-top: 48px;
  border-top: 1px solid var(--rule);
}
.syllabus > .day-block:first-of-type { border-top: 0; padding-top: 0; margin-top: 0; }
.syllabus .day-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.syllabus .day-head h2 {
  font-family: var(--serif);
  font-size: clamp(28px, 3.4vw, 38px);
  font-weight: 400;
  letter-spacing: -0.01em;
  margin: 0;
}
.syllabus .day-head .day-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 4px 10px;
  background: var(--tag, var(--citrus));
  color: var(--ink);
}
.syllabus .day-meta {
  font-family: var(--serif);
  font-style: italic;
  font-size: 17px;
  color: var(--slate);
  max-width: 56ch;
  margin: 0 0 20px;
}
.syllabus ol.lessons {
  list-style: none;
  padding: 0;
  margin: 0;
  border: 1px solid var(--rule);
}
.syllabus ol.lessons li { border-top: 1px solid var(--rule); }
.syllabus ol.lessons li:first-child { border-top: 0; }
.syllabus ol.lessons a {
  display: grid;
  grid-template-columns: 60px 1fr auto;
  gap: 18px;
  padding: 18px 22px;
  text-decoration: none;
  color: var(--ink);
  transition: background .15s;
}
.syllabus ol.lessons a:hover { background: var(--mist); }
.syllabus ol.lessons a .n {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--teal-deep);
  letter-spacing: 0.06em;
  padding-top: 4px;
}
.syllabus ol.lessons a .label {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 400;
}
.syllabus ol.lessons a .label small {
  display: block;
  margin-top: 4px;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--slate);
  font-weight: 400;
}
.syllabus ol.lessons a .pip {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate);
  align-self: center;
}

/* When a lesson item carries [data-handson] it gets a yellow rule */
.syllabus ol.lessons li[data-handson] { border-left: 2px solid var(--citrus); }
.syllabus ol.lessons li[data-handson] .pip { color: var(--ink); background: var(--citrus); padding: 2px 8px; }

/* Mobile slide-in sidebar */
.toggle-side {
  display: none;
  position: fixed;
  top: 12px;
  right: 16px;
  z-index: 100;
  background: var(--ink);
  color: var(--bone);
  border: 0;
  min-height: 44px;
  padding: 10px 14px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  cursor: pointer;
}
@media (max-width: 900px) {
  .toggle-side { display: block; }
  .learn-content .topbar { padding: 14px 24px; }
  .learn-content .reading { padding: 40px 24px 60px; }
  .syllabus { padding: 60px 24px 80px; }
  .syllabus ol.lessons a { grid-template-columns: 50px 1fr; }
  .syllabus ol.lessons a .pip { display: none; }
}

/* Unit visuals inside reading column should stay narrow */
.unit .token-stream,
.unit .ctx-window,
.unit .builder,
.unit .ladder,
.unit .toolflow,
.unit .loop-wrap,
.unit pre.code,
.unit .prompt,
.unit table,
.unit .callout,
.unit .keypoint {
  max-width: 100%;
}

.unit pre.code,
.unit .prompt,
.unit table {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.unit pre.code {
  white-space: pre;
}

.unit .prompt {
  overflow-wrap: anywhere;
}

.unit .lab,
.unit .lab-row,
.unit .lab-val,
.unit .exca,
.unit .agent-loop,
.unit .tool-call {
  max-width: 100%;
  min-width: 0;
}

.unit code {
  overflow-wrap: anywhere;
}

@media (max-width: 700px) {
  .unit .lab {
    padding: 20px 18px;
  }
  .lab .lab-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }
  .agent-loop {
    max-width: min(100%, 320px);
    margin: 28px auto;
  }
  .agent-loop .stage {
    min-width: 104px;
    padding: 10px 12px;
  }
  .agent-loop .stage h4 { font-size: 16px; }
  .agent-loop .stage p { font-size: 9px; letter-spacing: 0.1em; }
  .tool-call {
    grid-template-columns: 1fr;
  }
  .tool-call .arrows {
    width: 100%;
  }
  .unit pre.code {
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    word-break: break-word;
  }
  .unit table {
    table-layout: fixed;
    display: table;
  }
  .unit th,
  .unit td {
    overflow-wrap: anywhere;
    word-break: break-word;
  }
  .unit .loop-wrap {
    max-width: min(100%, 240px);
  }
  .unit .loop-wrap .stage {
    min-width: 104px;
    padding: 10px 12px;
  }
  .unit .loop-wrap .stage h4 { font-size: 16px; }
  .unit .loop-wrap .stage p {
    font-size: 9px;
    letter-spacing: 0.1em;
  }
  .unit .loop-wrap .stage.s-act {
    right: 0;
    transform: translate(0, -50%);
  }
  .unit .loop-wrap .stage.s-reflect {
    left: 0;
    transform: translate(0, -50%);
  }
  .unit .loop-wrap .stage.active.s-act {
    transform: translate(0, -50%) scale(1.04);
  }
  .unit .loop-wrap .stage.active.s-reflect {
    transform: translate(0, -50%) scale(1.04);
  }
}

/* Make agent-loop smaller inside reading column */
.unit .loop-wrap { max-width: 460px; }

/* Tighten cards inside reading column */
.unit .grid-2 { grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 700px) {
  .unit .grid-2 { grid-template-columns: 1fr; }
}

/* =========================================================
   EXCALIDRAW-STYLE PRIMITIVES + ANIMATION LIBRARY
   Hand-drawn diagrams + draw-on / fade-in / pop / flow animations.
   Used across every workshop to make concepts visual.
   ========================================================= */

.hand {
  font-family: "Caveat", "Patrick Hand", "Comic Sans MS", cursive;
}

.exca {
  position: relative;
  background: var(--bone);
  border: 1px solid var(--rule);
  padding: 32px 28px 40px;
  margin: 28px 0;
  font-family: "Caveat", "Patrick Hand", "Comic Sans MS", cursive;
  overflow: hidden;
}
.exca .exca-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(10, 14, 31, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10, 14, 31, 0.03) 1px, transparent 1px);
  background-size: 22px 22px;
  pointer-events: none;
  z-index: 0;
}
.exca > svg, .exca > .stack, .exca > .exca-cap, .exca > .sticky {
  position: relative;
  z-index: 1;
}
.exca > svg {
  width: 100%;
  max-height: 480px;
  display: block;
}
.exca .exca-cap {
  text-align: center;
  font-family: var(--sans);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate-strong);
  margin-top: 16px;
}

.source-note {
  margin: -12px 0 24px;
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--slate-strong);
  overflow-wrap: anywhere;
}
.source-note a {
  color: var(--teal-deep);
  overflow-wrap: anywhere;
}

.exca svg .draw {
  fill: none;
  stroke: var(--ink);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.exca svg .fill-bone   { fill: var(--bone); }
.exca svg .fill-mist   { fill: var(--mist); }
.exca svg .fill-citrus { fill: var(--citrus); }
.exca svg .fill-coral  { fill: var(--coral); }
.exca svg .fill-teal   { fill: var(--teal); }
.exca svg .stroke-teal   { stroke: var(--teal-deep); }
.exca svg .stroke-coral  { stroke: var(--coral); }
.exca svg .stroke-citrus { stroke: var(--citrus); }

.exca svg text {
  font-family: "Caveat", "Patrick Hand", "Comic Sans MS", cursive;
  fill: var(--ink);
  font-size: 30px;          /* up from 24 */
  font-weight: 600;
}
.exca svg text.small {
  font-size: 24px;          /* up from 19 */
  font-weight: 500;
  fill: var(--ink);         /* darker than slate for legibility on bone */
}
.exca svg text.mono {
  font-family: "JetBrains Mono", monospace;
  font-size: 16px;          /* up from 14 */
  font-weight: 500;
  letter-spacing: 0.06em;
  fill: var(--slate);
}
.exca svg text.tiny {
  font-size: 21px;          /* up from 17 — yes, "tiny" Caveat still needs to be big */
  fill: var(--slate);
}

/* Sticky-note overlay */
.exca .sticky {
  position: absolute;
  background: var(--citrus);
  color: var(--ink);
  padding: 10px 14px;
  font-family: "Caveat", cursive;
  font-size: 18px;
  line-height: 1.2;
  transform: rotate(-2deg);
  box-shadow: 2px 2px 0 rgba(10, 14, 31, 0.15);
  z-index: 3;
  max-width: 220px;
}
.exca .sticky.right { transform: rotate(2deg); }
.exca .sticky.coral { background: var(--coral); color: var(--bone); }

/* Highlighter under text */
.marker {
  background: linear-gradient(120deg, transparent 0%, var(--citrus) 25%, var(--citrus) 75%, transparent 100%);
  background-size: 100% 60%;
  background-repeat: no-repeat;
  background-position: 0 80%;
  padding: 0 2px;
}

/* Animation keyframes */
@keyframes draw-on {
  from { stroke-dashoffset: var(--dash-len, 1000); }
  to   { stroke-dashoffset: 0; }
}
@keyframes fade-in {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes pop {
  0%   { opacity: 0; transform: scale(0.7); }
  60%  { opacity: 1; transform: scale(1.06); }
  100% { opacity: 1; transform: scale(1); }
}
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.05); }
}
@keyframes flow-dash {
  to { stroke-dashoffset: -200; }
}

.exca.in-view svg [data-anim="draw-on"] {
  stroke-dasharray: var(--dash-len, 1000);
  stroke-dashoffset: var(--dash-len, 1000);
  animation: draw-on 1.4s ease-out forwards;
  animation-delay: var(--delay, 0s);
}
.exca.in-view svg [data-anim="fade-in"] {
  opacity: 0;
  animation: fade-in 0.5s ease-out forwards;
  animation-delay: var(--delay, 0s);
}
.exca.in-view svg [data-anim="pop"] {
  opacity: 0;
  animation: pop 0.6s ease-out forwards;
  animation-delay: var(--delay, 0s);
  transform-origin: center;
}
.exca.in-view svg [data-anim="flow"] {
  stroke-dasharray: 8 6;
  animation: flow-dash 1.4s linear infinite;
  animation-delay: var(--delay, 0s);
}
.exca.in-view svg [data-anim="pulse"] {
  animation: pulse 2.2s ease-in-out infinite;
  animation-delay: var(--delay, 0s);
  transform-origin: center;
}

@media (prefers-reduced-motion: reduce) {
  .exca.in-view svg [data-anim] {
    animation: none !important;
    opacity: 1 !important;
    stroke-dashoffset: 0 !important;
  }
}

/* ---------- Hands-on Lab blocks ---------- */
/* Used across every workshop. A lab is a self-contained exercise with
   setup, steps, verification, and a stretch goal. Visually distinct from
   surrounding prose so it reads as "now you do this." */
.lab {
  background: var(--mist);
  padding: 24px 28px;
  margin: 24px 0 32px;
  border-left: 3px solid var(--coral);
  border-radius: 0 4px 4px 0;
  position: relative;
}
.lab::before {
  content: "LAB";
  display: block;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  color: var(--coral-strong);
  font-weight: 600;
  margin-bottom: 10px;
}
.lab h4 {
  margin: 0 0 14px;
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 500;
  color: var(--ink);
}
.lab h4 em { font-style: italic; font-weight: 400; }
.lab .lab-row {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 14px;
  padding: 10px 0;
  border-top: 1px solid var(--rule);
  align-items: start;
  font-size: 14.5px;
  line-height: 1.6;
}
.lab .lab-row:first-of-type { border-top: 0; padding-top: 0; }
.lab .lab-row .lab-lab {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate-strong);
  padding-top: 3px;
}
.lab .lab-row .lab-val ol,
.lab .lab-row .lab-val ul { margin: 0; padding-left: 18px; }
.lab .lab-row .lab-val li { margin: 3px 0; }
.lab .lab-row .lab-val code {
  font-family: var(--mono);
  font-size: 12.5px;
  background: var(--bone);
  padding: 1px 5px;
  border-radius: 2px;
}
.lab .lab-stretch {
  margin: 14px 0 0;
  padding: 10px 14px;
  font-size: 13.5px;
  background: rgba(255, 224, 77, 0.10);
  border-left: 2px solid var(--citrus);
  color: var(--slate-strong);
}
.lab .lab-stretch strong { color: var(--ink); }