/* ===== GL DESIGN SYSTEMS CASE STUDY =====
   Standalone layout for design-systems.html. Shares tokens from style.css
   (colors, Geist) but none of the cs-* case-study template. */

.ds {
  --ink: #0d0d0c;
  --paper: #fbfaf7;
  --code-bg: #14131a;
  --code-text: #e7e5f0;
  --code-dim: #8a8799;
  --code-key: #c4b5fd;
  --code-str: #86efac;
  --code-num: #fcd34d;
  --red: #dc2626;
  --amber: #b45309;
  --mono: 'Geist Mono', var(--font-mono);
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
  color: var(--text-2);
}

.ds *:focus-visible { outline: 2px solid var(--violet); outline-offset: 3px; }

.ds-mono { font-family: var(--mono); }

.ds-eyebrow {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--violet);
}

/* ---------- Hero ---------- */
.ds-hero {
  padding: 5rem 0 3rem;
  display: grid;
  gap: 3rem;
}

.ds-hero__title {
  font-size: clamp(2.4rem, 6.4vw, 5rem);
  line-height: 1;
  letter-spacing: -0.04em;
  font-weight: 650;
  color: var(--ink);
  max-width: 14ch;
  margin-top: 1rem;
  text-wrap: balance;
}

.ds-hero__title em {
  font-style: normal;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.ds-hero__lede {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  line-height: 1.55;
  max-width: 58ch;
  margin-top: 1.5rem;
}

.ds-meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--border-strong);
  border-bottom: 1px solid var(--border-strong);
}

.ds-meta > div {
  padding: 1.1rem 1.25rem 1.1rem 0;
}

.ds-meta > div + div {
  padding-left: 1.25rem;
  border-left: 1px solid var(--border);
}

.ds-meta dt {
  font-family: var(--mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
  margin-bottom: 0.35rem;
}

.ds-meta dd {
  font-size: 0.9rem;
  line-height: 1.45;
  color: var(--ink);
}

/* Specimen strip: one button, three postures */
.ds-specimens {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--border-strong);
  border-radius: 16px;
  overflow: hidden;
  background: var(--paper);
}

.ds-specimen {
  padding: 2rem 1.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  min-height: 230px;
}

.ds-specimen + .ds-specimen { border-left: 1px solid var(--border); }

.ds-specimen__stage {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ds-specimen__label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  font-size: 0.8rem;
}

.ds-specimen__label strong { color: var(--ink); font-size: 0.95rem; }
.ds-specimen__label span { font-family: var(--mono); font-size: 0.7rem; color: var(--text-3); text-align: right; }

.sp-magna {
  background: var(--violet);
  color: #fff;
  border-radius: 999px;
  padding: 0.95rem 2rem;
  font-size: 1rem;
  font-weight: 500;
  min-height: 48px;
  box-shadow: 0 6px 18px rgba(124, 58, 237, 0.25);
}

.sp-jedi {
  display: flex;
  gap: 0.375rem;
}

.sp-jedi span {
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  padding: 0.3rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--ink);
  background: #fff;
}

.sp-jedi span:first-child { border-color: var(--violet); color: var(--violet); }

.sp-web {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.6rem;
}

.sp-web b {
  font-size: 1.25rem;
  line-height: 1.15;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.sp-web span {
  background: var(--green);
  color: #fff;
  font-weight: 650;
  padding: 0.8rem 1.4rem;
  border-radius: 8px;
  font-size: 0.95rem;
}

.ds-caption {
  font-size: 0.8rem;
  color: var(--text-3);
  margin-top: 0.75rem;
}

/* ---------- Chapters ---------- */
.ds-chapter {
  padding: 5.5rem 0 1rem;
}

.ds-chapter__head {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: 1rem;
  align-items: baseline;
  margin-bottom: 2.25rem;
}

.ds-chapter__num {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--violet);
}

.ds-chapter__title {
  font-size: clamp(1.7rem, 3.6vw, 2.6rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  font-weight: 620;
  color: var(--ink);
  max-width: 24ch;
  text-wrap: balance;
}

.ds-prose {
  max-width: 64ch;
  margin-left: 6rem;
  font-size: 1.05rem;
  line-height: 1.7;
}

.ds-prose p + p { margin-top: 1rem; }
.ds-prose strong { color: var(--ink); font-weight: 600; }

/* Pull quote */
.ds-quote {
  margin: 3rem 0 0 6rem;
  padding-left: 1.5rem;
  border-left: 3px solid;
  border-image: var(--accent-grad) 1;
  font-size: clamp(1.25rem, 2.4vw, 1.65rem);
  line-height: 1.35;
  letter-spacing: -0.015em;
  color: var(--ink);
  max-width: 34ch;
}

/* ---------- Systems ---------- */
.ds-systems {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2.5rem;
}

.ds-system {
  border: 1px solid var(--border-strong);
  background: #fff;
  display: flex;
  flex-direction: column;
}

.ds-system--magna { border-radius: 28px; padding: 1.75rem; }
.ds-system--jedi { border-radius: 4px; padding: 1rem; font-size: 0.875rem; }
.ds-system--web { border-radius: 10px; padding: 1.5rem; border-top: 5px solid var(--green); }

.ds-system__name {
  font-size: 1.4rem;
  font-weight: 650;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.ds-system--jedi .ds-system__name { font-size: 1.1rem; }

.ds-system__for { font-size: 0.85rem; color: var(--text-3); margin-bottom: 1rem; }

.ds-system dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.5rem 1rem;
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}

.ds-system--jedi dl { gap: 0.25rem 0.75rem; font-size: 0.8rem; }

.ds-system dt { font-family: var(--mono); font-size: 0.7rem; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.05em; padding-top: 0.15rem; }
.ds-system dd { color: var(--ink); }

.ds-system__rule {
  margin-top: auto;
  padding-top: 1.25rem;
  font-size: 0.9rem;
  line-height: 1.5;
}

.ds-system__rule::before {
  content: 'Rule';
  display: block;
  font-family: var(--mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--violet);
  margin-bottom: 0.3rem;
}

/* Architecture: shared shell, independent engines */
.ds-arch {
  margin-top: 3rem;
  border: 1.5px dashed var(--border-strong);
  border-radius: 20px;
  padding: 1.5rem;
  background: var(--paper);
}

.ds-arch__shell {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.ds-arch__shell b {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
  margin-right: 0.5rem;
}

.ds-chip {
  font-family: var(--mono);
  font-size: 0.75rem;
  padding: 0.3rem 0.65rem;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--border-strong);
  color: var(--ink);
}

.ds-chip--ai { background: var(--violet-soft); border-color: rgba(124, 58, 237, 0.3); color: var(--violet); }

.ds-arch__engines {
  display: grid;
  grid-template-columns: repeat(3, 1fr) 0.8fr;
  gap: 0.75rem;
}

.ds-engine {
  background: #fff;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  padding: 1rem;
  font-size: 0.8rem;
}

.ds-engine strong { display: block; font-size: 1rem; color: var(--ink); }
.ds-engine span { font-family: var(--mono); color: var(--text-3); font-size: 0.72rem; }

.ds-engine--next {
  border-style: dashed;
  background: transparent;
  color: var(--text-3);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

/* ---------- Changelog timeline ---------- */
.ds-log {
  position: relative;
  margin-top: 1rem;
}

.ds-log::before {
  content: '';
  position: absolute;
  left: 2.45rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: var(--border-strong);
}

.ds-entry {
  position: relative;
  display: grid;
  grid-template-columns: 5rem minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 1rem 2.5rem;
  padding: 2.5rem 0;
}

.ds-entry + .ds-entry { border-top: 1px solid var(--border); }

.ds-ver {
  position: relative;
  z-index: 1;
  align-self: start;
  justify-self: center;
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: 0.25rem 0.6rem;
  color: var(--ink);
}

.ds-entry--win .ds-ver { background: var(--ink); color: #fff; border-color: var(--ink); }

.ds-entry__title {
  font-size: 1.35rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.ds-entry__body { font-size: 0.98rem; line-height: 1.65; }
.ds-entry__body p + p { margin-top: 0.85rem; }
.ds-entry__body strong { color: var(--ink); font-weight: 600; }

.ds-status {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

.ds-pill {
  font-family: var(--mono);
  font-size: 0.7rem;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  border: 1px solid currentColor;
}

.ds-pill--bad { color: var(--red); background: rgba(220, 38, 38, 0.05); }
.ds-pill--warn { color: var(--amber); background: rgba(180, 83, 9, 0.06); }
.ds-pill--good { color: var(--green-dark); background: rgba(22, 163, 74, 0.07); }

/* Code panel */
.ds-code {
  background: var(--code-bg);
  color: var(--code-text);
  border-radius: 14px;
  overflow: hidden;
  align-self: start;
  box-shadow: var(--shadow);
}

.ds-code__bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--code-dim);
}

.ds-meter {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.ds-meter i {
  display: block;
  width: 64px;
  height: 4px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.12);
  position: relative;
  overflow: hidden;
}

.ds-meter i::after {
  content: '';
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--fill, 0%);
  background: var(--accent-grad);
}

.ds-code pre {
  margin: 0;
  padding: 1rem 1.1rem 1.2rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.65;
  overflow-x: auto;
  white-space: pre;
}

.ds-code .k { color: var(--code-key); }
.ds-code .s { color: var(--code-str); }
.ds-code .n { color: var(--code-num); }
.ds-code .c { color: var(--code-dim); }
.ds-code .h { color: #fff; font-weight: 600; }
.ds-code .x { color: #fca5a5; }

/* ---------- Agent path diagram ---------- */
.ds-paths {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 2.5rem;
}

.ds-path {
  border: 1px solid var(--border-strong);
  border-radius: 16px;
  padding: 1.5rem;
  background: #fff;
}

.ds-path--after { background: var(--paper); border-color: rgba(22, 163, 74, 0.35); }

.ds-path__label {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
  margin-bottom: 1.25rem;
}

.ds-path--after .ds-path__label { color: var(--green-dark); }

.ds-flow {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.ds-node {
  font-family: var(--mono);
  font-size: 0.8rem;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 0.55rem 0.8rem;
  background: #fff;
  color: var(--ink);
  max-width: 100%;
}

.ds-node small { display: block; font-family: var(--font-sans); color: var(--text-3); font-size: 0.75rem; margin-top: 0.15rem; }
.ds-node--agent { background: var(--ink); color: #fff; border-color: var(--ink); }
.ds-node--far { opacity: 0.55; border-style: dashed; }
.ds-node--inner { border-color: rgba(22, 163, 74, 0.5); }

.ds-edge {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-3);
  padding: 0.4rem 0 0.4rem 1.1rem;
  margin-left: 0.9rem;
  border-left: 1.5px solid var(--border-strong);
}

.ds-edge--broken { border-left-style: dashed; color: var(--red); }
.ds-edge--ok { border-left-color: var(--green); color: var(--green-dark); }

.ds-nest {
  margin-top: 0.5rem;
  margin-left: 0.9rem;
  padding: 0.75rem;
  border: 1px solid rgba(22, 163, 74, 0.35);
  border-radius: 10px;
  display: grid;
  gap: 0.4rem;
  font-size: 0.8rem;
  background: #fff;
}

.ds-nest code { font-family: var(--mono); font-size: 0.75rem; color: var(--ink); }

/* ---------- Skill matrix ---------- */
.ds-matrix {
  margin-top: 2.5rem;
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  overflow: hidden;
}

.ds-matrix__row {
  display: grid;
  grid-template-columns: 11rem repeat(3, 1fr);
}

.ds-matrix__row + .ds-matrix__row { border-top: 1px solid var(--border); }

.ds-matrix__row > * {
  padding: 1rem 1.1rem;
  font-size: 0.85rem;
  line-height: 1.5;
}

.ds-matrix__row > * + * { border-left: 1px solid var(--border); }

.ds-matrix__head > * {
  background: var(--paper);
  font-weight: 600;
  color: var(--ink);
}

.ds-matrix__row > b {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-3);
  background: var(--paper);
}

.ds-matrix__never > *:not(b) { color: var(--red); }
.ds-matrix__never > *:not(b)::before { content: '✕ '; }

.ds-protocol {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin-top: 2rem;
  counter-reset: step;
  border-top: 1px solid var(--border-strong);
}

.ds-protocol li {
  list-style: none;
  padding: 1rem 1.25rem 0 0;
  font-size: 0.9rem;
  line-height: 1.5;
  counter-increment: step;
}

.ds-protocol li::before {
  content: '0' counter(step);
  display: block;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--violet);
  margin-bottom: 0.35rem;
}

.ds-protocol strong { display: block; color: var(--ink); }

/* ---------- Contract split ---------- */
.ds-contract {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 2.5rem;
  align-items: stretch;
}

.ds-prose-card {
  border: 1px dashed var(--border-strong);
  border-radius: 14px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.75rem;
  color: var(--text-3);
  font-size: 1.15rem;
  font-style: italic;
}

.ds-prose-card small { font-style: normal; font-family: var(--mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; }

/* ---------- Numbers ---------- */
.ds-numbers {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--border-strong);
  border-bottom: 1px solid var(--border-strong);
  margin-top: 1rem;
}

.ds-num { padding: 1.75rem 1.25rem 1.5rem 0; }
.ds-num + .ds-num { padding-left: 1.25rem; border-left: 1px solid var(--border); }

.ds-num b {
  display: block;
  font-size: clamp(2.2rem, 4.6vw, 3.4rem);
  line-height: 1;
  letter-spacing: -0.04em;
  font-weight: 600;
  color: var(--ink);
}

.ds-num span { display: block; font-size: 0.85rem; margin-top: 0.5rem; line-height: 1.4; }

.ds-audience {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.75rem;
  margin-top: 2.5rem;
}

.ds-aud {
  border-radius: 12px;
  background: var(--paper);
  border: 1px solid var(--border);
  padding: 1rem;
  font-size: 0.85rem;
  line-height: 1.5;
}

.ds-aud strong { display: block; color: var(--ink); margin-bottom: 0.3rem; }
.ds-aud--ai { background: var(--violet-soft); border-color: rgba(124, 58, 237, 0.25); }

/* ---------- Lessons ---------- */
.ds-lessons {
  display: grid;
  gap: 0;
  margin-top: 1rem;
}

.ds-lesson {
  display: grid;
  grid-template-columns: 6rem 1fr 1.1fr;
  gap: 1.5rem;
  padding: 2rem 0;
  border-top: 1px solid var(--border-strong);
  align-items: baseline;
}

.ds-lesson__n {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--violet);
}

.ds-lesson h3 {
  font-size: clamp(1.4rem, 2.8vw, 2rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--ink);
  font-weight: 620;
}

.ds-lesson p { font-size: 0.98rem; line-height: 1.65; }

.ds-end {
  margin: 4rem 0 5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--text-3);
}

.ds-end a { color: var(--violet); text-decoration: none; font-weight: 500; }
.ds-end a:hover { text-decoration: underline; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .ds-entry { grid-template-columns: 5rem minmax(0, 1fr); }
  .ds-entry .ds-code { grid-column: 2; }
  .ds-arch__engines { grid-template-columns: repeat(3, 1fr); }
  .ds-engine--next { grid-column: 1 / -1; padding: 0.6rem; }
  .ds-audience { grid-template-columns: repeat(3, 1fr); }
  .ds-protocol { grid-template-columns: repeat(2, 1fr); }
  .ds-lesson { grid-template-columns: 4rem 1fr; }
  .ds-lesson p { grid-column: 2; }
}

@media (max-width: 720px) {
  .ds { padding: 0 1rem; }
  .ds-hero { padding: 3rem 0 2rem; gap: 2rem; }
  .ds-meta { grid-template-columns: 1fr 1fr; }
  .ds-meta > div,
  .ds-meta > div + div { padding: 0.9rem 0.75rem 0.9rem 0; border-left: 0; }
  .ds-meta > div:nth-child(even) { padding-left: 0.75rem; border-left: 1px solid var(--border); }
  .ds-meta > div:nth-child(n + 3) { border-top: 1px solid var(--border); }

  .ds-specimens { grid-template-columns: 1fr; }
  .ds-specimen { min-height: 0; padding: 1.5rem 1.25rem 1.25rem; }
  .ds-specimen + .ds-specimen { border-left: 0; border-top: 1px solid var(--border); }

  .ds-chapter { padding-top: 4rem; }
  .ds-chapter__head { grid-template-columns: 1fr; gap: 0.5rem; margin-bottom: 1.5rem; }
  .ds-prose { margin-left: 0; font-size: 1rem; }
  .ds-quote { margin-left: 0; }

  .ds-systems,
  .ds-paths,
  .ds-contract { grid-template-columns: 1fr; }
  .ds-arch { padding: 1rem; }
  .ds-arch__engines { grid-template-columns: 1fr; }

  .ds-log::before { left: 1.6rem; }
  .ds-entry { grid-template-columns: 3.2rem minmax(0, 1fr); gap: 1rem; padding: 2rem 0; }
  .ds-ver { font-size: 0.72rem; padding: 0.2rem 0.45rem; }
  .ds-entry .ds-code { grid-column: 1 / -1; position: relative; z-index: 1; }

  .ds-matrix__head { display: none; }
  .ds-matrix__row { grid-template-columns: 1fr; }
  .ds-matrix__row > * + * { border-left: 0; border-top: 1px solid var(--border); }
  .ds-matrix__row > *:not(b)::before { content: attr(data-sys) ' · '; font-weight: 600; color: var(--ink); }
  .ds-matrix__never > *:not(b)::before { content: '✕ ' attr(data-sys) ' · '; color: var(--red); }

  .ds-protocol { grid-template-columns: 1fr; }
  .ds-numbers { grid-template-columns: 1fr 1fr; }
  .ds-num,
  .ds-num + .ds-num { padding: 1.25rem 0.75rem 1.25rem 0; border-left: 0; }
  .ds-num:nth-child(even) { padding-left: 0.75rem; border-left: 1px solid var(--border); }
  .ds-num:nth-child(n + 3) { border-top: 1px solid var(--border); }
  .ds-audience { grid-template-columns: 1fr 1fr; }
  .ds-lesson { grid-template-columns: 1fr; gap: 0.5rem; }
  .ds-lesson p { grid-column: auto; }
}