@charset "UTF-8";
/* ==========================================================================
   Case study — long-form document layout. Extends style.css.
   ========================================================================== */

/* ---------- document hero ---------- */
.doc-hero {
  position: relative;
  padding: 140px 0 56px;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.doc-hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(143,164,188,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(143,164,188,.05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 90% at 20% 0%, #000 10%, transparent 72%);
  -webkit-mask-image: radial-gradient(ellipse 80% 90% at 20% 0%, #000 10%, transparent 72%);
  pointer-events: none;
}
.doc-hero__in { position: relative; z-index: 1; }

.back {
  display: flex; width: fit-content; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 12px; letter-spacing: .04em;
  color: var(--muted);
  margin-bottom: 30px;
  transition: color .2s var(--ease), gap .2s var(--ease);
}
.back:hover { color: var(--txt); gap: 11px; }

.doc-title {
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.03;
  letter-spacing: -.04em;
  max-width: 17ch;
}
.doc-sub {
  margin-top: 24px;
  font-size: 18px;
  line-height: 1.62;
  color: var(--txt-2);
  max-width: 640px;
}

.doc-meta {
  margin-top: 44px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}
.doc-meta__i { background: var(--bg-1); padding: 17px 20px; }
.doc-meta__k {
  font-family: var(--mono); font-size: 10px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--dim);
}
.doc-meta__v { margin-top: 7px; font-size: 15px; font-weight: 500; letter-spacing: -.01em; }

.disclosure {
  margin-top: 22px;
  display: flex;
  gap: 11px;
  padding: 14px 17px;
  border: 1px dashed var(--line-2);
  border-radius: var(--r);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  background: rgba(255,255,255,.012);
}
.disclosure svg { flex: none; margin-top: 2px; color: var(--dim); }

/* ---------- document body ---------- */
.doc {
  display: grid;
  grid-template-columns: 216px minmax(0, 1fr);
  gap: 56px;
  align-items: start;
  padding: 68px 0 96px;
}

.toc { position: sticky; top: 96px; }
.toc__l {
  font-family: var(--mono); font-size: 10px; letter-spacing: .13em;
  text-transform: uppercase; color: var(--dim);
  padding-bottom: 12px; border-bottom: 1px solid var(--line); margin-bottom: 12px;
}
.toc a {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 8px;
  padding: 7px 0;
  font-size: 13px;
  line-height: 1.4;
  color: var(--dim);
  transition: color .2s var(--ease);
}
.toc a span:first-child { font-family: var(--mono); font-size: 10.5px; padding-top: 2px; }
.toc a:hover { color: var(--txt-2); }
.toc a.is-active { color: var(--ember); }
.toc a.is-active span:first-child { color: var(--ember); }

.doc-body { max-width: 720px; }

.doc-sec { scroll-margin-top: 92px; }
.doc-sec + .doc-sec { margin-top: 72px; }

.doc-sec__n {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 11px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--ember);
  margin-bottom: 16px;
}
.doc-sec__n::after { content: ""; width: 26px; height: 1px; background: var(--line-2); }

.doc-sec h2 {
  font-size: clamp(24px, 3vw, 32px);
  letter-spacing: -.03em;
  line-height: 1.12;
}
.doc-sec h3 {
  margin-top: 36px;
  font-size: 17px;
  letter-spacing: -.015em;
  color: var(--txt);
}
.doc-sec p {
  margin-top: 18px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--txt-2);
}
.doc-sec p strong { color: var(--txt); font-weight: 500; }
.doc-sec p code, .ic {
  font-family: var(--mono); font-size: .88em;
  background: var(--bg-2); border: 1px solid var(--line);
  padding: 1px 5px; border-radius: 3px; color: var(--txt);
}

.doc-list { margin-top: 20px; display: flex; flex-direction: column; gap: 13px; }
.doc-list li {
  position: relative;
  padding-left: 24px;
  font-size: 15.5px; line-height: 1.68; color: var(--txt-2);
}
.doc-list li::before {
  content: "";
  position: absolute; left: 5px; top: 11px;
  width: 6px; height: 6px;
  background: var(--ember); transform: rotate(45deg);
}
.doc-list li strong { color: var(--txt); font-weight: 500; }

.doc-ol { margin-top: 20px; counter-reset: dol; display: flex; flex-direction: column; gap: 15px; }
.doc-ol li {
  counter-increment: dol;
  position: relative;
  padding-left: 42px;
  font-size: 15.5px; line-height: 1.68; color: var(--txt-2);
}
.doc-ol li::before {
  content: counter(dol);
  position: absolute; left: 0; top: 3px;
  width: 26px; height: 22px;
  font-family: var(--mono); font-size: 11px; color: var(--ember);
  border: 1px solid var(--line-2); border-radius: 3px;
  display: grid; place-items: center;
}
.doc-ol li strong { color: var(--txt); font-weight: 500; }

/* ---------- callouts ---------- */
.callout {
  margin-top: 28px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--co, var(--ember));
  border-radius: 0 var(--r) var(--r) 0;
  background: var(--bg-2);
}
.callout__k {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .13em;
  text-transform: uppercase; color: var(--co, var(--ember)); margin-bottom: 10px;
}
.callout p { margin-top: 0; font-size: 15px; line-height: 1.68; }
.callout p + p { margin-top: 12px; }

.pull {
  margin: 40px 0 4px;
  padding: 4px 0 4px 26px;
  border-left: 2px solid var(--gold);
  font-size: 21px;
  line-height: 1.48;
  letter-spacing: -.02em;
  color: var(--txt);
  font-weight: 500;
}

/* ---------- stats row ---------- */
.stat-row {
  margin-top: 30px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
}
.stat { background: var(--bg-1); padding: 18px 18px 20px; }
.stat__n {
  font-size: 24px; font-weight: 600; letter-spacing: -.03em;
  font-variant-numeric: tabular-nums; line-height: 1;
}
.stat__n em { font-style: normal; color: var(--ember); }
.stat__l {
  margin-top: 8px; font-family: var(--mono); font-size: 10px;
  letter-spacing: .07em; text-transform: uppercase; color: var(--dim); line-height: 1.5;
}

/* ---------- decision blocks ---------- */
.options { margin-top: 26px; display: flex; flex-direction: column; gap: 12px; }
.opt {
  display: grid;
  grid-template-columns: 108px minmax(0,1fr);
  gap: 20px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--bg-2);
}
.opt--picked { border-color: color-mix(in srgb, var(--ok) 45%, transparent); background: rgba(63,185,132,.045); }
.opt__t { font-size: 14px; font-weight: 500; }
.opt__v {
  margin-top: 7px; font-family: var(--mono); font-size: 10px;
  letter-spacing: .1em; text-transform: uppercase; color: var(--dim);
}
.opt--picked .opt__v { color: var(--ok); }
.opt__d { font-size: 14.5px; line-height: 1.62; color: var(--muted); }

/* ---------- risk table ---------- */
.tbl-wrap { margin-top: 26px; overflow-x: auto; -webkit-overflow-scrolling: touch; border: 1px solid var(--line); border-radius: var(--r); }
table.tbl { width: 100%; border-collapse: collapse; min-width: 560px; }
table.tbl th, table.tbl td {
  text-align: left; padding: 14px 18px; font-size: 14px; line-height: 1.55;
  border-bottom: 1px solid var(--line); vertical-align: top;
}
table.tbl thead th {
  background: var(--bg-1);
  font-family: var(--mono); font-size: 10px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--dim); font-weight: 500;
}
table.tbl tbody tr:last-child td { border-bottom: 0; }
table.tbl td:first-child { color: var(--txt); font-weight: 500; width: 32%; }
table.tbl td { color: var(--txt-2); }
.sev { font-family: var(--mono); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; padding: 2px 7px; border-radius: 3px; border: 1px solid; white-space: nowrap; }
.sev--h { color: var(--err); border-color: color-mix(in srgb, var(--err) 45%, transparent); background: rgba(229,72,77,.08); }
.sev--m { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 45%, transparent); background: rgba(224,169,59,.08); }

/* ---------- architecture diagram ---------- */
.diagram {
  margin-top: 30px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--bg-1);
  overflow: hidden;
}
.diagram__bar {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  padding: 11px 16px; border-bottom: 1px solid var(--line);
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--dim);
}
.diagram__body { padding: 24px 20px; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.diagram__body svg { min-width: 620px; }
.diagram__cap {
  padding: 12px 16px; border-top: 1px solid var(--line);
  font-size: 13px; color: var(--muted); line-height: 1.6;
}

/* ---------- phase timeline ---------- */
.phases { margin-top: 30px; display: flex; flex-direction: column; }
.phase {
  display: grid;
  grid-template-columns: 90px 22px minmax(0,1fr);
  gap: 18px;
  padding-bottom: 26px;
  position: relative;
}
.phase:last-child { padding-bottom: 0; }
.phase__when { font-family: var(--mono); font-size: 11.5px; color: var(--muted); padding-top: 1px; letter-spacing: .03em; }
.phase__rail { position: relative; display: flex; justify-content: center; }
.phase__rail::before {
  content: ""; position: absolute; top: 14px; bottom: -26px; width: 1px; background: var(--line);
}
.phase:last-child .phase__rail::before { display: none; }
.phase__dot {
  width: 9px; height: 9px; border-radius: 50%; margin-top: 5px;
  background: var(--bg); border: 1.5px solid var(--pd, var(--line-2)); z-index: 1;
}
.phase--done .phase__dot { background: var(--ok); border-color: var(--ok); }
.phase--now .phase__dot  { background: var(--ember); border-color: var(--ember); box-shadow: 0 0 0 4px rgba(255,92,56,.16); }
.phase__t { font-size: 15px; font-weight: 500; }
.phase__d { margin-top: 7px; font-size: 14.5px; line-height: 1.62; color: var(--muted); }
.phase__tag {
  display: inline-block; margin-top: 9px;
  font-family: var(--mono); font-size: 10px; letter-spacing: .1em; text-transform: uppercase;
  padding: 2px 7px; border-radius: 3px; border: 1px solid var(--line-2); color: var(--dim);
}
.phase--now .phase__tag { color: var(--ember); border-color: color-mix(in srgb, var(--ember) 45%, transparent); }
.phase--done .phase__tag { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, transparent); }

/* ---------- next steps / cta ---------- */
.doc-cta {
  margin-top: 76px;
  padding: 40px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--bg-1);
  position: relative;
  overflow: hidden;
}
.doc-cta::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 1px;
  background: linear-gradient(90deg, var(--bronze), var(--silver), var(--gold));
  opacity: .6;
}
.doc-cta h2 { font-size: 26px; letter-spacing: -.03em; }
.doc-cta p { margin-top: 14px; font-size: 15.5px; line-height: 1.68; color: var(--txt-2); max-width: 540px; }
.doc-cta__actions { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 12px; }

@media (max-width: 1000px) {
  .doc { grid-template-columns: 1fr; gap: 34px; padding-top: 44px; }
  .toc {
    position: static;
    display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 2px 20px;
    padding-bottom: 22px; border-bottom: 1px solid var(--line);
  }
  .toc__l { grid-column: 1 / -1; }
  .doc-meta { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .doc-hero { padding: 112px 0 44px; }
  .doc-sec + .doc-sec { margin-top: 56px; }
  .opt { grid-template-columns: 1fr; gap: 8px; }
  .doc-cta { padding: 28px 22px; }
  .phase { grid-template-columns: 74px 20px minmax(0,1fr); gap: 12px; }
}