:root {
  --ink: #090909;
  --paper: #f7f7f4;
  --white: #ffffff;
  --muted: #696969;
  --line: #d9d9d4;
  --soft: #ecece7;
  --blue: #1557ff;
  --blue-dark: #0b35a8;
  --shadow: 0 24px 80px rgba(0, 0, 0, .11);
  --mono: "DM Mono", ui-monospace, monospace;
  --sans: "Manrope", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 1px 1px, rgba(9, 9, 9, .09) 1px, transparent 1.4px) 0 0 / 26px 26px,
    var(--paper);
  font-family: var(--sans);
  line-height: 1.6;
}

body::before {
  content: "";
  position: fixed;
  z-index: 20;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(rgba(255,255,255,0) 50%, rgba(0,0,0,.018) 50%);
  background-size: 100% 4px;
  mix-blend-mode: multiply;
}

a { color: inherit; }
img { max-width: 100%; display: block; }

.wrap {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
}

.topbar {
  position: sticky;
  z-index: 10;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: rgba(247, 247, 244, .9);
  backdrop-filter: blur(14px);
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  text-decoration: none;
  letter-spacing: -.03em;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  aspect-ratio: 1;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--white);
  font-family: var(--mono);
  font-size: 12px;
  box-shadow: 4px 4px 0 var(--blue);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .06em;
}

.nav-links a { text-decoration: none; }
.nav-links a:hover { color: var(--blue); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .72);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  margin: 0 auto;
  width: 20px;
  height: 2px;
  background: var(--ink);
  transition: transform .2s ease, opacity .2s ease;
}

.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--white);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: .05em;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}

.button:hover {
  transform: translate(-3px, -3px);
  box-shadow: 6px 6px 0 var(--blue);
}

.button.secondary { background: transparent; color: var(--ink); }

.hero {
  min-height: calc(100vh - 72px);
  display: grid;
  grid-template-columns: 1.08fr .92fr;
  align-items: center;
  gap: clamp(36px, 7vw, 90px);
  padding-block: 70px;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .09em;
}

.eyebrow::before {
  content: "";
  width: 44px;
  height: 3px;
  background: var(--blue);
}

h1, h2, h3, p { margin-top: 0; }

h1 {
  max-width: 760px;
  margin-bottom: 26px;
  font-size: clamp(55px, 7.2vw, 104px);
  line-height: .91;
  letter-spacing: -.075em;
}

h1 span {
  display: block;
  color: transparent;
  -webkit-text-stroke: 2px var(--ink);
}

.lede {
  max-width: 670px;
  margin-bottom: 34px;
  color: #3e3e3e;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.7;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }

.case-art { position: relative; isolation: isolate; }

.case-art::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: -18px 18px 18px -18px;
  border: 1px solid var(--ink);
  background: var(--blue);
}

.poster-frame {
  position: relative;
  border: 1px solid var(--ink);
  background: var(--white);
  padding: 10px;
  box-shadow: var(--shadow);
  transform: rotate(1.4deg);
}

.poster-frame img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  filter: contrast(1.02) saturate(.92);
}

.stamp {
  position: absolute;
  right: -22px;
  bottom: 34px;
  padding: 10px 14px;
  border: 3px double var(--blue);
  color: var(--blue);
  background: rgba(255, 255, 255, .92);
  font-family: var(--mono);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: .1em;
  transform: rotate(-7deg);
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--ink);
  background: var(--white);
  box-shadow: 8px 8px 0 var(--ink);
}

.stat {
  min-height: 150px;
  padding: 28px;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.stat:last-child { border-right: 0; }

.stat strong {
  font-size: clamp(32px, 4vw, 52px);
  line-height: 1;
  letter-spacing: -.06em;
}

.stat span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .07em;
}

section { padding-block: 110px; }

.section-head {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: 50px;
  align-items: end;
  margin-bottom: 52px;
}

.kicker {
  margin-bottom: 15px;
  color: var(--blue);
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .1em;
}

h2 {
  max-width: 720px;
  margin-bottom: 0;
  font-size: clamp(38px, 5vw, 64px);
  line-height: 1;
  letter-spacing: -.06em;
}

.section-intro {
  max-width: 620px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 18px;
}

.chapters {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.chapter {
  position: relative;
  min-height: 250px;
  padding: 28px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.88);
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}

.chapter:hover {
  z-index: 1;
  border-color: var(--ink);
  transform: translateY(-6px);
  box-shadow: 7px 7px 0 var(--blue);
}

.chapter-number {
  display: block;
  margin-bottom: 40px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
}

.chapter-date {
  display: block;
  margin-bottom: 10px;
  color: var(--blue);
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .06em;
}

.chapter h3 {
  margin-bottom: 10px;
  font-size: 24px;
  letter-spacing: -.04em;
}

.chapter p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
}

.stack-section {
  position: relative;
  overflow: hidden;
  color: var(--white);
  background: var(--ink);
}

.stack-section::after {
  content: "CRO LUCKNOW";
  position: absolute;
  right: -30px;
  bottom: -80px;
  color: rgba(255,255,255,.035);
  font-size: clamp(90px, 16vw, 260px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.09em;
  white-space: nowrap;
}

.stack-section .section-intro { color: #a9a9a9; }

.stack-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.stack-card {
  padding: 28px;
  border: 1px solid #292929;
  background: rgba(255,255,255,.03);
}

.stack-card .code {
  display: inline-grid;
  place-items: center;
  width: 38px;
  aspect-ratio: 1;
  margin-bottom: 20px;
  color: var(--ink);
  background: var(--blue);
  font-family: var(--mono);
  font-size: 12px;
}

.stack-card h3 {
  margin-bottom: 10px;
  font-size: 20px;
  letter-spacing: -.03em;
}

.stack-card p {
  margin-bottom: 0;
  color: #a9a9a9;
  font-size: 14.5px;
}

.use-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.use-card {
  padding: 34px;
  border: 1px solid var(--line);
  background: var(--white);
}

.use-card .code {
  display: inline-grid;
  place-items: center;
  width: 38px;
  aspect-ratio: 1;
  margin-bottom: 28px;
  color: var(--white);
  background: var(--ink);
  font-family: var(--mono);
  font-size: 12px;
}

.use-card .tag {
  display: inline-block;
  margin-bottom: 14px;
  color: var(--blue);
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .07em;
}

.use-card h3 { font-size: 24px; letter-spacing: -.04em; }
.use-card p { margin-bottom: 18px; color: var(--muted); }

.use-card .use-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.use-card a {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  text-decoration: none;
  color: var(--blue);
}

.use-card a:hover { text-decoration: underline; }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.skill-card {
  padding: 24px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.88);
}

.skill-card h3 {
  margin-bottom: 14px;
  color: var(--blue);
  font-family: var(--mono);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: .06em;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-list span {
  padding: 6px 10px;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .02em;
}

.achieve-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.achieve-card {
  padding: 28px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.88);
}

.achieve-card .kicker { margin-bottom: 10px; }

.achieve-card h3 {
  margin-bottom: 12px;
  font-size: 22px;
  letter-spacing: -.03em;
}

.achieve-card p { color: var(--muted); margin-bottom: 0; }
.achieve-card ul { margin: 0; padding-left: 18px; color: var(--muted); }
.achieve-card li { margin-bottom: 6px; }

.achieve-card a {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--blue);
  text-decoration: none;
}

.achieve-card a:hover { text-decoration: underline; }

.footprint {
  padding-block: 0 60px;
}

.cta { padding-block: 90px; }

.cta-box {
  position: relative;
  display: grid;
  grid-template-columns: 1.3fr .7fr;
  gap: 30px;
  align-items: center;
  overflow: hidden;
  padding: clamp(38px, 7vw, 80px);
  border: 1px solid var(--ink);
  background: var(--white);
  box-shadow: 12px 12px 0 var(--blue);
}

.cta-box::before {
  content: "";
  position: absolute;
  right: -70px;
  top: -70px;
  width: 220px;
  aspect-ratio: 1;
  border: 36px solid var(--soft);
  border-radius: 50%;
}

.cta-box h2 {
  max-width: 760px;
  font-size: clamp(38px, 5.5vw, 68px);
}

.cta-actions {
  position: relative;
  display: grid;
  gap: 12px;
}

footer {
  padding: 48px 0;
  border-top: 1px solid var(--line);
  background: var(--paper);
}

.footer-row {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .05em;
}

.footer-row a { color: var(--ink); text-decoration: none; }

@media (max-width: 900px) {
  .nav { position: relative; flex-wrap: wrap; }
  .nav-toggle { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0;
    background: var(--paper);
    border: 1px solid var(--line);
    border-top: none;
    box-shadow: 0 12px 24px rgba(9, 9, 9, .08);
  }

  .nav-links.is-open { display: flex; }

  .nav-links a:not(.button) {
    padding: 14px 24px;
    border-bottom: 1px solid var(--line);
  }

  .nav-links .button { margin: 4px 24px; justify-content: center; }

  .hero, .section-head, .cta-box { grid-template-columns: 1fr; }
  .hero { padding-top: 55px; }

  .case-art { width: min(420px, 92%); margin: 25px auto 0; }

  .stats, .chapters, .stack-grid, .skills-grid, .achieve-grid, .use-grid { grid-template-columns: repeat(2, 1fr); }

  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
}

@media (max-width: 620px) {
  .wrap { width: min(100% - 24px, 1180px); }
  .nav { min-height: 64px; }
  .brand span:last-child { display: none; }
  .nav .button { min-height: 40px; padding-inline: 14px; }

  h1 { font-size: clamp(51px, 16vw, 76px); }

  .hero { min-height: auto; padding-block: 52px 78px; }

  .stats, .chapters, .stack-grid, .use-grid, .skills-grid, .achieve-grid { grid-template-columns: 1fr; }

  .stat { min-height: 115px; border-right: 0; border-bottom: 1px solid var(--line); }
  .stat:last-child { border-bottom: 0; }

  section { padding-block: 78px; }

  .section-head { gap: 24px; margin-bottom: 36px; }

  .chapter { min-height: 210px; }

  .footer-row { flex-direction: column; }
}

/* ---------- Case study / article pages ---------- */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .05em;
}

.breadcrumb a { color: var(--blue); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

.case-hero { padding-block: 64px 0; }

.case-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  padding: 26px 0;
  margin: 36px 0 56px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.case-meta div {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
}

.case-meta strong {
  display: block;
  margin-top: 6px;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 700;
  text-transform: none;
  letter-spacing: normal;
}

.case-body { padding-block: 0 90px; }

.prose { max-width: 740px; }

.prose h2 {
  max-width: none;
  margin: 58px 0 18px;
  font-size: clamp(28px, 3.6vw, 42px);
  letter-spacing: -.035em;
  line-height: 1.05;
}

.prose h2:first-child { margin-top: 0; }

.prose h3 {
  margin: 36px 0 12px;
  font-size: 22px;
  letter-spacing: -.02em;
}

.prose p {
  margin-bottom: 20px;
  color: #2a2a2a;
  font-size: 17.5px;
  line-height: 1.78;
}

.prose ul, .prose ol {
  margin: 0 0 20px;
  padding-left: 22px;
  color: #2a2a2a;
  font-size: 17.5px;
  line-height: 1.78;
}

.prose li { margin-bottom: 8px; }
.prose strong { color: var(--ink); }
.prose a { color: var(--blue); text-decoration: underline; text-underline-offset: 3px; }

.pull-quote {
  margin: 46px 0;
  padding: 30px 34px;
  border-left: 4px solid var(--blue);
  background: rgba(255, 255, 255, .75);
  font-family: var(--mono);
  font-size: clamp(18px, 2.2vw, 21px);
  line-height: 1.55;
  letter-spacing: -.01em;
}

.case-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 18px;
  padding-top: 40px;
  margin-top: 30px;
  border-top: 1px solid var(--line);
}

.case-nav a {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--blue);
  text-decoration: none;
}

.case-nav a:hover { text-decoration: underline; }

.case-diagram {
  margin: 6px 0 50px;
  padding: 26px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.88);
  overflow-x: auto;
}

.case-diagram svg { display: block; margin: 0 auto; min-width: 640px; height: auto; }
.case-diagram figcaption {
  margin-top: 16px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: .07em;
}

.faq-list {
  max-width: 740px;
  margin-top: 24px;
  border-top: 1px solid var(--line);
}

.faq-item {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -.01em;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "+";
  flex: none;
  color: var(--blue);
  font-family: var(--mono);
  font-size: 20px;
}

.faq-item[open] summary::after { content: "\2013"; }

.faq-item p {
  margin: 14px 0 0;
  max-width: 680px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.75;
}

@media (max-width: 620px) {
  .case-meta { gap: 22px; }
  .prose p, .prose ul, .prose ol { font-size: 16.5px; }
  .case-diagram { padding: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}