/* ============================================
     Case study extensions — same monochrome spirit
     ============================================ */

  /* Project hero */
  .cs-hero { padding: 110px 0 80px; }
  .cs-hero .eyebrow-row {
    display: flex; gap: 16px; align-items: center;
    margin-bottom: 40px;
    font-size: 13px; color: var(--muted);
  }
  .cs-hero .eyebrow-row .sep {
    width: 24px; height: 1px; background: var(--line);
  }
  .cs-hero h1 {
    font-weight: 400;
    font-size: clamp(40px, 6.5vw, 80px);
    line-height: 1.05;
    letter-spacing: -0.035em;
    max-width: 900px;
  }
  .cs-hero h1 .accent { color: var(--muted); }
  .cs-hero-sub {
    margin-top: 36px;
    max-width: 620px;
    font-size: 18px;
    line-height: 1.55;
    color: var(--ink-soft);
  }
  .cs-meta {
    margin-top: 56px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    padding-top: 36px;
    border-top: 1px solid var(--line);
  }
  .cs-meta-item .k {
    font-size: 12px; color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 10px;
  }
  .cs-meta-item .v {
    font-size: 15px; color: var(--ink);
    line-height: 1.45;
  }

  /* Pillars grid (scope cards) */
  .pillars {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
  }
  .pillar {
    padding: 32px 28px;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    transition: background 0.25s ease;
  }
  .pillar:hover { background: var(--hover); }
  .pillar .idx {
    font-size: 12px; color: var(--muted);
    letter-spacing: 0.06em;
    margin-bottom: 18px;
  }
  .pillar h4 {
    font-size: 20px;
    font-weight: 400;
    letter-spacing: -0.02em;
    margin-bottom: 14px;
  }
  .pillar ul {
    list-style: none;
    font-size: 13.5px;
    line-height: 1.65;
    color: var(--ink-soft);
  }
  .pillar ul li {
    padding-left: 14px;
    position: relative;
  }
  .pillar ul li::before {
    content: "";
    position: absolute;
    left: 0; top: 11px;
    width: 5px; height: 1px;
    background: var(--muted);
  }

  /* Segments grid */
  .segments-block { display: grid; grid-template-columns: 200px 1fr; gap: 60px; }
  .segments-block .seg-label { font-size: 13px; color: var(--muted); line-height: 1.6; }
  .segments-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0;
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
  }
  .segment {
    padding: 28px;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }
  .segment .num {
    font-size: 12px; color: var(--muted);
    letter-spacing: 0.06em;
    margin-bottom: 14px;
  }
  .segment h5 {
    font-size: 18px;
    font-weight: 400;
    letter-spacing: -0.015em;
    margin-bottom: 10px;
  }
  .segment p {
    font-size: 13.5px; color: var(--ink-soft); line-height: 1.6;
  }
  .segments-pair {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    margin-top: 12px;
  }
  .segments-pair .side-title {
    font-size: 13px; color: var(--muted);
    letter-spacing: 0.06em; text-transform: uppercase;
    margin-bottom: 20px;
    display: flex; align-items: center; gap: 12px;
  }
  .segments-pair .side-title::after {
    content: ""; flex: 1; height: 1px; background: var(--line);
  }

  /* Persona cards */
  .personas {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .persona {
    border: 1px solid var(--line);
    padding: 36px 32px;
    transition: border-color 0.25s ease;
  }
  .persona:hover { border-color: var(--ink); }
  .persona .top {
    display: flex; justify-content: space-between;
    align-items: baseline;
    padding-bottom: 22px;
    border-bottom: 1px solid var(--line);
    margin-bottom: 22px;
  }
  .persona .name {
    font-size: 26px;
    font-weight: 400;
    letter-spacing: -0.025em;
  }
  .persona .age {
    font-size: 13px; color: var(--muted);
  }
  .persona .role-line {
    font-size: 13px; color: var(--muted);
    margin-bottom: 4px;
  }
  .persona .quote {
    font-size: 16px;
    color: var(--ink);
    font-style: italic;
    margin-bottom: 24px;
    line-height: 1.45;
    letter-spacing: -0.005em;
  }
  .persona .block-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .persona .pblock h6 {
    font-size: 12px;
    color: var(--muted);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 10px;
    font-weight: 500;
  }
  .persona .pblock p {
    font-size: 13.5px;
    line-height: 1.6;
    color: var(--ink-soft);
  }
  .persona .pblock ul {
    list-style: none;
    font-size: 13.5px;
    line-height: 1.7;
    color: var(--ink-soft);
  }
  .persona .pblock ul li {
    padding-left: 14px;
    position: relative;
  }
  .persona .pblock ul li::before {
    content: ""; position: absolute;
    left: 0; top: 11px;
    width: 5px; height: 1px;
    background: var(--muted);
  }

  /* Empathy map */
  .empathy-intro {
    font-size: 14px;
    color: var(--ink-soft);
    line-height: 1.6;
    margin-bottom: 28px;
    max-width: 720px;
  }
  .empathy-map {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0;
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
  }
  .empathy-quad {
    padding: 32px 28px;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    min-height: 200px;
  }
  .empathy-quad .label {
    font-size: 12px;
    color: var(--muted);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 18px;
    font-weight: 500;
  }
  .empathy-quad ul {
    list-style: none;
    font-size: 14px;
    line-height: 1.6;
    color: var(--ink-soft);
  }
  .empathy-quad ul li {
    padding-left: 14px;
    position: relative;
    margin-bottom: 6px;
  }
  .empathy-quad ul li::before {
    content: ""; position: absolute;
    left: 0; top: 11px;
    width: 5px; height: 1px;
    background: var(--muted);
  }

  /* Research observations */
  .research {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0;
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
  }
  .research-item {
    padding: 26px 28px;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }
  .research-item .k {
    font-size: 13px;
    color: var(--ink);
    margin-bottom: 8px;
    font-weight: 500;
    letter-spacing: -0.01em;
  }
  .research-item .v {
    font-size: 13.5px;
    color: var(--ink-soft);
    line-height: 1.55;
  }

  /* Design rules */
  .rules-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
  }
  .rule {
    padding: 30px 28px;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }
  .rule .n {
    font-size: 13px; color: var(--muted); margin-bottom: 16px;
  }
  .rule h5 {
    font-size: 19px;
    font-weight: 400;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
  }
  .rule p {
    font-size: 13.5px;
    color: var(--ink-soft);
    line-height: 1.55;
  }

  /* Task flow chips */
  .flow-block { margin-top: 24px; }
  .flow-title {
    font-size: 13px;
    color: var(--muted);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 22px;
    display: flex; align-items: center; gap: 12px;
  }
  .flow-title::after {
    content: ""; flex: 1; height: 1px; background: var(--line);
  }
  .flow-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
  }
  .flow-chip {
    font-size: 13px;
    padding: 9px 16px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--ink);
    background: var(--bg);
    white-space: nowrap;
    transition: all 0.2s ease;
  }
  .flow-chip:hover {
    border-color: var(--ink);
    transform: translateY(-1px);
  }
  .flow-arrow {
    color: var(--muted);
    font-size: 12px;
    user-select: none;
  }

  /* UI Kit */
  .uikit-grid {
    display: grid;
    grid-template-columns: 1.1fr 1fr 1fr;
    gap: 0;
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
  }
  .uikit-col {
    padding: 30px 28px;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }
  .uikit-col .label {
    font-size: 12px;
    color: var(--muted);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 20px;
  }
  .type-row {
    display: flex; align-items: baseline;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--line);
  }
  .type-row:last-child { border-bottom: none; }
  .type-row .aa {
    font-size: 22px;
    letter-spacing: -0.02em;
    color: var(--ink);
  }
  .type-row .aa.lato { font-family: "Lato", "Geist", sans-serif; }
  .type-row .aa.roboto { font-family: "Roboto", "Geist", sans-serif; }
  .type-row .aa.bold { font-weight: 600; }
  .type-row .aa.italic { font-style: italic; }
  .type-row .aa.light { font-weight: 300; }
  .type-row .name {
    font-size: 12px; color: var(--muted);
  }
  .swatches {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }
  .swatch {
    display: flex;
    flex-direction: column;
    gap: 6px;
  }
  .swatch .chip {
    width: 100%; aspect-ratio: 5/2;
    border: 1px solid var(--line);
  }
  .swatch .nm {
    font-size: 11.5px;
    color: var(--ink-soft);
    letter-spacing: -0.005em;
  }
  .icons-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px 10px;
    margin-top: 4px;
  }
  .icon-tile {
    display: flex; flex-direction: column;
    align-items: center; gap: 8px;
    padding: 10px 6px;
    border: 1px solid var(--line);
    border-radius: 4px;
    transition: background 0.2s ease;
  }
  .icon-tile:hover { background: var(--hover); }
  .icon-tile svg { width: 32px; height: 22px; color: var(--ink); }
  .icon-tile .nm {
    font-size: 10.5px;
    color: var(--ink-soft);
    text-align: center;
    line-height: 1.2;
    letter-spacing: -0.005em;
  }

  /* Mockup gallery */
  .mocks {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }
  .mock {
    border: 1px solid var(--line);
    background: var(--hover);
    padding: 24px 16px 18px;
    transition: all 0.25s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  .mock:hover {
    border-color: var(--ink);
    transform: translateY(-4px);
  }
  .mock img {
    width: 100%;
    max-width: 240px;
    height: auto;
    display: block;
    border-radius: 6px;
    box-shadow: 0 12px 32px -16px rgba(0,0,0,0.18);
  }
  .mock .cap {
    margin-top: 18px;
    font-size: 12.5px;
    color: var(--ink-soft);
    text-align: center;
    line-height: 1.4;
  }
  .mock .cap-num {
    font-size: 11px;
    color: var(--muted);
    letter-spacing: 0.06em;
    display: block;
    margin-bottom: 4px;
  }

  /* Feature mockup (wider, full bleed feel) */
  .feature-mock {
    margin-top: 64px;
    padding: 64px 0;
    background: var(--hover);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }
  .feature-mock .feature-inner {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 80px;
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 40px;
  }
  .feature-mock .copy .eyebrow {
    font-size: 12px;
    color: var(--muted);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 22px;
  }
  .feature-mock .copy h3 {
    font-size: clamp(28px, 3.4vw, 40px);
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -0.025em;
    margin-bottom: 22px;
    color: var(--ink);
  }
  .feature-mock .copy p {
    font-size: 15.5px;
    color: var(--ink-soft);
    line-height: 1.6;
    max-width: 460px;
  }
  .feature-mock .device {
    display: flex;
    justify-content: center;
  }
  .feature-mock .device img {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 24px 60px -24px rgba(0,0,0,0.25);
  }

  /* Reveal animation */
  .reveal {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 0.7s ease, transform 0.7s ease;
  }
  .reveal.in {
    opacity: 1;
    transform: translateY(0);
  }
  .reveal-stagger > * {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  .reveal-stagger.in > * { opacity: 1; transform: translateY(0); }
  .reveal-stagger.in > *:nth-child(1) { transition-delay: 0.04s; }
  .reveal-stagger.in > *:nth-child(2) { transition-delay: 0.10s; }
  .reveal-stagger.in > *:nth-child(3) { transition-delay: 0.16s; }
  .reveal-stagger.in > *:nth-child(4) { transition-delay: 0.22s; }
  .reveal-stagger.in > *:nth-child(5) { transition-delay: 0.28s; }
  .reveal-stagger.in > *:nth-child(6) { transition-delay: 0.34s; }
  .reveal-stagger.in > *:nth-child(7) { transition-delay: 0.40s; }
  .reveal-stagger.in > *:nth-child(8) { transition-delay: 0.46s; }
  .reveal-stagger.in > *:nth-child(9) { transition-delay: 0.52s; }
  .reveal-stagger.in > *:nth-child(n+10) { transition-delay: 0.58s; }

  /* Outcome strip */
  .outcome-strip {
    margin-top: 72px;
    padding-top: 48px;
    border-top: 1px solid var(--line);
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 60px;
    align-items: baseline;
  }
  .outcome-strip .label {
    font-size: 13px;
    color: var(--muted);
  }
  .outcome-strip .copy {
    font-size: 20px;
    line-height: 1.5;
    color: var(--ink);
    max-width: 680px;
    letter-spacing: -0.015em;
    font-weight: 400;
  }

  /* Responsive */
  @media (max-width: 1024px) {
    .pillars { grid-template-columns: repeat(2, 1fr); }
    .rules-grid { grid-template-columns: repeat(2, 1fr); }
    .uikit-grid { grid-template-columns: 1fr; }
    .mocks { grid-template-columns: repeat(2, 1fr); }
    .feature-mock .feature-inner { grid-template-columns: 1fr; gap: 40px; }
    .feature-mock .device img { max-width: 260px; }
    .cs-meta { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  }
  @media (max-width: 760px) {
    .cs-hero { padding: 60px 0 50px; }
    .pillars, .segments-grid, .research, .empathy-map, .rules-grid { grid-template-columns: 1fr; }
    .personas { grid-template-columns: 1fr; gap: 20px; }
    .segments-block { grid-template-columns: 1fr; gap: 24px; }
    .segments-pair { grid-template-columns: 1fr; gap: 36px; }
    .mocks { grid-template-columns: 1fr; gap: 16px; }
    .mock img { max-width: 260px; }
    .outcome-strip { grid-template-columns: 1fr; gap: 16px; }
    .outcome-strip .copy { font-size: 18px; }
    .feature-mock { padding: 44px 0; }
    .feature-mock .feature-inner { padding: 0 24px; }
    .cs-meta { grid-template-columns: 1fr 1fr; gap: 24px; }
    .flow-chips { gap: 6px; }
    .flow-chip { font-size: 12px; padding: 7px 12px; }
    .icons-row { grid-template-columns: repeat(3, 1fr); }
  }
/* ===== UNIFORM SITE TYPOGRAPHY ===== */
body { font-family: var(--font); }
h1, h2, h3,
.hero h1,
.cs-hero h1,
.block h2,
.cs-block h2,
.contact h2,
.cs-contact h2,
.stat-num,
.result-num,
.res-num {
  font-family: var(--serif);
  font-weight: 400;
}
.logo,
.nav-links,
.eyebrow,
.eyebrow-row,
.pill,
.tag,
.meta,
.stat-label,
.stats-label,
.result-label,
.contact-eyebrow,
.cs-contact-eyebrow,
.footer-links,
.cs-footer-links {
  font-family: var(--mono);
}
.site-identity {
  padding: 34px 0 0;
}
.site-name {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(22px, 3vw, 34px);
  letter-spacing: -0.015em;
  line-height: 1;
}
.site-availability {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 100px;
  padding: 7px 15px;
  margin-top: 20px;
}
.site-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #000;
}