/* ============================================================
   KAI KASH PORTFOLIO — Design System
   Fonts: Afacad (display) · Rubik (body) · Material Symbols Rounded
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Afacad:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500&family=Rubik:wght@300;400;500;600&family=Material+Symbols+Rounded:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200&display=swap');

/* ── Tokens ─────────────────────────────────────────────────── */
:root {
  --bg:       #fafaf8;
  --surface:  #f4f3ef;
  --ink:      #141412;
  --ink-2:    #3d3d38;
  --ink-3:    #78786e;
  --ink-4:    #737368;
  --line:     #e4e3dc;
  --accent:   #1a1a18;
  --chip-bg:  #eeede8;

  --f-display: 'Afacad', sans-serif;
  --f-body:    'Rubik', sans-serif;

  --max-w:    1120px;
  --ease:     cubic-bezier(.4,0,.2,1);

  font-size: 16px;
}

/* ── Reset ───────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--f-body);
  font-weight: 400;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ── Icon utility ────────────────────────────────────────────── */
.icon {
  font-family: 'Material Symbols Rounded';
  font-variation-settings: 'FILL' 0, 'wght' 300, 'GRAD' 0, 'opsz' 24;
  font-size: 20px;
  line-height: 1;
  vertical-align: middle;
  user-select: none;
}
.icon-filled {
  font-variation-settings: 'FILL' 1, 'wght' 300, 'GRAD' 0, 'opsz' 24;
}

/* ── Navigation ─────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250,250,248,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--f-display);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--ink);
}
.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}
.nav-links a {
  font-family: var(--f-body);
  font-size: .875rem;
  font-weight: 400;
  color: var(--ink-3);
  transition: color .2s;
}
.nav-links a:hover { color: var(--ink); }
.nav-links .nav-cta {
  font-weight: 500;
  color: var(--ink);
  background: var(--chip-bg);
  padding: 6px 16px;
  border-radius: 100px;
  border: 1px solid var(--line);
  transition: background .2s, border-color .2s;
}
.nav-links .nav-cta:hover { background: var(--line); }

/* ── Hero ────────────────────────────────────────────────────── */
.hero {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 96px 32px 80px;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .8rem;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 24px;
}
.hero-eyebrow::before {
  content: '';
  width: 20px;
  height: 1px;
  background: var(--ink-4);
  display: block;
}
.hero-headline {
  font-family: var(--f-display);
  font-size: clamp(2.6rem, 5vw, 4rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -.03em;
  color: var(--ink);
  max-width: 720px;
  margin-bottom: 28px;
}
.hero-headline .rotating-word {
  display: inline-block;
  color: var(--ink-3);
  min-width: 4px;
  transition: opacity .3s var(--ease), transform .3s var(--ease);
}
.hero-headline .rotating-word.exiting {
  opacity: 0;
  transform: translateY(-8px);
}
.hero-headline .rotating-word.entering {
  opacity: 0;
  transform: translateY(8px);
}
.hero-sub {
  font-size: 1.05rem;
  color: var(--ink-2);
  max-width: 580px;
  line-height: 1.7;
  margin-bottom: 40px;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--f-body);
  font-size: .875rem;
  font-weight: 500;
  padding: 10px 22px;
  border-radius: 100px;
  border: 1px solid var(--line);
  transition: background .2s, border-color .2s, color .2s;
  cursor: pointer;
}
.btn-primary {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.btn-primary:hover { background: var(--ink-2); border-color: var(--ink-2); }
.btn-secondary {
  background: transparent;
  color: var(--ink);
}
.btn-secondary:hover { background: var(--chip-bg); }

/* ── Case Study Grid ─────────────────────────────────────────── */
.work-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px 120px;
}
.section-label {
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 40px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}
.case-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 2px;
}

/* ── Case Card ───────────────────────────────────────────────── */
.case-card {
  position: relative;
  background: var(--surface);
  border-radius: 2px;
  overflow: hidden;
  cursor: pointer;
  transition: transform .3s var(--ease);
  display: block;
  color: var(--ink);
  text-decoration: none;
  margin-bottom:20px;
}
.case-card:hover { transform: translateY(-2px); }
.case-card:hover .case-thumb img { transform: scale(1.02); }
.case-thumb {
  overflow: hidden;
  position: relative;
  background: var(--surface);
}
.case-thumb img {
  width: 70%;
  object-fit: fill;
  margin:auto;
  transition: transform .6s var(--ease);
}

.cs4  {
    margin: auto;
    width: 40% !important;
}
.case-body {
  padding: 28px 28px 32px;
}
.lock-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--f-body);
  font-size: .72rem;
  font-weight: 500;
  color: var(--ink-3);
  background: var(--chip-bg);
  border: 1px solid var(--line);
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 14px;
}
.lock-badge .icon { font-size: 14px; }
.case-company {
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 8px;
}
.case-title {
  font-family: var(--f-display);
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -.02em;
  color: var(--ink);
  margin-bottom: 12px;
}
.case-desc {
  font-size: .9rem;
  color: var(--ink-3);
  line-height: 1.6;
  margin-bottom: 20px;
}
.case-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 24px;
}
.tag {
  font-size: .72rem;
  font-weight: 500;
  color: var(--ink-2);
  background: var(--chip-bg);
  border: 1px solid var(--line);
  padding: 4px 10px;
  border-radius: 100px;
}
.case-metrics {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  margin-bottom: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.metric { }
.metric-val {
  font-family: var(--f-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1;
}
.metric-label {
  font-size: .72rem;
  color: var(--ink-4);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: .06em;
}
.case-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .85rem;
  font-weight: 500;
  color: var(--ink);
  transition: gap .2s;
}
.case-card:hover .case-cta { gap: 10px; }

/* ── Why Me Section ──────────────────────────────────────────── */
.why-section {
  background: var(--surface);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.why-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 80px 32px;
}
.why-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-bottom: 64px;
  align-items: end;
}
.why-headline {
  font-family: var(--f-display);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 600;
  letter-spacing: -.03em;
  line-height: 1.15;
}
.why-desc {
  font-size: .95rem;
  color: var(--ink-2);
  line-height: 1.7;
}
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
}
.why-card {
  background: var(--bg);
  padding: 32px;
}
.why-icon {
  font-size: 24px;
  margin-bottom: 16px;
  color: var(--ink-2);
}
.why-card-title {
  font-family: var(--f-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.why-card-text {
  font-size: .875rem;
  color: var(--ink-3);
  line-height: 1.65;
}

/* ── Footer ─────────────────────────────────────────────────── */
.footer {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 48px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--line);
}
.footer-name {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: 1rem;
}
.footer-meta {
  font-size: .8rem;
  color: var(--ink-4);
}
.footer-links {
  display: flex;
  gap: 20px;
}
.footer-links a {
  font-size: .8rem;
  color: var(--ink-3);
  transition: color .2s;
}
.footer-links a:hover { color: var(--ink); }

/* ── PASSWORD GATE ───────────────────────────────────────────── */
.pw-gate {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  transition: opacity .5s var(--ease);
}
.pw-gate.unlocking {
  opacity: 0;
  pointer-events: none;
}
.pw-card {
  width: 100%;
  max-width: 440px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 48px 40px;
  text-align: center;
}
.pw-gate-back {
  position: absolute;
  top: 24px;
  left: 32px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .85rem;
  color: var(--ink-3);
  transition: color .2s;
}
.pw-gate-back:hover { color: var(--ink); }
.pw-lock-icon {
  font-size: 32px;
  color: var(--ink-3);
  margin-bottom: 20px;
}
.pw-company {
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 8px;
}
.pw-title {
  font-family: var(--f-display);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -.02em;
  margin-bottom: 12px;
}
.pw-note {
  font-size: .85rem;
  color: var(--ink-3);
  line-height: 1.6;
  margin-bottom: 32px;
}
.pw-note a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.pw-form { position: relative; margin-bottom: 12px; }
.pw-input {
  width: 100%;
  padding: 13px 48px 13px 18px;
  font-family: var(--f-body);
  font-size: .9rem;
  color: var(--ink);
  background: var(--bg);
  border: 1.5px solid var(--line);
  border-radius: 10px;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
  text-align: center;
  letter-spacing: .04em;
}
.pw-input:focus { border-color: var(--ink-3); box-shadow: 0 0 0 3px rgba(20,20,18,.06); }
.pw-input.error { border-color: #d0412a; box-shadow: 0 0 0 3px rgba(208,65,42,.08); }
.pw-toggle {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--ink-4);
  line-height: 1;
  padding: 2px;
}
.pw-toggle:hover { color: var(--ink-2); }
.pw-error {
  font-size: .8rem;
  color: #d0412a;
  margin-bottom: 16px;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity .25s, transform .25s;
}
.pw-error.visible { opacity: 1; transform: translateY(0); }
.pw-submit {
  width: 100%;
  padding: 13px;
  background: var(--ink);
  color: var(--bg);
  border: none;
  border-radius: 10px;
  font-family: var(--f-body);
  font-size: .9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background .2s;
}
.pw-submit:hover { background: var(--ink-2); }
.pw-success-check {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: .9rem;
  color: #2a7a4e;
  margin-top: 12px;
  opacity: 0;
  transition: opacity .3s;
}
.pw-success-check.visible { opacity: 1; }
.page-protected { display: none; }
.page-protected.unlocked { display: block; }

/* ── Case Study Page ─────────────────────────────────────────── */
.cs-hero {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 72px 32px 0;
}
.cs-company-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-4);
  background: var(--chip-bg);
  border: 1px solid var(--line);
  padding: 5px 14px;
  border-radius: 100px;
  margin-bottom: 24px;
}
.cs-title {
  font-family: var(--f-display);
  font-size: clamp(2.2rem, 4.5vw, 3.5rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -.03em;
  color: var(--ink);
  max-width: 780px;
  margin-bottom: 32px;
}
.cs-meta-strip {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 0;
}
.cs-meta-item {}
.cs-meta-label {
  font-size: .7rem;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 4px;
}
.cs-meta-val {
  font-family: var(--f-display);
  font-size: .95rem;
  font-weight: 500;
  color: var(--ink);
}

/* Hero image full-bleed */
.cs-hero-img {
  max-width: var(--max-w);
  margin: 40px auto 0;
  padding: 0 32px;
}
.cs-hero-img img {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--line);
}

/* Body layout: single column, sidebar inline above content */
.cs-body {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 48px 32px 100px;
  display: grid;
  grid-template-columns: 1fr;
}
.cs-sidebar {
  margin-bottom: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}
.cs-sidebar-sticky {
  position: static;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 24px 40px;
}
.cs-sidebar-section {
  margin-bottom: 36px;
}
.cs-sidebar-label {
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 10px;
}
.cs-sidebar-val {
  font-size: .88rem;
  color: var(--ink-2);
  line-height: 1.6;
}
.cs-sidebar-tag {
  display: inline-block;
  font-size: .72rem;
  color: var(--ink-2);
  background: var(--chip-bg);
  border: 1px solid var(--line);
  padding: 3px 10px;
  border-radius: 100px;
  margin: 2px 2px 2px 0;
}

.cs-content {}
.cs-section {
  margin-bottom: 72px;
}
.cs-section-label {
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 20px;
}
.cs-section-title {
  font-family: var(--f-display);
  font-size: clamp(1.4rem, 2.5vw, 1.9rem);
  font-weight: 600;
  letter-spacing: -.025em;
  line-height: 1.2;
  color: var(--ink);
  margin-bottom: 20px;
}
.cs-body-text {
  font-size: .95rem;
  color: var(--ink-2);
  line-height: 1.8;
  margin-bottom: 20px;
}
.cs-pull-quote {
  border-left: 3px solid var(--ink);
  padding: 16px 0 16px 24px;
  margin: 32px 0;
}
.cs-pull-quote p {
  font-family: var(--f-display);
  font-size: 1.2rem;
  font-weight: 500;
  letter-spacing: -.01em;
  color: var(--ink);
  line-height: 1.45;
  font-style: italic;
}

/* Images in case study */
.cs-img {
  margin: 36px 0;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--surface);
}
.cs-img img {
  width: 100%;
  display: block;
}
.cs-img-caption {
  padding: 12px 16px;
  font-size: .78rem;
  color: var(--ink-4);
  border-top: 1px solid var(--line);
  background: var(--surface);
}
.cs-img-grid {
  display: grid;
  gap: 12px;
  margin: 36px 0;
}
.cs-img-grid-2 { grid-template-columns: repeat(1, 1fr); }
.cs-img-grid-3 { grid-template-columns: repeat(1, 1fr); }
.cs-img-grid-4 { grid-template-columns: repeat(4, 1fr); }
.cs-img-grid-item {
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--surface);
}
.cs-img-grid-item img { width: 100%; display: block; }
.cs-img-grid-item-caption {
  padding: 10px 14px;
  font-size: .75rem;
  color: var(--ink-4);
  border-top: 1px solid var(--line);
  background: var(--surface);
}

/* Insight list */
.cs-insight-list {
  margin: 20px 0;
}
.cs-insight-item {
  display: flex;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.cs-insight-item:first-child { border-top: 1px solid var(--line); }
.cs-insight-num {
  font-family: var(--f-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--ink-4);
  min-width: 28px;
  padding-top: 2px;
}
.cs-insight-title {
  font-weight: 500;
  font-size: .92rem;
  color: var(--ink);
  margin-bottom: 4px;
}
.cs-insight-text {
  font-size: .875rem;
  color: var(--ink-3);
  line-height: 1.65;
}

/* Decision block */
.cs-decision {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 28px;
  margin: 20px 0;
}
.cs-decision-num {
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 8px;
}
.cs-decision-title {
  font-family: var(--f-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 10px;
}
.cs-decision-rationale {
  font-size: .875rem;
  font-weight: 500;
  color: var(--ink-3);
  margin-bottom: 8px;
}
.cs-decision-text {
  font-size: .875rem;
  color: var(--ink-3);
  line-height: 1.65;
}

/* Pros / Cons */
.cs-pros-cons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 20px 0;
}
.cs-pro, .cs-con {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px;
}
.cs-pro-title, .cs-con-title {
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.cs-pro-title { color: #2a7a4e; }
.cs-con-title { color: #d0412a; }
.cs-pro li, .cs-con li {
  font-size: .85rem;
  color: var(--ink-2);
  line-height: 1.6;
  padding: 4px 0;
  list-style: disc;
  margin-left: 16px;
}

/* Impact metrics */
.cs-impact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  margin: 36px 0;
  background: var(--line);
  border-radius: 12px;
  overflow: hidden;
}
.cs-impact-item {
  background: var(--surface);
  padding: 32px 24px;
  text-align: center;
}
.cs-impact-val {
  font-family: var(--f-display);
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -.04em;
  color: var(--ink);
  line-height: 1;
  margin-bottom: 8px;
}
.cs-impact-label {
  font-size: .75rem;
  color: var(--ink-4);
  text-transform: uppercase;
  letter-spacing: .08em;
  line-height: 1.4;
}

/* Next case study */
.cs-next {
  background: var(--surface);
  border-top: 1px solid var(--line);
  padding: 56px 32px;
  text-align: center;
}
.cs-next-label {
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 12px;
}
.cs-next-title {
  font-family: var(--f-display);
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: -.02em;
  color: var(--ink);
  margin-bottom: 20px;
}
.cs-next-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .9rem;
  font-weight: 500;
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
  transition: gap .2s;
}
.cs-next-link:hover { gap: 14px; }

/* ── About Page ──────────────────────────────────────────────── */
.about-hero {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 96px 32px 64px;
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 80px;
  align-items: start;
}
.about-headline {
  font-family: var(--f-display);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 600;
  letter-spacing: -.03em;
  line-height: 1.15;
  margin-bottom: 24px;
}
.about-bio {
  font-size: 1.0rem;
  color: var(--ink-2);
  line-height: 1.8;
  margin-bottom: 20px;
}
.about-contact-strip {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 32px;
}
.about-sidebar {}
.about-exp-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}
.about-exp-item {
  display: flex;
  gap: 16px;
  padding: 20px 24px;
  border-bottom: 1px solid var(--line);
}
.about-exp-item:last-child { border-bottom: none; }
.about-exp-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink-4);
  margin-top: 7px;
  flex-shrink: 0;
}
.about-exp-role {
  font-weight: 500;
  font-size: .9rem;
  color: var(--ink);
  margin-bottom: 2px;
}
.about-exp-company {
  font-size: .82rem;
  color: var(--ink-3);
}
.about-exp-year {
  font-size: .75rem;
  color: var(--ink-4);
  margin-top: 2px;
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 900px) {
  .hero { padding: 64px 24px 56px; }
  .work-section { padding: 0 24px 80px; }
  .case-grid { grid-template-columns: 1fr; }
  .why-header { grid-template-columns: 1fr; gap: 24px; }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .cs-sidebar-sticky { grid-template-columns: 1fr 1fr; }
  .cs-hero { padding: 48px 24px 0; }
  .cs-hero-img { padding: 0 24px; }
  .cs-meta-strip { gap: 24px; }
  .about-hero { grid-template-columns: 1fr; gap: 48px; }
  .footer { flex-direction: column; gap: 16px; text-align: center; }
  .cs-impact-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-inner { padding: 0 24px; }
}
@media (max-width: 640px) {
  .hero-headline { font-size: 2.2rem; }
  .case-body { padding: 20px; }
  .why-grid { grid-template-columns: 1fr; }
  .case-metrics { gap: 20px; }
  .cs-img-grid-2 { grid-template-columns: 1fr; }
  .cs-img-grid-3 { grid-template-columns: 1fr; }
  .cs-pros-cons { grid-template-columns: 1fr; }
  .cs-impact-grid { grid-template-columns: 1fr; }
  .pw-card { padding: 36px 24px; }
  .about-hero { padding: 64px 24px 40px; }
  .cs-sidebar-sticky { grid-template-columns: 1fr 1fr; }
  .cs-body { padding: 32px 24px 80px; }
}

/* ── Active nav state ────────────────────────────────────────── */
.nav-links a.nav-active {
  color: var(--ink);
  font-weight: 500;
}

/* ── Images: make clickable in case studies ──────────────────── */
.cs-img { cursor: zoom-in; }
.cs-img-grid-item { cursor: zoom-in; }
.cs-img:hover { box-shadow: 0 4px 24px rgba(20,20,18,.10); }
.cs-img-grid-item:hover { box-shadow: 0 4px 16px rgba(20,20,18,.10); }

/* ── Lightbox ────────────────────────────────────────────────── */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 500;
  background: rgba(10,10,8,.93);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s var(--ease);
  cursor: zoom-out;
}
.lightbox.open {
  opacity: 1;
  pointer-events: all;
}
.lightbox img {
  max-width: min(96vw, 1300px);
  max-height: 90vh;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: 0 24px 80px rgba(0,0,0,.5);
}
.lightbox-close {
  position: fixed;
  top: 20px;
  right: 24px;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 100px;
  color: #fff;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background .2s;
  font-size: 20px;
  line-height: 1;
}
.lightbox-close:hover { background: rgba(255,255,255,.22); }
.lightbox-caption {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  font-size: .8rem;
  color: rgba(255,255,255,.55);
  white-space: nowrap;
  pointer-events: none;
}