/* ---------- Design tokens ---------- */
:root {
  --bg: #F7F4EE;
  --bg-alt: #EFEBE2;
  --surface: #FFFFFF;
  --text: #17161A;
  --text-muted: #5B584F;
  --border: #E2DDD1;
  --accent: #4B3DE3;
  --accent-contrast: #FFFFFF;
  --accent-soft: #E8E5FB;

  --font-head: 'Space Grotesk', 'Helvetica Neue', Arial, sans-serif;
  --font-body: 'Inter', 'Helvetica Neue', Arial, sans-serif;

  --radius-s: 8px;
  --radius-m: 16px;
  --radius-l: 28px;

  --wrap: 1180px;
  --gutter: clamp(1.25rem, 4vw, 3rem);

  --ease: cubic-bezier(.16,.84,.44,1);
}

:root[data-theme="dark"] {
  --bg: #131217;
  --bg-alt: #1B1A21;
  --surface: #1E1D24;
  --text: #F3F1EA;
  --text-muted: #A6A3B0;
  --border: #302E38;
  --accent: #8B85FF;
  --accent-contrast: #131217;
  --accent-soft: #26224A;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #131217;
    --bg-alt: #1B1A21;
    --surface: #1E1D24;
    --text: #F3F1EA;
    --text-muted: #A6A3B0;
    --border: #302E38;
    --accent: #8B85FF;
    --accent-contrast: #131217;
    --accent-soft: #26224A;
  }
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background .3s var(--ease), color .3s var(--ease);
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3 { font-family: var(--font-head); font-weight: 600; line-height: 1.12; margin: 0 0 .5em; letter-spacing: -0.01em; }
p { margin: 0 0 1em; color: var(--text-muted); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 1rem; top: -50px;
  background: var(--accent); color: var(--accent-contrast);
  padding: .6rem 1rem; border-radius: var(--radius-s); z-index: 200;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 1rem; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }

.eyebrow {
  font-family: var(--font-body);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .9rem;
}

section { padding: clamp(3.5rem, 8vw, 7rem) 0; }

.section-head { max-width: 640px; margin-bottom: clamp(2rem, 5vw, 3.5rem); }
.section-head h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .85rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: .95rem;
  border: 1px solid transparent;
  transition: transform .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease);
}
.btn--primary { background: var(--accent); color: var(--accent-contrast); }
.btn--primary:hover { transform: translateY(-2px); }
.btn--ghost { border-color: var(--border); color: var(--text); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 1.1rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__mark { font-family: var(--font-head); font-weight: 600; font-size: 1.05rem; }
.nav__links {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2vw, 1.9rem);
}
.nav__links a:not(.nav__resume) {
  font-size: .92rem;
  color: var(--text-muted);
  transition: color .2s var(--ease);
}
.nav__links a:not(.nav__resume):hover { color: var(--text); }
.nav__resume {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: .5rem 1.1rem;
  font-size: .88rem;
  font-weight: 600;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}
.nav__resume:hover { border-color: var(--accent); color: var(--accent); }

.theme-toggle {
  background: none; border: 1px solid var(--border); border-radius: 999px;
  width: 38px; height: 38px; display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--text);
}
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

.nav__toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  width: 44px;
  height: 44px;
  padding: 0;
}
.nav__toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; }

/* ---------- Hero ---------- */
.hero { padding-top: clamp(3rem, 8vw, 6rem); }
.hero__grid {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.hero__headline {
  font-size: clamp(2.1rem, 4.6vw, 3.6rem);
  margin-bottom: .6em;
}
.hero__lead { font-size: 1.05rem; max-width: 46ch; }
.hero__ctas { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 1.6rem; }
.hero__media img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-l);
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid var(--border);
}

/* ---------- Work grid ---------- */
.work__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  overflow: hidden;
  transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}
.card:hover { transform: translateY(-6px); box-shadow: 0 20px 40px -24px rgba(0,0,0,.25); }
.card__media { display: block; overflow: hidden; aspect-ratio: 4/3; background: var(--bg-alt); }
.card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s var(--ease); }
.card:hover .card__media img { transform: scale(1.06); }
.card__body { padding: 1.4rem 1.5rem 1.6rem; }
.card__meta {
  display: flex; justify-content: space-between; gap: .5rem;
  font-size: .74rem; text-transform: uppercase; letter-spacing: .05em;
  color: var(--text-muted); margin-bottom: .75rem;
}
.card__meta span:first-child { color: var(--text); font-weight: 600; }
.card h3 { font-size: 1.1rem; margin-bottom: .5rem; }
.card p { font-size: .93rem; margin-bottom: 0; }

/* ---------- Workflow ---------- */
.workflow { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.workflow__grid {
  display: grid;
  grid-template-columns: 1.3fr .7fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}
.workflow h2 { font-size: clamp(1.6rem, 3.2vw, 2.2rem); }
.workflow__lead { font-size: 1.02rem; max-width: 58ch; }
.workflow__chips {
  display: flex; flex-wrap: wrap; gap: .6rem;
  align-content: flex-start;
}
.workflow__chips li {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: .55rem 1rem;
  border-radius: 999px;
  font-size: .88rem;
  font-weight: 500;
}

/* ---------- Timeline ---------- */
.timeline { display: flex; flex-direction: column; gap: 2.25rem; }
.timeline__item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: clamp(1rem, 3vw, 2.5rem);
  padding-bottom: 2.25rem;
  border-bottom: 1px solid var(--border);
}
.timeline__item:last-child { border-bottom: none; padding-bottom: 0; }
.timeline__when {
  font-size: .85rem; font-weight: 600; color: var(--text-muted);
  white-space: nowrap;
}
.timeline__body h3 { font-size: 1.15rem; margin-bottom: .5rem; }
.timeline__body p { max-width: 62ch; margin-bottom: 0; }

/* ---------- Toolkit ---------- */
.toolkit__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
  margin-bottom: clamp(2.5rem, 6vw, 4rem);
}
.toolkit__group h3 { font-size: 1rem; margin-bottom: 1rem; }
.tags { display: flex; flex-wrap: wrap; gap: .5rem; }
.tags li {
  font-size: .84rem;
  padding: .45rem .85rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.tags--accent li { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

.education { padding-top: clamp(2rem, 5vw, 3rem); border-top: 1px solid var(--border); }
.education h3 { font-size: 1rem; margin-bottom: 1.2rem; }
.education__list { display: flex; flex-direction: column; gap: .9rem; }
.education__list li {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: .3rem 1rem;
  font-size: .95rem;
  padding-bottom: .9rem;
  border-bottom: 1px solid var(--border);
}
.education__list li:last-child { border-bottom: none; padding-bottom: 0; }
.education__list li span:first-child { font-weight: 600; color: var(--text); }
.education__list li span:last-child { color: var(--text-muted); }

/* ---------- Contact ---------- */
.contact__grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.contact h2 { font-size: clamp(1.8rem, 3.6vw, 2.6rem); }
.contact__lead { font-size: 1.02rem; max-width: 46ch; }
.contact__links { display: flex; flex-direction: column; gap: 1rem; }
.contact__link {
  display: flex; justify-content: space-between; align-items: center;
  padding: 1.1rem 1.4rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  font-weight: 500;
  transition: border-color .2s var(--ease), transform .2s var(--ease), background .2s var(--ease);
}
.contact__link:hover { border-color: var(--accent); transform: translateX(4px); background: var(--accent-soft); }
.contact__label { font-size: .78rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); padding: 2rem 0; }
.site-footer__grid {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem;
  font-size: .85rem; color: var(--text-muted);
}

/* ---------- Reveal animation ----------
   Visible by default (progressive enhancement): only hides content
   once JS confirms it's running and can actually reveal it again. */
.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
  transition-delay: var(--delay, 0ms);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .card, .card__media img, .btn, .contact__link { transition: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__media { order: -1; max-width: 320px; margin: 0 auto; }
  .work__grid { grid-template-columns: repeat(2, 1fr); }
  .workflow__grid { grid-template-columns: 1fr; }
  .toolkit__grid { grid-template-columns: 1fr 1fr; }
  .contact__grid { grid-template-columns: 1fr; }
  .timeline__item { grid-template-columns: 1fr; gap: .5rem; }
}

/* ---------- Case study pages ---------- */
.case-back {
  display: inline-flex; align-items: center; gap: .4rem;
  font-size: .9rem; font-weight: 600; color: var(--text-muted);
  margin-bottom: 2rem; transition: color .2s var(--ease);
}
.case-back:hover { color: var(--accent); }

.case-hero { padding-top: clamp(2.5rem, 6vw, 4.5rem); padding-bottom: 0; }
.case-head { max-width: 780px; }
.case-head .eyebrow { margin-bottom: .75rem; }
.case-head h1 { font-size: clamp(2rem, 4.2vw, 3.1rem); margin-bottom: 1.5rem; }

.case-meta {
  display: flex; flex-wrap: wrap; gap: clamp(1.5rem, 4vw, 3rem);
  padding: 1.5rem 0 2.5rem;
  border-top: 1px solid var(--border);
}
.case-meta__item { display: flex; flex-direction: column; gap: .3rem; }
.case-meta__label {
  font-size: .74rem; text-transform: uppercase; letter-spacing: .06em;
  color: var(--text-muted);
}
.case-meta__value { font-weight: 600; font-size: .95rem; }

.case-media { padding-top: 0; padding-bottom: clamp(2rem, 5vw, 3.5rem); }
.case-media__img {
  width: 100%; border-radius: var(--radius-l); border: 1px solid var(--border);
  display: block;
}

.case-body { padding-top: 0; }
.case-copy { max-width: 700px; margin: 0 auto; }
.case-copy h2 { font-size: clamp(1.3rem, 2.4vw, 1.6rem); margin-top: 2.5rem; }
.case-copy h2:first-child { margin-top: 0; }
.case-copy p { font-size: 1.02rem; }

.case-gallery {
  margin-top: 1.5rem;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem;
}
@media (min-width: 721px) {
  .case-gallery--quad { grid-template-columns: repeat(4, 1fr); }
}
.case-gallery figure { margin: 0; }
.case-gallery img {
  width: 100%; display: block; border-radius: var(--radius-l);
  border: 1px solid var(--border);
}
.case-gallery figcaption {
  margin-top: .6rem; font-size: .82rem; color: var(--text-muted);
  text-align: center;
}
@media (max-width: 720px) {
  .case-gallery { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .case-gallery { grid-template-columns: 1fr; max-width: 320px; margin-left: auto; margin-right: auto; }
}

.case-feature { margin-top: 3rem; }
.case-feature + .case-feature { margin-top: 3.5rem; }
.case-feature h3 {
  font-family: var(--font-head); font-weight: 600;
  font-size: 1.25rem; margin-bottom: 1.1rem; letter-spacing: -0.01em;
}
.case-feature img {
  width: 100%; display: block; border-radius: var(--radius-l);
  border: 1px solid var(--border); margin-bottom: 1.25rem;
}
.case-feature p { font-size: 1.02rem; margin-bottom: 0; }

.case-figure { margin: 2rem 0 0; }
.case-figure img {
  width: 100%; display: block; border-radius: var(--radius-l);
  border: 1px solid var(--border);
}
.case-figure figcaption {
  margin-top: .6rem; font-size: .82rem; color: var(--text-muted);
  text-align: center;
}

.case-approach-closing { margin-top: 2.5rem; }

.case-proto {
  display: flex; flex-wrap: wrap; gap: 1rem;
  margin-top: .5rem; margin-bottom: clamp(2rem, 5vw, 3.5rem);
}
.case-proto .btn { padding: .95rem 1.8rem; font-size: 1rem; box-shadow: 0 8px 20px -8px color-mix(in srgb, var(--accent) 60%, transparent); }

.case-note {
  margin-top: 2.5rem; padding: 1.25rem 1.5rem;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  font-size: .92rem; color: var(--text-muted);
}
.case-note p { margin-bottom: 0; color: var(--text-muted); }

.case-next { border-top: 1px solid var(--border); }
.case-next__inner {
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 1rem;
}
.case-next__eyebrow {
  font-size: .78rem; text-transform: uppercase; letter-spacing: .06em;
  color: var(--text-muted); margin-bottom: .4rem;
}
.case-next__link {
  display: flex; align-items: center; gap: 1rem;
  transition: gap .2s var(--ease), color .2s var(--ease);
}
.case-next__link > span:first-child { display: flex; flex-direction: column; gap: .4rem; }
.case-next__link strong {
  font-family: var(--font-head); font-size: clamp(1.3rem, 2.6vw, 1.8rem);
  font-weight: 600; color: var(--text);
}
.case-next__link:hover strong { color: var(--accent); }
.case-next__link:hover { gap: 1rem; color: var(--accent); }

@media (max-width: 680px) {
  .case-meta { gap: 1.25rem 2rem; }
  .case-next__inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 680px) {
  .nav__links {
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    padding: .5rem var(--gutter) 1.75rem;
    gap: .25rem;
    display: none;
  }
  .nav__links.is-open { display: flex; }
  .nav__links a:not(.nav__resume) {
    display: flex;
    align-items: center;
    min-height: 44px;
  }
  .nav__toggle { display: flex; }
  .work__grid { grid-template-columns: 1fr; }
  .toolkit__grid { grid-template-columns: 1fr; }
}