/* Shared tokens — match index.html */
:root {
  --bg: #ffffff;
  --text: #0a0a0a;
  --muted: #737373;
  --border: #e5e5e5;
  --surface: #f5f5f5;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --font: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --max: 1120px;
  --max-narrow: 42rem;
  --pad-x: clamp(1.25rem, 4vw, 2.5rem);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

.wrap {
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.wrap--narrow {
  max-width: var(--max-narrow);
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}

.header.is-scrolled {
  border-color: var(--border);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  padding-block: 1rem;
  min-width: 0;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  min-width: 0;
  flex-shrink: 1;
}

.logo__photo {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.logo__name--short {
  display: none;
}

.nav-toggle {
  display: none;
  flex-shrink: 0;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1px;
  margin-inline: auto;
  background: var(--text);
  transition: transform 0.25s ease;
}

.nav-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(3.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 3vw, 1.5rem);
}

.nav a {
  font-size: 0.875rem;
  color: var(--muted);
  transition: color 0.2s ease;
  white-space: nowrap;
}

.nav a:hover {
  color: var(--text);
}

body.nav-open {
  overflow: hidden;
}

.nav-backdrop {
  display: none;
}

@media (max-width: 768px) {
  .logo__name--full {
    display: none;
  }

  .logo__name--short {
    display: inline;
  }

  .nav-toggle {
    display: flex;
    position: relative;
    z-index: 52;
  }

  .nav-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 48;
    background: color-mix(in srgb, var(--text) 32%, transparent);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s var(--ease), visibility 0.3s var(--ease);
    pointer-events: none;
  }

  .nav-backdrop.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav {
    position: fixed;
    z-index: 49;
    top: 0;
    right: 0;
    bottom: 0;
    left: auto;
    width: min(17.5rem, 88vw);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding:
      calc(4.5rem + env(safe-area-inset-top, 0px))
      var(--pad-x)
      calc(1.5rem + env(safe-area-inset-bottom, 0px));
    background: var(--bg);
    border-left: 1px solid var(--border);
    box-shadow: -12px 0 40px color-mix(in srgb, var(--text) 8%, transparent);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    transform: translateX(100%);
    transition: transform 0.3s var(--ease), visibility 0.3s var(--ease);
    visibility: hidden;
    pointer-events: none;
  }

  .nav.is-open {
    transform: translateX(0);
    visibility: visible;
    pointer-events: auto;
  }

  .nav a {
    width: 100%;
    padding-block: 0.875rem;
    font-size: 1.125rem;
    color: var(--text);
    border-bottom: 1px solid var(--border);
    white-space: normal;
  }

  .nav a:last-child {
    border-bottom: none;
  }
}

/* Case hero */
.case-hero {
  padding-block: clamp(2rem, 6vw, 3.5rem) clamp(2.5rem, 5vw, 4rem);
  border-bottom: 1px solid var(--border);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: 2rem;
  transition: gap 0.3s var(--ease), color 0.2s ease;
}

.back-link:hover {
  color: var(--text);
  gap: 0.55rem;
}

.case-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  font-size: 0.8125rem;
  color: var(--muted);
  margin-bottom: 1.25rem;
}

.case-hero__meta span:not(:last-child)::after {
  content: "·";
  margin-left: 1.25rem;
  color: var(--border);
}

.case-hero__title {
  font-size: clamp(2rem, 6vw, 3.25rem);
  font-weight: 400;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 1.25rem;
  max-width: 20ch;
}

.case-hero__lead {
  font-size: clamp(1.0625rem, 2.2vw, 1.25rem);
  line-height: 1.65;
  color: var(--muted);
  max-width: 40em;
  margin-bottom: 2rem;
}

.case-hero__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.fact__label {
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.fact__value {
  font-size: 0.9375rem;
}

/* Cover */
.case-cover {
  padding-block: clamp(1.5rem, 4vw, 2.5rem);
}

.case-cover__img {
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--surface);
  border-radius: 4px;
}

/* Content sections */
.case-body {
  padding-block: clamp(2.5rem, 6vw, 4rem);
}

.case-section {
  padding-block: clamp(2rem, 5vw, 3rem);
  border-top: 1px solid var(--border);
}

.case-section:first-child {
  border-top: none;
  padding-top: 0;
}

.case-section__label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}

.case-section__title {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1.25;
  margin-bottom: 1rem;
  max-width: 28ch;
}

.case-section p,
.case-section li {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--muted);
  max-width: 40em;
}

.case-section p a {
  color: var(--text);
  font-weight: 500;
  border-bottom: 1px solid var(--border);
  transition: opacity 0.2s ease;
}

.case-section p a:hover {
  opacity: 0.55;
}

.case-section code {
  font-size: 0.875em;
  padding: 0.15em 0.4em;
  background: var(--surface);
  border-radius: 3px;
}

.case-section p + p {
  margin-top: 1rem;
}

.case-list {
  list-style: none;
  margin-top: 1.125rem;
  margin-bottom: 0.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.case-list li {
  padding-left: 1.35rem;
  position: relative;
  line-height: 1.55;
}

.case-list li::before {
  content: "–";
  position: absolute;
  left: 0;
  color: var(--muted);
}

/* Gallery */
.gallery {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.gallery--full {
  grid-template-columns: 1fr;
}

.gallery--pair {
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .gallery--pair {
    grid-template-columns: repeat(2, 1fr);
  }
}

.gallery__item {
  overflow: hidden;
  border-radius: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
}

.gallery__item img {
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transition: transform 0.6s var(--ease);
}

.gallery__item:hover img {
  transform: scale(1.02);
}

.gallery__caption {
  padding: 0.75rem 1rem;
  font-size: 0.8125rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

/* Steps */
.steps {
  list-style: none;
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.step {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.step:last-child {
  border-bottom: none;
}

.step__num {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.step__title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.35rem;
}

.step__text {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--muted);
}

/* Outro */
.case-outro {
  padding-block: clamp(2.5rem, 6vw, 4rem);
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.case-outro__text {
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  letter-spacing: -0.02em;
  max-width: 24ch;
}

.outro-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
}

.outro-link {
  font-size: 0.9375rem;
  font-weight: 500;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
  transition: opacity 0.2s ease;
}

.outro-link:hover {
  opacity: 0.5;
}

/* Footer */
.footer {
  padding-block: 1.5rem 2rem;
  border-top: 1px solid var(--border);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.8125rem;
  color: var(--muted);
}

.footer a:hover {
  color: var(--text);
}

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .gallery__item:hover img {
    transform: none;
  }

  .nav {
    transition: none;
  }
}