/* Header and navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: var(--surface-page);
  border-bottom: var(--border-width) solid var(--border-on-light);
}

.site-header .shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1.25rem;
  transition: padding-block var(--duration-fast) var(--ease-standard);
}

.site-header.is-compact .shell {
  padding-block: .8rem;
}

.site-logo {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1.3rem;
  letter-spacing: -0.01em;
}

.site-logo .amp { color: var(--green-700); }

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 2vw, 2.5rem);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(1.1rem, 1.8vw, 1.75rem);
  font-size: .98rem;
}

.site-nav__list a {
  position: relative;
  padding-block: .3rem;
}

.site-nav__list a[aria-current="page"] {
  color: var(--green-700);
}

.site-nav__list a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--green-700);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-fast) var(--ease-standard);
}

.site-nav__list a:hover::after,
.site-nav__list a:focus-visible::after {
  transform: scaleX(1);
}

.services-disclosure {
  position: relative;
}

.services-disclosure__trigger {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
}

.services-disclosure__panel {
  position: absolute;
  top: calc(100% + .6rem);
  left: 0;
  background: var(--surface-raised);
  border: var(--border-width) solid var(--border-on-light);
  border-radius: var(--radius-md);
  padding: .6rem;
  min-width: 260px;
  box-shadow: 0 12px 32px rgba(10, 10, 11, .12);
  display: none;
  flex-direction: column;
}

.services-disclosure[data-open="true"] .services-disclosure__panel {
  display: flex;
}

.services-disclosure__panel a {
  padding: .55rem .75rem;
  border-radius: var(--radius-sm);
  font-size: .95rem;
}

.services-disclosure__panel a:hover,
.services-disclosure__panel a:focus-visible {
  background: var(--paper-100);
}

.services-disclosure__panel .services-disclosure__all {
  margin-top: .3rem;
  border-top: var(--border-width) solid var(--border-on-light);
  padding-top: .6rem;
  font-weight: 600;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: .5rem;
  border-radius: var(--radius-sm);
}

.nav-toggle__bar {
  width: 22px;
  height: 2px;
  background: currentColor;
}

@media (max-width: 860px) {
  .site-nav__list, .services-disclosure, .site-nav__cta { display: none; }
  .nav-toggle { display: flex; }
}

/* Mobile nav overlay */
.mobile-nav-panel {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  background: var(--surface-dark);
  color: var(--text-on-dark);
  display: flex;
  flex-direction: column;
  padding: 1.25rem var(--gutter) 2rem;
  transform: translateX(100%);
  transition: transform var(--duration-base) var(--ease-out);
}

.mobile-nav-panel[data-open="true"] {
  transform: translateX(0);
}

.mobile-nav-panel__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: .75rem;
}

.mobile-nav-panel__close {
  font-size: 1.6rem;
  line-height: 1;
  padding: .4rem .6rem;
}

.mobile-nav-panel nav {
  margin-top: 2rem;
}

.mobile-nav-panel__list {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  font-size: clamp(1.5rem, 6vw, 2rem);
}

.mobile-nav-panel__list a {
  display: block;
  padding: .5rem 0;
}

.mobile-nav-panel__services {
  margin-top: 1.75rem;
  padding-top: 1.75rem;
  border-top: var(--border-width) solid var(--border-on-dark);
  display: flex;
  flex-direction: column;
  gap: .5rem;
}

.mobile-nav-panel__services a { font-size: 1.05rem; color: var(--text-on-dark-muted); }

.mobile-nav-panel__contact {
  margin-top: auto;
  padding-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .95rem;
}

.mobile-nav-panel__cta { margin-top: 1.25rem; }

@media (prefers-reduced-motion: reduce) {
  .mobile-nav-panel { transition: none; }
}

/* Buttons and links */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .65rem 1.1rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: .95rem;
  min-height: 44px;
  transition: background var(--duration-fast) var(--ease-standard), color var(--duration-fast) var(--ease-standard);
}

.btn-primary {
  background: var(--ink-950);
  color: var(--paper-50);
}

.btn-primary:hover, .btn-primary:focus-visible { background: var(--green-700); color: var(--white); }

.surface-dark .btn-primary {
  background: var(--green-500);
  color: var(--ink-950);
}

.surface-dark .btn-primary:hover, .surface-dark .btn-primary:focus-visible {
  background: var(--paper-50);
}

.btn-secondary {
  border: var(--border-width) solid var(--border-on-light);
}

.btn-secondary:hover, .btn-secondary:focus-visible {
  border-color: var(--ink-950);
}

.surface-dark .btn-secondary {
  border-color: var(--border-on-dark);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-weight: 600;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}

.link-arrow:hover, .link-arrow:focus-visible {
  color: var(--green-700);
}

.surface-dark .link-arrow:hover, .surface-dark .link-arrow:focus-visible {
  color: var(--green-500);
}

/* Breadcrumbs */
.breadcrumb-trail {
  display: flex;
  align-items: center;
  gap: .4rem;
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--text-on-light-muted);
  padding-top: clamp(1.25rem, 3vw, 2rem);
}

.breadcrumb-trail a:hover { color: var(--ink-950); }
.breadcrumb-trail .sep { color: var(--border-on-light); }

/* Archive frame */
.archive-frame {
  border: var(--border-width) solid var(--border-on-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--white);
}

.archive-frame__chrome {
  display: flex;
  align-items: center;
  gap: .4rem;
  padding: .6rem .85rem;
  background: var(--paper-100);
  border-bottom: var(--border-width) solid var(--border-on-light);
}

.archive-frame__dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--line-light);
}

.archive-frame__label {
  margin-left: .5rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--text-on-light-muted);
}

.archive-frame__media {
  max-height: 70vh;
  overflow-y: auto;
  scrollbar-gutter: stable;
}

.archive-frame figcaption {
  font-size: .88rem;
  color: var(--text-on-light-muted);
  padding: .9rem 1rem;
  border-top: var(--border-width) solid var(--border-on-light);
}

/* Project rail */
.project-rail {
  display: flex;
  gap: 1.25rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: .75rem;
  scrollbar-width: thin;
}

.project-rail__item {
  scroll-snap-align: start;
  flex: 0 0 clamp(240px, 32vw, 360px);
}

.project-rail__controls {
  display: flex;
  gap: .6rem;
  margin-top: 1rem;
}

.project-rail__btn {
  width: 44px; height: 44px;
  border-radius: 50%;
  border: var(--border-width) solid var(--border-on-light);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.project-rail__btn:disabled {
  opacity: .35;
  cursor: not-allowed;
}

.surface-dark .project-rail__btn { border-color: var(--border-on-dark); }

/* Work rows / chapters */
.work-chapter {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.work-chapter:nth-of-type(even) {
  direction: rtl;
}

.work-chapter:nth-of-type(even) > * {
  direction: ltr;
}

@media (max-width: 900px) {
  .work-chapter, .work-chapter:nth-of-type(even) {
    grid-template-columns: 1fr;
    direction: ltr;
  }
}

.work-chapter__tags {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--text-on-light-muted);
  margin-top: 1rem;
}

.work-chapter__tags span {
  border: var(--border-width) solid var(--border-on-light);
  border-radius: 999px;
  padding: .25rem .65rem;
}

/* Filters */
.work-filters {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

.work-filters button {
  border: var(--border-width) solid var(--border-on-light);
  border-radius: 999px;
  padding: .5rem 1rem;
  font-size: .88rem;
}

.work-filters button[aria-pressed="true"] {
  background: var(--ink-950);
  color: var(--paper-50);
  border-color: var(--ink-950);
}

/* Diagrams */
.diagram {
  border: var(--border-width) solid var(--border-on-light);
  border-radius: var(--radius-md);
  padding: clamp(1.25rem, 3vw, 2rem);
  background: var(--white);
}

.diagram svg text {
  font-family: var(--font-mono);
}

.diagram figcaption {
  margin-top: 1rem;
  font-size: .9rem;
  color: var(--text-on-light-muted);
}

/* Facts row */
.facts-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  border-top: var(--border-width) solid var(--border-on-light);
  border-bottom: var(--border-width) solid var(--border-on-light);
  padding-block: 1.5rem;
}

.facts-row dt {
  font-family: var(--font-mono);
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: var(--tracking-label);
  color: var(--text-on-light-muted);
  margin-bottom: .4rem;
}

.facts-row dd { margin: 0; font-weight: 600; }

@media (max-width: 760px) {
  .facts-row { grid-template-columns: repeat(2, 1fr); }
}

/* Chapter rail (case study sticky nav) */
.chapter-rail {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  font-size: .92rem;
}

.chapter-rail a {
  padding: .4rem .1rem;
  color: var(--text-on-light-muted);
  border-left: 2px solid transparent;
  padding-left: .85rem;
}

.chapter-rail a[aria-current="true"] {
  color: var(--ink-950);
  border-left-color: var(--green-700);
  font-weight: 600;
}

/* Case nav (prev/next) */
.case-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.case-nav a {
  display: block;
  padding: 1.5rem;
  border: var(--border-width) solid var(--border-on-light);
  border-radius: var(--radius-md);
}

.case-nav a:hover, .case-nav a:focus-visible {
  border-color: var(--ink-950);
}

.case-nav__label {
  font-family: var(--font-mono);
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: var(--tracking-label);
  color: var(--text-on-light-muted);
  display: block;
  margin-bottom: .5rem;
}

@media (max-width: 700px) {
  .case-nav { grid-template-columns: 1fr; }
}

/* Credits / disclosure banner */
.credits-boundaries {
  border-top: var(--border-width) solid var(--border-on-light);
  padding-top: 1.5rem;
  font-size: .96rem;
}

/* Form controls */
.form-field {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  margin-bottom: 1.4rem;
}

.form-field label {
  font-weight: 600;
  font-size: .92rem;
}

.form-field .hint {
  font-size: .82rem;
  color: var(--text-on-light-muted);
}

.form-field input,
.form-field select,
.form-field textarea {
  border: var(--border-width) solid var(--border-on-light);
  border-radius: var(--radius-sm);
  padding: .75rem .9rem;
  background: var(--white);
  min-height: 44px;
}

.form-field textarea { min-height: 120px; resize: vertical; }

.form-field input:focus-visible,
.form-field select:focus-visible,
.form-field textarea:focus-visible {
  border-color: var(--cobalt-500);
}

.form-field[data-invalid="true"] input,
.form-field[data-invalid="true"] select,
.form-field[data-invalid="true"] textarea {
  border-color: var(--coral-500);
}

.form-field__error {
  font-size: .82rem;
  color: var(--coral-500);
  display: none;
}

.form-field[data-invalid="true"] .form-field__error { display: block; }

.checkbox-field {
  display: flex;
  gap: .6rem;
  align-items: flex-start;
}

.checkbox-field input { margin-top: .2rem; width: 20px; height: 20px; }

.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

.checkbox-group label {
  display: flex;
  align-items: center;
  gap: .5rem;
  border: var(--border-width) solid var(--border-on-light);
  border-radius: 999px;
  padding: .5rem .9rem;
  font-size: .88rem;
  font-weight: 500;
}

.error-summary {
  border: var(--border-width) solid var(--coral-500);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  display: none;
}

.error-summary[data-visible="true"] { display: block; }

.error-summary h2 { font-size: 1.05rem; margin-bottom: .5rem; }
.error-summary ul { list-style: disc; padding-left: 1.2rem; }
.error-summary li { margin-bottom: .25rem; }

.form-status {
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-top: 1.25rem;
  border: var(--border-width) solid var(--border-on-light);
  display: none;
}

.form-status[data-visible="true"] { display: block; }
.form-status[data-tone="success"] { border-color: var(--green-700); }
.form-status[data-tone="error"] { border-color: var(--coral-500); }

/* FAQ disclosure */
.faq-item { border-bottom: var(--border-width) solid var(--border-on-light); }

.faq-item summary {
  padding: 1.1rem 0;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.faq-item summary::after {
  content: "+";
  font-family: var(--font-mono);
}

.faq-item[open] summary::after { content: "\2212"; }

.faq-item .faq-answer { padding-bottom: 1.1rem; color: var(--text-on-light-muted); }

/* Article */
.article-body h2 { font-size: var(--size-h3); margin-top: 2.5rem; margin-bottom: 1rem; }
.article-body h3 { font-size: 1.3rem; margin-top: 2rem; margin-bottom: .75rem; }
.article-body p, .article-body li { font-size: var(--size-body); line-height: var(--leading-relaxed); }
.article-body p { margin-bottom: 1.25rem; }
.article-body ul, .article-body ol { margin-bottom: 1.25rem; padding-left: 1.4rem; }
.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }
.article-body li { margin-bottom: .5rem; }

.article-meta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--text-on-light-muted);
  margin-top: 1rem;
}

/* Footer */
.site-footer {
  padding-block: clamp(4rem, 9vw, 7rem) 2.5rem;
}

.site-footer__lead {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-style: italic;
  max-width: 24ch;
}

.site-footer__body {
  margin-top: 1.25rem;
  max-width: 46ch;
  color: var(--text-on-dark-muted);
}

.site-footer__contact {
  margin-top: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: .6rem;
  font-family: var(--font-mono);
}

.site-footer__nav-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: clamp(3rem, 6vw, 5rem);
  padding-top: 2.5rem;
  border-top: var(--border-width) solid var(--border-on-dark);
}

.site-footer__nav-grid h2 {
  font-family: var(--font-mono);
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: var(--tracking-label);
  color: var(--text-on-dark-muted);
  margin-bottom: 1rem;
  font-weight: 500;
}

.site-footer__nav-grid ul { display: flex; flex-direction: column; gap: .6rem; }

.site-footer__bottom {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: var(--border-width) solid var(--border-on-dark);
  font-size: .82rem;
  color: var(--text-on-dark-muted);
}

@media (max-width: 760px) {
  .site-footer__nav-grid { grid-template-columns: 1fr 1fr; }
}

/* Error / 404 */
.error-panel {
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1.5rem;
}

.error-panel__links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

/* Selected-websites archive grid */
.archive-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

@media (max-width: 900px) {
  .archive-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 620px) {
  .archive-grid { grid-template-columns: 1fr; }
}

.archive-grid figure {
  margin: 0;
  border: var(--border-width) solid var(--border-on-light);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.archive-grid picture,
.archive-grid img {
  display: block;
  width: 100%;
}

.archive-grid img {
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: top;
}

.archive-card__chrome {
  display: flex;
  align-items: center;
  gap: .35rem;
  min-height: 2.25rem;
  padding-inline: .75rem;
  border-bottom: var(--border-width) solid var(--border-on-light);
  background: var(--paper-100);
}

.archive-card__chrome span {
  width: .45rem;
  height: .45rem;
  border-radius: 50%;
  background: var(--line-light);
}

.archive-card__chrome small {
  margin-left: .35rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--text-on-light-muted);
}

.archive-grid figcaption { padding: 1rem; }

.archive-grid .work-chapter__tags { margin-top: .6rem; }