/* ===================================================================
   SITE STYLES — layout, components, typography rhythm
   =================================================================== */

.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-5), 4vw, var(--space-12));
}

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

.container--default {
  max-width: var(--content-default);
}

/* ---------------------------- HEADER ---------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow var(--transition-interactive);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding-block: var(--space-4);
}

.wordmark {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  font-family: var(--font-display), serif;
  font-weight: 400;
  font-size: var(--text-lg);
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.wordmark small {
  font-family: var(--font-body), sans-serif;
  font-weight: 400;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.wordmark__mark {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
  object-fit: contain;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.main-nav ul {
  display: flex;
  gap: var(--space-6);
  list-style: none;
}

.footer-links ul, .credential-list, .sources-list {
  list-style: none;
}

.main-nav a {
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  padding-block: var(--space-2);
  border-bottom: 1px solid transparent;
}

.main-nav a:hover,
.main-nav a[aria-current='page'] {
  color: var(--color-text);
  border-bottom-color: var(--color-primary);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.theme-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

.nav-toggle {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
}

/* ---------------------------- BUTTONS ---------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 400;
  padding: var(--space-3) var(--space-6);
  border-radius: 0;
  border: 1px solid var(--color-text);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-text);
  border-color: var(--color-text);
  color: var(--color-text-inverse);
}
.btn--primary:hover { background: var(--color-bg); color: var(--color-text); }

.btn--ghost {
  border-color: var(--color-border);
  color: var(--color-text);
  background: transparent;
}
.btn--ghost:hover { border-color: var(--color-text); }

.btn--sm { padding: var(--space-2) var(--space-4); font-size: var(--text-xs); }

/* ---------------------------- CATEGORY CHIPS ---------------------------- */

/* Eyebrow-style category labels — plain tracked uppercase text, no pill/background,
   matching the style-guide reference's "PHYSICAL / ADVANCED / DIGITAL" tag treatment. */
.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 0;
  background: transparent;
  border-radius: 0;
}

.chip--architecture { color: var(--color-architecture); }
.chip--compliance { color: var(--color-compliance); }
.chip--ethics { color: var(--color-ethics); }
.chip--labor { color: var(--color-labor); }

.chip + .chip::before {
  content: '·';
  margin-inline: var(--space-2);
  color: var(--color-text-faint);
  font-weight: 400;
  letter-spacing: 0;
}

/* Flex container required so ::before pseudo-element renders inline between chips */
.card .chip-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0;
}

/* ---------------------------- HERO ---------------------------- */

.hero {
  position: relative;
  padding-block: clamp(var(--space-16), 10vw, var(--space-32)) clamp(var(--space-12), 6vw, var(--space-20));
  overflow: hidden;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: var(--space-12);
  align-items: end;
}

.hero__eyebrow {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero__eyebrow::before {
  content: '';
  width: var(--space-8);
  height: 1px;
  background: var(--color-primary);
}

.hero h1 {
  font-size: var(--text-hero);
  font-weight: 400;
  letter-spacing: -0.015em;
  max-width: 16ch;
}

.hero h1 em {
  font-style: italic;
  color: var(--color-primary);
}

.hero__lede {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 46ch;
  margin-top: var(--space-6);
}

.hero__meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: flex-end;
  text-align: right;
}

.hero__meta p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 30ch;
  background: var(--color-bg);
  padding: var(--space-3) var(--space-4);
  box-shadow: 0 0 0 1px var(--color-divider);
}

[data-theme='dark'] .hero__meta p {
  background: var(--color-bg);
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}

.hero__bg img {
  position: absolute;
  top: 0;
  right: 0;
  height: 100%;
  width: 68%;
  min-width: 480px;
  object-fit: cover;
  object-position: center;
  opacity: 0.9;
  -webkit-mask-image: linear-gradient(to right, transparent 0%, rgba(0, 0, 0, 0.35) 22%, black 52%);
  mask-image: linear-gradient(to right, transparent 0%, rgba(0, 0, 0, 0.35) 22%, black 52%);
}

[data-theme='dark'] .hero__bg img {
  opacity: 0.16;
}

.blueprint {
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0.55;
  pointer-events: none;
}

[data-theme='dark'] .blueprint { opacity: 0.3; }

/* ---------------------------- SECTION HEADINGS ---------------------------- */

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-6);
  margin-bottom: var(--space-10);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-divider);
}

.section-head h2 {
  font-size: var(--text-xl);
  font-weight: 400;
}

.section-head .section-head__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

section { padding-block: clamp(var(--space-12), 6vw, var(--space-24)); }

/* ---------------------------- FEATURE CARD ---------------------------- */

.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-10);
  align-items: center;
  padding: var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl);
}

.feature__art {
  aspect-ratio: 4/3;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface-offset);
}

.feature__art img { width: 100%; height: 100%; object-fit: cover; }

.feature__body .chip { margin-bottom: var(--space-4); }

.feature__body h3 {
  font-size: var(--text-2xl);
  font-weight: 400;
  line-height: 1.08;
  margin-bottom: var(--space-4);
}

.feature__body p.dek {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  margin-bottom: var(--space-6);
  max-width: 48ch;
}

.feature__foot {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

/* ---------------------------- CARD GRID ---------------------------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.card__art {
  aspect-ratio: 16/10;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface-offset);
}

.card__art img { width: 100%; height: 100%; object-fit: cover; transition: transform 400ms cubic-bezier(0.16,1,0.3,1); }
.card:hover .card__art img { transform: scale(1.035); }

.card h3 {
  font-size: var(--text-lg);
  font-weight: 400;
  line-height: 1.25;
}

.card h3 a:hover { color: var(--color-primary); }

.card p.dek {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.card__meta .dot::before { content: '\2022'; margin-inline-end: var(--space-3); }

/* ---------------------------- FILTER TABS ---------------------------- */

.filters {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-10);
}

.filter-btn {
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: var(--space-2) var(--space-5);
  border-radius: 0;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.filter-btn:hover { border-color: var(--color-primary); color: var(--color-text); }

.filter-btn.is-active {
  background: var(--color-text);
  color: var(--color-text-inverse);
  border-color: var(--color-text);
}

/* ---------------------------- ARTICLE / ESSAY PAGE ---------------------------- */

.article-head {
  padding-block: clamp(var(--space-16), 8vw, var(--space-24)) var(--space-10);
  border-bottom: 1px solid var(--color-divider);
}

.article-head .chip { margin-bottom: var(--space-6); }

.article-head h1 {
  font-size: var(--text-3xl);
  font-weight: 400;
  line-height: 1.05;
  max-width: 22ch;
  margin-bottom: var(--space-6);
}

.article-head .dek {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-bottom: var(--space-8);
}

.byline {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.byline__avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  overflow: hidden;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display), serif;
  font-style: italic;
  font-size: var(--text-base);
}
.byline__avatar img { width: 100%; height: 100%; object-fit: cover; }

.byline strong { color: var(--color-text); font-weight: 600; }

.article-actions {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.article-body {
  max-width: var(--content-narrow);
  margin-inline: auto;
  padding-block: clamp(var(--space-12), 6vw, var(--space-20));
}

.article-body > * + * { margin-top: var(--space-6); }

.article-body h2 {
  font-size: var(--text-xl);
  font-weight: 400;
  margin-top: var(--space-12);
}

.article-body h3 {
  font-size: var(--text-lg);
  font-weight: 400;
  margin-top: var(--space-10);
}

.article-body p {
  font-size: var(--text-base);
  line-height: 1.75;
  color: var(--color-text);
  max-width: 68ch;
}

.article-body p.lede {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  font-family: var(--font-display), serif;
  font-style: italic;
}

.article-body a { color: var(--color-primary); text-underline-offset: 3px; text-decoration: underline; }
.article-body a:hover { color: var(--color-primary-hover); }

.article-body blockquote {
  border-left: 3px solid var(--color-primary);
  padding-left: var(--space-6);
  font-family: var(--font-display), serif;
  font-size: var(--text-lg);
  font-style: italic;
  color: var(--color-text);
  max-width: 60ch;
}

.article-body ul, .article-body ol {
  padding-left: var(--space-6);
  max-width: 66ch;
}
.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }
.article-body li { margin-top: var(--space-2); }

.article-body table {
  font-size: var(--text-sm);
  margin-top: var(--space-8);
  /* display:block required for overflow-x:auto to work on tables */
  display: block;
  overflow-x: auto;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
}
.article-body th, .article-body td {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-divider);
  vertical-align: top;
}
.article-body th { font-weight: 600; color: var(--color-text-muted); text-transform: uppercase; font-size: var(--text-xs); letter-spacing: 0.04em; }

/* First-column-as-label tables (qualitative reference tables) */
.article-body table tr td:first-child,
.article-body table tr th:first-child {
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
}

/* background must target td, not tr, to be visible in block-display tables */
.article-body table tbody tr:nth-child(even) td {
  background: var(--color-surface-offset);
}

.article-body table tbody tr:hover td {
  background: var(--color-primary-highlight);
  transition: background var(--transition-interactive);
}

/* Chart wrappers */
.chart-wrapper {
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  padding: var(--space-6);
  max-width: 100%;
}

.chart-wrapper canvas {
  max-height: 420px;
}

/* Radar charts need square-ish aspect */
.chart-wrapper canvas[data-chart-type="radar"] {
  max-height: 480px;
}

/* Hide data tables that have a chart above them — keep for print/a11y */
/* Specificity 0,2,0 beats .article-body table (0,1,1) */
.article-body .chart-data-table {
  display: none;
  font-size: var(--text-xs);
  margin-top: var(--space-4);
  -webkit-overflow-scrolling: touch;
}

@media print {
  .chart-wrapper { display: none; }
  .chart-data-table {
    display: table !important;
    opacity: 1;
    overflow-x: visible;
  }
}

/* ── Visual card grids (qualitative tables) ── */

.visual-card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
}

.visual-card {
  padding: var(--space-5) var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-left: 3px solid var(--color-primary);
}

.visual-card__title {
  font-family: var(--font-display), serif;
  font-size: var(--text-base);
  font-weight: 400;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
  line-height: 1.3;
}

.visual-card__subtitle {
  font-size: var(--text-sm);
  color: var(--color-text);
  font-weight: 500;
  margin-bottom: var(--space-2);
  line-height: 1.5;
}

.visual-card__body {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.65;
}

@media (max-width: 640px) {
  .visual-card-grid { grid-template-columns: 1fr; }
}

.article-body hr {
  border: none;
  border-top: 1px solid var(--color-divider);
  margin-block: var(--space-10);
}

.sources-list {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.sources-list li { margin-top: var(--space-3); }

.pull-figure {
  margin-top: var(--space-10);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.pull-figure img { width: 100%; }
.pull-figure figcaption {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-3);
  max-width: none;
}

.related {
  border-top: 1px solid var(--color-divider);
}

/* ---------------------------- ABOUT ---------------------------- */

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: var(--space-16);
  align-items: start;
}

.about-portrait {
  aspect-ratio: 4/5;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface-offset);
  position: sticky;
  top: calc(var(--space-16) + 60px);
}
.about-portrait img { width: 100%; height: 100%; object-fit: cover; }

.credential-list { display: flex; flex-direction: column; gap: var(--space-4); margin-top: var(--space-8); }
.credential-list li {
  display: flex;
  gap: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-divider);
  font-size: var(--text-sm);
}
.credential-list strong { color: var(--color-text); min-width: 9rem; flex-shrink: 0; }
.credential-list span { color: var(--color-text-muted); }

/* ---------------------------- CONTACT STRIP ---------------------------- */

.contact-strip {
  background: var(--color-text);
  color: var(--color-text-inverse);
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-10), 6vw, var(--space-16));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}
[data-theme='dark'] .contact-strip { background: var(--color-surface-offset-2); color: var(--color-text); }

.contact-strip h2 { font-size: var(--text-xl); font-weight: 400; max-width: 24ch; }
.contact-strip .btn--primary { background: var(--color-text-inverse); color: var(--color-text); }
[data-theme='dark'] .contact-strip .btn--primary { background: var(--color-primary); color: var(--color-text-inverse); }
.contact-strip .btn--primary:hover { opacity: 0.85; }
.contact-strip .btn--ghost { color: var(--color-text-inverse); border-color: var(--color-text-inverse); }
[data-theme='dark'] .contact-strip .btn--ghost { color: var(--color-text); border-color: var(--color-border); }

.contact-links { display: flex; gap: var(--space-4); flex-wrap: wrap; }

/* ---------------------------- FOOTER ---------------------------- */

.site-footer {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-12);
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-8);
  flex-wrap: wrap;
}

.footer-grid .wordmark { margin-bottom: var(--space-3); }
.footer-note { font-size: var(--text-sm); color: var(--color-text-muted); max-width: 32ch; }

.footer-links { display: flex; gap: var(--space-16); flex-wrap: wrap; }
.footer-links h4 { font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-text-faint); margin-bottom: var(--space-3); }
.footer-links ul { display: flex; flex-direction: column; gap: var(--space-2); }
.footer-links a { font-size: var(--text-sm); color: var(--color-text-muted); }
.footer-links a:hover { color: var(--color-primary); }

.footer-bottom {
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
  display: flex;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* ---------------------------- RESPONSIVE ---------------------------- */

/* ---------------------------- SCROLL REVEAL ---------------------------- */
/* Fade-in-on-scroll, matching the style-guide reference's "Others" animation set. */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 700ms cubic-bezier(0.16, 1, 0.3, 1), transform 700ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

@media (max-width: 900px) {
  .hero__grid { grid-template-columns: 1fr; gap: var(--space-8); }
  .hero__meta { align-items: flex-start; text-align: left; }
  .feature { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; }
  .about-portrait { position: static; max-width: 280px; }

  /* Mobile nav: hide links, show hamburger */
  .main-nav { position: relative; }
  .main-nav ul { display: none; }
  /* !important overrides the base display:none rule at equal specificity */
  .nav-toggle { display: flex !important; }

  /* Nav dropdown when open */
  [data-main-nav][data-open='true'] > ul {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: calc(100% + var(--space-4));
    right: 0;
    min-width: 200px;
    background: var(--color-surface);
    border: 1px solid var(--color-divider);
    box-shadow: var(--shadow-md);
    z-index: 100;
    padding: var(--space-2) 0;
  }

  [data-main-nav][data-open='true'] > ul li { border-bottom: 1px solid var(--color-divider); }
  [data-main-nav][data-open='true'] > ul li:last-child { border-bottom: none; }
  [data-main-nav][data-open='true'] > ul a {
    display: block;
    padding: var(--space-4) var(--space-6);
    font-size: var(--text-sm);
  }
}

@media (max-width: 640px) {
  .card-grid { grid-template-columns: 1fr; }
  .footer-grid { flex-direction: column; }
  .footer-links { gap: var(--space-8); }
  .section-head { flex-direction: column; gap: var(--space-2); align-items: flex-start; }

  /* Article head: loosen max-width constraint on narrow screens */
  .article-head h1 { max-width: none; }
  .article-head .dek { max-width: none; }

  /* Byline: allow wrap */
  .byline { flex-wrap: wrap; }

  /* Article actions: stack on very small screens */
  .article-actions { flex-wrap: wrap; }

  /* Feature: reduce padding */
  .feature { padding: var(--space-5); }

  /* Contact strip: stack and stretch buttons to full width */
  .contact-strip { flex-direction: column; align-items: stretch; }
  .contact-strip .btn, .contact-strip a.btn { width: 100%; justify-content: center; }
  .contact-links { width: 100%; flex-direction: column; }
  .contact-links .btn, .contact-links a.btn { width: 100%; justify-content: center; }
}

@media (max-width: 400px) {
  .site-header__inner { gap: var(--space-3); }
  .wordmark small { display: none; }
}