/* ============================================================
   Components — navigation, buttons, cards, forms, footer
   ============================================================ */

/* Skip link */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  z-index: 999;
}
.skip-link:focus { top: var(--space-4); }

/* ------------ Header ------------ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--color-bg) 90%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}
.site-header--scrolled {
  border-bottom-color: var(--color-divider);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding-block: var(--space-4);
}
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
  border-bottom: none;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  letter-spacing: -0.02em;
}
.site-brand__mark { width: 32px; height: 32px; }
.site-brand__logo {
  display: block;
  height: 44px;
  width: auto;
  max-width: 100%;
}
.site-brand__logo--footer {
  height: 40px;
  opacity: 0.95;
}
@media (max-width: 640px) {
  .site-brand__logo { height: 36px; }
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.site-nav__list {
  display: flex;
  gap: var(--space-5);
  align-items: center;
}
.site-nav__link {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  border-bottom: none;
  padding-block: var(--space-2);
  position: relative;
}
.site-nav__link:hover { color: var(--color-text); }
.site-nav__link--active { color: var(--color-text); }
.site-nav__link--active::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--color-highlight);
  border-radius: var(--radius-pill);
}

.nav-toggle {
  display: none;
  padding: var(--space-2);
  color: var(--color-text);
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: fixed;
    inset: 64px 0 auto 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-divider);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-6) var(--space-5);
    transform: translateY(-120%);
    transition: transform var(--transition-slow);
  }
  .site-nav--open { transform: translateY(0); }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-4);
  }
  .site-nav__link { font-size: var(--text-base); }
}

/* ------------ Buttons ------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  letter-spacing: 0.005em;
  transition:
    background var(--transition-interactive),
    color var(--transition-interactive),
    border-color var(--transition-interactive),
    transform var(--transition-interactive);
}
.btn:hover { transform: translateY(-1px); }
.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}
.btn--primary:hover { background: var(--color-primary-hover); }
.btn--highlight {
  background: var(--color-highlight);
  color: #FFFFFF;
}
.btn--highlight:hover { background: var(--color-highlight-hover); }
.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--ghost:hover {
  background: var(--color-surface-offset);
  border-color: var(--color-text-muted);
}
.btn--large {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

/* ------------ Cards ------------ */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: clamp(var(--space-6), 3vw, var(--space-8));
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive), border-color var(--transition-interactive);
}
.card--interactive:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-border);
}
.card__eyebrow {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-highlight);
  font-weight: 500;
  margin-bottom: var(--space-3);
}
.card__title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
}
.card__body {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.6;
}
.card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-primary);
  border-bottom: 1px solid transparent;
}
.card__link:hover { border-bottom-color: currentColor; }

/* ------------ Grid utilities ------------ */
.grid {
  display: grid;
  gap: clamp(var(--space-4), 2vw, var(--space-6));
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 900px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 600px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

/* ------------ Eyebrow / section labels ------------ */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-highlight);
  font-weight: 500;
  margin-bottom: var(--space-4);
}
.eyebrow::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 1px;
  background: currentColor;
}

.section-title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-5);
  max-width: 20ch;
}
.section-intro {
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  max-width: 55ch;
  margin-bottom: var(--space-10);
}

/* ------------ Forms ------------ */
.form {
  display: grid;
  gap: var(--space-4);
}
.form__row {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr 1fr;
}
@media (max-width: 600px) { .form__row { grid-template-columns: 1fr; } }
.form__field {
  display: grid;
  gap: var(--space-2);
}
.form__label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
}
.form__control {
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  color: var(--color-text);
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}
.form__control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--color-primary) 15%, transparent);
}
textarea.form__control {
  min-height: 140px;
  resize: vertical;
  font-family: inherit;
}

/* ------------ Footer ------------ */
.site-footer {
  background: var(--color-surface-offset);
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-16) var(--space-8);
  margin-top: var(--space-24);
}
.site-footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}
@media (max-width: 900px) {
  .site-footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .site-footer__grid { grid-template-columns: 1fr; }
}
.site-footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  max-width: 42ch;
}
.site-footer__col-title {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}
.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.site-footer__list a {
  color: var(--color-text-muted);
  border-bottom: none;
  font-size: var(--text-sm);
}
.site-footer__list a:hover { color: var(--color-text); }
.site-footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  flex-wrap: wrap;
}

/* ------------ Hero variations ------------ */
.hero {
  padding-block: clamp(var(--space-16), 10vw, var(--space-32));
  position: relative;
}
.hero__eyebrow { margin-bottom: var(--space-5); }
.hero__title {
  font-size: var(--text-3xl);
  max-width: 22ch;
  margin-bottom: var(--space-6);
  line-height: 1.02;
}
.hero__lead {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 58ch;
  margin-bottom: var(--space-8);
}
.hero__cta {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Page hero (interior pages) — smaller than home */
.page-hero {
  padding-block: clamp(var(--space-16), 8vw, var(--space-24)) clamp(var(--space-10), 5vw, var(--space-16));
  border-bottom: 1px solid var(--color-divider);
}
.page-hero__title {
  font-size: var(--text-2xl);
  max-width: 26ch;
  margin-bottom: var(--space-4);
}
.page-hero__lead {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 58ch;
}

/* ------------ Split media ------------ */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(var(--space-8), 5vw, var(--space-16));
  align-items: center;
}
@media (max-width: 900px) { .split { grid-template-columns: 1fr; } }
.split--reverse { direction: rtl; }
.split--reverse > * { direction: ltr; }

/* ------------ Callout ------------ */
.callout {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: clamp(var(--space-10), 6vw, var(--space-20));
  border-radius: var(--radius-lg);
  display: grid;
  gap: var(--space-6);
}
.callout__title {
  color: var(--color-text-inverse);
  font-size: var(--text-2xl);
  max-width: 26ch;
}
.callout__body {
  color: color-mix(in oklab, var(--color-text-inverse) 80%, transparent);
  max-width: 60ch;
}

/* ------------ Publications and press lists ------------ */
.pubs {
  display: flex;
  flex-direction: column;
}
.pub {
  padding-block: var(--space-6);
  border-bottom: 1px solid var(--color-divider);
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: var(--space-6);
  align-items: baseline;
}
@media (max-width: 700px) {
  .pub { grid-template-columns: 1fr; gap: var(--space-2); }
}
.pub__year {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}
.pub__title {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  font-weight: 500;
  line-height: 1.5;
}
.pub__meta {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-style: italic;
}

/* ------------ Portrait blocks ------------ */
.portrait {
  aspect-ratio: 4 / 5;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--color-surface-offset);
}
.portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ------------ Credential chips ------------ */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-6);
}
.chip {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* ------------ Service list ------------ */
.service-list {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-6);
}
.service-list li {
  padding-left: var(--space-6);
  position: relative;
  color: var(--color-text-muted);
  line-height: 1.55;
  max-width: 62ch;
}
.service-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: var(--space-4);
  height: 1px;
  background: var(--color-highlight);
}

/* ------------ Speaking topics ------------ */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}
@media (max-width: 700px) { .topic-grid { grid-template-columns: 1fr; } }
.topic {
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
}
.topic__title {
  font-family: var(--font-body);
  font-weight: 500;
  color: var(--color-text);
  font-size: var(--text-base);
  margin-bottom: var(--space-2);
}
.topic__body {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ------------ Project cards ------------ */
.project {
  display: grid;
  gap: var(--space-4);
}
.project__cover {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-surface-offset);
  position: relative;
}
.project__cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.project__cover:hover img { transform: scale(1.03); }
.project__status {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  padding: var(--space-1) var(--space-3);
  background: color-mix(in oklab, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.project__title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}
.project__meta {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}
.project__body {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ------------ Motion utility ------------ */
/* Use JS-added class .js-motion to opt-in to hidden state.
   Content is visible by default so no-JS / reduced-motion users see everything. */
.js-motion .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);
}
.js-motion .reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .js-motion .reveal { opacity: 1; transform: none; transition: none; }
}

/* ------------ Section blocks (generic) ------------ */
.section {
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
}
.section--tight {
  padding-block: clamp(var(--space-8), 4vw, var(--space-12));
}

/* ------------ Publications list (new richer version) ------------ */
.pubs-list {
  list-style: none;
  padding: 0;
  margin: var(--space-8) 0 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}
.pubs-list .pub {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: var(--space-6);
  padding-block: var(--space-6);
  border-top: 1px solid var(--color-divider);
}
.pubs-list .pub:first-child { border-top: 0; padding-top: 0; }
.pubs-list .pub__year {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-highlight);
  letter-spacing: 0.02em;
}
.pubs-list .pub__body { display: flex; flex-direction: column; gap: var(--space-3); }
.pubs-list .pub__citation {
  font-size: var(--text-base);
  color: var(--color-text);
  line-height: 1.6;
  margin: 0;
}
.pubs-list .pub__tags { margin: 0; display: flex; flex-wrap: wrap; gap: var(--space-2); }
@media (max-width: 640px) {
  .pubs-list .pub { grid-template-columns: 1fr; gap: var(--space-2); }
}

/* ------------ Contact form ------------ */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}
.form-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.form-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: 0.01em;
}
.form-input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  font-family: inherit;
  font-size: var(--text-base);
  line-height: 1.4;
  transition: border-color 180ms ease, box-shadow 180ms ease;
}
.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 18%, transparent);
}
textarea.form-input { resize: vertical; min-height: 140px; }

/* ------------ Contact details list ------------ */
.contact-details {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--color-divider);
}
.contact-details__row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: var(--space-4);
  padding-block: var(--space-4);
  border-bottom: 1px solid var(--color-divider);
  align-items: baseline;
}
.contact-details dt {
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.contact-details dd {
  margin: 0;
  color: var(--color-text);
  font-size: var(--text-base);
}
.contact-details dd a { color: var(--color-primary); }
.contact-details dd a:hover { color: var(--color-primary-hover); }
@media (max-width: 640px) {
  .contact-details__row { grid-template-columns: 1fr; gap: var(--space-1); }
}

/* ------------ Split layout — mobile fix ------------ */
@media (max-width: 900px) {
  .split { grid-template-columns: 1fr !important; }
}