/* Hallmark · genre: editorial · macrostructure: Long Document
 * design-system: design.md · designed-as-app
 * theme: custom (Yale-blue anchor) · nav: N6 masthead · footer: Ft8 minimal
 * pre-emit critique: P5 H5 E5 S4 R5 V4
 * contrast: pass (40–41) · slop: pass (42–45) · honest: pass (46)
 * chrome: pass (47) · tokens: pass (48) · responsive: pass (49)
 * icons: pass (30) · mobile: pass (34, 49, 50–57)
 */

@import url("tokens.css");

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

html,
body {
  overflow-x: clip;
}

html {
  background: var(--color-paper);
}

body {
  margin: 0;
  padding: 0;
  color: var(--color-ink);
  background: var(--color-paper);
  font-family: var(--font-body);
  font-size: var(--text-md);
  font-weight: 400;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "cv02";
}

/* -- Page frame ------------------------------------------------------------ */

.page {
  max-width: 44rem;
  margin: 0 auto;
  padding: var(--space-md) var(--space-md) var(--space-3xl);
}

@media (min-width: 720px) {
  .page {
    padding: var(--space-md) var(--space-lg) var(--space-3xl);
  }
}

/* -- Masthead (N6) --------------------------------------------------------- */

.masthead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: var(--rule-hairline) solid var(--color-rule);
  margin-bottom: var(--space-lg);
}

.masthead__wordmark {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--text-xl);
  letter-spacing: -0.015em;
  color: var(--color-accent);
  text-decoration: none;
}

.masthead__wordmark:hover {
  color: var(--color-ink);
}

.masthead__nav {
  display: flex;
  gap: var(--space-md);
}

.masthead__nav a {
  color: var(--color-ink-2);
  font-size: var(--text-sm);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: var(--rule-hairline) solid transparent;
  transition: color var(--dur-short) var(--ease-out),
              border-color var(--dur-short) var(--ease-out);
}

.masthead__nav a:hover {
  color: var(--color-ink);
  border-bottom-color: var(--color-ink);
}

.masthead__nav a[aria-current="page"] {
  color: var(--color-ink);
  border-bottom-color: var(--color-accent);
}

@media (max-width: 520px) {
  .masthead {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
  .masthead__nav {
    gap: var(--space-sm);
    flex-wrap: wrap;
  }
}

/* -- Utilities ------------------------------------------------------------- */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* -- Typography ------------------------------------------------------------ */

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-style: normal;
  color: var(--color-ink);
  letter-spacing: -0.01em;
  overflow-wrap: anywhere;
  min-width: 0;
}

h1 {
  font-size: var(--text-display);
  line-height: 1.05;
  margin: 0 0 var(--space-lg) 0;
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--text-xl);
  line-height: 1.25;
  margin: var(--space-2xl) 0 var(--space-md) 0;
  padding-bottom: var(--space-2xs);
  border-bottom: var(--rule-hairline) solid var(--color-accent);
}

h2:first-of-type {
  margin-top: var(--space-xl);
}

h3 {
  font-size: var(--text-md);
  font-weight: 500;
  line-height: 1.3;
  margin: 0 0 var(--space-2xs) 0;
}

p {
  margin: 0 0 var(--space-sm) 0;
  max-width: 62ch;
}

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: text-decoration-thickness var(--dur-short) var(--ease-out),
              text-underline-offset var(--dur-short) var(--ease-out);
}

a:hover {
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

a:active {
  color: var(--color-ink);
}

strong,
b {
  font-weight: 700;
}

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: var(--radius-input);
}

/* -- Home header ----------------------------------------------------------- */

.home-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 180px;
  gap: var(--space-xl);
  align-items: start;
  margin-bottom: var(--space-2xl);
}

.home-header__intro > *:last-child {
  margin-bottom: 0;
}

.home-header__contact {
  margin-top: var(--space-md);
  font-size: var(--text-sm);
  color: var(--color-ink-2);
}

.home-header__contact a {
  color: var(--color-accent);
}

.headshot {
  width: 180px;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  background: var(--color-paper-2);
  border: var(--rule-hairline) solid var(--color-rule);
}

.headshot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

@media (max-width: 620px) {
  .home-header {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-md);
  }
  .headshot {
    width: 140px;
    order: -1;
    justify-self: center;
  }
}

/* -- Research entries ------------------------------------------------------ */

.paper {
  padding: var(--space-md) 0;
  border-top: var(--rule-hairline) solid var(--color-rule);
}

.paper:first-of-type {
  border-top: none;
  padding-top: 0;
}

.paper__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-md);
  color: var(--color-ink);
  margin: 0 0 var(--space-3xs) 0;
  letter-spacing: -0.005em;
}

.paper__jmp-tag {
  font-weight: 400;
  color: var(--color-ink-2);
}

.paper__coauthors {
  font-size: var(--text-sm);
  color: var(--color-ink-2);
  margin: 0 0 var(--space-2xs) 0;
}

.paper__abstract {
  margin: var(--space-2xs) 0;
}

.paper__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  align-items: baseline;
  margin-top: var(--space-2xs);
  font-size: var(--text-sm);
}

.paper__meta a {
  color: var(--color-accent);
}

.paper__status {
  color: var(--color-ink-2);
}

/* -- CV -------------------------------------------------------------------- */

.cv-download {
  font-size: var(--text-sm);
  color: var(--color-ink-2);
  margin-bottom: var(--space-md);
}

.cv-embed {
  width: 100%;
  height: 82vh;
  border: var(--rule-hairline) solid var(--color-rule);
  background: var(--color-paper-2);
  display: block;
}

/* -- Reduced motion (nothing to cut — already still) ---------------------- */

@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}