/* =========================================================
   John Terhorst, Ph.D. — Design System
   North Star: "The Faculty Folio"
   ========================================================= */

/* === Tokens === */
:root {
  --color-ink-blue:   #2563eb;
  --color-deep-ink:   #1e40af;
  --color-ink-wash:   #eef4ff;
  --color-paper:      #f7f7f3;
  --color-card-white: #ffffff;
  --color-slate:      #1f2933;
  --color-ash:        #5f6b76;
  --color-chalk:      #e5e7eb;

  --space-1:  0.25rem;   /*  4px */
  --space-2:  0.5rem;    /*  8px */
  --space-3:  0.75rem;   /* 12px */
  --space-4:  1rem;      /* 16px */
  --space-6:  1.5rem;    /* 24px */
  --space-8:  2rem;      /* 32px */
  --space-12: 3rem;      /* 48px */
  --space-16: 4rem;      /* 64px */
  --space-24: 6rem;      /* 96px */

  --font-stack: "Source Serif 4", Georgia, "Times New Roman", serif;

  --radius-pill: 999px;
  --radius-lg:   1.25rem;

  --shadow-card: 0 10px 25px rgba(15, 23, 42, 0.06);

  --container: min(1100px, calc(100% - 3rem));
}

/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-stack);
  font-optical-sizing: auto;
  background: var(--color-paper);
  color: var(--color-slate);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

figure { margin: 0; }
blockquote { margin: 0; padding: 0; }
dl { margin: 0; }

h1, h2, h3, h4 {
  text-wrap: balance;
  margin-top: 0;
  line-height: 1.2;
}

article p, section p { text-wrap: pretty; }

a { color: var(--color-ink-blue); }
a:hover { color: var(--color-deep-ink); }

/* === Site Header === */
.site-header {
  min-height: 380px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: var(--space-12) var(--space-6);
  text-align: center;
  background: linear-gradient(160deg, var(--color-ink-wash) 0%, var(--color-card-white) 55%);
  border-bottom: 1px solid var(--color-chalk);
}

.kicker {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  color: var(--color-deep-ink);
  margin: 0 0 var(--space-3);
}

.site-header h1 {
  margin: 0 auto var(--space-4);
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 700;
  line-height: 1.1;
  max-width: 22ch;
  letter-spacing: -0.02em;
}

.site-header p {
  margin: 0 auto;
  max-width: 54ch;
  color: var(--color-ash);
  font-size: 1.05rem;
  line-height: 1.65;
}

/* === Site Navigation === */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0 var(--space-8);
  padding: var(--space-3) var(--space-6);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-chalk);
}

.site-nav a {
  color: var(--color-slate);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 600;
  padding: var(--space-3) 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.site-nav a:hover { color: var(--color-ink-blue); }

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

/* === Main Container === */
main {
  width: var(--container);
  margin: 0 auto;
  padding: var(--space-12) 0 var(--space-24);
}

/* === Section Label (used as visual heading above lists) === */
.section-label {
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  color: var(--color-ash);
  margin: 0 0 var(--space-4);
}

/* === Ruled List === */
.ruled-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.ruled-list li {
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-chalk);
  font-size: 0.95rem;
  color: var(--color-slate);
  line-height: 1.5;
}

.ruled-list li:first-child { border-top: 1px solid var(--color-chalk); }

.credentials__subsection { margin-top: var(--space-8); }

/* === Button === */
.button {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius-pill);
  background: var(--color-ink-blue);
  color: var(--color-card-white);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.01em;
  transition: background 0.15s ease;
}

.button:hover {
  background: var(--color-deep-ink);
  color: var(--color-card-white);
}

/* === Footer === */
footer {
  border-top: 1px solid var(--color-chalk);
  padding: var(--space-8) var(--space-6);
  text-align: center;
  color: var(--color-ash);
  font-size: 0.85rem;
}


/* ====================================================
   HOME PAGE
   ==================================================== */

/* Credentials: two-column (Education left, Awards right) */
.credentials {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-8) var(--space-16);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid var(--color-chalk);
  margin-bottom: var(--space-12);
  align-items: start;
}

/* Award list */
.award-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.award-list__item {
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-chalk);
}

.award-list__item:first-child { border-top: 1px solid var(--color-chalk); }

.award-list__name {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-slate);
  line-height: 1.45;
  margin-bottom: var(--space-1);
}

.award-list__org {
  display: block;
  font-size: 0.78rem;
  color: var(--color-ash);
  letter-spacing: 0.01em;
}

/* Page link navigation (01 / 02 / 03) */
.page-links { display: flex; flex-direction: column; }

.page-link {
  display: grid;
  grid-template-columns: 2.5rem 1fr auto;
  align-items: center;
  gap: var(--space-6);
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--color-chalk);
  text-decoration: none;
  color: var(--color-slate);
  transition: color 0.15s ease;
}

.page-link:hover { color: var(--color-ink-blue); }

.page-link__num {
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--color-chalk);
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  transition: color 0.15s ease;
}

.page-link:hover .page-link__num { color: var(--color-ink-blue); }

.page-link__title {
  display: block;
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-1);
}

.page-link__desc {
  display: block;
  font-size: 0.875rem;
  color: var(--color-ash);
  line-height: 1.5;
}

.page-link__arrow {
  font-size: 1.1rem;
  color: var(--color-chalk);
  flex-shrink: 0;
  transition: color 0.15s ease;
}

.page-link:hover .page-link__arrow { color: var(--color-ink-blue); }


/* ====================================================
   TUTORING PAGE
   ==================================================== */

/* Two-column intro */
.page-intro {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-8) var(--space-16);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid var(--color-chalk);
  margin-bottom: var(--space-12);
  align-items: start;
}

.page-intro__text p {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--color-slate);
  margin: 0 0 var(--space-4);
  max-width: 60ch;
}

.page-intro__text p:last-child { margin-bottom: 0; }

/* Fact list (key/value pairs) */
.fact-list {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-6);
  display: flex;
  flex-direction: column;
}

.fact-list__item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-4);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-chalk);
  font-size: 0.875rem;
}

.fact-list__item:first-child { border-top: 1px solid var(--color-chalk); }

.fact-list__item dt { color: var(--color-ash); }

.fact-list__item dd {
  margin: 0;
  font-weight: 600;
  color: var(--color-slate);
  text-align: right;
}

/* Subjects */
.subjects {
  margin-bottom: var(--space-12);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid var(--color-chalk);
}

.subject-tags {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.subject-tags li {
  font-size: 0.875rem;
  padding: var(--space-2) var(--space-4);
  background: var(--color-card-white);
  border: 1px solid var(--color-chalk);
  border-radius: var(--radius-pill);
  color: var(--color-slate);
  line-height: 1.4;
}

/* Testimonials */
.testimonials__heading {
  margin-bottom: var(--space-8);
}

.testimonial--featured {
  padding: var(--space-6) 0;
  border-top: 1px solid var(--color-chalk);
}

.testimonial--featured blockquote p {
  font-size: 1.15rem;
  font-style: italic;
  line-height: 1.65;
  color: var(--color-slate);
  margin: 0 0 var(--space-3);
}

.testimonial figcaption {
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--color-ash);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* Compact testimonial grid */
.testimonials__compact {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 var(--space-16);
  border-top: 1px solid var(--color-chalk);
  margin-top: var(--space-2);
}

.testimonial--compact {
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--color-chalk);
}

.testimonial--compact blockquote p {
  font-size: 0.9rem;
  font-style: italic;
  line-height: 1.6;
  color: var(--color-ash);
  margin: 0 0 var(--space-2);
}


/* ====================================================
   RESEARCH PAGE
   ==================================================== */

.overview {
  margin-bottom: var(--space-12);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid var(--color-chalk);
}

.overview p {
  font-size: 1.05rem;
  line-height: 1.7;
  margin: 0 0 var(--space-4);
  color: var(--color-slate);
}

.overview p:last-child { margin-bottom: 0; }

/* Numbered project list */
.project {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: var(--space-6);
  padding: var(--space-8) 0;
  border-bottom: 1px solid var(--color-chalk);
}

.project:first-of-type { border-top: 1px solid var(--color-chalk); }

.project__num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-chalk);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  padding-top: 0.1em;
}

.project__title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.35;
  margin: 0 0 var(--space-3);
  color: var(--color-slate);
}

.project__content p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-ash);
  margin: 0 0 var(--space-3);
}

.project__content p:last-child { margin-bottom: 0; }

.project__imgs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.project__img {
  height: 160px;
  width: auto;
  display: block;
  border: 1px solid var(--color-chalk);
}


/* ====================================================
   PUBLICATIONS PAGE
   ==================================================== */

.publications-list {
  border-top: 1px solid var(--color-chalk);
}

.pub {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: var(--space-6);
  padding: var(--space-8) 0;
  border-bottom: 1px solid var(--color-chalk);
}

.pub__year {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-ash);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  padding-top: 0.3em;
  line-height: 1;
}

.pub__title {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.45;
  margin: 0 0 var(--space-2);
  color: var(--color-slate);
}

.pub__authors {
  font-size: 0.9rem;
  color: var(--color-ash);
  margin: 0 0 var(--space-1);
}

.pub__authors strong { color: var(--color-slate); }

.pub__journal {
  font-size: 0.875rem;
  color: var(--color-ash);
  margin: 0 0 var(--space-3);
}

.pub__doi {
  margin: 0;
}

.pub__doi a {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-ink-blue);
  text-decoration: none;
  letter-spacing: 0.01em;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.pub__doi a::before {
  content: "DOI";
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--color-ink-wash);
  color: var(--color-deep-ink);
  padding: 0.1em 0.4em;
  border-radius: 3px;
}

.pub__doi a:hover { color: var(--color-deep-ink); }

.pub--illustrated {
  grid-template-columns: 3.5rem auto 1fr;
}

.pub__thumbs {
  display: flex;
  gap: var(--space-2);
  align-items: flex-start;
  padding-top: 0.3em;
}

.pub__thumb {
  height: 76px;
  width: auto;
  display: block;
  border: 1px solid var(--color-chalk);
}


/* ====================================================
   CV PAGE
   ==================================================== */

.cv-intro {
  margin-bottom: var(--space-12);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid var(--color-chalk);
}

.cv-intro p {
  font-size: 1.05rem;
  line-height: 1.7;
  margin: 0 0 var(--space-6);
  color: var(--color-slate);
}

.cv-section {
  margin-bottom: var(--space-12);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid var(--color-chalk);
}

/* Position / degree entry */
.cv-entry {
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--color-chalk);
}

.cv-entry:first-of-type { border-top: 1px solid var(--color-chalk); }

.cv-entry__role {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-slate);
  margin: 0 0 var(--space-1);
  line-height: 1.3;
}

.cv-entry__meta {
  font-size: 0.875rem;
  color: var(--color-ash);
  margin: 0 0 var(--space-3);
  line-height: 1.5;
}

.cv-entry__meta strong { color: var(--color-slate); }

.cv-entry__list {
  list-style: disc;
  padding-left: 1.25em;
  margin: 0;
}

.cv-entry__list li {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--color-ash);
  padding: var(--space-1) 0;
}

.cv-entry__desc {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--color-ash);
  margin: 0;
  max-width: 68ch;
}

/* Teaching section */
.cv-role-key {
  font-size: 0.78rem;
  color: var(--color-ash);
  margin: 0 0 var(--space-4);
}

.cv-teaching-group { margin-top: var(--space-6); }

.cv-institution-label {
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  color: var(--color-ash);
  margin: 0;
  padding: var(--space-3) 0;
  border-top: 1px solid var(--color-chalk);
}

.cv-course-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.cv-course-list li {
  display: grid;
  grid-template-columns: 9rem 1fr auto;
  gap: 0 var(--space-4);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-chalk);
  align-items: baseline;
}

.cv-course__code {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-slate);
  font-variant-numeric: tabular-nums;
}

.cv-course__name {
  font-size: 0.875rem;
  color: var(--color-slate);
  line-height: 1.4;
}

.cv-course__dates {
  font-size: 0.78rem;
  color: var(--color-ash);
  white-space: nowrap;
  text-align: right;
}

/* Award / fellowship entry */
.cv-award {
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-chalk);
}

.cv-award:first-child { border-top: 1px solid var(--color-chalk); }

.cv-award__name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-slate);
  margin: 0 0 var(--space-1);
  line-height: 1.4;
}

.cv-award__meta {
  font-size: 0.8rem;
  color: var(--color-ash);
  margin: 0 0 var(--space-2);
}

.cv-award__desc {
  font-size: 0.875rem;
  color: var(--color-ash);
  margin: 0;
  line-height: 1.6;
  max-width: 68ch;
}

/* Technical skills key/value rows */
.cv-skill {
  display: grid;
  grid-template-columns: 10rem 1fr;
  gap: 0 var(--space-6);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-chalk);
  align-items: start;
}

.cv-skill:first-child { border-top: 1px solid var(--color-chalk); }

.cv-skill__label {
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  color: var(--color-ash);
  padding-top: 0.2em;
}

.cv-skill__value {
  font-size: 0.875rem;
  color: var(--color-slate);
  line-height: 1.6;
}

/* Presentation entries */
.cv-presentation {
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-chalk);
}

.cv-presentation:first-child { border-top: 1px solid var(--color-chalk); }

.cv-presentation p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--color-ash);
}

.cv-presentation strong { color: var(--color-slate); }

/* Scientific programming entries */
.cv-prog {
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-chalk);
}

.cv-prog:first-child { border-top: 1px solid var(--color-chalk); }

.cv-prog__name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-slate);
  margin: 0 0 var(--space-1);
}

.cv-prog__meta {
  font-size: 0.8rem;
  color: var(--color-ash);
  margin: 0 0 var(--space-2);
}

.cv-prog__desc {
  font-size: 0.875rem;
  color: var(--color-ash);
  margin: 0;
  line-height: 1.6;
  max-width: 68ch;
}


/* ====================================================
   RESPONSIVE
   ==================================================== */

@media (max-width: 680px) {
  :root {
    --space-12: 2.5rem;
    --space-16: 2rem;
  }

  .site-header {
    min-height: 0;
    padding: var(--space-12) var(--space-4) var(--space-8);
  }

  .credentials,
  .page-intro {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .page-link {
    grid-template-columns: 2rem 1fr auto;
    gap: var(--space-3);
  }

  .page-link__title { font-size: 1.05rem; }
  .page-link__desc { font-size: 0.8rem; }

  .testimonials__compact {
    grid-template-columns: 1fr;
  }

  .project {
    grid-template-columns: 2.5rem 1fr;
    gap: var(--space-4);
  }

  .project__num { font-size: 1.5rem; }

  .pub {
    grid-template-columns: 3rem 1fr;
    gap: var(--space-4);
  }

  .pub--illustrated {
    grid-template-columns: 3rem 1fr;
  }

  .pub__thumbs { display: none; }

  .site-nav { gap: 0 var(--space-4); }

  .cv-course-list li {
    grid-template-columns: 1fr;
    gap: var(--space-1) 0;
  }

  .cv-course__dates { text-align: left; }

  .cv-skill {
    grid-template-columns: 1fr;
    gap: var(--space-2) 0;
  }
}