/*
  Site styles, loaded after semantic.min.css.

  Principles:
  - One column with one left edge. Navbar, page content, and footer all use .site-col.
  - The column is a white sheet (.sheet) on a grey page; teasers and photos have white
    backgrounds, so the sheet stays white and only the surroundings are tinted.
  - Spacing encodes grouping: items inside a group sit 0-8px apart, groups 16-32px,
    sections 64px. Use the --s* tokens (8 / 16 / 24 / 32 / 64) only.
  - Running prose is 19px; lists and metadata (news, citations, card details) are 17px.
  - One typeface everywhere: Source Serif 4 (variable, weights 400-700, self-hosted with
    its OFL licence in static/fonts/source-serif-4/).
  - NC State red is the only accent. Metadata (dates, types, venues, statistics) is muted grey.
*/

/* ---------- Fonts ---------- */

@font-face {
  font-family: "Source Serif 4";
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url("../fonts/source-serif-4/source-serif-4-normal-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Source Serif 4";
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url("../fonts/source-serif-4/source-serif-4-normal-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: "Source Serif 4";
  font-style: italic;
  font-weight: 400 700;
  font-display: swap;
  src: url("../fonts/source-serif-4/source-serif-4-italic-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Source Serif 4";
  font-style: italic;
  font-weight: 400 700;
  font-display: swap;
  src: url("../fonts/source-serif-4/source-serif-4-italic-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

:root {
  --red: #cc0000;      /* Wolfpack Red: links, awards */
  --red-deep: #990000; /* Reynolds Red: navbar */
  --ink: rgba(0, 0, 0, 0.87);
  --muted: #666;
  --rule: #e4e4e4;
  --page-bg: #f0f0f0; /* outside the column */
  --sheet-bg: #fff;   /* the column */

  --font-text: "Source Serif 4", Georgia, "Times New Roman", serif;
  --fs-xs: 15px;
  --fs-sm: 17px;
  --fs-base: 19px;
  --fs-md: 21px;
  --fs-lg: 26px;
  --fs-xl: 34px;
  --lh: 1.6;
  --lh-tight: 1.3;

  --s1: 8px;
  --s2: 16px;
  --s3: 24px;
  --s4: 32px;
  --s5: 64px;

  --col: 760px;   /* about 75 characters of 19px Source Serif 4 */
  --gutter: 48px; /* sheet padding; text keeps this distance from the sheet edge */
  --nav-h: 52px;
}

/* ---------- Base ---------- */

body {
  background: var(--page-bg);
  color: var(--ink);
  font-family: var(--font-text);
  font-size: var(--fs-base);
  line-height: var(--lh);
}

/* Semantic UI sets Lato on headings directly. */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-text);
}

p {
  margin: 0 0 var(--s2);
  line-height: var(--lh);
}

a {
  color: var(--red);
}

a:hover {
  color: var(--red);
  text-decoration: underline;
}

.sheet {
  box-sizing: border-box;
  max-width: calc(var(--col) + 2 * var(--gutter));
  min-height: 100vh;
  margin: 0 auto;
  padding-top: calc(var(--nav-h) + 48px);
  background: var(--sheet-bg);
}

.site-col {
  box-sizing: border-box;
  width: 100%;
  max-width: calc(var(--col) + 2 * var(--gutter));
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ---------- Navbar ---------- */

.topnav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  background: var(--red-deep);
}

.topnav-inner {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  column-gap: 28px;
  min-height: var(--nav-h);
}

.topnav a {
  display: flex;
  align-items: center;
  height: var(--nav-h);
  border-top: 3px solid transparent;
  border-bottom: 3px solid transparent;
  color: #fff;
  font-size: 18px;
}

.topnav a:hover {
  color: #fff;
  text-decoration: none;
  border-bottom-color: rgba(255, 255, 255, 0.5);
}

.topnav a.active {
  border-bottom-color: #fff;
}

.topnav a.icon {
  display: none;
  margin-left: auto;
}

.topnav a.icon i.icon {
  margin: 0;
}

/* ---------- Page scaffolding ---------- */

.page-title {
  margin: 0 0 var(--s4);
  font-size: var(--fs-xl);
  line-height: var(--lh-tight);
}

.page-subtitle {
  margin: calc(-1 * var(--s4) + var(--s1)) 0 var(--s4);
  color: var(--muted);
  font-size: var(--fs-sm);
}

.page-note {
  margin: 0 0 var(--s4);
  color: var(--muted);
  font-size: var(--fs-sm);
}

.page-note p {
  margin: 0;
}

.page-note + .section {
  margin-top: var(--s4);
}

.section {
  margin-top: var(--s5);
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s2);
  margin-bottom: var(--s2);
  padding-bottom: var(--s1);
  border-bottom: 1px solid var(--rule);
}

.section-head h2 {
  margin: 0;
  font-size: var(--fs-lg);
  line-height: var(--lh-tight);
}

.section-head a {
  font-size: var(--fs-sm);
  white-space: nowrap;
}

.site-footer {
  margin-top: var(--s5);
  padding: var(--s2) 0 var(--s4);
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: var(--fs-xs);
}

/* ---------- Prose (markdown content) ---------- */

.prose > :first-child {
  margin-top: 0;
}

.prose h1 {
  margin: 0 0 var(--s4);
  font-size: var(--fs-xl);
  line-height: var(--lh-tight);
}

.prose h2 {
  margin: var(--s5) 0 var(--s2);
  font-size: var(--fs-lg);
  line-height: var(--lh-tight);
}

.prose h3 {
  margin: var(--s4) 0 var(--s1);
  font-size: var(--fs-md);
  line-height: var(--lh-tight);
}

.prose h4 {
  margin: var(--s2) 0 var(--s1);
  font-size: var(--fs-base);
  line-height: var(--lh-tight);
}

.prose ul,
.prose ol {
  margin: 0 0 var(--s2);
  padding-left: 1.4em;
}

.prose li {
  margin-bottom: var(--s1);
}

.prose hr {
  margin: var(--s5) 0 var(--s4);
  border: 0;
  border-top: 1px solid var(--rule);
}

/* ---------- Homepage profile ----------
   Photo on the left spanning two groups: identity (name, role) and
   contact (address, email, Scholar). On small screens the photo
   shrinks beside the identity group and contact moves below. */

.profile {
  display: grid;
  grid-template-columns: 160px 1fr;
  grid-template-areas:
    "photo id"
    "photo more";
  grid-template-rows: auto 1fr;
  column-gap: var(--s4);
  row-gap: var(--s2);
}

.profile-photo {
  grid-area: photo;
  width: 160px;
  height: 160px;
}

.profile-id {
  grid-area: id;
}

.profile-more {
  grid-area: more;
}

.profile-name {
  margin: 0 0 4px;
  font-size: var(--fs-xl);
  line-height: var(--lh-tight);
}

.profile-role {
  color: var(--muted);
  line-height: 1.45;
}

/* Title and department share a line; institution gets its own.
   Small screens give each part its own line. */
.profile-role-inst {
  display: block;
}

.profile-contact {
  display: flex;
  flex-wrap: wrap;
  column-gap: var(--s3);
  row-gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--fs-sm);
}

.profile-contact li {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.profile-contact .profile-address {
  flex-basis: 100%;
}

.profile-contact i.icon {
  flex: none;
  width: 1.1em;
  margin: 0;
  color: var(--muted);
}

.bio {
  margin-top: var(--s4);
}

/* Research thrusts (thrust shortcode): title and summary read as one group,
   the paper-link line sits just below at list size, thrusts are 24px apart. */

.thrust {
  margin-top: var(--s3);
}

.thrust p {
  margin: 0;
}

.thrust-title {
  font-weight: 600;
}

.thrust .thrust-refs {
  margin-top: var(--s1);
  font-size: var(--fs-sm);
  line-height: 1.5;
}

/* Keep each keyword on one line; the separator's leading no-break space
   keeps the dot attached to the keyword before it. */
.thrust-refs a {
  white-space: nowrap;
}

.thrust-sep {
  color: var(--muted);
}

/* ---------- News timeline (home and News page) ---------- */

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

.timeline-item {
  display: grid;
  grid-template-columns: 64px 96px 1fr;
  column-gap: var(--s2);
  align-items: baseline;
  padding: var(--s1) 0;
}

.timeline-date,
.timeline-type {
  color: var(--muted);
  font-size: var(--fs-sm);
}

.timeline-date {
  font-variant-numeric: tabular-nums;
}

.timeline-text {
  font-size: var(--fs-sm);
}

.timeline-text p {
  margin: 0;
}

/* ---------- Selected publication cards (home) ---------- */

.pub-card {
  display: flex;
  align-items: flex-start;
  gap: var(--s4);
  padding: var(--s3) 0;
  border-top: 1px solid var(--rule);
}

.pub-card:first-child {
  padding-top: var(--s1);
  border-top: 0;
}

.pub-card:last-child {
  padding-bottom: 0;
}

.pub-teaser {
  flex: 0 0 200px;
}

.pub-teaser img {
  display: block;
  max-width: 100%;
  max-height: 150px;
}

.pub-body {
  flex: 1;
  min-width: 0;
}

.pub-title {
  margin-bottom: var(--s1);
  font-size: var(--fs-md);
  font-weight: 700;
  line-height: var(--lh-tight);
}

.pub-title a {
  color: var(--ink);
}

.pub-title a:hover {
  color: var(--red);
}

.pub-authors,
.pub-venue,
.pub-award {
  font-size: var(--fs-sm);
  line-height: 1.5;
}

.pub-venue {
  color: var(--muted);
}

.pub-award {
  margin-top: 4px;
  color: var(--red);
  font-weight: 700;
}

/* ---------- Publication list page ---------- */

.pub-group h2 {
  margin: 0;
}

.pub-entries {
  margin: 0;
  padding: 0;
  list-style: none;
}

.pub-entry {
  display: grid;
  grid-template-columns: 3.2em 1fr;
  column-gap: var(--s1);
  align-items: baseline;
  margin-bottom: var(--s2);
  font-size: var(--fs-sm);
}

.pub-num {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.pub-text p {
  display: inline;
  margin: 0;
}

.pub-text .ui.label {
  margin-left: 4px;
  padding: 2px 6px;
  font-size: 13px;
  vertical-align: 1px;
}

/* Citation notes from the colour shortcode. */
.cite-award {
  color: var(--red);
}

.cite-stat {
  color: var(--muted);
}

/* ---------- Teaching ---------- */

.course {
  display: grid;
  grid-template-columns: 96px 1fr;
  column-gap: var(--s2);
  align-items: baseline;
  padding: var(--s3) 0;
  border-top: 1px solid var(--rule);
}

.course:first-child {
  padding-top: 0;
  border-top: 0;
}

.course-term {
  color: var(--muted);
  font-size: var(--fs-sm);
}

.course-title {
  margin: 0 0 4px;
  font-size: var(--fs-md);
  line-height: var(--lh-tight);
}

.course-title a {
  color: var(--ink);
}

.course-title a:hover {
  color: var(--red);
}

.course-code {
  margin-bottom: var(--s1);
  color: var(--muted);
  font-size: var(--fs-sm);
}

.course-summary {
  font-size: var(--fs-sm);
}

.course-summary p {
  margin: 0;
}

/* ---------- Lab ---------- */

.people {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s4) var(--s2);
}

.person img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  object-fit: cover;
  margin-bottom: var(--s1);
}

.person-name {
  font-size: var(--fs-sm);
  font-weight: 700;
  line-height: var(--lh-tight);
}

.person-role {
  color: var(--muted);
  font-size: var(--fs-xs);
}

.alumni-item {
  grid-template-columns: 64px 1fr;
}

.alumni-next {
  color: var(--muted);
  font-size: var(--fs-sm);
}

/* ---------- Small screens ---------- */

@media (max-width: 600px) {
  :root {
    --gutter: 20px;
  }

  .sheet {
    padding-top: calc(var(--nav-h) + var(--s4));
  }

  .topnav a:not(:first-child):not(.icon) {
    display: none;
  }

  .topnav a.icon {
    display: flex;
  }

  .topnav.responsive .topnav-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .topnav.responsive a:not(.icon) {
    display: flex;
    height: 44px;
  }

  .topnav a.icon:hover {
    border-bottom-color: transparent;
  }

  .topnav.responsive a.icon {
    position: absolute;
    top: 0;
    right: var(--gutter);
  }

  .profile {
    grid-template-columns: 88px 1fr;
    grid-template-areas:
      "photo id"
      "more more";
    grid-template-rows: auto auto;
    column-gap: var(--s2);
    align-items: center;
  }

  .profile-photo {
    width: 88px;
    height: 88px;
  }

  .profile-role {
    font-size: var(--fs-xs);
  }

  .profile-role > span {
    display: block;
  }

  .profile-role-sep {
    display: none;
  }

  .timeline-item {
    grid-template-columns: auto 1fr;
    row-gap: 2px;
  }

  .timeline-text {
    grid-column: 1 / -1;
  }

  .alumni-item {
    grid-template-columns: 48px 1fr;
  }

  .alumni-item .timeline-text {
    grid-column: auto;
  }

  .pub-card {
    flex-direction: column;
    gap: var(--s2);
  }

  .pub-teaser {
    flex-basis: auto;
  }

  .pub-teaser img {
    max-height: 180px;
  }

  .course {
    grid-template-columns: 1fr;
    row-gap: 4px;
  }

  .people {
    grid-template-columns: repeat(2, 1fr);
  }
}