/* Rihuan Huang — personal site */

/* Source Han, SIL Open Font License 1.1 */
@font-face {
  font-family: "Source Han Serif SC";
  src: local("Source Han Serif SC"), local("SourceHanSerifSC-SemiBold"),
       url("../fonts/SourceHanSerifSC-SemiBold.subset.6d89fab5.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
  unicode-range: U+2000-206F, U+3000-303F, U+4E00-9FFF, U+FF00-FFEF;
}
@font-face {
  font-family: "Source Han Sans SC";
  src: local("Source Han Sans SC"), local("SourceHanSansSC-Regular"),
       url("../fonts/SourceHanSansSC-Regular.subset.6d89fab5.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
  unicode-range: U+2000-206F, U+3000-303F, U+4E00-9FFF, U+FF00-FFEF;
}
@font-face {
  font-family: "Source Han Sans SC";
  src: local("Source Han Sans SC Bold"), local("SourceHanSansSC-Bold"),
       url("../fonts/SourceHanSansSC-Bold.subset.6d89fab5.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
  unicode-range: U+2000-206F, U+3000-303F, U+4E00-9FFF, U+FF00-FFEF;
}

:root {
  --wrap:      1280px;
  --pad:       24px;
  --gap:       40px;
  --col-left:  220px;
  --col-right: 200px;
  --head-h:    64px;

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Cambria, Constantia,
           "Source Han Serif SC", "Songti SC", serif;
  --sans:  -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
           "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono:  ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;

  --green:  #5a6b3b;
  --green-d:#414f28;
  --cream:  #f0e2b8;
  --red:    #c6502c;
  --ground: #fbf7ec;
  --ink:    #26261f;
  --muted:  #6f6e61;
  --muted-d:#4a4940;
  --rule:   #e5ddc7;
}

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

html {
  font-size: 18px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--head-h) + 24px);
}

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--green); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--red); }

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--pad);
}

/* Masthead */
.masthead {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--ground);
  border-bottom: 1px solid var(--rule);
}
.masthead .wrap {
  height: var(--head-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.brand {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--green); }

.mainnav { display: flex; gap: 1.6rem; }
.mainnav a {
  font-size: 0.85rem;
  color: var(--muted);
  text-decoration: none;
  padding: 2px 0;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}
.mainnav a:hover { color: var(--ink); border-bottom-color: var(--red); }
.mainnav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--red); }

.mainnav .langswitch {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  padding: 0.22rem 0.5rem;
  border: 1px solid var(--rule);
  border-radius: 3px;
  color: var(--green-d);
  background: transparent;
}
.mainnav .langswitch:hover {
  background: var(--green);
  border-color: var(--green);
  color: var(--ground);
}

/* Banner */
.banner {
  margin-top: 20px;
  border-radius: 4px;
  overflow: hidden;
  background: var(--cream);
}
.banner svg { display: block; width: 100%; height: auto; }

/* Layout */
.layout {
  display: grid;
  grid-template-columns: var(--col-left) minmax(0, 1fr) var(--col-right);
  gap: var(--gap);
  align-items: start;
  padding-bottom: 4rem;
}
.layout--2col { grid-template-columns: var(--col-left) minmax(0, 1fr); }

/* Profile column */
.profile { position: sticky; top: calc(var(--head-h) + 24px); }
.profile__photo {
  margin-top: -70px;
  position: relative;
  z-index: 2;
  border: 5px solid var(--ground);
  border-radius: 3px;
  box-shadow: 0 1px 6px rgba(0,0,0,.10);
}
.layout--slim .profile__photo { margin-top: -40px; }

.profile__name {
  font-family: var(--serif);
  font-size: 1.5rem;
  line-height: 1.15;
  margin: 0.7rem 0 0.15rem;
  letter-spacing: -0.015em;
}
.profile__role { margin: 0 0 0.9rem; font-size: 0.9rem; color: var(--red); font-weight: 600; }
.profile__affil { margin: 0 0 1.1rem; font-size: 0.85rem; color: var(--muted); line-height: 1.45; }

.profile__links { list-style: none; margin: 0; padding: 1rem 0 0; border-top: 2px solid var(--cream); }
.profile__links li {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 0.55rem;
  font-size: 0.85rem;
}
.profile__links a {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex: 1;
  min-width: 0;
  color: var(--ink);
  text-decoration: none;
}
.profile__links a:hover { color: var(--green); }
.profile__links a:hover .ico { background: var(--green); color: var(--ground); }
.ico {
  flex: 0 0 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 3px;
  background: var(--cream);
  color: var(--green-d);
}
.ico svg { width: 13px; height: 13px; fill: currentColor; }

/* Section nav */
.toc { position: sticky; top: calc(var(--head-h) + 24px); font-size: 0.82rem; }
.toc__label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.8rem;
}
.toc ol { list-style: none; margin: 0; padding: 0; border-left: 2px solid var(--rule); }
.toc li a {
  display: block;
  padding: 0.42rem 0 0.42rem 0.9rem;
  margin-left: -2px;
  border-left: 2px solid transparent;
  color: var(--muted);
  text-decoration: none;
}
.toc li a:hover { color: var(--ink); }
.toc li a.is-active {
  color: var(--green-d);
  font-weight: 600;
  border-left-color: var(--red);
}

/* Sections */
.section { padding: 3.2rem 0; border-top: 1px solid var(--rule); }
.section:first-child { padding-top: 2.2rem; border-top: 0; }

.section__title {
  font-family: var(--serif);
  font-size: 2.3rem;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 1.1rem;
}
.lead {
  font-size: 1.12rem;
  line-height: 1.55;
  color: var(--green-d);
  margin: 0 0 1.5rem;
  max-width: 34em;
}
.section p { margin: 0 0 1.05rem; max-width: 36em; }

.h3 {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--green-d);
  margin: 2.2rem 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--cream);
}
.h3:first-of-type { margin-top: 1rem; }

/* Buttons */
.actions { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 1.6rem 0 0; }
.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  font-size: 0.84rem;
  font-weight: 600;
  border-radius: 3px;
  text-decoration: none;
  background: var(--green);
  color: var(--ground);
}
.btn:hover { background: var(--green-d); color: var(--ground); }
.btn--ghost { background: transparent; color: var(--green-d); box-shadow: inset 0 0 0 1.5px var(--cream); }
.btn--ghost:hover { background: var(--cream); color: var(--green-d); }

/* Publication lists */
.pubs { list-style: none; margin: 0; padding: 0; counter-reset: pub; }
.pubs > li {
  position: relative;
  padding: 0 0 1.4rem 2.6rem;
  margin-bottom: 1.4rem;
  border-bottom: 1px solid var(--rule);
}
.pubs > li:last-child { border-bottom: 0; margin-bottom: 0; padding-bottom: 0; }
.pubs > li::before {
  counter-increment: pub;
  content: counter(pub, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.15rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--red);
}
.pub__title { display: block; font-weight: 600; line-height: 1.4; margin-bottom: 0.25rem; }
.pub__meta { display: block; font-size: 0.9rem; color: var(--muted-d); line-height: 1.5; }
.pub__venue { font-family: var(--serif); font-style: italic; color: var(--ink); }
.pub__year { font-family: var(--mono); font-size: 0.85em; white-space: nowrap; }

.tagline {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.5rem;
  padding: 0.22rem 0.6rem;
  border-radius: 3px;
  background: var(--cream);
  font-size: 0.78rem;
  color: var(--green-d);
}
.doc {
  display: inline-block;
  margin-left: 0.45rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  padding: 0.1rem 0.42rem;
  border-radius: 2px;
  background: var(--green);
  color: var(--ground);
  text-decoration: none;
  vertical-align: 1px;
}
.doc:hover { background: var(--red); color: var(--ground); }

/* Teaching */
.course { margin-bottom: 1.5rem; }
.course__code { font-family: var(--mono); font-size: 0.8rem; color: var(--red); }
.course__name { font-weight: 600; margin: 0.1rem 0 0.5rem; }
.course__name span { font-weight: 400; color: var(--muted); font-size: 0.9rem; }
.terms { display: flex; flex-wrap: wrap; gap: 0.4rem; list-style: none; margin: 0; padding: 0; }
.terms li {
  font-family: var(--mono);
  font-size: 0.74rem;
  padding: 0.2rem 0.5rem;
  border-radius: 2px;
  background: var(--cream);
  color: var(--green-d);
}
.terms li b { font-weight: 700; }

.note { font-size: 0.82rem; color: var(--muted); margin-top: -0.4rem; }

.plain { list-style: none; margin: 0 0 1rem; padding: 0; font-size: 0.92rem; }
.plain li {
  padding: 0.3rem 0;
  border-bottom: 1px dotted var(--rule);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}
.plain li:last-child { border-bottom: 0; }
.plain .yr { font-family: var(--mono); font-size: 0.8rem; color: var(--muted); white-space: nowrap; }

.plain--tight li {
  display: grid;
  grid-template-columns: 3.2rem 5.6rem auto;
  justify-content: start;
  gap: 0 1.4rem;
  border-bottom: 0;
  padding: 0.22rem 0;
}
.plain--tight .km { font-family: var(--mono); font-size: 0.82rem; color: var(--ink); }
.plain--tight .n  { font-size: 0.78rem; color: var(--muted); }

/* Races */
.races { list-style: none; margin: 0; padding: 0; font-size: 0.92rem; }
.races li {
  display: grid;
  grid-template-columns: 5.6rem 1fr 4.6rem 4.6rem;
  gap: 0.8rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
}
.races li:last-child { border-bottom: 0; }
.races .d { font-family: var(--mono); font-size: 0.78rem; color: var(--muted); }
.races .ev {
  justify-self: start;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--green-d);
  background: var(--cream);
  padding: 0.12rem 0.45rem;
  border-radius: 2px;
  white-space: nowrap;
}
.races .doc { margin-left: 0; }

/* Photo gallery */
.photo { margin: 0 0 2.6rem; }
.photo img,
.strip img {
  width: 100%;
  height: auto;
  border-radius: 3px;
  background: var(--cream);
}
.photo__cap {
  margin: 0 0 0.55rem;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--green-d);
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: baseline;
}
.photo__date {
  font-family: var(--mono);
  font-size: 0.76rem;
  font-weight: 400;
  color: var(--red);
  white-space: nowrap;
}

.strip { display: grid; gap: 0.9rem; margin: 0 0 2.6rem; }
@media (min-width: 620px) {
  .strip--2 { grid-template-columns: 1fr 1fr; }
  .strip--3 { grid-template-columns: repeat(3, 1fr); }
}
.strip figure { margin: 0; }
.strip figcaption { margin-top: 0.45rem; font-size: 0.82rem; color: var(--muted); }
.strip figcaption b {
  display: block;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--red);
}

.sign-off { margin-top: 2.6rem; }

/* Footer */
.foot { border-top: 1px solid var(--rule); background: var(--cream); }
.foot .wrap { padding-top: 2rem; padding-bottom: 2rem; font-size: 0.82rem; color: var(--green-d); }
.foot a { color: var(--green-d); }

/* Narrow screens */
@media (max-width: 1080px) {
  .layout { grid-template-columns: var(--col-left) minmax(0, 1fr); }
  .toc { display: none; }
}
@media (max-width: 720px) {
  html { font-size: 16.5px; }
  .layout, .layout--2col { grid-template-columns: 1fr; gap: 1.5rem; }
  .profile { position: static; }
  .profile__photo { margin-top: -50px; width: 150px; }
  .mainnav { gap: 1rem; }
  .mainnav a { font-size: 0.8rem; }
  .section__title { font-size: 1.8rem; }
  .races li { grid-template-columns: 1fr auto; gap: 0.2rem 0.6rem; }
  .races .d { grid-column: 1 / -1; }
}