/* ============================================================
   Mingyang Bian — personal academic site (shared stylesheet)
   Self-hosted: system fonts only, no external requests.
   Palette: ink on paper, with a cinnabar-seal accent — a nod to
   the vermilion ruling lines (朱丝栏) of Chinese manuscript paper.
   ============================================================ */

:root {
  --paper:     #FBFAF7;
  --ink:       #221F1C;
  --ink-soft:  #5C564E;
  --seal:      #9C3425;  /* links — dark cinnabar, AA on paper */
  --vermilion: #C8472F;  /* decorative marks and rules */
  --hairline:  #E4DFD6;

  --serif: Charter, "Bitstream Charter", "Iowan Old Style",
           "Palatino Linotype", Palatino, Georgia,
           "Songti SC", SimSun, "Noto Serif CJK SC", serif;
  --sans:  -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
           "Helvetica Neue", Arial,
           "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:     #191715;
    --ink:       #E9E4DC;
    --ink-soft:  #A39B8F;
    --seal:      #E2826D;
    --vermilion: #D05A40;
    --hairline:  #332F2A;
  }
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;          /* 17px */
  line-height: 1.7;
  border-top: 3px solid var(--vermilion);
  -webkit-text-size-adjust: 100%;
}

.wrap {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

::selection {
  background: var(--vermilion);
  color: #FBFAF7;
}

/* ---------- links ---------- */

a {
  color: var(--seal);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.16em;
  text-decoration-color: color-mix(in srgb, var(--seal) 45%, transparent);
}

a:hover {
  text-decoration-thickness: 2px;
  text-decoration-color: var(--seal);
}

a:focus-visible {
  outline: 2px solid var(--vermilion);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---------- skip link ---------- */

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--paper);
  padding: 0.5rem 1rem;
  font-family: var(--sans);
  font-size: 0.875rem;
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
  z-index: 10;
}

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

header {
  padding-top: 4.5rem;
  padding-bottom: 0.5rem;
}

.portrait {
  margin: 0 0 1.75rem;
}

.portrait img {
  width: 7.5rem;
  height: 7.5rem;
  object-fit: cover;
  border-radius: 50%;
  border: 1px solid var(--hairline);
  display: block;
}

h1 {
  font-size: clamp(2rem, 6vw, 2.625rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 0.5rem;
}

h1 a {
  color: inherit;
  text-decoration: none;
}

h1 a:hover {
  color: var(--seal);
}

h1 .zh-name {
  font-weight: 400;
  color: var(--ink-soft);
  white-space: nowrap;
}

.tagline {
  margin: 0;
  font-size: 1.0625rem;
  color: var(--ink-soft);
}

/* ---------- nav ---------- */

nav {
  margin-top: 2.25rem;
  padding: 0.9rem 0;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.4rem;
}

nav a {
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-soft);
}

nav a:hover {
  color: var(--seal);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.3em;
}

nav a[aria-current="page"] {
  color: var(--seal);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.3em;
}

/* ---------- sections ---------- */

section {
  margin-top: 3.5rem;
  scroll-margin-top: 1.5rem;
}

h2 {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.005em;
  margin: 0 0 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

/* cinnabar seal-mark before each section title */
h2::before {
  content: "";
  width: 0.5em;
  height: 0.5em;
  border-radius: 1px;
  background: var(--vermilion);
  flex: none;
}

h3 {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 1.9rem 0 0.7rem;
}

p { margin: 0 0 1.1rem; }

section > :last-child { margin-bottom: 0; }

/* ---------- reference lists (publications, talks): hanging indent ---------- */

.refs p {
  padding-left: 1.6em;
  text-indent: -1.6em;
  margin-bottom: 0.85rem;
}

/* ---------- news list ---------- */

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

.news li {
  margin-bottom: 0.85rem;
  padding-left: 4.4rem;
  position: relative;
}

.news .year {
  position: absolute;
  left: 0;
  top: 0.22em;
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

/* ---------- compact role lists (teaching, service, skills) ---------- */

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

.roles li {
  margin-bottom: 0.7rem;
  padding-left: 1.1rem;
  position: relative;
}

.roles li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 0.32em;
  height: 0.32em;
  background: var(--hairline);
  border-radius: 1px;
}

.note {
  color: var(--ink-soft);
  font-size: 0.97rem;
}

/* ---------- CV entries (degree / award + date, with details) ---------- */

.entry {
  margin-bottom: 1.15rem;
}

.entry-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
  margin: 0;
  font-weight: 700;
}

.entry-when {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  white-space: nowrap;
}

.entry-sub {
  margin: 0.15rem 0 0;
  font-size: 0.97rem;
  color: var(--ink-soft);
}

/* ---------- quiet button (e.g. PDF download) ---------- */

.btn {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--seal);
  border: 1px solid var(--hairline);
  border-radius: 3px;
  padding: 0.5rem 0.9rem;
}

.btn:hover {
  border-color: var(--seal);
  text-decoration: none;
}

/* ---------- contact ---------- */

address {
  font-style: normal;
}

/* ---------- footer ---------- */

footer {
  margin-top: 4rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--hairline);
  font-family: var(--sans);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 1.5rem;
  justify-content: space-between;
}

/* ---------- accessibility & media ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

@media print {
  body { border-top: none; background: #fff; color: #000; }
  nav, .skip-link, .btn { display: none; }
  a { color: #000; text-decoration: none; }
}

@media (max-width: 480px) {
  header { padding-top: 3rem; }
  .news li { padding-left: 0; }
  .news .year { position: static; display: block; margin-bottom: 0.1rem; }
}