/* =========================================================================
   Field Notes — personal website of Gaofei Shen
   Warm paper, ink text, editorial serif, monospace metadata.
   Tilburg Marine #003366, Brons #cc9933.
   ========================================================================= */

:root {
  --paper:      #f7f2e8;
  --ink:        #211e19;
  --ink-soft:   #544e46;
  --marine:     #003366;
  --marine-ink: #002a55;
  --brons:      #cc9933;
  --brons-soft: rgba(204, 153, 51, 0.42);
  --rule:       rgba(33, 30, 25, 0.14);

  --measure:    38rem;
  --gutter:     clamp(1.25rem, 5vw, 2.5rem);

  --font-display: "Fraunces", "Newsreader", Georgia, "Times New Roman", serif;
  --font-body:    "Newsreader", Georgia, "Times New Roman", serif;
  --font-ipa:     "Noto Serif", "Newsreader", "Gentium Plus", "Charis SIL",
                  "Doulos SIL", "DejaVu Serif", Georgia, serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo,
                  Consolas, monospace;
}

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

html { text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: clamp(1.0625rem, 0.95rem + 0.3vw, 1.1875rem);
  line-height: 1.72;
  font-kerning: normal;
  font-variant-ligatures: common-ligatures;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--paper);
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='0.2'/%3E%3C/svg%3E"),
    radial-gradient(120% 70% at 12% -12%, rgba(204, 153, 51, 0.13), transparent 62%),
    radial-gradient(90% 60% at 104% 2%, rgba(0, 51, 102, 0.07), transparent 58%);
  background-repeat: repeat, no-repeat, no-repeat;
  background-attachment: fixed;
}

/* --- layout shell ------------------------------------------------------- */

.wrap {
  width: 100%;
  max-width: calc(var(--measure) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.site-main {
  flex: 1 0 auto;
  padding-block: clamp(2.5rem, 7vw, 4.25rem) clamp(3rem, 8vw, 5rem);
}

.site-main:focus { outline: none; }

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

.site-main a,
.site-footer a {
  color: var(--marine);
  text-decoration: underline;
  text-decoration-color: rgba(0, 51, 102, 0.34);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

.site-main a:hover,
.site-footer a:hover {
  color: var(--marine-ink);
  text-decoration-color: currentColor;
}

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

::selection {
  background: rgba(204, 153, 51, 0.3);
  color: var(--ink);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 10;
  padding: 0.6rem 0.9rem;
  background: var(--marine);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-decoration: none;
}

.skip-link:focus {
  left: 0.75rem;
  top: 0.75rem;
}

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

.site-header { padding-top: clamp(1.75rem, 5vw, 3rem); }

.site-header__inner {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--rule);
}

.site-header__inner::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 3.25rem;
  height: 2px;
  background: var(--brons);
}

.site-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.12rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
}

.site-title:hover { color: var(--marine); }

.site-nav {
  display: flex;
  gap: clamp(1rem, 3vw, 1.75rem);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  padding-bottom: 0.15rem;
  border-bottom: 2px solid transparent;
}

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

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

/* --- typography --------------------------------------------------------- */

h1, h2, h3 { text-wrap: balance; }

.site-main h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.9rem, 5vw, 2.5rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}

.site-main p { margin: 0 0 1.15rem; }

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

.page-note {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
  margin: 0 0 clamp(1.75rem, 4vw, 2.25rem);
}

/* --- home: masthead ----------------------------------------------------- */

.masthead { margin-bottom: clamp(2.25rem, 5vw, 3.25rem); }

.masthead__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.6rem, 9vw, 4rem);
  line-height: 0.98;
  letter-spacing: -0.028em;
  margin: 0;
  font-variation-settings: "opsz" 120;
}

.masthead__ipa {
  font-family: var(--font-ipa);
  font-style: italic;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
  color: var(--ink-soft);
  margin: 0.7rem 0 0;
}

.facts {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.35rem 1.25rem;
  margin: 1.9rem 0 0;
  font-size: 0.98rem;
}

.facts dt {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  align-self: center;
  padding-top: 0.15em;
}

.facts dd { margin: 0; }

.lede { font-size: 1.06em; }

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

.section { margin-top: clamp(2.5rem, 6vw, 3.5rem); }

.section__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.35rem, 3.2vw, 1.6rem);
  letter-spacing: -0.012em;
  line-height: 1.2;
  margin: 0 0 1.1rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--rule);
}

.interests {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
  font-size: 1.02em;
}

.interests li {
  position: relative;
  padding-left: 1.5rem;
}

.interests li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 0.6rem;
  height: 1px;
  background: var(--brons);
}

/* --- publications ------------------------------------------------------- */

.pub-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.5rem);
}

.pub {
  display: grid;
  grid-template-columns: 4.25rem 1fr;
  column-gap: clamp(1rem, 3vw, 1.75rem);
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
}

.pub__year {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--marine);
  margin: 0.2rem 0 0;
}

.pub__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.2rem;
  line-height: 1.3;
  letter-spacing: -0.008em;
  margin: 0;
}

.pub__authors {
  margin: 0.55rem 0 0;
  font-size: 0.97rem;
  color: var(--ink-soft);
}

.pub__authors strong {
  font-weight: 600;
  color: var(--ink);
}

.pub__meta {
  margin: 0.5rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: var(--ink-soft);
}

.pub__meta .sep {
  padding: 0 0.5rem;
  color: var(--brons);
}

.pub__links {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  margin: 0.65rem 0 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.pub__links li + li::before {
  content: "·";
  color: var(--brons-soft);
  padding: 0 0.65rem;
}

/* --- photography -------------------------------------------------------- */

.prose { max-width: 34rem; }

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

.site-footer { padding-bottom: clamp(2rem, 6vw, 3rem); }

.hairline {
  position: relative;
  height: 1px;
  background: var(--rule);
}

.hairline::after {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 3.25rem;
  height: 2px;
  background: var(--brons);
}

.elsewhere {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.6rem;
  margin-top: 1.6rem;
  font-family: var(--font-mono);
  font-size: 0.77rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.elsewhere a {
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 51, 102, 0.24);
  padding-bottom: 0.1rem;
}

.elsewhere a:hover { border-bottom-color: currentColor; }

.colophon {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1.25rem;
  margin: 1.35rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.03em;
  color: var(--ink-soft);
}

.updated {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.28rem 0.65rem;
  border: 1px solid var(--brons-soft);
  border-radius: 999px;
}

.updated__dot {
  width: 0.35rem;
  height: 0.35rem;
  border-radius: 50%;
  background: var(--brons);
}

.colophon__copyright { margin-left: auto; }

/* --- narrow screens ----------------------------------------------------- */

@media (max-width: 34rem) {
  .pub {
    grid-template-columns: 1fr;
    row-gap: 0.4rem;
  }

  .pub__year { margin-top: 0; font-size: 0.74rem; }

  .facts { gap: 0.35rem 1rem; }

  .colophon__copyright { margin-left: 0; }
}

/* --- print -------------------------------------------------------------- */

@media print {
  body {
    background: #fff;
    color: #000;
  }

  .site-nav,
  .elsewhere,
  .skip-link { display: none; }

  .site-main a,
  .site-footer a { color: #000; }
}