/* =====================================================================
   Ashley (Ye) Gao — personal site  ·  DARK EDITION (two-column spread)
   Concept: "Marble to Voice" on black — a pinned identity panel on the
   left, a dense content column on the right, rose-coral accent, and a
   signature waveform under the name.
   ===================================================================== */

:root {
  --bg:        #0a0a0b;
  --bg-2:      #141315;
  --bg-card:   #121113;
  --ink:       #f1eee8;
  --slate:     #a8a39d;
  --faint:     #6d6863;
  --line:      #2a282c;
  --line-soft: #1c1b1e;
  --rose:      #e0838b;
  --rose-hi:   #eea6ac;
  --rose-dim:  #b56069;

  --serif: "Spectral", Georgia, "Times New Roman", serif;
  --sans:  "Hanken Grotesk", system-ui, -apple-system, sans-serif;
  --mono:  "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --shell:   1140px;
  --side-w:  320px;
  --gap-section: 3.6rem;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0rem;
  line-height: 1.66;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    radial-gradient(55% 45% at 16% 2%, rgba(224, 131, 139, 0.10), transparent 60%),
    radial-gradient(70% 55% at 100% 100%, rgba(224, 131, 139, 0.05), transparent 55%);
}

a { color: var(--rose); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--rose-hi); }
:focus-visible { outline: 2px solid var(--rose); outline-offset: 3px; border-radius: 2px; }
img { max-width: 100%; display: block; }

/* ------------------------------------------------------------------ NAV */
.nav {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(1.1) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}
.nav.scrolled { border-bottom-color: var(--line); }
.nav-inner {
  max-width: var(--shell);
  margin-inline: auto;
  padding: 0.85rem 1.6rem;
  display: flex; align-items: baseline; justify-content: space-between; gap: 1rem;
}
.nav-name { font-family: var(--serif); font-weight: 500; font-size: 1rem; letter-spacing: 0.01em; color: var(--ink); }
.nav-name a { color: inherit; }
.nav-links { display: flex; gap: 1.4rem; font-size: 0.82rem; letter-spacing: 0.01em; }
.nav-links a { color: var(--slate); font-weight: 500; position: relative; }
.nav-links a:hover { color: var(--rose); }
.nav-links a.active { color: var(--ink); }
.nav-links a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -5px;
  height: 1.5px; background: var(--rose); border-radius: 2px;
}
@media (max-width: 720px) { .nav-links { display: none; } }

/* ---------------------------------------------------------------- SHELL */
.shell {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: 1.6rem;
  display: grid;
  grid-template-columns: var(--side-w) 1fr;
  gap: 3rem;
  align-items: start;
}

/* --------------------------------------------------------------- SIDEBAR */
.side { position: sticky; top: 4.5rem; padding-top: 3rem; }

.side .portrait {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-2);
  margin-bottom: 1.5rem;
  box-shadow:
    0 1px 0 rgba(255,255,255,0.04) inset,
    0 24px 50px -26px rgba(0,0,0,0.85),
    0 0 44px -20px rgba(224,131,139,0.55);
}
.side .portrait img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 22%; }
.side .portrait::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(180deg, transparent 58%, rgba(10,10,11,0.4));
}

.eyebrow {
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.15em;
  text-transform: uppercase; color: var(--rose); margin: 0 0 0.7rem;
}
.side-name {
  font-family: var(--serif); font-weight: 500;
  font-size: clamp(2rem, 1.4rem + 1.4vw, 2.5rem);
  line-height: 1.05; letter-spacing: -0.015em; margin: 0; color: var(--ink);
}
.side-name em { font-style: italic; font-weight: 400; color: var(--slate); }

.sig {
  display: block; width: min(100%, 240px); height: 24px;
  margin: 0.7rem 0 1.2rem; overflow: visible;
  filter: drop-shadow(0 0 6px rgba(224,131,139,0.35));
}
.sig path { fill: none; stroke: var(--rose); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.sig .draw { stroke-dasharray: 620; stroke-dashoffset: 620; animation: draw 2.1s cubic-bezier(0.6,0.02,0.2,1) 0.35s forwards; }
@keyframes draw { to { stroke-dashoffset: 0; } }
@media (prefers-reduced-motion: reduce) { .sig .draw { animation: none; stroke-dashoffset: 0; } }

.side-role { font-size: 0.95rem; color: var(--ink); margin: 0 0 0.2rem; font-weight: 500; }
.side-role .sub { display: block; color: var(--faint); font-weight: 400; font-size: 0.86rem; margin-top: 0.1rem; }
.side-lede {
  font-family: var(--serif); font-style: italic; font-size: 1.02rem; line-height: 1.5;
  color: var(--slate); margin: 1rem 0 1.3rem;
}

.links { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.link-chip {
  font-family: var(--mono); font-size: 0.76rem; letter-spacing: 0.02em;
  color: var(--ink); border: 1px solid var(--line); background: var(--bg-2);
  border-radius: 999px; padding: 0.38rem 0.85rem;
  transition: border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
.link-chip:hover { color: var(--rose-hi); border-color: var(--rose-dim); transform: translateY(-1px); }

/* --------------------------------------------------------------- CONTENT */
.content { min-width: 0; padding-top: 3rem; }

.section { padding-top: 0; }
.content > .section:first-child { padding-top: 0.5rem; }
.content > .section + .section {
  border-top: 1px solid var(--line-soft);
  margin-top: 2.4rem;
  padding-top: 2.4rem;
}

.sec-head { display: flex; align-items: baseline; gap: 0.9rem; margin-bottom: 1.6rem; }
.sec-num { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; color: var(--faint); padding-top: 0.35rem; }
.sec-title { font-family: var(--serif); font-weight: 500; font-size: 1.55rem; letter-spacing: -0.01em; margin: 0; color: var(--ink); }

.prose p { margin: 0 0 1rem; color: var(--ink); }
.prose p.muted { color: var(--slate); }
.prose .lead { font-family: var(--serif); font-style: italic; font-size: 1.18rem; line-height: 1.5; color: var(--ink); margin-bottom: 1.1rem; }

/* research directions */
.dirs { list-style: none; margin: 1.4rem 0 0; padding: 0; display: grid; gap: 0.1rem; }
.dir { border-top: 1px solid var(--line-soft); padding: 0.9rem 0; display: grid; grid-template-columns: auto 1fr; gap: 0.9rem; }
.dir:last-child { border-bottom: 1px solid var(--line-soft); }
.dir-key { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.08em; color: var(--rose); padding-top: 0.28rem; }
.dir-title { font-weight: 600; color: var(--ink); }
.dir-desc { color: var(--slate); font-size: 0.94rem; display: block; margin-top: 0.1rem; }

/* recent */
.recent { list-style: none; margin: 0; padding: 0; }
.recent li { display: grid; grid-template-columns: 4rem 1fr; gap: 1rem; padding: 0.65rem 0; border-top: 1px solid var(--line-soft); }
.recent li:last-child { border-bottom: 1px solid var(--line-soft); }
.recent .when { font-family: var(--mono); font-size: 0.74rem; color: var(--faint); padding-top: 0.15rem; letter-spacing: 0.02em; }
.recent .what { color: var(--ink); }
.recent .what b { font-weight: 600; }

/* publications */
.pub-year { font-family: var(--mono); font-size: 0.76rem; letter-spacing: 0.12em; color: var(--rose); margin: 1.7rem 0 0.3rem; }
.pub-year:first-of-type { margin-top: 0; }
.pub { padding: 0.8rem 0; border-top: 1px solid var(--line-soft); }
.pub-top { display: flex; align-items: center; gap: 0.7rem; flex-wrap: wrap; margin-bottom: 0.3rem; }
.venue {
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.03em; color: var(--rose);
  background: color-mix(in srgb, var(--rose) 12%, var(--bg-2));
  border: 1px solid color-mix(in srgb, var(--rose) 30%, var(--line));
  border-radius: 4px; padding: 0.16rem 0.5rem; white-space: nowrap;
}
.award { font-family: var(--sans); font-size: 0.72rem; font-weight: 600; letter-spacing: 0.02em; color: var(--rose); }
.pub-title { font-family: var(--serif); font-size: 1.05rem; line-height: 1.38; color: var(--ink); margin: 0 0 0.18rem; }
.pub-authors { font-size: 0.86rem; color: var(--slate); line-height: 1.5; }
.pub-authors .me { color: var(--ink); font-weight: 600; }
.more-link { display: inline-block; margin-top: 1.5rem; font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.02em; }
.more-link::after { content: " \2197"; }

/* teaching */
.courses { list-style: none; margin: 0; padding: 0; }
.course { display: grid; grid-template-columns: 6.5rem 1fr auto; gap: 1rem; align-items: baseline; padding: 0.8rem 0; border-top: 1px solid var(--line-soft); }
.course:last-child { border-bottom: 1px solid var(--line-soft); }
.course-code { font-family: var(--mono); font-size: 0.78rem; color: var(--rose); letter-spacing: 0.01em; }
.course-name { color: var(--ink); font-weight: 500; }
.course-name small { display: block; color: var(--faint); font-weight: 400; font-size: 0.78rem; letter-spacing: 0.04em; text-transform: uppercase; margin-top: 0.1rem; }
.course-years { font-family: var(--mono); font-size: 0.76rem; color: var(--slate); text-align: right; }
@media (max-width: 560px) { .course { grid-template-columns: 1fr auto; } .course-code { grid-column: 1 / -1; } }

/* lab — student cards */
.lab-intro { color: var(--slate); margin-bottom: 1.6rem; max-width: 46em; }
.people-group { margin-bottom: 1.5rem; }
.people-label { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); margin-bottom: 0.8rem; }
.people { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; }
.person {
  display: grid; grid-template-columns: 1fr auto; gap: 0.1rem 0.6rem; align-items: baseline;
  background: var(--bg-card); border: 1px solid var(--line); border-radius: 10px;
  padding: 0.85rem 0.95rem; transition: border-color 0.2s ease, transform 0.2s ease;
}
.person:hover { border-color: var(--rose-dim); transform: translateY(-1px); }
.person-name { grid-column: 1; grid-row: 1; font-weight: 600; color: var(--ink); }
.person-year { grid-column: 2; grid-row: 1; margin-left: auto; font-family: var(--mono); font-size: 0.72rem; color: var(--faint); white-space: nowrap; }
.person-meta { grid-column: 1 / -1; font-size: 0.84rem; color: var(--slate); }
.person-note { grid-column: 1 / -1; font-size: 0.78rem; color: var(--rose); font-weight: 500; margin-top: 0.1rem; }
@media (max-width: 560px) { .people { grid-template-columns: 1fr; } }

/* service / honors columns */
.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem 2.6rem; }
@media (max-width: 620px) { .cols { grid-template-columns: 1fr; gap: 1.8rem; } }
.mini-label { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); margin: 0 0 0.6rem; }
.stack { list-style: none; margin: 0; padding: 0; }
.stack li { padding: 0.45rem 0; border-top: 1px solid var(--line-soft); font-size: 0.92rem; color: var(--ink); display: flex; justify-content: space-between; gap: 1rem; }
.stack li:first-child { border-top: none; }
.stack .yr { font-family: var(--mono); font-size: 0.74rem; color: var(--faint); white-space: nowrap; }
.stack .sub { color: var(--slate); }

/* writing — work cards */
.writing-lede { font-family: var(--serif); font-style: italic; font-size: 1.12rem; color: var(--slate); max-width: 42em; margin: 0 0 1.6rem; }
.works { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; }
.work {
  display: grid; grid-template-columns: 1fr auto; gap: 0.35rem 0.8rem; align-items: baseline;
  background: var(--bg-card); border: 1px solid var(--line); border-radius: 10px;
  padding: 1rem 1.05rem; transition: border-color 0.2s ease, transform 0.2s ease;
}
.work:hover { border-color: var(--rose-dim); transform: translateY(-1px); }
.work-title { grid-column: 1; font-family: var(--serif); font-style: italic; font-size: 1.1rem; color: var(--ink); }
.work-tag { grid-column: 2; text-align: right; font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.03em; color: var(--rose); white-space: nowrap; }
.work-meta { grid-column: 1 / -1; font-size: 0.84rem; color: var(--slate); }
@media (max-width: 560px) { .works { grid-template-columns: 1fr; } }

/* prospective students — recruitment call-out */
.recruit {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1.7rem 1.8rem;
  overflow: hidden;
}
.recruit::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: linear-gradient(180deg, var(--rose), var(--rose-dim));
}
.recruit::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(58% 80% at 100% 0%, rgba(224,131,139,0.08), transparent 62%);
}
.recruit p { margin: 0 0 0.9rem; color: var(--ink); position: relative; }
.recruit p:last-child { margin-bottom: 0; }

.recruit .recruit-status {
  display: inline-flex; align-items: center; gap: 0.55rem;
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--rose); margin-bottom: 1rem;
}
.recruit-status .dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--rose);
  box-shadow: 0 0 0 0 rgba(224,131,139,0.5);
  animation: pulse 2.6s ease-out infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(224,131,139,0.45); }
  70%  { box-shadow: 0 0 0 9px rgba(224,131,139,0); }
  100% { box-shadow: 0 0 0 0 rgba(224,131,139,0); }
}
@media (prefers-reduced-motion: reduce) { .recruit-status .dot { animation: none; } }

.recruit .recruit-lead {
  font-family: var(--serif); font-style: italic; font-size: 1.22rem; line-height: 1.45;
  color: var(--ink); margin-bottom: 1rem;
}
.recruit .recruit-sub { color: var(--slate); }
.recruit .recruit-label {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--faint); margin: 1.3rem 0 0;
}
.tags { list-style: none; margin: 0.7rem 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tags li {
  font-size: 0.82rem; color: var(--ink); background: var(--bg-2);
  border: 1px solid var(--line); border-radius: 999px; padding: 0.32rem 0.8rem;
}
.recruit .recruit-note { color: var(--slate); margin-top: 1.3rem; }

.recruit-cta { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; margin-top: 1.4rem; }
.btn {
  display: inline-block; font-family: var(--sans); font-weight: 600; font-size: 0.9rem;
  color: var(--bg); background: var(--rose); border: 1px solid var(--rose);
  border-radius: 999px; padding: 0.55rem 1.25rem; white-space: nowrap;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.btn:hover { background: var(--rose-hi); border-color: var(--rose-hi); color: var(--bg); transform: translateY(-1px); }
.cta-hint { font-size: 0.84rem; color: var(--slate); max-width: 32em; }

/* footer */
.footer { margin-top: var(--gap-section); border-top: 1px solid var(--line); }
.footer-inner {
  max-width: var(--shell); margin-inline: auto; padding: 2.2rem 1.6rem 3.2rem;
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; align-items: baseline;
}
.footer p { margin: 0; color: var(--slate); font-size: 0.86rem; }
.footer .foot-links { display: flex; gap: 1.2rem; font-family: var(--mono); font-size: 0.78rem; }
.footer .foot-links a { color: var(--slate); }
.footer .foot-links a:hover { color: var(--rose); }

/* reveal */
.reveal { opacity: 1; transform: none; }
.js-motion .reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.6s ease, transform 0.6s ease; }
.js-motion .reveal.in { opacity: 1; transform: none; }

/* ---------------------------------------------------------- RESPONSIVE */
@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; gap: 1.5rem; }
  .side { position: static; padding-top: 2.5rem; max-width: 560px; }
  .side .portrait { width: 220px; aspect-ratio: 4 / 5; }
  .content { padding-top: 0; }
  .content > .section:first-child { padding-top: var(--gap-section); border-top: 1px solid var(--line-soft); margin-top: 0.5rem; }
}