/* ------------------------------------------------------------
   Ryan Zhang — personal site
   Scandinavian minimal: warm paper, soft ink, one muted accent.
   ------------------------------------------------------------ */

/* ITC Avant Garde Gothic if the visitor has it; otherwise TeX Gyre Adventor,
   a free revival of it, self-hosted in /fonts (see fonts/_README.md). */
@font-face { font-family: 'Adventor'; src: url('fonts/adventor-regular.woff2') format('woff2'); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: 'Adventor'; src: url('fonts/adventor-italic.woff2') format('woff2'); font-weight: 400; font-style: italic; font-display: swap; }
@font-face { font-family: 'Adventor'; src: url('fonts/adventor-bold.woff2') format('woff2'); font-weight: 600 700; font-style: normal; font-display: swap; }

:root {
  --bg: #f4efe5;          /* Scandinavian off-white, warm beige */
  --surface: #ebe4d6;     /* slightly deeper linen */
  --ink: #1f3a4c;         /* fjord blue */
  --ink-2: #3b5566;       /* secondary text */
  --ink-3: #6a7f8b;       /* tertiary / meta */
  --line: #dbd3c3;        /* hairlines */
  --accent: #2f5d78;      /* brighter fjord for focus/selection */

  --sans: 'ITC Avant Garde Gothic', 'ITC Avant Garde Gothic Pro', 'Avant Garde', 'Adventor', 'Century Gothic', -apple-system, BlinkMacSystemFont, sans-serif;
  --display: var(--sans);
  --mono: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  --measure: 42rem;
  --wide: 67rem;
}


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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; color-scheme: light; overscroll-behavior-x: none; }
body { overscroll-behavior-x: none; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, iframe, video { max-width: 100%; display: block; }

a { color: inherit; text-decoration: underline; text-decoration-color: var(--line); text-underline-offset: 0.2em; text-decoration-thickness: 1px; transition: text-decoration-color .2s, color .2s; }
a:hover { text-decoration-color: var(--ink); }

::selection { background: var(--accent); color: var(--bg); }

/* ---------- Layout ---------- */

.wrap { max-width: var(--wide); margin: 0 auto; padding: 0 1.5rem; }
.measure { max-width: var(--measure); }

main { padding: 4.5rem 0 6rem; }

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

.site-header {
  position: sticky; top: 0; z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid transparent;
}
.site-header .wrap {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 1.5rem; padding-top: 1.4rem; padding-bottom: 1.4rem; flex-wrap: wrap;
}
.site-name {
  font-family: var(--display); font-weight: 700; font-size: 1rem; line-height: 1;
  letter-spacing: -0.01em; text-decoration: none;
}
/* the RZ mark next to the name: still until you hover, then it plays once.
   Its white background is multiplied away so only the colours show on the beige. */
.site-name { display: inline-flex; align-items: center; gap: 0.5rem; }
.site-header .wrap { align-items: center; }
.site-mark { width: 1.75rem; height: 1.75rem; display: block; flex: none; mix-blend-mode: multiply; pointer-events: none; }
.site-nav { display: flex; gap: 1.75rem; flex-wrap: wrap; position: relative; }
.site-nav a {
  font-size: 0.9375rem; color: var(--ink-2); text-decoration: none;
  padding-bottom: 2px; border-bottom: 1px solid transparent;
}
.site-nav a:hover { color: var(--ink); }
.site-nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--ink); }
/* when site.js is running, one sliding indicator replaces the per-link underline */
.js-nav .site-nav a[aria-current="page"] { border-bottom-color: transparent; }
.nav-indicator {
  position: absolute; left: 0; top: 0; height: 1px; background: var(--ink); pointer-events: none;
  transform-origin: 0 0; will-change: transform, width;
}
.nav-indicator.animate { transition: transform .32s cubic-bezier(.2,.7,.2,1), width .32s cubic-bezier(.2,.7,.2,1); }
/* the bar is draggable like a slider */
.js-nav .site-header { cursor: grab; touch-action: pan-y; }
.js-nav .site-header.dragging { cursor: grabbing; user-select: none; -webkit-user-select: none; }
.js-nav .site-header.dragging a { cursor: grabbing; }

@media (max-width: 560px) {
  .site-header .wrap { padding-top: 1rem; padding-bottom: 0.9rem; gap: 0.6rem; }
  .site-nav { gap: 0.5rem; flex-wrap: nowrap; width: 100%; justify-content: space-between; }   /* one line, so the bar drags like a slider */
  .site-nav a { font-size: 0.875rem; white-space: nowrap; }
}
@media (max-width: 380px) {
  .site-nav { gap: 0.35rem; }
  .site-nav a { font-size: 0.78rem; }
}

/* ---------- Type ---------- */

h1, h2, h3 { font-weight: 400; margin: 0; }

.display {
  font-family: var(--display); font-weight: 400;
  font-size: clamp(2.5rem, 5.5vw, 3.75rem);
  line-height: 1.04; letter-spacing: -0.03em;
  margin-bottom: 1.75rem;
}
.display em { font-style: normal; color: var(--ink-3); }

.lede { font-size: 1.1875rem; line-height: 1.55; letter-spacing: -0.01em; color: var(--ink); max-width: var(--measure); }

p { margin: 0 0 1.1rem; color: var(--ink-2); max-width: var(--measure); }
p strong { color: var(--ink); font-weight: 700; }

.eyebrow {
  font-size: 0.8125rem; color: var(--ink-3); font-weight: 400; margin: 0 0 1.25rem;
}

.page-title {
  font-family: var(--display); font-weight: 400; font-size: clamp(2rem, 4vw, 2.75rem);
  line-height: 1.1; letter-spacing: -0.025em; margin-bottom: 0.75rem;
}
.page-intro { color: var(--ink-2); max-width: var(--measure); margin-bottom: 4rem; }

/* ---------- Sections ---------- */

.section { padding-top: 4.5rem; margin-top: 4.5rem; border-top: 1px solid var(--line); }
.section:first-of-type { border-top: 0; margin-top: 0; padding-top: 0; }

.section-grid { display: grid; grid-template-columns: 12rem minmax(0, 1fr); gap: 2rem; }
.section-grid > .eyebrow { margin: 0.35rem 0 0; }

@media (max-width: 720px) {
  .section-grid { grid-template-columns: 1fr; gap: 1rem; }
}

/* ---------- Entry list (research, projects, tracks) ---------- */

.entries { list-style: none; margin: 0; padding: 0; }
.entry { padding: 2rem 0; border-top: 1px solid var(--line); }
.entry:first-child { border-top: 0; padding-top: 0; }
.entry-head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; flex-wrap: wrap; margin-bottom: 0.35rem; }
.entry-title { font-size: 1.0625rem; font-weight: 700; color: var(--ink); letter-spacing: -0.01em; }
.entry-meta { font-size: 0.875rem; color: var(--ink-3); font-variant-numeric: tabular-nums; white-space: nowrap; }
.entry-sub { font-size: 0.875rem; color: var(--ink-3); margin-bottom: 0.4rem; }
.entry p { font-size: 1rem; }
.entry-advisors { font-size: 0.875rem; color: var(--ink-3); margin: -0.2rem 0 0.6rem; }
.entry-sub a, .entry-advisors a { color: inherit; }
.entry-link { font-size: 0.9375rem; color: var(--ink); }
.entry-link::after { content: " \2192"; }

.tags { display: flex; flex-wrap: wrap; margin: 0 0 0.9rem; padding: 0; list-style: none; }
.tags li { font-size: 0.875rem; color: var(--ink-3); }
.tags li + li::before { content: '·'; margin: 0 0.5em; }

/* ---------- Media ---------- */

.media { margin: 1.25rem 0 1.25rem; background: var(--surface); }
.media img { width: 100%; height: auto; }
.ratio { position: relative; width: 100%; aspect-ratio: 16 / 9; background: var(--surface); }
.ratio.portrait { aspect-ratio: 9 / 16; }
.ratio iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

.media-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); gap: 1.5rem; }
.media-row.shorts { grid-template-columns: repeat(auto-fit, minmax(14rem, 20rem)); }
.caption { font-size: 0.875rem; color: var(--ink-3); margin-top: 0.6rem; }

audio { width: 100%; height: 40px; margin: 0.25rem 0 0.75rem; }

/* ---------- Simple list (affiliations, links) ---------- */

.plain-list { list-style: none; padding: 0; margin: 0; }
.plain-list li { display: flex; justify-content: space-between; gap: 1rem; padding: 0.7rem 0; border-top: 1px solid var(--line); color: var(--ink-2); }
.plain-list li:last-child { border-bottom: 1px solid var(--line); }
.plain-list .k { color: var(--ink); }
.plain-list .v { color: var(--ink-3); font-size: 0.9375rem; text-align: right; white-space: nowrap; }

@media (max-width: 560px) {
  .plain-list li { flex-direction: column; gap: 0.1rem; }
  .plain-list .v { text-align: left; white-space: normal; }
}

.link-row { display: flex; gap: 1.75rem; flex-wrap: wrap; margin-top: 2rem; }

/* ---------- News (home) ---------- */

.news { list-style: none; margin: 0; padding: 0; }
.news li { display: grid; grid-template-columns: 7rem 1fr; gap: 1rem; padding: 0.7rem 0; border-top: 1px solid var(--line); color: var(--ink-2); }
.news li:last-child { border-bottom: 1px solid var(--line); }
.news time { color: var(--ink-3); font-size: 0.875rem; font-variant-numeric: tabular-nums; padding-top: 0.1rem; }
@media (max-width: 560px) { .news li { grid-template-columns: 1fr; gap: 0.15rem; } }

/* ---------- In-page nav (music) ---------- */

.subnav { display: flex; gap: 1.5rem; flex-wrap: wrap; margin: -2rem 0 4rem; font-size: 0.9375rem; }
.subnav a { color: var(--ink-2); text-decoration: none; }
.subnav a:hover { color: var(--ink); }

/* ---------- Button ---------- */

.btn {
  display: inline-block; font-size: 0.9375rem; text-decoration: none;
  color: var(--ink); border: 1px solid var(--ink); padding: 0.6rem 1.2rem;
  transition: background .2s, color .2s;
}
.btn:hover { background: var(--ink); color: var(--bg); }

/* ---------- SFX grid ---------- */

.sfx-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(10rem, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.sfx {
  appearance: none; border: 0; background: var(--bg); color: var(--ink);
  font: inherit; text-align: left; padding: 1.25rem; cursor: pointer;
  display: flex; flex-direction: column; gap: 2.5rem; min-height: 9rem;
  position: relative; overflow: hidden; transition: background .2s;
}
.sfx:hover { background: var(--surface); }
.sfx .state { font-size: 0.75rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-3); }
.sfx .name { font-size: 1rem; line-height: 1.35; }
.sfx .bar { position: absolute; left: 0; bottom: 0; height: 2px; width: 0; background: var(--accent); }
.sfx.playing .state { color: var(--accent); }

/* ---------- CV embed ---------- */

.pdf { width: 100%; height: 80vh; border: 1px solid var(--line); background: #fff; }

/* ---------- Writing list ---------- */

.notes .note-link { display: block; text-decoration: none; margin: -1rem; padding: 1rem; transition: background .2s; }
.notes .note-link:hover { background: var(--surface); }
.notes .note-link:hover .entry-title { text-decoration: underline; text-underline-offset: 0.2em; text-decoration-thickness: 1px; }
.notes .entry-sub { display: block; margin: 0; font-size: 0.875rem; }

/* ---------- Long-form note pages (writing/side pages) ---------- */

.note { max-width: var(--measure); }
.note h1 { font-family: var(--display); font-weight: 400; font-size: clamp(2rem, 4vw, 2.75rem); line-height: 1.1; letter-spacing: -0.025em; margin-bottom: 0.75rem; }
.note .byline { font-size: 0.875rem; color: var(--ink-3); margin-bottom: 3rem; }
.note h2 { font-family: var(--display); font-weight: 700; font-size: 1.375rem; line-height: 1.25; letter-spacing: -0.02em; margin: 3rem 0 1rem; }
.note h3 { font-size: 1.0625rem; font-weight: 700; margin: 2rem 0 0.5rem; }
.note p, .note li { color: var(--ink); }
.note ul, .note ol { padding-left: 1.25rem; margin: 0 0 1.1rem; }
.note li { margin-bottom: 0.4rem; }
.note blockquote { margin: 2rem 0; padding-left: 1.25rem; border-left: 2px solid var(--line); font-size: 1.1875rem; line-height: 1.5; color: var(--ink-2); }
.note code { font-family: var(--mono); font-size: 0.875em; background: var(--surface); padding: 0.1em 0.35em; }
.note pre { background: var(--surface); padding: 1rem 1.25rem; overflow-x: auto; font-size: 0.875rem; line-height: 1.5; }
.note pre code { background: none; padding: 0; }
.note figure { margin: 2rem 0; }
.note figcaption { font-size: 0.875rem; color: var(--ink-3); margin-top: 0.6rem; }
.note .back { font-size: 0.9375rem; color: var(--ink-2); text-decoration: none; display: inline-block; margin-bottom: 2.5rem; }
.note .back:hover { color: var(--ink); }

/* ---------- Home layout: photo, links, news | name, intro, sections ---------- */

.home { display: grid; grid-template-columns: 15rem minmax(0, 1fr); gap: 4.5rem; align-items: start; }
.portrait { margin: 0; }
.portrait img { width: 100%; height: auto; aspect-ratio: 4 / 5; object-fit: cover; background: var(--surface); }
.home-news { margin-top: 2.75rem; }
.home-news .eyebrow { margin-bottom: 0.75rem; }
.home-news .news li { grid-template-columns: 1fr; gap: 0.1rem; font-size: 0.9375rem; line-height: 1.45; padding: 0.75rem 0; }
.home-news .news time { font-size: 0.8125rem; padding: 0; }
.home-intro .display { margin-bottom: 1.25rem; }
.home-main .section { margin-top: 3.5rem; padding-top: 3.5rem; }
.home .section-grid { grid-template-columns: 7.5rem minmax(0, 1fr); }

/* icon links */
.contact { display: flex; flex-wrap: wrap; gap: 0.25rem; margin: 1rem 0 0 -0.5rem; padding: 0; list-style: none; }
.contact-icon {
  position: relative; display: grid; place-items: center; width: 2.4rem; height: 2.4rem; border-radius: 50%;
  color: var(--ink-2); background: none; border: 0; padding: 0; cursor: pointer; text-decoration: none; font: inherit;
  transition: color .15s, background .15s;
}
.contact-icon:hover, .contact-icon:focus-visible { color: var(--ink); background: var(--surface); }
.contact-icon:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.contact-icon .icon { width: 1.125rem; height: 1.125rem; }
/* label under each icon on hover; the email "Copied" bubble uses the same spot */
.contact-icon::after, .contact-icon .bubble {
  position: absolute; top: calc(100% + 6px); left: 50%; transform: translateX(-50%); z-index: 20;
  white-space: nowrap; pointer-events: none; font-family: var(--sans); font-weight: 400; letter-spacing: 0.005em; font-size: 0.75rem; line-height: 1; padding: 0.4rem 0.55rem;
  background: var(--ink); color: var(--bg); opacity: 0; transition: opacity .15s;
}
.contact-icon::after { content: attr(data-tip); }
.contact-icon:hover::after, .contact-icon:focus-visible::after { opacity: 1; }
.contact li:first-child .contact-icon::after, .contact-icon .bubble { left: 0; transform: none; }
.contact-icon .bubble::before { /* little pointer */
  content: ''; position: absolute; bottom: 100%; left: 0.95rem; border: 5px solid transparent; border-bottom-color: var(--ink);
}
.contact-icon.copied::after { opacity: 0; }
.contact-icon.copied .bubble { opacity: 1; }

@media (max-width: 760px) {
  .home { display: flex; flex-direction: column; gap: 0; }
  .home-side, .home-main { display: contents; }
  .portrait { order: 1; max-width: 11rem; margin-bottom: 1.75rem; }
  .home-intro { order: 2; }
  .contact { order: 3; margin-top: 1.25rem; }
  .home-news { order: 4; margin-top: 3rem; }
  .home-main > .section { order: 5; width: 100%; }
  .home-intro, .home-news { width: 100%; }
  .home .section-grid { grid-template-columns: 1fr; }
}

/* smaller inline images (e.g. Hand Music photo) */
.media.small { max-width: 26rem; }

/* ---------- Page slide transitions (see site.js) ---------- */

@view-transition { navigation: auto; }
.site-header { view-transition-name: site-header; }
::view-transition-group(site-header) { animation: none; }
@keyframes slide-out-left  { to   { transform: translateX(-30%); opacity: 0; } }
@keyframes slide-in-right  { from { transform: translateX(30%);  opacity: 0; } }
@keyframes slide-out-right { to   { transform: translateX(30%);  opacity: 0; } }
@keyframes slide-in-left   { from { transform: translateX(-30%); opacity: 0; } }
html[data-slide="next"]::view-transition-old(root) { animation: slide-out-left .32s cubic-bezier(.4,0,.2,1) both; }
html[data-slide="next"]::view-transition-new(root) { animation: slide-in-right .32s cubic-bezier(.2,.7,.2,1) both; }
html[data-slide="prev"]::view-transition-old(root) { animation: slide-out-right .32s cubic-bezier(.4,0,.2,1) both; }
html[data-slide="prev"]::view-transition-new(root) { animation: slide-in-left .32s cubic-bezier(.2,.7,.2,1) both; }
@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root), ::view-transition-new(root) { animation: none !important; }
}

/* ---------- Footer ---------- */

.site-footer { border-top: 1px solid var(--line); padding: 2rem 0 3rem; font-size: 0.8125rem; color: var(--ink-3); }
.site-footer p { color: var(--ink-3); font-size: 0.8125rem; max-width: none; margin: 0 0 0.4rem; }
.site-footer .wrap { display: flex; justify-content: space-between; align-items: center; gap: 0.75rem 2rem; flex-wrap: wrap; }
.site-footer .wrap > p { flex: 1 1 20rem; margin: 0; }
.footer-contact { margin: 0 -0.5rem 0 auto; gap: 0.1rem; }
.footer-contact .contact-icon { width: 2.1rem; height: 2.1rem; }
.footer-contact .contact-icon .icon { width: 1rem; height: 1rem; }
/* at the bottom of the page, labels pop up above the icons and hug the right edge */
.footer-contact .contact-icon::after, .footer-contact .contact-icon .bubble { top: auto; bottom: calc(100% + 6px); }
.footer-contact li:last-child .contact-icon::after { left: auto; right: 0; transform: none; }
.footer-contact li:first-child .contact-icon::after { left: 50%; transform: translateX(-50%); }
.footer-contact .contact-icon .bubble { left: auto; right: -4.5rem; }
.footer-contact .contact-icon .bubble::before { bottom: auto; top: 100%; left: auto; right: 5.45rem; border-bottom-color: transparent; border-top-color: var(--ink); }

/* ---------- Slideshow (site.js) ---------- */
/* all pages sit side by side in one snapping strip; each slide scrolls vertically */
html.deck-on, html.deck-on body { height: 100%; overflow: hidden; overscroll-behavior: none; }
html.deck-on body { display: flex; flex-direction: column; height: 100dvh; }
html.deck-on .site-header { position: relative; flex: none; }
.deck {
  flex: 1 1 auto; min-height: 0; display: flex;
  overflow-x: auto; overflow-y: hidden; scroll-snap-type: x mandatory;
  overscroll-behavior-x: none; scrollbar-width: none; -webkit-overflow-scrolling: touch;
}
.deck::-webkit-scrollbar { display: none; }
.deck.free { scroll-snap-type: none; }
.slide {
  flex: 0 0 100%; width: 100%; height: 100%; min-width: 0;
  overflow-x: hidden; overflow-y: auto; overscroll-behavior-y: contain;
  scroll-snap-align: start; scroll-snap-stop: always; outline: none;
}
/* the music player sticks to the top of its slide, not under the header */
html.deck-on .player { top: 1.5rem; }
@media (max-width: 900px) { html.deck-on .player { top: 0; } }
html[data-slide="none"]::view-transition-old(root),
html[data-slide="none"]::view-transition-new(root) { animation: none; }