/* ==========================================================================
   Yixuan Jiang — portfolio
   Pure white. Home is a stack of full-screen panels (hero, covers, closing)
   that slide over each other; project pages slide up over the previous page.
   ========================================================================== */

:root {
  --bg: #fff;
  --fg: #000;
  --grey: #808080;
  --hair: rgba(0, 0, 0, .12);
  --pad: 40px;
  --font: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(.77, 0, .175, 1);
  --ease-out: cubic-bezier(.16, 1, .3, 1);
}
@media (max-width: 809px) { :root { --pad: 20px; } }

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

html { background: var(--bg); -webkit-text-size-adjust: 100%; }
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }
.lenis.lenis-smooth [data-lenis-prevent] { overscroll-behavior: contain; }
/* note: no overflow:hidden on .lenis-stopped — input is paused during transitions without hiding the scrollbar */

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-optical-sizing: auto;
  font-size: 15px;
  line-height: 1.5;
  letter-spacing: -.02em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
h1, p, dl, dd, figure { margin: 0; }
::selection { background: var(--fg); color: var(--bg); }
:focus-visible { outline: 1px solid currentColor; outline-offset: 4px; }

/* --------------------------------------------------------------------------
   Page transition — the new page slides up over the old one, which drifts up
   and fades (1.2s, cubic-bezier(.77,0,.175,1))
   -------------------------------------------------------------------------- */
::view-transition-old(root),
::view-transition-new(root) { mix-blend-mode: normal; backface-visibility: hidden; }
::view-transition-old(root) { animation: vt-exit 1.2s cubic-bezier(.77, 0, .175, 1) both; }
::view-transition-new(root) { animation: vt-enter 1.2s cubic-bezier(.77, 0, .175, 1) both; }
@keyframes vt-exit { from { opacity: 1; transform: translateY(0); } to { opacity: 0; transform: translateY(-25%); } }
@keyframes vt-enter { from { transform: translateY(100%); } to { transform: translateY(0); } }

/* fallback for browsers without View Transitions */
#app { transition: opacity .45s var(--ease-out); }
#app.is-leaving { opacity: 0; }

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 40;
  display: flex;
  align-items: center;
  padding: 18px var(--pad);
  color: #fff;
  mix-blend-mode: difference;
  pointer-events: none;
}
.brand { pointer-events: auto; font-weight: 500; font-size: 15px; letter-spacing: -.02em; }

/* --------------------------------------------------------------------------
   Home — stacked full-screen panels
   -------------------------------------------------------------------------- */
.panel {
  position: sticky;
  top: 0;
  display: block;
  height: 100vh;
  height: 100svh;
  overflow: hidden;
  background: var(--bg);
}
.panel__inner { position: absolute; inset: 0; overflow: hidden; will-change: transform, opacity; }

.contours {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 2.4s var(--ease-out) .2s;
  pointer-events: none;
}
.is-ready .contours { opacity: 1; }

/* covers */
.cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: var(--pos, 50% 50%);
  transition: transform 1.8s var(--ease-out);
}
.cover:hover img { transform: scale(1.025); }
@media (max-aspect-ratio: 1 / 1) { .cover img { object-position: var(--pos-m, var(--pos, 50% 50%)); } }

/* touch screens have no hover label, so name the project on the cover */
.cover__cap { display: none; }
@media (hover: none) {
  .cover__cap {
    position: absolute;
    left: var(--pad);
    right: var(--pad);
    bottom: 22px;
    display: block;
    color: #fff;
    mix-blend-mode: difference;
    font-size: 15px;
  }
}

/* hero — the portfolio cover page (000封皮) as a web page */
.hero { --rose: #9a5a52; --soft: rgba(0, 0, 0, .1); }
.hero__grid {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  grid-template-rows: auto minmax(0, 1fr) auto;
  column-gap: var(--pad);
  padding: clamp(62px, 8.5vh, 84px) var(--pad) 0;
}
.hero__rule {
  grid-column: 1 / -1;
  height: 1px;
  background: var(--rose);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 1.6s var(--ease) .05s;
}
.hero.is-in .hero__rule { transform: none; }

.hero__left {
  grid-column: 1 / span 5;
  grid-row: 2;
  display: flex;
  flex-direction: column;
  min-height: 0;
  padding: clamp(14px, 2.4vh, 26px) 0 clamp(16px, 3vh, 30px);
}
.hero__right {
  grid-column: 6 / -1;
  grid-row: 2;
  display: flex;
  flex-direction: column;
  min-height: 0;
  padding: clamp(10px, 1.6vh, 16px) 0 clamp(16px, 3vh, 30px);
}

.hero__label {
  color: var(--rose);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.hero__label--ink { color: var(--fg); }
.hero__title {
  margin-top: clamp(18px, 4vh, 46px);
  font-size: clamp(36px, min(4.4vw, 7.4vh), 70px);
  font-weight: 500;
  line-height: 1.04;
  letter-spacing: -.035em;
}
.hero__name {
  margin-top: clamp(18px, 4.6vh, 50px);
  font-size: clamp(16px, 1.45vw, 21px);
  font-weight: 500;
  letter-spacing: .01em;
  text-transform: uppercase;
}
.hero__focus { margin-top: clamp(6px, 1.2vh, 12px); font-size: 14px; color: #333; }
.hero__meta { margin-top: clamp(12px, 2.6vh, 28px); font-size: 13px; line-height: 1.6; color: #333; }
.hero__meta div { display: flex; gap: .6em; }
.hero__meta dt { color: var(--grey); }
.hero__meta a { transition: color .3s; }
.hero__meta a:hover { color: var(--rose); }

.hero__contents { margin-top: auto; padding-top: clamp(14px, 2.6vh, 28px); }
.hero__contents ol { list-style: none; margin: 10px 0 0; padding: 0; border-bottom: 1px solid var(--soft); }
.hero__contents a {
  display: grid;
  grid-template-columns: 3.4em minmax(0, 1fr) auto;
  align-items: baseline;
  padding: clamp(8px, 1.5vh, 13px) 0;
  border-top: 1px solid var(--soft);
  font-size: clamp(14px, 1.15vw, 17px);
}
.hc-no { color: var(--tone); font-weight: 500; }
.hc-t { transition: transform .6s var(--ease-out); }
.hc-n { color: var(--grey); font-size: 12px; }
.hero__contents a:hover .hc-t { transform: translateX(8px); }

.hero__map {
  position: relative;
  flex: 0 1 auto;
  min-height: 0;
  overflow: hidden;
  background: #1c2129;
  clip-path: inset(0 100% 0 0);
  transition: clip-path 1.6s var(--ease) .2s;
}
.hero.is-in .hero__map { clip-path: inset(0 0 0 0); }
.hero__map img {
  width: 100%;
  height: 100%;
  max-height: 56svh;
  object-fit: cover;
  transform: scale(1.08);
  transition: transform 2.6s var(--ease-out) .2s;
}
.hero.is-in .hero__map img { transform: none; }

.hero__tiles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(10px, 1.2vw, 18px);
  width: 72%;
  margin: clamp(10px, 1.8vh, 18px) 0 0 auto;
}
.hero__tile img { width: 100%; height: auto; max-height: 20svh; object-fit: contain; object-position: 50% 100%; }
.hero__tile figcaption {
  margin-top: 6px;
  color: var(--rose);
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 12px;
  letter-spacing: .14em;
}

.hero__foot {
  grid-column: 1 / -1;
  grid-row: 3;
  display: flex;
  justify-content: space-between;
  padding: 13px 0 15px;
  border-top: 1px solid var(--soft);
  color: var(--grey);
  font-size: 11px;
  letter-spacing: .06em;
  text-transform: uppercase;
}

/* staged entrance */
.hx { opacity: 0; transform: translate3d(0, 18px, 0); transition: opacity 1.1s var(--ease-out), transform 1.3s var(--ease-out); transition-delay: var(--d, 0s); }
.hero.is-in .hx { opacity: 1; transform: none; }

/* closing page */
.end .contours { -webkit-mask-image: linear-gradient(rgba(0, 0, 0, .35), #000 30% 55%, transparent 80%); mask-image: linear-gradient(rgba(0, 0, 0, .35), #000 30% 55%, transparent 80%); }
.end__content {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 0 var(--pad) clamp(16px, 3vh, 28px);
}
.end__row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  column-gap: var(--pad);
  padding-top: 16px;
  border-top: 1px solid var(--hair);
  margin-bottom: clamp(36px, 9vh, 96px);
  opacity: 0;
  transform: translate3d(0, 24px, 0);
  transition: opacity 1.2s var(--ease-out) .35s, transform 1.4s var(--ease-out) .35s;
}
.end.is-in .end__row { opacity: 1; transform: none; }
.end__label { color: var(--grey); margin-bottom: 6px; }
.end__link { display: block; }
.end__link span { display: inline-block; width: 2.2em; color: var(--grey); }
.end__row a { transition: color .3s; }
.end__row a:hover { color: var(--grey); }
.end__top { text-align: right; }
/* room below the baseline so the descender of the "g" is not clipped */
.end__markwrap { width: 100%; overflow: hidden; padding-bottom: calc(var(--fs, 200px) * .2); margin-bottom: calc(var(--fs, 200px) * -.05); }
.end__mark {
  font-size: 15vw;
  font-weight: 450;
  line-height: .8;
  letter-spacing: -.06em;
  white-space: nowrap;
  display: inline-block;
}
.end__mark span {
  display: inline-block;
  transform: translate3d(0, 135%, 0);
  transition: transform 1.3s var(--ease-out);
  transition-delay: var(--d, 0s);
}
.end.is-in .end__mark span { transform: none; }

/* --------------------------------------------------------------------------
   Project page
   -------------------------------------------------------------------------- */
.p-head {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: var(--pad);
  padding: 128px var(--pad) 72px;
}
.p-head > * { grid-column: 1; }
.p-head > .p-title { grid-column: 1 / -1; }
.p-title {
  font-size: clamp(44px, 5.6vw, 80px);
  font-weight: 450;
  line-height: 1;
  letter-spacing: -.04em;
  margin-bottom: 56px;
}
.p-desc { max-width: 640px; margin-bottom: 56px; text-wrap: pretty; }
.p-meta { display: grid; row-gap: 22px; }
.p-meta dt { color: var(--grey); }
.p-meta dd { margin-top: 4px; }

.p-hero { height: 100vh; height: 100svh; overflow: hidden; }
.p-hero img { width: 100%; height: 100%; object-fit: cover; object-position: var(--pos, 50% 50%); }
@media (max-aspect-ratio: 1 / 1) { .p-hero img { object-position: var(--pos-m, var(--pos, 50% 50%)); } }

.p-gallery { display: grid; row-gap: var(--pad); padding: var(--pad) var(--pad) 0; }
.p-img {
  width: 100%;
  border-radius: 2px;
  overflow: hidden;
  background: #f5f5f5;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, .06); /* keeps white boards from dissolving into the page */
}
.p-img img { width: 100%; height: auto; aspect-ratio: var(--r); }

.p-pn {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 20px;
  padding: 120px var(--pad) var(--pad);
}
.p-pn__item { display: block; }
.p-pn__item + .p-pn__item .p-pn__label { text-align: right; }
.p-pn__label { display: block; font-size: 20px; margin-bottom: 16px; }
.p-pn__thumb { aspect-ratio: 3 / 2; overflow: hidden; border-radius: 2px; background: #f5f5f5; }
.p-pn__thumb img { width: 100%; height: 100%; object-fit: cover; object-position: var(--pos, 50% 50%); transition: transform 1.6s var(--ease-out); }
.p-pn__item:hover .p-pn__thumb img { transform: scale(1.04); }

/* --------------------------------------------------------------------------
   Appear motion
   -------------------------------------------------------------------------- */
.ln { display: block; overflow: hidden; padding-bottom: .08em; margin-bottom: -.08em; }
.ln > span { display: block; transform: translate3d(0, 105%, 0); transition: transform 1.2s var(--ease-out); transition-delay: var(--d, 0s); }
.is-in .ln > span { transform: none; }

.ap { opacity: 0; transform: translate3d(0, 48px, 0); transition: opacity 1.2s var(--ease-out), transform 1.4s var(--ease-out); transition-delay: var(--d, 0s); }
.ap.is-in { opacity: 1; transform: none; }

img[data-fade] { opacity: 0; transition: opacity .8s var(--ease-out); }
img[data-fade].is-loaded { opacity: 1; }

/* --------------------------------------------------------------------------
   Cursor label on home covers (fine pointers only)
   -------------------------------------------------------------------------- */
.cursor { display: none; }
@media (hover: hover) and (pointer: fine) {
  [data-cursor] { cursor: none; }
  .cursor { display: block; position: fixed; left: 0; top: 0; z-index: 100; pointer-events: none; will-change: transform; }
  .cursor > span {
    position: absolute;
    left: 0;
    top: 0;
    white-space: nowrap;
    padding: 9px 15px 10px;
    border-radius: 999px;
    background: var(--fg);
    color: var(--bg);
    font-size: 14px;
    line-height: 1;
    opacity: 0;
    transform: translate(-50%, -50%) scale(.5);
    transition: opacity .3s var(--ease-out), transform .5s var(--ease-out);
  }
  .cursor.is-on > span { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

/* --------------------------------------------------------------------------
   Small screens
   -------------------------------------------------------------------------- */
@media (max-width: 809px) {
  /* hero becomes a normal scrolling page */
  .hero { position: relative; height: auto; min-height: 100svh; }
  .hero .panel__inner { position: relative; }
  .hero__grid { position: relative; display: flex; flex-direction: column; padding-top: 62px; }
  .hero__left, .hero__right { display: contents; }
  .hero__rule { order: 0; }
  .hero__label:not(.hero__label--ink) { order: 1; margin-top: 16px; }
  .hero__title { order: 2; font-size: 40px; margin-top: 18px; }
  .hero__map { order: 3; margin-top: 26px; }
  .hero__map img { max-height: none; }
  .hero__tiles { order: 4; width: 100%; }
  .hero__name { order: 5; margin-top: 30px; }
  .hero__focus { order: 6; }
  .hero__meta { order: 7; }
  .hero__meta div { flex-wrap: wrap; column-gap: .6em; }
  .hero__contents { order: 8; margin-top: 28px; padding-bottom: 32px; }
  .hero__foot { order: 9; }

  .end__row { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 22px; }
  .end__row > div:first-child { grid-column: 1 / -1; }
  .end__row > div:nth-child(3) { display: none; }

  .p-head { grid-template-columns: minmax(0, 1fr); padding-top: 104px; padding-bottom: 48px; }
  .p-title { margin-bottom: 36px; }
  .p-desc { margin-bottom: 36px; }
  .p-hero { height: 70svh; }
  .p-pn { padding-top: 80px; row-gap: 40px; }
  .p-pn__label { font-size: 17px; }
}

@media (prefers-reduced-motion: reduce) {
  ::view-transition-group(*), ::view-transition-old(*), ::view-transition-new(*) { animation: none !important; }
  .ln > span, .ap, .hx, .hero__rule, .hero__map, .hero__map img, .end__row, .end__mark span { transform: none !important; opacity: 1 !important; transition: none !important; }
  .hero__map { clip-path: none !important; }
}