/* ============================================================
   PEIYANG LI — site styles
   Palette: muted teal/sage on warm white, refined editorial feel
   ============================================================ */

:root{
  --bg: #FBFAF7;
  --ink: #2A3B3A;
  --ink-soft: #5C6F6E;
  --muted: #8C9C9B;
  --sage: #DCE6E5;
  --sage-2: #C9D6D4;
  --sage-3: #ABBFBC;
  --line: #E4EBEA;
  --accent: #5B7B7A;
  --pill-bg: #DCE6E5;
  --pill-ink: #2A3B3A;
  --paper: #F1ECE3;
  --shadow: 0 1px 0 rgba(42,59,58,0.04);

  --font-sans: "Instrument Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-display: "Instrument Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
  /* tabular numerics still use sans — kept var name for backwards compat */
  --font-mono: "Instrument Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-serif: "Instrument Serif", "Cormorant Garamond", Georgia, serif;

  --pad-x: clamp(20px, 3.2vw, 56px);
  --nav-h: 92px;
}

*{ box-sizing: border-box; }
html, body{ margin:0; padding:0; }
html{ -webkit-text-size-adjust: 100%; }
body{
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.55;
  font-feature-settings: "ss01", "ss02";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img{ display:block; max-width:100%; }
a{ color: inherit; text-decoration: none; }
button{ font: inherit; color: inherit; background: none; border:0; cursor: pointer; padding: 0; }

/* ----- nav ----- */
.nav{
  position: sticky; top: 0; z-index: 50;
  display: grid; grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: clamp(12px, 2vw, 32px);
  padding: clamp(14px, 1.6vw, 24px) var(--pad-x) clamp(12px, 1.4vw, 20px);
  background: color-mix(in oklab, var(--bg) 92%, transparent);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s ease, background .3s ease;
}
.nav.scrolled{ border-bottom-color: var(--line); }
.nav-left, .nav-right{ display:flex; align-items:center; gap: 10px; }
.nav-right{ justify-content: flex-end; }
.nav-pill{
  display:inline-flex; align-items:center; justify-content:center;
  height: clamp(34px, 3.6vw, 40px);
  padding: 0 clamp(12px, 1.2vw, 18px);
  background: var(--pill-bg);
  color: var(--pill-ink);
  border-radius: 20px;
  font-size: clamp(9.5px, 0.75vw, 11px);
  letter-spacing: 0.06em; font-weight: 500;
  text-transform: uppercase;
  transition: background .2s ease, transform .2s ease, color .2s ease;
  white-space: nowrap;
}
.nav-pill:hover{ background: var(--sage-2); }
.nav-pill[aria-current="page"]{ background: var(--ink); color: #fff; }
.nav-wordmark{
  display:flex; align-items:center; gap:14px;
  font-family: var(--font-display);
}
.nav-wordmark .mark{
  /* logo is shrink-wrapped; size by height to keep nav rhythm consistent */
  height: clamp(20px, 2.2vw, 30px);
  width: auto;
  filter: contrast(1.02);
  transition: filter .35s cubic-bezier(.2,.7,.2,1), transform .5s cubic-bezier(.2,.7,.2,1);
  transform-origin: center;
}
.nav-wordmark:hover .mark{
  transform: scale(1.04);
  filter: contrast(1.05);
}
.nav-wordmark:active .mark{ transform: scale(0.98); transition: transform .12s ease; }
@media (prefers-reduced-motion: reduce){
  .nav-wordmark:hover .mark{ animation: none; }
}
.nav-wordmark .mark-text{
  font-weight: 500;
  font-size: 16px;
  letter-spacing: 0.42em;
  text-transform: uppercase;
}

/* ----- footer ----- */
.foot{
  display:flex; justify-content: space-between; align-items: center;
  padding: 18px var(--pad-x);
  font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--muted);
}

/* ----- common ----- */
.eyebrow{
  font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--muted); font-weight: 500;
}
.h-display{
  font-family: var(--font-display);
  font-weight: 300; letter-spacing: -0.02em; line-height: 1.02;
  font-size: clamp(40px, 6.4vw, 96px);
  margin: 0;
}
.h-serif{
  font-family: var(--font-serif);
  font-weight: 400; font-style: italic;
  letter-spacing: -0.01em; line-height: 1.05;
}
.rule{ height:1px; background: var(--line); border:0; margin: 0; }
.container{ padding: 0 var(--pad-x); }

/* ----- toolbar/pills used in body ----- */
.chip{
  display:inline-flex; align-items:center; gap:8px;
  height: 28px; padding: 0 11px;
  border:1px solid var(--line); border-radius: 999px;
  font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-soft);
  background: var(--bg);
}
.tabular{ font-variant-numeric: tabular-nums; letter-spacing: 0.08em; }
.chip.active{ background: var(--ink); color: #fff; border-color: var(--ink); }

/* ----- page transition ----- */
.fade-in{ animation: fadeIn .7s cubic-bezier(.2,.7,.2,1) both; }
@keyframes fadeIn{ from{opacity:0; transform: translateY(8px)} to{opacity:1; transform:none} }

.reveal{
  opacity: 0;
  transform: translateY(22px);
  filter: blur(6px);
  transition:
    opacity 1s cubic-bezier(.2,.65,.2,1),
    transform 1.1s cubic-bezier(.2,.65,.2,1),
    filter .9s ease;
  transition-delay: var(--reveal-delay, 0s);
  will-change: opacity, transform, filter;
}
.reveal.in{ opacity: 1; transform: none; filter: blur(0); }
@media (prefers-reduced-motion: reduce){
  .reveal{ opacity: 1 !important; transform: none !important; filter: none !important; transition: none; }
  .fade-in{ animation: none; }
}

/* ----- selection ----- */
::selection{ background: var(--ink); color: var(--bg); text-shadow: none; }
::-moz-selection{ background: var(--ink); color: var(--bg); text-shadow: none; }
img::selection, figure::selection{ background: rgba(35,40,33,0.18); }

/* ----- hover polish ----- */
.nav-pill{ position: relative; }
.nav-pill:hover{ background: var(--sage); color: var(--ink); }
.nav-pill[aria-current="page"]:hover{ background: var(--ink); color: #fff; }

figure{ overflow: hidden; }
figure img{
  transition: transform 1.2s cubic-bezier(.2,.65,.2,1), filter .6s ease;
  will-change: transform;
}
figure:hover img{ transform: scale(1.04); }
body[data-screen-label="Works"] .project-grid figure img{ cursor: zoom-in; }

.event-thumb{ transition: transform .5s cubic-bezier(.2,.65,.2,1), filter .35s ease; }
.event:hover .event-thumb{ transform: scale(1.06); filter: saturate(1.05); }

/* ----- mobile menu trigger ----- */
.nav-toggle{
  display: none;
  width: 40px; height: 40px;
  border-radius: 999px;
  border: 1px solid var(--line);
  align-items: center; justify-content: center;
  background: var(--bg);
  cursor: pointer;
}
.nav-toggle .bars{
  display: block; width: 16px; height: 10px; position: relative;
}
.nav-toggle .bars::before,
.nav-toggle .bars::after,
.nav-toggle .bars span{
  content: ''; position: absolute; left: 0; right: 0; height: 1.5px; background: var(--ink);
  transition: transform .3s ease, opacity .2s ease, top .3s ease, bottom .3s ease;
}
.nav-toggle .bars::before{ top: 0; }
.nav-toggle .bars span{ top: 50%; transform: translateY(-50%); }
.nav-toggle .bars::after{ bottom: 0; }
body.menu-open .nav-toggle .bars::before{ top: 50%; transform: rotate(45deg); }
body.menu-open .nav-toggle .bars::after{ bottom: 50%; transform: rotate(-45deg); }
body.menu-open .nav-toggle .bars span{ opacity: 0; }

/* ----- mobile drawer ----- */
.mobile-menu{
  position: fixed; inset: 0;
  background: var(--bg);
  z-index: 60;
  display: flex; flex-direction: column;
  padding: clamp(80px, 14vh, 120px) var(--pad-x) 32px;
  pointer-events: none;
  opacity: 0;
  transition: opacity .35s ease;
}
body.menu-open .mobile-menu{ pointer-events: auto; opacity: 1; }
.mobile-menu .mm-list{
  list-style: none; padding: 0; margin: 0;
  display: grid; gap: 4px;
}
.mobile-menu .mm-list a{
  display: flex; align-items: baseline; justify-content: space-between;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-display); font-weight: 300;
  font-size: clamp(40px, 12vw, 64px); letter-spacing: -0.02em;
  line-height: 1;
  transform: translateY(20px); opacity: 0;
  transition: transform .5s cubic-bezier(.2,.65,.2,1), opacity .5s ease;
}
.mobile-menu .mm-list a .num{
  font-size: 11px; letter-spacing: 0.22em; text-transform: uppercase; color: var(--muted);
  font-weight: 500;
  font-family: var(--font-sans);
}
body.menu-open .mobile-menu .mm-list a{ transform: none; opacity: 1; }
body.menu-open .mobile-menu .mm-list a:nth-child(1){ transition-delay: .08s; }
body.menu-open .mobile-menu .mm-list a:nth-child(2){ transition-delay: .14s; }
body.menu-open .mobile-menu .mm-list a:nth-child(3){ transition-delay: .20s; }
body.menu-open .mobile-menu .mm-list a:nth-child(4){ transition-delay: .26s; }
.mobile-menu .mm-foot{
  margin-top: auto;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--muted);
  padding-top: 24px; border-top: 1px solid var(--line);
}
body.menu-open{ overflow: hidden; }

/* ===== STYLE VARIANTS — typography pairings tied to hero variant ===== */
/* Classic (default): Instrument Sans throughout, no serif. */
body[data-hero-variant="classic"]{
  --font-display: "Instrument Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-serif:   "Instrument Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-sans:    "Instrument Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --display-weight: 500;
  --display-tracking: -0.025em;
  --body-line: 1.55;
}
body[data-hero-variant="classic"]{ font-family: var(--font-sans); line-height: var(--body-line); }
body[data-hero-variant="classic"] .h-display,
body[data-hero-variant="classic"] .page-head h1,
body[data-hero-variant="classic"] .project-title,
body[data-hero-variant="classic"] .preview-head h2{
  font-weight: 500;
  letter-spacing: -0.025em;
  font-style: normal;
}
body[data-hero-variant="classic"] .h-serif,
body[data-hero-variant="classic"] .intro-strip .lead,
body[data-hero-variant="classic"] em{ font-style: normal; font-family: var(--font-sans); }

/* Refined: Instrument Sans body, Instrument Serif italic for prose + accents. Lighter display weight. */
body[data-hero-variant="refined"]{
  --font-display: "Instrument Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-serif:   "Instrument Serif", Georgia, serif;
  --font-sans:    "Instrument Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
}
body[data-hero-variant="refined"]{ font-family: var(--font-sans); }
body[data-hero-variant="refined"] .h-display,
body[data-hero-variant="refined"] .page-head h1,
body[data-hero-variant="refined"] .project-title,
body[data-hero-variant="refined"] .preview-head h2{
  font-weight: 300;
  letter-spacing: -0.03em;
}
body[data-hero-variant="refined"] .intro-strip .lead,
body[data-hero-variant="refined"] .project-body p:first-of-type{
  font-family: var(--font-serif); font-style: italic; font-weight: 400;
  letter-spacing: -0.005em;
}
body[data-hero-variant="refined"] .preview-grid a .label,
body[data-hero-variant="refined"] .hero-slide .label{ font-style: italic; font-family: var(--font-serif); text-transform: none; letter-spacing: 0; font-size: 13px; }

/* Editorial: Newsreader serif everywhere except chrome. Magazine plate. */
body[data-hero-variant="editorial"]{
  --font-display: "Newsreader", "Instrument Serif", Georgia, serif;
  --font-serif:   "Newsreader", Georgia, serif;
  --font-sans:    "Instrument Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
}
body[data-hero-variant="editorial"]{ font-family: var(--font-serif); line-height: 1.5; }
body[data-hero-variant="editorial"] .h-display,
body[data-hero-variant="editorial"] .page-head h1,
body[data-hero-variant="editorial"] .project-title,
body[data-hero-variant="editorial"] .preview-head h2{
  font-weight: 400; letter-spacing: -0.015em; font-style: italic;
}
body[data-hero-variant="editorial"] .intro-strip .lead{
  font-family: var(--font-serif); font-style: italic; font-weight: 400;
  font-size: clamp(26px, 2.6vw, 38px); line-height: 1.18; letter-spacing: -0.01em;
}
body[data-hero-variant="editorial"] .project-body p,
body[data-hero-variant="editorial"] .intro-strip dd{
  font-family: var(--font-serif); font-size: 17px; line-height: 1.55;
}
body[data-hero-variant="editorial"] .nav-pill,
body[data-hero-variant="editorial"] .eyebrow,
body[data-hero-variant="editorial"] .hero-slide .label,
body[data-hero-variant="editorial"] .preview-head .meta,
body[data-hero-variant="editorial"] .foot,
body[data-hero-variant="editorial"] .intro-strip dt{ font-family: var(--font-sans); }

/* Expressive: Bricolage Grotesque everywhere, weighty + bold + tight. Mono labels for contrast. */
body[data-hero-variant="expressive"]{
  --font-display: "Bricolage Grotesque", "Instrument Sans", Helvetica, Arial, sans-serif;
  --font-serif:   "Bricolage Grotesque", "Instrument Serif", Georgia, serif;
  --font-sans:    "Bricolage Grotesque", "Instrument Sans", Helvetica, Arial, sans-serif;
}
body[data-hero-variant="expressive"]{ font-family: var(--font-sans); letter-spacing: -0.005em; }
body[data-hero-variant="expressive"] .h-display,
body[data-hero-variant="expressive"] .page-head h1,
body[data-hero-variant="expressive"] .project-title,
body[data-hero-variant="expressive"] .preview-head h2{
  font-weight: 700; letter-spacing: -0.04em;
}
body[data-hero-variant="expressive"] .intro-strip .lead{
  font-family: var(--font-sans); font-weight: 600;
  font-size: clamp(24px, 2.5vw, 36px); line-height: 1.1; letter-spacing: -0.03em;
}
body[data-hero-variant="expressive"] .nav-pill,
body[data-hero-variant="expressive"] .eyebrow,
body[data-hero-variant="expressive"] .preview-head .meta,
body[data-hero-variant="expressive"] .foot,
body[data-hero-variant="expressive"] .intro-strip dt,
body[data-hero-variant="expressive"] .hero-slide .label,
body[data-hero-variant="expressive"] .hero-stamp{
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0; text-transform: none; font-weight: 500;
}
body[data-hero-variant="expressive"] .nav-pill{ text-transform: lowercase; }

/* ----- responsive nav ----- */
@media (max-width: 720px){
  .nav{ grid-template-columns: 1fr auto; row-gap: 0; padding-top: 14px; padding-bottom: 12px; }
  .nav-left{ display: none; }
  .nav-right > a{ display: none; }
  .nav-wordmark{ grid-column: 1; justify-self: start; }
  .nav-right{ grid-column: 2; justify-content: flex-end; }
  .nav-toggle{ display: inline-flex; }
  .nav .nav-toggle.right{ visibility: visible; }
  .nav-wordmark .mark{ height: 20px; }
}
@media (min-width: 721px){
  .mobile-menu{ display: none !important; }
  .nav-toggle{ display: none !important; }
}

/* ----- mobile fine tuning ----- */
@media (max-width: 720px){
  /* tighter section gaps */
  .intro-strip{ padding: 40px var(--pad-x) 32px; gap: 22px; }
  .intro-strip .lead{ font-size: 19px; line-height: 1.35; }
  .intro-strip dl{ gap: 10px; font-size: 12.5px; }
  .preview{ padding: 40px var(--pad-x) 16px; }
  .preview-head{ margin-bottom: 22px; }
  .preview-head h2{ font-size: clamp(26px, 7vw, 36px); }
  .preview-cta{ padding: 32px 0 48px; }
  .ticker{ padding: 14px 0; }
  /* softer scroll reveal — heavy blur+translate feels jittery on small screens */
  .reveal{ transform: translateY(12px); filter: none; }
  /* quicker, less drifty hero crossfade on mobile */
  .hero-slide{ transition: opacity .6s ease; }
}

/* ----- inline lightbox ----- */
.lightbox{ 
  position: fixed; inset: 0; z-index: 100;
  background: rgba(20,32,32,0.72);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  display: flex; align-items: center; justify-content: center;
  padding: clamp(20px, 4vw, 56px);
  opacity: 0; pointer-events: none;
  transition: opacity .25s ease;
  cursor: zoom-out;
}
.lightbox[hidden]{ display: none; }
.lightbox.open{ opacity: 1; pointer-events: auto; }
.lightbox-viewport{
  width: min(100%, 1200px); height: 100%; min-height: 0;
  padding: 0; overflow: hidden; touch-action: pan-y; cursor: grab;
}
.lightbox-viewport:active{ cursor: grabbing; }
.lightbox-track{
  display: flex; width: 100%; height: 100%;
  will-change: transform;
  transition: transform .35s cubic-bezier(.2,.7,.2,1);
}
.lightbox-slide{
  flex: 0 0 100%; width: 100%; height: 100%; min-width: 0;
  display: flex; align-items: center; justify-content: center; padding: 8px;
}
.lightbox-img{
  max-width: 100%; max-height: 100%;
  width: auto; height: auto;
  display: block; user-select: none;
  border-radius: 4px;
  box-shadow: none;
  transform: scale(.96);
  transition: transform .35s cubic-bezier(.2,.7,.2,1);
  cursor: default;
}
.lightbox.open .lightbox-img{ transform: scale(1); }
.lightbox-nav{
  position: absolute; top: 50%; z-index: 1;
  width: 40px; height: 40px; margin-top: -20px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 0; border-radius: 999px;
  background: rgba(255,255,255,.1); color: #fff;
  font: 400 24px/1 var(--font-sans); cursor: pointer;
  transition: background .2s ease, transform .2s ease;
}
.lightbox-nav:hover{ background: rgba(255,255,255,.22); transform: scale(1.04); }
.lightbox-nav[hidden]{ display: none; }
.lightbox-prev{ left: clamp(16px, 3vw, 48px); }
.lightbox-next{ right: clamp(16px, 3vw, 48px); }
.lightbox-count{
  position: absolute; left: 50%; bottom: clamp(16px, 3vw, 34px);
  transform: translateX(-50%); display: inline-flex; align-items: baseline; gap: 8px;
  max-width: calc(100% - 120px); color: rgba(255,255,255,.82);
  font: 500 11px/1 var(--font-mono); letter-spacing: .14em;
}
.lightbox-count-label{ max-width: min(68vw, 720px); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: rgba(255,255,255,.82); letter-spacing: .08em; }
.lightbox-count-number{ color: rgba(255,255,255,.56); letter-spacing: .08em; white-space: nowrap; }
.lightbox-close{
  position: absolute; top: clamp(14px, 2vw, 22px); right: clamp(14px, 2vw, 22px); z-index: 2;
  width: 40px; height: 40px;
  border-radius: 999px;
  background: rgba(255,255,255,.1);
  color: #fff;
  font: 400 24px/1 var(--font-sans);
  display: grid; place-items: center;
  cursor: pointer;
  transition: background .2s ease;
}
.lightbox-close:hover{ background: rgba(255,255,255,.22); }
body.lightbox-open{ overflow: hidden; }
@media (prefers-reduced-motion: reduce){
  .lightbox, .lightbox-img, .lightbox-nav{ transition: none; }
}