:root {
  color-scheme: light;
  --paper: #ffffff;
  --surface: #f7f7f2;
  --ink: #171918;
  --muted: #686d69;
  --faint: #929791;
  --line: #c9cdc6;
  --line-strong: #8d938c;
  --accent: #b34632;
  --accent-soft: rgba(179, 70, 50, .09);
  --selection: #d9ddd5;
  --display: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --body: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "SFMono-Regular", Consolas, monospace;
  --fast: 150ms;
  --normal: 240ms;
  --page: 420ms;
  --opening: 700ms;
  --ease: cubic-bezier(.22, .75, .25, 1);
  --edge: clamp(20px, 3.4vw, 56px);
  --rail: clamp(210px, 19vw, 290px);
  --reading: 720px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #111716;
  --surface: #171d1b;
  --ink: #e7e7df;
  --muted: #a0a69f;
  --faint: #6f7771;
  --line: #353d39;
  --line-strong: #68716b;
  --accent: #dc745d;
  --accent-soft: rgba(220, 116, 93, .1);
  --selection: #28302d;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--normal), color var(--normal);
}
button, input { font: inherit; }
button { color: inherit; }
::selection { background: var(--selection); }
[hidden] { display: none !important; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.skip-link { position: fixed; left: 16px; top: 12px; z-index: 100; padding: 8px 12px; background: var(--ink); color: var(--paper); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 1px solid var(--accent); outline-offset: 4px; }

.text-button, .utility-link, .collection-link, .category-button, .site-name, .enter-link, .copy-button {
  appearance: none;
  border: 0;
  background: none;
  padding: 0;
  cursor: pointer;
}
.eyebrow, .folio, .rail-label, .shortcut, .section-index, .row-index, .row-meta, .detail-index, .detail-tags, .palette-index, .palette-context, .palette-foot, .site-foot, .copy-button, .copy-status, .file-name {
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: .08em;
}
.eyebrow { margin: 0; color: var(--muted); font-size: 10px; }

.entrance {
  min-height: 100svh;
  max-width: 1120px;
  margin-inline: auto;
  padding: 28px var(--edge) 24px;
  display: grid;
  grid-template-columns: minmax(220px, .75fr) minmax(0, 1.25fr);
  grid-template-rows: auto minmax(0, 1fr) auto;
  column-gap: clamp(28px, 5vw, 96px);
  row-gap: 0;
  overflow: auto;
}
.entrance.is-leaving { animation: entrance-recede var(--opening) var(--ease) both; pointer-events: none; }
.entrance-head {
  position: relative;
  grid-column: 1 / -1;
  grid-row: 1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 16px;
  border-bottom: 1px solid transparent;
}
.entrance-head::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: var(--ink);
  transform: scaleX(1);
  transform-origin: left;
}
.wordmark, .site-name { font-family: var(--display); font-size: 17px; font-weight: 500; }
.folio { font-size: 10px; color: var(--muted); }
.entrance-portrait {
  position: relative;
  grid-column: 1;
  grid-row: 2;
  align-self: center;
  justify-self: center;
  width: min(100%, 28vw, 320px);
  margin: 0;
}
.entrance-image-frame {
  --pointer-x: 50%;
  --pointer-y: 50%;
  --shift-x: 0px;
  --shift-y: 0px;
  --tilt-x: 0deg;
  --tilt-y: 0deg;
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 1;
  padding: 0;
  border: 0;
  overflow: hidden;
  background: transparent;
  perspective: 700px;
  cursor: pointer;
}
/* One shared layer keeps the face attached during press and release. */
.mascot-volume { position: relative; z-index: 1; display: block; width: 100%; height: 100%; perspective: 700px; transform-origin: 50% 94%; transition: scale 120ms ease-out; }
.entrance-image-frame::before { content: ""; position: absolute; left: 24%; right: 24%; bottom: 2%; height: 5%; border-radius: 50%; background: radial-gradient(ellipse, rgba(64, 24, 76, .2), transparent 70%); pointer-events: none;  transition: scale 180ms ease-out; }
.entrance-image-frame:active .mascot-volume { scale: 1.008 .982; animation: none !important; }
.entrance-image-frame:active::before { scale: 1.06 1; }
.entrance-image-frame.is-rebounding .mascot-volume { animation: mascot-rebound 480ms var(--ease); }
@keyframes mascot-rebound { 0% { scale: 1.008 .982; } 45% { scale: .996 1.008; } 100% { scale: 1; } }
@keyframes mascot-shadow { 50% { opacity: .78; transform: scaleX(.96); } }
.mascot-body { position: relative; z-index: 1; width: 100%; height: 100%; display: block; object-fit: contain; filter: saturate(.82) contrast(.96); -webkit-mask-image: linear-gradient(to bottom, #000 0 88%, transparent 100%); mask-image: linear-gradient(to bottom, #000 0 88%, transparent 100%); transform: translate3d(var(--shift-x), var(--shift-y), 0) rotateX(var(--tilt-x)) rotateY(var(--tilt-y)) scale(1.025); transition: transform 360ms var(--ease); pointer-events: none; }
.entrance-image-frame:not(.has-logo) :is(.mascot-mouth, .mascot-face) { visibility: hidden; }
.mascot-mouth { position: absolute; z-index: 2; inset: 0; transform: translate3d(var(--shift-x), var(--shift-y), 0) rotateX(var(--tilt-x)) rotateY(var(--tilt-y)) scale(1.025); transition: transform 360ms var(--ease); pointer-events: none; }
.mascot-mouth img { width: 100%; height: 100%; display: block; object-fit: contain; filter: saturate(.82) contrast(.96); transform-origin: 50% 69%; transform: scale(var(--mouth-x, 1), var(--mouth-y, 1)); transition: transform 180ms var(--ease), filter var(--normal); -webkit-mask-image: radial-gradient(ellipse 19% 11% at 50% 69%, #000 48%, transparent 74%); mask-image: radial-gradient(ellipse 19% 11% at 50% 69%, #000 48%, transparent 74%); }
.mascot-face { position: absolute; z-index: 2; inset: 0; pointer-events: none; transform: translate3d(var(--shift-x), var(--shift-y), 0) rotateX(var(--tilt-x)) rotateY(var(--tilt-y)) scale(1.025); transition: transform 360ms var(--ease); }
.mascot-eye { position: absolute; top: 41%; width: 20%; height: 14.7%; overflow: hidden; border-radius: 52% 52% 12% 12% / 82% 82% 12% 12%; background: radial-gradient(ellipse at 42% 60%, #fffdfa 28%, #f0e7ec 74%, #c8aec8 100%); box-shadow: inset 0 2px 5px rgba(73, 22, 85, .12); -webkit-mask-image: linear-gradient(#000 94%, transparent 100%); mask-image: linear-gradient(#000 94%, transparent 100%); }
.mascot-eye-left { --lid-x: 37.5%; --pupil-left: 66%; left: 30%; transform: rotate(-1deg); }
.mascot-eye-right { --lid-x: 65%; --pupil-left: 36.5%; left: 52%; transform: rotate(1deg); }
.mascot-pupil { position: absolute; left: var(--pupil-left); top: 76%; width: 37%; aspect-ratio: 1; border-radius: 50%; background: radial-gradient(circle at 31% 25%, rgba(255,255,255,.75) 0 2%, rgba(255,255,255,.15) 5%, transparent 10%), radial-gradient(circle at 42% 38%, #242027, #050407 66%); box-shadow: inset 0 -2px 4px #000, 0 2px 4px rgba(46, 8, 55, .24); transform: translate(calc(-50% + var(--eye-x, 0px)), calc(-50% + var(--eye-y, 0px))) scale(var(--pupil-scale, 1)); transition: transform var(--eye-response, 110ms) cubic-bezier(.2, .8, .3, 1); }
.mascot-lid { position: absolute; inset: -8%; border-radius: 0; background: url("assets/qxb-logo-home.webp") var(--lid-x) 30% / 500% 680% no-repeat; filter: saturate(.82) contrast(.96) brightness(.9); clip-path: inset(0 0 calc(100% - var(--lid-close, 0%)) 0); transition: clip-path 80ms ease-in; }
.mascot-lid::after { content: ""; position: absolute; left: 14%; right: 14%; bottom: 10%; height: 12%; border-bottom: 1px solid rgba(62, 15, 73, .45); border-radius: 50%; }
.entrance-image-frame.is-blinking { --lid-close: 100%; }
.entrance-image-frame.is-theme-changing { --lid-close: 100%; }
.entrance-image-frame.is-rebounding { --pupil-scale: 1.025; --mouth-x: 1.005; --mouth-y: 1.01; }
.entrance-image-frame:active { --lid-close: 18%; --pupil-scale: .98; }
.entrance-image-frame.is-departing .mascot-volume { animation: mascot-depart 260ms ease-in-out both; }
.mascot-body, .mascot-mouth, .mascot-face {  transform-origin: 50% 72%; }
.entrance-image-frame:is(.is-rebounding, .is-departing) :is(.mascot-body, .mascot-mouth, .mascot-face) { animation: none; }
.entrance-portrait figcaption { display: flex; justify-content: space-between; margin-top: 9px; color: var(--faint); font: 9px var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.entrance-copy {
  grid-column: 2;
  grid-row: 2;
  align-self: center;
  justify-self: stretch;
  min-width: 0;
  width: 100%;
  max-width: 34rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.entrance-copy h1 { margin: 16px 0 26px; font-family: var(--display); font-size: clamp(28px, 3vw, 40px); font-weight: 500; line-height: 1.45; letter-spacing: -.025em; }
.greeting-calligraphy { display: block; width: 100%; max-width: 480px; height: auto; }
.home-introduction { display: grid; gap: 8px; }
.entrance-intro { width: 100%; max-width: 36em; margin: 0; color: var(--muted); font-family: var(--display); font-size: 16px; line-height: 1.9; }
.enter-link {
  position: relative;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-top: 28px;
  padding: 18px 0;
  isolation: isolate;
  font-family: var(--display);
  font-size: 18px;
  text-align: left;
  transition: color var(--fast), padding var(--normal) var(--ease);
}
.enter-link > span { position: relative; z-index: 1; }
.enter-link::before,
.enter-link::after {
  content: "";
  position: absolute;
}
.enter-link::before {
  z-index: 0;
  inset: 0;
  background: var(--accent-soft);
  clip-path: circle(0 at var(--hover-x, 50%) var(--hover-y, 50%));
  transition: clip-path 420ms var(--ease);
}
.enter-link::after { left: 0; right: 0; bottom: 0; height: 1px; background: var(--ink); }
.enter-link:is(:hover, :focus-visible)::before { clip-path: circle(150% at var(--hover-x, 50%) var(--hover-y, 50%)); }
.enter-link:is(:hover, :focus-visible) { color: var(--accent); padding-left: 10px; }
.enter-index { font: 10px var(--mono); color: var(--accent); }
.entrance-foot {
  grid-column: 1 / -1;
  grid-row: 3;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font: 10px var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
}

@keyframes entrance-recede { to { opacity: .22; filter: saturate(.65); transform: scale(.975); } }
@keyframes mascot-breathe { 50% { translate: 0 -1px; scale: 1 1.004; } }
@keyframes mascot-depart { 45% { transform: translateY(3px) rotateX(-3deg); } 100% { transform: none; } }

.signature { display: block; width: 116px; height: 46px; }
.signature svg { display: block; width: 100%; height: 100%; }
.home-nav .utility-link { display: inline-flex; align-items: center; gap: 5px; }
.home-nav .utility-link span { transition: transform var(--fast) var(--ease); }
.home-nav .utility-link:hover span { transform: translate(2px, -2px); }
.utility-link { position: relative; min-height: 44px; color: var(--muted); font-size: 13px; }
.utility-link::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 9px; height: 1px; background: var(--accent); transition: right var(--normal) var(--ease); }
.utility-link:hover, .utility-link.is-current { color: var(--ink); }
.utility-link:hover::after, .utility-link.is-current::after { right: 0; }
.shortcut { margin-left: 4px; color: var(--faint); font-size: 9px; }
.head-actions { display: flex; gap: 24px; align-items: center; }
.text-button { color: var(--muted); font: 10px var(--mono); letter-spacing: .06em; text-transform: uppercase; }
.text-button:hover { color: var(--accent); }

a { color: inherit; }
.enter-link, .utility-link, .text-button { text-decoration: none; }
.footer-link { color: inherit; text-decoration: none; }
.footer-link:hover { color: var(--accent); }
.no-script { padding: 20px var(--edge); }
@media (min-width: 761px) and (max-width: 1100px) {
  :root { --edge: 24px; }
  .entrance { grid-template-columns: 1fr 1fr; column-gap: 36px; }
  .entrance-portrait { width: min(100%, 28vw, 300px); }
  .entrance-copy { max-width: none; }
}
@media (min-width: 761px) and (max-height: 720px) {
  .entrance { padding-block: 18px; }
  .entrance-portrait { width: min(28vw, 280px); }
  .entrance-copy h1 { margin-block: 12px 18px; }
  .enter-link { padding-block: 12px; }
  .entrance-foot { margin-top: 12px; padding-top: 12px; }
}
@media (max-width: 760px) {
  :root { --edge: 18px; }
  .entrance { grid-template-columns: 1fr; grid-template-rows: auto auto auto auto; gap: 0; padding-block: 20px; }
  .entrance-head { grid-column: 1 / -1; grid-row: 1; flex-wrap: wrap; gap: 10px 18px; }
  .entrance-portrait { grid-column: 1; grid-row: 2; justify-self: start; width: 144px; margin: 28px 0 12px; }
  .entrance-copy { grid-column: 1; grid-row: 3; max-width: none; align-self: stretch; padding: 0 0 28px; }
  .entrance-copy h1 { margin: 12px 0 18px; font-size: clamp(25px, 6.5vw, 34px); }
  .entrance-foot { grid-row: 4; flex-wrap: wrap; gap: 12px 20px; margin-top: 24px; }
  .entrance-foot > span { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .entrance-image-frame:active .mascot-volume { scale: 1; }
}