:root {
  --paper: #eee9df;
  --paper-bright: #f5f1e9;
  --ink: #171815;
  --ink-soft: rgba(23, 24, 21, .64);
  --line: rgba(23, 24, 21, .18);
  --signal: #a94631;
  --night: #171814;
  --night-soft: rgba(238, 233, 223, .68);
  --display-serif: "Iowan Old Style", "Palatino Linotype", "Songti SC", "SimSun", serif;
  --ui-sans: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --cn-display: "STZhongsong", "华文中宋", "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --cn-reading: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "华文宋体", "SimSun", serif;
  --ease-editorial: cubic-bezier(.22, .72, .18, 1);
}

html, body { background: var(--paper); }

body {
  font-family: var(--ui-sans);
  color: var(--ink);
  text-rendering: geometricPrecision;
}

button, a { -webkit-tap-highlight-color: transparent; }

.app {
  --frame-left: 2.5vw;
  --frame-top: 88px;
  --frame-width: 62vw;
  --frame-height: calc(100vh - 142px);
  background: var(--paper);
  color: var(--ink);
  transition: background-color 760ms var(--ease-editorial), color 480ms ease;
}

.app[data-theme="dark"] { background: var(--night); color: var(--paper); }

.app::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: .17;
  background-image: linear-gradient(90deg, transparent calc(100% - 1px), currentColor 1px);
  background-size: calc(100vw / 12) 100%;
  mask-image: linear-gradient(to bottom, transparent 0, #000 88px, #000 calc(100% - 54px), transparent 100%);
}

.media-layer {
  inset: auto;
  left: var(--frame-left);
  top: var(--frame-top);
  width: var(--frame-width);
  height: var(--frame-height);
  border-radius: 2px;
  object-fit: cover;
  background: #111;
  box-shadow: 0 0 0 1px rgba(255,255,255,.05), 0 24px 70px rgba(30, 24, 17, .08);
  transition: left 1100ms var(--ease-editorial), top 1100ms var(--ease-editorial), width 1100ms var(--ease-editorial), height 1100ms var(--ease-editorial), opacity 680ms var(--ease-editorial), object-position 1100ms var(--ease-editorial);
}

.reverse-canvas { object-fit: cover; }

.wash,
.grain {
  inset: auto;
  left: var(--frame-left);
  top: var(--frame-top);
  width: var(--frame-width);
  height: var(--frame-height);
  border-radius: 2px;
  transition: left 1100ms var(--ease-editorial), top 1100ms var(--ease-editorial), width 1100ms var(--ease-editorial), height 1100ms var(--ease-editorial), background 900ms var(--ease-editorial), opacity 600ms ease;
}

.wash { z-index: 5; opacity: 1; background: transparent; }
.grain { z-index: 6; opacity: .12; mix-blend-mode: soft-light; }

.app[data-composition="overlay-left"][data-theme="dark"] .wash {
  background: linear-gradient(90deg, rgba(7,8,7,.82) 0%, rgba(7,8,7,.55) 31%, transparent 61%);
}

.app[data-composition="overlay-left"][data-theme="light"] .wash {
  background: linear-gradient(90deg, rgba(241,236,226,.93) 0%, rgba(241,236,226,.72) 31%, transparent 60%);
}

.app[data-composition="overlay-right"] .wash {
  background: linear-gradient(270deg, rgba(241,236,226,.93) 0%, rgba(241,236,226,.74) 34%, transparent 64%);
}

.topbar {
  inset: 0 0 auto 0;
  height: 70px;
  padding: 0 2.5vw;
  display: flex;
  align-items: center;
  border-bottom: 1px solid color-mix(in srgb, currentColor 14%, transparent);
  z-index: 20;
  color: inherit;
}

.brand {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
}

.brand-mark {
  font-family: var(--display-serif);
  font-size: clamp(19px, 1.8vw, 27px);
  font-weight: 400;
  letter-spacing: -.055em;
}

.brand-copy {
  padding-left: 12px;
  border-left: 1px solid currentColor;
  font-size: 7px;
  line-height: 1.35;
  letter-spacing: .22em;
  text-transform: uppercase;
}

.top-actions { gap: 4px; color: inherit; }

.collection-link,
.sound {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  border: 0;
  border-radius: 0;
  color: inherit;
  background: transparent;
  box-shadow: none;
  font-family: var(--ui-sans);
  font-size: 10px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: .04em;
}

.collection-link { padding: 0 13px; border-bottom: 1px solid color-mix(in srgb, currentColor 24%, transparent); }
.collection-link span { margin-left: 12px; transition: transform 220ms ease; }
.collection-link:hover span { transform: translate(2px, -2px); }
.sound { padding: 0 8px 0 16px; }
.sound-dot { width: 5px; height: 5px; }

.collection-link:hover,
.sound:hover { color: var(--signal); background: transparent; }

.captions { z-index: 10; }

.caption {
  left: var(--caption-left);
  top: var(--caption-top);
  width: var(--caption-width);
  padding: 0;
  color: inherit;
  text-align: var(--caption-align);
  transform: translateY(26px);
  transition: opacity 620ms ease, transform 860ms var(--ease-editorial);
}

.caption.is-active { transform: translateY(0); }

.app[data-composition^="overlay"] .caption { color: var(--ink); }
.app[data-composition="overlay-left"][data-theme="dark"] .caption { color: var(--paper-bright); }

.chapter-code {
  position: absolute;
  right: -1.5vw;
  top: -12vh;
  z-index: -1;
  font-family: var(--display-serif);
  font-size: clamp(120px, 17vw, 260px);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -.08em;
  color: currentColor;
  opacity: .045;
  pointer-events: none;
}

.app[data-composition^="overlay"] .chapter-code { opacity: .1; }

.kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 28px;
  color: color-mix(in srgb, currentColor 62%, transparent);
  font-size: 9px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: .19em;
  text-transform: uppercase;
}

.kicker::before { content: ""; width: 28px; height: 1px; background: currentColor; opacity: .55; transform: scaleX(0); transform-origin: left; transition: transform 720ms var(--ease-editorial); }
.caption.is-active .kicker::before { transform: scaleX(1); }

.title {
  margin: 0;
  font-family: var(--cn-display);
  font-size: calc(clamp(48px, 6vw, 88px) * var(--title-scale));
  font-weight: 400;
  line-height: 1.04;
  letter-spacing: -.035em;
  text-wrap: balance;
}

.title span {
  display: block;
  white-space: nowrap;
  opacity: 0;
  filter: blur(2px);
  transform: translateY(.36em);
  transition: opacity 400ms ease, filter 460ms ease, transform 620ms var(--ease-editorial);
}
.title span + span { margin-top: .15em; transition-delay: 70ms; }
.caption.is-active .title span { opacity: 1; filter: blur(0); transform: translateY(0); }

.chapter-question {
  max-width: 34em;
  margin: 31px 0 0;
  padding-top: 21px;
  border-top: 1px solid color-mix(in srgb, currentColor 24%, transparent);
  font-family: var(--cn-reading);
  font-size: clamp(14px, 1.1vw, 17px);
  font-weight: 520;
  line-height: 1.7;
  letter-spacing: .02em;
}

.caption-copy {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 56px;
  gap: 22px;
  align-items: start;
  margin: 25px 0 0;
  padding: 0;
  border: 0;
}

.caption-copy p {
  margin: 0;
  color: color-mix(in srgb, currentColor 86%, transparent);
  font-family: var(--cn-reading);
  font-size: clamp(12px, .92vw, 14px);
  line-height: 1.96;
  letter-spacing: .02em;
}

.app[data-theme="light"] .caption-copy p { color: rgba(23, 24, 21, .72); }
.app[data-theme="dark"] .caption-copy p { color: rgba(245, 241, 233, .72); }

.caption-copy small {
  margin: 3px 0 0;
  color: color-mix(in srgb, currentColor 44%, transparent);
  font-size: 7px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: .15em;
  text-transform: uppercase;
}

.chapter-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 27px 0 0;
  padding: 16px 0 15px;
  border-top: 1px solid color-mix(in srgb, currentColor 17%, transparent);
  border-bottom: 1px solid color-mix(in srgb, currentColor 17%, transparent);
}

.chapter-metrics div + div { padding-left: 15px; border-left: 1px solid color-mix(in srgb, currentColor 17%, transparent); }
.chapter-metrics dt { color: color-mix(in srgb, currentColor 44%, transparent); font-size: 7px; font-weight: 600; letter-spacing: .15em; text-transform: uppercase; }
.chapter-metrics dd { margin: 7px 0 0; font-family: var(--display-serif); font-size: clamp(12px, 1vw, 15px); line-height: 1.2; }

.bean-fact {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 12px;
  max-width: none;
  margin: 20px 0 0;
  padding: 0;
  border: 0;
  background: transparent;
  backdrop-filter: none;
}

.bean-fact::before { display: none; }
.bean-fact span { color: var(--signal); font-size: 7px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; }
.bean-fact strong { color: color-mix(in srgb, currentColor 68%, transparent); font-size: 10px; font-weight: 400; line-height: 1.55; letter-spacing: .035em; }

.caption-cta {
  min-height: 44px;
  margin-top: 28px;
  padding: 0 4px 0 0;
  display: inline-flex;
  align-items: center;
  gap: 18px;
  border: 0;
  border-bottom: 1px solid currentColor;
  border-radius: 0;
  color: inherit;
  background: transparent;
  box-shadow: none;
  font-size: 10px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: .04em;
}

.caption-cta i { display: grid; place-items: center; width: 28px; height: 28px; border: 1px solid currentColor; border-radius: 50%; font-style: normal; transition: transform 260ms var(--ease-editorial), color 200ms ease, background 200ms ease; }
.caption-cta:hover { color: inherit; background: transparent; box-shadow: none; }
.caption-cta:hover i { transform: translate(3px, -3px); color: var(--paper); background: var(--ink); }

.progress {
  inset: auto 2.5vw 14px 2.5vw;
  z-index: 22;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
  width: auto;
  color: inherit;
}

.progress button {
  position: relative;
  width: auto;
  min-width: 0;
  min-height: 46px;
  padding: 0 0 11px;
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  border: 0;
  border-radius: 0;
  color: inherit;
  background: transparent;
  opacity: .46;
  transition: opacity 220ms ease, color 220ms ease, transform 260ms var(--ease-editorial);
}

.progress button:hover,
.progress button:focus-visible { opacity: .72; background: transparent; }

.progress button.is-active,
.progress button.is-pending {
  color: var(--signal);
  opacity: 1;
  background: transparent;
}

.progress button.is-active .progress-label { transform: translateY(-2px); }
.progress button.is-active .progress-label-zh,
.progress button.is-active .progress-label-en,
.progress button.is-pending .progress-label-zh,
.progress button.is-pending .progress-label-en { font-weight: 760; }

.progress button::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: color-mix(in srgb, currentColor 30%, transparent);
  transition: height 220ms ease, background 220ms ease;
}

.progress button.is-active::after,
.progress button.is-pending::after { height: 2px; background: var(--signal); }

.progress button::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  z-index: 1;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: transparent;
  transition: background 220ms ease, transform 360ms var(--ease-editorial);
}

.progress button.is-active::before,
.progress button.is-pending::before { background: var(--signal); transform: scale(1.35); }

.progress-label {
  width: auto;
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-end;
  gap: 3px;
  opacity: 1;
  transform: none;
  color: inherit;
  line-height: 1;
  transition: transform 260ms var(--ease-editorial), color 220ms ease;
}

.progress-label-zh { font-size: 10px; font-weight: 650; letter-spacing: .08em; }
.progress-label-en { font-size: 7px; font-weight: 650; letter-spacing: .12em; text-transform: uppercase; }
.progress-line { display: none; }

.hint {
  left: 2.5vw;
  bottom: 67px;
  z-index: 18;
  color: inherit;
  opacity: .64;
  font-size: 8px;
  letter-spacing: .08em;
}

.hint-key { width: 28px; height: 28px; border-color: color-mix(in srgb, currentColor 26%, transparent); }
.counter { right: 2.5vw; bottom: 67px; z-index: 18; color: inherit; font-size: 9px; letter-spacing: .16em; }
.counter strong { font-family: var(--display-serif); font-size: 19px; font-weight: 400; }

.reverse-status {
  top: 22px;
  bottom: auto;
  min-height: 40px;
  max-width: min(74vw, 360px);
  padding: 0 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 1px solid rgba(23, 24, 21, .14);
  border-radius: 99px;
  color: var(--ink);
  background: rgba(245, 241, 233, .92);
  box-shadow: 0 12px 38px rgba(31, 25, 19, .09);
  backdrop-filter: blur(18px);
  font-family: var(--cn-reading);
  font-size: 13px;
  font-weight: 400;
  line-height: 1.35;
  letter-spacing: .035em;
  text-align: center;
  text-transform: none;
  transform: translate(-50%, -8px) scale(.98);
  transition: opacity 360ms ease, transform 480ms var(--ease-editorial);
}

.reverse-status::before { content: ""; flex: 0 0 auto; width: 5px; height: 5px; border-radius: 50%; background: var(--signal); box-shadow: 0 0 0 4px color-mix(in srgb, var(--signal) 10%, transparent); }
.reverse-status.is-visible { transform: translate(-50%, 0) scale(1); }
.app[data-theme="dark"] .reverse-status { color: var(--paper-bright); border-color: rgba(238, 233, 223, .16); background: rgba(23, 24, 21, .88); box-shadow: 0 12px 42px rgba(0, 0, 0, .24); }

.blackout { background: var(--paper); }
.app[data-theme="dark"] .blackout { background: var(--night); }

/* Opening */
.preloader {
  --load: 0%;
  padding: 25px 2.5vw 27px;
  display: block;
  color: var(--ink);
  background: var(--paper);
  opacity: 1;
  visibility: visible;
  clip-path: inset(0 0 0 0);
  transition: clip-path 920ms var(--ease-editorial), visibility 0s linear 920ms;
}

.preloader.is-gone { opacity: 1; visibility: hidden; clip-path: inset(0 0 100% 0); }

.preloader::before {
  inset: 0;
  opacity: 1;
  background:
    radial-gradient(circle at 72% 42%, rgba(183, 119, 73, .18), transparent 24%),
    radial-gradient(circle at 79% 62%, rgba(69, 89, 58, .12), transparent 30%),
    linear-gradient(120deg, rgba(255,255,255,.42), transparent 45%);
  filter: none;
  animation: preloaderDrift 14s ease-in-out infinite alternate;
}

.preloader::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .18;
  background-image:
    linear-gradient(rgba(23,24,21,.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23,24,21,.16) 1px, transparent 1px);
  background-size: calc(100vw / 12) calc(100vh / 8);
  mask-image: linear-gradient(90deg, #000, transparent 70%);
}

.preloader-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100%;
  max-width: none;
  margin: 0;
  text-align: left;
}

.preloader-head {
  display: flex;
  justify-content: space-between;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
  font-size: 8px;
  font-weight: 600;
  letter-spacing: .17em;
}

.preloader-copy { position: absolute; left: 5.7vw; top: 21vh; width: min(51vw, 760px); }
.preloader-eyebrow { margin: 0 0 28px; color: var(--signal); font-size: 9px; font-weight: 600; letter-spacing: .15em; text-transform: uppercase; }
.preloader-eyebrow .eyebrow-divider { margin: 0 .45em; }
.preloader-eyebrow [lang="zh-CN"] {
  font-family: var(--cn-reading);
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: none;
}

.preloader-title {
  margin: 0;
  font-family: var(--cn-display);
  font-size: clamp(58px, 6.4vw, 96px);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: .018em;
  white-space: nowrap;
}

.preloader-intro { max-width: 38em; margin: 35px 0 0; color: var(--ink-soft); font-family: var(--cn-reading); font-size: clamp(14px, 1.15vw, 18px); line-height: 1.75; letter-spacing: .02em; }

.preloader-study {
  position: absolute;
  right: 8vw;
  top: 19vh;
  width: min(31vw, 470px);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
}

.study-orbit { position: absolute; inset: 8%; border: 1px solid rgba(23,24,21,.22); border-radius: 50%; animation: orbitTurn 18s linear infinite; }
.study-orbit::before { content: ""; position: absolute; left: 50%; top: -4px; width: 7px; height: 7px; border-radius: 50%; background: var(--signal); }
.orbit-b { inset: 22%; border-radius: 43% 57% 61% 39% / 48% 38% 62% 52%; animation-duration: 12s; animation-direction: reverse; }

.study-bean {
  position: relative;
  width: 36%;
  height: 52%;
  border-radius: 48% 52% 45% 55% / 58% 56% 44% 42%;
  background: linear-gradient(145deg, #8b3d2d, #4b1f18 65%, #23110e);
  box-shadow: inset 17px 14px 28px rgba(255,255,255,.12), 0 34px 70px rgba(55,31,20,.22);
  transform: rotate(18deg);
  animation: beanFloat 5s var(--ease-editorial) infinite alternate;
}

.study-bean i { position: absolute; left: 47%; top: 8%; width: 7%; height: 84%; border-radius: 50%; background: rgba(22,10,8,.58); transform: rotate(-7deg); box-shadow: 4px 0 7px rgba(255,255,255,.08); }
.preloader-study em { position: absolute; right: 3%; bottom: 7%; font-style: normal; font-size: 8px; letter-spacing: .16em; }

.study-route {
  position: absolute;
  left: 10%;
  right: 10%;
  bottom: -3%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.study-route::before { content: ""; position: absolute; left: 4px; right: 4px; top: 50%; height: 1px; background: rgba(23,24,21,.2); }
.study-route i { position: relative; z-index: 1; display: grid; place-items: center; width: 23px; height: 23px; border: 1px solid rgba(23,24,21,.24); border-radius: 50%; color: rgba(23,24,21,.46); background: var(--paper); font-size: 6px; font-style: normal; animation: routePulse 5s ease-in-out infinite; animation-delay: calc(var(--i) * .7s); }

.preloader-foot {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.preloader-controls {
  margin: 0 0 12px;
  color: var(--ink-soft);
  font-family: var(--cn-reading);
  font-size: 9px;
  font-weight: 400;
  letter-spacing: .1em;
}
.preloader-meta { width: min(36vw, 500px); gap: 20px; color: var(--ink); font-size: 8px; font-weight: 600; letter-spacing: .13em; }
.preloader-meta span:first-child {
  font-family: var(--cn-reading);
  font-weight: 500;
  letter-spacing: .08em;
}
.preloader-meta::before { content: ""; position: absolute; left: 0; right: 0; bottom: -8px; height: 1px; background: var(--line); }
.preloader-meta::after { content: ""; position: absolute; left: 0; bottom: -8px; width: var(--load); height: 1px; background: var(--signal); transition: width 180ms linear; }

.enter {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 5px 0 22px;
  gap: 24px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  color: var(--paper-bright);
  background: var(--ink);
  box-shadow: 0 14px 30px rgba(25,22,17,.12);
  font-family: var(--cn-display);
  font-size: 12px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: .1em;
}

.enter span, .enter i { position: relative; z-index: 2; }
.enter span { display: inline-flex; align-items: center; align-self: stretch; }
.enter i { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; color: var(--ink); background: var(--paper-bright); font-family: var(--ui-sans); font-size: 15px; font-style: normal; letter-spacing: 0; transition: transform 280ms var(--ease-editorial); animation: arrowBreathe 2.2s var(--ease-editorial) infinite; }
.enter::before { content: ""; position: absolute; inset: 0; z-index: 0; border-radius: inherit; background: var(--signal); transform: scaleX(0); transform-origin: left; transition: transform 460ms var(--ease-editorial); }
.enter::after { content: ""; display: block; position: absolute; z-index: 1; top: -30%; left: -28%; width: 22%; height: 160%; background: linear-gradient(90deg, transparent, rgba(255,255,255,.22), transparent); transform: skewX(-18deg); animation: buttonGlint 4.2s ease-in-out infinite; }
.enter:hover { color: var(--paper-bright); background: var(--signal); border-color: var(--signal); transform: translateY(-2px); box-shadow: 0 18px 36px rgba(64,31,22,.18); }
.enter:hover::before { transform: scaleX(1); }
.enter:hover i { transform: translateX(4px); animation-play-state: paused; }

@keyframes orbitTurn { to { transform: rotate(360deg); } }
@keyframes beanFloat { from { transform: rotate(14deg) translateY(7px); } to { transform: rotate(21deg) translateY(-8px); } }
@keyframes routePulse { 0%, 16%, 100% { color: rgba(23,24,21,.42); border-color: rgba(23,24,21,.24); transform: scale(1); } 8% { color: var(--paper); border-color: var(--signal); background: var(--signal); transform: scale(1.16); } }
@keyframes arrowBreathe { 0%, 100% { transform: translateX(0); } 50% { transform: translateX(3px); } }
@keyframes buttonGlint { 0%, 62% { left: -28%; opacity: 0; } 72% { opacity: 1; } 88%, 100% { left: 112%; opacity: 0; } }

/* Research panel */
.brand-backdrop { background: rgba(15,15,13,.55); backdrop-filter: blur(8px); }
.brand-panel { width: min(76vw, 1080px); color: var(--ink); background: var(--paper-bright); box-shadow: -30px 0 90px rgba(15,14,12,.18); }
.panel-scroll { padding: 10vh clamp(42px, 6vw, 90px) 150px; }
.panel-close { right: clamp(22px, 3vw, 44px); top: 26px; border: 1px solid var(--line); background: transparent; }
.panel-close:hover { color: var(--paper); background: var(--ink); transform: rotate(8deg); }
.panel-eyebrow, .section-kicker { color: var(--signal); letter-spacing: .16em; }
#panelTitle { max-width: 12em; font-family: var(--cn-display); font-weight: 400; line-height: .98; letter-spacing: -.035em; }
.panel-lead { max-width: 54em; font-family: var(--cn-reading); font-size: clamp(15px, 1.3vw, 19px); line-height: 1.75; }
.panel-index { gap: 8px; }
.panel-index a { min-height: 40px; border-radius: 999px; background: transparent; }
.panel-index a:hover { color: var(--paper); background: var(--ink); }
.panel-section { border-color: var(--line); }
.panel-section h3 { font-family: var(--cn-display); font-weight: 400; letter-spacing: -.025em; }
.interest-button { border-radius: 999px; background: var(--ink); }

@media (max-width: 820px) {
  .app {
    --frame-left: 12px !important;
    --frame-top: 66px !important;
    --frame-width: calc(100vw - 24px) !important;
    --frame-height: 45vh !important;
  }

  .app::after { display: none; }
  .media-layer, .wash, .grain { left: 12px !important; top: 66px !important; width: calc(100vw - 24px) !important; height: 45vh !important; transition-duration: 720ms; }
  .topbar { height: 54px; padding: 0 16px; }
  .brand-copy { display: none; }
  .brand-mark { font-size: 21px; }
  .collection-link { padding: 0 8px; font-size: 9px; }
  .collection-link span { display: none; }
  .sound { width: 34px; padding: 0; justify-content: center; }
  .sound span:last-child { display: none; }

  .caption,
  .caption[data-align="center"],
  .caption[data-align="right"] {
    left: 20px !important;
    right: 20px !important;
    top: 54vh !important;
    width: auto !important;
    text-align: left !important;
  }

  .chapter-code { right: 0; top: -34px; font-size: 110px; }
  .kicker { margin-bottom: 15px; font-size: 7px; }
  .kicker::before { width: 18px; }
  .title { font-size: clamp(33px, 10.2vw, 46px); line-height: 1.05; letter-spacing: -.035em; }
  .title span + span { margin-top: .12em; }
  .chapter-question { margin-top: 16px; padding-top: 14px; font-size: 13px; line-height: 1.65; }
  .caption-copy { grid-template-columns: minmax(0, 1fr); margin-top: 15px; }
  .caption-copy p { font-size: 11px; line-height: 1.78; }
  .caption-copy small { display: none; }
  .chapter-metrics { margin-top: 15px; padding: 11px 0; }
  .chapter-metrics dt { font-size: 6px; }
  .chapter-metrics dd { margin-top: 4px; font-size: 11px; }
  .bean-fact { display: none; }
  .caption-cta { min-height: 38px; margin-top: 10px; font-size: 9px; }
  .caption-cta i { width: 24px; height: 24px; }

  .progress { left: 16px; right: 16px; bottom: 8px; gap: 8px; }
  .progress { gap: 7px; }
  .progress button { min-height: 42px; padding: 0 0 8px; align-items: flex-end; }
  .progress-label { display: inline-flex; gap: 2px; }
  .progress-label-zh { font-size: 8.5px; letter-spacing: .04em; }
  .progress-label-en { max-width: 100%; overflow: hidden; font-size: 6.2px; letter-spacing: .025em; text-overflow: clip; }
  .progress button::after { opacity: .65; }
  .progress button::before { display: none; }
  .progress button::marker { display: none; }
  .progress button { font-size: 0; }
  .progress button[data-step]::marker { content: none; }
  .progress button[data-step] .progress-label { display: inline-flex; }
  .hint { left: 20px; bottom: 43px; }
  .hint-key { width: 24px; height: 24px; }
  .counter { right: 20px; bottom: 43px; }
  .counter strong { font-size: 16px; }
  .reverse-status { top: 72px; bottom: auto; max-width: calc(100vw - 40px); min-height: 38px; padding: 0 15px; font-size: 12px; }

  .preloader { padding: 18px 20px 22px; }
  .preloader-head { font-size: 7px; }
  .preloader-head span:last-child { display: none; }
  .preloader-copy { left: 0; top: 17vh; width: 100%; }
  .preloader-eyebrow { margin-bottom: 18px; font-size: 7px; }
  .preloader-title { font-size: clamp(41px, 11.8vw, 52px); line-height: 1.13; letter-spacing: .012em; }
  .preloader-intro { width: 78%; margin-top: 24px; font-size: 13px; line-height: 1.65; }
  .preloader-study { right: -17vw; top: 39vh; width: 63vw; opacity: .64; }
  .preloader-study em, .study-route { display: none; }
  .preloader-foot { align-items: flex-end; }
  .preloader-controls { display: none; }
  .preloader-meta { width: 42vw; font-size: 7px; }
  .preloader-meta span:first-child { display: none; }
  .enter { min-height: 46px; padding-left: 16px; gap: 12px; font-size: 11px; }
  .enter i { width: 36px; height: 36px; }

  .outro { top: 12px; right: 50px; bottom: auto; }
  .restart { min-height: 34px; padding: 0 10px; align-items: center; justify-content: center; border-color: color-mix(in srgb, currentColor 20%, transparent); background: color-mix(in srgb, var(--paper) 78%, transparent); font-size: 8px; line-height: 1; backdrop-filter: blur(14px); }

  .brand-panel { width: 100%; }
  .panel-scroll { padding: 84px 22px 130px; }
}

@media (max-height: 650px) and (max-width: 820px) {
  .app { --frame-height: 37vh !important; }
  .media-layer, .wash, .grain { height: 37vh !important; }
  .caption, .caption[data-align="center"], .caption[data-align="right"] { top: 44vh !important; }
  .chapter-question { display: none; }
  .caption-copy p { display: -webkit-box; overflow: hidden; -webkit-line-clamp: 3; -webkit-box-orient: vertical; }
  .chapter-metrics { margin-top: 8px; }
  .caption-cta { margin-top: 7px; }
  .caption.is-final .caption-cta { display: none; }
  .preloader-copy { top: 12vh; }
  .preloader-intro { margin-top: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .study-orbit, .study-bean, .study-route i, .enter i, .enter::after { animation: none !important; }
  .preloader { transition: opacity 220ms ease, visibility 0s linear 220ms; clip-path: none; }
  .preloader.is-gone { opacity: 0; clip-path: none; }
}