:root {
  --ink: #1d1d1f;
  --ink-soft: #6e6e73;
  --blue: #0071e3;
  --blue-link: #0066cc;
  --blue-hover: #0077ed;
  --line: #d2d2d7;
  --paper: #ffffff;
  --mist: #f5f5f7;
  --nav: rgba(255, 255, 255, 0.72);
  --ease: cubic-bezier(0.32, 0.72, 0, 1);
  --ease-ui: ease;
  --fast: 240ms;
  --text: 280ms;
  --stage: 780ms;
  --display: "SF Pro Display", "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --text-font: "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --nav-h: 48px;
}

html[lang="zh-Hans"] {
  --display: "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  --text-font: "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--text-font);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.47;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.lock { overflow: hidden; }

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

button, input, select, textarea { font: inherit; color: inherit; }

h1, h2, h3, p { margin: 0; }

h1, .dek, h2, .lede { text-wrap: balance; }

h1, h2, h3, .logo, .price, .piece-name {
  font-family: var(--display);
}

h1 {
  font-size: clamp(40px, 6vw, 56px);
  font-weight: 600;
  letter-spacing: -0.022em;
  line-height: 1.07;
}

html[lang="zh-Hans"] h1 {
  letter-spacing: 0;
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.2;
}

h2 {
  font-size: clamp(32px, 4vw, 40px);
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.12;
  text-align: center;
}

html[lang="zh-Hans"] h2 { letter-spacing: 0; }

h3 {
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.015em;
}

::selection { background: var(--blue); color: #fff; }

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

.vh {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip {
  position: absolute;
  left: 12px;
  top: -40px;
  z-index: 80;
  background: #fff;
  color: var(--ink);
  padding: 8px 12px;
  border-radius: 8px;
}

.skip:focus { top: 8px; }

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: var(--nav-h);
  background: var(--nav);
  backdrop-filter: saturate(1.8) blur(20px);
  -webkit-backdrop-filter: saturate(1.8) blur(20px);
}

.nav-bar {
  position: relative;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1120px, calc(100% - 44px));
  margin: 0 auto;
}

.logo {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
  z-index: 2;
}

.nav-links {
  position: absolute;
  left: 50%;
  top: 0;
  height: var(--nav-h);
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-links a {
  font-size: 12px;
  color: var(--ink);
  text-decoration: none;
  opacity: 0.8;
  transition: opacity var(--fast) var(--ease-ui);
}

.nav-links a:hover,
.nav-links a[aria-current="true"] { opacity: 1; }

.nav-tools {
  display: flex;
  align-items: center;
  z-index: 2;
}

.lang, .menu-btn {
  background: none;
  border: 0;
  cursor: pointer;
  color: var(--ink);
}

.lang {
  font-size: 12px;
  padding: 8px;
}

.menu-btn {
  display: none;
  width: 44px;
  height: 44px;
  place-items: center;
}

.burger,
.burger::before,
.burger::after {
  display: block;
  width: 16px;
  height: 1px;
  background: var(--ink);
  position: relative;
  transition: transform var(--fast) var(--ease), background-color var(--fast) var(--ease);
}

.burger::before,
.burger::after {
  content: "";
  position: absolute;
  left: 0;
}

.burger::before { top: -5px; }
.burger::after { top: 5px; }

.nav.is-open .burger { background: transparent; }
.nav.is-open .burger::before { top: 0; transform: rotate(45deg); }
.nav.is-open .burger::after { top: 0; transform: rotate(-45deg); }

.sheet {
  height: 100vh;
  min-height: 640px;
  display: flex;
  flex-direction: column;
  background: var(--mist);
  overflow: hidden;
  transition: background-color var(--stage) var(--ease);
}

.hero {
  flex: none;
  background: transparent;
  padding: 76px 0 4px;
  text-align: center;
}

.wrap {
  width: min(980px, calc(100% - 44px));
  margin-inline: auto;
}

.wrap.narrow { width: min(692px, calc(100% - 44px)); }

.eyebrow {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.dek {
  margin: 12px auto 0;
  max-width: 540px;
  min-height: 2.6em;
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.3;
  font-weight: 400;
  color: var(--ink-soft);
}

.price {
  margin-top: 10px;
  font-size: 21px;
  font-weight: 400;
  font-variant-numeric: tabular-nums;
}

.usd-note, .count, .form-note, .footer p, .step-no {
  color: var(--ink-soft);
  font-size: 12px;
}

.usd-note { margin-top: 6px; }

.ctas {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: 980px;
  font-size: 17px;
  line-height: 1;
  font-weight: 400;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--fast) var(--ease-ui), color var(--fast) var(--ease-ui), border-color var(--fast) var(--ease-ui);
}

.btn-fill {
  background: var(--blue);
  color: #fff;
  border: 1px solid var(--blue);
}

.btn-fill:hover { background: var(--blue-hover); border-color: var(--blue-hover); }

.btn-line {
  background: transparent;
  color: var(--blue-link);
  border: 1px solid var(--blue-link);
}

.btn-line:hover { color: var(--blue); border-color: var(--blue); }

.count {
  margin-top: 14px;
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
}

.rail {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2px 18px;
  width: min(920px, 100%);
  margin: 2px auto 0;
  padding: 0 22px 4px;
}

.rail::-webkit-scrollbar { display: none; }

.rail button {
  background: none;
  border: 0;
  padding: 10px 0;
  color: var(--ink-soft);
  font-size: 14px;
  white-space: nowrap;
  cursor: pointer;
  transition: color var(--fast) var(--ease-ui);
}

.rail button[aria-selected="true"] { color: var(--ink); }

.stage {
  flex: 1 1 auto;
  display: grid;
  place-items: center;
  min-height: 0;
  padding: 8px 0 28px;
  background: transparent;
}

.frame {
  position: relative;
  height: 100%;
  width: auto;
  max-width: calc(100% - 32px);
  aspect-ratio: 4 / 3;
  line-height: 0;
  overflow: hidden;
}

.stage-photo {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transform-origin: center center;
  user-select: none;
  -webkit-user-drag: none;
}

.stage-photo.live { z-index: 1; }

.ghost {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.motif {
  position: absolute;
  inset: 0;
  z-index: 3;
  overflow: hidden;
  pointer-events: none;
}

.mote {
  position: absolute;
  pointer-events: none;
}

.nudge {
  position: absolute;
  top: 50%;
  z-index: 4;
  width: 44px;
  height: 44px;
  margin-top: -22px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.64);
  color: var(--ink);
  backdrop-filter: saturate(1.8) blur(16px);
  -webkit-backdrop-filter: saturate(1.8) blur(16px);
  cursor: pointer;
  transition: background-color var(--fast) var(--ease-ui), color var(--fast) var(--ease-ui);
}

.nudge.prev { left: 16px; }
.nudge.next { right: 16px; }
.nudge:hover { background: rgba(255, 255, 255, 0.86); color: var(--blue-link); }

.detail {
  background: var(--mist);
  padding: 8px 0 80px;
}

.specs {
  width: min(880px, calc(100% - 44px));
  margin: 28px auto 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.specs div { padding: 18px 10px; text-align: center; }
.specs div + div { border-left: 1px solid var(--line); }

.specs dt {
  font-size: 12px;
  color: var(--ink-soft);
}

.specs dd {
  margin: 6px 0 0;
  font-size: 14px;
  color: var(--ink);
}

.story {
  width: min(640px, calc(100% - 44px));
  margin: 28px auto 0;
  text-align: center;
  font-size: 17px;
  line-height: 1.47;
  min-height: 5.4em;
}

.section { padding: 96px 0; background: var(--paper); }
.section-gray { background: var(--mist); }

.lede {
  margin: 12px auto 0;
  max-width: 640px;
  text-align: center;
  font-size: 19px;
  line-height: 1.4;
  color: var(--ink-soft);
}

.grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 56px 28px;
  margin-top: 56px;
}

.piece {
  width: min(300px, 100%);
  padding: 0;
  border: 0;
  background: transparent;
  text-align: center;
  cursor: pointer;
  color: inherit;
}

.piece img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: #dedede;
}

.piece-name {
  display: block;
  margin-top: 14px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.015em;
  transition: color var(--fast) var(--ease-ui);
}

.piece-price {
  display: block;
  margin-top: 4px;
  font-size: 14px;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
}

.piece-now {
  display: none;
  margin-top: 4px;
  font-size: 12px;
  color: var(--blue-link);
}

.piece[aria-current="true"] .piece-now { display: block; }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px 28px;
  margin-top: 56px;
  text-align: center;
}

.step svg { color: var(--ink); }
.step-no { margin-top: 14px; letter-spacing: 0.08em; }
.step h3 { margin-top: 6px; }
.step p:last-child {
  margin-top: 8px;
  color: var(--ink);
  font-size: 17px;
}

.facts {
  width: min(692px, 100%);
  margin: 40px auto 0;
}

.facts div {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 18px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  text-align: left;
}

.facts div:last-child { border-bottom: 1px solid var(--line); }
.facts dt { font-size: 14px; color: var(--ink-soft); }
.facts dd { margin: 0; font-size: 17px; }

.body {
  margin-top: 18px;
  text-align: center;
  font-size: 19px;
  line-height: 1.47;
}

.faq {
  width: min(692px, 100%);
  margin: 36px auto 0;
  border-bottom: 1px solid var(--line);
}

.qa-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
  background: none;
  border: 0;
  border-top: 1px solid var(--line);
  color: var(--ink);
  font-size: 17px;
  text-align: left;
  cursor: pointer;
}

.plus { flex: none; transition: transform var(--fast) var(--ease); }
.qa.is-open .plus { transform: rotate(45deg); }

.qa-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 320ms var(--ease);
}

.qa.is-open .qa-panel { grid-template-rows: 1fr; }
.qa-inner { overflow: hidden; }
.qa-inner p { margin: 0 0 18px; font-size: 17px; line-height: 1.47; }

.form, .thanks {
  width: min(480px, 100%);
  margin: 32px auto 0;
  text-align: left;
}

.form[hidden],
.thanks[hidden] { display: none !important; }

.form { display: grid; gap: 6px; }

.form label {
  display: grid;
  gap: 6px;
  font-size: 14px;
}

.form input,
.form select,
.form textarea {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 11px;
  font-size: 17px;
}

.form textarea { min-height: 120px; resize: vertical; }

.form input[aria-invalid="true"],
.form select[aria-invalid="true"],
.form textarea[aria-invalid="true"] { border-color: #e30000; }

::placeholder { color: var(--ink-soft); opacity: 1; }

.err {
  min-height: 16px;
  font-size: 12px;
  color: #e30000;
}

.form .btn { justify-self: start; margin-top: 6px; }
.form-note { margin-top: 8px; line-height: 1.4; }

.thanks h3 {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.thanks p { margin: 12px 0 20px; }

.legal { padding-top: 28px; padding-bottom: 28px; }
.legal h2 { text-align: left; font-size: 28px; }

.prose {
  width: min(692px, calc(100% - 44px));
  margin-inline: auto;
  text-align: left;
}

.prose p { margin-top: 12px; }

.footer {
  padding: 28px 22px 40px;
  border-top: 1px solid var(--line);
  text-align: center;
}

.footer nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 18px;
  margin-bottom: 16px;
}

.footer a {
  color: var(--ink);
  font-size: 12px;
  text-decoration: none;
}

.footer a:hover { color: var(--blue-link); }
.footer p { margin-top: 6px; }
.footer p:last-child { margin-top: 14px; color: var(--ink); font-size: 12px; }

.swap {
  transition: opacity var(--text) var(--ease), transform var(--text) var(--ease);
}

.swap.is-out {
  opacity: 0;
  transform: translateY(-8px);
}

.swap.is-in {
  opacity: 0;
  transform: translateY(8px);
  transition: none;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms var(--ease), transform 700ms var(--ease);
}

.reveal.is-inview {
  opacity: 1;
  transform: none;
}

@media (hover: hover) {
  .piece:hover .piece-name { color: var(--blue-link); }
}

@media (min-width: 735px) {
  .piece { width: calc(50% - 14px); max-width: 360px; }
}

@media (min-width: 1069px) {
  .piece { width: calc(33.333% - 19px); max-width: 320px; }
}

@media (max-width: 900px) {
  .menu-btn { display: grid; }

  .nav-links {
    display: none;
    position: fixed;
    inset: var(--nav-h) 0 0 0;
    transform: none;
    left: 0;
    height: auto;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 12px 24px 32px;
    background: rgba(250, 250, 252, 0.96);
    backdrop-filter: saturate(1.8) blur(20px);
    -webkit-backdrop-filter: saturate(1.8) blur(20px);
    z-index: 45;
  }

  .nav.is-open .nav-links { display: flex; }

  .nav-links a {
    font-size: 21px;
    padding: 14px 0;
    opacity: 1;
  }

  .hero { padding: 68px 0 0; }
  .dek { min-height: 0; }
  .story { min-height: 0; }
  .section { padding: 64px 0; }
  .sheet { height: auto; min-height: 100vh; overflow: visible; }
  .frame { height: auto; width: min(100% - 24px, 640px); }

  .specs { grid-template-columns: 1fr 1fr; }
  .specs div + div { border-left: 0; }
  .specs div:nth-child(even) { border-left: 1px solid var(--line); }
  .specs div:nth-child(n + 3) { border-top: 1px solid var(--line); }

  .steps { grid-template-columns: 1fr; }
  .facts div { grid-template-columns: 1fr; gap: 4px; }
  .nudge.prev { left: 8px; }
  .nudge.next { right: 8px; }
}

@media (max-width: 540px) {
  .ctas { flex-direction: column; align-items: center; }
  .h1, h1 { font-size: 34px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .swap, .qa-panel, .hero, .plus { transition: none; }
}