:root {
  color-scheme: light;

  /* Color */
  --color-ink: #111827;
  --color-ink-soft: #344054;
  --color-muted: #667085;
  --color-line: #dfe3ec;
  --color-line-strong: #cbd2df;
  --color-paper: #fffefa;
  --color-canvas: #f7f7fa;
  --color-mist: #eff0f7;
  --color-violet: #5145df;
  --color-violet-deep: #3f35bd;
  --color-violet-soft: #eeecff;
  --color-warm: #bc536c;
  --color-warm-soft: #fff0f2;
  --color-notice: #fff8df;
  --color-notice-ink: #644b07;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Noto Sans CJK SC", "Segoe UI", sans-serif;
  --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Noto Sans CJK SC", "Segoe UI", sans-serif;
  --text-display: clamp(3.3rem, 8vw, 7.2rem);
  --text-h1: clamp(2.75rem, 6vw, 5.6rem);
  --text-h2: clamp(2rem, 4.3vw, 4rem);
  --text-h3: clamp(1.25rem, 2vw, 1.55rem);
  --text-body-lg: clamp(1.125rem, 1.8vw, 1.35rem);
  --text-body: 1rem;
  --text-meta: .78rem;
  --text-document-title: clamp(2.2rem, 4vw, 3.6rem);
  --text-support-title: clamp(2.5rem, 4.5vw, 4.2rem);
  --leading-tight: 1.08;
  --leading-body: 1.78;

  /* Spacing */
  --space-1: .25rem;
  --space-2: .5rem;
  --space-3: .75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4.5rem;
  --space-9: 6rem;
  --space-10: 9rem;

  /* Shape and elevation */
  --radius-sm: .75rem;
  --radius-md: 1.25rem;
  --radius-lg: 2rem;
  --radius-xl: 3rem;
  --shadow-ui: 0 2rem 5rem rgba(29, 32, 63, .14);
  --shadow-soft: 0 1rem 3rem rgba(29, 32, 63, .07);

  /* Layout */
  --container: 76rem;
  --reading: 45rem;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --header-height: 5.5rem;

  /* Motion */
  --duration-fast: 160ms;
  --duration-slow: 600ms;
  --ease-flow: cubic-bezier(.22, 1, .36, 1);

  /* Breakpoints: mobile < 44rem; tablet 44–64rem; desktop > 64rem */
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: var(--leading-body);
  text-rendering: optimizeLegibility;
}
img { display: block; max-width: 100%; }
[hidden] { display: none !important; }
html[data-language="zh"] [data-lang="en"], html[data-language="en"] [data-lang="zh"] { display: none !important; }
a { color: var(--color-violet-deep); text-underline-offset: .18em; }
a:hover { text-decoration-thickness: .12em; }
:focus-visible { outline: 3px solid var(--color-warm); outline-offset: 4px; border-radius: .25rem; }
.skip-link { position: fixed; top: .75rem; left: .75rem; z-index: 100; transform: translateY(-180%); padding: .7rem 1rem; background: var(--color-ink); color: white; }
.skip-link:focus { transform: translateY(0); }

.site-header, .site-footer, .container { width: calc(100% - var(--gutter) - var(--gutter)); max-width: var(--container); margin-inline: auto; }
.site-header { min-height: var(--header-height); display: flex; align-items: center; justify-content: space-between; gap: var(--space-5); }
.header-actions { display: flex; align-items: center; justify-content: flex-end; gap: clamp(1rem, 3vw, 2.5rem); }
.brand { color: var(--color-ink); font-family: var(--font-display); font-size: 1.45rem; font-weight: 800; letter-spacing: -.045em; text-decoration: none; }
.site-nav { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: clamp(.85rem, 2.5vw, 1.8rem); }
.site-nav a { color: var(--color-ink-soft); font-size: .9rem; font-weight: 650; text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--color-violet-deep); }
.language-control { display: none; align-items: center; gap: .2rem; padding-left: clamp(.8rem, 2vw, 1.5rem); border-left: 1px solid var(--color-line); }
.language-enabled .language-control { display: flex; }
.language-control button { min-width: 2.75rem; min-height: 2.75rem; padding: .25rem .45rem; border: 0; border-radius: .55rem; background: transparent; color: var(--color-muted); font: inherit; font-size: .82rem; font-weight: 750; cursor: pointer; }
.language-control button[aria-pressed="true"] { background: var(--color-violet-soft); color: var(--color-violet-deep); }
.language-divider { color: var(--color-line-strong); }

main { display: block; }
.section { position: relative; padding-block: var(--space-10); }
.section--paper { background: var(--color-paper); }
.section--mist { background: var(--color-mist); }
.section--ink { background: var(--color-ink); color: white; }
.section--ink p { color: #d6dbea; }
.eyebrow { margin: 0 0 var(--space-5); color: var(--color-violet-deep); font-size: var(--text-meta); font-weight: 800; letter-spacing: .2em; line-height: 1.4; overflow-wrap: anywhere; text-transform: uppercase; }
.section--ink .eyebrow { color: #b8afff; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 720; letter-spacing: -.045em; text-wrap: balance; }
h1 { max-width: 11ch; margin: 0; font-size: var(--text-h1); line-height: var(--leading-tight); }
h2 { max-width: 14ch; margin: 0; font-size: var(--text-h2); line-height: 1.12; }
h3 { margin: 0; font-size: var(--text-h3); line-height: 1.3; }
.heading-line { display: block; white-space: nowrap; }
.body-line { display: block; }
p, li { color: var(--color-ink-soft); }
.lead { max-width: 35rem; margin: var(--space-6) 0 0; color: var(--color-ink-soft); font-size: var(--text-body-lg); line-height: 1.7; }
.brand-line { max-width: 34rem; margin: var(--space-7) 0 0; padding-left: var(--space-5); border-left: 2px solid var(--color-violet); color: var(--color-ink); font-size: var(--text-body-lg); font-weight: 650; line-height: 1.55; }
.prose { max-width: var(--reading); }
.prose p { margin: var(--space-4) 0 0; }
.prose h2 { max-width: none; margin: var(--space-8) 0 var(--space-4); font-size: clamp(1.45rem, 2.7vw, 2rem); letter-spacing: -.025em; }
.prose h3 { margin: var(--space-6) 0 var(--space-3); }
.meta { color: var(--color-muted); font-size: .9rem; }
code { padding: .12rem .4rem; border-radius: .35rem; background: var(--color-violet-soft); color: var(--color-violet-deep); }

.hero { min-height: min(48rem, calc(100svh - var(--header-height))); display: grid; align-items: center; padding-block: var(--space-7) var(--space-8); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(17rem, .62fr); align-items: center; gap: clamp(3rem, 6vw, 6rem); }
.hero h1 { font-size: var(--text-display); }
.hero .hero-title-zh { font-size: clamp(4.8rem, 6.8vw, 6.25rem); line-height: 1.12; }
.hero [data-lang="en"] h1 { font-size: clamp(4.8rem, 6.4vw, 6.3rem); line-height: 1.08; }
.hero .lead { max-width: 45rem; }
.hero .assist { max-width: 30rem; margin-top: var(--space-5); color: var(--color-muted); }
.hero-visual { position: relative; justify-self: end; width: min(100%, 18.5rem); padding: .55rem; border: 1px solid rgba(17, 24, 39, .13); border-radius: 2.8rem; background: rgba(255,255,255,.72); box-shadow: var(--shadow-ui); transform: rotate(1.2deg); }
.hero-visual::before { content: ""; position: absolute; inset: -2.4rem -2rem auto auto; z-index: -1; width: 9rem; height: 9rem; border-radius: 50%; background: linear-gradient(135deg, rgba(81,69,223,.14), rgba(188,83,108,.1)); filter: blur(1rem); }
.hero-visual img { width: 100%; height: auto; aspect-ratio: 430 / 932; object-fit: contain; border-radius: 2.35rem; }
.visual-caption { margin: var(--space-4) var(--space-3) var(--space-2); color: var(--color-muted); font-size: .78rem; letter-spacing: .06em; }

.split { display: grid; grid-template-columns: minmax(0, .8fr) minmax(18rem, 1fr); align-items: center; gap: clamp(3rem, 9vw, 9rem); }
.split--reverse > :first-child { order: 2; }
.split--reverse > :last-child { order: 1; }
.product-window { position: relative; padding: clamp(.6rem, 1.5vw, 1rem); border: 1px solid var(--color-line); border-radius: var(--radius-lg); background: rgba(255,255,255,.78); box-shadow: var(--shadow-soft); }
.product-window img { width: 100%; height: auto; aspect-ratio: 430 / 932; max-height: none; object-fit: contain; border-radius: calc(var(--radius-lg) - .5rem); }
.product-window--portrait { width: min(100%, 26rem); margin-inline: auto; }
.today-title-zh { max-width: none !important; margin-top: 0 !important; font-size: clamp(2.4rem, 4vw, 3.5rem) !important; line-height: 1.14; white-space: nowrap; }

.continuity-track { position: relative; display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); margin-top: var(--space-8); }
.continuity-track::before { content: ""; position: absolute; top: 1rem; left: 8%; right: 8%; height: 1px; background: linear-gradient(90deg, var(--color-line-strong), var(--color-violet), var(--color-warm)); }
.moment { position: relative; padding-top: var(--space-7); }
.moment::before { content: ""; position: absolute; top: .65rem; left: 0; width: .75rem; height: .75rem; border: 3px solid var(--color-paper); border-radius: 50%; background: var(--color-violet); box-shadow: 0 0 0 1px var(--color-violet); }
.moment:last-child::before { background: var(--color-warm); box-shadow: 0 0 0 1px var(--color-warm); }
.moment span { display: block; color: var(--color-muted); font-size: .8rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.moment strong { display: block; margin-top: var(--space-2); font-size: 1.08rem; }

.continuity-layout { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(17rem, .58fr); gap: clamp(3rem, 7vw, 7rem); align-items: start; }
.continuity-copy { position: sticky; top: var(--space-6); }
.continuity-copy .lead p { margin: 0 0 var(--space-4); }
.continuity-title-zh { margin-top: 0 !important; font-size: clamp(2.5rem, 4vw, 3.6rem) !important; line-height: 1.2; }
.continuity-layout .product-window--portrait { align-self: start; width: min(100%, 22rem); margin-block: var(--space-4) 0; }

.perspective-stage { margin-top: var(--space-8); }
.perspective-lead-zh { max-width: none; white-space: nowrap; }
.perspective-labels { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); margin-bottom: var(--space-6); }
.perspective-label { padding-top: var(--space-4); border-top: 1px solid var(--color-line-strong); }
.perspective-label strong { display: block; }
.perspective-label span { color: var(--color-muted); }
.screen-flow { display: grid; grid-template-columns: repeat(3, 1fr); align-items: start; gap: clamp(.75rem, 2vw, 1.5rem); }
.screen-flow .product-window:nth-child(2) { margin-top: var(--space-7); }
.screen-flow .product-window:nth-child(3) { margin-top: calc(var(--space-7) * 2); }

.rhythm-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(18rem, .9fr); gap: clamp(3rem, 7vw, 7rem); align-items: center; }
.rhythm-title-zh { margin-top: 0 !important; font-size: clamp(2.5rem, 4vw, 3.6rem) !important; line-height: 1.18; }
.rhythm-lead-zh { max-width: none; }
.rhythm-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--color-line-strong); }
.rhythm-list li { display: grid; grid-template-columns: 2.5rem 1fr; gap: var(--space-4); padding: var(--space-5) 0; border-bottom: 1px solid var(--color-line); }
.rhythm-list b { color: var(--color-violet-deep); font-variant-numeric: tabular-nums; }
.rhythm-list span { color: var(--color-ink); font-size: var(--text-body-lg); }

.ownership-facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); margin-top: var(--space-8); }
.ownership-facts div { padding-top: var(--space-5); border-top: 1px solid #475069; }
.ownership-facts strong { display: block; color: white; font-size: 1.15rem; }
.ownership-facts p { margin-bottom: 0; }
.ownership-lead-zh { max-width: none; }

.choice-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); margin-top: var(--space-8); }
.choice { padding: var(--space-6) 0 0; border-top: 2px solid var(--color-line-strong); }
.choice:nth-child(2) { border-color: var(--color-violet); }
.choice:nth-child(3) { border-color: var(--color-warm); }
.choice .choice-name { color: var(--color-muted); font-size: .8rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.choice h3 { margin-top: var(--space-3); }
.choice ul { padding-left: 1.2rem; }
.choice li { margin-bottom: var(--space-2); }

.closing { min-height: 90vh; display: grid; place-items: center; text-align: center; }
.closing h2 { max-width: 15ch; margin-inline: auto; }
.closing-brand { margin: var(--space-8) 0 var(--space-2); font-family: var(--font-display); font-size: 1.6rem; font-weight: 800; letter-spacing: -.04em; }
.closing-secondary { margin: var(--space-3) auto 0; color: var(--color-muted); font-size: .95rem; }
.closing-en { margin-top: var(--space-8); padding-top: var(--space-6); border-top: 1px solid var(--color-line); color: var(--color-muted); }

.button { display: inline-flex; min-height: 2.9rem; align-items: center; justify-content: center; padding: .65rem 1.05rem; border-radius: var(--radius-sm); background: var(--color-violet); color: white; font-weight: 750; text-decoration: none; transition: background var(--duration-fast), transform var(--duration-fast); }
.button:hover { background: var(--color-violet-deep); transform: translateY(-1px); }
.button--quiet { background: var(--color-violet-soft); color: var(--color-violet-deep); }
.button--quiet:hover { background: #e2dfff; }

.legal-main { padding-block: var(--space-7) var(--space-10); }
.legal-layout { display: grid; grid-template-columns: 12rem minmax(0, var(--reading)); justify-content: center; gap: clamp(3rem, 7vw, 7rem); align-items: start; }
.toc { position: sticky; top: var(--space-6); }
.toc p { margin-top: 0; color: var(--color-muted); font-size: var(--text-meta); font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.toc a { display: block; padding: .3rem 0; color: var(--color-ink-soft); font-size: .9rem; text-decoration: none; }
.legal-article { min-width: 0; }
.legal-article > h1 { max-width: 12ch; }
.document-title { max-width: none; font-size: var(--text-document-title); line-height: 1.12; }
.support-title { max-width: none; font-size: var(--text-support-title); line-height: 1.1; }
.legal-intro { margin-bottom: var(--space-8); }
.notice { margin: var(--space-5) 0 var(--space-7); padding: var(--space-4) var(--space-5); border-left: 3px solid #c99818; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; background: var(--color-notice); color: var(--color-notice-ink); }
.glance { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); margin: var(--space-7) 0 var(--space-8); }
.glance div { padding-top: var(--space-4); border-top: 2px solid var(--color-violet-soft); }
.glance strong { display: block; line-height: 1.35; }
.glance span { display: block; margin-top: .35rem; color: var(--color-muted); font-size: .9rem; line-height: 1.5; }
.lang { margin-top: var(--space-10); padding-top: var(--space-8); border-top: 1px solid var(--color-line-strong); }
.lang > h1, .lang > .lang-title { max-width: 14ch; margin: 0; font-size: clamp(2.4rem, 5vw, 4.6rem); line-height: 1.12; }
.contact-panel { margin: var(--space-8) 0; padding: var(--space-6); border: 1px solid var(--color-line); border-radius: var(--radius-md); background: var(--color-paper); }
.contact-panel h2 { margin-top: 0; }

.site-footer { display: grid; grid-template-columns: 1fr auto; gap: var(--space-6); padding-block: var(--space-7); border-top: 1px solid var(--color-line); color: var(--color-muted); font-size: .88rem; }
.footer-brand { color: var(--color-ink); font-size: 1.15rem; font-weight: 800; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: var(--space-4); }
.footer-links a { color: var(--color-ink-soft); text-decoration: none; }
.footer-meta { grid-column: 1 / -1; display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-4); padding-top: var(--space-4); border-top: 1px solid var(--color-line); }

@media (max-width: 64rem) {
  :root { --space-10: 7rem; }
  .hero { min-height: auto; padding-block: var(--space-7) var(--space-9); }
  .hero-grid, .split, .continuity-layout, .rhythm-layout { gap: var(--space-7); }
  .hero-grid { grid-template-columns: minmax(0, 1fr) minmax(16rem, .65fr); }
  .hero-visual { width: min(100%, 17rem); }
  .desktop-break { display: none; }
  .today-title-zh { font-size: clamp(2rem, 4vw, 2.75rem) !important; white-space: normal; }
  .continuity-title-zh, .rhythm-title-zh { font-size: clamp(2rem, 4vw, 2.8rem) !important; }
  .perspective-lead-zh { white-space: normal; }
  .screen-flow { grid-template-columns: repeat(3, minmax(13rem, 1fr)); overflow-x: auto; padding: 0 var(--gutter) var(--space-5); margin-inline: calc(-1 * var(--gutter)); scroll-snap-type: x mandatory; }
  .screen-flow .product-window { scroll-snap-align: center; }
  .screen-flow .product-window:nth-child(n) { margin-top: 0; }
}

@media (max-width: 44rem) {
  :root { --header-height: auto; --space-8: 3.5rem; --space-9: 4.5rem; --space-10: 6rem; --gutter: 1.2rem; }
  .site-header { display: grid; grid-template-columns: 1fr auto; align-items: center; padding-block: var(--space-5); }
  .header-actions { display: contents; }
  .site-nav { grid-column: 1 / -1; grid-row: 2; justify-content: flex-start; gap: .25rem 1rem; }
  .site-nav a { min-height: 2.75rem; display: inline-flex; align-items: center; }
  .language-control { grid-column: 2; grid-row: 1; padding-left: .6rem; }
  .language-control button { min-width: 2.55rem; }
  .hero h1, .hero .hero-title-zh, .hero [data-lang="en"] h1 { font-size: clamp(2.8rem, 14vw, 4rem); line-height: 1.12; }
  .heading-line { white-space: nowrap; }
  .hero { min-height: auto; padding-top: var(--space-7); }
  .hero-grid, .split, .continuity-layout, .rhythm-layout { grid-template-columns: minmax(0, 1fr); }
  .hero-grid > *, .split > *, .continuity-layout > *, .rhythm-layout > * { min-width: 0; }
  .hero-visual { justify-self: center; width: min(82vw, 17.5rem); margin-top: var(--space-4); transform: none; }
  .hero-visual::before { right: 0; }
  .closing #closing-title-en { max-width: none; }
  .split--reverse > :first-child, .split--reverse > :last-child { order: initial; }
  .split .product-window, .split--reverse .product-window { order: 2; }
  .continuity-copy { position: static; }
  .continuity-track { grid-template-columns: 1fr; gap: var(--space-6); margin-left: .35rem; }
  .continuity-track::before { top: 1rem; bottom: 1rem; left: .38rem; right: auto; width: 1px; height: auto; background: linear-gradient(180deg, var(--color-line-strong), var(--color-violet), var(--color-warm)); }
  .moment { padding: 0 0 0 var(--space-7); }
  .moment::before { top: .3rem; left: 0; }
  .perspective-labels { grid-template-columns: 1fr; }
  .screen-flow { width: 100%; grid-template-columns: repeat(3, minmax(78vw, 1fr)); margin-inline: 0; padding-inline: 0; contain: inline-size; }
  .ownership-facts, .choice-grid, .glance { grid-template-columns: 1fr; }
  .legal-layout { grid-template-columns: 1fr; }
  .toc { position: static; display: flex; flex-wrap: wrap; gap: .15rem 1rem; padding-bottom: var(--space-5); border-bottom: 1px solid var(--color-line); }
  .toc p { flex-basis: 100%; }
  .toc a { min-height: 2.75rem; display: inline-flex; align-items: center; }
  .site-footer { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
  .footer-meta { display: grid; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}