/* Sindal Technology International Limited — sindaltech.com
   Static and same-origin. IBM Plex is self-hosted under /assets/fonts/.
   Cloudflare caches /assets/* for four hours; every page pins this revision. */

@font-face {
  font-family: "Plex Sans";
  src: url("/assets/fonts/plex-sans.woff2") format("woff2");
  font-weight: 100 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Plex Mono";
  src: url("/assets/fonts/plex-mono-500.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Plex Mono";
  src: url("/assets/fonts/plex-mono-600.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

:root {
  color-scheme: light dark;
  --brand: #176f99;
  --brand-bright: #2e91bd;
  --paper: #f2efe7;
  --paper-raised: #f8f6f0;
  --paper-cool: #e9ece9;
  --ink: #171815;
  --body: #4e514b;
  --muted: #73766f;
  --line: #dcd9d0;
  --line-soft: #e5e2da;
  --line-strong: #b6b5ab;
  --night: #101310;
  --night-ink: #f3f0e7;
  --night-body: #c1c5bd;
  --night-muted: #8e948b;
  --night-line: #303730;
  --link: #145f85;
  --link-hover: #0b415f;

  --page: 82rem;
  --measure: 40rem;
  --sans: "Plex Sans", ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
          "PingFang HK", "PingFang TC", "Hiragino Sans CNS", "Microsoft JhengHei",
          "Noto Sans CJK HK", sans-serif;
  --mono: "Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* Section rhythm — desktop 120–180px, mobile 72–100px */
  --pad-section: clamp(4.5rem, 9.5vw, 10rem);
  --pad-major: clamp(5.5rem, 11vw, 11.5rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #111210;
    --paper-raised: #181916;
    --paper-cool: #161815;
    --ink: #f1eee6;
    --body: #c4c5be;
    --muted: #92958d;
    --line: #2a2c27;
    --line-soft: #212320;
    --line-strong: #4a4d45;
    --brand: #6bb7d8;
    --brand-bright: #8acbe6;
    --link: #81c6e3;
    --link-hover: #b3e1f3;

  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 0;
  overflow-x: hidden;
  background: var(--paper);
  color: var(--body);
  font: 400 1.125rem/1.66 var(--sans);
  -webkit-font-smoothing: antialiased;
}
[lang="zh-Hant-HK"] { line-height: 1.8; }
[lang="zh-Hant-HK"] p,
[lang="zh-Hant-HK"] li { letter-spacing: .008em; }
/* 中文標題不要在詞中間斷行；真的放不下時仍准許斷字，避免橫向溢出。 */
[lang="zh-Hant-HK"] h1,
[lang="zh-Hant-HK"] h2 { word-break: keep-all; overflow-wrap: break-word; }

.container {
  width: 100%;
  max-width: var(--page);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 4.5rem);
}
.prose { max-width: var(--measure); }
.band { background: var(--paper-cool); }

/* Typography scale
   hero 42–76px · section 32–52px · display 38–64px · lede 19–26px
   body 18px · labels 12px */
h1, h2, h3, h4 { color: var(--ink); font-weight: 550; letter-spacing: -.035em; }
h1 {
  margin: 0;
  font-size: clamp(2.65rem, 5.6vw, 4.75rem);
  line-height: 1.02;
  letter-spacing: -.045em;
  text-wrap: balance;
}
h2 {
  margin: 0 0 1.75rem;
  font-size: clamp(2rem, 3.55vw, 3.25rem);
  line-height: 1.1;
  letter-spacing: -.038em;
  text-wrap: balance;
}
h3 {
  margin: 1.8rem 0 .45rem;
  font-size: 1.15rem;
  line-height: 1.35;
  letter-spacing: -.018em;
  font-weight: 600;
}
p { margin: 0 0 1.2rem; }
p:last-child { margin-bottom: 0; }
ul, ol { margin: 0 0 1.2rem; padding-left: 1.2rem; }
li { margin: 0 0 .55rem; }
li::marker { color: var(--brand); }
strong { color: var(--ink); font-weight: 600; }
address { font-style: normal; }
a {
  color: var(--link);
  text-decoration-thickness: from-font;
  text-underline-offset: .2em;
  transition: color .2s ease;
}
a:hover { color: var(--link-hover); }
:focus-visible { outline: 2px solid var(--brand-bright); outline-offset: 4px; border-radius: 2px; }

.skip {
  position: fixed;
  left: 1rem;
  top: -5rem;
  z-index: 100;
  padding: .7rem 1rem;
  background: var(--ink);
  color: var(--paper);
}
.skip:focus { top: .75rem; }
.eyebrow {
  margin: 0 0 1.5rem;
  color: var(--brand);
  font: 600 .75rem/1.2 var(--mono);
  letter-spacing: .2em;
  text-transform: uppercase;
}
.eyebrow.plain { color: var(--muted); }
.lede {
  max-width: 38rem;
  margin: 2.25rem 0 0;
  color: var(--ink);
  font-size: clamp(1.2rem, 1.85vw, 1.6rem);
  line-height: 1.45;
  letter-spacing: -.018em;
  text-wrap: pretty;
}
.meta { color: var(--muted); font-size: .95rem; }

/* Masthead — plain at rest, translucent once the page moves */
.masthead {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--paper);
  border-bottom: 1px solid transparent;
  transition: background-color .3s ease, border-color .3s ease;
}
.masthead.is-scrolled {
  background: color-mix(in srgb, var(--paper) 78%, transparent);
  border-bottom-color: var(--line);
  backdrop-filter: blur(16px) saturate(1.4);
}
.masthead .container {
  display: flex;
  min-height: 5.25rem;
  align-items: center;
  justify-content: space-between;
  gap: clamp(2rem, 8vw, 6rem);
}
.brand { display: inline-flex; align-items: center; gap: .78rem; color: var(--ink); text-decoration: none; }
.brand img { display: block; width: auto; height: 2rem; }
.brand .name { display: block; font-size: 1.2rem; font-weight: 600; line-height: 1; letter-spacing: -.035em; }
.brand .sub {
  display: block;
  margin-top: .28rem;
  color: var(--muted);
  font: 500 .54rem/1 var(--mono);
  letter-spacing: .17em;
  text-transform: uppercase;
}
.topnav { display: flex; align-items: center; gap: clamp(1.1rem, 2.7vw, 2.4rem); font-size: .9rem; }
.topnav a {
  position: relative;
  padding-block: .35rem;
  color: var(--muted);
  text-decoration: none;
  transition: color .2s ease;
}
.topnav a:not(.lang-jump)::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s cubic-bezier(.2,.7,.2,1);
}
.topnav a:hover, .topnav a[aria-current] { color: var(--ink); }
.topnav a:not(.lang-jump):hover::after,
.topnav a[aria-current]:not(.lang-jump)::after { transform: scaleX(1); }
.topnav .lang-jump {
  padding: .5rem .9rem;
  border: 1px solid var(--line-strong);
  color: var(--ink);
  transition: border-color .2s ease, background-color .2s ease;
}
.topnav .lang-jump:hover { border-color: var(--ink); background: color-mix(in srgb, var(--ink) 5%, transparent); }

/* Hero — the heaviest moment on the site */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(4rem, 7vw, 6.5rem) 0;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .5;
  background-image:
    linear-gradient(to right, color-mix(in srgb, var(--line) 60%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in srgb, var(--line) 45%, transparent) 1px, transparent 1px);
  background-size: min(9vw, 7.5rem) min(9vw, 7.5rem);
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.45), transparent 70%);
}
.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(15rem, 26rem);
  align-items: center;
  gap: clamp(3rem, 7vw, 7rem);
}
.hero h1 { max-width: 11em; }
.hero .lede { max-width: 34rem; }
[lang="zh-Hant-HK"] .hero h1 { max-width: none; letter-spacing: -.04em; }
[lang="zh-Hant-HK"] .hero .lede { max-width: 30rem; }

/* Product entry points and a readable workflow, in both colour schemes. */
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.75rem; margin-top: 2rem; }
.button, .text-link {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 1rem;
  font-weight: 500;
}
.button { padding: .85rem 1.25rem; color: var(--paper); background: var(--ink); text-decoration: none; }
.button:hover { color: var(--paper); background: var(--link); }
.text-link { padding-block: .5rem; }
.workflow { margin: 0; width: 100%; }
.workflow figcaption { display: flex; flex-wrap: wrap; align-items: baseline; gap: .75rem; margin-bottom: 1.5rem; font-size: .85rem; color: var(--muted); }
.workflow .eyebrow { margin: 0; }
.workflow-stages { margin: 0; padding: 0; list-style: none; }
.workflow-stages li {
  position: relative;
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: 1rem;
  margin: 0;
  padding: 1.35rem;
  border: 1px solid var(--line-strong);
  background: var(--paper-raised);
}
.workflow-stages li + li { margin-top: 1.5rem; }
.workflow-stages li + li::before {
  content: "";
  position: absolute;
  left: 2.35rem;
  bottom: 100%;
  height: 1.5rem;
  border-left: 1px solid var(--brand);
}
.workflow-stages li:last-child { border-color: var(--brand); }
.workflow-number { color: var(--brand); font: 500 .8rem/1.8 var(--mono); }
.workflow-stages strong { display: block; font-size: 1.1rem; line-height: 1.35; }
.workflow-stages p { margin: .4rem 0 0; font-size: .95rem; line-height: 1.5; }
.workflow-note { margin-top: 1.25rem; color: var(--muted); font-size: .85rem; line-height: 1.5; }

/* Content rhythm — every section carries a different layout role */
.block { padding: var(--pad-section) 0; }
.hero + .block { padding-top: clamp(4rem, 8vw, 8rem); }
.block + .block:not(.band):not(.band-dark) { border-top: 1px solid var(--line-soft); }
.split {
  display: grid;
  grid-template-columns: minmax(0, 11rem) minmax(0, 1fr);
  column-gap: clamp(2.5rem, 8vw, 8rem);
  row-gap: 3rem;
}
.split-head { grid-column: 1; align-self: start; margin-top: .55rem; }
.split-body { grid-column: 2; max-width: var(--measure); }
.split-body > h2:first-child { margin-top: 0; }
.split > .full { grid-column: 1 / -1; }
.split > .prose.full { grid-column: 2; }

/* Company — large type, wide margins, no boxes at all */
.statement { padding-block: var(--pad-section); }
.statement .split-body { max-width: none; }
.statement h2 {
  max-width: 16em;
  font-size: clamp(2.25rem, 4.4vw, 4rem);
  line-height: 1.05;
  letter-spacing: -.045em;
}
.statement-body {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: clamp(2.5rem, 6vw, 5.5rem);
  margin-top: clamp(2.5rem, 5vw, 4.5rem);
  max-width: 58rem;
}
.statement-body p { margin: 0; }
[lang="zh-Hant-HK"] .statement h2 { max-width: 14em; }

/* Product — full-width showcase, then a horizontal process line */
.product { padding-block: var(--pad-major); }
.product .split-body { max-width: none; }
.product-head {
  display: grid;
  grid-template-columns: minmax(0, 20rem) minmax(0, 1fr);
  align-items: end;
  column-gap: clamp(2.5rem, 7vw, 6rem);
  row-gap: 1.75rem;
}
.product-name {
  margin: 0;
  font-size: clamp(3rem, 7vw, 6rem);
  line-height: .92;
  letter-spacing: -.055em;
}
.product-head .lede { margin: 0; max-width: 30rem; }
.product-copy { max-width: var(--measure); margin-top: clamp(2rem, 4vw, 3.25rem); }
.product-rule {
  margin: clamp(3rem, 6vw, 5rem) 0 0;
  height: 1px;
  border: 0;
  background: linear-gradient(to right,
    var(--line-strong) 0%,
    var(--line-strong) 22%,
    var(--line) 22%,
    var(--line) 100%);
}

/* Process */
.steps {
  counter-reset: step;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(2.5rem, 5vw, 4.5rem);
  margin: clamp(2.5rem, 5vw, 4rem) 0 0;
  padding: 0;
  list-style: none;
}
.product-rule + .steps { margin-top: 0; }
.steps li {
  position: relative;
  counter-increment: step;
  margin: 0;
  padding: 2.5rem 0 0;
}
.steps li::before {
  content: "0" counter(step);
  display: block;
  margin-bottom: 1.4rem;
  color: var(--brand);
  font: 600 .75rem/1 var(--mono);
  letter-spacing: .18em;
}
.steps li::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: .5rem;
  height: .5rem;
  margin-top: -.25rem;
  border-radius: 50%;
  background: var(--brand);
}
.steps h3 { margin-top: 0; }
.steps p { margin-top: .5rem; font-size: 1rem; line-height: 1.6; }

/* Dark content band */
.band-dark {
  position: relative;
  overflow: hidden;
  background: var(--night);
  color: var(--night-body);
  border-block: 1px solid var(--night-line);
}
.band-dark::after {
  content: "";
  position: absolute;
  width: 32rem;
  height: 32rem;
  right: -16rem;
  top: -16rem;
  border: 1px solid var(--night-line);
  border-radius: 50%;
  box-shadow: 0 0 0 6rem rgba(255,255,255,.012), 0 0 0 12rem rgba(255,255,255,.007);
  pointer-events: none;
}
.band-dark .container { position: relative; z-index: 1; }
.band-dark h2, .band-dark h3, .band-dark strong { color: var(--night-ink); }
.band-dark .eyebrow.plain, .band-dark li::marker { color: var(--brand-bright); }
.band-dark a { color: #8fd0eb; }
.band-dark a:hover { color: #c6ecfa; }

/* Contact — one minimal, oversized call to action */
.contact { padding-block: var(--pad-major); }
.contact .split-body { max-width: 48rem; }
.contact h2 {
  margin-bottom: 2.5rem;
  font-size: clamp(2.5rem, 5.4vw, 4.75rem);
  line-height: 1;
  letter-spacing: -.05em;
}
.contact-lines { margin: 0; padding: 0; list-style: none; }
.contact-lines li {
  margin: 0;
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
}
.contact-lines li:last-child { border-bottom: 1px solid var(--line); }
.contact-lines .contact-label {
  display: block;
  margin-bottom: .5rem;
  color: var(--muted);
  font: 600 .72rem/1 var(--mono);
  letter-spacing: .18em;
  text-transform: uppercase;
}
.contact-lines a, .contact-lines .email { color: var(--ink); letter-spacing: -.02em; }

/* Legal documents */
.legal-page main { border-bottom: 1px solid var(--line); }
.doc-head { padding: clamp(4rem, 9vw, 7.5rem) 0 2rem; }
.doc-head h1 { max-width: none; font-size: clamp(2.75rem, 6vw, 5rem); }
.doc-head .meta { margin-top: 2rem; }
.doc-split {
  display: grid;
  grid-template-columns: minmax(13rem, 18rem) minmax(0, 1fr);
  column-gap: clamp(3rem, 8vw, 8rem);
}
.doc-split > .full { grid-column: 1 / -1; }
.doc-split > .toc { grid-column: 1; }
.doc-split > .doc { grid-column: 2; }
.toc {
  position: sticky;
  top: 7rem;
  align-self: start;
  max-height: calc(100vh - 9rem);
  overflow-y: auto;
  margin: 4rem 0 6rem;
  padding: 1.25rem 1.5rem 1.25rem 0;
  border-top: 1px solid var(--line-strong);
}
.toc p {
  margin: 0 0 1rem;
  color: var(--muted);
  font: 600 .7rem/1 var(--mono);
  letter-spacing: .18em;
  text-transform: uppercase;
}
.toc ol { margin: 0; padding: 0; list-style: none; counter-reset: toc; }
.toc li { counter-increment: toc; margin: 0 0 .5rem; font-size: .88rem; line-height: 1.45; }
.toc li::before {
  content: counter(toc, decimal-leading-zero);
  margin-right: .6rem;
  color: var(--muted);
  font: 500 .68rem var(--mono);
}
.toc a { color: var(--body); text-decoration: none; }
.toc a:hover { color: var(--ink); text-decoration: underline; }
.doc { padding: 4rem 0 7rem; }
.doc h2 {
  position: relative;
  margin: 4rem 0 1rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line-strong);
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  line-height: 1.15;
  letter-spacing: -.035em;
}
.doc h2:first-of-type { margin-top: 0; }
.doc h3 { color: var(--brand); }
.doc dl { margin: 0 0 1.2rem; }
.doc dt { margin: 1rem 0 .2rem; color: var(--ink); font-weight: 600; }
.doc dd { margin: 0 0 .55rem; }
.panel { margin: 1.5rem 0; padding: 1.75rem; border: 1px solid var(--line); background: var(--paper-raised); }

/* Footer */
.sitefoot {
  padding: clamp(4rem, 8vw, 7rem) 0 2.5rem;
  background: var(--night);
  color: var(--night-muted);
  font-size: .95rem;
}
.sitefoot .brand { color: var(--night-ink); }
.sitefoot .brand .sub { color: var(--night-muted); }
.foot-grid {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(9rem, 1fr) minmax(9rem, 1fr);
  gap: clamp(2rem, 7vw, 7rem);
}
.foot-brand .brand { margin-bottom: 1.5rem; }
.foot-brand address { margin-bottom: 1rem; line-height: 1.7; }
.foot-brand .legal-name { color: var(--night-ink); }
.foot-brand a, .foot-col a { color: var(--night-body); }
.foot-brand a:hover, .foot-col a:hover { color: var(--night-ink); }
.foot-col h2 {
  margin: 0 0 1rem;
  color: var(--night-muted);
  font: 600 .7rem/1 var(--mono);
  letter-spacing: .18em;
  text-transform: uppercase;
}
.foot-col ul { margin: 0; padding: 0; list-style: none; }
.foot-col li { margin: 0 0 .65rem; }
.foot-col a { text-decoration: none; }
.foot-wordmark {
  max-width: var(--page);
  margin: clamp(4rem, 9vw, 8rem) auto 0;
  padding-inline: clamp(1.25rem, 5vw, 4.5rem);
  color: color-mix(in srgb, var(--night-ink) 12%, transparent);
  font-size: clamp(4rem, 15vw, 12rem);
  font-weight: 600;
  line-height: .82;
  letter-spacing: -.06em;
  user-select: none;
}
.foot-base {
  max-width: var(--page);
  margin: 2.5rem auto 0;
  padding: 1.4rem clamp(1.25rem, 5vw, 4.5rem) 0;
  border-top: 1px solid var(--night-line);
  font-size: .82rem;
}

:target { scroll-margin-top: 7.5rem; }

@media (max-width: 62rem) {
  .hero-grid { grid-template-columns: minmax(0, 1fr) minmax(12rem, 18rem); gap: 2.5rem; }
  .split { grid-template-columns: minmax(0, 1fr); gap: 1.5rem; }
  .split-head, .split-body, .split > .prose.full { grid-column: 1; }
  .statement-body { grid-template-columns: minmax(0, 1fr); row-gap: 1.2rem; }
  .statement-body p { margin: 0; }
  .product-head { grid-template-columns: minmax(0, 1fr); align-items: start; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .doc-split { grid-template-columns: minmax(0, 1fr); }
  .doc-split > .toc, .doc-split > .doc { grid-column: 1; }
  .toc { position: static; max-height: none; margin: 2rem 0 0; columns: 2; column-gap: 2rem; }
  .toc p { column-span: all; }
  .doc { padding-top: 4rem; }
}

@media (max-width: 46rem) {
  body { font-size: 1.0625rem; }
  .masthead .container { position: relative; min-height: 0; flex-wrap: wrap; gap: 0; }
  .masthead .brand { min-height: 4.5rem; }
  .brand .sub { display: none; }
  .topnav { width: 100%; justify-content: space-between; gap: .5rem; border-top: 1px solid var(--line); font-size: .85rem; }
  .topnav a:not(.lang-jump) { display: flex; align-items: center; min-height: 2.75rem; }
  .topnav .lang-jump { position: absolute; top: .875rem; right: clamp(1.25rem, 5vw, 4.5rem); display: flex; align-items: center; min-height: 2.75rem; padding: .42rem .75rem; }
  :target { scroll-margin-top: 8.5rem; }
  .hero { padding-block: 3rem; }
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 3rem; }
  .hero .lede { margin-top: 1.5rem; }
  .workflow-stages li { padding: 1rem; gap: .75rem; }
  .workflow-stages li + li { margin-top: 1rem; }
  .workflow-stages li + li::before { left: 2rem; height: 1rem; }
  .steps { grid-template-columns: minmax(0, 1fr); gap: 2.25rem; }
  .contact-lines li { padding: 1.25rem 0; }
  .toc { columns: 1; }
  .doc { padding-block: 3rem 5rem; }
  .foot-grid { grid-template-columns: minmax(0, 1fr); gap: 2.5rem; }
  .foot-wordmark { margin-top: 3.5rem; }
  .foot-base { margin-top: 2rem; }
}

/* Micro-animation — present, but only just.
   Nothing is hidden unless site.js is running and has confirmed it can reveal it. */
@media (prefers-reduced-motion: no-preference) {
  .hero-grid > * { animation: arrive .7s cubic-bezier(.2,.7,.2,1) both; }
  .hero-grid > :nth-child(2) { animation-delay: .12s; }
  @keyframes arrive {
    from { opacity: 0; transform: translateY(1.2rem); }
    to { opacity: 1; transform: translateY(0); }
  }
  .js-reveal .reveal {
    opacity: 0;
    transform: translateY(1rem);
    transition: opacity .5s cubic-bezier(.2,.7,.2,1), transform .5s cubic-bezier(.2,.7,.2,1);
  }
  .js-reveal .reveal.is-in { opacity: 1; transform: none; }
  .js-reveal .reveal:nth-child(2) { transition-delay: .07s; }
  .js-reveal .reveal:nth-child(3) { transition-delay: .14s; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}

@media print {
  .masthead, .toc, .foot-wordmark, .skip { display: none !important; }
  body { color: #000; background: #fff; font-size: 11pt; }
  .band, .band-dark, .hero, .sitefoot { color: #000 !important; background: #fff !important; }
  .band-dark h2, .band-dark h3, .band-dark strong { color: #000 !important; }
  a { color: #000; }
  .doc h2 { break-after: avoid; }
}