/* Download Center project site.
   Identity: the app icon's crayon hatching (blue into indigo) and the torrent fragment bar from the task list.
   No web fonts: system faces, rounded where the platform has them, like the app's speed figures. */
:root {
  color-scheme: light dark;
  --page: #ffffff;
  --sheet: #f4f5fa;
  --ink: #161a33;
  --muted: #565c78;
  --rule: #e1e3ee;
  --blue: #2a55e0;
  --indigo: #5a3fd4;
  --link: #2347c9;
  --cell: #dfe2ee;
  --lit: #2f6bff;
  --done: #23a050;
  --seed: #0f9aa8;
  --on-blue: #ffffff;
  --shadow: 0 30px 70px -30px rgba(22, 26, 51, .45), 0 2px 8px rgba(22, 26, 51, .08);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Hiragino Sans", "Noto Sans TC", "Microsoft JhengHei UI", "Noto Sans", Roboto, sans-serif;
  --round: ui-rounded, "SF Pro Rounded", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Noto Sans TC", "Microsoft JhengHei UI", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --hatch: repeating-linear-gradient(-58deg, rgba(255, 255, 255, .16) 0 1.5px, transparent 1.5px 4.5px),
           repeating-linear-gradient(-52deg, rgba(255, 255, 255, .08) 0 1px, transparent 1px 7px),
           linear-gradient(165deg, #3f74ff 0%, #4a52e6 55%, #5b3cd2 100%);
}
@media (prefers-color-scheme: dark) {
  :root {
    --page: #0e1022;
    --sheet: #171a31;
    --ink: #eceef8;
    --muted: #a4a9c6;
    --rule: #2a2e4c;
    --blue: #8aa2ff;
    --indigo: #b2a0ff;
    --link: #9db2ff;
    --cell: #2b3051;
    --lit: #5b8cff;
    --done: #43c36c;
    --seed: #3cc6d4;
    --on-blue: #0e1022;
    --shadow: 0 30px 70px -30px rgba(0, 0, 0, .8), 0 2px 8px rgba(0, 0, 0, .4);
    --hatch: repeating-linear-gradient(-58deg, rgba(255, 255, 255, .10) 0 1.5px, transparent 1.5px 4.5px),
             repeating-linear-gradient(-52deg, rgba(255, 255, 255, .05) 0 1px, transparent 1px 7px),
             linear-gradient(165deg, #2a4fc4 0%, #3439a8 55%, #3d2a94 100%);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; overflow-x: clip; background: var(--page); color: var(--ink); font: 17px/1.62 var(--font); -webkit-font-smoothing: antialiased; overflow-wrap: break-word; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--link); text-underline-offset: 3px; }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; border-radius: 4px; }
[hidden] { display: none !important; }
h1, h2, h3 { margin: 0; font-family: var(--round); line-height: 1.12; letter-spacing: -0.015em; }
h2 { font-size: clamp(30px, 4.2vw, 44px); font-weight: 800; text-wrap: balance; }
h3 { font-size: 18.5px; font-weight: 700; letter-spacing: -0.005em; }
p { margin: 0; }
code, .mono { font-family: var(--mono); font-size: .92em; }
.num { font-variant-numeric: tabular-nums; }
.wrap { width: min(1140px, 100% - 32px); margin-inline: auto; }
.skip { position: absolute; left: -999px; top: 8px; padding: 8px 14px; background: var(--ink); color: var(--page); border-radius: 8px; z-index: 20; }
.skip:focus { left: 16px; }

/* ---------- Masthead ---------- */
.masthead { display: flex; align-items: center; gap: 8px 18px; padding-block: 18px; }
.wordmark { display: flex; align-items: center; gap: 10px; margin-right: auto; color: inherit; text-decoration: none; font-family: var(--round); font-weight: 750; font-size: 19px; letter-spacing: -0.01em; white-space: nowrap; }
.wordmark img { width: 32px; height: 32px; border-radius: 8px; }
.masthead > a:not(.wordmark, .tip) { color: var(--muted); text-decoration: none; font-size: 15px; }
.masthead > a:not(.wordmark, .tip):hover { color: var(--ink); }
.tip { display: inline-flex; align-items: center; gap: 8px; color: var(--muted); text-decoration: none; font-size: 15px; }
.tip:hover { color: var(--ink); }
.tip img { width: 24px; height: 24px; border-radius: 50%; }

.lang { position: relative; font-size: 15px; }
.lang summary { display: flex; align-items: center; gap: 6px; cursor: pointer; list-style: none; padding: 5px 11px; border: 1px solid var(--rule); border-radius: 999px; color: var(--ink); }
.lang summary::-webkit-details-marker { display: none; }
.lang summary svg { flex: none; }
.lang ul { position: absolute; right: 0; top: calc(100% + 6px); z-index: 10; min-width: 160px; margin: 0; padding: 6px; list-style: none; background: var(--page); border: 1px solid var(--rule); border-radius: 12px; box-shadow: var(--shadow); }
.lang li a { display: block; padding: 7px 11px; border-radius: 8px; color: var(--ink); text-decoration: none; }
.lang li a:hover { background: var(--sheet); }
.lang li a[aria-current] { font-weight: 700; }

/* ---------- Hero ---------- */
.hero { display: grid; grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr); gap: 56px; align-items: center; padding-block: 40px 24px; }
.hero h1 { font-size: clamp(40px, 5.6vw, 66px); font-weight: 850; letter-spacing: -0.03em; line-height: 1.04; text-wrap: balance; }
.lede { margin-top: 22px; font-size: 20px; color: var(--muted); max-width: 32em; }

/* The fragment bar: 48 pieces that light in a scattered order, the way a torrent fills in, then turn green. */
.frag { margin-top: 30px; max-width: 540px; }
.frag-cells { display: grid; grid-template-columns: repeat(48, minmax(0, 1fr)); gap: 3px; height: 10px; }
.frag-cells i { border-radius: 3px; background: var(--done); }
.frag-meta { display: flex; justify-content: space-between; gap: 12px; margin-top: 9px; font-size: 14px; color: var(--muted); font-family: var(--round); }
.frag-meta span:first-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.frag.run .frag-cells i { background: var(--cell); animation: lit .28s ease-out forwards, finish .5s ease-out forwards; animation-delay: var(--d), 3.15s; }
.frag.run .frag-meta b { color: var(--ink); }
@keyframes lit { to { background: var(--lit); } }
@keyframes finish { from { background: var(--lit); } to { background: var(--done); } }

.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px; margin-top: 32px; }
.btn { display: inline-flex; align-items: center; gap: 10px; min-height: 48px; padding: 10px 22px; border-radius: 999px; background: var(--blue); color: var(--on-blue); font-weight: 650; text-decoration: none; border: 0; font-size: 16.5px; }
.btn:hover { filter: brightness(1.08); }
.btn img { width: 22px; height: 22px; border-radius: 50%; }
.btn svg { flex: none; }
.btn.quiet { background: var(--sheet); color: var(--ink); }
.fine { margin-top: 18px; font-size: 14.5px; color: var(--muted); }

.swatch { position: relative; padding: 28px 0 28px 28px; border-radius: 28px; background: var(--hatch); }
.swatch picture, .swatch > img { display: block; }
.swatch img { width: 100%; border-radius: 16px 0 0 16px; box-shadow: var(--shadow); }
.hero .swatch { margin-right: calc((100vw - min(1140px, 100vw - 32px)) / -2); border-radius: 28px 0 0 28px; }

/* ---------- Sections ---------- */
.band { padding-block: 112px 0; }
.intro { max-width: 40em; }
.intro p { margin-top: 16px; font-size: 19px; color: var(--muted); }

/* Protocols: the schemes themselves, set as you would paste them */
.split { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); gap: 56px; align-items: start; margin-top: 44px; }
.schemes { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--rule); }
.schemes li { display: grid; grid-template-columns: 190px minmax(0, 1fr); gap: 4px 20px; padding: 16px 0; border-bottom: 1px solid var(--rule); }
.schemes code { font-size: 19px; font-weight: 600; color: var(--blue); }
.schemes code + code { margin-left: 10px; }
.schemes p { color: var(--muted); }
.schemes strong { display: block; color: var(--ink); font-weight: 650; }
.points { display: grid; gap: 22px; margin: 32px 0 0; padding: 0; list-style: none; }
.points p, .points li > span { color: var(--muted); }
.points h3 { margin-bottom: 4px; }
.shot-card img { border-radius: 24px; box-shadow: var(--shadow); }
.caption { margin-top: 14px; font-size: 14.5px; color: var(--muted); }

.compare { margin-top: 64px; max-width: 760px; }
.compare h3 { font-size: 22px; }
.table { overflow-x: auto; margin-top: 18px; }
table { width: 100%; border-collapse: collapse; font-size: 16px; }
th, td { padding: 11px 14px; text-align: left; border-bottom: 1px solid var(--rule); }
thead th { font-family: var(--round); font-size: 15px; color: var(--muted); font-weight: 650; }
tbody th { font-weight: 550; }
td { white-space: nowrap; }
td.yes { color: var(--ink); }
td.yes::before { content: ""; display: inline-block; width: 9px; height: 9px; margin-right: 9px; border-radius: 2px; background: var(--done); vertical-align: 1px; }
td.no { color: var(--muted); }
td.no::before { content: ""; display: inline-block; width: 9px; height: 9px; margin-right: 9px; border-radius: 2px; background: var(--cell); vertical-align: 1px; }
.compare .caption { max-width: 40em; }

/* Phones: three screens on the hatched swatch */
.phones { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(14px, 3vw, 36px); margin-top: 44px; padding: clamp(20px, 4vw, 48px); border-radius: 28px; background: var(--hatch); }
.phones figure { margin: 0; }
.phones img { border-radius: 26px; box-shadow: var(--shadow); }
.phones figcaption { margin-top: 14px; color: #fff; font-size: 15px; text-align: center; text-wrap: balance; }
.cols { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px 56px; margin: 44px 0 0; padding: 0; list-style: none; max-width: 980px; }
.cols p { margin-top: 5px; color: var(--muted); }

/* Chat: a plain conversation, no service branding */
.chat-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; align-items: start; margin-top: 44px; }
.chat { display: flex; flex-direction: column; gap: 10px; padding: 26px 22px; border-radius: 28px; background: var(--sheet); font-size: 15.5px; line-height: 1.45; }
.chat .day { align-self: center; font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.msg { max-width: 86%; padding: 9px 14px 10px; border-radius: 18px; background: var(--page); color: var(--ink); box-shadow: 0 1px 2px rgba(22, 26, 51, .08); }
.msg.me { align-self: flex-end; background: var(--blue); color: var(--on-blue); border-bottom-right-radius: 6px; }
.msg.bot { align-self: flex-start; border-bottom-left-radius: 6px; }
.msg code { font-size: 14px; word-break: break-all; }
.msg.me code { color: inherit; }
.msg ol { margin: 4px 0 0; padding-left: 20px; }
.msg small { display: block; color: var(--muted); font-size: 13px; }
.msg.note { border-left: 4px solid var(--done); }
.services { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px 28px; margin: 28px 0 0; padding: 0; list-style: none; }
.services li { padding-top: 12px; border-top: 1px solid var(--rule); }
.services b { display: block; }
.services span { color: var(--muted); font-size: 15px; }
.cmds { margin-top: 22px; color: var(--muted); }
.cmds code { color: var(--ink); white-space: nowrap; }
.dev { margin-top: 56px; padding: 30px 32px; border-radius: 24px; border: 1px solid var(--rule); display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 16px 32px; align-items: center; }
.dev p { margin-top: 6px; color: var(--muted); max-width: 46em; }

/* Everything else */
.more { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 34px 44px; margin: 48px 0 0; padding: 0; list-style: none; }
.more li { padding-top: 16px; border-top: 2px solid var(--ink); }
.more p { margin-top: 6px; color: var(--muted); }
.wide-shot { margin-top: 56px; }
.wide-shot img { border-radius: 20px; box-shadow: var(--shadow); border: 1px solid var(--rule); }

.facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px 44px; margin-top: 40px; }
.facts p { margin-top: 6px; color: var(--muted); }
.facts.two { grid-template-columns: repeat(2, minmax(0, 1fr)); max-width: 820px; }

/* ---------- Get started ---------- */
.start { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; align-items: start; margin-top: 44px; }
.steps { margin: 0; padding: 0; list-style: none; counter-reset: step; display: grid; gap: 28px; }
.steps li { position: relative; padding-left: 56px; counter-increment: step; }
.steps li::before { content: counter(step); position: absolute; left: 0; top: -2px; width: 38px; height: 38px; display: grid; place-items: center; border-radius: 50%; background: var(--hatch); color: #fff; font: 800 18px/1 var(--round); }
.steps p { margin-top: 5px; color: var(--muted); }
.release { padding: 28px; border-radius: 26px; background: var(--sheet); }
.release h3 { font-size: 22px; }
.rel-meta { margin-top: 4px; color: var(--muted); font-size: 15px; }
.arches { display: grid; grid-template-columns: minmax(0, 1fr); gap: 8px; margin: 20px 0 0; padding: 0; list-style: none; }
.arch { display: flex; align-items: center; justify-content: space-between; gap: 4px 16px; min-height: 56px; padding: 10px 16px; border-radius: 16px; background: var(--page); color: var(--ink); text-decoration: none; border: 1px solid var(--rule); }
.arch:hover { border-color: var(--blue); }
.arch b { display: flex; align-items: center; gap: 8px; font-weight: 650; }
.arch b svg { color: var(--blue); flex: none; }
.arch small { color: var(--muted); font-size: 14px; white-space: nowrap; }
.release details { margin-top: 18px; font-size: 15px; }
.release summary { cursor: pointer; color: var(--link); }
.notes { margin-top: 10px; max-height: 320px; overflow: auto; white-space: pre-wrap; font: 14px/1.55 var(--font); color: var(--muted); }
.sums { margin-top: 12px; font-size: 14.5px; color: var(--muted); }
.soon p { margin-top: 8px; color: var(--muted); }
.aside { margin-top: 22px; font-size: 15px; color: var(--muted); }
.aside + .aside { margin-top: 12px; }

/* ---------- Lawful use and tip jar ---------- */
.calm { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 40px 56px; }
.calm ul { margin: 14px 0 0; padding-left: 20px; color: var(--muted); }
.calm li + li { margin-top: 8px; }
.calm p { margin-top: 12px; color: var(--muted); }
.calm h2 { font-size: 26px; }
.tipjar { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 32px; align-items: center; padding: 40px 44px; border-radius: 28px; background: var(--sheet); }
.tipjar > img { width: 120px; height: 120px; border-radius: 28px; }
.tipjar h2 { font-size: clamp(26px, 3vw, 34px); }
.tipjar p { margin-top: 12px; color: var(--muted); max-width: 40em; }
.tipjar .actions { margin-top: 22px; }

/* ---------- Footer ---------- */
footer { margin-top: 120px; padding-block: 36px 56px; border-top: 1px solid var(--rule); font-size: 15px; color: var(--muted); }
.foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 18px 32px; }
.foot ul { display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 10px 0 0; padding: 0; list-style: none; }
.foot a { color: var(--muted); }
.foot a:hover { color: var(--ink); }
.tm { margin-top: 24px; font-size: 13.5px; }

/* ---------- Narrow screens ---------- */
@media (max-width: 980px) {
  .hero, .split, .chat-split, .start { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .hero .swatch { margin-right: -16px; }
  .more, .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split .shot-card { max-width: 520px; }
  .chat-split .shot-card { max-width: 520px; }
}
@media (max-width: 640px) {
  body { font-size: 16.5px; }
  .masthead { gap: 12px; }
  .masthead > a.src { display: none; }
  .wordmark { font-size: 17px; gap: 8px; }
  .wordmark img { width: 28px; height: 28px; }
  .tip span, .lang summary span { display: none; }
  .lang summary { padding: 7px 9px; }
  .hero .swatch { margin-right: 0; padding: 22px; border-radius: 24px; display: flex; justify-content: center; }
  .hero .swatch img { width: min(250px, 100%); border-radius: 22px; }
  .hero { padding-top: 16px; }
  .lede { font-size: 18px; }
  .band { padding-top: 80px; }
  .intro p { font-size: 17.5px; }
  .swatch { padding: 16px 0 16px 16px; border-radius: 20px 0 0 20px; }
  .swatch img { border-radius: 10px 0 0 10px; }
  .schemes li { grid-template-columns: minmax(0, 1fr); }
  .phones { grid-template-columns: repeat(3, 72%); overflow-x: auto; scroll-snap-type: x mandatory; margin-inline: -16px; border-radius: 0; padding: 20px 16px; }
  .phones figure { scroll-snap-align: center; }
  .cols, .more, .facts, .facts.two, .services, .calm { grid-template-columns: minmax(0, 1fr); }
  .dev { grid-template-columns: minmax(0, 1fr); padding: 24px; }
  .arches { grid-template-columns: minmax(0, 1fr); }
  .release { padding: 22px 18px; }
  .tipjar { grid-template-columns: minmax(0, 1fr); padding: 28px 22px; gap: 18px; }
  .tipjar > img { width: 88px; height: 88px; }
  td, th { padding: 10px 8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .frag.run .frag-cells i { animation: none; background: var(--done); }
}

/* CJK headlines: keep phrases together instead of breaking anywhere */
:lang(zh) h1, :lang(zh) h2 { word-break: keep-all; line-break: strict; }
:lang(zh) .hero h1 { font-size: clamp(36px, 5vw, 58px); line-height: 1.12; }
.nw { white-space: nowrap; }