*,*::before,*::after{box-sizing:border-box}
/* Palette (contract §四, 2026-09-20 21:1x "graphite stays"). The page is a
   graphite opening and a white sheet: the app's identity colour #3E424D on the
   hero, header and footer, the app's interaction blue #007AFF on everything
   clickable, and soft tints for the large tiles. The device mockups keep the
   app's own colours, sampled from its screenshots. */
:root{
  --night:#3e424d; --night-2:#4a4f5c; --paper:#fff; --page:#f5f5f9; --hair:#e6e7ee;
  --accent:#007aff; --accent-ink:#0069d9; --accent-soft:#e5f1ff;
  --lav:#e5f1ff; --butter:#fff3c6; --mint:#e0f5e9; --rose:#ffe7ec; --sky:#e3f1ff;
  /* Neutrals sit on the graphite's own hue; --muted is the lightest text
     colour and still clears 4.5:1 on --page. */
  --ink:#16181d; --body:#4a4f5e; --muted:#5f6472;
  /* Shadows on the white sheet lean graphite. */
  --shade:62,66,77;
  /* On graphite (#3E424D) white is 9.3:1, body 5.6:1, muted 4.6:1. */
  --on-dark:#fff; --on-dark-body:#d0d3da; --on-dark-muted:#b6bac4;
  /* Device-mockup colours, sampled from the app's own screenshots rather than
     guessed. See the phone mockup block for which screenshot each came from. */
  --wash:#f7f8fa; --slate:#3e424d; --cream:#f6f1e8; --lav-ink:#d4c9d4;
  --sent:#545863; --sent-ink:#fff; --sent-dim:#c2c5cd;
  --bar:#edeeef; --field:#fcfdff;
  --cl-search:#e8e8eb; --cl-badge:#bec1ca;
  --av-olive:#8c8e7b; --av-warm:#bdbeb2; --av-cool:#dfe3e6;
  --text:#0f1117;
  --doc:760px; --wide:1180px;
}
/* The header is sticky, so anchored jumps need to clear it. */
html{-webkit-text-size-adjust:100%;background:var(--night);scroll-behavior:smooth;
  scroll-padding-top:76px}
/* Inter for Latin text, self-hosted and variable-weight; everything outside
   its range (all CJK) falls through to the system stack behind it. swap, so
   text is never invisible while the 48 KB file arrives. */
@font-face{font-family:"Inter";font-style:normal;font-weight:400 800;font-display:swap;
  src:url(/assets/fonts/inter-latin.woff2) format("woff2");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,
    U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
body{
  margin:0;background:var(--night);color:var(--text);overflow-x:hidden;
  font:16px/1.7 "Inter",-apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",
    "PingFang SC","Hiragino Sans GB","Microsoft YaHei",Roboto,sans-serif;
  font-feature-settings:"cv11","ss01";
}
/* Everything between the header and the footer sits on white; the hero paints
   its own dark slab inside that. */
main{background:var(--paper)}
.skip{position:absolute;left:-9999px;top:0}
.skip:focus{left:12px;top:12px;z-index:20;background:var(--accent);color:var(--on-dark);
  padding:10px 16px;border-radius:10px;text-decoration:none}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
a{color:var(--accent-ink)}
img,svg{display:block;max-width:100%}

/* ---------- header ---------- */
/* The header is the one place the page uses glass, as the platform guidance
   has it: controls and navigation float on the material, content never does.
   Blur plus saturation keeps colour under the bar alive; a 1px top highlight
   and a darker horizontal edge separate it from whatever scrolls beneath. */
.site-head{position:sticky;top:0;z-index:15;background:rgba(11,12,16,.78);
  -webkit-backdrop-filter:blur(20px) saturate(180%);backdrop-filter:blur(20px) saturate(180%);
  border-bottom:1px solid rgba(255,255,255,.08);color:var(--on-dark);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.06);
  transition:background .35s ease,border-color .35s ease}
.bar{max-width:var(--wide);margin:0 auto;padding:13px 24px;
  display:flex;align-items:center;gap:14px;
  transition:margin .35s cubic-bezier(.2,.7,.2,1),padding .35s cubic-bezier(.2,.7,.2,1),
    border-radius .35s ease,background .35s ease,box-shadow .35s ease,max-width .35s ease}
/* Once the page scrolls the bar lets go of the edges and floats as a pill —
   the reference site's header. The strip behind goes transparent so the pill
   reads as an object over the page rather than a bar with rounded ends. */
.site-head.scrolled{background:transparent;border-color:transparent;
  -webkit-backdrop-filter:none;backdrop-filter:none}
.site-head.scrolled .bar{max-width:calc(var(--wide) - 48px);margin:10px auto;padding:8px 10px 8px 14px;
  border-radius:999px;background:rgba(15,17,23,.72);
  -webkit-backdrop-filter:blur(20px) saturate(180%);backdrop-filter:blur(20px) saturate(180%);
  box-shadow:0 22px 48px -22px rgba(0,0,0,.7),0 0 0 1px rgba(0,0,0,.45),
    inset 0 1px 0 rgba(255,255,255,.14),inset 0 -1px 0 rgba(255,255,255,.04)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:inherit;margin-right:auto}
/* The app's own icon, not a lookalike drawn in CSS. */
.mark{width:34px;height:34px;flex:0 0 auto;border-radius:9px}
.brand b{font-size:19px;font-weight:700;letter-spacing:-.4px}
nav.top{display:flex;gap:2px;flex-wrap:wrap}
nav.top a{padding:7px 13px;border-radius:999px;font-size:14.5px;text-decoration:none;color:var(--on-dark-body)}
nav.top a:hover{color:var(--on-dark);background:rgba(255,255,255,.08)}
nav.top a[aria-current]{color:var(--on-dark);background:rgba(255,255,255,.12);font-weight:620}
.lang{font-size:13.5px;color:var(--on-dark-body);text-decoration:none;padding:6px 12px;
  border:1px solid rgba(255,255,255,.18);border-radius:999px;white-space:nowrap}
.lang:hover{color:var(--on-dark);border-color:rgba(255,255,255,.45)}
.cta{background:var(--accent);color:var(--on-dark);text-decoration:none;font-weight:650;
  font-size:14.5px;padding:9px 18px;border-radius:999px;white-space:nowrap}
.cta:hover{background:var(--accent-ink)}
/* The phone menu: hidden until the narrow breakpoint, then a three-line
   button that drops a panel of the same links. No script involved. */
.menu{display:none;position:relative}
.menu summary{list-style:none;width:40px;height:40px;border-radius:50%;display:grid;place-items:center;
  gap:0;cursor:pointer;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12)}
.menu summary::-webkit-details-marker{display:none}
.menu summary span{display:block;width:18px;height:2px;background:var(--on-dark);border-radius:2px;
  margin:2px 0}
.menu[open] summary{background:rgba(255,255,255,.18)}
.menu nav{position:absolute;right:0;top:48px;min-width:200px;padding:8px;border-radius:18px;
  background:rgba(15,17,23,.86);border:1px solid rgba(255,255,255,.1);
  -webkit-backdrop-filter:blur(20px) saturate(180%);backdrop-filter:blur(20px) saturate(180%);
  box-shadow:0 24px 50px -20px rgba(0,0,0,.7),inset 0 1px 0 rgba(255,255,255,.12);display:flex;flex-direction:column}
.menu nav a{padding:11px 14px;border-radius:12px;color:var(--on-dark-body);text-decoration:none;font-size:15px}
.menu nav a:hover,.menu nav a[aria-current]{background:rgba(255,255,255,.1);color:var(--on-dark)}

/* ---------- shared section machinery ---------- */
.inner{max-width:var(--wide);margin:0 auto;padding:104px 24px}
.band.alt{background:var(--page)}
.center{text-align:center}
.center-col{display:flex;flex-direction:column;align-items:center}
.btns{display:flex;flex-wrap:wrap;gap:12px;margin:30px 0 0}
.btns.center{justify-content:center}
.dlnote{margin:22px 0 0;font-size:14px;color:var(--on-dark-muted)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 22px;border-radius:999px;font-weight:650;font-size:15px;
  text-decoration:none;border:1px solid transparent;transition:transform .15s ease,background .15s ease}
.btn:hover{transform:translateY(-1px)}
.btn-lg{padding:17px 32px;font-size:17px}
.btn-lg.go::after{content:"\2192";font-weight:500}
.btn-accent,.btn-primary{background:var(--accent);color:var(--on-dark);
  box-shadow:0 16px 34px -16px rgba(0,122,255,.55)}
.btn-accent:hover,.btn-primary:hover{background:var(--accent-ink)}
.btn-ghost{background:var(--paper);color:var(--ink);border-color:var(--hair)}
.btn-ghost:hover{border-color:var(--muted)}
.arrow{font-weight:650;text-decoration:none;font-size:15.5px}
.arrow::after{content:" \2192"}
.arrow:hover{text-decoration:underline}
h2.sec{font-size:clamp(32px,4.4vw,58px);line-height:1.04;letter-spacing:-2px;
  margin:0 0 20px;font-weight:700;color:var(--ink)}
p.body{font-size:18px;line-height:1.68;color:var(--body);margin:0 0 16px;max-width:50ch}
p.body.center{margin-left:auto;margin-right:auto}
.lede{font-size:19px;line-height:1.65;color:var(--body);margin:0;max-width:60ch}
.lede.center{margin-left:auto;margin-right:auto}

/* ---------- hero ---------- */
/* Dark opening, two columns on wide screens: copy on the left, the fan of
   store cards on the right, the reference site's split (2026-09-20 04:4x).
   Sticky and exactly one viewport tall, so the white sheet slides over it;
   the fan is sized from the viewport height (--card) so the whole opening
   always fits in one screen — a taller-than-window sticky box pinned the
   headline and hid the cards (W11). A glow follows the pointer (--mx/--my,
   set by the script); without the script it sits on the right. */
.hero{position:sticky;top:var(--head);background:var(--night);color:var(--on-dark);padding:0 24px;
  overflow:hidden;min-height:calc(100svh - var(--head));display:flex;flex-direction:column;justify-content:center;
  --head:69px;--card:clamp(200px,calc((100svh - 300px) * .46),300px)}
.hero::before{content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(55% 45% at 50% 0%,rgba(255,255,255,.10),transparent 70%),
    radial-gradient(30% 30% at 12% 40%,rgba(64,170,220,.12),transparent 70%)}
.hero::after{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(460px circle at var(--mx,74%) var(--my,46%),
    rgba(0,122,255,.55),rgba(0,122,255,.22) 40%,transparent 72%);
  filter:blur(10px)}
.hero .inner{position:relative;z-index:1;max-width:var(--wide);margin:0 auto;padding:56px 8px 40px;width:100%;
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,560px);gap:72px;align-items:center;text-align:left}
.hero .hero-copy{align-items:flex-start}
/* Side by side with the cards the headline has half the width: two lines at
   ~64px, not 96. */
.hero .display{font-size:clamp(40px,5vw,72px)}
.hero .sub{margin:0}
.hero .btns.center{justify-content:flex-start}
.hero-short .inner{padding:72px 8px 72px}
.hero-copy{max-width:820px;display:flex;flex-direction:column;align-items:center}
.eyebrow{margin:0 0 22px;font-size:12.5px;font-weight:650;letter-spacing:1.6px;
  text-transform:uppercase;color:var(--on-dark-muted)}
/* 700, not 600: on a dark ground a heavier cut holds its edge, and Segoe UI,
   SF and PingFang all ship real 700 glyphs. Keep each line of the headline
   under ~13 characters; shorten the words before reducing the size. */
.display{font-size:clamp(46px,7.6vw,96px);line-height:.98;letter-spacing:-3px;
  font-weight:700;margin:0 0 26px}
.sub{font-size:19px;line-height:1.62;color:var(--on-dark-body);margin:0 auto;max-width:46ch}
.sub.center{margin:0 auto}
.hero .btn-ghost{background:rgba(255,255,255,.1);color:var(--on-dark);border-color:rgba(255,255,255,.14);
  -webkit-backdrop-filter:blur(12px) saturate(180%);backdrop-filter:blur(12px) saturate(180%);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.18)}
.hero .btn-ghost:hover{background:rgba(255,255,255,.16);border-color:rgba(255,255,255,.3)}
/* Round platform marks under the buttons, as the reference draws them. */
.plats{display:flex;gap:12px;margin:22px 0 0}
.plat{width:52px;height:52px;border-radius:50%;display:grid;place-items:center;color:var(--on-dark);
  background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.12);
  transition:background .15s ease,transform .15s ease}
.plat:hover{background:rgba(255,255,255,.2);transform:translateY(-1px)}
.plat .i{width:24px;height:24px}
/* Chinese has no ascender/descender slack and no word spaces, so the tight
   tracking and tight leading that flatter the English display type make it
   cramped and unreadable. */
html[lang="zh-Hans"] .display{letter-spacing:0;line-height:1.14}
html[lang="zh-Hans"] h2.sec{letter-spacing:0;line-height:1.24}
html[lang="zh-Hans"] p.body,html[lang="zh-Hans"] .sub,html[lang="zh-Hans"] .lede{line-height:1.8}

/* The white sheet the rest of the page rides on. It starts where the hero
   ends; the rounded corners show the dark opening behind them. */
.sheet{position:relative;z-index:2;background:var(--paper);
  border-radius:44px 44px 0 0;padding-top:56px}

/* ---------- store-card fan ---------- */
/* The five App Store screenshots, 660x1434 each, shown at half size. The
   centre card stands upright and nearest; each step outward is set back,
   scaled down and tilted, the reference site's arrangement. The box is sized
   to the centre card; the wings overhang it and are clipped by the hero's
   edges, which is fine — the outer cards are meant to run off, and the lower
   ends disappear behind the sheet. Positions are classes s0–s4, which the
   script rotates; the transform transition is what makes a card glide from
   one seat to the next. */
.fanwrap{display:flex;flex-direction:column;align-items:center;margin-top:0;min-width:0}
/* Carousel controls: previous / next and one dot per card, the current one
   stretched. Hidden until the script is running, since they need it. */
.fanctl{display:none;align-items:center;justify-content:center;gap:16px;margin:0 0 6px}
html.js .fanctl{display:flex}
.fanbtn{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;cursor:pointer;
  background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.14);color:var(--on-dark);
  -webkit-backdrop-filter:blur(12px) saturate(180%);backdrop-filter:blur(12px) saturate(180%);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.18);
  transition:background .15s ease}
.fanbtn:hover{background:rgba(255,255,255,.2)}
.fanbtn svg{width:20px;height:20px}
.dots{display:flex;align-items:center;gap:8px}
.dot{width:8px;height:8px;border-radius:4px;border:0;padding:0;cursor:pointer;
  background:rgba(255,255,255,.3);transition:width .3s ease,background .3s ease}
.dot:hover{background:rgba(255,255,255,.55)}
.dot[aria-selected="true"]{width:24px;background:var(--on-dark)}
.fan:focus-visible{outline:2px solid var(--accent);outline-offset:6px;border-radius:40px}
.fan{position:relative;z-index:3;width:var(--card,330px);height:calc(var(--card,330px) * 717 / 330);margin:16px auto 0;flex:0 0 auto}
.shot{position:absolute;left:0;bottom:0;width:var(--card,330px);height:auto;border-radius:32px;
  transform-origin:50% 100%;cursor:pointer;
  transition:transform .75s cubic-bezier(.2,.7,.2,1),opacity .5s ease,box-shadow .4s ease;
  box-shadow:0 44px 90px -34px rgba(0,0,0,.75),0 0 0 1px rgba(255,255,255,.06)}
.shot:hover{box-shadow:0 54px 100px -34px rgba(0,0,0,.85),0 0 0 1px rgba(255,255,255,.14)}
.s2{z-index:5}
/* Three seats show in the column; s0 / s4 are the parked positions the
   rotation passes through, kept invisible so nothing is half-cut. */
.s1{z-index:4;transform:translateX(calc(var(--card,330px) * -.6)) translateY(24px) rotate(-6deg) scale(.9)}
.s3{z-index:4;transform:translateX(calc(var(--card,330px) * .6)) translateY(24px) rotate(6deg) scale(.9)}
.s0{z-index:3;opacity:0;pointer-events:none;transform:translateX(calc(var(--card,330px) * -1.2)) translateY(56px) rotate(-12deg) scale(.8)}
.s4{z-index:3;opacity:0;pointer-events:none;transform:translateX(calc(var(--card,330px) * 1.2)) translateY(56px) rotate(12deg) scale(.8)}

/* ---------- motion ---------- */
/* The opening rises into place on load; cards further down fade up as they
   scroll into view (the script adds .in). Hidden starting state is gated on
   html.js so without the script nothing is ever invisible. */
@keyframes rise{from{opacity:0;transform:translateY(22px)}to{opacity:1;transform:none}}
.hero-copy>*{animation:rise .7s cubic-bezier(.2,.7,.2,1) both}
.hero-copy>:nth-child(2){animation-delay:.06s}
.hero-copy>:nth-child(3){animation-delay:.12s}
.hero-copy>:nth-child(4){animation-delay:.18s}
.hero-copy>:nth-child(5){animation-delay:.24s}
.hero-copy>:nth-child(6){animation-delay:.3s}
.fanwrap{animation:rise .9s .26s cubic-bezier(.2,.7,.2,1) both}
html.js .rv{opacity:0;transform:translateY(26px);
  transition:opacity .6s ease,transform .7s cubic-bezier(.2,.7,.2,1)}
html.js .rv.in{opacity:1;transform:none}
.rv:nth-child(2){transition-delay:.06s}
.rv:nth-child(3){transition-delay:.12s}
.rv:nth-child(4){transition-delay:.18s}
.rv:nth-child(5){transition-delay:.24s}
.rv:nth-child(6){transition-delay:.3s}
html.js .fcard.in,html.js .dlcard.in{transition:transform .25s ease,box-shadow .25s ease}
html.js .fcard.in:hover,html.js .dlcard.in:hover{transform:translateY(-4px);box-shadow:0 24px 50px -30px rgba(var(--shade),.45)}

/* ---------- stack tile ---------- */
.tile.sky{background:var(--sky)}
.layers{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}
.layers li{display:flex;gap:14px;align-items:flex-start;background:rgba(255,255,255,.72);
  border-radius:20px;padding:14px 16px}
.lico{width:38px;height:38px;border-radius:12px;flex:0 0 auto;display:grid;place-items:center;
  background:var(--paper);color:var(--accent);box-shadow:0 6px 16px -12px rgba(var(--shade),.4)}
.lico .i{width:19px;height:19px}
.ltx{display:flex;flex-direction:column;gap:2px;min-width:0}
.ltx b{font-size:15px;font-weight:680;color:var(--ink);letter-spacing:-.2px}
.ltx span{font-size:13.8px;line-height:1.55;color:var(--body)}

/* ---------- download page ---------- */
.dlgrid{display:grid;gap:18px;grid-template-columns:repeat(4,1fr);align-items:start}
.dlcard{background:var(--page);border-radius:28px;padding:28px 26px 22px;border:2px solid transparent;min-width:0}
.dlcard.on{border-color:var(--accent);background:var(--accent-soft)}
.dlcard h2{margin:0 0 14px;font-size:24px;font-weight:700;letter-spacing:-.6px;color:var(--ink)}
.dlrows{list-style:none;margin:0;padding:0;border-top:1px solid var(--hair)}
.dlrows li{border-bottom:1px solid var(--hair)}
.dlrows a{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 2px;
  color:var(--ink);text-decoration:none}
.dlrows a:hover b{text-decoration:underline}
.dlrows .rl{display:flex;flex-direction:column;gap:2px;min-width:0}
.dlrows b{font-size:16px;font-weight:650}
.dlrows small{font-size:12.5px;color:var(--muted)}
.dlrows .i{width:20px;height:20px;flex:0 0 auto;color:var(--accent-ink)}
.dlcard .pnote{margin:14px 0 0;font-size:13px;line-height:1.55;color:var(--muted)}
.sha{margin:10px 0 0;font-size:12px;line-height:1.5;color:var(--muted);word-break:break-all}
.sha code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.dlfoot{margin:36px auto 0;max-width:72ch;text-align:center;font-size:14.5px;line-height:1.65;color:var(--body)}
.plinks{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.plinks a{display:inline-block;padding:9px 16px;border-radius:999px;background:var(--paper);
  border:1px solid var(--hair);color:var(--ink);text-decoration:none;font-weight:650;font-size:14px}
.plinks a:hover{border-color:var(--accent)}

/* ---------- trust strip ---------- */
.strip .inner{padding:0 24px 8px;display:grid;gap:16px;grid-template-columns:repeat(4,1fr)}
.strip .inner>div{display:flex;gap:14px;align-items:flex-start;background:var(--page);
  border-radius:22px;padding:18px 20px}
.strip .ico{width:42px;height:42px;border-radius:13px;flex:0 0 auto;display:grid;place-items:center;
  background:var(--accent-soft);color:var(--accent)}
.strip .ico .i{width:21px;height:21px}
.strip .tx{display:flex;flex-direction:column;gap:2px;min-width:0}
.strip b{display:block;font-size:15px;font-weight:660;letter-spacing:-.2px;color:var(--ink)}
.strip .tx span{font-size:13px;color:var(--muted);line-height:1.45}

/* ---------- tiles ---------- */
/* Four large tinted cards, two of them full width. Each carries one claim and
   the object that proves it — the reference site's card idiom, applied to our
   own material. */
.tiles{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:56px}
.tile{border-radius:34px;padding:46px;display:flex;flex-direction:column;gap:30px;min-width:0}
.tile.wide{grid-column:1/-1;display:grid;grid-template-columns:.92fr 1.08fr;align-items:center;gap:48px}
.tile.lav{background:var(--lav)}
.tile.butter{background:var(--butter)}
.tile.mint{background:var(--mint)}
.tile.rose{background:var(--rose)}
.tile h3{font-size:clamp(26px,2.7vw,38px);line-height:1.08;letter-spacing:-1.2px;
  margin:0 0 16px;font-weight:700;color:var(--ink)}
.tile p{font-size:16.5px;line-height:1.66;color:var(--body);margin:0 0 12px;max-width:52ch}
.tile .tech{font-size:13px;color:var(--muted);letter-spacing:.3px;font-weight:600}
.tile .arrow{color:var(--accent-ink)}
.tile-copy{min-width:0}

/* The device-to-device diagram in the encryption tile. */
.flow{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:10px;align-items:stretch;min-width:0}
.node{background:rgba(255,255,255,.62);border-radius:24px;padding:14px 12px 14px;text-align:center;
  display:flex;flex-direction:column;min-width:0}
.nlab{display:block;font-size:13px;font-weight:660;color:var(--ink);margin-bottom:10px}
.mini{flex:1;background:var(--paper);border-radius:18px;padding:12px 10px;display:flex;flex-direction:column;
  gap:6px;min-height:124px;justify-content:center;
  box-shadow:0 10px 24px -18px rgba(var(--shade),.35)}
.mb{font-size:12px;line-height:1.35;padding:6px 9px;border-radius:12px;max-width:88%;text-align:left}
.mb.in{background:#eef0f4;color:var(--ink);align-self:flex-start}
.mb.out{background:var(--sent);color:var(--sent-ink);align-self:flex-end}
.mini.cipher{align-items:center;gap:8px}
.mini.cipher .i{width:26px;height:26px;color:var(--accent)}
.mini.cipher code{font:600 12px/1.45 ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--body);
  word-break:break-all;letter-spacing:.3px}
.mini.cipher small{font-size:12px;color:var(--muted)}
.farrow{align-self:center;color:var(--muted);font-size:22px;line-height:1}

/* ---------- illustration cards ---------- */
.art{display:grid;place-items:center}
.artcard{width:100%;background:var(--paper);border-radius:28px;padding:30px 30px 26px;
  box-shadow:0 26px 60px -34px rgba(var(--shade),.35)}
.band.alt .artcard{border:1px solid var(--hair)}
.artcard h3,.artcard h4{margin:0;font-size:12px;font-weight:660;letter-spacing:1.2px;
  text-transform:uppercase;color:var(--muted)}
.handle{font-size:44px;font-weight:700;letter-spacing:-1.8px;margin:14px 0 2px;color:var(--ink)}
.bignum{font-size:92px;font-weight:700;letter-spacing:-4.5px;margin:12px 0 0;
  line-height:.9;color:var(--accent)}
.artnote{font-size:14px;color:var(--muted);margin:8px 0 18px}
.pill{display:inline-flex;align-items:center;gap:8px;background:var(--page);
  border:1px solid var(--hair);border-radius:999px;padding:8px 15px;
  font-size:13px;color:var(--body);font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.chks{margin-top:18px;border-top:1px solid var(--hair)}
.chk{display:flex;align-items:flex-start;gap:11px;padding:11px 0;
  border-bottom:1px solid var(--hair);font-size:14px;color:var(--body)}
.chk:last-child{border-bottom:0}
.chk .i{width:19px;height:19px;flex:0 0 auto;color:var(--accent);margin-top:2px}
.sn{display:grid;grid-template-columns:repeat(3,1fr);gap:11px 16px;margin:20px 0 22px;
  font:600 19px/1.3 ui-monospace,SFMono-Regular,Menlo,monospace;
  letter-spacing:.6px;color:var(--ink);text-align:center}
.verified{display:flex;align-items:center;gap:9px;font-size:14px;color:var(--body);
  border-top:1px solid var(--hair);padding-top:14px}
.verified .i{width:19px;height:19px;color:var(--accent);flex:0 0 auto}

/* ---------- comparison ---------- */
.cmp{margin-top:44px;border-radius:28px;background:var(--paper);border:1px solid var(--hair);overflow:hidden}
.cmp table{width:100%;border-collapse:collapse;font-size:16px}
.cmp th,.cmp td{padding:18px 26px;text-align:left;border-bottom:1px solid var(--hair);vertical-align:middle}
.cmp tbody tr:last-child td{border-bottom:0}
.cmp th{font-size:12.5px;text-transform:uppercase;letter-spacing:.9px;color:var(--muted);
  font-weight:660;background:var(--page)}
.cmp th.us{color:var(--accent-ink)}
.cmp td:first-child{font-weight:650;color:var(--ink)}
.cmp td.no{color:var(--muted)}
.cmp td.us{color:var(--ink);font-weight:650;white-space:nowrap}
.cmp td.us .i{width:18px;height:18px;color:var(--accent);display:inline-block;vertical-align:-4px;margin-right:9px}

/* ---------- feature grid ---------- */
/* Fixed at three columns rather than auto-fit: there are six cards, and letting
   them flow into four would leave an orphan row of two. */
.fgrid{display:grid;gap:18px;grid-template-columns:repeat(3,1fr);margin-top:52px}
.fgrid.four{grid-template-columns:repeat(4,1fr)}
.fcard{background:var(--page);border-radius:26px;padding:28px}
.fcard .ico{width:46px;height:46px;border-radius:15px;display:grid;place-items:center;
  background:var(--paper);color:var(--accent);margin-bottom:18px;
  box-shadow:0 8px 20px -14px rgba(var(--shade),.4)}
.fcard .ico .i{width:22px;height:22px}
.fcard h3{margin:0 0 8px;font-size:18px;font-weight:680;letter-spacing:-.3px;color:var(--ink)}
.fcard p{margin:0;font-size:15px;line-height:1.62;color:var(--body)}

/* ---------- platform grid ---------- */
.pgrid{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(266px,1fr));margin-top:48px}
.pcard{background:var(--paper);border:1px solid var(--hair);border-radius:28px;padding:30px}
.pcard.ready{border-color:transparent;box-shadow:0 22px 50px -34px rgba(var(--shade),.45)}
.pico{width:54px;height:54px;border-radius:17px;display:grid;place-items:center;
  background:var(--accent-soft);color:var(--accent-ink);margin-bottom:18px}
.pico .i{width:26px;height:26px}
.pcard h3{margin:0 0 4px;font-size:22px;font-weight:700;letter-spacing:-.5px;color:var(--ink)}
.pnote{margin:0 0 16px;font-size:13px;color:var(--muted)}
.pcard p{color:var(--body);font-size:14.8px}
.pcard p:last-child{margin-bottom:0}
/* The cards are ~270px wide at three across; the full-size button wraps there. */
.pcard .btn{padding:12px 18px;font-size:14.5px;text-align:center}

/* Closing panel: the dark slab again, so the page ends the way it opened. */
.closer{max-width:var(--wide);margin:0 auto;padding:0 24px 40px}
.closer .inner{max-width:none;margin:0;border-radius:36px;padding:92px 52px 96px;
  color:var(--on-dark);position:relative;overflow:hidden;
  background:
    radial-gradient(70% 90% at 80% 10%,rgba(0,122,255,.40),transparent 62%),
    radial-gradient(60% 80% at 15% 90%,rgba(64,170,220,.35),transparent 60%),
    linear-gradient(150deg,#4a4f5c 0%,#3e424d 55%,#2c2f38 100%)}
.closer h2.sec{color:var(--on-dark)}
/* Three short clauses split by full stops: break only there, never inside
   a word ("一个用户 / 名。" on a phone). Each clause fits any width we serve. */
html[lang="zh-Hans"] .closer h2.sec{word-break:keep-all;overflow-wrap:normal}
.closer .lede{color:rgba(255,255,255,.82)}
.closer .btn-accent{background:var(--paper);color:var(--accent-ink);box-shadow:0 18px 40px -18px rgba(0,0,0,.5)}
.closer .btn-accent:hover{background:#f1f1ff}
.closer .btn-ghost{background:rgba(255,255,255,.1);color:var(--on-dark);border-color:rgba(255,255,255,.16);
  -webkit-backdrop-filter:blur(12px) saturate(180%);backdrop-filter:blur(12px) saturate(180%);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.18)}
.closer .btn-ghost:hover{background:rgba(255,255,255,.18);border-color:rgba(255,255,255,.4)}

/* ---------- document pages ---------- */
.doc{max-width:var(--doc);margin:0 auto;padding:48px 24px 88px}
.doc h1{font-size:clamp(30px,4.2vw,42px);line-height:1.16;letter-spacing:-1.3px;
  margin:0 0 14px;font-weight:700;color:var(--ink)}
.doc h2{font-size:19.5px;letter-spacing:-.3px;margin:38px 0 9px;font-weight:650;color:var(--ink)}
/* On the combined legal page the two documents' own headings sit one level
   down; the demoted title keeps a title's size, its sections a section's. */
.doc hr+h2,.doc hr~h2{font-size:clamp(26px,3.4vw,34px);letter-spacing:-1px;margin:8px 0 14px;font-weight:700}
.doc h3{font-size:19.5px;letter-spacing:-.3px;margin:38px 0 9px;font-weight:650;color:var(--ink)}
.doc p,.doc li,.doc td{color:var(--body)}
.doc .lede{font-size:18px;line-height:1.68;color:var(--body);margin:0 0 8px}
.doc .meta{font-size:13px;color:var(--muted);margin:0 0 8px}
.doc .muted{color:var(--muted);font-size:14px}
.doc ul,.doc ol{padding-left:23px;margin:11px 0}
.doc li{margin:7px 0}
.doc hr{border:0;border-top:1px solid var(--hair);margin:48px 0}
.doc .grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(258px,1fr));margin:24px 0}
.doc .card{background:var(--page);border:1px solid var(--hair);border-radius:18px;padding:22px}
.doc .card h2{margin:0 0 7px;font-size:17px;color:var(--accent-ink);font-weight:650}
.doc .card p{margin:0 0 9px}
.doc .card p:last-child{margin-bottom:0}
.doc table{width:100%;border-collapse:collapse;margin:20px 0;font-size:15px}
.doc th,.doc td{text-align:left;padding:12px 12px;border-bottom:1px solid var(--hair);vertical-align:top}
.doc th{color:var(--muted);font-weight:640;font-size:12.5px;text-transform:uppercase;letter-spacing:.5px}
.doc .btns{margin:26px 0 0}

/* Download page: the split sections it still uses. */
.split{display:grid;grid-template-columns:1.02fr .98fr;gap:60px;align-items:center}
.split.rev .art{order:-1}
.split .artcard{max-width:430px;border:1px solid var(--hair)}

/* ---------- footer ---------- */
.site-foot{background:var(--night);color:var(--on-dark-body)}
.foot-inner{max-width:var(--wide);margin:0 auto;padding:68px 24px 44px}
.foot-top{display:grid;grid-template-columns:1.1fr 2fr;gap:48px;align-items:start}
.foot-brand{display:flex;flex-direction:column;align-items:flex-start;gap:14px;max-width:38ch}
.foot-brand .brand{color:var(--on-dark);margin:0}
.foot-brand p{margin:0;font-size:14.5px;line-height:1.6;color:var(--on-dark-muted)}
.foot-plats{display:flex;gap:10px}
.foot-plats .plat{width:44px;height:44px}
.foot-plats .plat .i{width:20px;height:20px}
.cols{display:grid;gap:26px;grid-template-columns:repeat(5,1fr)}
.cols h2{font-size:12px;color:var(--on-dark);margin:0 0 12px;font-weight:660;
  text-transform:uppercase;letter-spacing:.9px}
.cols ul{list-style:none;padding:0;margin:0}
.cols li{margin:7px 0;font-size:14.2px}
.cols a{color:var(--on-dark-body);text-decoration:none}
.cols a:hover{color:var(--on-dark);text-decoration:underline}
.fine{color:var(--on-dark-muted);font-size:13px;margin:44px 0 0;padding-top:24px;
  border-top:1px solid rgba(255,255,255,.08)}
.fine a{color:var(--on-dark-muted)}

/* ---------- responsive ---------- */
/* A window too short for copy + fan side by side: let the opening scroll
   like any other section rather than pin and hide its lower half. */
@media(max-height:640px){
  .hero{position:relative;min-height:0}
}
@media(max-width:1000px){
  /* One column again: copy centred, the fan under it, the opening scrolls. */
  .hero{position:relative;top:auto;min-height:0;--card:300px}
  .hero .inner{display:flex;flex-direction:column;align-items:center;text-align:center;padding:72px 8px 0}
  .hero .hero-copy{align-items:center}
  .hero .display{font-size:clamp(44px,7.6vw,80px)}
  .hero .sub{margin:0 auto}
  .hero .btns.center{justify-content:center}
  .fanwrap{margin-top:40px}
  .s0,.s4{display:none}
  .sheet{padding-top:48px}
  .dlgrid{grid-template-columns:repeat(2,1fr)}
  .strip .inner{grid-template-columns:repeat(2,1fr)}
  .tiles{grid-template-columns:1fr}
  .tile.wide{grid-template-columns:1fr;gap:30px}
  .split{grid-template-columns:1fr;gap:34px}
  .split.rev .art{order:0}
  .fgrid,.fgrid.four{grid-template-columns:repeat(2,1fr)}
  .inner{padding:72px 24px}
  .foot-top{grid-template-columns:1fr;gap:36px}
  .cols{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:720px){
  .bar{gap:8px;padding:10px 14px}
  .brand{margin-right:auto}
  /* The row of links and the language pill move into the menu. */
  nav.top,.lang{display:none}
  .menu{display:block}
  .cta{padding:9px 14px;font-size:14px}
  .inner{padding:56px 18px}
  .hero{padding:0 14px}
  .hero .inner{padding:44px 4px 0}
  .hero-short .inner{padding:44px 4px 44px}
  .display{letter-spacing:-1.8px}
  .sub{font-size:17px}
  .btns{width:100%;flex-direction:column;align-items:stretch}
  .btns .btn{width:100%}
  /* On a phone the fan becomes a swipeable row: every card upright, snapping
     to centre, the way the store itself shows them. */
  /* Phone: no sticky stage. Copy, then the swipe strip, then the sheet. */
  .hero{overflow:visible;position:relative;min-height:0;display:block;justify-content:normal}
  .hero::after{display:none}
  .site-head.scrolled .bar{margin:8px 10px;padding:8px 10px;border-radius:30px}
  .fanwrap{align-self:stretch;margin-top:32px}
  .fan{width:auto;align-self:stretch;height:auto;margin:16px -18px 0;display:flex;gap:14px;overflow-x:auto;
    padding:0 calc(50vw - 130px) 40px;scroll-snap-type:x mandatory;scrollbar-width:none;
    -webkit-overflow-scrolling:touch}
  .fan::-webkit-scrollbar{display:none}
  .shot,.s0,.s1,.s2,.s3,.s4{position:static;display:block;flex:0 0 auto;width:260px;transform:none;
    opacity:1;pointer-events:auto;
    scroll-snap-align:center;border-radius:28px;box-shadow:0 24px 50px -24px rgba(0,0,0,.7)}
  .sheet{padding-top:36px;border-radius:30px 30px 0 0}
  .dlgrid{grid-template-columns:1fr}
  .layers li{padding:12px 14px}
  .strip .inner{grid-template-columns:1fr;gap:10px}
  .tile{padding:28px 24px;border-radius:26px;gap:24px}
  .tile.wide{gap:24px}
  .flow{grid-template-columns:1fr}
  .farrow{transform:rotate(90deg);justify-self:center}
  .fgrid,.fgrid.four{grid-template-columns:1fr}
  .cmp th,.cmp td{padding:13px 14px;font-size:14px}
  .cmp td.us{white-space:normal}
  .closer{padding:0 14px 30px}
  .closer .inner{padding:60px 22px 64px;border-radius:26px}
  .doc{padding:36px 18px 64px}
  .foot-inner{padding:52px 18px 38px}
  .cols{grid-template-columns:1fr 1fr;gap:20px}
  /* Same rhythm (31px per row), but the tappable box grows from 17px to 27px. */
  .cols li{margin:2px 0}
  .cols a{display:inline-block;padding:5px 0}
  .bignum{font-size:64px}
  .sn{font-size:14.5px;gap:8px 10px}
}
@media(max-width:400px){
  .hero .inner{padding:36px 2px 0}
  .shot,.s0,.s1,.s2,.s3,.s4{width:232px}
  .fan{padding:0 calc(50vw - 116px) 36px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .btn,.plat{transition:none}
}
/* Reduce Transparency on: every glass surface goes solid, as the platform does. */
@media(prefers-reduced-transparency:reduce){
  .site-head,.site-head.scrolled .bar,.menu nav,.hero .btn-ghost,.closer .btn-ghost,.fanbtn{
    -webkit-backdrop-filter:none;backdrop-filter:none}
  .site-head{background:rgba(11,12,16,.98)}
  .site-head.scrolled .bar,.menu nav{background:rgba(15,17,23,.98)}
  .hero .btn-ghost,.closer .btn-ghost,.fanbtn{background:rgba(255,255,255,.16)}
}