:root {
  --c-bg: #ffffff;
  --c-panel: #f4f5fe;
  --c-panel-2: #fafafc;
  --c-panel-deep: #e9ebfc;
  --c-border: #e4e6ef;
  --c-accent: #5664f5;
  --c-accent-dark: #3c48d6;
  --c-text: #1b1c22;
  --c-muted: #5d6072;
  --c-success: #1f9d6b;
  --c-warn: #c98a12;
  --c-error: #d6453d;
  --c-on-accent: #ffffff;
  --a-00: rgba(86, 100, 245, 0);
  --a-06: rgba(86, 100, 245, .06);
  --a-10: rgba(86, 100, 245, .10);
  --a-14: rgba(86, 100, 245, .14);
  --a-18: rgba(86, 100, 245, .18);
  --a-26: rgba(86, 100, 245, .26);
  --a-40: rgba(86, 100, 245, .40);
  --ink-04: rgba(27, 28, 34, .04);
  --ink-06: rgba(27, 28, 34, .06);
  --ink-veil: rgba(27, 28, 34, .24);
  --white-18: rgba(255, 255, 255, .18);
  --deep-38: rgba(60, 72, 214, .38);
  --deep-55: rgba(60, 72, 214, .55);
  --deep-60: rgba(60, 72, 214, .60);
  --font-display: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --size-body: 18px;
  --size-small: 14px;
  --size-h1: clamp(34px, 2.6vw + 12px, 48px);
  --size-h2: clamp(26px, 2.4vw, 34px);
  --size-h3: 22px;
  --weight-body: 400;
  --weight-medium: 600;
  --weight-bold: 700;
  --weight-display: 800;
  --tracking-display: -.02em;
  --r-xs: 6px;
  --r-sm: 8px;
  --r-md: 10px;
  --r-shot: 10px;
  --r-float: 14px;
  --r-pill: 999px;
  --r-circle: 50%;
  --shadow-card: 0 1px 2px var(--ink-04), 0 6px 18px -8px var(--ink-06);
  --shadow-btn: 0 1px 0 var(--white-18) inset, 0 8px 20px -8px var(--deep-55);
  --shadow-btn-hover: 0 1px 0 var(--white-18) inset, 0 12px 26px -10px var(--deep-60);
  --glow-float: 0 0 0 6px var(--a-06), 0 0 26px 2px var(--a-26), 0 26px 56px -20px var(--deep-38);
  --wrap: 1312px;
  --reading: 840px;
  --header-span: 1280px;
  --gutter: 64px;
  --section-space: 140px;
  --header-height: 76px;
  --ease-out: cubic-bezier(.2, .7, .2, 1);
  --duration-fast: .2s;
  --duration-reveal: .6s;
  --focus-width: 2px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 28px; }
html.nav-open { overflow: hidden; }
body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: var(--size-body);
  font-weight: var(--weight-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
[hidden] { display: none !important; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
button, a, summary { -webkit-tap-highlight-color: var(--a-10); }
img, svg { max-width: 100%; }
img { height: auto; }
svg { flex-shrink: 0; }
button svg, a svg { pointer-events: none; }
:focus-visible { outline: var(--focus-width) solid var(--c-accent); outline-offset: 3px; border-radius: var(--r-sm); }
::selection { background: var(--c-panel-deep); color: var(--c-text); }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: var(--weight-display); line-height: 1.25; text-wrap: balance; }
h1 { font-size: var(--size-h1); letter-spacing: var(--tracking-display); }
h2 { font-size: var(--size-h2); letter-spacing: var(--tracking-display); }
h3 { font-size: var(--size-h3); }
p { margin-top: 0; }
code, pre, kbd { font-family: var(--font-mono); }
code { overflow-wrap: anywhere; font-size: .86em; }
pre {
  margin: 24px 0;
  padding: 20px;
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  background: var(--c-panel-2);
  color: var(--c-text);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  line-height: 1.8;
  -webkit-overflow-scrolling: touch;
}
pre code { overflow-wrap: normal; white-space: pre; }
hr { border: 0; border-top: 1px solid var(--c-border); margin: 32px 0; }
.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }
.reading { width: 100%; max-width: calc(var(--reading) + var(--gutter) * 2); margin-inline: auto; padding-inline: var(--gutter); }
.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.skip-link { position: absolute; left: var(--gutter); top: 8px; z-index: 80; padding: 8px 16px; background: var(--c-bg); color: var(--c-accent-dark); border: 1px solid var(--c-accent); border-radius: var(--r-sm); }
.skip-link:not(:focus) { width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.keep { white-space: nowrap; }
.muted { color: var(--c-muted); }
.mono { font-family: var(--font-mono); }
.text-link { color: var(--c-accent-dark); text-decoration: underline; text-underline-offset: .22em; }
.section { padding-top: var(--section-space); padding-bottom: var(--section-space); }
.section-panel { background: var(--c-panel); color: var(--c-text); }
.section-head { margin-bottom: 48px; }
.section-head h2 { margin: 18px 0 0; }
.section-head p { max-width: 680px; margin-top: 20px; color: var(--c-muted); }
.section-center { text-align: center; }
.section-center p { margin-inline: auto; }
.inspect { display: inline-block; padding: 4px 10px; background: var(--c-panel); color: var(--c-accent-dark); border: 1px solid var(--c-border); border-radius: var(--r-xs); font-family: var(--font-mono); font-size: 12.5px; line-height: 1.5; letter-spacing: .04em; overflow-wrap: anywhere; }
.section-panel .inspect { background: var(--c-bg); color: var(--c-accent-dark); }
.grid-two, .grid-three { display: grid; gap: 24px; }
.grid-two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-two > *, .grid-three > *, .hero-grid > *, .footer-grid > * { min-width: 0; }
.card, .panel { min-width: 0; padding: 28px; border: 1px solid var(--c-border); border-radius: var(--r-md); background: var(--c-bg); color: var(--c-text); box-shadow: var(--shadow-card); }
.card h3, .panel h3 { margin-top: 0; }
.card p:last-child, .panel p:last-child { margin-bottom: 0; }
.panel-soft { background: var(--c-panel-2); color: var(--c-text); }
.prose { min-width: 0; }
.prose p, .prose li { overflow-wrap: break-word; }
.prose h2 { margin-top: 72px; margin-bottom: 24px; scroll-margin-top: 28px; }
.prose h3 { margin-top: 36px; margin-bottom: 16px; }
.prose li + li { margin-top: 10px; }
.prose a:not(.btn):not(.app-store-button) { color: var(--c-accent-dark); text-decoration: underline; text-underline-offset: .2em; }
.prose figure { max-width: 100%; }
.prose > :first-child { margin-top: 0; }
.reveal { opacity: 1; transform: none; }
.reveal-ready .reveal:not(.shown) { opacity: 0; transform: translateY(18px); }
.reveal-ready .reveal { transition: opacity var(--duration-reveal) var(--ease-out), transform var(--duration-reveal) var(--ease-out); }

.cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 52px; padding: 12px 24px; max-width: 100%;
  border: 1px solid var(--c-border); border-radius: var(--r-md);
  background: var(--c-bg); color: var(--c-text);
  font-size: 16px; font-weight: var(--weight-medium); line-height: 1.4;
  text-align: center;
  transition: background-color var(--duration-fast), box-shadow var(--duration-fast), border-color var(--duration-fast), color var(--duration-fast);
}
.btn svg { width: 18px; height: 18px; flex: none; }
.btn-primary { border-color: var(--c-accent); background: var(--c-accent); color: var(--c-on-accent); box-shadow: var(--shadow-btn); }
.btn-primary:hover, .btn-primary.is-hover { background: var(--c-accent-dark); color: var(--c-on-accent); border-color: var(--c-accent-dark); box-shadow: var(--shadow-btn-hover); }
.btn-ghost { background: var(--c-bg); color: var(--c-text); box-shadow: var(--shadow-card); }
.btn-ghost:hover { border-color: var(--a-40); color: var(--c-accent-dark); }
.btn-ghost svg { width: 16px; height: 16px; color: var(--c-muted); transition: transform var(--duration-fast); }
.btn-ghost:hover svg { transform: translateX(2px); color: var(--c-accent); }
.btn:active { box-shadow: none; }
.btn:disabled, .btn[aria-disabled="true"] { cursor: not-allowed; background: var(--c-panel-2); color: var(--c-muted); border-color: var(--c-border); box-shadow: none; }
.btn.is-focus { outline: var(--focus-width) solid var(--c-accent); outline-offset: 3px; }

.topbar, #site-header { position: relative; z-index: 50; background: var(--c-bg); color: var(--c-text); }
.header-wrap { width: 100%; max-width: min(100%, calc(var(--header-span) + var(--gutter) * 2)); padding-inline: var(--gutter); margin-inline: auto; }
.topbar-in { display: flex; align-items: center; justify-content: space-between; gap: 20px; height: var(--header-height); }
.brand { display: inline-flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand-mark { display: block; width: 34px; height: 34px; flex: none; border-radius: var(--r-sm); }
.brand-placeholder { border: 1.5px solid var(--a-40); background: linear-gradient(160deg, var(--c-bg), var(--c-panel)); box-shadow: var(--shadow-card); }
.brand-name { font-family: var(--font-display); font-weight: var(--weight-display); font-size: 17px; letter-spacing: -.02em; line-height: 1.4; }
.desktop-nav { margin-left: auto; min-width: 0; }
.navlist { display: flex; align-items: center; list-style: none; margin: 0; padding: 0; gap: 4px; }
.navlist a { display: block; padding: 7px 16px; border-radius: var(--r-pill); font-size: 15px; line-height: 1.5; color: var(--c-muted); white-space: nowrap; transition: color var(--duration-fast), background-color var(--duration-fast); }
.navlist a:hover { color: var(--c-text); }
.navlist a[aria-current="page"] { background: var(--c-panel); color: var(--c-accent-dark); font-weight: var(--weight-medium); box-shadow: inset 0 0 0 1px var(--a-18); }
.header-tools { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.language-control { position: relative; }
.lang { display: inline-flex; align-items: center; justify-content: center; gap: 7px; padding: 6px 14px; min-height: 36px; border: 1px solid var(--c-border); border-radius: var(--r-pill); background: var(--c-bg); color: var(--c-muted); font-size: 14px; line-height: 1.5; white-space: nowrap; }
.lang svg { width: 15px; height: 15px; }
.lang:hover { color: var(--c-text); border-color: var(--a-26); }
.lang-short { display: none; }
.language-menu { position: absolute; right: 0; top: calc(100% + 10px); min-width: 188px; padding: 8px; margin: 0; list-style: none; background: var(--c-bg); color: var(--c-text); border: 1px solid var(--c-border); border-radius: var(--r-md); box-shadow: var(--shadow-card); z-index: 3; }
.language-menu a { display: flex; align-items: center; min-height: 44px; padding: 8px 12px; border-radius: var(--r-xs); font-size: 15px; }
.language-menu a:hover, .language-menu a[aria-current="true"] { background: var(--c-panel); color: var(--c-accent-dark); }
.menu-toggle { display: none; align-items: center; justify-content: center; min-width: 44px; min-height: 44px; border: 1px solid var(--c-border); border-radius: var(--r-sm); background: var(--c-bg); color: var(--c-text); }
.menu-toggle svg { width: 22px; height: 22px; }
.mobile-drawer { display: none; }
.menu-veil { position: fixed; inset: var(--header-height) 0 0; z-index: 1; background: var(--ink-veil); }
.mobile-drawer { position: absolute; top: 100%; left: 0; right: 0; z-index: 2; max-height: calc(100dvh - var(--header-height)); overflow-y: auto; overscroll-behavior: contain; padding: 16px var(--gutter) 28px; background: var(--c-bg); color: var(--c-text); border-bottom: 1px solid var(--c-border); box-shadow: var(--shadow-card); }
.mobile-drawer ul { list-style: none; margin: 0; padding: 0; }
.mobile-drawer a { display: flex; align-items: center; width: 100%; min-height: 48px; padding: 12px 16px; border-radius: var(--r-sm); font-size: 16px; }
.mobile-drawer a:hover, .mobile-drawer a[aria-current] { background: var(--c-panel); color: var(--c-accent-dark); }
.drawer-label { margin: 18px 16px 8px; padding-top: 18px; border-top: 1px solid var(--c-border); font-size: 13px; color: var(--c-muted); }

.hero { position: relative; padding-top: 58px; overflow-x: clip; }
.hero-grid { display: grid; grid-template-columns: 55fr 45fr; gap: 40px; align-items: center; }
.hero-copy { position: relative; z-index: 2; }
.kicker { display: inline-flex; align-items: center; gap: 10px; margin-bottom: 0; padding: 5px 14px 5px 12px; border-radius: var(--r-sm); background: var(--c-panel); color: var(--c-accent-dark); font-size: 14px; font-weight: var(--weight-medium); line-height: 1.6; }
.kicker-dot { width: 8px; height: 8px; flex-shrink: 0; border-radius: var(--r-circle); background: var(--c-accent); box-shadow: 0 0 0 4px var(--a-14); }
.h1 { margin: 22px 0 0; font-family: var(--font-display); font-weight: var(--weight-display); font-size: var(--size-h1); line-height: 1.18; letter-spacing: var(--tracking-display); color: var(--c-text); }
.h1-line { display: block; white-space: nowrap; }
.w { display: inline-block; animation: word-rise .56s var(--ease-out) both; }
.w1 { animation-delay: 0ms; }
.w2 { animation-delay: 110ms; }
.w3 { animation-delay: 220ms; }
.w4 { animation-delay: 330ms; }
.w5 { animation-delay: 440ms; }
.hl { position: relative; color: var(--c-accent); isolation: isolate; }
.hl::after { content: ""; position: absolute; z-index: -1; left: -.05em; right: -.05em; bottom: .08em; height: .3em; border-radius: var(--r-xs); background: var(--a-14); transform-origin: left center; animation: word-sweep .48s .62s var(--ease-out) both; }
@keyframes word-rise { from { opacity: 0; transform: translateY(.42em); } to { opacity: 1; transform: none; } }
@keyframes word-sweep { from { transform: scaleX(0); } to { transform: scaleX(1); } }
.lede { margin: 26px 0 0; max-width: 600px; color: var(--c-muted); font-size: 18px; line-height: 1.75; }
.lede strong { color: var(--c-text); font-weight: var(--weight-bold); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 0; padding: 0; list-style: none; }
.chip { display: inline-flex; align-items: center; gap: 8px; max-width: 100%; padding: 4px 12px; border-radius: var(--r-pill); background: var(--c-panel-2); color: var(--c-text); border: 1px solid var(--c-border); font-size: 13.5px; line-height: 1.6; overflow-wrap: anywhere; }
.chip::before { content: ""; width: 5px; height: 5px; flex-shrink: 0; border-radius: var(--r-circle); background: var(--c-accent); }
.devices { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 22px; margin: 22px 0 0; padding: 18px 0 0; max-width: 600px; border-top: 1px solid var(--c-border); list-style: none; }
.dev { display: inline-flex; align-items: center; gap: 7px; font-size: 14px; line-height: 1.4; color: var(--c-muted); }
.dev svg { width: 18px; height: 18px; color: var(--c-accent-dark); }
.dev:hover { color: var(--c-accent-dark); }
.store-pill { display: inline-flex; align-items: center; gap: 6px; margin-left: 2px; padding: 3px 11px; border-radius: var(--r-pill); border: 1px solid var(--a-26); background: var(--c-panel); color: var(--c-accent-dark); font-size: 13px; font-weight: var(--weight-medium); line-height: 1.5; }
.store-pill svg { width: 12px; height: 12px; }
.strip { display: flex; align-items: center; gap: 30px; margin-top: 62px; min-height: 42px; padding: 10px 18px; background: var(--c-panel); color: var(--c-text); border: 1px solid var(--c-border); border-radius: var(--r-md); font-family: var(--font-mono); font-size: 12px; line-height: 1.4; overflow: hidden; white-space: nowrap; }
.strip-seg { display: inline-flex; align-items: center; gap: 9px; flex-shrink: 0; }
.strip-k { color: var(--c-accent-dark); letter-spacing: .1em; text-transform: uppercase; }
.strip-v { color: var(--c-muted); }
.strip-dot { display: inline-flex; align-items: center; gap: 6px; color: var(--c-muted); }
.strip-dot::before { content: ""; width: 6px; height: 6px; flex-shrink: 0; border-radius: var(--r-circle); background: var(--c-accent); }
.strip-dot.d-direct::before { background: var(--c-success); }
.strip-dot.d-reject::before { background: var(--c-error); }
.strip-gap { flex: 1; }
.strip-bar { width: 1px; height: 14px; background: var(--c-border); flex-shrink: 0; }

.site-footer { padding-top: 72px; padding-bottom: 28px; background: var(--c-panel); color: var(--c-text); }
.footer-grid { display: grid; grid-template-columns: 1.35fr .7fr 1.2fr .75fr; gap: 40px; }
.footer-brand p { margin: 20px 0 0; max-width: 360px; color: var(--c-muted); font-size: 15px; line-height: 1.9; }
.footer-title { margin: 0 0 16px; font-size: 15px; font-weight: var(--weight-bold); }
.footer-links { list-style: none; margin: 0; padding: 0; }
.footer-links li + li { margin-top: 8px; }
.footer-links a { display: inline-block; font-size: 14px; color: var(--c-muted); overflow-wrap: anywhere; }
.footer-links a:hover { color: var(--c-accent-dark); text-decoration: underline; text-underline-offset: .2em; }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px 24px; margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--c-border); color: var(--c-muted); font-size: 13px; }
.footer-bottom p { margin: 0; }
.legal-links { display: flex; flex-wrap: wrap; gap: 18px; }

@media (max-width: 1280px) {
  .topbar-in { gap: 14px; }
  .navlist a { padding-inline: 11px; }
}
@media (max-width: 1100px) {
  :root { --gutter: 40px; }
  .desktop-nav { display: none; }
  .header-tools { margin-left: auto; }
  .menu-toggle { display: inline-flex; }
  .mobile-drawer:not([hidden]) { display: block; }
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 64px; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 768px) {
  :root { --size-h1: clamp(24px, 7vw, 30px); }
  .h1-line { white-space: normal; }
}
@media (max-width: 640px) {
  :root { --gutter: 20px; --size-body: 16px; --header-height: 64px; }
  .topbar-in { gap: 8px; }
  .brand { gap: 8px; }
  .brand-name { font-size: 14px; }
  .brand-mark { width: 28px; height: 28px; }
  .header-tools { margin-left: auto; gap: 6px; }
  .lang { min-height: 44px; padding-inline: 10px; }
  .lang-long { display: none; }
  .lang-short { display: inline; }
  .lang svg { display: none; }
  .hero { padding-top: 28px; }
  .hero-grid { gap: 48px; }
  .kicker { font-size: 12px; }
  .lede { font-size: 16px; }
  .btn { padding-inline: 18px; }
  .cta { gap: 10px; }
  .chips { gap: 6px; flex-direction: row; flex-wrap: wrap; }
  .chip { font-size: 12px; padding-inline: 9px; }
  .devices { gap: 12px 18px; }
  .strip { gap: 18px; }
  .section-head { margin-bottom: 32px; }
  .section-head h2 { font-size: 24px; }
  .grid-two, .grid-three { grid-template-columns: minmax(0, 1fr); }
  .card, .panel { padding: 22px; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .footer-bottom { margin-top: 32px; }
  .tilt, [data-tilt] { transform: none !important; }
}
@media (max-width: 360px) {
  :root { --gutter: 16px; }
  .brand-name { font-size: 12px; }
  .brand { gap: 6px; }
  .lang { padding-inline: 8px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal-ready .reveal:not(.shown) { opacity: 1; transform: none; }
}