:root {
  --ink: #20212b;
  --muted: #686a78;
  --accent: #5359df;
  --line: #e8e8ef;
  --paper: #fafafc;
  --width: 1120px;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 100px; }
body { margin: 0; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; height: auto; }
button, summary { font: inherit; }
::selection { color: #25276b; background: #ddddff; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; border-radius: 4px; }
.wrap { width: min(var(--width), calc(100% - 56px)); margin-inline: auto; }
.skip-link { position: fixed; top: 8px; left: 8px; z-index: 100; padding: 12px 18px; background: white; transform: translateY(-160%); }
.skip-link:focus { transform: none; }
.site-header { height: 80px; background: rgba(250,250,252,.95); border-bottom: 1px solid var(--line); }
.nav { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 750; letter-spacing: -.5px; white-space: nowrap; }
.brand img { width: 34px; height: 34px; border-radius: 9px; }
.brand-word { font-size: 21px; letter-spacing: -1px; }
.brand-dot { color: var(--accent); }
.nav-links { display: flex; gap: 26px; align-items: center; font-size: 13px; color: #555764; }
.nav-links a:hover, .footer-links a:hover { color: var(--accent); }
.nav-links .nav-cta { background: var(--ink); color: white; padding: 11px 18px; border-radius: 24px; }
.eyebrow { font-size: 11px; letter-spacing: 2.5px; font-weight: 700; color: var(--accent); margin: 0 0 22px; text-transform: uppercase; }
.eyebrow::before { content: ""; display: inline-block; width: 7px; height: 7px; margin: 0 9px 1px 0; border-radius: 50%; background: currentColor; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { letter-spacing: -1px; }
h1 { font-size: clamp(38px, 5vw, 64px); line-height: 1.2; font-weight: 750; margin-bottom: 24px; }
h2 { font-size: clamp(29px, 3.5vw, 42px); line-height: 1.3; margin-bottom: 18px; }
h3 { font-size: 23px; line-height: 1.4; margin-bottom: 14px; }
p { line-height: 1.85; }
.muted, .lead { color: var(--muted); }
.lead { font-size: 17px; line-height: 1.95; max-width: 520px; }
.accent { color: var(--accent); }
.button { min-height: 50px; display: inline-flex; align-items: center; justify-content: center; gap: 13px; border-radius: 30px; padding: 14px 23px; background: var(--ink); color: white; font-size: 14px; font-weight: 600; transition: background .2s, transform .2s; }
.button:hover { background: #3d3e50; transform: translateY(-2px); }
.button svg { width: 20px; height: 23px; fill: currentColor; }
.button-light { background: white; color: var(--ink); }
.button-light:hover { background: #ececfb; }
.text-link { display: inline-flex; gap: 9px; align-items: center; color: var(--accent); font-size: 14px; font-weight: 650; }
.text-link:hover { text-decoration: underline; text-underline-offset: 5px; }
.actions { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; margin-top: 30px; }
.hero { padding: 78px 0 70px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: .95fr 1.15fr; gap: 50px; align-items: center; min-height: 450px; }
.hero-copy { padding-block: 18px; }
.hero-copy .lead { font-size: 16px; max-width: 400px; }
.hero h1 { font-size: clamp(38px, 4.2vw, 55px); }
.hero-note { font-size: 12px; color: var(--muted); margin: 18px 0 0; }
.hero-art { position: relative; padding: 32px 0 44px; min-width: 0; }
.hero-art::before { content: ""; position: absolute; inset: -25px -50px -30px; background: radial-gradient(ellipse at 50% 55%, #e3e1f5, transparent 68%); z-index: -1; }
.device { overflow: hidden; border: 8px solid #26272d; outline: 1px solid #777983; border-radius: 23px; background: #24252b; box-shadow: 0 22px 45px #24254124, 0 4px 12px #24254122; }
.hero-art .device { transform: rotate(-3deg); }
.device img { width: 100%; }
.art-caption { text-align: center; margin: 25px 0 0; font-size: 11px; color: #77798a; letter-spacing: 1.5px; }
.floating-label { position: absolute; bottom: 5px; right: -8px; border: 1px solid #eeeeff; background: white; border-radius: 13px; padding: 16px 20px; box-shadow: 0 14px 28px #4c4c6c12; display: flex; gap: 13px; align-items: center; }
.floating-label strong { display: block; font-size: 13px; margin-bottom: 4px; }
.floating-label span { color: var(--muted); font-size: 11px; }
.floating-icon { color: var(--accent); width: 32px; height: 32px; }
.feature-strip { border-block: 1px solid var(--line); display: grid; grid-template-columns: repeat(4,1fr); padding-block: 25px; }
.strip-item { padding: 0 22px; border-right: 1px solid var(--line); }
.strip-item:first-child { padding-left: 0; }
.strip-item:last-child { border: 0; }
.strip-item strong { display: block; font-size: 16px; margin-bottom: 7px; }
.strip-item span { font-size: 12px; color: var(--muted); }
.section { padding-block: 86px; }
.section-heading { max-width: 650px; margin-bottom: 38px; }
.section-heading p:last-child { margin-bottom: 0; }
.feature-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.feature-card { padding: 38px 38px 0; border: 1px solid var(--line); border-radius: 24px; background: #fff; overflow: hidden; }
.feature-card .description { font-size: 14px; color: var(--muted); max-width: 390px; min-height: 78px; }
.card-number { font-size: 11px; color: var(--accent); font-weight: 700; letter-spacing: 2px; margin-bottom: 20px; display: block; }
.speed-options { display: flex; gap: 7px; margin: 24px 0 32px; flex-wrap: wrap; }
.speed-options span { padding: 7px 10px; border-radius: 6px; background: #f3f3f8; color: #666776; font-size: 11px; }
.speed-options .selected { background: var(--accent); color: white; }
.screen-window { width: 230px; max-width: 100%; margin: 0 auto -70px; border: 6px solid #26272d; border-radius: 22px 22px 0 0; box-shadow: 0 10px 35px #29283c1c; overflow: hidden; }
.screen-window img { width: 100%; }
.feature-card.purple { background: #f0effa; border-color: #eeecf8; }
.transfer-points { display: flex; gap: 12px; font-size: 11px; margin: 28px 0 34px; color: #68668d; }
.transfer-points span { display: inline-flex; align-items: center; gap: 8px; }
.transfer-points span + span::before { content: "→"; padding-right: 4px; opacity: .5; }
.feature-wide { grid-column: 1 / -1; padding: 42px; display: grid; grid-template-columns: .9fr 1.1fr; gap: 55px; align-items: center; background: #20212c; color: white; min-height: 340px; }
.feature-wide .description { color: #b6b7c8; min-height: auto; margin-bottom: 0; }
.feature-wide .card-number { color: #aaa6ff; }
.file-board { border: 1px solid #4a4b5f; border-radius: 15px; padding: 20px; background: #2a2b39; transform: rotate(-2deg); }
.file-board-top { font-size: 11px; color: #bcbed1; display: flex; justify-content: space-between; margin-bottom: 24px; }
.folder-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; }
.folder { padding: 18px 6px 13px; background: #353646; border-radius: 10px; text-align: center; font-size: 10px; color: #cccddd; }
.folder-icon { display: block; position: relative; width: 44px; height: 33px; background: #8784f1; border-radius: 4px; margin: 0 auto 13px; }
.folder-icon::before { content: ""; position: absolute; width: 21px; height: 8px; left: 0; top: -5px; border-radius: 4px 5px 0 0; background: #a5a2ff; }
.file-board-bottom { border-top: 1px solid #414254; margin-top: 20px; padding-top: 14px; text-align: right; font-size: 10px; color: #bcb9ff; letter-spacing: 3px; }
.experience { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: center; }
.experience-art { background: #eeeeF5; border-radius: 24px; padding: 40px 40px 0; height: 440px; overflow: hidden; }
.experience-art .device { width: 274px; margin: 0 auto; transform: rotate(5deg); }
.check-list { list-style: none; padding: 0; margin: 26px 0 0; }
.check-list li { padding: 13px 0; border-bottom: 1px solid var(--line); font-size: 14px; display: flex; gap: 15px; align-items: baseline; }
.check-list li span { color: var(--accent); font-size: 12px; font-weight: 600; }
.privacy-band { border: 1px solid var(--line); border-radius: 20px; padding: 35px 40px; display: flex; align-items: center; gap: 28px; justify-content: space-between; background: #fff; }
.privacy-band h2 { font-size: 23px; margin-bottom: 10px; }
.privacy-band p { font-size: 13px; color: var(--muted); margin-bottom: 0; max-width: 700px; }
.privacy-band .text-link { flex-shrink: 0; }
.faq { display: grid; grid-template-columns: .7fr 1.3fr; gap: 70px; }
.faq details { border-bottom: 1px solid var(--line); padding: 20px 0; }
.faq details:first-child { padding-top: 0; }
.faq summary { cursor: pointer; font-size: 15px; font-weight: 600; list-style: none; display: flex; align-items: baseline; justify-content: space-between; gap: 20px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--accent); font-size: 22px; font-weight: 400; }
.faq details[open] summary::after { content: "−"; }
.faq details p { color: var(--muted); font-size: 14px; margin: 15px 28px 0 0; }
.faq details a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.closing { text-align: center; padding: 68px 24px; border-radius: 25px; background: #eeedf8; margin-bottom: 70px; }
.closing img { width: 56px; height: 56px; border-radius: 14px; margin: 0 auto 24px; box-shadow: 0 8px 20px #5754ad22; }
.closing h2 { font-size: clamp(28px,3.5vw,40px); }
.closing p { color: var(--muted); font-size: 14px; margin-bottom: 26px; }
.site-footer { border-top: 1px solid var(--line); padding-block: 32px; }
.footer-top, .footer-bottom { display: flex; justify-content: space-between; align-items: center; gap: 24px; }
.footer-top { margin-bottom: 22px; }
.footer-links { display: flex; gap: 24px; font-size: 12px; color: var(--muted); flex-wrap: wrap; }
.footer-bottom { color: #787a87; font-size: 11px; line-height: 1.8; }
.footer-bottom p { margin: 0; }
.directory-intro { padding: 85px 0 50px; }
.directory-intro h1 { max-width: 800px; }
.directory-feature { border-radius: 26px; background: #eeeef8; padding: 48px; display: grid; grid-template-columns: 1fr 1.15fr; align-items: center; gap: 60px; overflow: hidden; margin-bottom: 60px; }
.app-heading { display: flex; align-items: center; gap: 16px; margin-bottom: 27px; }
.app-heading img { width: 60px; height: 60px; border-radius: 15px; }
.app-heading h2 { font-size: 28px; margin: 0 0 5px; }
.app-heading span { font-size: 12px; color: var(--muted); }
.directory-feature .lead { font-size: 15px; }
.directory-feature .device { transform: rotate(3deg); }
.directory-contact { padding-bottom: 70px; display: flex; justify-content: space-between; gap: 20px; align-items: center; }
.directory-contact h2 { font-size: 24px; margin-bottom: 8px; }
.directory-contact p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
.policy-hero { padding: 65px 0 42px; border-bottom: 1px solid var(--line); }
.breadcrumb { display: inline-block; font-size: 12px; color: var(--muted); margin-bottom: 30px; }
.breadcrumb:hover { color: var(--accent); }
.policy-hero h1 { font-size: 44px; }
.policy-hero .lead { max-width: 780px; font-size: 15px; }
.policy-meta { display: flex; flex-wrap: wrap; gap: 10px 24px; color: var(--muted); font-size: 12px; margin-top: 24px; }
.policy-layout { display: grid; grid-template-columns: 220px minmax(0,1fr); gap: 65px; padding-block: 48px 90px; }
.policy-toc { align-self: start; position: sticky; top: 30px; }
.policy-toc strong { display: block; font-size: 12px; margin-bottom: 18px; }
.policy-toc ol { padding: 0; margin: 0; list-style: none; }
.policy-toc li { margin-bottom: 14px; font-size: 12px; line-height: 1.6; }
.policy-toc a { color: var(--muted); }
.policy-toc a:hover { color: var(--accent); }
.policy-article { min-width: 0; font-size: 14px; line-height: 1.9; }
.policy-article section { margin-bottom: 42px; scroll-margin-top: 25px; }
.policy-article h2 { font-size: 24px; margin-bottom: 18px; }
.policy-article h3 { font-size: 16px; margin-top: 22px; margin-bottom: 8px; letter-spacing: 0; }
.policy-article p, .policy-article li { color: #565967; }
.policy-article ul { padding-left: 20px; }
.policy-article li { padding-left: 3px; margin-bottom: 10px; }
.policy-article a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; overflow-wrap: anywhere; }
.policy-article strong { color: var(--ink); }
.policy-note { border-left: 3px solid #7b78e3; border-radius: 0 10px 10px 0; background: #f0eff9; padding: 20px 24px; margin-bottom: 32px; }
.policy-note p:last-child { margin-bottom: 0; }
.sdk-card { border: 1px solid var(--line); padding: 22px 24px; border-radius: 12px; background: #fff; margin-top: 15px; }
.sdk-card h3 { margin-top: 0; }
.sdk-card p { margin-bottom: 10px; }
.sdk-card p:last-child { margin-bottom: 0; }
.error-page { min-height: 65vh; padding-block: 100px; }
@media (min-width: 1500px) { .hero { padding-block: 100px; } }
@media (max-width: 950px) {
  .hero-grid { gap: 30px; grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 40px; }
  .hero-art .device { border-width: 6px; border-radius: 18px; }
  .art-caption { visibility: hidden; }
  .feature-card { padding: 28px 28px 0; }
  .feature-wide { padding: 32px; gap: 30px; }
  .experience, .faq { gap: 40px; }
  .directory-feature { gap: 35px; padding: 32px; }
  .policy-layout { grid-template-columns: 180px minmax(0,1fr); gap: 30px; }
}
@media (max-width: 700px) {
  .wrap { width: calc(100% - 40px); }
  .site-header { height: 68px; }
  .brand { font-size: 16px; }
  .brand img { width: 29px; height: 29px; border-radius: 8px; }
  .nav { gap: 10px; }
  .nav-links { gap: 17px; font-size: 12px; }
  .nav-links .desktop-link { display: none; }
  .nav-links .nav-cta { padding: 9px 14px; }
  .hero { padding: 45px 0 38px; }
  .hero-grid { display: block; }
  .hero-copy { padding: 0; }
  .hero h1 { font-size: clamp(36px,9vw,48px); }
  .hero-copy .lead { max-width: 500px; }
  .hero-art { margin: 35px auto 0; max-width: 480px; padding-bottom: 0; }
  .hero-art::before { inset: 0 -20px -10px; }
  .floating-label { position: relative; right: auto; bottom: auto; width: max-content; margin: 24px 0 0 auto; padding: 13px 17px; }
  .art-caption { display: none; }
  .feature-strip { grid-template-columns: 1fr 1fr; padding-block: 0; }
  .strip-item { padding: 23px 10px 23px 0; }
  .strip-item:nth-child(even) { padding-left: 22px; border: 0; }
  .strip-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .strip-item strong { font-size: 14px; }
  .section { padding-block: 58px; }
  .section-heading { margin-bottom: 28px; }
  .section-heading .lead { font-size: 15px; }
  .feature-grid { grid-template-columns: 1fr; gap: 18px; }
  .feature-card { padding: 28px 26px 0; }
  .feature-card .description { min-height: 0; }
  .screen-window { width: 230px; }
  .feature-wide { grid-column: auto; display: block; padding: 28px 26px; }
  .file-board { margin-top: 35px; }
  .experience { display: flex; flex-direction: column-reverse; gap: 30px; }
  .experience > * { width: 100%; }
  .experience-art { height: 365px; padding: 28px 24px 0; }
  .experience-art .device { width: 245px; }
  .privacy-band { display: block; padding: 28px 26px; }
  .privacy-band .text-link { margin-top: 22px; }
  .faq { display: block; }
  .faq details:first-child { padding-top: 15px; }
  .closing { margin-bottom: 45px; padding: 45px 23px; }
  .footer-top, .footer-bottom { align-items: flex-start; flex-direction: column; gap: 18px; }
  .footer-links { gap: 18px; }
  .directory-intro { padding: 50px 0 28px; }
  .directory-intro h1 { font-size: 39px; }
  .directory-feature { display: block; padding: 30px 26px; margin-bottom: 38px; }
  .directory-feature .device { margin: 40px 5px 12px; }
  .directory-contact { display: block; padding-bottom: 45px; }
  .directory-contact .text-link { margin-top: 20px; }
  .policy-hero { padding: 38px 0 30px; }
  .policy-hero h1 { font-size: 35px; }
  .policy-layout { display: block; padding-block: 25px 45px; }
  .policy-toc { position: static; border-bottom: 1px solid var(--line); margin-bottom: 35px; padding-bottom: 15px; }
  .policy-toc ol { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
  .policy-article h2 { font-size: 22px; }
  .sdk-card { padding: 20px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button { transition: none; }
}