:root{--ink:#17344f;--muted:#586f83;--paper:#f5f8fc;--accent:#91d5ff}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:inherit;text-decoration:none}a:focus-visible{outline:3px solid #187bca;outline-offset:6px}header,footer{max-width:1280px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:28px 48px}.brand{display:flex;align-items:center;gap:10px;font-size:23px;font-weight:700;letter-spacing:-1px}.brand img{border-radius:10px}nav{display:flex;gap:32px;align-items:center;font-size:14px}.nav-button{border:1px solid #bdcfdf;border-radius:30px;padding:12px 20px}.hero{text-align:center;padding:64px 40px 0}.eyebrow{font-size:11px;font-weight:700;letter-spacing:2px;display:block}.eyebrow span{display:inline-block;background:#269ce9;width:7px;height:7px;border-radius:50%;margin-right:8px}h1{font-size:clamp(52px,6.7vw,92px);font-weight:500;letter-spacing:-5px;line-height:1.06;margin:26px 0}h1 em{font-family:Georgia,serif;font-weight:400;color:#287db5}.intro{font-size:18px;line-height:1.7;color:var(--muted)}.button{background:var(--ink);color:white;display:inline-flex;gap:38px;align-items:center;padding:17px 24px;border-radius:7px;font-size:14px;margin-top:18px}.button:hover{background:#215c87}.platforms,.small{font-size:12px;color:var(--muted);margin-top:18px}.product{max-width:1100px;margin:65px auto 0;padding:18px 18px 0;background:#e0ecf6;border-radius:16px 16px 0 0;overflow:hidden}.product-label{display:flex;justify-content:space-between;font-size:9px;letter-spacing:1.5px;padding:3px 3px 18px}.product img{display:block;width:100%;height:auto;border-radius:6px 6px 0 0}.experience{max-width:1280px;margin:auto;padding:100px 48px}.section-top{position:relative}.section-top>p:last-child{color:var(--muted);line-height:1.7}h2{font-size:clamp(36px,4vw,56px);font-weight:500;letter-spacing:-2px;line-height:1.12;margin:24px 0}.features{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:42px 48px;margin-top:58px}.features article{border-top:1px solid #c5d5e3;padding-top:24px}.number{font-size:10px;letter-spacing:1.8px;color:var(--muted)}h3{font-size:23px;font-weight:500;letter-spacing:-.7px;margin:26px 0 15px}.features p{color:var(--muted);font-size:15px;line-height:1.8;margin:0 0 20px}.tags{display:flex;gap:8px;flex-wrap:wrap}.tags span{font-size:11px;padding:8px 10px;border:1px solid #cbdbe9;border-radius:20px}.translation{display:flex;flex-direction:column;gap:8px;font-family:Georgia,serif;font-size:18px}.translation span:nth-child(2){color:#287db5}.translation span:last-child{color:#607e98}.devices{font-size:16px;padding-top:10px}.devices span{margin:0 8px;color:#4387b6}.privacy{background:var(--ink);color:var(--paper);padding:70px max(48px,calc((100vw - 1184px)/2));display:grid;grid-template-columns:1fr 1fr;gap:0 80px}.privacy>.eyebrow{grid-column:1/-1;color:var(--accent)}.privacy>div{padding-top:12px;line-height:1.85;color:#d5e5f3}.text-link{display:inline-block;border-bottom:1px solid #7fa6c5;font-size:13px;margin-top:10px}.closing{text-align:center;padding:95px 24px}.closing img{border-radius:18px}.closing h2{margin-top:25px}.closing>p{color:var(--muted)}.small a{text-decoration:underline}footer{border-top:1px solid #d5e1ed;font-size:12px;color:var(--muted)}footer .brand{font-size:18px}footer div{display:flex;gap:24px}@media(min-width:900px){.section-top>p:last-child{position:absolute;right:0;bottom:0}}@media(max-width:700px){header,footer{padding:22px}nav{gap:18px}nav>a:first-child{display:none}.nav-button{padding:10px 13px}.hero{padding:45px 18px 0}h1{letter-spacing:-2.8px}.intro{font-size:16px}.desktop{display:none}.product{padding:10px 10px 0;margin-top:45px}.product-label{font-size:7px;letter-spacing:1px}.experience{padding:65px 24px}.features{grid-template-columns:1fr;gap:35px;margin-top:35px}.privacy{padding:50px 24px;grid-template-columns:1fr;gap:0}.privacy>.eyebrow{grid-column:auto}.closing{padding:65px 24px}footer{flex-wrap:wrap;gap:24px}footer div{width:100%}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* Blue accents echo the app icon while keeping long-form reading calm. */
.hero{background:radial-gradient(ellipse at 50% 27%,#e8f4ff 0,transparent 65%)}.button{background:#176fae;box-shadow:0 4px 14px #17344f12}.button:hover{background:#145b90}.product{box-shadow:0 18px 70px #17344f0b}.tags span{background:#edf4fa}.privacy{background:linear-gradient(115deg,#17344f,#1b4567)}.closing{background:radial-gradient(ellipse at 50% 60%,#eaf4fd 0,transparent 68%)}

.download-buttons{display:flex;justify-content:center;gap:14px;flex-wrap:wrap}.button-secondary{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1px #a9c5dc}.button-secondary:hover{background:#e1effa}@media(max-width:420px){.download-buttons{flex-direction:column;align-items:center}.download-buttons .button{margin-top:10px;min-width:240px;justify-content:space-between}}

.language-switch{font-size:13px;white-space:nowrap;border-left:1px solid #bdcfdf;padding-left:20px}html[lang="zh-CN"] h1{font-size:clamp(42px,5.7vw,78px);line-height:1.3;letter-spacing:-2px}html[lang="zh-CN"] h1 em{font-style:normal;font-family:inherit}html[lang="zh-CN"] h2{line-height:1.35;letter-spacing:-1px}html[lang="zh-CN"] .eyebrow{letter-spacing:3px}@media(max-width:700px){header{flex-wrap:wrap;gap:18px}nav{gap:14px}.language-switch{padding-left:14px}html[lang="zh-CN"] .intro{line-height:1.9}}

/* A compact closing invitation, secondary to the opening hero. */
.closing{max-width:1280px;margin:auto;padding:56px 48px;display:flex;align-items:center;justify-content:space-between;gap:36px;text-align:left;background:none}.closing-copy{display:flex;align-items:center;gap:18px;min-width:0}.closing-copy>img{width:44px;height:44px;border-radius:12px;flex-shrink:0}.closing h2,html[lang="zh-CN"] .closing h2{font-size:28px;letter-spacing:-.7px;line-height:1.35;margin:0 0 8px}.closing-copy p{font-size:14px;line-height:1.7;color:var(--muted);margin:0}.closing-actions{flex-shrink:0;text-align:right}.closing .download-buttons{gap:10px}.closing .button{margin-top:0;padding:14px 18px;gap:20px;font-size:13px}.closing .small{margin:14px 0 0;font-size:11px}@media(max-width:1000px){.closing{flex-direction:column;align-items:flex-start;gap:24px}.closing-actions{text-align:left}.closing .download-buttons{justify-content:flex-start}}@media(max-width:700px){.closing{padding:36px 24px;gap:22px}.closing h2,html[lang="zh-CN"] .closing h2{font-size:24px}.closing-copy{gap:14px}.closing-copy p{font-size:13px}.closing-actions{width:100%}.closing .button{gap:16px}}@media(max-width:420px){.closing .download-buttons{align-items:stretch}.closing .button{min-width:0;width:100%;margin-top:0}}

.notes {
  max-width: 860px;
  margin: auto;
  padding: 40px 32px 72px;
}
.notes h1, html[lang="zh-CN"] .notes h1 {
  font-size: clamp(38px, 6vw, 64px);
  letter-spacing: -.04em;
  margin: 0 0 34px;
}
.notes-card {
  padding: 26px 30px;
  margin-bottom: 16px;
  border: 1px solid #d5e1ed;
  border-radius: 12px;
  background: #fff;
}
.notes .notes-card h2, html[lang="zh-CN"] .notes-card h2 {
  font-size: 24px;
  letter-spacing: -.02em;
  margin: 0 0 12px;
}
.notes-card h3 { font-size: 16px; margin: 20px 0 8px; }
.notes-card p, .notes-card ul { color: var(--muted); line-height: 1.75; }
.notes-card ul { margin: 0; padding-left: 1.3em; }
.notes-card li + li { margin-top: 6px; }
nav a[aria-current="page"] { text-decoration: underline; text-underline-offset: .3em; }
@media (max-width: 700px) {
  nav { flex-wrap: wrap; }
  .notes { padding: 30px 22px 50px; }
  .notes-card { padding: 20px; }
}