:root {
  color-scheme: light dark;
  --bg: #f4f3ef;
  --surface: #eaeae4;
  --paper: #fcfcf9;
  --ink: #202521;
  --muted: #5b645e;
  --line: #c8cdc5;
  --accent: #007782;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 24px; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
a { color: var(--accent); text-underline-offset: .25em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 6px; border-radius: 2px; }
img { display: block; max-width: 100%; height: auto; }
figure, p { margin: 0; }
p + p { margin-top: 1rem; }
h1, h2, h3 { line-height: 1.08; font-weight: 550; letter-spacing: -.045em; margin: 0; text-wrap: balance; }
h1 { font-size: clamp(2.9rem, 5.5vw, 5rem); }
h2 { font-size: clamp(2.3rem, 4vw, 3.6rem); }
h3 { font-size: 1.8rem; }
h1 span, h2 span { color: var(--accent); }
.wrap { width: min(1160px, calc(100% - 80px)); margin-inline: auto; }
.skip { position: absolute; top: -100px; left: 20px; z-index: 10; padding: 12px; background: var(--paper); }
.skip:focus { top: 12px; }
.site-header { display: flex; justify-content: space-between; align-items: center; gap: 24px; min-height: 100px; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-size: 22px; font-weight: 650; letter-spacing: -.04em; }
.brand img { border-radius: 9px; }
.brand span { font: 10px var(--mono); letter-spacing: .08em; margin-left: 12px; color: var(--muted); }
nav { display: flex; flex-wrap: wrap; gap: 24px; align-items: center; }
nav a { font-size: 14px; color: var(--ink); text-decoration: none; padding-block: 10px; }
nav a:hover { color: var(--accent); text-decoration: underline; }
.hero { display: grid; grid-template-columns: 1.15fr 1fr; align-items: center; gap: 70px; padding: 64px 0 56px; }
.eyebrow { color: var(--accent); font: 12px/1.5 var(--mono); letter-spacing: .1em; margin-bottom: 24px; }
.hero h1 { margin-bottom: 28px; }
.intro { color: var(--muted); max-width: 420px; margin-bottom: 30px; font-size: 18px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 14px; padding: 16px 22px; border-radius: 6px; background: var(--accent); color: var(--paper); text-decoration: none; font-size: 15px; font-weight: 600; line-height: 1.5; }
.button:hover { filter: brightness(.9); text-decoration: underline; }
.small { color: var(--muted); font-size: 13px; }
.hero-copy > .small { margin-top: 16px; }
.hero-visual { padding: 20px 28px 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 4px; }
.screen-heading, figcaption { display: flex; justify-content: space-between; font: 10px/1.5 var(--mono); letter-spacing: .07em; color: var(--muted); }
.screen-heading { margin-bottom: 20px; }
.phone { width: 280px; border-radius: 22px; border: 1px solid #d8dbda; margin-inline: auto; }
.hero-visual .phone { width: 252px; box-shadow: 0 16px 30px #0000000d; }
figcaption { margin-top: 16px; }
.index-strip { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 20px 0; border-block: 1px solid var(--line); font: 11px/1.6 var(--mono); letter-spacing: .05em; color: var(--muted); }
.index-strip a { text-decoration: none; }
.section { padding-block: 88px; border-bottom: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: 1.1fr 1fr; column-gap: 80px; margin-bottom: 40px; }
.section-heading .eyebrow { grid-column: 1 / -1; }
.section-heading > p:last-child { color: var(--muted); align-self: end; max-width: 450px; }
.instrument-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.live-note { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1.4fr; gap: 12px 60px; padding: 28px 32px; border: 1px solid var(--line); }
.live-note .eyebrow { margin: 0; }
.live-note h3 { grid-column: 1; }
.live-note p { grid-column: 2; grid-row: 1 / 3; align-self: center; color: var(--muted); }
.live-note a { font-size: 13px; grid-column: 1 / -1; }
.instrument { background: var(--surface); padding: 32px 32px 0; border: 1px solid var(--line); border-radius: 4px; overflow: hidden; }
.card-copy { min-height: 208px; }
.card-copy .eyebrow { margin-bottom: 14px; }
.card-copy p:last-child { margin-top: 16px; color: var(--muted); }
.instrument .phone { margin-bottom: 32px; }
.caveat { margin-top: 24px; color: var(--muted); font-size: 13px; max-width: 850px; }
.watch { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 100px; }
.watch h2 { margin-bottom: 24px; }
.watch p:not(.eyebrow) { color: var(--muted); max-width: 440px; }
.watch figure { background: #000; color: #a9b7b3; border-radius: 4px; padding: 35px; }
.watch img { width: 275px; margin: auto; }
.watch figcaption { color: #a9b7b3; justify-content: center; margin-top: 28px; }
.plans { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--line); border-radius: 4px; overflow: hidden; }
.plans article { padding: 36px; }
.pro-plan { border-left: 1px solid var(--line); background: var(--surface); }
ul { padding-left: 1.2rem; }
li { margin-top: 10px; }
li::marker { color: var(--accent); }
.privacy { display: grid; grid-template-columns: 1fr 1fr; column-gap: 100px; }
.privacy > .eyebrow { grid-column: 1 / -1; }
.privacy > div { align-self: end; color: var(--muted); }
.privacy a { display: inline-block; margin-top: 24px; }
.closing { display: flex; align-items: center; gap: 24px; padding-block: 64px; }
.closing img { border-radius: 16px; }
.closing .eyebrow { margin-bottom: 6px; font-size: 10px; }
.closing h2 { font-size: 25px; }
.closing .button { margin-left: auto; }
.site-footer { border-top: 1px solid var(--line); padding-block: 36px; display: flex; justify-content: space-between; gap: 32px; }
.footer-brand { color: var(--ink); font-size: 22px; font-weight: 600; text-decoration: none; }
.footer-brand span { color: var(--accent); }
.site-footer p { font-size: 12px; margin-top: 12px; color: var(--muted); }
.document { max-width: 760px; padding-block: 64px 88px; overflow-wrap: anywhere; }
.document h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); margin-bottom: 24px; }
.document h2 { font-size: 1.5rem; margin: 40px 0 16px; }
.document .updated { font: 12px var(--mono); color: var(--muted); margin-bottom: 32px; }
.document dt { font-weight: 650; margin-top: 24px; }
.document dd { margin: 8px 0 0; color: var(--muted); }
code { font-family: var(--mono); }
.not-found { min-height: 65vh; padding-block: 80px; }
.not-found p:not(.eyebrow) { margin-block: 28px; max-width: 500px; color: var(--muted); }
:lang(zh-Hans) h1, :lang(zh-Hans) h2, :lang(zh-Hans) h3 { line-height: 1.25; letter-spacing: -.025em; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #151918; --surface: #202725; --paper: #edf1ec; --ink: #edf1ec; --muted: #aebbb5; --line: #3d4943; --accent: #66d4d4; }
  .button { color: #142423; }
  .phone { border-color: #67716b; }
}
@media (max-width: 900px) {
  .wrap { width: calc(100% - 48px); }
  .brand span { display: none; }
  .hero { gap: 32px; }
  .hero-visual { padding-inline: 20px; }
  .desktop-break { display: none; }
  .section-heading, .watch, .privacy { column-gap: 40px; }
  .card-copy { min-height: 240px; }
  .closing { flex-wrap: wrap; }
  .closing .button { margin-left: 0; }
  .site-footer { flex-direction: column; gap: 20px; }
}
@media (max-width: 600px) {
  .wrap { width: calc(100% - 40px); }
  .site-header { min-height: 88px; gap: 12px; flex-wrap: wrap; padding-block: 18px; }
  .brand { font-size: 20px; }
  .brand img { width: 30px; height: 30px; }
  nav { gap: 18px; }
  nav a { font-size: 13px; }
  .site-header nav { width: 100%; justify-content: space-between; }
  .hero { grid-template-columns: 1fr; padding-top: 44px; gap: 36px; }
  .hero h1 { font-size: clamp(2.8rem, 9.5vw, 3.6rem); }
  .intro { font-size: 16px; }
  .hero-visual { padding-inline: 24px; }
  .hero-visual .phone { width: 240px; }
  .index-strip { flex-wrap: wrap; gap: 8px; }
  .section { padding-block: 56px; }
  .section-heading, .watch, .privacy, .plans, .instrument-grid { grid-template-columns: 1fr; }
  .section-heading { gap: 20px; }
  .section-heading .eyebrow { margin: 0; }
  .live-note { display: block; padding: 24px; }
  .live-note h3 { margin-block: 14px; }
  .live-note a { display: inline-block; margin-top: 16px; }
  .instrument { padding: 24px 20px 0; }
  .card-copy { min-height: 0; padding-bottom: 28px; }
  .instrument .phone { width: 250px; }
  .watch { gap: 32px; }
  .plans article { padding: 28px; }
  .pro-plan { border-left: 0; border-top: 1px solid var(--line); }
  .privacy > div { margin-top: 28px; }
  .closing { gap: 18px; padding-block: 44px; }
  .closing img { width: 52px; height: 52px; }
  .closing h2 { font-size: 20px; }
  .closing .eyebrow { font-size: 9px; }
  .closing .button { width: 100%; }
  .document { padding-top: 44px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}