:root {
  --paper: #fff9ed;
  --ink: #17213d;
  --muted: #555d70;
  --coral: #ba432e;
  --cream: #fff5db;
  --line: #d9d2c5;
  --blue: #c2e0fc;
  --white: #ffffff;
  --display: "Baskerville", "Songti SC", "Noto Serif CJK SC", Georgia, serif;
  --body: "Avenir Next", "PingFang SC", "Hiragino Sans GB", sans-serif;
  --s1: 4px; --s2: 8px; --s3: 12px; --s4: 16px;
  --s5: 24px; --s6: 32px; --s7: 48px; --s8: 64px;
  --radius: 24px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 24px; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 17px/1.7 var(--body); }
body, h1, h2, h3, p, figure { margin: 0; }
a { color: inherit; text-underline-offset: 5px; text-decoration-thickness: 1px; }
button, summary { font: inherit; }
a, button, summary { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--coral); outline-offset: 5px; }
::selection { background: var(--ink); color: var(--paper); }
img { display: block; max-width: 100%; height: auto; }
svg { display: block; }
.wrap { width: min(1160px, calc(100% - 64px)); margin-inline: auto; }
.skip { position: fixed; z-index: 20; left: 16px; top: -100px; padding: 12px 24px; background: var(--ink); color: var(--white); }
.skip:focus { top: 8px; }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-block: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; min-height: 44px; flex-shrink: 0; }
.brand-name { font-size: 25px; line-height: 1.1; letter-spacing: -.025em; font-weight: 700; }
.brand-note { font-size: 12px; font-weight: 500; letter-spacing: .1em; margin-top: 4px; display: block; }
.brand-mark { width: 32px; height: 32px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 4px; transform: rotate(-8deg); }
.brand-mark i { background: var(--coral); border-radius: 5px; }
.brand-mark i:first-child { grid-row: span 2; }
.navigation { display: flex; align-items: center; flex-wrap: wrap; justify-content: flex-end; gap: 8px 24px; }
.navigation a { display: inline-flex; align-items: center; min-height: 44px; text-decoration: none; font-size: 15px; }
.navigation a[aria-current="page"] { text-decoration: underline; }
.navigation .language { padding-inline-start: 24px; border-inline-start: 1px solid var(--line); }
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: center; gap: 64px; padding-block: 32px 48px; }
.eyebrow { font-size: 13px; letter-spacing: .12em; font-weight: 600; text-transform: uppercase; color: var(--coral); margin-bottom: 24px; }
h1, h2, h3 { font-family: var(--display); font-weight: 600; }
.hero h1 { font-size: clamp(48px, 6.1vw, 82px); line-height: 1.1; letter-spacing: -.045em; max-width: 100%; }
html[lang="zh-Hans"] .hero h1 { max-width: 100%; line-height: 1.22; letter-spacing: -.055em; }
.hero .lead { max-width: 34ch; margin-top: 24px; color: var(--muted); font-size: 18px; line-height: 1.75; }
.actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px 24px; margin-top: 32px; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 52px; padding: 12px 24px; gap: 12px; background: var(--ink); color: var(--paper); border: 1px solid var(--ink); border-radius: 12px; text-decoration: none; font-weight: 600; font-size: 16px; transition: transform 160ms, background-color 160ms; }
.text-link { display: inline-flex; align-items: center; min-height: 44px; gap: 8px; font-size: 16px; }
.hero-footnote { font-size: 13px; color: var(--muted); margin-top: 24px; }
.hero-picture { min-width: 0; }
.hero-stage { position: relative; aspect-ratio: 3 / 4; isolation: isolate; display: flex; justify-content: center; align-items: flex-start; border-radius: var(--radius); overflow: hidden; background: var(--ink); padding-top: 32px; }
.plate { position: absolute; inset: 0; z-index: -1; width: 100%; height: 100%; object-fit: cover; object-position: center bottom; }
.phone { width: 48%; border: 6px solid #111626; border-radius: 28px; overflow: hidden; background: #111626; box-shadow: 0 16px 40px #0006; }
.phone img { width: 100%; }
.hero-picture figcaption { color: var(--muted); font-size: 12px; padding-top: 12px; text-align: center; }
.principles { display: flex; justify-content: space-between; gap: 24px; padding-block: 24px; border-block: 1px solid var(--line); list-style: none; margin: 0; }
.principles li { display: flex; align-items: baseline; gap: 12px; min-width: 0; font-size: 15px; }
.principles span { color: var(--coral); font-family: var(--display); font-size: 20px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 32px; margin-bottom: 32px; }
.section-heading h2 { font-size: clamp(30px, 3.5vw, 44px); line-height: 1.25; letter-spacing: -.025em; }
.section-heading p { max-width: 34ch; color: var(--muted); font-size: 16px; }
.how { padding-block: 64px; }
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; padding: 0; margin: 0; list-style: none; counter-reset: start; }
.steps li { border-top: 1px solid var(--line); padding-top: 24px; }
.steps li::before { counter-increment: start; content: "0" counter(start); display: block; font: italic 26px/1 var(--display); color: var(--coral); margin-bottom: 16px; }
.steps h3 { font-size: 26px; line-height: 1.25; margin-bottom: 12px; }
.steps p { max-width: 36ch; color: var(--muted); font-size: 16px; }
.feature-pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.art-note { position: relative; isolation: isolate; min-height: 620px; padding: 32px; border-radius: var(--radius); overflow: hidden; background: var(--cream); }
.art-note h2 { max-width: 100%; font-size: clamp(30px, 3.2vw, 40px); line-height: 1.25; letter-spacing: -.025em; }
.art-note p { max-width: 36ch; font-size: 17px; margin-top: 16px; }
.art-note .eyebrow { margin-bottom: 16px; }
.art-note.blue { background: var(--blue); }
.art-note.blue .eyebrow { color: var(--ink); }
.closing { margin-top: 64px; padding: 48px; background: var(--ink); color: var(--cream); border-radius: var(--radius); display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 48px; align-items: center; }
.closing h2 { font-size: 40px; line-height: 1.25; letter-spacing: -.025em; max-width: 15ch; }
.closing p { font-size: 16px; line-height: 1.75; }
.closing .text-link { margin-top: 16px; }
.closing :focus-visible { outline-color: var(--cream); }
.site-footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 24px 48px; padding-block: 48px 32px; color: var(--muted); font-size: 14px; }
.site-footer .footer-links { display: flex; flex-wrap: wrap; gap: 8px 24px; align-items: start; }
.site-footer a { display: inline-flex; align-items: center; min-height: 44px; }
.footer-legal p { font-size: 14px; }
.doc-heading { padding-block: 48px; max-width: 760px; }
.doc-heading h1 { font-size: clamp(40px, 5vw, 64px); line-height: 1.2; letter-spacing: -.035em; }
.doc-heading .intro { margin-top: 24px; color: var(--muted); font-size: 19px; max-width: 60ch; }
.updated { color: var(--muted); font-size: 14px; margin-top: 16px; }
.document-layout { display: grid; grid-template-columns: minmax(0, 760px) minmax(180px, 1fr); gap: 64px; align-items: start; }
.document-body { min-width: 0; }
.document-body section { margin-bottom: 48px; }
.document-body h2 { font-size: 28px; line-height: 1.3; margin-bottom: 16px; letter-spacing: -.015em; }
.document-body p { font-size: 17px; line-height: 1.85; margin-top: 16px; max-width: 70ch; overflow-wrap: anywhere; }
.document-body p:first-of-type { margin-top: 0; }
.document-body a { color: var(--coral); }
.toc { position: sticky; top: 24px; border-top: 1px solid var(--line); padding-top: 16px; }
.toc summary { cursor: pointer; min-height: 44px; font-size: 15px; font-weight: 600; }
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc a { display: flex; align-items: center; min-height: 44px; font-size: 14px; text-decoration: none; padding-block: 8px; }
.contact-panel { padding: 24px 32px; background: var(--ink); color: var(--cream); border-radius: 16px; margin-bottom: 48px; }
.contact-panel h2 { font-size: 28px; margin-bottom: 8px; }
.contact-panel p { color: var(--cream); font-size: 16px; max-width: 62ch; }
.contact-panel .email { display: inline-flex; align-items: center; min-height: 44px; font-size: 22px; margin-top: 12px; color: var(--cream); overflow-wrap: anywhere; }
.contact-panel :focus-visible { outline-color: var(--cream); }
.operator { padding-top: 24px; border-top: 1px solid var(--line); }
.operator p { font-size: 15px; }
@media (hover: hover) and (pointer: fine) {
  .button:hover { background: var(--coral); border-color: var(--coral); transform: translateY(-2px); }
  .navigation a:hover, .toc a:hover, .site-footer a:hover { text-decoration: underline; }
}
.button:active { transform: translateY(1px); }
@media (max-width: 900px) {
  .hero { gap: 32px; }
  .hero h1 { font-size: 58px; }
  .hero-stage { padding-top: 24px; }
  .phone { border-width: 4px; border-radius: 20px; }
  .document-layout { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .toc { position: static; grid-row: 1; }
  .toc ol { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 24px; }
  .art-note { min-height: 620px; padding: 24px; }
  .art-note h2 { font-size: 34px; }
}
@media (max-width: 640px) {
  .wrap { width: calc(100% - 32px); }
  .site-header { gap: 8px 16px; flex-wrap: wrap; padding-block: 16px; }
  .navigation { gap: 4px 16px; justify-content: flex-start; }
  .navigation .language { padding-inline-start: 16px; }
  .navigation a { font-size: 14px; }
  .hero { grid-template-columns: minmax(0, 1fr); gap: 32px; padding-top: 32px; }
  .hero h1 { font-size: clamp(48px, 12.5vw, 64px); max-width: 100%; }
  html[lang="zh-Hans"] .hero h1 { max-width: 100%; }
  .hero .eyebrow { margin-bottom: 16px; }
  .hero .lead { margin-top: 16px; font-size: 17px; max-width: 34ch; }
  .actions { margin-top: 24px; }
  .hero-footnote { margin-top: 16px; }
  .hero-stage { aspect-ratio: 3 / 4; }
  .hero-picture { width: min(440px, 100%); justify-self: center; }
  .principles { flex-direction: column; gap: 8px; padding-block: 16px; }
  .principles li { font-size: 15px; }
  .section-heading { display: block; }
  .section-heading p { margin-top: 16px; }
  .how { padding-block: 48px; }
  .steps { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .steps li { padding-top: 16px; }
  .steps li::before { margin-bottom: 12px; }
  .steps h3 { font-size: 26px; }
  .feature-pair { grid-template-columns: minmax(0, 1fr); }
  .art-note { min-height: 580px; }
  .art-note h2 { font-size: 32px; max-width: 100%; }
  .art-note p { font-size: 16px; max-width: 32ch; }
  .closing { margin-top: 48px; padding: 32px 24px; grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .closing h2 { font-size: 34px; }
  .site-footer { padding-top: 32px; }
  .doc-heading { padding-block: 32px; }
  .doc-heading .intro { font-size: 18px; }
  .toc ol { grid-template-columns: minmax(0, 1fr); }
  .contact-panel { padding: 24px; margin-bottom: 32px; }
  .document-body section { margin-bottom: 32px; }
  .document-body p { font-size: 17px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}