:root {
  --ink: #1d1a16;
  --ink-soft: #4a443b;
  --ink-muted: #696154;
  --night: #14110d;
  --paper: #f3efe7;
  --white: #fdfbf7;
  --jade: #0f6e58;
  --jade-light: #6fd0b4;
  --line: rgba(29, 26, 22, .15);
  --display: "Songti SC", "Noto Serif SC", STSong, serif;
  --body: "PingFang SC", "Noto Sans SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 24px; -webkit-text-size-adjust: 100%; scrollbar-color: #9a9284 var(--paper); }
body { margin: 0; min-width: 320px; background: var(--paper); color: var(--ink); font: 16px/1.8 var(--body); -webkit-font-smoothing: antialiased; }
h1, h2, h3, p, figure { margin: 0; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .22em; }
a:hover { color: var(--jade); }
::selection { background: #cfe9df; color: var(--night); }
:focus-visible { outline: 3px solid var(--jade); outline-offset: 5px; border-radius: 4px; }
.shell { width: min(1120px, calc(100% - 40px)); margin-inline: auto; }
.skip-link { position: absolute; z-index: 10; top: 10px; left: 10px; padding: 10px 16px; background: var(--night); color: var(--white); transform: translateY(-160%); }
.skip-link:focus { transform: none; color: var(--white); }
.page-header { border-bottom: 1px solid var(--line); }
.header-inner { display: flex; justify-content: space-between; align-items: center; min-height: 88px; gap: 24px; }
.brand { display: flex; align-items: center; gap: 10px; font-size: 21px; font-weight: 800; text-decoration: none; }
.brand img { border-radius: 9px; }
.header-inner nav { display: flex; align-items: center; gap: 26px; font-size: 14px; }
.header-inner nav > a { text-decoration: none; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 52px; padding: 12px 22px; background: var(--night); color: var(--white); border-radius: 13px; font-size: 16px; font-weight: 700; line-height: 1.5; text-decoration: none; transition: background .18s ease-out; }
.button:hover { background: var(--jade); color: var(--white); }
.button-small { min-height: 44px; padding: 10px 16px; font-size: 14px; }
.button-light { background: var(--paper); color: var(--ink); }
.button-light:focus-visible { outline-color: var(--jade-light); }
.breadcrumb { display: flex; gap: 12px; flex-wrap: wrap; padding-block: 24px; color: var(--ink-muted); font-size: 14px; }
.breadcrumb a { color: var(--jade); }
.page-hero { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: clamp(40px, 7vw, 112px); align-items: center; padding: 32px 0 72px; }
h1 { max-width: 15em; font-family: var(--display); font-size: clamp(36px, 4.2vw, 58px); line-height: 1.25; font-weight: 800; letter-spacing: -.025em; text-wrap: balance; }
.intro { margin-top: 26px; color: var(--ink-soft); font-size: 18px; line-height: 1.9; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 20px; margin-top: 30px; }
.text-link { color: var(--jade); font-weight: 700; padding-block: 10px; }
.platform-note { margin-top: 20px; font-size: 13px; color: var(--ink-muted); }
.hero-figure { display: grid; justify-items: center; gap: 20px; }
.phone { width: 246px; padding: 7px; border-radius: 37px; background: #1b1814; box-shadow: 0 30px 48px -24px rgba(20, 15, 8, .38); }
.phone img { width: 100%; border-radius: 30px; }
figcaption { max-width: 26em; text-align: center; color: var(--ink-muted); font-size: 13px; }
.reading-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 72px; padding: 56px 0 72px; border-top: 1px solid var(--line); }
.contents { position: sticky; top: 28px; align-self: start; display: grid; gap: 7px; font-size: 14px; }
.contents p { margin-bottom: 8px; font-weight: 800; }
.contents a { padding-block: 5px; color: var(--ink-soft); text-decoration: none; line-height: 1.6; }
.contents a:hover { color: var(--jade); text-decoration: underline; }
.article-body { min-width: 0; max-width: 72ch; }
.article-body section + section { margin-top: 56px; }
h2 { font-family: var(--display); font-size: clamp(26px, 2.6vw, 34px); font-weight: 800; line-height: 1.4; letter-spacing: -.015em; text-wrap: balance; }
.article-body p { margin-top: 18px; color: var(--ink-soft); line-height: 1.95; }
.article-list { padding-left: 1.3em; margin: 22px 0 0; color: var(--ink-soft); }
.article-list li { padding-left: .3em; margin-top: 12px; }
.article-list li::marker { color: var(--jade); }
.article-steps { padding-left: 1.5em; margin: 26px 0 0; }
.article-steps li { padding-left: .65em; margin-top: 24px; }
.article-steps li::marker { font-weight: 800; color: var(--jade); }
h3 { font-size: 18px; font-weight: 750; line-height: 1.6; }
.article-steps p { margin-top: 6px; }
.table-wrap { margin-top: 24px; }
table { width: 100%; border-collapse: collapse; font-size: 15px; font-variant-numeric: tabular-nums; }
caption { text-align: left; margin-bottom: 12px; color: var(--ink-muted); font-size: 13px; }
th, td { padding: 15px 12px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); overflow-wrap: anywhere; }
thead th { background: #e5ede8; font-weight: 750; }
tbody th { width: 32%; font-weight: 600; }
td { color: var(--ink-soft); }
.faq details { border-bottom: 1px solid var(--line); padding-block: 20px; }
.faq h2 { margin-bottom: 8px; }
.faq summary { cursor: pointer; font-weight: 700; padding-right: 10px; }
.faq summary::marker { color: var(--jade); }
.faq details p { margin-top: 12px; }
.related { padding: 40px 0 72px; border-top: 1px solid var(--line); }
.related nav { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; margin-top: 24px; }
.related a { padding-block: 12px; border-bottom: 1px solid var(--line); text-decoration: none; }
.related strong { display: block; color: var(--jade); font-size: 18px; }
.related span { display: block; margin-top: 8px; color: var(--ink-soft); font-size: 14px; }
.related a:hover strong { text-decoration: underline; }
.download { padding-block: 56px; background: var(--night); color: var(--white); }
.download-inner { display: flex; justify-content: space-between; align-items: center; gap: 32px; }
.download p { margin-top: 12px; color: #cec6b9; }
.page-footer { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 20px; padding-block: 30px; color: var(--ink-muted); font-size: 12px; }
.page-footer nav { display: flex; flex-wrap: wrap; gap: 20px; }
.not-found { padding-block: 96px; max-width: 760px; }
.not-found p { margin: 24px 0 32px; color: var(--ink-soft); }
@media (max-width: 900px) {
  .page-hero { grid-template-columns: minmax(0, 1fr) 240px; gap: 32px; }
  .phone { width: 212px; border-radius: 32px; }
  .phone img { border-radius: 25px; }
  .reading-layout { grid-template-columns: 170px minmax(0, 1fr); gap: 32px; }
  .header-inner nav { gap: 20px; }
}
@media (max-width: 640px) {
  .shell { width: calc(100% - 36px); }
  .header-inner { min-height: 74px; gap: 16px; }
  .header-inner nav { gap: 12px; }
  .header-inner nav > a:not(.button) { display: none; }
  .page-hero { grid-template-columns: minmax(0, 1fr); gap: 36px; padding: 22px 0 44px; }
  h1 { font-size: 36px; }
  .intro { font-size: 17px; margin-top: 22px; }
  .hero-actions { gap: 14px; }
  .hero-figure .phone { width: 205px; }
  .reading-layout { grid-template-columns: minmax(0, 1fr); padding: 32px 0 48px; gap: 40px; }
  .contents { position: static; padding-bottom: 24px; border-bottom: 1px solid var(--line); }
  .contents a { padding-block: 7px; }
  .article-body section + section { margin-top: 40px; }
  .related { padding-bottom: 48px; }
  .related nav { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  .download-inner { align-items: flex-start; flex-direction: column; }
  th, td { padding: 12px 8px; font-size: 14px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button { transition: none; }
}