/* 长相照 docs/梳理/设计准则/设计准则.md：湖青 · 不铺大块色 · 单元 6 · 胶囊按钮 · 1px 线 · 无阴影 */
@font-face { font-family: "EB Garamond"; font-weight: 500; font-display: swap; src: url(eb-garamond-latin-500-normal.woff2) format("woff2"); }
@font-face { font-family: "Jost"; font-weight: 400; font-display: swap; src: url(jost-latin-400-normal.woff2) format("woff2"); }
@font-face { font-family: "Jost"; font-weight: 500; font-display: swap; src: url(jost-latin-500-normal.woff2) format("woff2"); }
@font-face { font-family: "Noto Serif SC"; font-weight: 400; font-display: swap; src: url(noto-serif-sc-400-sub.woff2) format("woff2"); }
@font-face { font-family: "Noto Serif SC"; font-weight: 500; font-display: swap; src: url(noto-serif-sc-500-sub.woff2) format("woff2"); }
@font-face { font-family: "Noto Serif SC"; font-weight: 600; font-display: swap; src: url(noto-serif-sc-600-sub.woff2) format("woff2"); }

:root {
  --deep: #16434F; --main: #1E9CAC; --btn: #247586; --btn-hover: #1B5F6E; --lightest: #E3F9F9;
  --n900: #1A1E26; --n700: #3A414C; --n600: #5B6371; --n300: #C9CED6; --n200: #E3E6EB; --n100: #EEF0F3; --n50: #F6F7F9; --n0: #fff;
  --serif-zh: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --display: "EB Garamond", "Noto Serif SC", "Songti SC", serif;
  --ui: "Jost", "Noto Serif SC", "Songti SC", sans-serif;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--n0); color: var(--n900); font: 400 16px/1.7 var(--serif-zh); }
html[lang="en"] body { font: 400 16px/1.6 var(--ui); }
img { max-width: 100%; height: auto; }
a { color: var(--btn); text-underline-offset: 3px; }
a:hover { color: var(--btn-hover); }
:focus-visible { outline: 2px solid var(--main); outline-offset: 2px; border-radius: 6px; }

.wrap { max-width: 720px; margin: 0 auto; padding-inline: max(24px, env(safe-area-inset-left)); }
main.wrap { padding-block: 48px 72px; display: grid; gap: 48px; }

/* 页头：不铺色，只一条 1px 线 */
.top { border-bottom: 1px solid var(--n200); }
.top .row { display: flex; align-items: center; gap: 18px; min-height: 60px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--n900); text-decoration: none; font: 500 20px/1 var(--display); }
.nav { margin-left: auto; display: flex; gap: 18px; font: 500 14px/1 var(--ui); }
.nav a, .lang { color: var(--n700); text-decoration: none; }
.nav a:hover, .lang:hover { color: var(--btn); }
.lang { font: 500 14px/1 var(--ui); padding: 6px 12px; border: 1px solid var(--n300); border-radius: 99px; }
html[lang="zh-CN"] .nav, html[lang="zh-CN"] .lang { font-family: var(--serif-zh); font-weight: 500; }

h1, h2, h3 { margin: 0; color: var(--n900); text-wrap: balance; }
h1 { font: 500 clamp(30px, 6.4vw, 42px)/1.2 var(--display); }
html[lang="zh-CN"] h1 { font: 600 clamp(26px, 6vw, 34px)/1.35 var(--serif-zh); }
h2 { font: 500 26px/1.3 var(--display); }
html[lang="zh-CN"] h2 { font: 600 22px/1.4 var(--serif-zh); }
h3 { font: 500 18px/1.4 var(--display); }
html[lang="zh-CN"] h3 { font: 600 16px/1.5 var(--serif-zh); }
.lead { margin: 18px 0 0; font-size: 18px; color: var(--n700); }
.hero { display: grid; gap: 6px; justify-items: start; padding-top: 12px; }
.hero-icon { border-radius: 22px; margin-bottom: 18px; }
.block { display: grid; gap: 18px; }
.block p { margin: 0; color: var(--n700); }

/* 按钮：胶囊、高 48；主按钮是「一个按钮」的实底，不算大块 */
.btn { display: inline-flex; flex-direction: column; justify-content: center; align-items: center; min-height: 48px; padding: 6px 24px; border-radius: 99px; text-decoration: none; text-align: center; font: 500 15px/1.25 var(--ui); }
html[lang="zh-CN"] .btn { font-family: var(--serif-zh); font-weight: 500; }
.btn small { font-size: 13px; font-weight: 500; }
.btn-main { background: var(--btn); color: #fff; border: 1px solid var(--btn); }
.btn-main:hover { background: var(--btn-hover); border-color: var(--btn-hover); color: #fff; }
.btn-sub { background: var(--n0); color: var(--deep); border: 1px solid var(--n300); }
.btn-sub:hover { border-color: #9AA1AC; background: var(--n50); color: var(--deep); }
.btn-off { background: var(--n100); color: #5B6371; border: 1px solid var(--n200); cursor: default; }

/* 卡片：一道 1px 线，圆角 12，无阴影，不铺色 */
.cols { display: grid; gap: 12px; grid-template-columns: 1fr 1fr; }
.card { border: 1px solid var(--n200); border-radius: 12px; padding: 24px; display: grid; gap: 12px; align-content: start; }
.card .btn { width: 100%; }
.note { margin: 0; font-size: 14px; color: var(--n600); }
.more { border: 1px solid var(--n200); border-radius: 12px; padding: 12px 24px; }
.more summary { cursor: pointer; min-height: 36px; display: flex; align-items: center; font-weight: 500; color: var(--n900); }
.more-body { display: grid; gap: 12px; padding-block: 6px 12px; }
.more h3 { margin-top: 12px; }
.more p { margin: 0; color: var(--n700); }
.stack { display: grid; gap: 12px; justify-items: start; }

.points { list-style: none; margin: 0; padding: 0; display: grid; gap: 24px; }
.points li { border-left: 2px solid var(--n200); padding-left: 18px; }
.points p { margin: 6px 0 0; color: var(--n700); }
.work { display: flex; gap: 18px; align-items: center; border: 1px solid var(--n200); border-radius: 12px; padding: 18px 24px; color: var(--n700); text-decoration: none; }
.work:hover { border-color: var(--n300); }
.work strong { color: var(--n900); font-weight: 600; }

/* 协议正文 */
.legal { display: grid; gap: 12px; }
.legal h1 { margin-bottom: 6px; }
.legal h2 { margin-top: 24px; font-size: 22px; }
html[lang="zh-CN"] .legal h2 { font-size: 20px; }
.legal h3 { margin-top: 12px; }
.legal p { margin: 0; color: var(--n700); }
.legal strong { color: var(--n900); font-weight: 600; }
.legal hr { border: 0; border-top: 1px solid var(--n200); margin: 12px 0; }
.legal-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.legal-list li { display: flex; gap: 12px; color: var(--n700); }
.legal-list .mark { flex: 0 0 auto; min-width: 1.4em; color: var(--n600); font-variant-numeric: tabular-nums; }
.draft { font-size: 14px; color: var(--n600); border: 1px solid var(--n200); border-radius: 12px; padding: 6px 18px; justify-self: start; }
.tbl { overflow-x: auto; border: 1px solid var(--n200); border-radius: 12px; }
.tbl table { border-collapse: collapse; width: 100%; font-size: 14px; min-width: 520px; }
.tbl th, .tbl td { text-align: left; padding: 12px 18px; vertical-align: top; border-top: 1px solid var(--n200); }
.tbl thead th { border-top: 0; color: var(--n900); font-weight: 600; }

.foot { border-top: 1px solid var(--n200); }
.foot .wrap { padding-block: 24px 36px; display: grid; gap: 6px; font-size: 14px; color: var(--n600); }
.foot p { margin: 0; }
.foot a { color: var(--n700); }

@media (max-width: 560px) {
  .cols { grid-template-columns: 1fr; }
  main.wrap { padding-block: 36px 48px; gap: 36px; }
  .top .row { flex-wrap: wrap; row-gap: 6px; padding-block: 6px; }
  .nav { margin-left: 0; order: 3; width: 100%; }
}
@media (prefers-reduced-motion: no-preference) { a, .btn { transition: color .15s, background-color .15s, border-color .15s; } }
/* 邀请页（RT-90）：码那一格 · 窄屏不撑宽 */
.invite { grid-template-columns: minmax(0, 1fr); }
.invite .code-box { display: flex; align-items: baseline; gap: 12px; padding: 12px 18px; border: 1px solid var(--n200); border-radius: 12px; }
.invite .code-box strong { font: 500 24px/1.2 var(--ui); letter-spacing: 0.12em; font-variant-numeric: lining-nums tabular-nums; }