/* 语宙一站式写作 官网
   视觉：产品流线纸面 + 宣传片合成页（纸、墨、石榴红；宋体标题；等宽批注；1px 墨线与硬阴影）
   结构：开场星环 + 已维护天数 → 团队介绍 → 方法参考 */
/* 字体全部随网站本地提供（不连 Google）：Mac 先用系统宋体，其余系统用思源宋体子集（开发/生成字体子集.py） */
@font-face { font-family: "Yuzhou Site Serif"; src: url("assets/fonts/site-serif-400.woff2") format("woff2"); font-weight: 400 500; font-display: swap; }
@font-face { font-family: "Yuzhou Site Serif"; src: url("assets/fonts/site-serif-600.woff2") format("woff2"); font-weight: 600 900; font-display: swap; }
@font-face { font-family: "Space Mono"; src: url("assets/fonts/SpaceMono-Regular.woff2") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Space Mono"; src: url("assets/fonts/SpaceMono-Bold.woff2") format("woff2"); font-weight: 700; font-display: swap; }
:root {
  --ink: #000;
  --paper: #fff;
  --zhu: #8e2b3f;
  --ink-80: rgba(0, 0, 0, .8);
  --ink-60: rgba(0, 0, 0, .6);
  --ink-45: rgba(0, 0, 0, .45);
  --ink-30: rgba(0, 0, 0, .3);
  --ink-15: rgba(0, 0, 0, .15);
  --ink-08: rgba(0, 0, 0, .08);
  --sheet: #fbfaf7;
  --song: "Songti SC", "STSong", "Yuzhou Site Serif", "SimSun", serif;
  --mono: "Space Mono", "SF Mono", Menlo, Consolas, monospace;
  --shadow: 6px 6px 0 var(--ink);
  --shadow-sm: 3px 3px 0 var(--ink);
  --site: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; background: var(--paper); }
body { margin: 0; color: var(--ink); font: 400 15.5px/1.8 var(--song); letter-spacing: .02em; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
h1, h2, h3, h4, p, ol, ul, figure { margin: 0; padding: 0; }
ol, ul { list-style: none; }
svg[data-icon] { fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.paper { position: fixed; inset: 0; width: 100vw; height: 100vh; z-index: 0; pointer-events: none; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* ---------- 导航 ---------- */
.nav { position: fixed; top: 14px; left: 0; right: 0; z-index: 50; padding: 0 16px; transition: opacity .6s ease, transform .6s ease; }
.is-intro .nav { opacity: 0; transform: translateY(-12px); pointer-events: none; }
.nav-card {
  display: flex; align-items: center; gap: 28px;
  width: min(var(--site), 100%); margin: 0 auto; height: 56px; padding: 0 18px;
  background: rgba(255, 255, 255, .94); backdrop-filter: blur(8px);
  border: 1px solid var(--ink); box-shadow: var(--shadow-sm);
}
.brand { display: flex; align-items: center; gap: 10px; font: 700 17px/1 var(--song); letter-spacing: .06em; white-space: nowrap; }
.brand-seal {
  display: inline-grid; place-items: center; width: 26px; height: 26px; background: var(--zhu); color: var(--paper);
  font: 700 10px/1.05 var(--song); font-style: normal; writing-mode: vertical-rl; letter-spacing: .05em;
}
.nav-links { display: flex; gap: 24px; margin-left: auto; font-size: 14.5px; letter-spacing: .12em; }
.nav-links a { position: relative; padding: 6px 0; color: var(--ink-80); }
.nav-links a:hover, .nav-links a.is-on { color: var(--ink); }
.nav-links a::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: var(--zhu); transform: scaleX(0); transform-origin: 0 50%; transition: transform .25s ease; }
.nav-links a:hover::after, .nav-links a.is-on::after { transform: scaleX(1); }
.nav-maint { display: flex; align-items: baseline; gap: 6px; padding-left: 22px; border-left: 1px solid var(--ink); font-size: 13px; letter-spacing: .1em; white-space: nowrap; }
.nav-maint b { font: 700 18px/1 var(--mono); color: var(--zhu); }
.nav-toggle { display: none; }

/* ---------- 开场横幅 ---------- */
.banner { position: relative; z-index: 1; height: 100vh; min-height: 600px; overflow: hidden; }
.cosmos { position: absolute; inset: 0; width: 100%; height: 100%; cursor: pointer; }
.banner-copy {
  position: absolute; left: 0; right: 0; bottom: 9vh; text-align: center; pointer-events: none;
  opacity: 0; transform: translateY(14px); transition: opacity 1s ease, transform 1s ease;
}
.is-titled .banner-copy { opacity: 1; transform: none; }
.banner-sub { font: 400 clamp(18px, 2vw, 26px)/1.5 var(--song); letter-spacing: .16em; }
.maint {
  display: inline-flex; flex-direction: column; align-items: center; gap: 6px;
  margin-top: 26px; padding: 16px 30px 14px; background: var(--paper);
  border: 1px solid var(--ink); box-shadow: 5px 5px 0 var(--ink);
}
.maint-label { font: 400 10.5px/1 var(--mono); letter-spacing: .28em; color: var(--ink-45); }
.maint-days { display: flex; align-items: baseline; gap: 10px; font: 700 18px/1 var(--song); letter-spacing: .14em; }
.maint-days b { font: 700 52px/1 var(--mono); letter-spacing: -.02em; color: var(--zhu); }
.maint-tick { font: 400 12px/1.4 var(--mono); letter-spacing: .1em; color: var(--ink-60); font-variant-numeric: tabular-nums; }
.banner-down {
  position: absolute; right: 28px; bottom: 22px;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  font: 400 10px/1 var(--mono); letter-spacing: .3em; color: var(--ink-45);
  opacity: 0; transition: opacity 1s ease .4s;
}
.is-titled .banner-down { opacity: 1; }
.banner-down span { width: 1px; height: 28px; background: var(--ink); animation: drip 1.8s ease-in-out infinite; transform-origin: 50% 0; }
@keyframes drip { 0% { transform: scaleY(0); } 50% { transform: scaleY(1); } 100% { transform: scaleY(1); opacity: 0; } }

/* ---------- 正文：卡片 + 左侧轴线 ---------- */
.site { position: relative; z-index: 1; width: min(var(--site), calc(100% - 32px)); margin: 0 auto; padding: 40px 0 80px; }
.site::before { content: ""; position: absolute; left: -46px; top: 40px; bottom: 80px; width: 1px; background: var(--ink-15); }
.card {
  position: relative; margin-bottom: 40px; padding: 40px 44px 44px;
  background: var(--paper); border: 1px solid var(--ink); box-shadow: var(--shadow);
}
.card-mark {
  position: absolute; left: -60px; top: 34px; width: 29px; height: 29px;
  display: grid; place-items: center; background: var(--paper); border: 1px solid var(--ink);
}
.card-mark svg { width: 15px; height: 15px; }
.card.is-current .card-mark { background: var(--ink); color: var(--paper); }
.card-head { max-width: 780px; margin-bottom: 30px; }
.eyebrow { font: 400 11px/1 var(--mono); letter-spacing: .26em; color: var(--zhu); }
.card h2 { margin-top: 14px; font: 700 clamp(26px, 3vw, 36px)/1.3 var(--song); letter-spacing: .08em; }
.lead { margin-top: 12px; color: var(--ink-60); font-size: 16px; }
.placeholder { color: var(--ink-30); }

/* ---------- 两个版本 ---------- */
.eds { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.ed { position: relative; display: flex; flex-direction: column; padding: 26px 26px 24px; border: 1px solid var(--ink); background: var(--paper); }
.ed-ob { box-shadow: var(--shadow-sm); }
.ed-ob::before { content: ""; position: absolute; left: -1px; right: -1px; top: -1px; height: 5px; background: var(--zhu); }
.ed h3 { margin-top: 0; font: 700 28px/1.2 var(--song); letter-spacing: .06em; }
.ed-tag { margin-top: 8px; padding-bottom: 16px; border-bottom: 1px solid var(--ink); font-size: 14.5px; letter-spacing: .12em; color: var(--zhu); }
.ed-fit { flex: 1; margin-top: 16px; font-size: 14.5px; color: var(--ink-80); }
.ed-fit b { display: block; margin-bottom: 4px; font: 700 13px/1.6 var(--song); letter-spacing: .14em; color: var(--ink); }
.get { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 18px; margin-top: 24px; padding: 14px 18px; border: 1px solid var(--ink); background: var(--sheet); }
.get-label { padding: 4px 12px; background: var(--ink); color: var(--paper); font: 700 14px/1.5 var(--song); letter-spacing: .2em; }
.get-text { font-size: 15.5px; letter-spacing: .06em; }
.get-text b { color: var(--zhu); }
.get-seal { padding: 4px 12px; border: 1px solid var(--zhu); color: var(--zhu); font: 700 13px/1.5 var(--song); letter-spacing: .14em; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  height: 42px; padding: 0 22px; border: 1px solid var(--ink); box-shadow: var(--shadow-sm);
  font: 700 15px/1 var(--song); letter-spacing: .12em; cursor: pointer;
  transition: transform .12s ease, box-shadow .12s ease, background .12s ease;
}
.btn:hover { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--ink); }
.btn-ink { background: var(--ink); color: var(--paper); }
.btn-ink:hover { background: var(--zhu); }
.btn-sm { height: 32px; padding: 0 14px; font-size: 13.5px; box-shadow: 2px 2px 0 var(--zhu); }
.cmp { margin-top: 28px; border: 1px solid var(--ink); }
.cmp-row { display: grid; grid-template-columns: 200px 1fr 1fr; border-top: 1px solid var(--ink-15); }
.cmp-row > span { padding: 14px 18px; font-size: 14px; line-height: 1.75; color: var(--ink-80); }
.cmp-row > span + span { border-left: 1px solid var(--ink-15); }
.cmp-row > span:last-child { background: rgba(142, 43, 63, .035); }
.cmp-row b { display: block; margin-bottom: 2px; font: 700 15px/1.6 var(--song); color: var(--ink); letter-spacing: .04em; }
.cmp-row [role="rowheader"] { font: 700 15px/1.6 var(--song); color: var(--ink); letter-spacing: .06em; }
.cmp-row [role="rowheader"] i { display: block; font: 400 11px/1.6 var(--mono); font-style: normal; color: var(--zhu); letter-spacing: .14em; }
.cmp-head { border-top: 0; background: var(--ink); }
.cmp-head > span, .cmp-head > span:last-child { padding: 10px 18px; background: none; color: var(--paper); font: 700 14px/1.5 var(--song); letter-spacing: .14em; }
.cmp-head > span + span { border-color: rgba(255, 255, 255, .25); }
.note { margin-top: 16px; font-size: 13px; color: var(--ink-45); }

/* ---------- 维护记录 ---------- */
.zhu-num { font-family: var(--mono); color: var(--zhu); }
.timeline { position: relative; margin-left: 6px; }
.timeline::before { content: ""; position: absolute; left: 118px; top: 8px; bottom: 8px; width: 1px; background: var(--ink); }
.timeline li { position: relative; display: grid; grid-template-columns: 104px 120px 1fr; gap: 0 28px; align-items: baseline; padding: 12px 0; }
.timeline li::before { content: ""; position: absolute; left: 114px; top: 20px; width: 9px; height: 9px; background: var(--paper); border: 1px solid var(--ink); }
.timeline time { font: 400 12.5px/1.6 var(--mono); letter-spacing: .06em; color: var(--ink-60); text-align: right; }
.trk { justify-self: start; padding: 1px 9px; border: 1px solid var(--ink); font: 400 12px/1.6 var(--song); letter-spacing: .08em; white-space: nowrap; }
.trk-ob { border-color: var(--zhu); color: var(--zhu); }
.timeline h4 { font: 700 16px/1.5 var(--song); letter-spacing: .08em; }
.timeline li p { margin-top: 2px; font-size: 14px; color: var(--ink-60); }
.tl-now::before { background: var(--zhu) !important; border-color: var(--zhu) !important; animation: beat 1.6s ease-in-out infinite; }
@keyframes beat { 50% { transform: scale(1.35); } }
.trk-now { background: var(--zhu); border-color: var(--zhu); color: var(--paper); }
.tl-now p { font-family: var(--mono); font-size: 12.5px; letter-spacing: .06em; font-variant-numeric: tabular-nums; }

/* ---------- 常见问题 ---------- */
.faq details { border-top: 1px solid var(--ink); }
.faq details:last-child { border-bottom: 1px solid var(--ink); }
.faq summary { list-style: none; cursor: pointer; position: relative; padding: 16px 40px 16px 0; font: 700 16px/1.5 var(--song); letter-spacing: .06em; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 6px; top: 12px; font: 400 22px/1 var(--mono); transition: transform .2s ease; }
.faq details[open] summary::after { transform: rotate(45deg); color: var(--zhu); }
.faq details p { padding: 0 40px 18px 0; font-size: 15px; color: var(--ink-60); }


/* ---------- 团队 ---------- */
.team-intro { max-width: 860px; padding: 4px 0 4px 26px; border-left: 3px solid var(--zhu); }
.team-intro p { font-size: 17.5px; line-height: 2.1; letter-spacing: .06em; color: var(--ink); text-align: justify; }
.team-intro p + p { margin-top: 14px; font-size: 15.5px; color: var(--ink-60); }

/* ---------- 方法参考 ---------- */
.trio { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--ink); border: 1px solid var(--ink); }
.trio-item { background: var(--paper); padding: 18px 20px 20px; }
.trio-item p { margin-top: 10px; font-size: 14.5px; color: var(--ink-80); }
.tag-zhu { display: inline-block; padding: 3px 10px; background: var(--zhu); color: var(--paper); font: 700 14px/1.5 var(--song); letter-spacing: .14em; }

.practice { display: grid; grid-template-columns: 150px 1fr; gap: 20px; margin-top: 30px; padding: 22px 24px; background: var(--sheet); border: 1px solid var(--ink-15); }
.practice-label { font: 700 17px/1.5 var(--song); letter-spacing: .14em; color: var(--zhu); }
.practice-list { display: grid; gap: 12px; }
.practice-list li { font-size: 15px; color: var(--ink-80); }
.practice-list b { display: inline-block; min-width: 7.5em; margin-right: 8px; color: var(--ink); letter-spacing: .08em; }

.ref-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; margin-top: 40px; }
.ref-count { font: 400 12px/1 var(--mono); letter-spacing: .14em; color: var(--ink-45); }
.seg { display: inline-flex; flex-wrap: wrap; border: 1px solid var(--ink); }
.seg button {
  height: 34px; padding: 0 14px; border: 0; border-left: 1px solid var(--ink); background: var(--paper);
  font-size: 13.5px; letter-spacing: .1em; cursor: pointer;
}
.seg button em { margin-left: 6px; font: 400 11px/1 var(--mono); font-style: normal; color: var(--ink-45); }
.seg button:first-child { border-left: 0; }
.seg button:hover { background: var(--ink-08); }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.seg button[aria-pressed="true"] em { color: rgba(255, 255, 255, .6); }
.ref-group[hidden] { display: none; }
.ref-body p:first-child { font-size: 14.5px; color: var(--ink-80); }
.ref-keys { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.ref-keys span { padding: 1px 8px; background: var(--sheet); border: 1px solid var(--ink-15); font-size: 12px; letter-spacing: .06em; color: var(--ink-60); }

.refs { display: grid; gap: 36px; margin-top: 24px; }
.ref-group header { display: flex; align-items: baseline; gap: 14px; padding-bottom: 12px; border-bottom: 2px solid var(--ink); }
.ref-group header span { display: grid; place-items: center; width: 30px; height: 30px; background: var(--ink); color: var(--paper); font: 700 15px/1 var(--song); align-self: center; }
.ref-group h3 { font: 700 22px/1.3 var(--song); letter-spacing: .14em; }
.ref-group header em { margin-left: auto; font: 400 11px/1 var(--mono); font-style: normal; letter-spacing: .2em; color: var(--ink-45); }
.ref-group li {
  display: grid; grid-template-columns: 40px minmax(220px, 1.25fr) 2fr minmax(150px, .9fr); gap: 18px; align-items: baseline;
  padding: 15px 0; border-bottom: 1px solid var(--ink-15);
}
.ref-group li > i { font: 400 12px/1.6 var(--mono); font-style: normal; color: var(--zhu); letter-spacing: .1em; }
.ref-title b { display: block; font: 700 16.5px/1.45 var(--song); letter-spacing: .04em; }
.ref-title small { display: block; margin-top: 3px; font: 400 11.5px/1.5 var(--mono); letter-spacing: .04em; color: var(--ink-45); }
.ref-group li > em {
  justify-self: start; padding: 3px 10px; border: 1px solid var(--ink); background: var(--paper);
  font: 400 12.5px/1.6 var(--song); font-style: normal; letter-spacing: .06em;
}

/* ---------- 页脚 ---------- */
.foot { position: relative; z-index: 1; border-top: 1px solid var(--ink); background: var(--paper); }
.foot-in { width: min(var(--site), calc(100% - 32px)); margin: 0 auto; padding: 28px 0 34px; display: grid; grid-template-columns: auto 1fr; gap: 10px 30px; align-items: center; }
.foot-brand { display: flex; align-items: center; gap: 10px; font: 700 16px/1 var(--song); letter-spacing: .06em; }
.foot-mono { justify-self: end; font: 400 11px/1.6 var(--mono); letter-spacing: .2em; color: var(--ink-45); }
.foot-mono b { color: var(--zhu); }
.foot-note { grid-column: 1 / -1; font-size: 12.5px; color: var(--ink-45); }

/* 进入视口 */
.rise { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.rise.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .rise { opacity: 1; transform: none; transition: none; }
  .banner-down span { animation: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1240px) {
  .site::before, .card-mark { display: none; }
}
@media (max-width: 960px) {
  .cmp-row { grid-template-columns: 150px 1fr 1fr; }
  .ref-group li { grid-template-columns: 34px 1fr; gap: 6px 12px; }
  .ref-group li > .ref-body, .ref-group li > em { grid-column: 2; }
}
@media (max-width: 720px) {
  body { font-size: 15px; }
  .nav { top: 10px; padding: 0 10px; }
  .nav-card { height: 52px; gap: 12px; padding: 0 10px 0 14px; }
  .nav-links {
    position: fixed; top: 70px; left: 10px; right: 10px; flex-direction: column; gap: 0; display: none;
    padding: 6px 18px 10px; background: var(--paper); border: 1px solid var(--ink); box-shadow: var(--shadow-sm);
  }
  .nav-links.is-open { display: flex; }
  .nav-links a { padding: 12px 0; border-bottom: 1px solid var(--ink-08); font-size: 16px; }
  .nav-links a::after { display: none; }
  .nav-maint { margin-left: auto; padding-left: 0; border-left: 0; font-size: 12px; }
  .nav-get { height: 30px; padding: 0 10px; }
  .get { grid-template-columns: auto 1fr; }
  .get-seal { display: none; }
  .nav-toggle { display: grid; gap: 6px; width: 36px; height: 36px; place-content: center; background: none; border: 0; cursor: pointer; }
  .nav-toggle i { display: block; width: 20px; height: 1.5px; background: var(--ink); }
  .banner-copy { bottom: 8vh; padding: 0 16px; }
  .banner-sub { letter-spacing: .06em; }
  .maint { padding: 14px 22px 12px; }
  .maint-days b { font-size: 44px; }
  .maint-tick { font-size: 11px; letter-spacing: .04em; }
  .banner-down { display: none; }
  .site { width: calc(100% - 24px); padding-top: 24px; }
  .card { padding: 26px 18px 28px; margin-bottom: 28px; box-shadow: 4px 4px 0 var(--ink); }
  .eds { grid-template-columns: 1fr; }
  .cmp-row { grid-template-columns: 1fr 1fr; }
  .cmp-row [role="rowheader"] { grid-column: 1 / -1; padding-bottom: 4px; background: var(--sheet); }
  .cmp-row > span { padding: 10px 12px; font-size: 13.5px; }
  .cmp-row > span:nth-child(2) { border-left: 0; }
  .cmp-head > span:first-child { display: none; }
  .cmp-head > span:nth-child(2) { border-left: 0; }
  .timeline::before { left: 5px; }
  .timeline li { grid-template-columns: 1fr; gap: 4px; padding: 12px 0 12px 26px; }
  .timeline li::before { left: 1px; top: 18px; }
  .timeline time { text-align: left; }
  .trio { grid-template-columns: 1fr; }
  .practice { grid-template-columns: 1fr; gap: 10px; padding: 18px; }
  .practice-list b { display: block; }
  .ref-group header { flex-wrap: wrap; }
  .ref-bar .seg { display: grid; grid-template-columns: repeat(3, 1fr); width: 100%; }
  .ref-bar .seg button { border-left: 0; border-top: 1px solid var(--ink); padding: 0 6px; font-size: 12.5px; letter-spacing: .04em; }
  .ref-bar .seg button:nth-child(-n+3) { border-top: 0; }
  .ref-bar .seg button:not(:nth-child(3n+1)) { border-left: 1px solid var(--ink); }
  .ref-group header em { margin-left: 0; width: 100%; padding-left: 44px; }
  .foot-in { grid-template-columns: 1fr; }
  .foot-mono { justify-self: start; }
}
@media (max-width: 460px) {
  .nav-maint { display: none; }
  .nav-get { margin-left: auto; }
}