@charset "UTF-8";

/* About page prologue. The paper installation is a design illustration, not the route map. */
.about-preface-page .about-preface-header{position:relative;z-index:20;display:flex;flex-wrap:nowrap;align-items:center;justify-content:space-between;gap:25px;width:100%;height:80px;min-height:80px;padding:0 44px;border-bottom:1px solid #435c4c;background:#142822;color:#f2eee2}
.about-preface-brand{display:flex;align-items:center;gap:11px;white-space:nowrap;text-decoration:none}
.about-preface-seal{display:grid;place-items:center;width:37px;height:37px;border:1px solid #d8b67c;border-radius:0;color:#d8b67c;font:24px var(--serif,"Songti SC",serif);transform:rotate(-4deg)}
.about-preface-brand-name{font:21px/1.1 "Songti SC","STSong",serif;letter-spacing:.17em}
.about-preface-brand-name small{display:block;margin-top:3px;color:#9faf9f;font:8px/1 "PingFang SC","Microsoft YaHei",sans-serif;letter-spacing:.32em}
.about-preface-page .about-preface-nav{display:flex;align-items:center;gap:32px;margin-left:auto;color:#bdcabc;font-size:12px;letter-spacing:.12em;white-space:nowrap}
.about-preface-page .about-preface-nav a{color:#bdcabc;text-decoration:none}
.about-preface-page .about-preface-nav a:hover,.about-preface-back:hover{color:#e7c58c}
.about-preface-back{display:flex;align-items:center;gap:17px;align-self:center;min-height:44px;padding-bottom:11px;border-bottom:1px solid #d8b67c;color:#f2eee2;font-size:12px;letter-spacing:.12em;white-space:nowrap;text-decoration:none}
.about-preface-back span{color:#dfc18a;font-size:19px}
.about-preface-v41{background:#081710;color:#f2eee2}
.about-preface-scene{position:relative;isolation:isolate;width:100%;height:100%;min-height:570px;overflow:hidden;background:#07130d url("../assets/about-preface-background-v41.png") center 53%/cover no-repeat}
.about-preface-scene::before{content:"";position:absolute;z-index:0;inset:0;background:linear-gradient(90deg,rgba(2,14,10,.76) 0%,rgba(2,14,10,.60) 34%,rgba(2,14,10,.32) 51%,transparent 72%),linear-gradient(0deg,rgba(3,16,12,.78),transparent 23%);pointer-events:none}
.about-preface-copy{position:relative;z-index:1;width:590px;max-width:calc(100% - 120px);margin-left:7.2%;padding-top:42px}
.about-preface-eyebrow{color:#ddbc81;font-size:10px;font-weight:700;letter-spacing:.24em}
.about-preface-copy h1{margin:37px 0 0;font:400 clamp(59px,5.6vw,76px)/1.23 "Songti SC","STSong","Noto Serif CJK SC",serif;letter-spacing:.055em;text-shadow:0 2px 20px rgba(0,0,0,.2)}
.about-preface-copy h1 em{color:#e4c28b;font-style:normal}
.about-preface-copy p{max-width:488px;margin:24px 0 0;color:#cbd4c8;font-size:14px;line-height:1.95;letter-spacing:.03em}
.about-preface-actions{display:flex;align-items:center;gap:30px;margin-top:30px}
.about-preface-actions a{display:inline-flex;align-items:center;justify-content:space-between;min-height:50px;white-space:nowrap;font-size:12px;letter-spacing:.08em;text-decoration:none}
.about-preface-primary{min-width:190px;padding:0 18px;background:#dfc48f;color:#193329;font-weight:700}
.about-preface-primary span{font-size:19px;font-weight:400}
.about-preface-secondary{gap:21px;padding:0 1px;border-bottom:1px solid #aec2ae;color:#efece0}
.about-preface-secondary span{color:#e1c18b;font-size:18px}
.about-preface-actions .about-preface-primary:hover{background:#f2dcae}
.about-preface-actions .about-preface-secondary:hover{color:#efc88d}
.about-preface-bottom{position:absolute;z-index:1;right:6.8%;bottom:34px;left:7.2%;display:flex;align-items:center;justify-content:space-between;gap:25px;padding-top:17px;border-top:1px solid rgba(226,209,171,.47);font-size:10px;letter-spacing:.12em}
.about-preface-scope{display:flex;align-items:center;gap:32px;color:#dddac9}
.about-preface-scope b{margin-right:7px;color:#e1bf83;font:18px Georgia,serif;font-weight:400}
.about-preface-note{color:#b1c4b3;text-align:right}
body.about-preface-page[data-horizontal-current="0"] .site-guide-launcher{display:none}

@media(max-width:900px){
  .about-preface-page .about-preface-header{padding:0 22px}
  .about-preface-page .about-preface-nav{gap:15px;font-size:10px}
  .about-preface-page .about-preface-nav a:nth-child(-n+4){display:none}
  .about-preface-copy{margin-left:6%;max-width:88%}
  .about-preface-bottom{right:6%;left:6%}
  .about-preface-scope{gap:14px}
}
@media(max-width:600px){
  .about-preface-page .about-preface-header{display:flex;flex-wrap:wrap;align-content:space-between;gap:0;height:86px;min-height:86px;padding:6px 18px 8px}
  .about-preface-brand{width:100%;height:41px}
  .about-preface-seal{width:31px;height:31px;font-size:20px}
  .about-preface-brand-name{font-size:17px}
  .about-preface-page .about-preface-nav{justify-content:space-between;width:100%;margin-left:0;font-size:10px}
  .about-preface-page .about-preface-nav a:nth-child(-n+4){display:inline}
  .about-preface-page .about-preface-nav a:nth-child(2),.about-preface-page .about-preface-nav a:nth-child(4){display:none}
  .about-preface-back{display:none}
  .about-preface-scene{height:auto;min-height:740px;background-position:67% center}
  .about-preface-scene::before{background:linear-gradient(90deg,rgba(2,14,10,.93),rgba(2,14,10,.50) 70%),linear-gradient(0deg,rgba(3,16,12,.83),transparent 30%)}
  .about-preface-copy{margin-left:7%;max-width:90%;padding-top:48px}
  .about-preface-copy h1{font-size:42px;letter-spacing:0}
  .about-preface-copy p{font-size:12px}
  .about-preface-actions{gap:14px;flex-wrap:wrap}
  .about-preface-primary{min-width:0;width:100%}
  .about-preface-bottom{right:7%;bottom:35px;left:7%;display:block}
  .about-preface-scope{gap:19px;flex-wrap:wrap}
  .about-preface-note{margin-top:14px;text-align:left;line-height:1.8}
}