/* ===== 设计令牌 ===== */
:root{
  --sky:#00A0E9;
  --sky-deep:#0772A6;
  --sky-ink:#0B6D9B;
  --sky-tint:#EAF6FD;
  --paper:#FFFFFF;
  --paper-2:#F6FAFD;
  --ink:#242A2F;
  --muted:#6C757C;
  --faint:#78848C;
  --rule:#E3E8EC;
  --serif:"Songti SC","Noto Serif CJK SC","Noto Serif SC",Georgia,"SimSun",serif;
  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Helvetica Neue",Arial,sans-serif;
  --latin:"Avenir Next","Helvetica Neue",Helvetica,Arial,sans-serif;
  --measure:860px;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--sky-ink);text-decoration:none}
a:hover{color:var(--sky);text-decoration:underline;text-underline-offset:3px}
:focus-visible{outline:2px solid var(--sky);outline-offset:3px;border-radius:4px}
ul{list-style:none;margin:0;padding:0}

/* ===== 顶栏 ===== */
.topbar{
  border-bottom:1px solid var(--rule);
  background:rgba(255,255,255,.92);
  position:sticky;top:0;z-index:20;
  backdrop-filter:saturate(1.2) blur(6px);
}
.topbar-in{
  max-width:var(--measure);margin:0 auto;
  padding:10px 18px;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
}
.brand{display:grid;grid-template-columns:auto 1fr;column-gap:8px;align-items:center;line-height:1.15;min-width:0}
.brand-ico{grid-row:1 / span 2;width:28px;height:28px;object-fit:contain}
.brand b{font-family:var(--latin);font-size:13.5px;font-weight:700;letter-spacing:.2em;color:#4664BC;text-transform:uppercase}
.brand span{font-family:var(--latin);font-size:11px;font-weight:600;letter-spacing:.24em;color:#6C82C4;margin-top:2px;text-transform:uppercase}
.brand .cn{font-family:var(--sans);font-size:10px;font-weight:400;letter-spacing:.08em;color:#9AA6AE;margin-left:9px;text-transform:none}
.nav{display:flex;gap:2px;font-size:14px}
.nav a{white-space:nowrap}
.nav a{
  padding:8px 10px;border-radius:6px;color:var(--muted);
  min-height:40px;display:flex;align-items:center;
}
.nav a[aria-current="true"]{color:var(--sky-ink);font-weight:600;background:var(--sky-tint)}
@media (max-width:560px){
  .topbar-in{padding:8px 12px;gap:8px}
  .brand{column-gap:7px}
  .brand-ico{width:24px;height:24px}
  .brand b{font-size:12px;letter-spacing:.15em}
  .brand span{font-size:10px;letter-spacing:.16em;margin-top:1px}
  .brand .cn{font-size:9.5px;margin-left:6px;letter-spacing:.02em}
  .nav{font-size:12.5px;gap:0}
  .nav a{padding:8px 6px;min-height:38px}
}

/* ===== 视图 ===== */
.view[hidden]{display:none}
.wrap{max-width:var(--measure);margin:0 auto;padding:0 18px}
.hero{position:relative;overflow:hidden;background:#BFE4F7}
.hero img{
  position:relative;z-index:1;
  width:100%;height:clamp(200px,50vw,300px);object-fit:cover;object-position:center top;
  filter:saturate(.94);
}
.hero::after{
  content:"";position:absolute;inset:0;z-index:2;
  background:linear-gradient(180deg,rgba(255,255,255,.04) 0%,rgba(255,255,255,0) 62%,rgba(255,255,255,.3) 80%,rgba(255,255,255,.8) 93%,#fff 100%);
  pointer-events:none;
}
.hero-wave{display:none}
.hero-wave svg{width:100%;height:42px;display:block}

.intro{padding:0 0 0;text-align:center}
.brand-latin{
  font-family:var(--latin);font-size:11px;letter-spacing:.34em;
  color:var(--faint);margin:20px 0 8px;
}
.wordmark{
  margin:0;
  font-size:clamp(38px,9vw,62px);
  font-weight:800;letter-spacing:.12em;
  color:var(--sky-deep);
  line-height:1.15;
  text-indent:.12em; /* 抵消末字后多出的字距，保证视觉居中 */
}
.hero-logo{margin:10px 0 0;line-height:0}
.hero-logo img{
  width:min(400px,70vw);height:auto;margin:0 auto;display:block;
  mix-blend-mode:multiply;
}
.founded{
  margin:6px 0 0;font-size:13px;color:var(--muted);letter-spacing:.02em;
}
.welcome{
  margin:0 auto;max-width:600px;
  font-size:13.5px;line-height:2.05;color:var(--muted);letter-spacing:.02em;
}
.hero-logo + .welcome{margin-top:22px}
.welcome + .welcome{margin-top:3px}
@media (min-width:760px){
  .welcome{width:max-content;max-width:none;white-space:nowrap}
}
.cta{
  display:flex;align-items:center;justify-content:center;
  margin:24px auto 0;max-width:420px;
  min-height:52px;padding:14px 26px;
  background:var(--sky);color:#fff;
  border-radius:999px;
  font-size:15.5px;font-weight:600;letter-spacing:.06em;
  box-shadow:0 6px 18px rgba(0,160,233,.24);
  transition:background .18s ease,transform .18s ease;
}
.cta:hover{background:#0092D6;color:#fff;text-decoration:none;transform:translateY(-1px)}

/* ===== 信件（信纸） ===== */
.letter{
  max-width:620px;margin:44px auto 0;
  padding:32px 22px 26px;
  background:#FBFDFE;
  border:1px solid #E4EBF1;
  border-top:2px solid #B9DFF3;
  box-shadow:0 1px 2px rgba(11,109,155,.05),0 12px 26px -18px rgba(11,109,155,.28);
}
.letter h2{
  font-size:19px;font-weight:700;letter-spacing:.06em;margin:0 0 22px;
  padding-bottom:14px;border-bottom:1px solid #E9F0F5;
  color:var(--ink);
  display:flex;align-items:center;gap:10px;
}
.letter h2::before{content:"";width:22px;height:2px;background:var(--sky);flex:none}
.letter p{
  font-family:var(--serif);
  font-size:16.5px;line-height:2.05;
  margin:0 0 16px;max-width:none;
  letter-spacing:.01em;
  text-indent:2em;
  text-align:justify;
  text-justify:inter-ideograph;
  word-break:normal;
  overflow-wrap:break-word;
}
.letter .sign{
  text-align:right;
  font-family:var(--sans);
  font-size:14px;color:var(--muted);
  margin-top:30px;text-indent:0;padding-top:16px;border-top:1px solid #EFF4F8;
  letter-spacing:.02em;
}

/* ===== 致谢名单 ===== */
.roll{padding:52px 0 8px;text-align:center}
.roll h2{
  font-size:19px;font-weight:700;letter-spacing:.08em;
  margin:0 0 22px;
}
.roll h2 + ul{margin-bottom:44px}
.roll li{
  font-size:15.5px;line-height:2.15;color:#333A40;letter-spacing:.02em;
}
.roll li.dots{color:var(--faint)}

/* ===== 蓝色口号带 ===== */
.band{
  margin:22px 0 0;
  background:var(--sky);
  color:#fff;
  padding:56px 22px;
  text-align:center;
}
.band p{
  margin:0;font-size:clamp(21px,5.6vw,34px);
  font-weight:700;line-height:1.95;letter-spacing:.14em;
  text-indent:.14em;
}
.band p:last-child{margin-top:6px}
.farewell{
  text-align:center;
  font-family:var(--serif);
  font-size:clamp(24px,6.6vw,40px);
  letter-spacing:.06em;
  color:#0090D2;
  padding:40px 0 12px;margin:0;
}

/* ===== 站点入口 ===== */
.sites{padding:24px 0 8px;border-top:1px solid var(--rule);margin-top:36px}
.sites h2{font-size:15px;font-weight:700;letter-spacing:.1em;color:var(--muted);margin:0 0 20px;text-align:center}
.logo-row{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:12px 12px}
.logo-row a{display:block;line-height:0}
.logo-row img{
  width:min(145px,42vw);height:auto;
  border:0;border-radius:2px;
}

/* ===== 友连 ===== */
.sites-more{margin:20px 0 0;text-align:center;font-size:12.5px;line-height:2;color:var(--muted)}
.sites-more a{color:var(--sky-ink)}
.partners{padding:40px 0 12px;text-align:center}
.partners h2{font-size:15px;font-weight:700;letter-spacing:.1em;color:var(--muted);margin:0 0 22px}
.partner-logos{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:16px 20px}
.partner-logos img{width:88px;height:31px;border:0}

/* ===== 联络页 ===== */
.notice-head{
  background:var(--sky-tint);
  padding:48px 18px 44px;text-align:center;
  border-bottom:1px solid rgba(0,160,233,.16);
}
.notice-head h1{
  margin:0;font-size:clamp(28px,7vw,42px);font-weight:800;letter-spacing:.14em;
  color:var(--sky-deep);text-indent:.14em;
}
.notice-head p{margin:12px 0 0;font-size:15px;color:#37505C;letter-spacing:.02em}

.notice-body{padding-top:34px}
.stopped{
  border-left:3px solid var(--sky);
  background:var(--paper-2);
  padding:16px 18px;margin:0 0 10px;
  font-size:14.5px;line-height:1.9;color:#33424B;
}
.stopped strong{font-weight:700;color:var(--ink)}
.stopped span{display:block;margin-top:4px;font-size:13.5px;color:var(--muted)}

.kicker{font-size:15px;font-weight:700;letter-spacing:.06em;color:var(--sky-deep);margin:2px 0 12px}
.contacts{margin:34px 0 0}
.contacts h2{font-size:15px;font-weight:700;letter-spacing:.1em;color:var(--muted);margin:0 0 6px}
.contact-row{
  padding:20px 0;border-top:1px solid var(--rule);
}
.contact-row:last-of-type{border-bottom:0}
.contact-label{
  font-size:12.5px;letter-spacing:.12em;color:var(--faint);margin:0 0 6px;
}
.contact-value{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  margin:0;
  font-size:clamp(18px,4.6vw,22px);
  font-weight:700;letter-spacing:.02em;
  color:var(--sky-ink);
  overflow-wrap:anywhere;
}
.contact-value a{color:var(--sky-ink)}
.contact-note{font-size:12.5px;color:var(--muted);margin:8px 0 0;line-height:1.8}
.copy-btn{
  font:inherit;font-size:12px;font-weight:600;letter-spacing:.06em;
  color:var(--sky-ink);background:#fff;border:1px solid rgba(0,160,233,.35);
  border-radius:999px;padding:6px 12px;min-height:34px;cursor:pointer;
  transition:background .16s ease;
}
.copy-btn:hover{background:var(--sky-tint)}
.copy-btn:active{background:#D9EEFA}

.sig-line{
  text-align:right;font-size:14px;color:var(--muted);margin:26px 0 0;
}


.staff-sites{padding:36px 0 6px;border-top:1px solid var(--rule);margin-top:44px}
.staff-sites h2{font-size:18px;font-weight:700;letter-spacing:.06em;margin:0 0 24px}
.member-grid{
  display:grid;grid-template-columns:repeat(2,1fr);
  gap:24px 12px;max-width:560px;margin:0 auto;
  justify-items:center;text-align:center;
}
.member{display:block;color:var(--ink);min-width:0}
.member img{
  width:64px;height:64px;border-radius:50%;
  margin:0 auto 10px;background:var(--sky-tint);
  object-fit:cover;
}
.member b{display:block;font-size:13.5px;font-weight:600;letter-spacing:.02em;overflow-wrap:anywhere}
.member span{display:block;font-family:var(--latin);font-size:11px;color:var(--faint);margin-top:3px;letter-spacing:.02em;overflow-wrap:anywhere}
.member:hover b{color:var(--sky-ink)}
.members-note{font-size:12.5px;color:var(--muted);line-height:1.9;margin:26px 0 0}

.groups{
  margin:34px 0 0;padding:20px 18px;
  background:var(--paper-2);border:1px solid var(--rule);
}
.groups h2{font-size:13px;font-weight:700;letter-spacing:.08em;color:var(--muted);margin:0 0 12px}
.groups p{font-size:12.5px;line-height:2;color:#4A565E;margin:0 0 12px;letter-spacing:.01em}
.groups p:last-child{margin-bottom:0}
.groups b{font-weight:700;color:var(--ink)}

.back-row{padding:32px 0 8px;text-align:center}
.back{padding:12px;display:inline-block}

/* ===== 關於 ===== */
.about-body{padding-top:76px}
.about-lede{
  font-family:var(--serif);
  font-size:16.5px;line-height:2;
  margin:0 0 16px;text-indent:2em;
  text-align:justify;text-justify:inter-ideograph;
  color:#2A3338;
}
.tl{margin:30px 0 0;padding:0;list-style:none}
.tl li{display:grid;grid-template-columns:56px 16px 1fr;align-items:start;position:relative;padding:0 0 20px}
.tl li .y{
  font-family:var(--latin);font-size:12.5px;letter-spacing:.05em;color:var(--sky-ink);
  text-align:right;padding-top:2px;white-space:nowrap;
}
.tl li .d{width:7px;height:7px;border-radius:50%;background:var(--sky);justify-self:center;margin-top:8px;position:relative;z-index:1}
.tl li .tx{font-size:14px;line-height:1.9;color:#3A444B;padding-left:12px}
.tl li .tx p{margin:0 0 7px}
.tl li .tx p:last-child{margin:0}
.tl li::before{content:"";position:absolute;left:63.5px;top:0;bottom:0;width:1px;background:#D7E2E9}
.tl li:last-child::before{bottom:auto;height:12px}

.facts{display:grid;grid-template-columns:5.6em 1fr;margin:30px 0 0;border-top:1px solid var(--rule)}
.facts dt{font-size:12.5px;color:var(--muted);letter-spacing:.06em;padding:12px 14px 12px 0;border-bottom:1px solid #EDF3F7}
.facts dd{margin:0;font-size:13.5px;line-height:1.85;color:#333C43;padding:12px 0;border-bottom:1px solid #EDF3F7}

.sec{margin:36px 0 0}
.sec h2{font-size:15px;font-weight:700;letter-spacing:.1em;color:var(--muted);margin:0 0 8px}

.teams{display:grid;grid-template-columns:1fr;gap:10px;margin-top:18px}
.team{padding:13px 15px;background:#FCFDFE;border:1px solid var(--rule)}
.team h3{margin:0 0 3px;font-size:13.5px;font-weight:700;letter-spacing:.02em;color:var(--ink)}
.team p.meta{margin:0 0 6px;font-family:var(--latin);font-size:11.5px;letter-spacing:.04em;color:var(--sky-ink)}
.team p{font-size:12.5px;line-height:1.85;color:#4A565E;margin:0}
.grp-note{font-size:12px;line-height:1.85;color:var(--muted);margin:6px 0 0}
.team .ros{margin-top:8px;font-size:11px;line-height:1.75;color:var(--faint)}
@media (min-width:720px){
  .teams{grid-template-columns:repeat(2,1fr);gap:12px}
}

.quote{margin:24px 0 0;padding:20px 22px;background:#F5FAFD;border-top:1px solid #DCEDF7;border-bottom:1px solid #DCEDF7}
.quote p{font-family:var(--serif);font-size:16px;line-height:2.05;margin:0;color:#2A3338;text-indent:0}
.quote cite{display:block;margin-top:10px;font-size:11.5px;font-style:normal;color:var(--faint);letter-spacing:.02em}
.creed{margin:20px 0 0;padding:18px 20px 16px;border-left:2px solid #B9DFF3;background:#FBFDFE}
.creed p{margin:0 0 6px;font-family:var(--serif);font-size:13.5px;line-height:1.95;color:#33404A;text-indent:0}
.creed p.last{margin:10px 0 8px;color:var(--sky-ink);font-weight:600}
.creed cite{display:block;font-size:11.5px;font-style:normal;color:var(--faint)}

.about-note{font-size:13px;line-height:1.95;color:#4A565E;margin:16px 0 0}

.titles-tools{display:flex;align-items:center;gap:12px;margin:14px 0 4px}
.works-q{
  flex:1;min-width:0;max-width:280px;font-size:13px;
  padding:9px 12px;border:1px solid var(--rule);border-radius:6px;
  background:#FFF;color:var(--ink);
}
.works-q:focus{outline:none;border-color:var(--sky)}
.works-count{font-size:11.5px;color:var(--faint);white-space:nowrap;letter-spacing:.02em}
.titles-more{display:flex;justify-content:center;margin:18px 0 0}
.works-more{
  font:inherit;font-size:12.5px;letter-spacing:.04em;color:var(--sky-ink);
  padding:8px 18px;border:1px solid var(--rule);border-radius:6px;background:#FFF;
  cursor:pointer;
}
.works-more:hover{border-color:var(--sky);color:var(--sky)}
.works-more[hidden]{display:none}
.titles{
  columns:1;column-gap:26px;
  margin:12px 0 0;padding:0;list-style:none;
  font-size:12.5px;line-height:1.65;color:#4A565E;letter-spacing:.01em;
}
.titles li{break-inside:avoid;padding-bottom:11px}
.titles .t{display:block}
.t-sub{display:block;font-size:10.5px;line-height:1.5;color:#9AA6AD;margin-top:1px}
@media (min-width:640px){.titles{columns:2}}
@media (min-width:1000px){.titles{columns:3}}
@media (min-width:720px){
}

.club{display:grid;grid-template-columns:1fr;gap:10px;margin-top:18px}
.club > div{padding:14px 16px;background:#FCFDFE;border:1px solid var(--rule)}
.club h3{margin:0 0 3px;font-size:13.5px;font-weight:700;letter-spacing:.02em;color:var(--ink)}
.club p.meta{margin:0 0 6px;font-family:var(--latin);font-size:11.5px;letter-spacing:.04em;color:var(--sky-ink)}
.club p{font-size:12.5px;line-height:1.85;color:#4A565E;margin:0}
@media (min-width:720px){
  .club{grid-template-columns:repeat(2,1fr);gap:12px}
}

.members{list-style:none;margin:16px 0 0;padding:0;border-top:1px solid var(--rule)}
.members li{padding:13px 0 14px;border-bottom:1px solid #EFF4F8}
.members .nm{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 10px}
.members .nm b{font-size:14px;font-weight:700;letter-spacing:.02em;color:var(--sky-ink)}
.members .nm em{font-style:normal;font-size:11.5px;letter-spacing:.04em;color:var(--faint);font-family:var(--latin)}
.members p{margin:5px 0 0;font-size:12.5px;line-height:1.9;color:#4A565E}

.crew{list-style:none;margin:18px 0 0;padding:0;border-top:1px solid var(--rule)}
.crew li{display:grid;grid-template-columns:9.2em 1fr;gap:12px;padding:11px 0;border-bottom:1px solid #EFF4F8;font-size:13px;line-height:1.8}
.crew b{color:var(--sky-ink);font-weight:600;letter-spacing:.01em}
.crew span{color:#4A565E;min-width:0}

.works{margin:34px 0 0}
.works h2{font-size:15px;font-weight:700;letter-spacing:.1em;color:var(--muted);margin:0 0 14px}
.work{padding:16px 18px;background:var(--paper-2);border:1px solid var(--rule);margin:0 0 12px}
.work h3{font-size:14px;font-weight:700;letter-spacing:.04em;margin:0 0 6px;color:var(--ink)}
.work p{font-size:13px;line-height:1.95;color:#4A565E;margin:0}
.about-src{font-size:12px;color:var(--faint);line-height:1.9;margin:26px 0 0}
@media (max-width:600px){
  .about-lede{text-align:left}
}

/* ===== 页脚 ===== */
.site-foot{background:#F1F6FA;border-top:3px solid var(--sky);margin-top:56px}
.foot-in{max-width:calc(var(--measure) + 64px);margin:0 auto;padding:32px 18px 30px;text-align:left}
.foot-brand{margin:0 0 16px;display:flex;align-items:baseline;gap:10px}
.foot-brand b{font-family:var(--serif);font-size:17px;font-weight:700;color:var(--sky-ink);letter-spacing:.06em}
.foot-brand span{font-size:9.5px;letter-spacing:.18em;color:var(--faint);text-transform:uppercase}
.foot-jp{font-size:11.5px;line-height:1.9;color:var(--muted);margin:0;letter-spacing:.01em}
.foot-links{font-size:12.5px;line-height:2;color:var(--muted);margin:18px 0 0}
.foot-links p{margin:5px 0}
.foot-links a{color:var(--sky-ink)}
.foot-item{white-space:nowrap}
.foot-sep{color:#C9D3D9;padding:0 5px}
.foot-note{margin:22px 0 0;font-size:11.5px;line-height:1.95;color:var(--faint);letter-spacing:.02em}
.foot-tech{margin:10px 0 0;font-size:11.5px;line-height:1.95;color:var(--faint)}
.copyright{margin:24px 0 0;padding-top:16px;border-top:1px solid #DCE6ED;font-size:11.5px;color:var(--faint);letter-spacing:.04em}

/* ===== 提示条 ===== */
.toast{
  position:fixed;left:50%;bottom:26px;transform:translate(-50%,16px);
  background:var(--sky-deep);color:#fff;
  font-size:14px;letter-spacing:.04em;
  padding:11px 20px;border-radius:999px;
  box-shadow:0 8px 24px rgba(7,114,166,.28);
  opacity:0;pointer-events:none;transition:opacity .2s ease,transform .2s ease;
  z-index:40;max-width:calc(100vw - 32px);
}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* ===== 宽屏 ===== */
@media (min-width:720px){
  .wrap{padding-left:30px;padding-right:30px}
  .topbar-in{padding:12px 30px}
  .hero img{width:100%;height:clamp(340px,26vw,470px);aspect-ratio:auto;object-fit:cover;object-position:center top}
  .hero-wave svg{height:58px}
  .brand-latin{margin-top:28px;font-size:11px}
  .intro{padding-top:2px}
  .cta{max-width:360px;margin-top:28px}
  .letter{padding:44px 46px 36px;margin-top:56px}
  .letter h2{font-size:20px}
  .roll{padding-top:64px}
  .roll h2{font-size:20px}
  .roll li{font-size:16px;line-height:2.2}
  .band{padding:76px 30px}
  .partner-logos{gap:18px 22px}
  .notice-head{padding:72px 30px 60px}
  .notice-body{padding-top:44px}
  .member-grid{grid-template-columns:repeat(4,1fr);gap:26px 18px;max-width:640px}
  .contact-value{font-size:23px}
}

@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important}
}