/* 慕寒工作室 — MuHan Studio
   色板与字体沿用慕寒智能（ai.novasync.cn），保持同一品牌调性。 */

:root{
  --paper:#eaf0f5;
  --paper-raised:#f4f7fa;
  --paper-sunken:#e0e7ee;
  --ink:#12202e;
  --ink-2:#3a4a5c;
  --ink-3:#5a6879;
  --line:#ccd6e0;
  --line-strong:#aebbc9;
  --accent:#0f63b8;
  --accent-deep:#0a4c8f;
  --tint:#e2ecf7;
  --on-tint:#123a63;
  --deep:#0a3355;
  --deep-2:#072744;
  --deep-line:#1d4f77;

  --serif:"Noto Serif SC",Georgia,"Songti SC","SimSun",serif;
  --sans:"Noto Sans SC",-apple-system,BlinkMacSystemFont,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",sans-serif;
  --mono:"Spline Sans Mono",ui-monospace,SFMono-Regular,Menlo,monospace;

  --ease:cubic-bezier(.16,1,.3,1);
  --maxw:1120px;
  --radius:12px;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{
  scroll-behavior:smooth;
  scroll-padding-top:84px;
  -webkit-text-size-adjust:100%;
  scrollbar-color:var(--line-strong) var(--paper-sunken);
}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16.5px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  caret-color:var(--accent);
  overflow-x:hidden;
}

/* 浏览器表面 */
::selection{background:var(--accent);color:#fff}
::-webkit-scrollbar{width:11px;height:11px}
::-webkit-scrollbar-track{background:var(--paper-sunken)}
::-webkit-scrollbar-thumb{background:var(--line-strong);border:3px solid var(--paper-sunken);border-radius:8px}
::-webkit-scrollbar-thumb:hover{background:var(--ink-3)}

a{color:var(--accent-deep);text-decoration:none;text-underline-offset:4px;text-decoration-thickness:1.5px}
a:hover{text-decoration:underline}
:focus-visible{outline:2.5px solid var(--accent);outline-offset:3px;border-radius:5px}
img,svg{display:block;max-width:100%}
.mono{font-family:var(--mono)}

.skip{
  position:absolute;left:-9999px;top:0;z-index:99;
  background:var(--accent);color:#fff;padding:12px 18px;border-radius:0 0 8px 0;font-weight:700;
}
.skip:focus{left:0}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}

/* ---------- 导航 ---------- */
.nav{
  position:sticky;top:0;z-index:40;
  background:rgba(234,240,245,.82);
  backdrop-filter:saturate(140%) blur(10px);
  border-bottom:1px solid transparent;
  transition:border-color .3s var(--ease),background .3s var(--ease);
}
.nav.is-stuck{border-bottom-color:var(--line);background:rgba(234,240,245,.94)}
.nav-in{display:flex;align-items:center;justify-content:space-between;gap:24px;height:70px}
.brand{display:flex;align-items:center;gap:11px;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand-mark{
  width:42px;height:42px;border-radius:12px;
  background:var(--deep);
  padding:6px;
  transform:translateY(-1px);
  box-shadow:0 6px 14px -8px rgba(10,51,85,.6);
}
.brand-name{font-family:var(--serif);font-weight:700;font-size:18px;letter-spacing:.02em}
.nav-links{display:flex;gap:28px}
.nav-links a{
  color:var(--ink-2);font-size:15px;font-weight:500;
  padding:6px 0;position:relative;
}
.nav-links a::after{
  content:"";position:absolute;left:0;right:100%;bottom:0;height:1.5px;
  background:var(--accent);transition:right .32s var(--ease);
}
.nav-links a:hover{color:var(--accent-deep);text-decoration:none}
.nav-links a:hover::after{right:0}

/* ---------- Hero ---------- */
.hero{padding:84px 0 76px;position:relative}
.hero::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--line);
}
.hero-in{display:grid;grid-template-columns:1fr 380px;gap:64px;align-items:center}
.hero-title{
  font-family:var(--serif);font-weight:900;
  font-size:clamp(3rem,7.4vw,5.5rem);
  line-height:1.02;letter-spacing:-.03em;
  color:var(--ink);
}
.hero-latin{
  margin-top:18px;
  font-family:var(--mono);font-size:14px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--ink-3);
}
.hero-latin .dot{margin:0 .6em;color:var(--line-strong)}
.hero-slogan{
  margin-top:26px;
  font-family:var(--serif);font-weight:700;
  font-size:clamp(1.35rem,2.7vw,1.9rem);
  letter-spacing:.06em;color:var(--accent-deep);
}
.hero-lead{
  margin-top:22px;max-width:58ch;
  font-size:17px;line-height:1.85;color:var(--ink-2);
}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:38px}

.hero-mark{justify-self:center}
.hero-disc{
  width:340px;height:340px;border-radius:50%;
  background:radial-gradient(120% 120% at 32% 20%,#0e2e4c 0%,#08203a 48%,#050f1a 100%);
  display:grid;place-items:center;
  box-shadow:0 26px 54px -22px rgba(10,51,85,.55),0 3px 10px -4px rgba(10,51,85,.35),
             inset 0 1px 0 rgba(175,221,255,.14);
}
.hero-logo{width:66%;height:auto}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:9px;
  padding:13px 24px;border-radius:10px;
  font-family:var(--sans);font-weight:700;font-size:15.5px;
  border:1.5px solid transparent;cursor:pointer;
  transition:transform .18s var(--ease),background .18s,box-shadow .18s,border-color .18s,color .18s;
}
.btn:active{transform:translateY(1px)}
.btn:hover{text-decoration:none}
.btn-sm{padding:10px 19px;font-size:14.5px}
.btn-primary{
  background:var(--accent);color:#fff;
  box-shadow:0 10px 24px -10px rgba(15,99,184,.6);
}
.btn-primary:hover{background:var(--accent-deep);box-shadow:0 14px 30px -12px rgba(10,76,143,.66)}
.btn-ghost{
  background:var(--paper-raised);color:var(--ink);border-color:var(--line-strong);
}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent-deep);background:#fff}
.btn[disabled],.btn[aria-disabled="true"]{opacity:.5;pointer-events:none}

/* ---------- 通用排版 ---------- */
.h2{
  font-family:var(--serif);font-weight:700;
  font-size:clamp(1.7rem,3.6vw,2.4rem);
  line-height:1.28;letter-spacing:-.015em;
  color:var(--ink);
  margin-bottom:26px;
}
.section{padding:78px 0}
.section+.section{border-top:1px solid var(--line)}
.section-lead{
  margin:-8px 0 34px;max-width:56ch;
  color:var(--ink-2);font-size:16.5px;
}
.prose{max-width:66ch}
.prose p{color:var(--ink-2);font-size:17px;line-height:1.9}
.prose p+p{margin-top:18px}

.band{
  padding:78px 0;
  background:var(--tint);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.band .prose p{color:var(--on-tint)}
.band .h2{color:var(--deep)}

/* 事实表 */
.facts{
  display:flex;flex-wrap:wrap;gap:14px 56px;
  margin-top:40px;padding-top:28px;
  border-top:1px solid #c3d7ea;
}
.facts dt{
  font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ink-3);margin-bottom:4px;
}
.band .facts dt{color:#4a6c8f}
.facts dd{font-family:var(--serif);font-weight:700;font-size:19px;color:var(--deep)}

/* 两栏文字块，不是卡片 */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;margin-top:6px}
.pane{padding-top:26px;border-top:2px solid var(--ink)}
.pane-title{
  font-family:var(--serif);font-weight:700;font-size:1.4rem;
  letter-spacing:-.01em;margin-bottom:14px;color:var(--ink);
}
.pane p{color:var(--ink-2);max-width:46ch;font-size:16.5px}
.inline-link{
  display:inline-flex;align-items:center;gap:7px;
  margin-top:18px;font-weight:700;font-size:15px;
}
.inline-link svg{transition:transform .28s var(--ease)}
.inline-link:hover svg{transform:translateX(4px)}

/* ---------- 产品 ---------- */
.product{
  display:grid;grid-template-columns:120px 1fr;gap:36px;align-items:start;
  background:var(--paper-raised);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:34px 36px;
  box-shadow:0 18px 40px -28px rgba(18,32,46,.45);
}
.product-icon{
  width:92px;height:92px;border-radius:21px;
  overflow:hidden;
  box-shadow:0 10px 22px -12px rgba(15,99,184,.55);
}
.product-icon img{width:100%;height:100%;object-fit:cover;border-radius:21px}
.product-name{font-family:var(--serif);font-weight:700;font-size:1.75rem;letter-spacing:-.015em}
.product-meta{
  font-size:13px;letter-spacing:.06em;color:var(--ink-3);margin-top:5px;
}
.product-desc{margin:16px 0 24px;max-width:56ch;color:var(--ink-2);font-size:16.5px}

/* ---------- 开源列表 ---------- */
.repos{list-style:none;border-top:1px solid var(--line);margin-bottom:34px}
.repo{border-bottom:1px solid var(--line)}
.repo a{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  grid-template-areas:"head tags" "desc tags";
  align-items:start;gap:5px 28px;
  padding:18px 14px 18px 12px;
  color:var(--ink);
  transition:background .2s var(--ease),padding-left .2s var(--ease);
}
.repo a:hover{
  background:var(--paper-raised);
  padding-left:20px;
  text-decoration:none;
}
.repo-head{grid-area:head;display:flex;align-items:baseline;gap:13px;flex-wrap:wrap;min-width:0}
.repo-name{
  font-family:var(--serif);font-weight:700;font-size:19px;letter-spacing:-.01em;
  color:var(--accent-deep);
}
.repo a:hover .repo-name{text-decoration:underline;text-underline-offset:4px}
.repo-slug{font-size:13px;color:var(--ink-3);letter-spacing:.01em;word-break:break-all}
.repo-desc{grid-area:desc;color:var(--ink-2);font-size:15.5px;line-height:1.65;max-width:62ch}
.repo-tags{grid-area:tags;display:flex;align-items:center;gap:13px;white-space:nowrap;padding-top:4px}
.tag{
  font-size:12px;letter-spacing:.06em;color:var(--on-tint);
  background:var(--tint);border-radius:6px;padding:3px 9px;
}
.star{
  display:inline-flex;align-items:center;gap:4px;
  font-size:12.5px;color:var(--ink-3);
  font-variant-numeric:tabular-nums;
}
.star::before{
  content:"";width:11px;height:11px;background:currentColor;
  -webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M8 1.4l1.9 4.2 4.6.5-3.5 3.1.9 4.5L8 11.6 4.1 13.7l.9-4.5L1.5 6.1l4.6-.5z'/%3E%3C/svg%3E") center/contain no-repeat;
  mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M8 1.4l1.9 4.2 4.6.5-3.5 3.1.9 4.5L8 11.6 4.1 13.7l.9-4.5L1.5 6.1l4.6-.5z'/%3E%3C/svg%3E") center/contain no-repeat;
}

/* ---------- 成员 ---------- */
.person{
  display:grid;grid-template-columns:200px 1fr;gap:44px;align-items:start;
  max-width:820px;
}
.person-face{
  width:200px;height:200px;border-radius:50%;
  object-fit:cover;
  background:var(--paper-sunken);
  border:1px solid var(--line);
}
.person-name{
  font-family:var(--serif);font-weight:700;font-size:2rem;letter-spacing:-.02em;
  display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;
}
.person-role{
  font-family:var(--sans);font-weight:500;font-size:13.5px;letter-spacing:.1em;
  color:var(--accent-deep);background:var(--tint);
  border-radius:6px;padding:4px 11px;
}
.person-fact{margin-top:14px;max-width:48ch;color:var(--ink-2);font-size:17px}
.person-links{margin-top:20px;font-size:15.5px}
.person-links a{font-weight:700}
.sep{color:var(--line-strong);margin:0 10px}

/* ---------- 联系 ---------- */
.contact{background:var(--paper-sunken);border-top:1px solid var(--line)}
.mail{
  display:inline-block;
  font-family:var(--mono);font-weight:500;
  font-size:clamp(1.15rem,3.2vw,1.9rem);
  letter-spacing:-.01em;
  color:var(--accent-deep);
  padding:6px 0;
  border-bottom:2px solid var(--accent);
}
.mail:hover{color:var(--deep);border-bottom-color:var(--deep);text-decoration:none}
.contact-links{margin-top:30px;font-size:15.5px}
.contact-links a{font-weight:700}

/* ---------- 页脚 ---------- */
.foot{background:var(--deep);color:#cfe0f0;padding:56px 0 44px}
.foot-in{display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap}
.foot-brand{display:flex;align-items:center;gap:16px}
.foot-brand img{width:62px;height:62px}
.foot-name{font-family:var(--serif);font-weight:700;font-size:19px;color:#fff;letter-spacing:.02em}
.foot-slogan{font-size:14px;color:#8fb2d4;letter-spacing:.08em;margin-top:2px}
.foot-copy{font-size:13.5px;color:#8fb2d4}

/* ---------- 入场：一次编排好的揭示 ---------- */
.reveal{opacity:0;transform:translateY(18px)}
.reveal.is-in{
  opacity:1;transform:none;
  transition:opacity .7s var(--ease),transform .7s var(--ease);
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
  .reveal.is-in{transition:none}
  *{animation-duration:.01ms !important}
}

/* ---------- 响应式 ---------- */
@media (max-width:1000px){
  .hero-in{grid-template-columns:1fr;gap:44px}
  .hero-mark{justify-self:start}
  .hero-disc{width:250px;height:250px}
  .split{grid-template-columns:1fr;gap:34px}
}
@media (max-width:760px){
  .nav-links{display:none}
  .hero{padding:26px 0 46px}
  .hero-in{display:flex;flex-direction:column;gap:26px}
  .hero-mark{order:-1;align-self:flex-start}
  .hero-disc{width:104px;height:104px;box-shadow:0 12px 26px -14px rgba(10,51,85,.5),inset 0 1px 0 rgba(175,221,255,.14)}
  .hero-logo{width:70%}
  .hero-title{font-size:clamp(2.6rem,11.5vw,3.6rem)}
  .hero-lead{font-size:16px;line-height:1.8}
  .hero-actions{margin-top:26px;gap:11px}
  .section,.band{padding:56px 0}
  .product{grid-template-columns:1fr;gap:24px;padding:26px 24px}
  .person{grid-template-columns:1fr;gap:26px}
  .person-face{width:150px;height:150px}
  .repo a{grid-template-columns:1fr;grid-template-areas:"head" "desc" "tags";gap:6px;padding:16px 6px}
  .repo-tags{justify-self:start;padding-top:2px}
  .repo-head{gap:9px}
  .facts{gap:14px 34px}
}
@media (max-width:420px){
  .wrap{padding:0 20px}
  .hero-actions .btn{flex:1 1 100%;justify-content:center}
}