/* ZIWU LAB. — design system v1.0 */
:root{
  --bg:#090B10;
  --bg-soft:#0C1017;
  --card:#111722;
  --line:rgba(220,230,243,.10);
  --line-strong:rgba(220,230,243,.18);
  --ink:#DCE6F3;
  --dim:#A1ADBD;
  --muted:#68727F;
  --accent:#DCE6F3;
  --r:2px;
  --max:1120px;
  --pad:22px;
  --ease:cubic-bezier(.22,.68,.18,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:"Noto Sans TC","PingFang TC","Hiragino Sans GB","Microsoft JhengHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;line-height:1.75;letter-spacing:.015em;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img,svg{max-width:100%}
a{color:inherit;text-decoration:none}
::selection{background:rgba(220,230,243,.18)}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,"Roboto Mono",monospace;letter-spacing:.08em}
.wrap{max-width:var(--max);margin:0 auto;padding:0 var(--pad)}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(9,11,16,.72);
  -webkit-backdrop-filter:blur(14px) saturate(120%);
  backdrop-filter:blur(14px) saturate(120%);
  border-bottom:1px solid var(--line);
}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;height:66px}
.brand{display:flex;align-items:center;gap:11px;min-width:0}
.brand-mark{height:27px;width:auto;flex:none;display:block}
.brand-txt{display:flex;flex-direction:column;line-height:1.18;min-width:0}
.brand-txt b{font-size:.86rem;font-weight:600;letter-spacing:.14em}
.brand-txt span{font-size:.6rem;color:var(--muted);letter-spacing:.22em;white-space:nowrap}
.nav{display:flex;align-items:center;gap:26px;font-size:.82rem;letter-spacing:.06em}
.nav a{color:var(--dim);transition:color .25s var(--ease);position:relative;padding:2px 0}
.nav a:hover,.nav a[aria-current="page"]{color:var(--ink)}
.nav a[aria-current="page"]::after{content:"";position:absolute;left:0;right:0;bottom:-3px;height:1px;background:var(--ink);opacity:.5}
.lang{display:flex;align-items:center;gap:6px;border:1px solid var(--line-strong);border-radius:999px;
      padding:5px 12px;font-size:.7rem;letter-spacing:.14em;color:var(--dim);transition:border-color .25s,color .25s}
.lang:hover{color:var(--ink);border-color:var(--ink)}
.menu-btn{display:none;align-items:center;justify-content:center;width:38px;height:38px;
  border:1px solid var(--line-strong);border-radius:999px;background:none;color:var(--ink);cursor:pointer}

.mobile-panel{display:none;border-bottom:1px solid var(--line);background:var(--bg-soft)}
.mobile-panel.open{display:block}
.mobile-panel a{display:block;padding:14px 22px;border-top:1px solid var(--line);font-size:.9rem;color:var(--dim)}
.mobile-panel a:first-child{border-top:0}
.mobile-panel a[aria-current="page"]{color:var(--ink)}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;padding:clamp(58px,11vw,110px) 0 clamp(48px,8vw,86px)}
.hero::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(to right,var(--line) 1px,transparent 1px),
                   linear-gradient(to bottom,var(--line) 1px,transparent 1px);
  background-size:78px 78px;
  -webkit-mask-image:radial-gradient(120% 80% at 70% 0%,#000 0%,transparent 72%);
  mask-image:radial-gradient(120% 80% at 70% 0%,#000 0%,transparent 72%);
  opacity:.55;pointer-events:none;
}
.hero::after{
  content:"";position:absolute;width:520px;height:520px;right:-140px;top:-180px;border-radius:50%;
  background:radial-gradient(closest-side,rgba(220,230,243,.09),transparent 72%);pointer-events:none;
}
.hero .wrap{position:relative}
.eyebrow{display:flex;align-items:center;gap:10px;font-size:.68rem;letter-spacing:.3em;color:var(--muted);margin:0 0 26px}
.eyebrow i{width:5px;height:5px;background:var(--ink);display:block;transform:rotate(45deg);opacity:.8}
h1.display{
  margin:0 0 26px;font-size:clamp(2.5rem,9.2vw,5.4rem);line-height:1.1;font-weight:600;
  letter-spacing:.005em;
}
h1.display .line{display:block}
h1.display .dim{color:#77839A}
.hero p.lede{max-width:34em;color:var(--dim);font-size:clamp(.95rem,2.6vw,1.06rem);margin:0 0 34px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-flex;align-items:center;gap:10px;padding:12px 22px;border-radius:999px;
     border:1px solid var(--line-strong);font-size:.86rem;letter-spacing:.06em;color:var(--ink);
     transition:background .3s var(--ease),border-color .3s var(--ease),transform .3s var(--ease)}
.btn:hover{background:rgba(220,230,243,.06);border-color:var(--ink)}
.btn.primary{background:var(--ink);color:#0A0D13;border-color:var(--ink);font-weight:600}
.btn.primary:hover{background:#fff;border-color:#fff}
.btn .arw{transition:transform .3s var(--ease)}
.btn:hover .arw{transform:translateX(4px)}
.hero-meta{display:flex;flex-wrap:wrap;gap:10px 30px;margin-top:56px;padding-top:20px;border-top:1px solid var(--line);
  font-size:.66rem;letter-spacing:.22em;color:var(--muted);text-transform:uppercase}

/* ---------- sections ---------- */
.section{padding:clamp(56px,9vw,96px) 0;border-top:1px solid var(--line)}
.section.plain{border-top:0}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:clamp(26px,4vw,42px)}
.sec-head .kicker{display:flex;align-items:baseline;gap:6px;font-size:.68rem;letter-spacing:.26em;color:var(--muted);margin:0 0 12px}
.sec-head .kicker b{color:var(--ink);font-weight:500}
.sec-head h2{margin:0;font-size:clamp(1.4rem,4.4vw,2.1rem);font-weight:600;letter-spacing:.02em;line-height:1.3}
.sec-head .more{font-size:.8rem;color:var(--dim);white-space:nowrap;border-bottom:1px solid var(--line-strong);padding-bottom:3px}
.sec-head .more:hover{color:var(--ink);border-bottom-color:var(--ink)}

/* rows (projects) */
.rows{border-top:1px solid var(--line)}
.row{display:grid;grid-template-columns:64px 1fr auto;gap:8px 20px;align-items:start;
  padding:24px 4px;border-bottom:1px solid var(--line);transition:background .3s var(--ease)}
.row:hover{background:rgba(220,230,243,.025)}
.row .idx{font-size:.72rem;color:var(--muted);letter-spacing:.14em;padding-top:5px}
.row h3{margin:0 0 6px;font-size:1.05rem;font-weight:600;letter-spacing:.02em;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.row h3 a:hover{text-decoration:underline;text-underline-offset:5px;text-decoration-color:var(--line-strong)}
.row p{margin:0;color:var(--dim);font-size:.88rem;max-width:44em}
.row .side{text-align:right;display:flex;flex-direction:column;align-items:flex-end;gap:8px}
.pill{font-size:.66rem;letter-spacing:.12em;padding:4px 10px;border-radius:999px;
      border:1px solid var(--line-strong);color:var(--dim);white-space:nowrap}
.pill.live{color:#0A0D13;background:var(--ink);border-color:var(--ink);font-weight:600}
.pill.wip{color:var(--ink);border-color:var(--line-strong)}
.pill.idea{color:var(--muted)}
.row .url{font-size:.74rem;color:var(--muted);letter-spacing:.04em}

/* cards */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:24px 22px;
  display:flex;flex-direction:column;gap:12px;min-height:180px;transition:border-color .3s var(--ease),transform .4s var(--ease)}
.card:hover{border-color:var(--line-strong);transform:translateY(-2px)}
.card .card-top{display:flex;align-items:center;justify-content:space-between;font-size:.68rem;letter-spacing:.16em;color:var(--muted)}
.card h3{margin:0;font-size:1.02rem;font-weight:600}
.card p{margin:0;color:var(--dim);font-size:.86rem}
.card .go{margin-top:auto;font-size:.78rem;color:var(--dim);display:inline-flex;gap:8px;align-items:center}
.card:hover .go{color:var(--ink)}

/* intro / about */
.intro-grid{display:grid;grid-template-columns:1.25fr 1fr;gap:clamp(24px,5vw,64px);align-items:start}
.intro-grid p{color:var(--dim);margin:0 0 18px;font-size:.98rem;max-width:36em}
.intro-grid p strong{color:var(--ink);font-weight:600}
.facts{border-left:1px solid var(--line);padding-left:22px;display:grid;gap:18px}
.fact .k{font-size:.64rem;letter-spacing:.22em;color:var(--muted);display:block;margin-bottom:4px}
.fact .v{font-size:.9rem}

/* prose pages */
.page-head{padding:clamp(48px,8vw,86px) 0 clamp(26px,4vw,40px);border-bottom:1px solid var(--line)}
.page-head .kicker{font-size:.68rem;letter-spacing:.28em;color:var(--muted);margin:0 0 14px}
.page-head h1{margin:0 0 14px;font-size:clamp(1.9rem,6vw,3rem);font-weight:600;line-height:1.2;letter-spacing:.01em}
.page-head p{margin:0;color:var(--dim);max-width:38em;font-size:.95rem}
.prose{max-width:760px;padding:clamp(34px,6vw,58px) 0 clamp(56px,8vw,80px)}
.prose h2{font-size:1.06rem;font-weight:600;margin:38px 0 10px;letter-spacing:.03em}
.prose h2:first-child{margin-top:0}
.prose p{color:var(--dim);margin:0 0 14px;font-size:.93rem}
.prose ul{color:var(--dim);font-size:.93rem;margin:0 0 14px;padding-left:18px}
.prose li{margin:0 0 8px}
.prose .updated{font-size:.74rem;letter-spacing:.1em;color:var(--muted);margin-bottom:28px}
.prose a{border-bottom:1px solid var(--line-strong)}
.prose a:hover{border-bottom-color:var(--ink)}

/* directions list (about) */
.dir{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:8px}
.dir .item{border-top:1px solid var(--line-strong);padding-top:14px}
.dir .item b{display:block;font-size:.95rem;font-weight:600;margin-bottom:6px}
.dir .item span{color:var(--dim);font-size:.85rem}

/* contact */
.mail-list{border-top:1px solid var(--line);max-width:820px}
.mail-row{display:grid;grid-template-columns:170px 1fr;gap:6px 18px;align-items:baseline;
  padding:20px 2px;border-bottom:1px solid var(--line)}
.mail-row .label{font-size:.72rem;letter-spacing:.18em;color:var(--muted)}
.mail-row a{font-size:1rem;letter-spacing:.02em;display:inline-flex;align-items:center;gap:8px}
.mail-row a:hover{text-decoration:underline;text-underline-offset:6px;text-decoration-color:var(--line-strong)}
.mail-row small{display:block;color:var(--dim);font-size:.8rem;margin-top:4px}

/* CTA band */
.band{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:clamp(40px,7vw,64px) 0}
.band .wrap{display:flex;flex-wrap:wrap;gap:20px;align-items:center;justify-content:space-between}
.band h2{margin:0;font-size:clamp(1.25rem,4vw,1.75rem);font-weight:600}
.band p{margin:6px 0 0;color:var(--dim);font-size:.86rem}

/* footer */
.site-footer{border-top:1px solid var(--line);padding:clamp(38px,6vw,56px) 0 34px;font-size:.82rem}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:26px}
.foot-brand{display:flex;gap:12px;align-items:flex-start}
.foot-brand .brand-mark{height:32px;width:auto}
.foot-brand b{font-size:.86rem;letter-spacing:.14em;font-weight:600}
.foot-brand span{display:block;font-size:.66rem;color:var(--muted);letter-spacing:.2em;margin-top:3px}
.foot-desc{color:var(--muted);margin:12px 0 0;max-width:26em;line-height:1.7}
.foot-col h4{margin:0 0 12px;font-size:.64rem;letter-spacing:.22em;color:var(--muted);font-weight:500}
.foot-col a{display:block;color:var(--dim);padding:3px 0}
.foot-col a:hover{color:var(--ink)}
.foot-bottom{display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between;
  margin-top:38px;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:.72rem;letter-spacing:.06em}

/* reveal */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* skip link */
.skip{position:absolute;left:-9999px;top:0;background:var(--ink);color:#0A0D13;padding:10px 16px;z-index:99}
.skip:focus{left:8px;top:8px}

@media (max-width:860px){
  .nav{display:none}
  .menu-btn{display:flex}
  .intro-grid{grid-template-columns:1fr}
  .facts{border-left:0;border-top:1px solid var(--line);padding-left:0;padding-top:20px;grid-template-columns:1fr 1fr}
  .dir{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .row{grid-template-columns:44px 1fr;gap:4px 14px}
  .row .side{grid-column:2;align-items:flex-start;text-align:left;flex-direction:row;align-items:center;gap:12px}
  .mail-row{grid-template-columns:1fr}
}
@media (max-width:520px){
  .sec-head{flex-direction:column;align-items:flex-start;gap:12px}
  .brand-txt span{display:none}
  .foot-grid{grid-template-columns:1fr;gap:22px}
  .hero-meta{gap:8px 18px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
  html{scroll-behavior:auto}
}