/* yyt.app portal — bold editorial (showcasy-style) shared styles
   Used by /index.html (home) and /about/index.html. Light-only by design. */

:root{
  color-scheme: light;
  --ink:#0b0b0d;
  --ink-soft:#26262b;
  --muted:#bcbcc2;         /* light-gray highlight text in headlines */
  --sub:#6a6a70;           /* secondary body text */
  --line:rgba(11,11,13,.12);
  --line-2:rgba(11,11,13,.2);
  --bg:#ffffff;
  --panel:#f3f3f4;
  --panel-2:#ededee;
  --radius:22px;
  --radius-sm:999px;
  --maxw:1240px;
  --pad:clamp(20px,4.5vw,56px);
  --font:-apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter",
         "Helvetica Neue", "Segoe UI", system-ui,
         "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  font-family:var(--font);background:var(--bg);color:var(--ink);
  line-height:1.5;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  min-height:100dvh;display:flex;flex-direction:column;overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
::selection{background:var(--ink);color:#fff}

.shell{width:100%;max-width:var(--maxw);margin:0 auto;padding-inline:var(--pad)}

/* ---------- Nav ---------- */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.82);
     backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);
     border-bottom:1px solid transparent;transition:border-color .3s}
.nav.scrolled{border-bottom-color:var(--line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:clamp(66px,9vw,88px)}
.brand{font-size:clamp(20px,2.4vw,25px);font-weight:800;letter-spacing:-.045em}
.brand .dim{color:var(--muted)}
.nav-actions{display:flex;align-items:center;gap:10px}
.pill{display:inline-flex;align-items:center;gap:9px;height:46px;padding:0 20px;border-radius:999px;
      border:1px solid var(--line-2);font-weight:600;font-size:15px;letter-spacing:-.01em;
      transition:background .25s,color .25s,border-color .25s,transform .25s;white-space:nowrap}
.pill .a{transition:transform .3s cubic-bezier(.2,.7,.2,1)}
.pill:hover{background:var(--ink);color:#fff;border-color:var(--ink)}
.pill:hover .a{transform:translateX(4px)}
.pill-dark{background:var(--ink);color:#fff;border-color:var(--ink);height:clamp(52px,6vw,62px);padding:0 26px;font-size:clamp(15px,1.6vw,17px)}
.pill-dark:hover{background:#fff;color:var(--ink);border-color:var(--ink)}
.pill-dark:hover .a{transform:translate(4px,-4px)}
.menu-btn{width:46px;height:46px;border-radius:999px;border:1px solid var(--line-2);background:transparent;
          display:grid;place-items:center;cursor:pointer;transition:background .25s,border-color .25s}
.menu-btn:hover{background:var(--panel)}
.menu-btn span{display:block;width:17px;height:1.7px;background:var(--ink);border-radius:2px;position:relative}
.menu-btn span+span{margin-top:4.5px}

/* ---------- Overlay menu ---------- */
.overlay{position:fixed;inset:0;z-index:60;background:var(--bg);
         display:flex;flex-direction:column;padding:var(--pad);
         opacity:0;visibility:hidden;transform:translateY(-8px);
         transition:opacity .3s,transform .35s cubic-bezier(.2,.7,.2,1),visibility .3s}
.overlay.open{opacity:1;visibility:visible;transform:none}
.overlay-top{display:flex;align-items:center;justify-content:space-between;height:clamp(66px,9vw,88px)}
.overlay-close{width:46px;height:46px;border-radius:999px;border:1px solid var(--line-2);background:transparent;
               font-size:22px;line-height:1;cursor:pointer;display:grid;place-items:center}
.overlay-links{flex:1;display:flex;flex-direction:column;justify-content:center;gap:clamp(6px,1.4vw,14px)}
.overlay-links a{font-size:clamp(38px,11vw,88px);font-weight:800;letter-spacing:-.04em;line-height:1.02;
                 color:var(--ink);width:max-content;max-width:100%;transition:color .2s}
.overlay-links a .idx{font-size:.28em;font-weight:600;color:var(--muted);vertical-align:super;margin-right:.5em}
.overlay-links a:hover{color:var(--sub)}
.overlay-foot{display:flex;flex-wrap:wrap;gap:8px 22px;color:var(--sub);font-size:15px;padding-top:14px;border-top:1px solid var(--line)}
.overlay-foot a:hover{color:var(--ink)}

/* ---------- Shared type ---------- */
.eyebrow{font-size:clamp(17px,2.2vw,22px);font-weight:500;color:var(--ink-soft);letter-spacing:-.01em}
.display{font-weight:800;letter-spacing:-.035em;line-height:.94;
         font-size:clamp(46px,10.5vw,138px)}
.display .mut{color:var(--muted)}
h2.section{font-weight:800;letter-spacing:-.03em;line-height:1;font-size:clamp(30px,5vw,58px)}
.lead{font-size:clamp(16px,1.9vw,21px);color:var(--sub);line-height:1.5;letter-spacing:-.01em}

/* ---------- Hero (home) ---------- */
.hero{padding-top:clamp(34px,6vw,80px);padding-bottom:clamp(40px,7vw,96px)}
.hero .eyebrow{margin-bottom:clamp(16px,2.4vw,28px)}
.hero-foot{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:clamp(22px,4vw,48px);
           margin-top:clamp(30px,4.5vw,52px)}
.hero-foot .lead{max-width:34ch}

/* ---------- Works (home) ---------- */
.works{padding-block:clamp(30px,5vw,64px)}
.works-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;
            padding-bottom:clamp(18px,2.4vw,30px);border-bottom:1px solid var(--ink)}
.works-head .count{font-size:15px;color:var(--sub);font-weight:600}
.work{display:grid;grid-template-columns:auto 1fr auto;gap:clamp(16px,3vw,40px);align-items:center;
      padding:clamp(26px,4vw,52px) 0;border-bottom:1px solid var(--line);position:relative}
.work .idx{font-size:15px;font-weight:600;color:var(--muted);font-variant-numeric:tabular-nums;padding-top:.5em;align-self:start}
.work-main{min-width:0}
.work-title{display:flex;align-items:center;gap:clamp(12px,1.6vw,20px);flex-wrap:wrap}
.work-title h3{font-weight:800;letter-spacing:-.035em;line-height:1;font-size:clamp(34px,6.4vw,84px);
               transition:transform .35s cubic-bezier(.2,.7,.2,1)}
.work-title .zh{font-weight:700}
.work-ic{width:clamp(40px,5vw,60px);height:clamp(40px,5vw,60px);border-radius:14px;border:1px solid var(--line);flex:none;background:var(--panel)}
.work-desc{margin-top:14px;color:var(--sub);font-size:clamp(15px,1.7vw,18px);max-width:58ch;line-height:1.5}
.work-tags{margin-top:16px;display:flex;flex-wrap:wrap;gap:8px}
.tag{font-size:13px;font-weight:600;color:var(--ink-soft);border:1px solid var(--line);border-radius:999px;padding:6px 13px}
.work-go{display:flex;align-items:center;gap:12px;color:var(--sub);font-weight:600;font-size:15px;white-space:nowrap;align-self:center}
.work-go .host{font-variant-numeric:tabular-nums}
.work-arrow{width:clamp(48px,5.5vw,66px);height:clamp(48px,5.5vw,66px);border-radius:999px;border:1px solid var(--line-2);
            display:grid;place-items:center;flex:none;transition:background .3s,border-color .3s}
.work-arrow svg{transition:transform .35s cubic-bezier(.2,.7,.2,1)}
.work:hover .work-title h3{transform:translateX(10px)}
.work:hover .work-arrow{background:var(--ink);border-color:var(--ink)}
.work:hover .work-arrow svg{transform:translate(3px,-3px)}
.work:hover .work-arrow svg path{stroke:#fff}
.soon-row{display:flex;align-items:center;justify-content:space-between;gap:16px;
          padding:clamp(22px,3vw,34px) 0;color:var(--muted)}
.soon-row .l{font-weight:700;letter-spacing:-.02em;font-size:clamp(18px,2.4vw,26px)}
.soon-row .r{font-size:14px}

/* ---------- About page ---------- */
.about-hero{padding-top:clamp(30px,5vw,68px);padding-bottom:clamp(24px,3vw,40px)}
.about-hero .display{max-width:15ch}
.about-lead{max-width:60ch;margin-top:clamp(20px,2.6vw,34px);font-size:clamp(17px,2vw,23px);color:var(--ink-soft);line-height:1.45}
.about-media{margin-block:clamp(24px,4vw,52px);border-radius:var(--radius);overflow:hidden;
             aspect-ratio:16/8.2;background:
             radial-gradient(120% 140% at 78% -20%, #17171b 0%, #0b0b0d 46%, #050506 100%);
             display:grid;place-items:center;position:relative;border:1px solid var(--line)}
.about-media .word{font-weight:800;letter-spacing:-.06em;font-size:clamp(64px,17vw,220px);color:#fff;opacity:.96}
.about-media .word .dim{color:rgba(255,255,255,.32)}
.about-media .tagline{position:absolute;left:clamp(18px,3vw,34px);bottom:clamp(16px,2.6vw,28px);
                      color:rgba(255,255,255,.6);font-size:clamp(13px,1.5vw,16px);font-weight:500;letter-spacing:.01em}
.about-grid{display:grid;grid-template-columns:1.7fr .9fr;gap:clamp(30px,5vw,72px);
            padding-top:clamp(16px,3vw,36px)}
.about-statement{font-weight:800;letter-spacing:-.03em;line-height:1.04;font-size:clamp(26px,3.8vw,46px);margin-bottom:clamp(22px,3vw,38px)}
.about-statement .mut{color:var(--muted)}
.about-cols{columns:2;column-gap:clamp(24px,3vw,44px)}
.about-cols p{break-inside:avoid;color:var(--sub);font-size:clamp(15px,1.5vw,17px);line-height:1.62;margin-bottom:1.1em}
.side-block{border-top:1px solid var(--ink);padding-top:18px;margin-bottom:clamp(30px,4vw,44px)}
.side-block .k{font-size:13px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--sub);margin-bottom:16px}
.stat{font-weight:800;letter-spacing:-.03em;line-height:1;font-size:clamp(40px,5vw,60px)}
.stat + .stat-sub{color:var(--sub);font-size:15px;margin-top:8px}
.proj-list{display:flex;flex-direction:column}
.proj{display:flex;align-items:baseline;justify-content:space-between;gap:14px;
      padding:15px 0;border-bottom:1px solid var(--line)}
.proj:first-child{padding-top:0}
.proj .name{font-weight:700;letter-spacing:-.02em;font-size:clamp(17px,1.9vw,20px)}
.proj .meta{color:var(--sub);font-size:13.5px}
.proj:hover .name{color:var(--sub)}

/* ---------- Footer ---------- */
.foot{margin-top:auto;border-top:1px solid var(--line);padding-block:clamp(30px,4vw,46px)}
.foot-in{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px 28px}
.foot .brand{font-size:20px}
.foot-links{display:flex;flex-wrap:wrap;gap:8px 22px;color:var(--sub);font-size:15px}
.foot-links a{transition:color .2s}
.foot-links a:hover{color:var(--ink)}
.foot .copy{color:var(--muted);font-size:13.5px;width:100%;order:3}

/* ---------- Responsive ---------- */
@media (max-width:820px){
  .about-grid{grid-template-columns:1fr;gap:clamp(28px,6vw,40px)}
  .about-cols{columns:1}
  .hero-foot{flex-direction:column;align-items:flex-start}
  .hero-foot .lead{max-width:100%}
}
@media (max-width:640px){
  .nav-actions .pill:not(.menu-btn){display:none}
  .work{grid-template-columns:auto 1fr;gap:14px}
  .work-go{display:none}
  .work-title h3{font-size:clamp(30px,10vw,52px)}
  .about-media{aspect-ratio:4/3}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto}}