/* ---------------------------------------------------------------
   Si Hong — portfolio
   Design system: 10 type roles, 9 colours, responsive, light-only
   Fonts: Familjen Grotesk (display), Hanken Grotesk (body), DM Mono (labels)
----------------------------------------------------------------*/

:root{
  /* colour kit */
  --ink:#141312;
  --paper:#F4F2EE;
  --soft:#D9D6CF;
  --body:#3A3835;
  --muted:#5C5A55;
  --muted-dark:#A8A59E;   /* labels on dark */
  --accent:#7A4DC9;       /* field purple (white text) */
  --accent-2:#9B7BE8;     /* accent text/marks on dark */
  --white:#FFFFFF;
  --card-hover:#EAE7E1;   /* home card hover (warm grey) */
  --overlay:rgba(20,19,18,.92); /* lightbox backdrop (ink @ .92) */

  /* fonts */
  --display:'Familjen Grotesk','Arial Narrow',sans-serif;
  --sans:'Hanken Grotesk','Helvetica Neue',Helvetica,sans-serif;
  --mono:'DM Mono','Courier New',monospace;

  --bg:var(--paper);
  --fg:var(--ink);
  --fg-soft:var(--body);

  --maxw:1240px;
  --measure:65ch;   /* single reading width for body text */
  --pad:96px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--fg);
  font-family:var(--sans);font-size:18px;line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-underline-offset:4px}

/* ---- type scale ---- */
.t-display-xl{font-family:var(--display);font-weight:700;font-size:clamp(44px,8vw,108px);line-height:.95;letter-spacing:-.02em;margin:0;text-wrap:balance}
.t-display-l{font-family:var(--display);font-weight:700;font-size:clamp(40px,7vw,88px);line-height:1;letter-spacing:-.02em;margin:0;text-wrap:balance}
.t-head{font-family:var(--display);font-weight:600;font-size:clamp(32px,5vw,64px);line-height:1.02;letter-spacing:-.015em;margin:0;text-wrap:balance}
.t-title{font-family:var(--display);font-weight:600;font-size:clamp(26px,3.4vw,38px);line-height:1.12;letter-spacing:-.015em;margin:0;text-wrap:pretty}
.t-subhead{font-family:var(--display);font-weight:600;font-size:clamp(22px,2.6vw,30px);line-height:1.18;letter-spacing:-.01em;margin:0;text-wrap:pretty}
.t-minihead{font-family:var(--sans);font-weight:600;font-size:clamp(18px,2vw,22px);line-height:1.45;margin:0}
.t-lead{font-family:var(--sans);font-weight:400;font-size:clamp(18px,2vw,22px);line-height:1.45;margin:0}
.t-body{font-family:var(--sans);font-weight:400;font-size:18px;line-height:1.65;margin:0}
.t-small{font-family:var(--sans);font-weight:400;font-size:16px;line-height:1.55;margin:0}
.t-label{font-family:var(--mono);font-weight:400;font-size:13px;letter-spacing:.04em;margin:0;text-transform:none}

/* ---- layout ---- */
.wrap{max-width:var(--maxw);margin:0 auto;padding-left:var(--pad);padding-right:var(--pad)}
.full{width:100%}
section{position:relative}

/* header / nav */
.site-header{background:var(--ink);color:var(--paper)}
.sticky-nav{position:sticky;top:0;z-index:100;transition:transform .3s ease;will-change:transform}
.sticky-nav.nav-hidden{transform:translateY(-100%)}
.nav{display:flex;justify-content:space-between;align-items:center;padding-top:24px;padding-bottom:24px}
.nav a{text-decoration:none}
.brand{font-family:var(--display);font-weight:700;font-size:22px;color:var(--paper);transition:opacity .2s ease}
.brand:hover{opacity:.7}
.nav-right{display:flex;gap:24px;align-items:center}
.nav-right .t-label{color:var(--paper)}
.nav-right a.t-label{position:relative;top:1px}
.nav-right a.t-label::after{content:"";position:absolute;left:0;right:0;bottom:-5px;height:2px;background:var(--accent-2);transform:scaleX(0);transform-origin:left;transition:transform .2s ease}
.nav-right a.t-label:hover::after,.nav-right a.t-label.current::after{transform:scaleX(1)}
.icon{display:inline-flex;color:var(--paper);padding:10px;margin:-10px;transition:color .2s ease}
.icon:hover{color:var(--accent-2)}
.icon svg{display:block}

/* hero (dark) */
.hero{background:var(--ink);color:var(--paper);padding:72px 0 88px}
.hero .t-display-xl{color:var(--paper);max-width:16ch}
.hero .sub{color:var(--soft);max-width:60ch;margin-top:28px}
/* buttons / links */
.textlink{font-family:var(--mono);font-size:14px;border-bottom:2px solid var(--accent-2);padding-bottom:2px;text-decoration:none;display:inline-block}

/* footer */
.site-footer{background:var(--ink);color:var(--paper);padding:96px 0 40px;margin-top:0}
.site-footer a{color:var(--paper)}
.footer-row{display:flex;justify-content:space-between;flex-wrap:wrap;gap:24px;border-top:1px solid var(--body);padding-top:28px;margin-top:56px}
.footer-links{display:flex;gap:24px}

/* utilities */
.eyebrow{font-family:var(--mono);font-size:13px;letter-spacing:.04em;color:var(--muted)}
.stack{display:flex;flex-direction:column}
.imgframe{border:2px solid var(--ink);background:var(--white);overflow:hidden}
.field-accent{background:var(--accent);color:var(--white)}
.field-ink{background:var(--ink);color:var(--paper)}
.field-soft{background:var(--soft)}

/* responsive padding */
@media (max-width:900px){
  :root{--pad:32px}
  .hero{padding:56px 0 64px}
}
@media (max-width:560px){
  :root{--pad:20px}
  body{font-size:17px}
  /* phone: credit on its own row, below the mail/LinkedIn links, wrapped to two lines */
  .footer-row{flex-direction:column;align-items:flex-start}
  .credit-built{display:block}
}

/* Lightbox (image tap-to-zoom) — mobile view only (<=820px) */
@media (max-width:820px){ img[data-zoom]{cursor:zoom-in} }
.lightbox{position:fixed;inset:0;z-index:1000;background:var(--overlay);display:flex;align-items:center;justify-content:center;padding:24px;opacity:0;pointer-events:none;transition:opacity .2s ease}
.lightbox.open{opacity:1;pointer-events:auto}
.lightbox img{max-width:96vw;max-height:92vh;width:auto;height:auto;object-fit:contain;border:2px solid var(--ink);box-shadow:0 24px 70px rgba(0,0,0,.5)}
.lightbox img.on-white{background:var(--white);padding:16px;box-sizing:border-box}
.lightbox-close{position:absolute;top:16px;right:20px;width:44px;height:44px;border:0;border-radius:999px;background:transparent;color:var(--paper);font-size:34px;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center}
.lightbox-close:hover{color:var(--accent-2)}