/* ============================================================
   Sehyoung Hamjong — Portfolio design system (Option D)
   Light = UX / editorial · Dark = Industrial Design
   ============================================================ */
:root{
  /* light */
  --bg:#faf9f6; --ink:#171512; --muted:#8a8781; --muted-2:#6b6862;
  --hair:rgba(0,0,0,.09);
  /* dark */
  --dark:#171410; --dark-2:#221e18; --on-dark:#f1ede5; --on-dark-muted:#a29a8c;
  --dark-hair:rgba(255,255,255,.1);
  /* accent */
  --accent:#e8501f;
  /* type */
  --sans:'Space Grotesk',system-ui,sans-serif;
  --serif:'Newsreader',Georgia,serif;
  /* layout */
  --maxw:1240px; --gut:clamp(20px,4vw,40px);
  --ease:cubic-bezier(.2,.7,.2,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased;line-height:1.55;font-size:16px}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
::selection{background:var(--accent);color:#fff}

.wrap{max-width:var(--maxw);margin:0 auto;padding-inline:var(--gut)}
.em{font-family:var(--serif);font-style:italic;font-weight:500}
.eyebrow{font-family:var(--serif);font-style:italic;font-size:17px;color:var(--muted-2);display:inline-flex;align-items:center;gap:10px}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--accent)}
.kicker{font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.09em;color:var(--muted)}

/* ---------- nav ---------- */
nav.site{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--hair)}
.nav-in{display:flex;justify-content:space-between;align-items:center;padding:22px var(--gut);max-width:var(--maxw);margin:0 auto;flex-wrap:wrap;gap:10px}
.brand{font-size:16px;font-weight:600;letter-spacing:-.01em}
.brand b{color:var(--accent)}
.links{display:flex;gap:clamp(16px,3vw,34px);font-size:13px;font-weight:500}
.links a{color:var(--muted);padding-bottom:2px;transition:color .2s}
.links a:hover{color:var(--ink)}
.links a.active{color:var(--ink);border-bottom:2px solid var(--accent)}

/* ---------- hero ---------- */
.hero{padding:clamp(56px,9vw,100px) 0 clamp(48px,7vw,72px)}
.hero .eyebrow{margin-bottom:20px}
.hero h1{font-size:clamp(38px,6.5vw,64px);line-height:1.05;font-weight:600;letter-spacing:-.025em;max-width:16ch}
.hero p.lead{margin-top:24px;max-width:52ch;font-size:clamp(15px,1.7vw,19px);color:var(--muted-2)}
.hero .meta{margin-top:32px;display:flex;gap:26px;flex-wrap:wrap;font-size:14px;color:var(--muted)}
.hero .meta b{color:var(--ink);font-weight:600}

/* page-level hero (inner pages) */
.page-hero{padding:clamp(48px,7vw,80px) 0 clamp(32px,5vw,48px)}
.page-hero .eyebrow{margin-bottom:16px}
.page-hero h1{font-size:clamp(32px,5vw,52px);line-height:1.08;font-weight:600;letter-spacing:-.025em}
.page-hero p.lead{margin-top:18px;max-width:56ch;font-size:clamp(15px,1.6vw,18px);color:var(--muted-2)}

/* ---------- sections & grids ---------- */
section{scroll-margin-top:90px}
.sec-head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;margin-bottom:26px}
.sec-head h2{font-size:clamp(24px,3.4vw,34px);font-weight:600;letter-spacing:-.02em}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.card{display:block}
.thumb{aspect-ratio:4/3;border-radius:6px;overflow:hidden;position:relative;
  background:repeating-linear-gradient(45deg,#ecebe6,#ecebe6 10px,#f2f1ec 10px,#f2f1ec 20px);
  display:flex;align-items:center;justify-content:center;text-align:center;color:#a5a29b;
  font:11px ui-monospace,Menlo,monospace;padding:10px;transition:opacity .25s}
.thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:top}
.card:hover .thumb{opacity:.82}
/* hover-scroll preview: gently browse a full-page screenshot on hover */
.thumb.scrollcap img{position:absolute;inset:auto;top:0;left:0;width:100%;height:auto;object-fit:unset;transition:transform 45s linear}
.card:hover .thumb.scrollcap{opacity:1}
.card:hover .thumb.scrollcap img{transform:translateY(-74.6%)}
@media(prefers-reduced-motion:reduce){.thumb.scrollcap img{transition:none}.card:hover .thumb.scrollcap img{transform:none}}
/* Ken Burns: slow, subtle drift-zoom on a still image */
.thumb.kb img{transition:transform 16s linear}
.card:hover .thumb.kb{opacity:1}
.card:hover .thumb.kb img{transform:scale(1.12)}
@media(prefers-reduced-motion:reduce){.thumb.kb img{transition:none}.card:hover .thumb.kb img{transform:none}}
.card h3{margin-top:14px;font-size:16px;font-weight:600}
.card .cap{font-size:13px;color:var(--muted);margin-top:3px}
.card .num{font-family:var(--serif);font-style:italic;color:var(--accent);font-size:14px;margin-top:12px;display:block}

/* ---------- dark band / dark pages ---------- */
.band-dark{background:var(--dark);color:var(--on-dark)}
.band-dark .eyebrow{color:var(--on-dark-muted)}
.band-dark .sec-head h2,.band-dark .page-hero h1{color:var(--on-dark)}
.band-dark .kicker{color:var(--on-dark-muted)}
.band-dark .card h3{color:var(--on-dark)}
.band-dark .card .cap{color:var(--on-dark-muted)}
.band-dark .thumb{background:var(--dark-2);border:1px solid var(--dark-hair);color:#6f675b}
.band-dark p.lead{color:var(--on-dark-muted)}
body.page-dark{background:var(--dark);color:var(--on-dark)}
body.page-dark nav.site{background:color-mix(in srgb,var(--dark) 85%,transparent);border-bottom-color:var(--dark-hair)}
body.page-dark .brand,body.page-dark .links a.active{color:var(--on-dark)}
body.page-dark .links a{color:var(--on-dark-muted)}
body.page-dark .links a:hover{color:var(--on-dark)}
body.page-dark .eyebrow{color:var(--on-dark-muted)}
body.page-dark .kicker{color:var(--on-dark-muted)}
body.page-dark .card h3{color:var(--on-dark)}
body.page-dark .card .cap{color:var(--on-dark-muted)}
body.page-dark .thumb{background:var(--dark-2);border:1px solid var(--dark-hair);color:#6f675b}
body.page-dark .page-hero p.lead{color:var(--on-dark-muted)}
body.page-dark footer.site{border-top-color:var(--dark-hair)}
body.page-dark .foot{color:var(--on-dark-muted)}

/* ---------- sensitive-material notice ---------- */
.notice{max-width:820px;margin:0 auto 30px;padding:13px 18px;border:1px solid var(--hair);border-left:3px solid var(--accent);border-radius:8px;background:#fffdfb;font-size:13.5px;color:var(--muted-2);line-height:1.55}
.notice b{color:var(--accent);text-transform:uppercase;letter-spacing:.06em;font-size:11.5px;font-weight:600;margin-right:9px}
body.page-dark .notice{background:var(--dark-2);border-color:var(--dark-hair);color:var(--on-dark-muted)}

/* ---------- case study article ---------- */
article.case{max-width:820px;margin:0 auto;padding:0 var(--gut) clamp(64px,10vw,110px)}
article.case > *+*{margin-top:22px}
article.case h2{font-size:clamp(22px,3vw,30px);font-weight:600;letter-spacing:-.02em;padding-top:26px}
article.case h3{font-size:18px;font-weight:600;padding-top:10px}
article.case p{color:var(--muted-2);font-size:16.5px}
article.case ul{color:var(--muted-2);padding-left:22px}
article.case ul li{margin-top:8px}
article.case figure{margin-top:30px}
article.case figure img{border-radius:6px;border:1px solid var(--hair);width:100%}
article.case figcaption{font-size:13px;color:var(--muted);margin-top:10px;font-family:var(--serif);font-style:italic}
.case-meta{display:flex;gap:40px;flex-wrap:wrap;border-top:1px solid var(--hair);border-bottom:1px solid var(--hair);padding:20px 0;margin:34px 0}
.case-meta div span{display:block;font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:600;margin-bottom:4px}
.case-meta div{font-size:15px}
.case-hero-img{border-radius:8px;border:1px solid var(--hair);width:100%;margin-top:8px}
.back{font-size:13px;color:var(--muted);display:inline-block;margin-top:26px}
.back:hover{color:var(--ink)}
.pager{display:flex;justify-content:space-between;gap:16px;max-width:820px;margin:0 auto;padding:26px var(--gut) 0;border-top:1px solid var(--hair);font-weight:600;font-size:15px}
.pager a:hover{color:var(--accent)}
.pager .dir{display:block;font-size:12px;color:var(--muted);font-weight:500;margin-bottom:4px}

/* ---------- about ---------- */
.about-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:clamp(28px,5vw,64px)}
.statement{font-size:clamp(21px,2.8vw,28px);font-weight:600;letter-spacing:-.02em;line-height:1.25}
.statement .em{color:var(--accent)}
.body-copy p{color:var(--muted-2);font-size:16px;margin-bottom:14px;max-width:54ch}
.quote{font-family:var(--serif);font-style:italic;font-size:clamp(18px,2.2vw,22px);line-height:1.5;color:#3a3833;border-left:2px solid var(--accent);padding-left:20px;margin-top:28px}
.portrait{aspect-ratio:4/5;border-radius:8px;overflow:hidden;background:repeating-linear-gradient(45deg,#ecebe6,#ecebe6 10px,#f2f1ec 10px,#f2f1ec 20px);display:flex;align-items:center;justify-content:center;color:#a5a29b;font:11px ui-monospace,Menlo,monospace;max-width:380px}

/* ---------- resume ---------- */
.res-grid{display:grid;grid-template-columns:1.6fr 1fr;gap:clamp(32px,5vw,72px);padding-bottom:clamp(64px,9vw,100px)}
.res-item{padding:24px 0;border-top:1px solid var(--hair)}
.res-item .top{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;align-items:baseline}
.res-item h3{font-size:17px;font-weight:600}
.res-item h3 span{color:var(--accent);font-weight:600}
.res-item .dates{font-size:13px;color:var(--muted)}
.res-item p{margin-top:10px;color:var(--muted-2);font-size:15px}
.res-side h4{font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);margin:26px 0 10px}
.res-side h4:first-child{margin-top:0}
.res-side p{font-size:14.5px;color:var(--muted-2)}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:14px;border:1px solid var(--ink);border-radius:99px;padding:10px 20px;transition:all .2s}
.btn:hover{background:var(--ink);color:var(--bg)}

/* ---------- contact + footer ---------- */
.contact-strip{border-top:1px solid var(--hair);padding:clamp(48px,7vw,72px) 0}
.contact-in{display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
.contact-strip h2{font-family:var(--serif);font-size:clamp(26px,4vw,40px);font-weight:500}
.contact-strip h2 .em{font-style:italic;color:var(--accent)}
a.mail{font-size:16px;font-weight:600;border-bottom:2px solid var(--accent);padding-bottom:3px}
footer.site{border-top:1px solid var(--hair)}
footer.site--spaced{margin-top:40px}
.foot{padding:20px var(--gut) 28px;display:flex;justify-content:space-between;gap:14px;font-size:12px;color:var(--muted);flex-wrap:wrap;max-width:var(--maxw);margin:0 auto}

/* ---------- responsive ---------- */
@media(max-width:860px){
  .grid{grid-template-columns:repeat(2,1fr)}
  .about-grid,.res-grid{grid-template-columns:1fr}
}
@media(max-width:540px){
  .grid{grid-template-columns:1fr}
  .links{width:100%;justify-content:flex-start}
}