/* ============================================================
   Sungjin Choi — custom landing page
   Dark + gold, serif display. Self-contained (no Minimal Mistakes).
   ============================================================ */

:root {
  --navy:      #0a1525;
  --navy-2:    #0d1b2e;
  --ink:       #15202b;
  --cream:     #f6f4ee;
  --cream-2:   #efece3;
  --gold:      #c79a5b;
  --gold-soft: #d8b87f;
  --muted:     #8a93a0;
  --muted-d:   #5b6573;
  --line:      rgba(255,255,255,.10);
  --line-d:    #e4e0d6;
  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --wrap: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--cream);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 28px; }
.eyebrow {
  font-size: .74rem; letter-spacing: .22em; text-transform: uppercase;
  color: var(--gold); font-weight: 600;
}
.serif { font-family: var(--serif); }

/* ---------- top nav ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 28px; transition: background .3s, padding .3s, box-shadow .3s;
}
.nav.scrolled {
  background: rgba(10,21,37,.92); backdrop-filter: blur(10px);
  padding: 12px 28px; box-shadow: 0 1px 0 var(--line);
}
.nav .brand { display: flex; align-items: center; gap: 12px; color: #fff; }
.nav .mark {
  width: 40px; height: 40px; border: 1.5px solid var(--gold); border-radius: 8px;
  display: grid; place-items: center; font-family: var(--serif);
  font-weight: 600; color: var(--gold); font-size: 1.05rem;
}
.nav .brand b { font-weight: 600; letter-spacing: .02em; font-size: .98rem; }
.nav .brand span { display: block; font-size: .64rem; letter-spacing: .2em;
  text-transform: uppercase; color: var(--muted); margin-top: 2px; }
.nav .links { display: flex; align-items: center; gap: 30px; }
.nav .links a { color: #d7dbe2; font-size: .82rem; letter-spacing: .06em;
  text-transform: uppercase; font-weight: 500; transition: color .2s; }
.nav .links a:hover { color: var(--gold); }
.btn-gold {
  border: 1px solid var(--gold); color: var(--gold) !important;
  padding: 10px 18px; border-radius: 6px; font-size: .78rem !important;
  display: inline-flex; align-items: center; gap: 8px; transition: all .2s;
}
.btn-gold:hover { background: var(--gold); color: var(--navy) !important; }
.nav-toggle { display: none; background: none; border: 0; color: #fff;
  font-size: 1.5rem; cursor: pointer; }

/* ---------- hero ---------- */
.hero {
  position: relative; background: var(--navy); color: #eef1f6;
  padding: 170px 0 130px; overflow: hidden;
}
.hero canvas { position: absolute; inset: 0; width: 100%; height: 100%;
  z-index: 0; opacity: .9; }
.hero::after { /* fade graphic toward the left where text sits */
  content: ""; position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(105deg, var(--navy) 32%, rgba(10,21,37,.55) 60%, rgba(10,21,37,.15) 100%);
}
.hero .wrap { position: relative; z-index: 2; }
.hero h1 {
  font-family: var(--serif); font-weight: 600; font-size: clamp(2.5rem, 5.4vw, 4.4rem);
  line-height: 1.04; letter-spacing: -.01em; margin: 18px 0 22px; max-width: 14ch;
}
.hero h1 .hl { color: var(--gold); font-style: italic; }
.hero p.lead { font-size: 1.08rem; color: #b9c1cd; max-width: 46ch; margin: 0 0 34px; }
.hero .cta { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary {
  background: var(--gold); color: var(--navy); font-weight: 600;
  padding: 14px 26px; border-radius: 7px; font-size: .82rem; letter-spacing: .08em;
  text-transform: uppercase; display: inline-flex; align-items: center; gap: 10px;
  transition: transform .15s, box-shadow .2s;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(199,154,91,.3); }
.btn-ghost {
  border: 1px solid rgba(255,255,255,.28); color: #eef1f6; font-weight: 600;
  padding: 14px 26px; border-radius: 7px; font-size: .82rem; letter-spacing: .08em;
  text-transform: uppercase; display: inline-flex; align-items: center; gap: 10px;
  transition: border-color .2s, color .2s;
}
.btn-ghost:hover { border-color: var(--gold); color: var(--gold); }

/* ---------- section scaffolding ---------- */
section { padding: 96px 0; }
.sec-head { margin-bottom: 46px; }
.sec-head h2 { font-family: var(--serif); font-weight: 600;
  font-size: clamp(1.9rem, 3.4vw, 2.7rem); margin: 8px 0 0; letter-spacing: -.01em; }
.sec-head .row { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; }
.sec-head a.more { color: var(--gold); font-size: .78rem; letter-spacing: .12em;
  text-transform: uppercase; font-weight: 600; white-space: nowrap; }

/* ---------- projects ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.card {
  background: #fff; border: 1px solid var(--line-d); border-radius: 12px;
  overflow: hidden; display: flex; flex-direction: column;
  transition: transform .2s, box-shadow .25s, border-color .2s;
}
.card:hover { transform: translateY(-5px); box-shadow: 0 18px 40px rgba(20,32,43,.12);
  border-color: #d8d2c4; }
.card .thumb { height: 168px; position: relative; display: grid; place-items: center;
  background: var(--navy); overflow: hidden; }
.card .thumb .glow { position: absolute; inset: 0; opacity: .85; }
.card .thumb .tag-ico { position: relative; z-index: 1; color: #fff; opacity: .92;
  font-size: 2.2rem; }
.card .thumb .thumb-img { width: 100%; height: 100%; object-fit: cover; }
.card .body { padding: 22px 22px 24px; display: flex; flex-direction: column; flex: 1; }
.card h3 { font-family: var(--serif); font-weight: 600; font-size: 1.22rem; margin: 0 0 8px; }
.card p { color: var(--muted-d); font-size: .92rem; margin: 0 0 16px; flex: 1; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tags span { font-size: .72rem; color: #51596a; background: var(--cream-2);
  border: 1px solid var(--line-d); padding: 4px 10px; border-radius: 999px; }
.card .links { margin-top: 16px; display: flex; gap: 16px; }
.card .links a { font-size: .76rem; letter-spacing: .08em; text-transform: uppercase;
  font-weight: 600; color: var(--gold); }
.card .links a:hover { text-decoration: underline; }

/* ---------- about ---------- */
.about { background: var(--cream-2); }
.about .grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 56px; align-items: center; }
.about .photo {
  aspect-ratio: 4/5; border-radius: 14px; background:
    linear-gradient(160deg, #1c2c44, #0a1525);
  position: relative; overflow: hidden; border: 1px solid var(--line-d);
  display: grid; place-items: center;
}
.about .photo img { width: 100%; height: 100%; object-fit: cover; }
.about .photo .ph { color: var(--muted); font-size: .8rem; letter-spacing: .15em;
  text-transform: uppercase; text-align: center; padding: 0 20px; }
.about h2 { font-family: var(--serif); font-weight: 600;
  font-size: clamp(1.8rem, 3.2vw, 2.5rem); margin: 8px 0 18px; letter-spacing: -.01em; }
.about p { color: #404a57; margin: 0 0 16px; }
.stats { display: flex; gap: 38px; margin-top: 30px; flex-wrap: wrap; }
.stats .n { font-family: var(--serif); font-size: 2.1rem; font-weight: 600; color: var(--gold); }
.stats .l { font-size: .78rem; color: var(--muted-d); letter-spacing: .04em; }

/* ---------- skills / tech ---------- */
.tech .strip { display: flex; flex-wrap: wrap; gap: 14px 18px; }
.tech .chip {
  display: inline-flex; align-items: center; gap: 9px; padding: 11px 18px;
  border: 1px solid var(--line-d); border-radius: 10px; background: #fff;
  font-weight: 500; font-size: .92rem; color: var(--ink);
  transition: border-color .2s, transform .15s;
}
.tech .chip:hover { border-color: var(--gold); transform: translateY(-2px); }
.tech .chip i { width: 8px; height: 8px; border-radius: 50%; background: var(--gold); }

/* ---------- cta ---------- */
.cta-band { background: var(--navy); color: #eef1f6; border-radius: 0; }
.cta-band .inner {
  display: flex; align-items: center; justify-content: space-between; gap: 28px;
  flex-wrap: wrap;
}
.cta-band .icon { width: 58px; height: 58px; border: 1.5px solid var(--gold);
  border-radius: 50%; display: grid; place-items: center; color: var(--gold); font-size: 1.4rem; }
.cta-band h2 { font-family: var(--serif); font-weight: 600; font-size: 1.9rem; margin: 0 0 6px; }
.cta-band p { color: #aeb7c4; margin: 0; }
.cta-left { display: flex; align-items: center; gap: 22px; }

/* ---------- footer ---------- */
footer { background: var(--ink); color: #c7ccd5; padding: 30px 0; }
footer .inner { display: flex; align-items: center; justify-content: space-between;
  gap: 18px; flex-wrap: wrap; }
footer .brand { display: flex; align-items: center; gap: 12px; }
footer .brand .mark { width: 34px; height: 34px; border: 1.5px solid var(--gold);
  border-radius: 7px; display: grid; place-items: center; color: var(--gold);
  font-family: var(--serif); }
footer small { color: var(--muted); }
footer .social { display: flex; gap: 14px; }
footer .social a { width: 36px; height: 36px; border: 1px solid var(--line);
  border-radius: 50%; display: grid; place-items: center; color: #c7ccd5; transition: all .2s; }
footer .social a:hover { border-color: var(--gold); color: var(--gold); }

/* reveal-on-scroll */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- projects page ---------- */
.proj-hero { position: relative; background: var(--navy); color: #eef1f6;
  padding: 150px 0 70px; overflow: hidden; }
.proj-hero canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; opacity: .8; }
.proj-hero::after { content: ""; position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(105deg, var(--navy) 30%, rgba(10,21,37,.5) 70%, rgba(10,21,37,.1) 100%); }
.proj-hero .wrap { position: relative; z-index: 2; }
.proj-hero h1 { font-family: var(--serif); font-weight: 600; font-size: clamp(2.2rem, 4.4vw, 3.4rem);
  margin: 14px 0 14px; }
.proj-hero p.lead { color: #b9c1cd; max-width: 52ch; margin: 0; }

.projects-section { padding: 56px 0 96px; }
.filter-bar { margin-bottom: 38px; }
.proj-search {
  width: 100%; max-width: 460px; padding: 13px 18px; font-size: .95rem; font-family: var(--sans);
  border: 1px solid var(--line-d); border-radius: 10px; background: #fff; color: var(--ink);
  margin-bottom: 20px; transition: border-color .2s, box-shadow .2s;
}
.proj-search:focus { outline: none; border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(199,154,91,.15); }
.tag-filter { display: flex; flex-direction: column; gap: 18px; }
.tag-filter > .fchip { align-self: flex-start; }
.fgroup { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.fgroup-label { width: 100%; font-size: .68rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--muted-d); font-weight: 600; margin-bottom: 1px; }
.fchip {
  font-family: var(--sans); font-size: .82rem; font-weight: 500; cursor: pointer;
  padding: 8px 15px; border-radius: 999px; border: 1px solid var(--line-d);
  background: #fff; color: #51596a; transition: all .18s;
}
.fchip:hover { border-color: var(--gold); color: var(--ink); }
.fchip.active { background: var(--navy); border-color: var(--navy); color: #fff; }
.fchip.active[data-tag="*"] { background: var(--gold); border-color: var(--gold); color: var(--navy); }
.proj-count { margin: 22px 0 0; font-size: .82rem; color: var(--muted-d); letter-spacing: .03em; }
.card.hide { display: none; }
.proj-empty { text-align: center; padding: 50px 0; color: var(--muted-d); font-size: 1rem; }
.link-reset { background: none; border: 0; color: var(--gold); font-weight: 600;
  cursor: pointer; text-decoration: underline; font-size: 1rem; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .cards { grid-template-columns: 1fr 1fr; }
  .about .grid { grid-template-columns: 1fr; gap: 32px; }
  .about .photo { max-width: 360px; }
}
@media (max-width: 760px) {
  .nav .links { position: fixed; inset: 64px 0 auto 0; flex-direction: column;
    background: rgba(10,21,37,.97); padding: 24px 28px; gap: 20px;
    transform: translateY(-130%); transition: transform .3s; align-items: flex-start; }
  .nav .links.open { transform: none; }
  .nav-toggle { display: block; }
  .cards { grid-template-columns: 1fr; }
  section { padding: 72px 0; }
  .hero { padding: 140px 0 100px; }
}