/* ===== Soojung Choi — Portfolio (Minimal Academic) ===== */
:root{
  --bg:#ffffff;
  --bg-soft:#f7f8fa;
  --ink:#1a1d24;
  --ink-soft:#5b6472;
  --muted:#8a93a2;
  --line:#e7eaee;
  --accent:#2f4a6b;      /* muted navy */
  --accent-soft:#eef2f7;
  --accent-ink:#26507f;
  --ok:#1f7a4d;
  --warn:#b46a12;
  --bad:#a23b3b;
  --review:#6b5bab;
  --radius:14px;
  --maxw:940px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
          "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:var(--font); font-size:16px; line-height:1.7;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
}
a{color:var(--accent-ink); text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%; height:auto}
.container{max-width:var(--maxw); margin:0 auto; padding:0 24px}

/* ---- Top nav ---- */
.nav{
  position:sticky; top:0; z-index:50; background:rgba(255,255,255,.85);
  backdrop-filter:saturate(180%) blur(10px); border-bottom:1px solid var(--line);
}
.nav .container{display:flex; align-items:center; justify-content:space-between; height:60px}
.nav .brand{font-weight:700; letter-spacing:-.01em; color:var(--ink); font-size:16px}
.nav .brand span{color:var(--accent)}
.nav nav a{
  color:var(--ink-soft); font-size:14px; margin-left:22px; font-weight:500;
}
.nav nav a:hover{color:var(--accent); text-decoration:none}
@media(max-width:680px){ .nav nav a{margin-left:14px; font-size:13px} .nav nav a.hide-sm{display:none} }

/* ---- Hero ---- */
.hero{padding:76px 0 40px; border-bottom:1px solid var(--line)}
.hero .container{display:grid; grid-template-columns:150px 1fr; gap:36px; align-items:center}
.hero .photo{
  width:150px; height:150px; border-radius:50%; object-fit:cover;
  border:1px solid var(--line); 
  object-position:center 35%;
  box-shadow:0 6px 24px rgba(20,30,50,.10);
}
.hero .overline{color:var(--accent); font-size:13px; font-weight:600; letter-spacing:.08em; text-transform:uppercase}
.hero h1{font-family:var(--serif); font-size:44px; line-height:1.1; margin:.15em 0 .1em; letter-spacing:-.01em}
.hero .role{font-size:17px; color:var(--ink-soft); font-weight:500; margin-bottom:16px}
.hero .lead{font-size:16px; color:var(--ink-soft); max-width:46em}
.hero .chips{margin-top:16px; display:flex; flex-wrap:wrap; gap:8px}
.hero .cta{margin-top:22px; display:flex; flex-wrap:wrap; gap:10px}
@media(max-width:680px){
  .hero{padding:44px 0 30px}
  .hero .container{grid-template-columns:1fr; gap:20px; text-align:left}
  .hero .photo{width:110px; height:110px}
  .hero h1{font-size:34px}
}

/* ---- Buttons & chips ---- */
.btn{
  display:inline-flex; align-items:center; gap:7px; font-size:14px; font-weight:600;
  padding:9px 16px; border-radius:999px; border:1px solid var(--line);
  color:var(--ink); background:#fff; transition:.15s;
}
.btn:hover{border-color:var(--accent); color:var(--accent); text-decoration:none; transform:translateY(-1px)}
.btn.primary{background:var(--accent); color:#fff; border-color:var(--accent)}
.btn.primary:hover{background:#243a56; color:#fff}
.chip{
  display:inline-block; font-size:12.5px; font-weight:600; color:var(--accent-ink);
  background:var(--accent-soft); border-radius:999px; padding:4px 11px; line-height:1.5;
}
.chip.plain{background:var(--bg-soft); color:var(--ink-soft)}

/* ---- Sections ---- */
section{padding:56px 0}
section + section{border-top:1px solid var(--line)}
.sec-head{margin-bottom:28px}
.sec-head .overline{color:var(--accent); font-size:12.5px; font-weight:700; letter-spacing:.1em; text-transform:uppercase}
.sec-head h2{font-family:var(--serif); font-size:29px; margin:.15em 0 0; letter-spacing:-.01em}
.sec-head p{color:var(--ink-soft); margin:.5em 0 0}

/* ---- About / How I Work ---- */
.howiwork{display:grid; grid-template-columns:repeat(3,1fr); gap:18px; margin-top:26px}
.howcard{border:1px solid var(--line); border-radius:var(--radius); padding:20px}
.howcard h4{margin:0 0 6px; font-size:15px}
.howcard p{margin:0; font-size:14px; color:var(--ink-soft)}
@media(max-width:680px){ .howiwork{grid-template-columns:1fr} }

/* ---- Project / research cards ---- */
.cards{display:grid; grid-template-columns:repeat(2,1fr); gap:18px}
.cards.one{grid-template-columns:1fr}
@media(max-width:680px){ .cards{grid-template-columns:1fr} }
/* compact 3-column variant (B.S. projects — smaller than research) */
.cards.three{grid-template-columns:repeat(3,1fr); gap:14px}
.cards.three .card{padding:16px 17px}
.cards.three .card h3{font-size:15px; margin-bottom:6px}
.cards.three .card .desc{font-size:12.5px; margin-bottom:10px}
.cards.three .card .venue{font-size:11px}
.cards.three .card .arrow{font-size:12.5px; margin-top:10px}
@media(max-width:900px){ .cards.three{grid-template-columns:1fr 1fr} }
@media(max-width:680px){ .cards.three{grid-template-columns:1fr} }
.card{
  display:flex; flex-direction:column; border:1px solid var(--line); border-radius:var(--radius);
  padding:22px; background:#fff; transition:.18s; position:relative; height:100%;
}
a.card:hover{border-color:var(--accent); box-shadow:0 10px 30px rgba(20,30,50,.08);
  transform:translateY(-2px); text-decoration:none}
.card-thumb{
  width:100%; aspect-ratio:16/9; object-fit:cover; object-position:center top;
  border:1px solid var(--line); border-radius:9px; background:var(--bg-soft);
  margin-bottom:15px; display:block;
}
a.card:hover .card-thumb{border-color:#d3ddea}
.cards.three .card-thumb{aspect-ratio:16/10; margin-bottom:11px; border-radius:7px}
.card .toptag{display:flex; justify-content:space-between; align-items:center; gap:10px; margin-bottom:10px}
.card .venue{font-size:12px; font-weight:700; letter-spacing:.04em; text-transform:uppercase; color:var(--accent)}
.card h3{margin:0 0 8px; font-size:17.5px; line-height:1.35; color:var(--ink); letter-spacing:-.01em}
.card .desc{font-size:14px; color:var(--ink-soft); margin:0 0 14px; flex:1}
.card .metaline{font-size:13px; color:var(--muted); margin:0 0 12px}
.card .metaline b{color:var(--ink-soft); font-weight:600}
.card .tags{display:flex; flex-wrap:wrap; gap:6px}
.card .arrow{color:var(--accent); font-weight:600; font-size:13.5px; margin-top:14px}

/* status badges */
.status{font-size:11.5px; font-weight:700; padding:3px 9px; border-radius:999px; white-space:nowrap}
.status.accept{background:#e8f5ee; color:var(--ok)}
.status.review{background:#efecf8; color:var(--review)}
.status.reject{background:#f7ecec; color:var(--bad)}
.status.thesis{background:#eaf0f7; color:var(--accent-ink)}

/* ---- Simple list rows (education, experience, prize) ---- */
.rows{display:flex; flex-direction:column; gap:2px}
.row{padding:16px 0; border-bottom:1px solid var(--line); display:grid; grid-template-columns:150px 1fr; gap:18px}
.row:last-child{border-bottom:0}
.row .when{color:var(--muted); font-size:13.5px; font-weight:600; padding-top:1px}
.row .what{font-size:15px}
.row .what b{font-weight:700}
.row .what .sub{color:var(--ink-soft); font-size:14px; display:block; margin-top:3px}
.row .what.dim{color:var(--muted); font-weight:500}
@media(max-width:680px){ .row{grid-template-columns:1fr; gap:4px} }

.prize{padding:18px 0; border-bottom:1px solid var(--line)}
.prize:last-child{border-bottom:0}
.prize .ptitle{font-weight:700; font-size:15.5px}
.prize .pmeta{color:var(--muted); font-size:13px; font-weight:600; margin:3px 0}
.prize .pdesc{color:var(--ink-soft); font-size:14px; margin-top:4px}

/* ---- Mini project grid ---- */
.mini{display:grid; grid-template-columns:repeat(3,1fr); gap:12px}
@media(max-width:680px){ .mini{grid-template-columns:1fr 1fr} }
.minicard{border:1px solid var(--line); border-radius:11px; padding:14px 16px; background:var(--bg-soft)}
.minicard h4{margin:0 0 4px; font-size:14px; line-height:1.35}
.minicard .m{font-size:12px; color:var(--muted)}
.minicard .p{font-size:12.5px; color:var(--accent-ink); font-weight:600; margin-top:4px}

/* ---- Skills ---- */
.skills{display:grid; grid-template-columns:repeat(2,1fr); gap:14px}
@media(max-width:680px){ .skills{grid-template-columns:1fr} }
.skill{display:grid; grid-template-columns:110px 1fr; gap:14px; padding:12px 0; border-bottom:1px solid var(--line); align-items:start}
.skill .sname{font-weight:700; font-size:14.5px}
.skill .sname .lvl{display:block; font-size:12px; color:var(--accent); font-weight:600; margin-top:2px}
.skill .sctx{font-size:13.5px; color:var(--ink-soft)}

/* ---- Contact ---- */
.contact-grid{display:flex; flex-wrap:wrap; gap:12px}
.contact-grid a{display:inline-flex; align-items:center; gap:8px; border:1px solid var(--line);
  border-radius:999px; padding:10px 18px; color:var(--ink); font-weight:600; font-size:14px}
.contact-grid a:hover{border-color:var(--accent); color:var(--accent); text-decoration:none}

/* ---- Footer ---- */
footer{border-top:1px solid var(--line); padding:34px 0; color:var(--muted); font-size:13px; text-align:center}

/* ===================================================== */
/* ============  DETAIL PAGE (projects/*.html)  ========= */
/* ===================================================== */
.detail-hero{border-bottom:1px solid var(--line); padding:48px 0 30px}
.backlink{font-size:13.5px; font-weight:600; color:var(--ink-soft)}
.backlink:hover{color:var(--accent); text-decoration:none}
.detail-hero .venue{font-size:12.5px; font-weight:700; letter-spacing:.06em; text-transform:uppercase; color:var(--accent); margin-top:18px}
.detail-hero h1{font-family:var(--serif); font-size:32px; line-height:1.2; margin:.25em 0 .35em; letter-spacing:-.01em}
.detail-hero .metachips{display:flex; flex-wrap:wrap; gap:8px; margin-top:8px}

.article{padding:8px 0 60px}
.article .container{max-width:820px}
.article h1{font-family:var(--serif); font-size:26px; margin:1.4em 0 .5em}
.article h2{font-family:var(--serif); font-size:23px; margin:1.5em 0 .5em; padding-top:.2em}
.article h3{font-size:19px; margin:1.5em 0 .5em; color:var(--ink)}
.article h4{font-size:16px; margin:1.3em 0 .4em; color:var(--accent-ink)}
.article h5{font-size:14px; margin:1.2em 0 .3em; color:var(--ink-soft); text-transform:uppercase; letter-spacing:.04em}
.article p{margin:.7em 0}
.article ul,.article ol{margin:.6em 0; padding-left:1.4em}
.article li{margin:.3em 0}
.article img{display:block; margin:22px auto; border:1px solid var(--line); border-radius:10px; box-shadow:0 4px 18px rgba(20,30,50,.06)}
.article hr{border:0; border-top:1px solid var(--line); margin:2em 0}
.article a{color:var(--accent-ink)}
.article code{background:var(--bg-soft); border:1px solid var(--line); border-radius:5px; padding:1px 6px; font-size:.88em;
  font-family:"SF Mono","Cascadia Code",Consolas,monospace}
.article pre{background:#1e2430; color:#e6ebf2; border-radius:10px; padding:16px 18px; overflow:auto; font-size:13px; line-height:1.55}
.article pre code{background:none; border:0; padding:0; color:inherit}
.article blockquote{margin:1em 0; padding:.4em 1.1em; border-left:3px solid var(--accent); color:var(--ink-soft); background:var(--bg-soft); border-radius:0 8px 8px 0}
.article table{width:100%; border-collapse:collapse; margin:18px 0; font-size:13.5px; display:block; overflow-x:auto}
.article th,.article td{border:1px solid var(--line); padding:8px 11px; text-align:left; vertical-align:top}
.article th{background:var(--bg-soft); font-weight:700}
.article .callout{background:var(--accent-soft); border:1px solid #dbe4ef; border-radius:12px; padding:6px 20px; margin:20px 0}
.article .callout table{background:transparent}
.article .callout table th{background:#e4ecf5}