/* Base structure + the Projects|Research two-column grid and the
   "quadruple" expand interaction. Themes (theme.css) override the variables
   and may tweak structure. Loaded BEFORE theme.css. */
:root{
  --bg:#ffffff; --ink:#1c1d22; --muted:#6c7080; --line:#e7e8ee;
  --card:#ffffff; --card-2:#fafbfd; --accent:#6d5efc; --accent-2:#22d3ee;
  --radius:16px; --shadow:0 18px 40px -28px rgba(30,25,70,.45);
  --banner:linear-gradient(120deg,#c2e9fb,#a6c1ee 45%,#fbc2eb 80%,#c2f5e9);
  --font:"Inter",system-ui,-apple-system,sans-serif;
  --font-head:var(--font); --maxw:1240px; --col-gap:10px;
  --col-x-gap:44px;         /* horizontal gap between Projects & Research */
  --col-proj:#3b82f6;       /* Projects — blue */
  --col-research:#12a150;   /* Research — green */
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg); color:var(--ink); font-family:var(--font); line-height:1.6; -webkit-font-smoothing:antialiased}
a{color:inherit}
.page{max-width:var(--maxw); margin:0 auto; padding:0 28px}

/* Nav */
.nav{display:flex; justify-content:space-between; align-items:center; gap:20px; padding:22px 0; flex-wrap:wrap}
.brand{font-family:var(--font-head); font-weight:700; letter-spacing:-.01em; font-size:19px}
.nav .links{display:flex; gap:22px; flex-wrap:wrap; font-size:14px; font-weight:500}
.nav .links a{text-decoration:none; padding-bottom:3px; border-bottom:2px solid transparent; transition:border-color .2s,color .2s}
.nav .links a:hover{border-color:var(--accent); color:var(--accent)}

/* Banner */
.banner{height:140px; border-radius:var(--radius); background:var(--banner); background-size:200% 200%; animation:flow 16s ease infinite}
@keyframes flow{0%{background-position:0 50%}50%{background-position:100% 50%}100%{background-position:0 50%}}

/* Layout: sidebar + main */
.layout{display:grid; grid-template-columns:340px 1fr; gap:40px; align-items:stretch; height:100vh; box-sizing:border-box; padding:34px 0 24px}
.main{display:flex; flex-direction:column; min-height:0}
.sidebar{position:sticky; top:24px; align-self:start; display:flex; flex-direction:column; align-items:center; text-align:center; gap:18px}
.portrait{width:120px; height:120px; border-radius:50%; object-fit:cover}
.who h1{font-family:var(--font-head); font-size:22px; font-weight:700; letter-spacing:-.01em; line-height:1.2}
.who .role{font-size:13px; color:var(--muted); margin-top:4px}
.who .loc{font-size:13px; color:var(--muted)}
.contact{display:flex; flex-direction:column; align-items:center; gap:9px}
.contact-link{display:flex; align-items:center; gap:10px; text-decoration:none; color:var(--muted); font-size:14px; transition:color .2s}
.contact-link:hover{color:var(--accent)}
.contact-link .ic{display:inline-flex; width:18px; height:18px; flex:none}
.contact-link .ic svg{width:18px; height:18px; fill:currentColor}
.sidenav{display:flex; flex-direction:column; align-items:center; gap:7px; font-size:14px; padding-top:14px; border-top:1px solid var(--line); width:100%}
.sidenav a{text-decoration:none; color:var(--ink); width:max-content; padding:2px 0; border-bottom:1px solid transparent; transition:border-color .2s,color .2s}
.sidenav a:hover{border-color:var(--accent); color:var(--accent)}

/* Bio */
.section-title{font-family:var(--font-head); font-size:21px; font-weight:700; letter-spacing:.04em; text-transform:uppercase; color:var(--ink); margin:0 0 16px}
.bio{font-size:16px; max-width:none; margin:0 0 44px; text-align:left}
.bio b{font-weight:600}
.sidebar-bio{width:100%; text-align:center; border-top:1px solid var(--line); padding-top:16px}
.sidebar-bio .section-title{font-size:15px; letter-spacing:.12em; color:var(--muted); margin-bottom:10px}
.sidebar-bio .bio{font-size:15px; margin:0}
.site-footer{margin-top:24px; padding:22px 0; border-top:1px solid var(--line); color:var(--muted); font-size:13px; text-align:center}

/* Columns: single grid, projects in col 1, research in col 2 */
.columns{position:relative; display:grid; grid-template-columns:1fr 1fr; row-gap:var(--col-gap); column-gap:var(--col-x-gap); align-items:start; grid-auto-flow:row dense}
.colhead{font-family:var(--font-head); font-size:13px; font-weight:600; letter-spacing:.12em; text-transform:uppercase; color:var(--muted); padding-bottom:10px; border-bottom:2px solid var(--line); margin-bottom:2px}
.colhead.h-proj{grid-column:1; color:var(--col-proj)} .colhead.h-res{grid-column:2; color:var(--col-research)}

/* Static header (Portfolio + column titles) above the scrollable cards */
.portfolio-head{margin-bottom:14px}
.col-titles{display:grid; grid-template-columns:1fr 1fr; column-gap:var(--col-x-gap)}
.cards-scroll{flex:1; min-height:0; overflow-y:auto; overflow-x:hidden}

/* Cards */
.card{position:relative; overflow:hidden; grid-column:auto; background:var(--card); border:1px solid var(--line); border-radius:var(--radius); padding:12px 20px; cursor:pointer; transition:transform .4s cubic-bezier(.2,.7,.2,1),box-shadow .4s,border-color .4s,opacity .3s; outline:none}
.card.visited{opacity:.82}
.card::after{content:"Click to expand"; position:absolute; top:10px; right:12px; z-index:2; font-size:10px; font-weight:700; letter-spacing:.05em; text-transform:uppercase; color:#fff; background:rgba(0,0,0,.55); padding:4px 9px; border-radius:20px; opacity:0; transform:translateY(-4px); transition:opacity .2s,transform .2s; pointer-events:none}
.card:hover::after{opacity:1; transform:none}
.card.proj{grid-column:1} .card.res{grid-column:2}
.card.proj .card-tag{color:var(--col-proj)} .card.res .card-tag{color:var(--col-research)}
.detail-overlay.col-proj .card-tag{color:var(--col-proj)} .detail-overlay.col-research .card-tag{color:var(--col-research)}
.card:hover{box-shadow:var(--shadow)}
.card:focus-visible{box-shadow:0 0 0 3px var(--accent)}
.card-head{padding-right:138px}
.card-thumb{position:absolute; top:0; right:0; bottom:0; width:128px; background-size:cover; background-position:center; box-shadow:inset 1px 0 0 rgba(0,0,0,.08)}
.card-thumb .thumb-tag{position:absolute; left:50%; top:50%; transform:translate(-50%,-50%); font-size:9px; font-weight:700; letter-spacing:.1em; color:rgba(255,255,255,.92); background:rgba(0,0,0,.22); padding:2px 5px; border-radius:4px}
.card-text{min-width:0; flex:1}
.card-meta{display:flex; align-items:center; gap:10px; margin-bottom:5px}
.card-tag{display:inline-block; font-size:11px; font-weight:600; letter-spacing:.06em; text-transform:uppercase; color:var(--accent)}
.card-stars{display:inline-flex; align-items:center; gap:3px; font-size:12px; font-weight:600; color:var(--muted); font-variant-numeric:tabular-nums}
.card-meta .card-stars{margin-left:auto}
.card-stars .st{color:#f5b301; font-size:13px; line-height:1}
.card-stars .gh-ic{display:inline-flex; width:13px; height:13px; margin-left:4px}
.card-stars .gh-ic svg{width:13px; height:13px; fill:currentColor}
.card-name{font-family:var(--font-head); font-size:19px; font-weight:600; letter-spacing:-.01em}
.card-short{font-size:13px; color:var(--muted); margin-top:3px}
.is-placeholder .card-tag{color:var(--muted)}

/* Collapsed cards keep their detail hidden; details show in a floating panel. */
.card-detail{display:none}
.card.active{visibility:hidden}

/* Floating detail panel: full width (anchored at column 1), spans both columns,
   ~2 rows tall (quadruple), opens over the collapsed cards — works the same for
   either column and never reflows the grid. */
.detail-overlay{position:absolute; left:0; right:0; top:0; z-index:6; display:grid; grid-template-columns:1fr 1.1fr; gap:22px; align-items:stretch;
  background:var(--card); border:1px solid color-mix(in srgb,var(--accent) 40%,var(--line));
  border-radius:var(--radius); box-shadow:var(--shadow); padding:22px 24px; min-height:330px;
  opacity:0; transform:translateY(8px) scale(.985); transform-origin:top left;
  visibility:hidden; pointer-events:none;
  transition:opacity .32s ease, transform .36s cubic-bezier(.2,.7,.2,1)}
.detail-overlay.show{opacity:1; transform:none; visibility:visible; pointer-events:auto}
.detail-overlay.col-research{border-color:var(--col-research)}
.detail-overlay .od-head{display:flex; flex-wrap:wrap; align-items:center; gap:10px; margin-bottom:16px}
.detail-overlay .od-head .card-name{flex-basis:100%; margin:0}
.detail-overlay .od-head .card-stars{margin-left:auto}
.detail-overlay .od-year{display:inline-block; padding:2px 9px; border:1px solid var(--line); border-radius:20px; font-size:12px; font-weight:600; color:var(--muted); vertical-align:middle; font-variant-numeric:tabular-nums}
.detail-overlay .card-short{font-size:15px}
.detail-overlay .od-col{display:flex; flex-direction:column; min-width:0}
.detail-overlay .detail-body{flex:1}
.detail-overlay .od-col,.detail-overlay .detail-image{animation:detailIn .44s ease both}
.detail-image{align-self:stretch; height:100%; min-height:180px; border-radius:calc(var(--radius) - 6px); background-size:contain !important; background-repeat:no-repeat !important; background-position:center; box-shadow:inset 0 0 0 1px rgba(0,0,0,.08); display:grid; place-items:center; overflow:hidden}
.detail-image span{font-size:12px; font-weight:600; letter-spacing:.08em; text-transform:uppercase; color:rgba(255,255,255,.92); background:rgba(0,0,0,.2); padding:4px 10px; border-radius:20px}
@keyframes detailIn{from{opacity:0; transform:translateY(6px)}to{opacity:1; transform:none}}
.media{display:grid; grid-template-columns:1fr 1fr; gap:12px}
.ph{aspect-ratio:4/3; border-radius:calc(var(--radius) - 6px); display:grid; place-items:center; position:relative; overflow:hidden}
.ph span{font-size:12px; font-weight:600; letter-spacing:.08em; text-transform:uppercase; color:rgba(255,255,255,.9); background:rgba(0,0,0,.18); padding:4px 10px; border-radius:20px}
.detail-body .long{font-size:14px; color:var(--ink)}
.detail-overlay .facts{list-style:none; margin:14px 0 0; padding:0; display:flex; flex-direction:column; gap:7px}
.detail-overlay .facts li{position:relative; padding-left:20px; font-size:13px; color:var(--ink)}
.detail-overlay .facts li::before{content:"✦"; position:absolute; left:0; color:var(--accent); font-size:12px; top:1px}
.detail-overlay .links{display:flex; flex-wrap:wrap; gap:14px; align-items:center; padding-top:8px}
.detail-overlay .links a{display:inline-flex; align-items:center; gap:7px; font-size:14px; font-weight:600; color:#fff; background:var(--accent); padding:8px 14px; border-radius:10px; text-decoration:none; transition:filter .2s}
.detail-overlay .links .lk-ic{display:inline-flex; width:16px; height:16px; flex:none}
.detail-overlay .links .lk-ic svg{width:16px; height:16px; fill:currentColor}
.detail-overlay .links a:hover{filter:brightness(1.08)}

.hint{margin-top:22px; font-size:13px; color:var(--muted)}

/* Responsive */
@media(max-width:900px){
  .layout{grid-template-columns:1fr; gap:24px; height:auto; padding:24px 0 40px}
  .cards-scroll{flex:none; min-height:0; max-height:none; overflow:visible}
  .sidebar{position:static; flex-direction:row; flex-wrap:wrap; align-items:center; gap:14px 26px}
  .who{flex:1 1 200px}
  .contact{flex-direction:row; flex-wrap:wrap; gap:8px 16px; width:100%}
  .sidenav{flex-direction:row; flex-wrap:wrap; gap:14px; border-top:none; padding-top:0}
}
@media(max-width:680px){
  .columns{grid-template-columns:1fr}
  .colhead.h-proj,.colhead.h-res,.card.proj,.card.res{grid-column:auto}
  .detail-overlay{min-height:0}
  .detail-overlay{grid-template-columns:1fr}
  .page{padding:0 18px}
}