/* Classic grey/white theme, fully responsive, no external deps */
:root{
  --bg:#f6f7f9;
  --card:#ffffff;
  --text:#0f172a;
  --muted:#475569;
  --line:#e5e7eb;
  --shadow:0 10px 30px rgba(2,6,23,.08);
  --radius:18px;
  --accent:#111827;
  --accent2:#334155;
  --chip:#f1f5f9;
  --focus: #2563eb;
}

:root[data-theme="dark"]{
  --bg:#0b1220;
  --card:#0f172a;
  --text:#e5e7eb;
  --muted:#a3b1c6;
  --line:#1f2a3a;
  --shadow:0 18px 40px rgba(0,0,0,.35);
  --accent:#e5e7eb;
  --accent2:#cbd5e1;
  --chip:#111c2e;
  --focus:#60a5fa;
}

*{box-sizing:border-box}
html,body{height:100%; overflow-x:hidden}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji","Segoe UI Emoji";
  background: radial-gradient(1200px 700px at 15% 0%, rgba(148,163,184,.22), transparent 55%),
              radial-gradient(900px 600px at 85% 10%, rgba(148,163,184,.18), transparent 55%),
              var(--bg);
  color:var(--text);
  line-height:1.55;
  overflow-x:hidden;
}
a{color:inherit; text-decoration:none}
a:hover{text-decoration:none}
img{max-width:100%; display:block}
.container{max-width:1040px; padding:18px; margin:0 auto}
.skip{
  position:absolute; left:-999px; top:auto; width:1px; height:1px; overflow:hidden
}
.skip:focus{
  left:18px; top:18px; width:auto; height:auto; padding:10px 12px;
  background:var(--card); border:1px solid var(--line); border-radius:12px;
  box-shadow:var(--shadow); z-index:9999
}

/* Header */
.topbar{
  position:sticky; top:0; z-index:50;
  backdrop-filter: blur(10px);
  background: color-mix(in oklab, var(--bg) 70%, transparent);
  border-bottom:1px solid color-mix(in oklab, var(--line) 70%, transparent);
}
.nav{
  display:flex; align-items:center; gap:14px; padding:14px 0;
}
.brand{
  display:flex; align-items:center; gap:12px; min-width:0;
}
.logo{
  width:42px; height:42px; border-radius:14px;
  background: var(--card);
  border:1px solid var(--line);
  display:grid; place-items:center;
  box-shadow: 0 6px 18px rgba(2,6,23,.08);
  font-weight:800;
  letter-spacing:.5px;
}
.brand h1{
  font-size:16px; margin:0; white-space:nowrap; overflow:hidden; text-overflow:ellipsis;
}
.brand p{margin:0; font-size:12px; color:var(--muted); white-space:nowrap; overflow:hidden; text-overflow:ellipsis}
.spacer{flex:1}
.iconbtn{
  width:44px; height:44px; border-radius:14px;
  border:1px solid var(--line);
  background:var(--card);
  display:grid; place-items:center;
  box-shadow: 0 6px 18px rgba(2,6,23,.06);
  cursor:pointer;
}
.iconbtn:focus{outline:3px solid color-mix(in oklab, var(--focus) 55%, transparent); outline-offset:2px}
.icon{width:20px; height:20px; opacity:.9}

.links{
  display:flex; gap:8px; align-items:center;
}
.pills{
  display:flex; gap:10px; align-items:center; flex-wrap:wrap;
}
.pill{
  display:inline-flex; align-items:center; gap:10px;
  padding:8px 12px;
  border-radius:999px;
  border:1px solid var(--line);
  background:var(--card);
  color:var(--text);
  box-shadow: 0 6px 18px rgba(2,6,23,.05);
  font-weight:600;
  font-size:13px;
}
.pill.active{background: color-mix(in oklab, var(--card) 75%, rgba(148,163,184,.12));}
.pill:hover{transform: translateY(-1px)}
.pill:focus{outline:3px solid color-mix(in oklab, var(--focus) 55%, transparent); outline-offset:2px}

.menu{
  display:none;
  position:absolute;
  right:18px;
  top:74px;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:16px;
  box-shadow:var(--shadow);
  padding:10px;
  width:min(320px, calc(100vw - 36px));
}
.menu.open{display:block}
.menu a{
  display:flex; align-items:center; justify-content:space-between;
  padding:12px 12px;
  border-radius:14px;
  font-weight:650;
}
.menu a:hover{background: color-mix(in oklab, var(--chip) 85%, transparent);}
.menu small{color:var(--muted); font-weight:500}

/* Main layout */
.grid{
  display:grid;
  grid-template-columns: 1.25fr .75fr;
  gap:18px;
  padding:18px 0 28px;
}
@media (max-width: 900px){
  .grid{grid-template-columns: 1fr}
}

.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.card.pad{padding:18px}
.card h2{margin:0 0 6px 0; font-size:22px}
.card p{margin:0; color:var(--muted)}
.hero{
  display:flex; gap:16px; align-items:flex-start;
}
.avatar{
  width:84px; height:84px; border-radius:999px;
  border:1px solid var(--line);
  background: linear-gradient(135deg, rgba(148,163,184,.25), rgba(148,163,184,.05));
  overflow:hidden;
  flex:0 0 auto;
  display:grid; place-items:center;
}
.avatar img{width:100%; height:100%; object-fit:cover}
.avatar span{font-weight:800; font-size:22px; letter-spacing:.5px; color:var(--accent2)}
.hero-title{min-width:0}
.hero-title h2{font-size:28px; margin:0 0 6px}
.hero-title .tagline{font-size:14px; color:var(--muted)}
.btnrow{display:flex; gap:10px; flex-wrap:wrap; margin-top:14px}
.btn{
  display:inline-flex; align-items:center; gap:10px;
  padding:12px 14px;
  border-radius:14px;
  border:1px solid var(--line);
  background:var(--card);
  box-shadow: 0 6px 18px rgba(2,6,23,.05);
  font-weight:700;
}
.btn.primary{
  background: var(--accent);
  color: var(--bg);
  border-color: color-mix(in oklab, var(--accent) 70%, var(--line));
}
.btn:hover{transform: translateY(-1px)}
.btn:focus{outline:3px solid color-mix(in oklab, var(--focus) 55%, transparent); outline-offset:2px}

/* Skills */
.section-title{
  display:flex; align-items:baseline; justify-content:space-between; gap:10px;
  margin:0 0 12px 0;
}
.section-title small{color:var(--muted)}
.skills{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:12px;
}
@media (max-width: 560px){
  .skills{grid-template-columns: 1fr}
}
.skill{
  display:flex; align-items:center; gap:12px;
  padding:12px;
  border-radius:16px;
  border:1px solid var(--line);
  background: color-mix(in oklab, var(--card) 92%, rgba(148,163,184,.10));
  cursor:pointer;
  user-select:none;
}
.skill:hover{transform: translateY(-1px)}
.skill:focus{outline:3px solid color-mix(in oklab, var(--focus) 55%, transparent); outline-offset:2px}
.ring{
  width:54px; height:54px; border-radius:999px;
  display:grid; place-items:center;
  background:
    conic-gradient(var(--accent) calc(var(--p)*1%), color-mix(in oklab, var(--line) 85%, transparent) 0);
  position:relative;
}
.ring::after{
  content:"";
  position:absolute; inset:7px;
  background:var(--card);
  border-radius:999px;
  border:1px solid color-mix(in oklab, var(--line) 75%, transparent);
}
.ring svg{width:22px; height:22px; position:relative; z-index:1; opacity:.95}
.skill b{display:block; font-size:14px}
.skill .meta{font-size:12px; color:var(--muted)}
.skill .pct{margin-left:auto; font-weight:800; color:var(--accent2)}
.skill-details{
  grid-column: 1 / -1;
  padding:12px 14px;
  border-radius:16px;
  border:1px dashed color-mix(in oklab, var(--line) 80%, transparent);
  background: color-mix(in oklab, var(--chip) 70%, transparent);
  color:var(--muted);
  display:none;
}
.skill-details.open{display:block}

/* Articles list + reader */
.list{
  display:flex; flex-direction:column; gap:10px;
}
.article{
  padding:14px;
  border:1px solid var(--line);
  border-radius:16px;
  background: color-mix(in oklab, var(--card) 94%, rgba(148,163,184,.08));
}
.article h3{margin:0 0 6px 0; font-size:16px}
.article p{margin:0; color:var(--muted); font-size:13px}
.chips{display:flex; gap:8px; flex-wrap:wrap; margin-top:10px}
.chip{
  font-size:12px; font-weight:650; color:var(--muted);
  padding:6px 10px; border-radius:999px;
  border:1px solid var(--line); background:var(--card);
}
.searchbar{display:flex; gap:10px; align-items:center; flex-wrap:wrap; margin-bottom:12px}
.searchbar input, .searchbar select{
  padding:12px 12px;
  border-radius:14px;
  border:1px solid var(--line);
  background:var(--card);
  color:var(--text);
  box-shadow: 0 6px 18px rgba(2,6,23,.04);
  font-weight:600;
}
.searchbar input{flex:1; min-width:220px}
.reader{
  display:none;
}
.reader.open{display:block}
.reader .title{font-size:26px; margin:0 0 6px}
.reader .sub{color:var(--muted); font-size:13px; margin:0 0 14px}
.reader .content{color:var(--text)}
.reader .content p{color:var(--text); margin:0 0 12px}
.reader .content h4{margin:18px 0 8px}
.reader .toprow{
  display:flex; gap:10px; align-items:center; justify-content:space-between; flex-wrap:wrap;
  margin-bottom:12px;
}

/* Contact */
.form{
  display:grid; gap:12px;
}
.field label{display:block; font-weight:750; margin:0 0 6px}
.field input, .field textarea{
  width:100%;
  padding:12px 12px;
  border-radius:14px;
  border:1px solid var(--line);
  background:var(--card);
  color:var(--text);
  box-shadow: 0 6px 18px rgba(2,6,23,.04);
}
.field textarea{min-height:120px; resize:vertical}
.notice{font-size:12px; color:var(--muted)}
.socials{display:flex; gap:10px; flex-wrap:wrap; margin-top:10px}
.sbtn{
  width:42px; height:42px; border-radius:14px;
  border:1px solid var(--line); background:var(--card);
  display:grid; place-items:center;
  box-shadow: 0 6px 18px rgba(2,6,23,.05);
}
.sbtn svg{width:20px; height:20px}
.sbtn:hover{transform: translateY(-1px)}
.sbtn:focus{outline:3px solid color-mix(in oklab, var(--focus) 55%, transparent); outline-offset:2px}

footer{
  padding:22px 0 36px;
  color:var(--muted);
  font-size:12px;
}
.footer-row{
  display:flex; align-items:center; justify-content:space-between; gap:12px; flex-wrap:wrap;
}
hr.sep{border:none; border-top:1px solid color-mix(in oklab, var(--line) 75%, transparent); margin:16px 0}

/* Mobile fixes: prevent header overflow + keep layout centered */
@media (max-width: 720px){
  .topbar{padding:10px 0}
  .pills{display:none}
  .menu{left:12px; right:12px; width:auto}
  .shell{padding:0 16px}
}