/* Minimal, accessible theme for a project-oriented researcher site */
:root{
  --bg: #ffffff;
  --text: #0b0b0b;
  --muted:#6b6b6b;
  --accent:#2f6df6;
  --card:#f7f7f7;
  --border: rgba(0,0,0,.08);
  --maxw: 900px;
  --radius: 16px;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0b0b0b;
    --text:#f2f2f2;
    --muted:#b3b3b3;
    --card:#171717;
    --accent:#7aa2ff;
    --border: rgba(255,255,255,.16);
  }
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:var(--maxw);margin:0 auto;padding:24px}
nav{
  position:sticky;top:0;background:var(--bg);backdrop-filter:saturate(1.2) blur(10px);
  border-bottom:1px solid var(--border);
  z-index:10;
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 24px;max-width:var(--maxw);margin:0 auto}
.brand{font-weight:700;letter-spacing:.2px}
nav ul{list-style:none;display:flex;gap:16px;margin:0;padding:0}
nav a{padding:8px 10px;border-radius:10px}
nav a.active, nav a:focus{background:var(--card);outline:none}
header.hero{padding:56px 24px 8px}
.hero .title{font-size:clamp(28px, 4vw, 40px); margin:0 0 8px 0; line-height:1.15}
.hero .tagline{color:var(--muted);margin:0 0 8px 0}
.hero .meta{color:var(--muted);font-size:0.95rem;margin-top:4px}
.card{background:var(--card);border-radius:var(--radius);padding:16px 18px;border:1px solid var(--border)}
.grid{display:grid;grid-template-columns:1fr;gap:16px}
@media (min-width: 760px){ .grid{grid-template-columns:1fr 1fr} }
.section{margin:28px 0}
.section h2{margin:0 0 10px 0;font-size:1.25rem}
.badge{display:inline-flex;align-items:center;gap:6px;padding:2px 8px;border-radius:999px;border:1px solid var(--border);background:transparent;color:var(--muted);font-size:12px}
.badge-success{background:#14a44d;color:#ffffff;border-color:#14a44d}
.
/* Subtle emphasis block */
.emphasis{background:var(--card);border:1px solid var(--border);padding:8px 12px;border-radius:10px;color:var(--muted)}
/* Language toggle */
.lang-zh{display:none}
html[data-lang="zh"] .lang-zh{display:initial}
html[data-lang="zh"] .lang-en{display:none}
footer{padding:28px 24px;color:var(--muted);text-align:center}
.btn{display:inline-block;padding:10px 14px;border-radius:12px;background:var(--text);color:var(--bg);border:1px solid var(--border)}
.btn:hover{text-decoration:none;filter:brightness(1.05)}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.small{font-size:.95rem;color:var(--muted)}
hr.sep{border:0;height:1px;background:var(--border);margin:18px 0}
ul.clean{list-style:none;margin:0;padding:0}
ul.clean li{padding:6px 0}
blockquote{margin:0;padding:0 12px;border-left:3px solid var(--accent);color:var(--muted)}
kbd{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas, "Liberation Mono","Courier New",monospace;font-size:.95em;padding:2px 6px;border-radius:6px;border:1px solid rgba(0,0,0,.15)}