:root{
  --bg1:#0B1E3D; --bg2:#132E58; --bg3:#1E3A8A;
  --surface:#fff; --text:#0B1220; --muted:#556174; --accent:#1D4ED8;
  --radius:20px; --hair:rgba(15,23,42,.1); --shadow:0 16px 42px rgba(0,0,0,.2);
  --max:1040px; --font:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:#E5E7EB;background:linear-gradient(-45deg,var(--bg1),var(--bg2),var(--bg3),#0B1224);background-size:420% 420%;animation:mv 20s ease infinite}
@keyframes mv{0%{background-position:0 50%}50%{background-position:100% 50%}100%{background-position:0 50%}}
.page{padding:18px 2vw 70px;position:relative;overflow:hidden}
.chart-line,.chart{position:absolute;inset:-10px 0 auto 0;height:46vh;opacity:.1;pointer-events:none}
.chart-line svg,.chart svg{width:100%;height:100%}
.chart-path,.path{fill:none;stroke:#A7C7FF;stroke-width:2.5;stroke-dasharray:1200;stroke-dashoffset:1200;animation:dr 10s ease-in-out infinite alternate}
@keyframes dr{to{stroke-dashoffset:0}}
.topbar,.card,footer,.top{width:min(var(--max),95%);margin:0 auto}
.topbar{display:flex;justify-content:space-between;gap:16px;position:relative;z-index:2;margin-bottom:14px}
.toplinks{display:flex;gap:20px;flex-wrap:wrap;font-size:13px}
.toplinks a,.top a{color:#CBD5E1;text-decoration:none}
.toplinks a:hover,.top a:hover{color:#fff}
.langToggle{display:inline-flex;align-items:center;border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.12);border-radius:999px}
.langToggle a{padding:6px 12px;color:#E5E7EB;text-decoration:none;font-weight:800;font-size:12px;border-radius:999px}
.langToggle .active{background:rgba(255,255,255,.2);color:#fff}
.sep{width:1px;height:18px;background:rgba(255,255,255,.25)}
.card{background:rgba(255,255,255,.98);color:var(--text);border:1px solid rgba(15,23,42,.06);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px;position:relative;z-index:1}
.hero{display:grid;grid-template-columns:300px 1fr;gap:20px;align-items:center;padding:22px 24px}
.portrait{width:220px;height:220px;border-radius:999px;overflow:hidden;margin:0 auto;border:8px solid #fff;box-shadow:0 10px 24px rgba(15,23,42,.1);background:#E2E8F0}
.portrait img{width:100%;height:100%;object-fit:cover;display:block}
h1{margin:0 0 10px;font-size:40px;line-height:1.06;letter-spacing:-.6px}
.name{color:var(--accent)}
.lede{margin:0;color:var(--muted);line-height:1.45}
.nav{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.btn{padding:9px 12px;border-radius:12px;text-decoration:none;font-weight:800;display:inline-flex;align-items:center;justify-content:center}
.primary{background:var(--accent);color:#fff}
.ghost{border:1px solid var(--hair);color:var(--text)}
.section{margin-top:16px;opacity:0;transform:translateY(16px);transition:.45s}
.section.show{opacity:1;transform:none}
.proj-grid,.grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.proj-card,.post{border:1px solid var(--hair);border-radius:16px;padding:16px;background:#fff}
.tag{display:inline-block;padding:5px 10px;border-radius:999px;border:1px solid var(--hair);font-size:12px;font-weight:800;color:#334155;background:rgba(15,23,42,.03)}
.contact-grid{display:grid;grid-template-columns:1.4fr .6fr;gap:24px;align-items:center}
.field{width:100%;padding:12px;border:1px solid #E5E7EB;border-radius:12px;margin-bottom:10px;font-family:inherit}
footer{text-align:center;margin-top:16px;font-size:12px;color:#CBD5E1}
.top{margin-bottom:14px;position:relative;z-index:2}
.chip{display:inline-flex;gap:8px;padding:8px 12px;border-radius:999px;background:rgba(37,99,235,.08);border:1px solid rgba(29,78,216,.22);color:#1e3a8a;font-size:12px;font-weight:800}
.ticker{margin-top:12px;padding:10px 12px;border-radius:12px;border:1px solid rgba(29,78,216,.18);background:linear-gradient(90deg,rgba(29,78,216,.08),rgba(37,99,235,.04));color:#1e3a8a;font-size:12px;font-weight:800;display:flex;gap:12px;flex-wrap:wrap}
.toc{border:1px solid var(--hair);border-radius:14px;padding:14px;background:#fff;color:var(--text);text-decoration:none;transition:.2s}
.toc.active{border-color:rgba(29,78,216,.45);box-shadow:0 0 0 3px rgba(29,78,216,.12);background:rgba(29,78,216,.03)}
.tochead{display:flex;justify-content:space-between;gap:8px}
.meta{font-size:13px;color:var(--muted);white-space:nowrap}
.excerpt{margin-top:4px;color:#334155;font-size:14px;line-height:1.55}
.post{scroll-margin-top:18px;padding:18px}
.postmeta{font-size:13px;color:var(--muted);margin:-2px 0 10px}
.tags{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.key{margin:12px 0 14px;padding:12px 14px;border-radius:14px;border:1px solid rgba(29,78,216,.16);background:rgba(29,78,216,.05)}
.key b{color:#1e3a8a}.key ul{margin:6px 0 0;padding-left:18px;color:#334155}
@media (max-width:920px){.hero,.contact-grid{grid-template-columns:1fr;text-align:center}.topbar{flex-direction:column}.nav{justify-content:center}.toplinks{justify-content:center}.card{padding:20px}}
@media (max-width:860px){.proj-grid,.grid{grid-template-columns:1fr}}

.back-to-top{
  position:fixed;
  right:20px;
  bottom:20px;
  width:42px;
  height:42px;
  border-radius:999px;
  border:1px solid rgba(255,255,255,.22);
  background:rgba(11,18,36,.78);
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:20px;
  line-height:1;
  text-decoration:none;
  box-shadow:0 8px 20px rgba(0,0,0,.28);
  backdrop-filter: blur(6px);
  opacity:0;
  pointer-events:none;
  transform:translateY(8px);
  transition:opacity .2s ease, transform .2s ease, background .2s ease;
  z-index:999;
}

.back-to-top:hover{background:rgba(29,78,216,.95)}

.back-to-top.show{
  opacity:1;
  pointer-events:auto;
  transform:translateY(0);
}