/* ===== cross-page view transitions (smooth fades between pages) ===== */
@view-transition { navigation: auto; }

:root {
  --bg:#0a0b10; --bg-2:#0e1018;
  --surface:rgba(255,255,255,0.03); --surface-2:rgba(255,255,255,0.05);
  --border:rgba(255,255,255,0.08); --border-hi:rgba(120,200,255,0.35);
  --text:#e9ecf4; --muted:#8b93a7; --faint:#5b6275;
  --accent:#38e1c4; --accent-2:#6d7bff; --accent-3:#b06dff;
  --code-bg:#06070c;
  --glow:0 0 0 1px var(--border-hi),0 8px 40px -8px rgba(80,160,255,0.25);
  --max:1040px; --read:720px;
  --display:"Space Grotesk",system-ui,sans-serif; --sans:"Inter",system-ui,sans-serif; --mono:"JetBrains Mono",ui-monospace,monospace;
}
:root[data-theme="light"] {
  --bg:#f7f8fb; --bg-2:#eef1f6;
  --surface:rgba(20,28,48,0.03); --surface-2:rgba(20,28,48,0.05);
  --border:rgba(20,28,48,0.10); --border-hi:rgba(50,120,210,0.4);
  --text:#161a23; --muted:#5a6273; --faint:#8a91a1;
  --accent:#0c9c84; --accent-2:#4453e6; --accent-3:#8a3ce0;
  --code-bg:#0e1018;
}

* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
  margin:0;
  background:
    radial-gradient(900px 500px at 80% -10%, color-mix(in srgb, var(--accent-2) 18%, transparent), transparent 60%),
    radial-gradient(800px 500px at 0% 0%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 55%),
    var(--bg);
  color:var(--text); font-family:var(--sans); line-height:1.65; -webkit-font-smoothing:antialiased; overflow-x:hidden;
}
:root[data-theme="light"] body { background:
    radial-gradient(900px 500px at 80% -10%, rgba(68,83,230,0.10), transparent 60%),
    radial-gradient(800px 500px at 0% 0%, rgba(12,156,132,0.10), transparent 55%),
    var(--bg); }
::selection { background:color-mix(in srgb, var(--accent) 30%, transparent); }
.wrap { max-width:var(--max); margin:0 auto; padding:0 1.5rem; }

.progress-bar { position:fixed; top:0; left:0; height:3px; width:0%; z-index:60;
  background:linear-gradient(90deg,var(--accent),var(--accent-2),var(--accent-3));
  transition:width .08s linear; box-shadow:0 0 12px color-mix(in srgb,var(--accent) 60%,transparent); }

/* header */
.site-header { position:sticky; top:0; z-index:50; background:color-mix(in srgb,var(--bg) 70%,transparent);
  backdrop-filter:blur(14px) saturate(160%); border-bottom:1px solid var(--border); }
.header-inner { display:flex; align-items:center; gap:1.5rem; padding:.85rem 1.5rem; }
.brand { font-family:var(--display); font-weight:700; font-size:1.05rem; text-decoration:none; color:var(--text);
  margin-right:auto; display:flex; align-items:center; gap:.55rem; letter-spacing:.2px; }
.brand-dot { width:9px; height:9px; border-radius:50%; background:var(--accent);
  box-shadow:0 0 12px var(--accent); animation:pulse 2.4s ease-in-out infinite; }
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.5;transform:scale(.8)} }
.nav { display:flex; gap:1.4rem; }
.nav a { text-decoration:none; color:var(--muted); font-size:.9rem; font-weight:500; position:relative; padding:.2rem 0; transition:color .2s; }
.nav a::after { content:""; position:absolute; left:0; bottom:-3px; height:2px; width:0;
  background:linear-gradient(90deg,var(--accent),var(--accent-2)); transition:width .25s ease; }
.nav a:hover { color:var(--text); } .nav a.active { color:var(--text); } .nav a.active::after { width:100%; }
.theme-toggle { background:var(--surface); border:1px solid var(--border); border-radius:9px; cursor:pointer;
  font-size:.95rem; padding:.32rem .5rem; line-height:1; color:var(--text); transition:border-color .2s, transform .15s; }
.theme-toggle:hover { border-color:var(--border-hi); transform:translateY(-1px); }

main { min-height:72vh; } .page { padding:3.5rem 0 5rem; }
.loading,.empty { color:var(--muted); }

/* hero */
.hero { position:relative; min-height:86vh; display:flex; align-items:center; overflow:hidden; }
#hero-canvas { position:absolute; inset:0; width:100%; height:100%; z-index:0; }
.hero-inner { position:relative; z-index:2; }
.hero-eyebrow { font-family:var(--mono); font-size:.8rem; letter-spacing:2px; text-transform:uppercase; color:var(--accent); margin-bottom:1.1rem; opacity:0; animation:rise .8s .1s ease forwards; }
.hero h1 { font-family:var(--display); font-weight:700; font-size:clamp(2.6rem,7vw,5rem); line-height:1.02; margin:0 0 1.1rem; letter-spacing:-1.5px; opacity:0; animation:rise .8s .2s ease forwards; }
.hero h1 .grad { background:linear-gradient(120deg,var(--accent),var(--accent-2) 55%,var(--accent-3)); -webkit-background-clip:text; background-clip:text; -webkit-text-fill-color:transparent; }
.hero .lead { font-size:clamp(1.05rem,2.2vw,1.3rem); color:var(--muted); max-width:560px; margin:0 0 2rem; opacity:0; animation:rise .8s .35s ease forwards; }
.hero-cta { display:flex; gap:.9rem; flex-wrap:wrap; opacity:0; animation:rise .8s .5s ease forwards; }
.btn { font-weight:600; font-size:.92rem; cursor:pointer; padding:.7rem 1.3rem; border-radius:10px; text-decoration:none; border:1px solid var(--border); transition:transform .15s, box-shadow .2s, border-color .2s; display:inline-block; }
.btn-primary { background:linear-gradient(120deg,var(--accent),var(--accent-2)); color:#04121a; border:none; }
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 10px 30px -8px color-mix(in srgb,var(--accent) 50%,transparent); }
.btn-ghost { background:var(--surface); color:var(--text); }
.btn-ghost:hover { border-color:var(--border-hi); transform:translateY(-2px); }
.scroll-hint { position:absolute; bottom:1.5rem; left:50%; transform:translateX(-50%); z-index:2; color:var(--faint); font-family:var(--mono); font-size:.72rem; letter-spacing:1px; animation:bob 2s ease-in-out infinite; }
@keyframes bob { 0%,100%{transform:translateX(-50%) translateY(0)} 50%{transform:translateX(-50%) translateY(6px)} }
@keyframes rise { from{opacity:0;transform:translateY(18px)} to{opacity:1;transform:none} }

.section-head { margin:0 0 1.6rem; }
.section-head .kicker { font-family:var(--mono); font-size:.74rem; letter-spacing:2px; text-transform:uppercase; color:var(--accent); }
.section-head h2 { font-family:var(--display); font-size:clamp(1.6rem,4vw,2.2rem); margin:.4rem 0 0; letter-spacing:-.5px; }
.section-head p { color:var(--muted); margin:.5rem 0 0; }

.about-body { font-size:1.08rem; color:var(--text); max-width:var(--read); opacity:.92; }
.about-body a { color:var(--accent); text-decoration:none; border-bottom:1px solid color-mix(in srgb,var(--accent) 30%,transparent); }
.cv-list { display:grid; gap:.8rem; margin-top:1.4rem; }
.cv-card { display:flex; justify-content:space-between; gap:1rem; align-items:baseline; padding:1.05rem 1.3rem; border:1px solid var(--border); border-radius:14px; background:var(--surface); transition:border-color .2s, transform .2s, background .2s; }
.cv-card:hover { border-color:var(--border-hi); transform:translateX(4px); background:var(--surface-2); }
.cv-card .role { font-weight:600; } .cv-card .place { color:var(--muted); font-size:.92rem; margin-top:.15rem; }
.cv-card .date { color:var(--faint); font-family:var(--mono); font-size:.78rem; white-space:nowrap; }

/* toolbar / grid */
.toolbar { display:flex; flex-wrap:wrap; gap:.8rem; align-items:center; margin:0 0 1.8rem; }
.search { flex:1 1 240px; display:flex; align-items:center; gap:.6rem; background:var(--surface); border:1px solid var(--border); border-radius:11px; padding:.6rem .9rem; transition:border-color .2s, box-shadow .2s; }
.search:focus-within { border-color:var(--border-hi); box-shadow:var(--glow); }
.search svg { flex:none; opacity:.6; }
.search input { background:none; border:none; outline:none; color:var(--text); font-family:var(--sans); font-size:.95rem; width:100%; }
.search input::placeholder { color:var(--faint); }
.chips { display:flex; flex-wrap:wrap; gap:.5rem; }
.chip { font-family:var(--mono); font-size:.76rem; padding:.4rem .8rem; border-radius:999px; cursor:pointer; background:var(--surface); border:1px solid var(--border); color:var(--muted); transition:all .18s; }
.chip:hover { color:var(--text); border-color:var(--border-hi); }
.chip.active { background:linear-gradient(120deg,color-mix(in srgb,var(--accent) 18%,transparent),color-mix(in srgb,var(--accent-2) 18%,transparent)); color:var(--text); border-color:var(--border-hi); }

.grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:1.1rem; }
.card { position:relative; display:flex; flex-direction:column; gap:.7rem; padding:1.4rem; border:1px solid var(--border); border-radius:16px; background:var(--surface); text-decoration:none; color:var(--text); overflow:hidden; transition:transform .22s, border-color .22s, box-shadow .22s; }
.card::before { content:""; position:absolute; inset:0; border-radius:16px; padding:1px; background:linear-gradient(120deg,var(--accent),var(--accent-2),var(--accent-3)); -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0); -webkit-mask-composite:xor; mask-composite:exclude; opacity:0; transition:opacity .25s; }
.card:hover { transform:translateY(-5px); box-shadow:0 18px 50px -18px rgba(80,160,255,0.45); }
.card:hover::before { opacity:1; }
.card .cat { font-family:var(--mono); font-size:.7rem; letter-spacing:1.5px; text-transform:uppercase; color:var(--accent); }
.card h3 { font-family:var(--display); font-size:1.2rem; margin:0; line-height:1.25; }
.card .excerpt { color:var(--muted); font-size:.92rem; margin:0; flex:1; }
.card .card-meta { display:flex; gap:.6rem; align-items:center; flex-wrap:wrap; margin-top:.2rem; }
.card .meta-txt { color:var(--faint); font-family:var(--mono); font-size:.74rem; }
.tag { font-family:var(--mono); font-size:.7rem; color:var(--muted); background:var(--surface-2); padding:.15rem .5rem; border-radius:6px; border:1px solid var(--border); }

/* article */
.article-wrap { display:grid; grid-template-columns:minmax(0,1fr) 220px; gap:3rem; align-items:start; }
.article { min-width:0; max-width:var(--read); }
.back-link { font-family:var(--mono); font-size:.8rem; color:var(--muted); text-decoration:none; display:inline-block; margin-bottom:1.4rem; transition:color .2s; }
.back-link:hover { color:var(--accent); }
.article h1 { font-family:var(--display); font-size:clamp(1.9rem,4.5vw,2.7rem); line-height:1.12; letter-spacing:-.8px; margin:0 0 .9rem; }
.article-meta { display:flex; gap:.7rem; align-items:center; flex-wrap:wrap; color:var(--faint); font-family:var(--mono); font-size:.78rem; margin-bottom:2.2rem; padding-bottom:1.4rem; border-bottom:1px solid var(--border); }
.article-meta .cat { color:var(--accent); }
.article-body { font-size:1.07rem; color:var(--text); opacity:.94; }
.article-body h2 { font-family:var(--display); font-size:1.5rem; margin:2.4rem 0 .8rem; letter-spacing:-.3px; scroll-margin-top:90px; opacity:1; }
.article-body h3 { font-family:var(--display); font-size:1.2rem; margin:1.8rem 0 .6rem; scroll-margin-top:90px; }
.article-body p { margin:1.05rem 0; }
.article-body a { color:var(--accent); text-decoration:none; border-bottom:1px solid color-mix(in srgb,var(--accent) 30%,transparent); }
.article-body strong { color:var(--text); font-weight:700; }
.article-body ul,.article-body ol { padding-left:1.3rem; } .article-body li { margin:.4rem 0; }
.article-body img { max-width:100%; border-radius:12px; border:1px solid var(--border); }
.article-body pre { background:var(--code-bg); border:1px solid var(--border); padding:1.1rem 1.2rem; border-radius:12px; overflow-x:auto; font-family:var(--mono); font-size:.86rem; line-height:1.6; color:#cfe6ff; }
.article-body code { font-family:var(--mono); font-size:.9em; }
.article-body :not(pre) > code { background:var(--surface-2); padding:.12rem .4rem; border-radius:6px; color:var(--accent); border:1px solid var(--border); }
.article-body blockquote { border-left:3px solid var(--accent); margin:1.4rem 0; padding:.4rem 0 .4rem 1.2rem; color:var(--muted); font-style:italic; background:linear-gradient(90deg,color-mix(in srgb,var(--accent) 6%,transparent),transparent); }
.article-body table { border-collapse:collapse; width:100%; margin:1.5rem 0; font-size:.94rem; }
.article-body th,.article-body td { border:1px solid var(--border); padding:.6rem .8rem; text-align:left; }
.article-body th { background:var(--surface-2); font-family:var(--display); }
.article-body hr { border:none; border-top:1px solid var(--border); margin:2rem 0; }

/* chart embed */
.chart-embed { position:relative; margin:1.6rem 0; padding:1.2rem; border:1px solid var(--border); border-radius:14px; background:var(--surface); }
.chart-embed canvas { max-width:100%; }

/* TOC */
.toc { position:sticky; top:90px; font-size:.85rem; }
.toc-title { font-family:var(--mono); font-size:.72rem; letter-spacing:1.5px; text-transform:uppercase; color:var(--faint); margin-bottom:.8rem; }
.toc a { display:block; color:var(--muted); text-decoration:none; padding:.28rem 0 .28rem .8rem; border-left:2px solid var(--border); transition:color .2s, border-color .2s; }
.toc a.sub { padding-left:1.6rem; font-size:.82rem; }
.toc a:hover { color:var(--text); } .toc a.active { color:var(--accent); border-color:var(--accent); }

/* scroll reveal */
.reveal { opacity:0; transform:translateY(24px); transition:opacity .6s ease, transform .6s ease; }
.reveal.in { opacity:1; transform:none; }

/* footer */
.site-footer { border-top:1px solid var(--border); margin-top:2rem; padding:2rem 0; }
.footer-inner { display:flex; justify-content:space-between; align-items:center; color:var(--faint); font-size:.85rem; font-family:var(--mono); gap:1rem; flex-wrap:wrap; }
.footer-links { display:flex; gap:1.2rem; }
.footer-links a { color:var(--muted); text-decoration:none; } .footer-links a:hover { color:var(--accent); }

@media (max-width:820px){ .article-wrap{ grid-template-columns:1fr; } .toc{ display:none; } }
@media (max-width:560px){ .nav{ gap:1rem; } .nav a{ font-size:.82rem; } .header-inner{ gap:.7rem; } .cv-card{ flex-direction:column; } .cv-card .date{ order:-1; } }
@media (prefers-reduced-motion:reduce){ *,*::before,*::after{ animation:none!important; transition:none!important; } .reveal{ opacity:1; transform:none; } }