/* ============================================================
   Augusto Sarti — personal site
   Clean academic. Paper ground, ink text, signal-amber accent.
   ============================================================ */

:root{
  --paper:#FBFAF7;
  --paper-2:#F3F0E9;
  --ink:#1A1A1F;
  --ink-soft:#4A4A52;
  --slate:#3A5A66;          /* structural teal-slate */
  --slate-soft:#6E8A93;
  --amber:#B96A2E;          /* restrained signal-amber accent */
  --amber-soft:#C67A3E;
  --rule:#E2DCD0;
  --rule-strong:#CFC7B6;

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Times New Roman", serif;
  --sans: "Helvetica Neue", Arial, "Segoe UI", system-ui, sans-serif;
  --mono: "SFMono-Regular", "JetBrains Mono", "Roboto Mono", Menlo, Consolas, monospace;

  --maxw: 960px;
  --gap: clamp(1.2rem, 3vw, 2.4rem);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion: reduce){ html{scroll-behavior:auto} }

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--serif);
  font-size:18px;
  line-height:1.62;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

.wrap{max-width:var(--maxw); margin:0 auto; padding:0 clamp(1.1rem,4vw,2rem)}

a{color:var(--amber); text-decoration:none; border-bottom:1px solid transparent; transition:border-color .15s ease, color .15s ease}
a:hover{border-bottom-color:var(--amber)}
a:focus-visible{outline:2px solid var(--slate); outline-offset:2px; border-radius:2px}

/* ---------- Header / nav ---------- */
.site-head{
  position:sticky; top:0; z-index:20;
  background:rgba(251,250,247,.9);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--rule);
}
.site-head .wrap{
  display:flex; align-items:center; justify-content:space-between;
  min-height:64px; gap:1rem;
}
.brand{
  font-family:var(--serif); font-weight:600; font-size:1.05rem; letter-spacing:.01em;
  color:var(--ink); border:none; white-space:nowrap;
}
.brand:hover{color:var(--ink)}
.brand .role{display:block; font-family:var(--mono); font-size:.62rem; letter-spacing:.14em;
  text-transform:uppercase; color:var(--slate-soft); font-weight:400; margin-top:1px}

.nav{display:flex; gap:clamp(.9rem,2.4vw,1.8rem); align-items:center}
.nav a{
  color:var(--ink-soft); font-family:var(--sans); font-size:.82rem; letter-spacing:.03em;
  text-transform:uppercase; border:none; padding:.2rem 0;
}
.nav a:hover, .nav a[aria-current="page"]{color:var(--amber)}
.nav a[aria-current="page"]{border-bottom:1.5px solid var(--amber)}

.nav-toggle{display:none; background:none; border:1px solid var(--rule-strong);
  border-radius:6px; padding:.35rem .5rem; cursor:pointer; color:var(--ink)}

@media (max-width:720px){
  .nav-toggle{display:inline-flex}
  .nav{
    position:absolute; top:64px; left:0; right:0;
    flex-direction:column; align-items:flex-start; gap:0;
    background:var(--paper); border-bottom:1px solid var(--rule);
    padding:.4rem 0; display:none;
  }
  .nav.open{display:flex}
  .nav a{padding:.7rem clamp(1.1rem,4vw,2rem); width:100%}
  .site-head .wrap{position:relative}
}

/* ---------- Hero ---------- */
.hero{padding:clamp(2.6rem,7vw,5rem) 0 clamp(1.8rem,4vw,3rem)}
.hero-grid{display:grid; grid-template-columns:1fr; gap:var(--gap)}
@media (min-width:760px){ .hero-grid{grid-template-columns:1.35fr 1.15fr; align-items:center} }

.eyebrow{font-family:var(--mono); font-size:.72rem; letter-spacing:.2em;
  text-transform:uppercase; color:var(--slate); margin:0 0 1rem}
.hero h1{
  font-family:var(--serif); font-weight:600; line-height:1.04;
  font-size:clamp(2.3rem,6vw,3.7rem); letter-spacing:-.01em; margin:0 0 1rem;
}
.hero .lede{font-size:clamp(1.05rem,2.3vw,1.28rem); color:var(--ink-soft); max-width:34ch; margin:0 0 1.6rem}
.hero .actions{display:flex; flex-wrap:wrap; gap:.7rem}

.btn{
  display:inline-flex; align-items:center; gap:.5rem;
  font-family:var(--sans); font-size:.82rem; letter-spacing:.04em; text-transform:uppercase;
  padding:.62rem 1.1rem; border-radius:2px; border:1px solid var(--ink);
  color:var(--ink); background:transparent; cursor:pointer;
}
.btn:hover{background:var(--ink); color:var(--paper); border-color:var(--ink)}
.btn.amber{border-color:var(--amber); color:var(--amber)}
.btn.amber:hover{background:var(--amber); color:var(--paper)}

.portrait{
  position:relative; border:1px solid var(--rule-strong); background:var(--paper-2);
  padding:.5rem;
}
.portrait img{display:block; width:100%; height:auto; filter:saturate(.96) contrast(1.02)}
.portrait figcaption{font-family:var(--mono); font-size:.62rem; letter-spacing:.1em;
  color:var(--slate-soft); text-transform:uppercase; margin-top:.45rem; text-align:right}

/* calligraphic flourish signature */
.flourish{width:100%; max-width:360px; height:auto; display:block; margin:1.4rem 0 0; overflow:visible}
.flourish path{fill:var(--slate-soft); stroke:none}
.flourish .lead{fill:var(--amber)}

/* ---------- Sections ---------- */
section[id]{scroll-margin-top:80px}
.block{padding:clamp(2.2rem,5vw,3.6rem) 0; border-top:1px solid var(--rule)}
.section-label{
  font-family:var(--mono); font-size:.72rem; letter-spacing:.2em; text-transform:uppercase;
  color:var(--slate); margin:0 0 .3rem; display:flex; align-items:baseline; gap:.7rem;
}
.section-label::before{content:""; width:26px; height:1px; background:var(--amber); display:inline-block; transform:translateY(-4px)}
.block h2{font-family:var(--serif); font-weight:600; font-size:clamp(1.7rem,4vw,2.3rem);
  letter-spacing:-.01em; margin:.2rem 0 1.4rem}
.block h3{font-family:var(--serif); font-weight:600; font-size:1.15rem; margin:1.8rem 0 .5rem; color:var(--ink)}

.prose p{margin:0 0 1.05rem; max-width:66ch}
.prose p:last-child{margin-bottom:0}

/* facts strip */
.facts{display:grid; grid-template-columns:repeat(auto-fit,minmax(150px,1fr)); gap:1px;
  background:var(--rule); border:1px solid var(--rule); margin:1.8rem 0 0}
.facts .fact{background:var(--paper); padding:1rem 1.1rem}
.facts .num{font-family:var(--serif); font-weight:600; font-size:1.6rem; color:var(--slate); line-height:1}
.facts .cap{font-family:var(--mono); font-size:.64rem; letter-spacing:.1em; text-transform:uppercase;
  color:var(--ink-soft); margin-top:.4rem}

/* research cards */
.research-grid{display:grid; grid-template-columns:1fr; gap:1.6rem; margin-top:.5rem}
@media (min-width:680px){ .research-grid{grid-template-columns:1fr 1fr} }
.rcard{border-top:2px solid var(--slate); padding-top:1rem}
.rcard h3{margin:0 0 .4rem; font-size:1.12rem}
.rcard p{margin:0; color:var(--ink-soft); font-size:.98rem}
.rcard .tag{font-family:var(--mono); font-size:.62rem; letter-spacing:.12em; text-transform:uppercase;
  color:var(--amber); display:block; margin-bottom:.35rem}

/* news timeline */
.news{list-style:none; margin:.5rem 0 0; padding:0}
.news li{display:grid; grid-template-columns:auto 1fr; gap:1.1rem; padding:1rem 0; border-bottom:1px solid var(--rule)}
.news li:last-child{border-bottom:none}
.news .date{font-family:var(--mono); font-size:.72rem; letter-spacing:.06em; color:var(--slate);
  white-space:nowrap; padding-top:.15rem}
.news .what{margin:0; color:var(--ink); font-size:1rem}

/* ---------- Publications ---------- */
.pub-controls{position:sticky; top:64px; z-index:10; background:var(--paper);
  padding:1rem 0; border-bottom:1px solid var(--rule); margin-bottom:1.4rem}
.filters{display:flex; flex-wrap:wrap; gap:.45rem; align-items:center}
.chip{
  font-family:var(--sans); font-size:.76rem; letter-spacing:.02em;
  padding:.34rem .7rem; border:1px solid var(--rule-strong); border-radius:2px;
  background:var(--paper); color:var(--ink-soft); cursor:pointer; transition:all .12s ease;
}
.chip:hover{border-color:var(--slate); color:var(--ink)}
.chip[aria-pressed="true"]{background:var(--slate); border-color:var(--slate); color:#fff}
.chip .c{font-family:var(--mono); font-size:.68rem; opacity:.75; margin-left:.35rem}
.pub-count{font-family:var(--mono); font-size:.72rem; color:var(--slate-soft); margin-left:auto; letter-spacing:.05em}

.searchbox{margin-top:.7rem; width:100%; position:relative}
.searchbox input{
  width:100%; font-family:var(--serif); font-size:.95rem; color:var(--ink);
  padding:.55rem .8rem; border:1px solid var(--rule-strong); border-radius:2px; background:var(--paper);
}
.searchbox input:focus{outline:none; border-color:var(--slate)}

.year-group{margin:0 0 1.6rem}
.year-head{font-family:var(--mono); font-size:.8rem; letter-spacing:.14em; color:var(--amber);
  border-bottom:1px solid var(--rule); padding-bottom:.35rem; margin:1.6rem 0 .8rem;
  position:sticky; top:130px; background:var(--paper)}
.sec-head{font-family:var(--serif); font-weight:600; font-size:1.25rem; color:var(--slate);
  margin:2rem 0 .4rem}

ol.pubs{list-style:none; margin:0; padding:0; counter-reset:pub}
ol.pubs li{
  position:relative; padding:.7rem 0 .7rem 2.6rem; border-bottom:1px solid var(--rule);
  font-size:.96rem; line-height:1.5; color:var(--ink);
}
ol.pubs li::before{
  counter-increment:pub; content:counter(pub);
  position:absolute; left:0; top:.72rem;
  font-family:var(--mono); font-size:.72rem; color:var(--slate-soft); width:2rem; text-align:right;
}
ol.pubs li .doi{display:inline-block; font-family:var(--mono); font-size:.72rem; margin-top:.15rem}
.pub-empty{color:var(--slate-soft); font-style:italic; padding:2rem 0}

/* ---------- Contact ---------- */
.contact-grid{display:grid; grid-template-columns:1fr; gap:1.2rem}
@media (min-width:640px){ .contact-grid{grid-template-columns:1fr 1fr} }
.contact-item .k{font-family:var(--mono); font-size:.66rem; letter-spacing:.12em; text-transform:uppercase;
  color:var(--slate); margin:0 0 .2rem}
.contact-item .v{margin:0; font-size:1.02rem}

/* ---------- Footer ---------- */
.site-foot{border-top:1px solid var(--rule); padding:2rem 0; margin-top:2rem;
  font-family:var(--mono); font-size:.72rem; letter-spacing:.05em; color:var(--slate-soft)}
.site-foot .wrap{display:flex; justify-content:space-between; flex-wrap:wrap; gap:.6rem}
.site-foot a{color:var(--slate-soft); border:none}
.site-foot a:hover{color:var(--amber)}

/* reveal on scroll */
.reveal{opacity:0; transform:translateY(14px); transition:opacity .6s ease, transform .6s ease}
.reveal.in{opacity:1; transform:none}
@media (prefers-reduced-motion: reduce){ .reveal{opacity:1; transform:none; transition:none} }