/* ============================================================
   Mahsa Sadeghi — personal site
   Clean academic · Source Serif headings + Inter body
   ============================================================ */

:root{
  --bg:#fbfaf7;
  --surface:#ffffff;
  --ink:#16202e;
  --ink-soft:#2b3647;
  --muted:#5c6675;
  --faint:#8a93a1;
  --accent:#1c3c63;        /* deep navy */
  --accent-soft:#27548a;
  --gold:#b0883e;          /* subtle scholarly gold */
  --line:#e8e3d9;
  --line-strong:#d9d3c6;
  --shadow-sm:0 1px 2px rgba(22,32,46,.04),0 2px 8px rgba(22,32,46,.05);
  --shadow-md:0 10px 30px rgba(22,32,46,.08),0 2px 8px rgba(22,32,46,.05);
  --radius:14px;
  --radius-sm:9px;
  --maxw:1140px;
  --serif:"Source Serif 4",Georgia,"Times New Roman",serif;
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  color:var(--ink-soft);
  background:var(--bg);
  line-height:1.7;
  font-size:17px;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:var(--accent-soft);text-decoration:none;transition:color .18s ease}
a:hover{color:var(--accent)}

h1,h2,h3,h4,h5{font-family:var(--serif);color:var(--ink);line-height:1.2;font-weight:600;letter-spacing:-.01em}
h1{font-size:clamp(2.1rem,5vw,3.3rem)}
h2{font-size:clamp(1.5rem,3vw,2.1rem)}
h3{font-size:1.3rem}
p{margin:0 0 1.05rem}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
.narrow{max-width:760px}

/* ---------- Header / nav ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(251,250,247,.82);
  backdrop-filter:saturate(160%) blur(14px);
  -webkit-backdrop-filter:saturate(160%) blur(14px);
  border-bottom:1px solid transparent;
  transition:border-color .25s ease,box-shadow .25s ease,background .25s ease;
}
.site-header.scrolled{border-bottom-color:var(--line);box-shadow:0 1px 0 rgba(22,32,46,.02)}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{font-family:var(--serif);font-weight:600;font-size:1.22rem;color:var(--ink);letter-spacing:-.01em;white-space:nowrap}
.brand span{color:var(--gold)}
.nav-links{display:flex;align-items:center;gap:4px;list-style:none}
.nav-links a{
  display:block;color:var(--ink-soft);font-size:.95rem;font-weight:500;
  padding:9px 14px;border-radius:8px;position:relative;
  transition:background .18s ease,color .18s ease;
}
.nav-links a:hover{background:rgba(28,60,99,.07);color:var(--accent)}
.nav-links a.active{color:var(--accent)}
.nav-links a.active::after{
  content:"";position:absolute;left:14px;right:14px;bottom:3px;height:2px;
  background:var(--gold);border-radius:2px;
}

/* dropdown */
.has-drop{position:relative}
.drop-toggle{display:flex;align-items:center;gap:5px;cursor:pointer}
.drop-toggle .chev{width:9px;height:9px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg) translateY(-2px);transition:transform .2s ease;opacity:.6}
.has-drop:hover .chev,.has-drop:focus-within .chev{transform:rotate(45deg) translateY(0)}
.drop-menu{
  position:absolute;top:calc(100% + 6px);left:0;min-width:188px;
  background:var(--surface);border:1px solid var(--line);border-radius:12px;
  box-shadow:var(--shadow-md);padding:8px;list-style:none;
  opacity:0;visibility:hidden;transform:translateY(6px);
  transition:opacity .18s ease,transform .18s ease,visibility .18s;
}
.has-drop:hover .drop-menu,.has-drop:focus-within .drop-menu,.drop-menu.open{opacity:1;visibility:visible;transform:translateY(0)}
.drop-menu a{padding:9px 12px;border-radius:7px;font-weight:500}

.nav-toggle{display:none;background:none;border:0;cursor:pointer;width:42px;height:42px;border-radius:9px}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:"";display:block;width:22px;height:2px;background:var(--ink);border-radius:2px;position:relative;margin:0 auto;transition:.25s ease;
}
.nav-toggle span::before{position:absolute;top:-7px}
.nav-toggle span::after{position:absolute;top:7px}
.nav-toggle.open span{background:transparent}
.nav-toggle.open span::before{top:0;transform:rotate(45deg)}
.nav-toggle.open span::after{top:0;transform:rotate(-45deg)}

/* ---------- Hero ---------- */
.hero{position:relative;min-height:clamp(320px,46vh,460px);display:flex;align-items:center;justify-content:center;text-align:center;overflow:hidden;background:#0f1622}
.hero .hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(12,20,34,.55),rgba(12,20,34,.68))}
.hero-inner{position:relative;z-index:2;color:#fff;padding:90px 28px}
.hero-inner h1{color:#fff;text-shadow:0 2px 30px rgba(0,0,0,.25)}
.hero-eyebrow{display:inline-block;font-family:var(--sans);font-size:.8rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:#e9d9b8;margin-bottom:14px}
.hero-inner p{color:rgba(255,255,255,.9);max-width:620px;margin:14px auto 0;font-size:1.08rem}

/* ---------- Sections ---------- */
.section{padding:72px 0}
.section.tight{padding:52px 0}
.section-head{margin-bottom:34px}
.section-head .kicker{font-size:.8rem;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);display:block;margin-bottom:8px}
.lead{font-size:1.18rem;color:var(--ink-soft)}
.divider{height:1px;background:var(--line);border:0;margin:0}

/* ---------- About ---------- */
.about-grid{display:grid;grid-template-columns:260px 1fr;gap:54px;align-items:start}
.profile-card{text-align:center;position:sticky;top:100px}
.profile-photo{width:210px;height:210px;border-radius:50%;object-fit:cover;margin:0 auto 20px;box-shadow:0 8px 30px rgba(22,32,46,.16);border:5px solid #fff}
.profile-name{font-family:var(--serif);font-size:1.45rem;color:var(--ink);margin-bottom:4px}
.profile-role{font-size:.92rem;color:var(--muted)}
.about-body p{font-size:1.06rem}
.about-body em{color:var(--accent);font-style:italic}

/* ---------- Publications ---------- */
.pub-list{display:flex;flex-direction:column;gap:0}
.pub{display:grid;grid-template-columns:1fr 132px;gap:28px;align-items:center;padding:26px 0;border-bottom:1px solid var(--line)}
.pub:last-child{border-bottom:0}
.pub-no-fig{grid-template-columns:1fr}
.pub-title{font-family:var(--serif);font-size:1.12rem;font-weight:600;color:var(--ink);line-height:1.35;margin-bottom:6px}
.pub-authors{font-size:.96rem;color:var(--ink-soft);margin-bottom:3px}
.pub-authors strong{color:var(--accent)}
.pub-venue{font-size:.9rem;color:var(--muted);font-style:italic}
.pub-tag{display:inline-block;font-size:.72rem;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--gold);background:rgba(176,136,62,.1);padding:2px 9px;border-radius:20px;margin-top:8px}
.pub-fig{border-radius:10px;overflow:hidden;box-shadow:var(--shadow-sm);background:#f3f1ec}
.pub-fig img{width:100%;height:118px;object-fit:cover}
.subhead{font-family:var(--serif);font-size:1.5rem;color:var(--ink);margin:46px 0 6px;display:flex;align-items:center;gap:14px}
.subhead::after{content:"";flex:1;height:1px;background:var(--line)}
.subhead:first-child{margin-top:0}

/* ---------- Teaching ---------- */
.course-grid{display:grid;grid-template-columns:1fr 360px;gap:48px;align-items:start}
.course-meta{font-size:.85rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--gold);margin-bottom:10px}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--accent);color:#fff;font-weight:500;font-size:.95rem;padding:11px 20px;border-radius:9px;margin-top:8px;transition:background .18s ease,transform .18s ease}
.btn:hover{background:var(--accent-soft);color:#fff;transform:translateY(-1px)}
.btn .arr{transition:transform .2s ease}
.btn:hover .arr{transform:translateX(3px)}
.course-photo{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-md);aspect-ratio:3/4;max-width:360px;width:100%;margin:0 auto}
.course-photo img{width:100%;height:100%;object-fit:cover;object-position:center top}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:30px}
.gallery figure{border-radius:11px;overflow:hidden;box-shadow:var(--shadow-sm);aspect-ratio:3/4;background:#f3f1ec}
.gallery img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.gallery figure:hover img{transform:scale(1.05)}

/* ---------- Art / repertoire ---------- */
.rep{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin-top:18px}
.rep-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px 26px;box-shadow:var(--shadow-sm)}
.rep-card h3{color:var(--accent);font-size:1.12rem;margin-bottom:12px;display:flex;align-items:center;gap:9px}
.rep-card h3::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--gold)}
.rep-card ul{list-style:none}
.rep-card li{font-size:.98rem;color:var(--ink-soft);padding:5px 0 5px 18px;position:relative;border-bottom:1px dashed var(--line)}
.rep-card li:last-child{border-bottom:0}
.rep-card li::before{content:"\266A";position:absolute;left:0;color:var(--faint);font-size:.85rem}

/* ---------- Hobbies hub ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.hcard{position:relative;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);background:#0f1622;min-height:280px;display:flex;align-items:flex-end;transition:transform .3s ease,box-shadow .3s ease}
.hcard:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.hcard .hc-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.hcard:hover .hc-bg{transform:scale(1.06)}
.hcard::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(12,20,34,.05) 30%,rgba(12,20,34,.78))}
.hc-body{position:relative;z-index:2;padding:24px;color:#fff}
.hc-body h3{color:#fff;font-size:1.45rem;margin-bottom:4px}
.hc-body span{font-size:.88rem;color:rgba(255,255,255,.82)}
.hc-soon{font-size:.72rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:#e9d9b8;background:rgba(255,255,255,.14);padding:3px 10px;border-radius:20px;display:inline-block}

/* ---------- Coming Soon ---------- */
.coming{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:110px 28px;min-height:48vh}
.coming .badge{font-size:.8rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--gold);margin-bottom:18px}
.coming h2{font-size:clamp(2.2rem,6vw,3.4rem);color:var(--ink);margin-bottom:14px}
.coming p{color:var(--muted);max-width:480px;font-size:1.08rem}
.coming .dots{display:flex;gap:8px;margin-top:30px}
.coming .dots i{width:9px;height:9px;border-radius:50%;background:var(--line-strong);animation:pulse 1.4s ease-in-out infinite}
.coming .dots i:nth-child(2){animation-delay:.2s}
.coming .dots i:nth-child(3){animation-delay:.4s}
@keyframes pulse{0%,100%{opacity:.35;transform:scale(.85)}50%{opacity:1;transform:scale(1);background:var(--gold)}}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--line);padding:46px 0;margin-top:20px}
.footer-inner{display:flex;flex-wrap:wrap;gap:18px;align-items:center;justify-content:space-between}
.footer-brand{font-family:var(--serif);font-size:1.1rem;color:var(--ink)}
.footer-links{display:flex;gap:20px;list-style:none;flex-wrap:wrap}
.footer-links a{color:var(--muted);font-size:.92rem}
.footer-links a:hover{color:var(--accent)}
.copy{font-size:.86rem;color:var(--faint);width:100%;margin-top:6px}

/* ---------- Smooth image loading (blur-up) ---------- */
.lazy{filter:blur(14px);transform:scale(1.03);transition:filter .7s ease,transform .7s ease;will-change:filter,transform}
.lazy.loaded{filter:blur(0);transform:scale(1)}

/* reveal on scroll */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}

/* ---------- Responsive ---------- */
@media(max-width:900px){
  .about-grid{grid-template-columns:1fr;gap:32px}
  .profile-card{position:static}
  .course-grid{grid-template-columns:1fr;gap:30px}
  .cards{grid-template-columns:1fr 1fr}
  .rep{grid-template-columns:1fr}
}
@media(max-width:760px){
  body{font-size:16px}
  .nav-toggle{display:block}
  .nav-links{
    position:fixed;inset:72px 0 auto 0;flex-direction:column;align-items:stretch;gap:2px;
    background:var(--surface);border-bottom:1px solid var(--line);padding:14px 18px 22px;
    box-shadow:var(--shadow-md);
    transform:translateY(-12px);opacity:0;visibility:hidden;transition:.22s ease;
  }
  .nav-links.open{transform:none;opacity:1;visibility:visible}
  .nav-links a{padding:12px 12px;font-size:1rem;border-radius:9px}
  .nav-links a.active::after{display:none}
  .has-drop{display:block}
  .drop-menu{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;border-left:2px solid var(--line);border-radius:0;margin:2px 0 6px 14px;padding:2px 0;min-width:0;display:none}
  .drop-menu.open{display:block}
  .drop-toggle .chev{margin-left:auto}
  .gallery{grid-template-columns:repeat(2,1fr)}
  .pub{grid-template-columns:1fr}
  .pub-fig{max-width:200px}
  .section{padding:54px 0}
}
@media(max-width:520px){
  .cards{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){
  *{scroll-behavior:auto!important}
  .reveal,.lazy{transition:none}
  .lazy{filter:none;transform:none}
}