/* ============================================================
   Stefano Vertemati — Personal Site
   Concept: "Terminal Editorial"
   ============================================================ */
:root{
  --bg:#0b0f14;
  --bg-elev:#0f141c;
  --surface:#131a24;
  --surface-2:#1a2330;
  --surface-3:#202d3d;
  --border:#243042;
  --border-strong:#334155;
  --text:#e6edf3;
  --text-strong:#f1f5f9;
  --muted:#8b9bb0;
  --muted-2:#64748b;
  --accent:#4ade80;
  --accent-dim:#22c55e;
  --accent-glow:rgba(74,222,128,.18);
  --accent-2:#38bdf8;
  --amber:#fbbf24;
  --rose:#fb7185;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,sans-serif;
  --radius:12px;
  --radius-sm:8px;
  --max:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--sans);
  background:var(--bg);
  color:var(--text);
  line-height:1.65;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:var(--accent-2);text-decoration:none;transition:color .2s}
a:hover{color:var(--accent)}
strong{color:var(--text-strong);font-weight:600}
code{
  font-family:var(--mono);
  font-size:.88em;
  background:var(--surface-2);
  padding:1px 6px;
  border-radius:4px;
  border:1px solid var(--border);
  color:var(--accent);
}
.mono{font-family:var(--mono)}
.dim{color:var(--muted-2)}
.accent{color:var(--accent)}

/* Skip link */
.skip{
  position:absolute;left:-9999px;top:0;
  background:var(--accent);color:#0b0f14;padding:10px 16px;
  font-weight:700;border-radius:0 0 8px 0;z-index:1000;
  font-family:var(--mono);font-size:.85rem;
}
.skip:focus{left:0;color:#0b0f14}

/* Reading progress bar */
.progress{
  position:fixed;top:0;left:0;height:2px;width:0;
  background:linear-gradient(90deg,var(--accent),var(--accent-2));
  z-index:200;transition:width .1s linear;
  box-shadow:0 0 10px var(--accent-glow);
}

/* Background grid + radial */
body::before{
  content:"";position:fixed;inset:0;
  background-image:
    linear-gradient(rgba(74,222,128,.025) 1px,transparent 1px),
    linear-gradient(90deg,rgba(74,222,128,.025) 1px,transparent 1px);
  background-size:60px 60px;
  pointer-events:none;z-index:0;
}
body::after{
  content:"";position:fixed;top:-15%;left:-10%;
  width:55%;height:55%;
  background:radial-gradient(ellipse at center,var(--accent-glow),transparent 60%);
  pointer-events:none;z-index:0;filter:blur(70px);
}
main,.nav,.hero,.footer{position:relative;z-index:1}

/* ============ Nav ============ */
.nav{
  position:sticky;top:0;z-index:100;
  background:rgba(11,15,20,.82);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--border);
}
.nav-inner{
  max-width:var(--max);margin:0 auto;
  padding:14px 28px;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
}
.brand{
  font-family:var(--mono);
  font-size:.88rem;
  color:var(--text);
  white-space:nowrap;
  display:flex;align-items:center;
}
.brand:hover{color:var(--text)}
.brand-prompt{color:var(--accent)}
.brand-sep{color:var(--text)}
.brand-path{color:var(--accent-2)}
.brand-dollar{color:var(--text);margin:0 6px 0 4px}
.brand-name{color:var(--muted)}

.nav-links{display:flex;gap:4px;list-style:none;align-items:center}
.nav-links a{
  font-family:var(--mono);
  font-size:.84rem;
  color:var(--muted);
  padding:8px 12px;
  border-radius:6px;
  transition:all .2s;
  display:inline-block;
}
.nav-links a:hover{color:var(--accent);background:var(--surface)}
.nav-links .hash{color:var(--muted-2);margin-right:1px}
.nav-links a:hover .hash{color:var(--accent)}

.nav-toggle{
  display:none;
  background:none;border:1px solid var(--border);
  border-radius:6px;padding:8px 10px;cursor:pointer;
  flex-direction:column;gap:4px;
}
.nav-toggle span{
  display:block;width:18px;height:2px;background:var(--text);
}

/* ============ Sections ============ */
.section{padding:100px 28px 80px;position:relative;scroll-margin-top:70px}
.section-alt{background:linear-gradient(180deg,transparent,rgba(19,26,36,.55),transparent)}
.container{max-width:var(--max);margin:0 auto}
.h2{
  font-family:var(--mono);
  font-size:1.6rem;font-weight:600;
  margin-bottom:36px;color:var(--text-strong);
  letter-spacing:-.5px;
}
.h2 .hash{color:var(--accent);margin-right:8px}
.section-lead{color:var(--muted);max-width:680px;margin-bottom:36px;font-size:1.02rem}

/* ============ Hero ============ */
.hero{
  padding:100px 28px 90px;
  border-bottom:1px solid var(--border);
  overflow:hidden;
  scroll-margin-top:70px;
}
.hero-bg{
  position:absolute;inset:0;
  background:
    radial-gradient(circle at 80% 20%,rgba(56,189,248,.08),transparent 50%),
    radial-gradient(circle at 20% 80%,var(--accent-glow),transparent 50%);
  pointer-events:none;
}
.hero-grid{
  max-width:var(--max);margin:0 auto;
  display:grid;
  grid-template-columns:1.6fr 1fr;
  gap:64px;
  align-items:center;
  position:relative;
}
.hero-prompt{
  font-family:var(--mono);
  font-size:.92rem;
  color:var(--muted);
  margin-bottom:18px;
}
.cursor{
  display:inline-block;
  width:9px;height:1em;
  background:var(--accent);
  vertical-align:text-bottom;
  margin-left:3px;
  animation:blink 1.1s steps(2) infinite;
}
@keyframes blink{50%{opacity:0}}
.hero-name{
  font-size:clamp(2.2rem,5vw,3.6rem);
  font-weight:700;
  letter-spacing:-1.5px;
  line-height:1.05;
  margin-bottom:14px;
  color:var(--text-strong);
}
.hero-name .accent{
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-role{
  font-family:var(--mono);font-size:.92rem;
  margin-bottom:24px;
  display:flex;flex-wrap:wrap;gap:8px;align-items:center;
}
.role-tag{
  color:var(--accent);
  background:rgba(74,222,128,.08);
  border:1px solid rgba(74,222,128,.25);
  padding:3px 10px;border-radius:4px;
}
.role-sep{color:var(--muted-2)}
.hero-bio{
  color:var(--muted);font-size:1.05rem;
  max-width:580px;margin-bottom:28px;
}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:32px}

.btn{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:.86rem;font-weight:500;
  padding:11px 20px;
  border-radius:8px;
  border:1px solid var(--border-strong);
  background:var(--surface);color:var(--text);
  cursor:pointer;transition:all .2s;text-decoration:none;
}
.btn:hover{
  border-color:var(--accent);background:var(--surface-2);
  color:var(--accent);transform:translateY(-1px);
}
.btn-primary{background:var(--accent);border-color:var(--accent);color:#0b0f14;font-weight:600}
.btn-primary:hover{
  background:var(--accent-dim);border-color:var(--accent-dim);
  color:#0b0f14;box-shadow:0 6px 24px var(--accent-glow);
}
.btn-arrow{transition:transform .2s}
.btn-primary:hover .btn-arrow{transform:translateX(3px)}
.btn-ghost{background:transparent}
.btn-disabled{opacity:.4;cursor:not-allowed;pointer-events:none}

.hero-meta{
  display:flex;flex-wrap:wrap;gap:24px;
  font-family:var(--mono);font-size:.8rem;color:var(--muted);
  padding-top:24px;border-top:1px dashed var(--border);
}
.hero-meta .dim{color:var(--muted-2);margin-right:6px}
.status-dot{
  display:inline-block;width:8px;height:8px;border-radius:50%;
  background:var(--accent);box-shadow:0 0 8px var(--accent);
  vertical-align:middle;margin-right:5px;
  animation:pulse 2s infinite;
}
@keyframes pulse{
  0%,100%{opacity:1;transform:scale(1)}
  50%{opacity:.55;transform:scale(.85)}
}

/* ============ Terminal window component ============ */
.terminal-window{
  background:var(--surface);
  border:1px solid var(--border-strong);
  border-radius:var(--radius);
  overflow:hidden;
  box-shadow:0 20px 60px rgba(0,0,0,.4),0 0 0 1px rgba(74,222,128,.05);
}
.tw-bar{
  display:flex;align-items:center;gap:8px;
  background:var(--surface-2);
  padding:10px 14px;
  border-bottom:1px solid var(--border);
  font-family:var(--mono);font-size:.76rem;color:var(--muted);
}
.tw-dot{width:11px;height:11px;border-radius:50%;flex-shrink:0}
.tw-red{background:#ff5f57}
.tw-amber{background:#febc2e}
.tw-green{background:#28c840}
.tw-title{margin-left:8px;color:var(--muted)}

/* Hero photo terminal */
.hero-right{position:relative}
.hero-photo{width:100%;aspect-ratio:1;object-fit:cover;display:block}
.hero-right .terminal-window{
  transform:rotate(1.5deg);
  transition:transform .4s ease;
}
.hero-right .terminal-window:hover{transform:rotate(0deg) scale(1.02)}

/* ============ About ============ */
.about-grid{
  display:grid;
  grid-template-columns:auto 1fr;
  gap:48px;align-items:start;
}
.about-stats{
  display:grid;grid-template-columns:repeat(2,1fr);
  gap:14px;width:300px;flex-shrink:0;
}
.stat-card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  padding:20px 18px;
  position:relative;overflow:hidden;
  transition:all .25s;
}
.stat-card::before{
  content:"";position:absolute;top:0;left:0;
  width:3px;height:100%;background:var(--accent);
  transform:scaleY(0);transform-origin:bottom;
  transition:transform .3s;
}
.stat-card:hover::before{transform:scaleY(1)}
.stat-card:hover{border-color:var(--border-strong);background:var(--surface-2)}
.stat-num{
  font-family:var(--mono);font-size:2.2rem;font-weight:700;
  color:var(--accent);line-height:1;margin-bottom:8px;
}
.stat-sub{font-size:1.1rem;color:var(--muted)}
.stat-label{
  font-size:.76rem;color:var(--muted);
  text-transform:uppercase;letter-spacing:.5px;line-height:1.4;
}
.about-text p{color:var(--muted);font-size:1.02rem;margin-bottom:18px}
.about-text p:last-child{margin-bottom:0}
.about-pull{
  border-left:3px solid var(--accent);
  padding:14px 0 14px 20px;
  background:linear-gradient(90deg,var(--accent-glow),transparent 70%);
  margin-top:24px !important;
  font-style:italic;color:var(--text) !important;
  border-radius:0 8px 8px 0;
}

/* ============ Timeline ============ */
.timeline{position:relative;padding-left:36px}
.timeline::before{
  content:"";position:absolute;
  left:11px;top:8px;bottom:8px;width:2px;
  background:linear-gradient(180deg,var(--accent),var(--accent-2),transparent);
}
.timeline-item{position:relative;margin-bottom:32px}
.timeline-item:last-child{margin-bottom:0}
.tl-marker{
  position:absolute;left:-31px;top:18px;
  width:14px;height:14px;border-radius:50%;
  background:var(--bg);border:3px solid var(--accent);
  box-shadow:0 0 0 4px rgba(74,222,128,.15);
  z-index:2;
}
.exp-card{transition:all .3s}
.exp-card:hover{
  border-color:var(--accent);transform:translateX(4px);
  box-shadow:-4px 6px 30px rgba(0,0,0,.4),0 0 0 1px var(--accent-glow);
}
.exp-body{padding:24px 26px}
.exp-role{
  font-size:1.2rem;font-weight:600;color:var(--text-strong);
  margin-bottom:4px;
}
.exp-co{color:var(--accent);font-size:.95rem;margin-bottom:6px;font-weight:500}
.exp-meta{
  font-size:.82rem;color:var(--muted);
  margin-bottom:16px;font-family:var(--mono);
}
.exp-meta .mono{color:var(--text)}
.exp-list{list-style:none;margin-bottom:0}
.exp-list li{
  color:var(--muted);font-size:.94rem;
  padding-left:18px;position:relative;margin-bottom:8px;
}
.exp-list li::before{
  content:"›";position:absolute;left:0;
  color:var(--accent);font-weight:700;
}
.exp-list li:last-child{margin-bottom:0}
.exp-tags{
  display:flex;flex-wrap:wrap;gap:6px;
  margin-top:16px;padding-top:14px;
  border-top:1px dashed var(--border);
}
.tag{
  font-family:var(--mono);font-size:.72rem;
  color:var(--accent);
  background:rgba(74,222,128,.07);
  border:1px solid rgba(74,222,128,.2);
  padding:3px 9px;border-radius:4px;
}
.badge-featured{
  margin-left:auto;
  font-family:var(--mono);font-size:.68rem;font-weight:700;
  background:linear-gradient(135deg,var(--amber),#f59e0b);
  color:#0b0f14;
  padding:4px 10px;border-radius:4px;
  letter-spacing:.5px;
}

/* ============ Projects grid ============ */
.proj-grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:20px;
}
.proj-card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:28px;
  transition:all .3s;
  position:relative;overflow:hidden;
}
.proj-card::before{
  content:"";position:absolute;top:0;right:0;
  width:160px;height:160px;
  background:radial-gradient(circle at top right,var(--accent-glow),transparent 70%);
  opacity:0;transition:opacity .4s;
}
.proj-card:hover{
  border-color:var(--accent);transform:translateY(-3px);
  box-shadow:0 12px 40px rgba(0,0,0,.4);
}
.proj-card:hover::before{opacity:1}
.proj-icon{
  font-size:1.5rem;color:var(--accent);
  width:48px;height:48px;
  display:flex;align-items:center;justify-content:center;
  background:var(--surface-2);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  margin-bottom:18px;
  position:relative;z-index:1;
  font-family:var(--mono);
}
.proj-title{
  font-size:1.1rem;font-weight:600;color:var(--text-strong);
  margin-bottom:10px;position:relative;z-index:1;
}
.proj-desc{
  color:var(--muted);font-size:.93rem;margin-bottom:16px;
  position:relative;z-index:1;
}
.proj-tags{display:flex;flex-wrap:wrap;gap:6px;position:relative;z-index:1}

/* ============ Certifications ============ */
.cert-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.cert-card{position:relative;display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:transform .3s cubic-bezier(.2,.9,.3,1.2),border-color .3s,box-shadow .3s}
.cert-card::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--accent),var(--accent-2));transform:scaleX(0);transform-origin:left;transition:transform .4s}
.cert-card:hover{transform:translateY(-6px);border-color:var(--border-strong);box-shadow:0 20px 50px rgba(0,0,0,.5),0 0 0 1px var(--accent-glow)}
.cert-card:hover::before{transform:scaleX(1)}
.cert-header{display:flex;align-items:center;gap:8px;padding:10px 14px;background:var(--surface-2);border-bottom:1px solid var(--border);font-family:var(--mono);font-size:.74rem;color:var(--muted)}
.cert-header .tw-dot{width:10px;height:10px;border-radius:50%;flex-shrink:0}
.cert-header .tw-title{margin-left:6px;color:var(--muted)}
.cert-header .cert-status{margin-left:auto;color:var(--accent);display:flex;align-items:center;gap:5px}
.cert-header .cert-status::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 6px var(--accent)}
.cert-badge-wrap{position:relative;height:200px;display:flex;align-items:center;justify-content:center;padding:28px 24px;background:radial-gradient(ellipse at center,rgba(74,222,128,.06),transparent 70%);overflow:hidden}
.cert-badge-wrap::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(74,222,128,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(74,222,128,.04) 1px,transparent 1px);background-size:24px 24px;pointer-events:none}
.cert-badge-wrap img{max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain;position:relative;z-index:1;filter:drop-shadow(0 8px 24px rgba(0,0,0,.5));transition:transform .4s cubic-bezier(.2,.9,.3,1.2)}
.cert-card:hover .cert-badge-wrap img{transform:scale(1.06) translateY(-2px)}
.cert-body{padding:20px 22px 22px;display:flex;flex-direction:column;flex:1;border-top:1px solid var(--border)}
.cert-meta{font-family:var(--mono);font-size:.74rem;color:var(--muted);margin-bottom:8px;display:flex;gap:8px;align-items:center}
.cert-meta .issuer{color:var(--accent);font-weight:500}
.cert-meta .dim{color:var(--muted-2)}
.cert-title{font-size:1rem;font-weight:600;color:var(--text-strong);line-height:1.35;margin-bottom:10px}
.cert-tags{display:flex;flex-wrap:wrap;gap:5px;margin-bottom:18px}
.cert-tag{font-family:var(--mono);font-size:.68rem;color:var(--accent);background:rgba(74,222,128,.07);border:1px solid rgba(74,222,128,.2);padding:2px 8px;border-radius:4px}
.cert-actions{margin-top:auto;display:flex;gap:8px}
.cert-actions .btn{flex:1;justify-content:center;font-size:.78rem;padding:10px 12px}
@media (max-width:900px){.cert-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){.cert-grid{grid-template-columns:1fr}}

/* ============ Skills ============ */
.skills-blocks{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.skill-block{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  padding:20px 22px;
  transition:border-color .2s;
}
.skill-block:hover{border-color:var(--border-strong)}
.skill-block-header{
  font-family:var(--mono);font-size:.82rem;color:var(--text);
  margin-bottom:14px;padding-bottom:12px;
  border-bottom:1px dashed var(--border);
}
.skill-block-header strong{color:var(--accent);font-weight:500}
.skill-block .skill-tags{display:flex;flex-wrap:wrap;gap:8px}
.skill-pill{
  font-family:var(--mono);font-size:.76rem;
  padding:5px 12px;
  background:var(--surface-2);
  border:1px solid var(--border);
  border-radius:20px;color:var(--text);
  transition:all .2s;
}
.skill-pill:hover{
  border-color:var(--accent);background:rgba(74,222,128,.08);color:var(--accent);
}

/* ============ Education ============ */
.edu-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.edu-card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:26px 28px;position:relative;
  transition:all .3s;
}
.edu-card::before{
  content:"";position:absolute;top:0;left:0;
  width:100%;height:3px;
  background:linear-gradient(90deg,var(--accent),var(--accent-2),transparent);
  border-radius:var(--radius) var(--radius) 0 0;
}
.edu-card:hover{border-color:var(--border-strong);transform:translateY(-2px)}
.edu-period{
  font-family:var(--mono);font-size:.78rem;
  color:var(--accent);margin-bottom:10px;
}
.edu-school{
  font-size:1.15rem;font-weight:600;
  color:var(--text-strong);margin-bottom:4px;
}
.edu-degree{font-size:.92rem;color:var(--muted);margin-bottom:14px}
.edu-desc{font-size:.9rem;color:var(--muted);margin-bottom:14px}
.edu-grade{
  font-family:var(--mono);font-size:.85rem;color:var(--text);
  padding-top:12px;border-top:1px dashed var(--border);
}
.edu-grade strong{color:var(--accent)}

/* ============ Footer ============ */
.footer{
  border-top:1px solid var(--border);
  padding:50px 28px 40px;
  background:var(--bg-elev);
  margin-top:60px;
}
.footer-inner{max-width:var(--max);margin:0 auto;text-align:center}
.footer-prompt{
  font-family:var(--mono);font-size:.92rem;
  color:var(--text);margin-bottom:16px;
}
.footer-meta{
  font-family:var(--mono);font-size:.8rem;color:var(--muted);
  display:flex;align-items:center;justify-content:center;
  gap:14px;flex-wrap:wrap;
}
.footer-meta .sep{color:var(--muted-2)}
.footer-meta a{color:var(--muted)}
.footer-meta a:hover{color:var(--accent)}

/* ============ Responsive ============ */
@media (max-width:900px){
  .hero-grid{grid-template-columns:1fr;gap:48px}
  .hero-right{max-width:340px;margin:0 auto}
  .about-grid{grid-template-columns:1fr;gap:32px}
  .about-stats{width:100%}
  .proj-grid{grid-template-columns:1fr}
  .skills-blocks{grid-template-columns:1fr}
  .edu-grid{grid-template-columns:1fr}
}
@media (max-width:768px){
  .nav-inner{padding:12px 20px}
  .nav-toggle{display:flex}
  .nav-links{
    display:none;position:absolute;top:100%;left:0;right:0;
    flex-direction:column;background:var(--surface);
    border-bottom:1px solid var(--border);padding:8px 12px;gap:2px;
  }
  .nav-links.open{display:flex}
  .nav-links a{display:block;padding:12px 14px}
  .brand-name{display:none}
  .section{padding:70px 20px 60px}
  .hero{padding:60px 20px 70px}
  .h2{font-size:1.35rem}
  .about-stats{grid-template-columns:repeat(2,1fr)}
  .timeline{padding-left:28px}
  .tl-marker{left:-23px;width:12px;height:12px;border-width:2px}
  .exp-body{padding:20px 22px}
  .hero-meta{gap:14px;font-size:.74rem}
  .footer-meta{flex-direction:column;gap:8px}
  .footer-meta .sep{display:none}
  .badge-featured{margin-left:0;margin-top:4px}
}
@media (min-width:1200px){
  :root{--max:1200px}
}

/* A11y: reduced motion */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
  .cursor,.status-dot{animation:none}
  .hero-right .terminal-window{transform:none}
}