/* =========================================================================
   NSTools 2026 — shared theme
   White-base "circuit" aesthetic: the visual signature is a network graph
   (nodes + edges) since the workshop's subject is literally network
   topology and discrete-event simulation. Built on Bootstrap 5.
   ========================================================================= */

:root{
  --nt-white:      #ffffff;
  --nt-paper:      #f6f8fb;
  --nt-line:       #dbe3ee;
  --nt-navy:       #0b1d3a;
  --nt-navy-2:     #12294f;
  --nt-cyan:       #0891b2;
  --nt-cyan-2:     #00b8d4;
  --nt-signal:     #16a34a;
  --nt-amber:      #c2760c;
  --nt-text:       #1a2332;
  --nt-text-soft:  #4b5768;
  --nt-mono:       "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --nt-display:    "Sora", "Space Grotesk", system-ui, sans-serif;
  --nt-body:       "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --nt-radius:     10px;
}

html{ scroll-behavior:smooth; }

body{
  background:var(--nt-white);
  color:var(--nt-text);
  font-family:var(--nt-body);
  font-size:1.02rem;
  line-height:1.7;
}

h1,h2,h3,h4,.nt-display{
  font-family:var(--nt-display);
  color:var(--nt-navy);
  letter-spacing:-0.01em;
}

a{ color:var(--nt-cyan); text-decoration:none; }
a:hover{ color:var(--nt-navy); text-decoration:underline; }

code, .nt-mono, .badge, .nt-meta{ font-family:var(--nt-mono); }

::selection{ background:var(--nt-cyan-2); color:#fff; }

/* Focus visibility (accessibility, per design floor) */
a:focus-visible, button:focus-visible, .nav-link:focus-visible{
  outline:2px solid var(--nt-cyan-2);
  outline-offset:3px;
}

@media (prefers-reduced-motion: reduce){
  *{ animation:none !important; transition:none !important; }
}

/* ---------- Topbar ---------- */
.nt-topbar{
  background:var(--nt-navy);
  color:#cfe3f5;
  font-family:var(--nt-mono);
  font-size:.78rem;
  letter-spacing:.04em;
}
.nt-topbar a{ color:#9fd7ea; }
.nt-topbar a:hover{ color:#fff; }

/* ---------- Navbar ---------- */
.nt-navbar{
  background:var(--nt-white);
  border-bottom:1px solid var(--nt-line);
}
.nt-brand{
  font-family:var(--nt-display);
  font-weight:700;
  font-size:1.35rem;
  color:var(--nt-navy) !important;
  display:flex; align-items:center; gap:.55rem;
}
.nt-brand .nt-node{
  width:10px;height:10px;border-radius:50%;
  background:var(--nt-cyan-2);
  box-shadow:0 0 0 4px rgba(0,184,212,.15);
  display:inline-block;
}
.nt-navbar .nav-link{
  color:var(--nt-text-soft);
  font-weight:600;
  font-size:.92rem;
  padding:.5rem .8rem !important;
}
.nt-navbar .nav-link.active,
.nt-navbar .nav-link:hover{ color:var(--nt-navy); }
.nt-navbar .nav-link.active{
  border-bottom:2px solid var(--nt-cyan-2);
}

/* ---------- Hero / circuit background ---------- */
.nt-hero{
  position:relative;
  background:var(--nt-paper);
  border-bottom:1px solid var(--nt-line);
  overflow:hidden;
}
.nt-hero-graph{
  position:absolute; inset:0;
  width:100%; height:100%;
  opacity:.55;
  pointer-events:none;
}
.nt-hero-inner{ position:relative; z-index:2; }
.nt-eyebrow{
  font-family:var(--nt-mono);
  font-size:.78rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--nt-cyan);
  display:inline-flex; align-items:center; gap:.5rem;
}
.nt-eyebrow::before{
  content:"";
  width:22px;height:1px;background:var(--nt-cyan);
  display:inline-block;
}
.nt-hero h1{
  font-size:clamp(2rem, 4vw, 3.1rem);
  font-weight:700;
  margin-top:.6rem;
}
.nt-hero .lead{
  color:var(--nt-text-soft);
  font-size:1.15rem;
  max-width:640px;
}

/* ---------- Cards ---------- */
.nt-card{
  background:var(--nt-white);
  border:1px solid var(--nt-line);
  border-radius:var(--nt-radius);
  padding:1.6rem;
  height:100%;
  transition:transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.nt-card:hover{
  transform:translateY(-3px);
  border-color:var(--nt-cyan-2);
  box-shadow:0 12px 28px -18px rgba(11,29,58,.35);
}
.nt-card .nt-tag{
  display:inline-block;
  font-family:var(--nt-mono);
  font-size:.72rem;
  letter-spacing:.06em;
  color:var(--nt-cyan);
  background:rgba(8,145,178,.08);
  border:1px solid rgba(8,145,178,.25);
  padding:.15rem .55rem;
  border-radius:99px;
  margin-bottom:.7rem;
}

/* ---------- Session / schedule blocks ---------- */
.nt-session{
  border-left:3px solid var(--nt-cyan-2);
  padding:.25rem 0 .25rem 1.2rem;
  margin-bottom:1.1rem;
}
.nt-session .nt-time{
  font-family:var(--nt-mono);
  font-size:.82rem;
  color:var(--nt-cyan);
  display:block;
  margin-bottom:.15rem;
}
.nt-paper-title{ font-weight:700; color:var(--nt-navy); }
.nt-affil{ color:var(--nt-text-soft); font-size:.92rem; }

.nt-slot-header{
  background:var(--nt-navy);
  color:#fff;
  border-radius:var(--nt-radius);
  padding:.55rem 1.1rem;
  font-family:var(--nt-mono);
  font-size:.85rem;
  display:inline-flex;
  align-items:center;
  gap:.6rem;
  margin:1.6rem 0 .9rem;
}

/* ---------- Section labels ---------- */
.nt-section-label{
  font-family:var(--nt-mono);
  font-size:.75rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--nt-text-soft);
  border-bottom:1px solid var(--nt-line);
  padding-bottom:.6rem;
  margin-bottom:1.4rem;
}

/* ---------- Panels (EEAT / info boxes) ---------- */
.nt-panel{
  background:var(--nt-paper);
  border:1px solid var(--nt-line);
  border-radius:var(--nt-radius);
  padding:1.4rem 1.6rem;
}
.nt-panel.nt-panel-accent{
  border-left:4px solid var(--nt-cyan-2);
}

/* ---------- Author / review byline ---------- */
.nt-byline{
  display:flex; gap:1rem; align-items:flex-start;
  background:var(--nt-paper);
  border:1px solid var(--nt-line);
  border-radius:var(--nt-radius);
  padding:1.1rem 1.3rem;
}
.nt-avatar{
  width:46px;height:46px;border-radius:50%;
  background:linear-gradient(135deg, var(--nt-navy), var(--nt-cyan-2));
  flex:none;
}
.nt-byline .name{ font-weight:700; color:var(--nt-navy); }
.nt-byline .role{ color:var(--nt-text-soft); font-size:.88rem; }
.nt-byline .updated{
  font-family:var(--nt-mono); font-size:.78rem; color:var(--nt-cyan);
}

/* ---------- Buttons ---------- */
.btn-nt{
  background:var(--nt-navy);
  color:#fff;
  border-radius:8px;
  font-weight:600;
  padding:.6rem 1.3rem;
  border:1px solid var(--nt-navy);
}
.btn-nt:hover{ background:var(--nt-cyan); border-color:var(--nt-cyan); color:#fff; }
.btn-nt-outline{
  background:transparent;
  color:var(--nt-navy);
  border:1px solid var(--nt-line);
  border-radius:8px;
  font-weight:600;
  padding:.6rem 1.3rem;
}
.btn-nt-outline:hover{ border-color:var(--nt-cyan-2); color:var(--nt-cyan); }

/* ---------- Footer ---------- */
.nt-footer{
  background:var(--nt-navy);
  color:#c8d6e8;
  margin-top:4rem;
}
.nt-footer a{ color:#bfe6f2; }
.nt-footer a:hover{ color:#fff; }
.nt-footer h6{
  font-family:var(--nt-mono);
  color:#7fb8cc;
  letter-spacing:.1em;
  font-size:.75rem;
  text-transform:uppercase;
}
.nt-footer hr{ border-color:rgba(255,255,255,.12); }

/* ---------- Breadcrumb ---------- */
.nt-breadcrumb{
  font-family:var(--nt-mono);
  font-size:.82rem;
  color:var(--nt-text-soft);
}
.nt-breadcrumb a{ color:var(--nt-text-soft); }
.nt-breadcrumb a:hover{ color:var(--nt-cyan); }

/* ---------- Article typography ---------- */
.nt-article h2{ margin-top:2.2rem; font-size:1.55rem; }
.nt-article h3{ margin-top:1.6rem; font-size:1.2rem; }
.nt-article p{ color:var(--nt-text); }
.nt-article .lead{ color:var(--nt-text-soft); }
.nt-toc{
  background:var(--nt-paper);
  border:1px solid var(--nt-line);
  border-radius:var(--nt-radius);
  padding:1.2rem 1.4rem;
}
.nt-toc a{ color:var(--nt-text); font-size:.92rem; }
.nt-toc a:hover{ color:var(--nt-cyan); }

.nt-source-list li{ margin-bottom:.5rem; font-size:.92rem; }

/* ---------- Blog index cards ---------- */
.nt-blog-card .nt-tag{ margin-right:.3rem; }

/* ---------- Table ---------- */
.nt-table th{
  font-family:var(--nt-mono);
  font-size:.72rem;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--nt-text-soft);
  border-bottom:2px solid var(--nt-line);
}
.nt-table td{ border-bottom:1px solid var(--nt-line); vertical-align:top; }