:root{
  --bg:#080b11;
  --bg-elev:#10151f;
  --bg-card:#0d121b;
  --line:#1c2532;
  --line-soft:#161d29;
  --accent:#478ac9;
  --accent-bright:#7fb8ec;
  --accent-dim:#22384d;
  --ok:#57d38c;
  --text:#e8edf3;
  --text-dim:#8b96a8;
  --text-faint:#525d6d;
}

*{margin:0;padding:0;box-sizing:border-box;}

html{scroll-behavior:smooth;}

body{
  background:var(--bg);
  color:var(--text);
  font-family:'Inter',sans-serif;
  min-height:100vh;
  overflow-x:hidden;
  position:relative;
}

/* faint map/network grid backdrop */
.grid-bg{
  position:fixed;
  inset:0;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(71,138,201,0.14) 1px, transparent 0);
  background-size:34px 34px;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 20%, #000 40%, transparent 90%);
  pointer-events:none;
  z-index:0;
}

.watermark{
  position:fixed;
  top:4vw;
  right:-3vw;
  font-family:'Space Grotesk',sans-serif;
  font-size:clamp(140px, 20vw, 380px);
  font-weight:700;
  letter-spacing:-0.02em;
  white-space:nowrap;
  color:rgba(71,138,201,0.05);
  line-height:1;
  pointer-events:none;
  z-index:0;
  user-select:none;
}

a{color:inherit;text-decoration:none;}
a:focus-visible, button:focus-visible{
  outline:2px solid var(--accent-bright);
  outline-offset:3px;
  border-radius:4px;
}

.wrap{
  position:relative;
  z-index:1;
  max-width:760px;
  margin:0 auto;
  padding:0 24px;
}

/* header */
header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:28px 0 0;
}

.logo{
  display:flex;
  align-items:baseline;
  gap:10px;
  font-family:'Space Grotesk',sans-serif;
  font-weight:700;
  font-size:20px;
  letter-spacing:0.02em;
}
.logo .sub{
  font-family:'JetBrains Mono',monospace;
  font-size:11px;
  font-weight:400;
  color:var(--text-faint);
  letter-spacing:0.12em;
  text-transform:uppercase;
  border-left:1px solid var(--line);
  padding-left:10px;
}

.status{
  display:flex;
  align-items:center;
  gap:8px;
  font-family:'JetBrains Mono',monospace;
  font-size:11.5px;
  color:var(--text-dim);
  letter-spacing:0.02em;
}
.status .dot{
  width:7px;height:7px;border-radius:50%;
  background:var(--ok);
  box-shadow:0 0 0 0 rgba(87,211,140,0.5);
  animation:pulse-dot 2.4s ease-out infinite;
}
@keyframes pulse-dot{
  0%{box-shadow:0 0 0 0 rgba(87,211,140,0.45);}
  70%{box-shadow:0 0 0 7px rgba(87,211,140,0);}
  100%{box-shadow:0 0 0 0 rgba(87,211,140,0);}
}

/* hero */
.hero{
  text-align:center;
  padding:76px 0 8px;
}
.eyebrow{
  font-family:'JetBrains Mono',monospace;
  font-size:12px;
  letter-spacing:0.22em;
  text-transform:uppercase;
  color:var(--accent-bright);
  margin-bottom:18px;
}
h1{
  font-family:'Space Grotesk',sans-serif;
  font-weight:600;
  font-size:clamp(32px,5.6vw,58px);
  line-height:1.08;
  letter-spacing:-0.01em;
  margin-bottom:18px;
}
h1 em{
  font-style:normal;
  color:var(--accent-bright);
}
.lede{
  max-width:480px;
  margin:0 auto;
  color:var(--text-dim);
  font-size:16px;
  line-height:1.6;
}

/* radar / router visual */
.net{
  max-width:720px;
  margin:56px auto 0;
  display:grid;
  grid-template-columns:1fr 2px 1fr;
  grid-template-rows:196px auto auto;
  column-gap:0;
  row-gap:22px;
  padding:0 0 60px;
  position:relative;
  z-index:1;
}

.radar-cell{ grid-column:1/4; grid-row:1; position:relative; }

/* glowing junction where the trunk meets the radar */
.radar-cell::after{
  content:'';
  position:absolute;
  bottom:0;
  left:50%;
  transform:translate(-50%, 50%);
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--accent-bright);
  box-shadow:0 0 8px 2px rgba(127,184,236,0.75);
  z-index:2;
}

.radar{
  position:absolute;
  top:0; left:50%;
  transform:translateX(-50%);
  width:196px;
  height:196px;
  border-radius:50%;
  border:1px solid var(--line);
  background:
    repeating-radial-gradient(circle at center,
      transparent 0, transparent 30px,
      rgba(71,138,201,0.07) 31px, rgba(71,138,201,0.07) 32px);
}
.radar::before{
  content:'';
  position:absolute;
  inset:0;
  border-radius:50%;
  background:conic-gradient(from 0deg, transparent 0deg, rgba(71,138,201,0.5) 32deg, transparent 60deg);
  animation:sweep 5s linear infinite;
}
.radar::after{
  content:'';
  position:absolute;
  inset:0;
  border-radius:50%;
  box-shadow:inset 0 0 24px rgba(71,138,201,0.12);
}
@keyframes sweep{ to{ transform:rotate(360deg); } }

.radar .core{
  position:absolute;
  top:50%; left:50%;
  width:8px; height:8px;
  margin:-4px 0 0 -4px;
  border-radius:50%;
  background:var(--accent-bright);
  box-shadow:0 0 12px 2px rgba(127,184,236,0.6);
}
.radar .tick{
  position:absolute;
  font-family:'JetBrains Mono',monospace;
  font-size:10px;
  color:var(--text-faint);
  letter-spacing:0.05em;
}
.tick.n{ top:-18px; left:50%; transform:translateX(-50%); color:var(--accent-bright); }
.tick.s{ bottom:-18px; left:50%; transform:translateX(-50%); }
.tick.e{ right:-20px; top:50%; transform:translateY(-50%); }
.tick.w{ left:-20px; top:50%; transform:translateY(-50%); }

/* sonar blips - flash exactly when the sweep passes over them, synced to
   the same 5s rotation as .radar::before. Positions are angle+radius points
   inside the circle; animation-delay is calculated so each blip's peak
   lines up with the sweep's bright band crossing that angle. */
.radar .blip{
  position:absolute;
  width:5px;
  height:5px;
  border-radius:50%;
  background:var(--ok);
  box-shadow:0 0 6px 1px rgba(87,211,140,0.7);
  opacity:0;
  animation:blip 5s linear infinite;
}
.blip.b1{ top:50px;  left:134px; animation-delay:.1s; }
.blip.b2{ top:166px; left:70px;  animation-delay:2.33s; }
.blip.b3{ top:73px;  left:57px;  animation-delay:3.72s; }
@keyframes blip{
  0%{ opacity:0; transform:scale(.5); }
  8%{ opacity:1; transform:scale(1.4); }
  20%{ opacity:.35; transform:scale(1); }
  35%, 100%{ opacity:0; transform:scale(.8); }
}

/* trunk + branch connectors - side-entry into each card's vertical
   middle, with a real moving packet dot on active connections */
.trunk{
  grid-column:2;
  grid-row:2 / 4;
  width:2px;
  justify-self:center;
  background:var(--accent);
  position:relative;
  z-index:0;
}

/* packet that starts at the radar and travels the full trunk length,
   continuously - the "data originates at the radar" motion */
.trunk::after{
  content:'';
  position:absolute;
  left:50%;
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--accent-bright);
  box-shadow:0 0 6px 2px rgba(127,184,236,0.85);
  transform:translateX(-50%);
  animation:packet-down-trunk 2.6s linear infinite;
}
@keyframes packet-down-trunk{
  0%{ top:0%; opacity:0; }
  6%{ opacity:1; }
  96%{ opacity:1; }
  100%{ top:100%; opacity:0; }
}

.branch{
  grid-row:2;
  align-self:center;
  justify-self:start;
  height:2px;
  width:44px;
  background:var(--line);
  position:relative;
  z-index:0;
}
.branch.row2{ grid-row:3; }
.branch.left{ grid-column:1; justify-self:end; }
.branch.right{ grid-column:3; justify-self:start; }

/* the wire itself: faint constant line, active ones glow a little */
.branch:not(.offline){
  background:var(--accent-dim);
}

/* moving packet - travels from the trunk out into the card, repeating */
.branch:not(.offline)::after{
  content:'';
  position:absolute;
  top:50%;
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--accent-bright);
  box-shadow:0 0 6px 2px rgba(127,184,236,0.85);
  transform:translateY(-50%);
  animation:packet-into-card 1.6s linear infinite;
}
.branch.left::after{ animation-name:packet-into-left; }
.branch.right::after{ animation-name:packet-into-right; }
@keyframes packet-into-left{ 0%{ left:100%; opacity:0; } 12%{ opacity:1; } 92%{ opacity:1; } 100%{ left:0%; opacity:0; } }
@keyframes packet-into-right{ 0%{ left:0%; opacity:0; } 12%{ opacity:1; } 92%{ opacity:1; } 100%{ left:100%; opacity:0; } }

/* offline branch - plain static gray line, no packet */
.branch.offline{
  background:var(--line-soft);
}

/* link cards */
.node-card.tl{ grid-column:1; grid-row:2; margin-right:44px; }
.node-card.tr{ grid-column:3; grid-row:2; margin-left:44px; }
.node-card.bl{ grid-column:1; grid-row:3; margin-right:44px; }
.node-card.br{ grid-column:3; grid-row:3; margin-left:44px; }

.node-card{
  position:relative;
  z-index:1;
  background:linear-gradient(180deg, var(--bg-elev) 0%, var(--bg-card) 100%);
  border:1px solid var(--line);
  border-radius:14px;
  padding:24px 22px;
  display:flex;
  flex-direction:column;
  gap:10px;
  transition:border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.node-card:hover, .node-card:focus-within{
  border-color:var(--accent-dim);
  transform:translateY(-3px);
  box-shadow:0 14px 30px -18px rgba(71,138,201,0.5);
}

/* rack server icon - visual anchor for what each route connects to */
.rack-icon{ display:block; margin-bottom:2px; }
.rack-icon .led{
  fill:var(--ok);
  animation:led-blink 2.1s ease-in-out infinite;
}
.rack-icon .led.led2{
  fill:var(--accent-bright);
  animation-delay:.5s;
}
@keyframes led-blink{
  0%, 100%{ opacity:1; }
  50%{ opacity:.25; }
}

/* offline card variant */
.node-card.offline{
  border-style:dashed;
  opacity:.72;
}
.node-card.offline .node-title{ color:var(--text-dim); }
.node-card.offline .rack-icon .led{
  animation:none;
  fill:var(--text-faint);
}
.node-card.offline:hover, .node-card.offline:focus-within{
  transform:none;
  box-shadow:none;
  border-color:var(--line);
}

.status-badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-family:'JetBrains Mono',monospace;
  font-size:10.5px;
  letter-spacing:0.08em;
  text-transform:uppercase;
  color:var(--text-faint);
}
.status-badge .dot-static{
  width:6px;height:6px;border-radius:50%;
  background:var(--text-faint);
}

.node-label{
  font-family:'JetBrains Mono',monospace;
  font-size:11px;
  letter-spacing:0.1em;
  color:var(--accent-bright);
  display:flex;
  align-items:center;
  gap:8px;
}
.node-label .idx{ color:var(--text-faint); }

.node-title{
  font-family:'Space Grotesk',sans-serif;
  font-weight:600;
  font-size:19px;
}
.node-desc{
  color:var(--text-dim);
  font-size:13.5px;
  line-height:1.55;
  flex-grow:1;
}
.node-note{
  font-family:'JetBrains Mono',monospace;
  font-size:10.5px;
  color:var(--text-faint);
  font-style:italic;
}

.node-actions{
  display:flex;
  gap:8px;
  margin-top:6px;
  flex-wrap:wrap;
}

.btn{
  font-family:'Inter',sans-serif;
  font-size:13px;
  font-weight:500;
  padding:9px 14px;
  border-radius:8px;
  border:1px solid var(--line);
  background:transparent;
  color:var(--text);
  cursor:pointer;
  transition:background .15s ease, border-color .15s ease, color .15s ease;
  display:inline-flex;
  align-items:center;
  gap:6px;
}
.btn.primary{
  background:var(--accent);
  border-color:var(--accent);
  color:#0a1420;
}
.btn.primary:hover{ background:var(--accent-bright); border-color:var(--accent-bright); }
.btn:not(.primary):hover{ border-color:var(--accent-dim); color:var(--accent-bright); }
.btn:disabled{
  opacity:.5;
  cursor:not-allowed;
  border-color:var(--line);
  color:var(--text-faint);
}
.btn:disabled:hover{ background:transparent; border-color:var(--line); color:var(--text-faint); }

/* footer */
footer{
  border-top:1px solid var(--line-soft);
  padding:22px 0 34px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:10px;
}
footer p{
  font-family:'JetBrains Mono',monospace;
  font-size:11px;
  color:var(--text-faint);
  letter-spacing:0.03em;
}
footer .north{
  color:var(--text-dim);
  font-family:'Space Grotesk',sans-serif;
  font-weight:600;
  font-size:12px;
}

@media (max-width:560px){
  .net{
    grid-template-columns:1fr;
    grid-template-rows:196px auto auto auto auto;
    padding-bottom:70px;
  }
  .trunk, .branch, .radar-cell::after{ display:none; }
  .node-card.tl, .node-card.tr, .node-card.bl, .node-card.br{
    grid-column:1;
    margin-left:0;
    margin-right:0;
  }
  .node-card.tl{ grid-row:2; }
  .node-card.tr{ grid-row:3; }
  .node-card.bl{ grid-row:4; }
  .node-card.br{ grid-row:5; }
  header{ flex-direction:column; align-items:flex-start; gap:12px; }
}

@media (prefers-reduced-motion: reduce){
  .radar::before, .status .dot, .branch::after, .trunk::after, .radar .blip, .rack-icon .led, html{
    animation:none !important;
  }
}