:root{
  /* deck */
  --ink:#0B0E14;            /* page */
  --deck:#0F141E;           /* base panel */
  --panel:#141A27;          /* raised panel */
  --panel-2:#192234;        /* inset / hover */
  --line:#232C3E;           /* hairline */
  --line-2:#2E3A52;
  --grid:#19212F;           /* chart gridlines */
  --txt:#E7ECF5;            /* primary text */
  --txt-2:#93A0B8;          /* muted */
  --txt-3:#5E6B83;          /* faint */
  /* signal channels (oscilloscope traces) */
  --c-down:#4DD0E1;         /* download / cyan */
  --c-up:#A78BFA;           /* upload / violet */
  --c-lat:#F6B66B;          /* latency unloaded / amber */
  --c-load:#F8746A;         /* loaded latency / coral */
  --c-jit:#7BDC8A;          /* jitter / green */
  --c-hetzner:#F2B53D;      /* gold */
  --c-ovh:#FF82BD;          /* pink */
  --c-vultr:#5B8DEF;        /* blue */
  --c-cf:#4DD0E1;           /* cloudflare = cyan (matches download) */
  /* status */
  --ok:#46D17C;
  --err:#FF5C5C;
  --warn:#F6B66B;
  --radius:14px;
  --radius-s:9px;
  --bezel:0 1px 0 rgba(255,255,255,.04) inset, 0 0 0 1px var(--line), 0 18px 40px -24px rgba(0,0,0,.9);
  --shadow:0 18px 40px -28px rgba(0,0,0,.85);
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(77,208,225,.05), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(167,139,250,.045), transparent 55%),
    var(--ink);
  color:var(--txt);
  font-family:"Inter",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  -webkit-font-smoothing:antialiased;
  font-size:14px;
  line-height:1.45;
}
.mono{font-family:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;font-variant-numeric:tabular-nums}
h1,h2,h3{font-family:"Space Grotesk",system-ui,sans-serif;font-weight:600;letter-spacing:-.01em;margin:0}
a{color:var(--c-down)}
button{font-family:inherit}
::selection{background:rgba(77,208,225,.3)}

/* ---------- App shell ---------- */
.wrap{max-width:1180px;margin:0 auto;padding:22px 18px 80px}
.topbar{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:18px}
.brand{display:flex;align-items:center;gap:11px}
.logo{
  width:38px;height:38px;border-radius:10px;flex:0 0 auto;position:relative;
  background:linear-gradient(150deg,#16203044,#101722);
  box-shadow:var(--bezel);display:grid;place-items:center;overflow:hidden;
}
.logo svg{width:24px;height:24px}
.brand .t1{font-family:"Space Grotesk";font-weight:700;font-size:15px;letter-spacing:.02em;line-height:1}
.brand .t2{font-size:11px;color:var(--txt-2);letter-spacing:.14em;text-transform:uppercase;margin-top:3px}
.spacer{flex:1}
.toolbar{display:flex;gap:8px;align-items:center;flex-wrap:wrap}

.seg{display:inline-flex;background:var(--deck);border:1px solid var(--line);border-radius:10px;padding:3px;gap:2px}
.seg button{
  border:0;background:transparent;color:var(--txt-2);font-size:12px;font-weight:500;
  padding:6px 11px;border-radius:7px;cursor:pointer;letter-spacing:.01em;transition:.12s;white-space:nowrap;
}
.seg button:hover{color:var(--txt)}
.seg button[aria-pressed="true"]{background:var(--panel-2);color:var(--txt);box-shadow:0 1px 0 rgba(255,255,255,.05) inset}
.seg button:focus-visible{outline:2px solid var(--c-down);outline-offset:2px}

.btn{
  display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line);background:var(--deck);
  color:var(--txt);font-size:12.5px;font-weight:500;padding:7px 13px;border-radius:9px;cursor:pointer;transition:.12s;
}
.btn:hover{border-color:var(--line-2);background:var(--panel)}
.btn:focus-visible{outline:2px solid var(--c-down);outline-offset:2px}
.btn.ghost{background:transparent}

/* ---------- Dropzone ---------- */
.drop{
  margin-top:6px;border:1.5px dashed var(--line-2);border-radius:18px;background:
    linear-gradient(180deg, rgba(255,255,255,.012), transparent), var(--deck);
  padding:54px 28px;text-align:center;transition:.16s;cursor:pointer;position:relative;overflow:hidden;
}
.drop.drag{border-color:var(--c-down);background:rgba(77,208,225,.06)}
.drop:focus-visible{outline:2px solid var(--c-down);outline-offset:3px}
.drop .scope{width:88px;height:88px;margin:0 auto 18px;display:grid;place-items:center;border-radius:50%;
  background:radial-gradient(circle at 50% 40%, rgba(77,208,225,.14), transparent 65%);}
.drop h2{font-size:21px;margin-bottom:8px}
.drop p{color:var(--txt-2);margin:0 auto;max-width:440px;font-size:13.5px}
.drop .formats{margin-top:16px;display:inline-flex;gap:8px}
.tag{font-family:"JetBrains Mono";font-size:11px;color:var(--txt-2);border:1px solid var(--line);background:var(--deck);
  padding:4px 9px;border-radius:6px;letter-spacing:.04em}
.muted-link{color:var(--txt-3);font-size:12px;margin-top:18px;display:block}
.sample-links{text-align:center;color:var(--txt-3);font-size:12.5px;margin:14px auto 0}
.sample-links a{color:var(--c-down)}

.loading{display:flex;align-items:center;justify-content:center;gap:12px;color:var(--txt-2);padding:40px;font-size:13px}
.spin{width:18px;height:18px;border:2px solid var(--line-2);border-top-color:var(--c-down);border-radius:50%;animation:sp .7s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}
.errbox{border:1px solid var(--err);background:rgba(255,92,92,.08);color:#ffd9d9;border-radius:12px;padding:14px 16px;margin-top:14px;font-size:13px}

.demo-banner{display:flex;align-items:center;justify-content:space-between;gap:16px;
  border:1px solid rgba(255,92,92,.35);background:rgba(255,92,92,.1);color:var(--txt);
  border-radius:12px;padding:10px 14px;margin-bottom:16px;font-size:13px}
.demo-banner .btn{flex:none;background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.16)}
.demo-banner .btn:hover{background:rgba(255,255,255,.14)}

/* ---------- Layout grids ---------- */
.hidden{display:none !important}
section.view{margin-top:18px}

/* instrument header / verdict */
.instrument{
  border-radius:var(--radius);background:linear-gradient(180deg, var(--panel), var(--deck));
  box-shadow:var(--bezel);padding:18px 20px;position:relative;overflow:hidden;
}
.instrument::before,.instrument::after{content:"";position:absolute;width:10px;height:10px;border:1px solid var(--line-2);}
.instrument::before{top:10px;left:10px;border-right:0;border-bottom:0}
.instrument::after{top:10px;right:10px;border-left:0;border-bottom:0}
.inst-top{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;flex-wrap:wrap}
.verdict-wrap{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.led{width:11px;height:11px;border-radius:50%;flex:0 0 auto;box-shadow:0 0 0 3px rgba(255,255,255,.03)}
.led.ok{background:var(--ok);box-shadow:0 0 12px 1px rgba(70,209,124,.6),0 0 0 3px rgba(70,209,124,.12)}
.led.warn{background:var(--warn);box-shadow:0 0 12px 1px rgba(246,182,107,.6),0 0 0 3px rgba(246,182,107,.12)}
.led.err{background:var(--err);box-shadow:0 0 12px 1px rgba(255,92,92,.6),0 0 0 3px rgba(255,92,92,.12)}
.verdict .label{font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--txt-3)}
.verdict .headline{font-family:"Space Grotesk";font-size:20px;font-weight:600;margin-top:2px}
.period{font-size:12px;color:var(--txt-2);text-align:right}
.period .mono{color:var(--txt);font-size:12px}

/* readout row */
.readouts{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:1px;margin-top:18px;
  background:var(--line);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.ro{background:var(--deck);padding:13px 15px}
.ro .k{font-size:10.5px;letter-spacing:.13em;text-transform:uppercase;color:var(--txt-3);display:flex;align-items:center;gap:6px}
.ro .swatch{width:8px;height:8px;border-radius:2px;flex:0 0 auto}
.ro .v{font-family:"JetBrains Mono";font-size:24px;font-weight:500;margin-top:6px;letter-spacing:-.02em}
.ro .v small{font-size:12px;color:var(--txt-2);font-weight:400;margin-left:3px}
.ro .sub{font-size:11px;color:var(--txt-2);margin-top:2px;font-family:"JetBrains Mono"}
.ro .sub.good{color:var(--ok)} .ro .sub.bad{color:var(--err)} .ro .sub.warnc{color:var(--warn)}

/* sparkline strip */
.strip{margin-top:16px;border:1px solid var(--line);border-radius:12px;background:var(--deck);padding:12px 14px}
.strip .sl{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}
.strip .sl .ttl{font-size:11px;letter-spacing:.13em;text-transform:uppercase;color:var(--txt-3)}
.strip .sl .now{font-family:"JetBrains Mono";font-size:12px;color:var(--c-down)}
.strip .scope-wrap{position:relative;height:64px}
.strip canvas{display:block}

/* tabs */
.tabs{display:flex;gap:4px;margin-top:22px;border-bottom:1px solid var(--line);overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.tab{
  border:0;background:transparent;color:var(--txt-2);font-size:13px;font-weight:500;padding:11px 14px 13px;
  cursor:pointer;position:relative;white-space:nowrap;transition:.12s;letter-spacing:.005em;
}
.tab:hover{color:var(--txt)}
.tab[aria-selected="true"]{color:var(--txt)}
.tab[aria-selected="true"]::after{content:"";position:absolute;left:10px;right:10px;bottom:-1px;height:2px;background:var(--c-down);border-radius:2px}
.tab:focus-visible{outline:2px solid var(--c-down);outline-offset:-3px;border-radius:6px}

/* panels */
.panel{border-radius:var(--radius);background:var(--panel);box-shadow:var(--bezel);padding:16px 18px 18px;margin-top:16px}
.panel-h{display:flex;align-items:baseline;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-bottom:4px}
.panel-h h3{font-size:15px}
.panel-h .desc{font-size:12px;color:var(--txt-2);max-width:560px}
.panel-controls{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin:12px 0 6px}
.chart-box{position:relative;width:100%;height:340px;margin-top:8px}
.chart-box.tall{height:400px}
.empty{display:grid;place-items:center;height:100%;color:var(--txt-3);font-size:13px;text-align:center;gap:6px}

.legend-inline{display:flex;flex-wrap:wrap;gap:14px;margin-top:12px}
.chk-label{font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--txt-3);align-self:center}
.chk-row{display:inline-flex;flex-wrap:wrap;gap:7px}
.chk-sep{width:1px;height:20px;background:var(--line);margin:0 2px;align-self:center}
.chk{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:var(--deck);color:var(--txt-2);
  font-size:12px;padding:5px 10px;border-radius:8px;cursor:pointer;transition:.12s;user-select:none}
.chk:hover{border-color:var(--line-2);color:var(--txt)}
.chk[aria-pressed="true"]{color:var(--txt);background:var(--panel-2)}
.chk .box{width:11px;height:11px;border-radius:3px;border:1.5px solid currentColor;flex:0 0 auto;position:relative}
.chk[aria-pressed="true"] .box{background:currentColor}
.chk .swh{width:14px;height:0;border-top:2px dashed currentColor;flex:0 0 auto}
.chk:focus-visible{outline:2px solid var(--c-down);outline-offset:2px}
.li{display:inline-flex;align-items:center;gap:7px;font-size:12px;color:var(--txt-2)}
.li .dot{width:9px;height:9px;border-radius:2px;flex:0 0 auto}

/* small stat cards row */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;margin-top:6px}
.stat{border:1px solid var(--line);border-radius:11px;background:var(--deck);padding:13px 15px}
.stat .k{font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--txt-3)}
.stat .v{font-family:"JetBrains Mono";font-size:21px;margin-top:5px}
.stat .v small{font-size:11px;color:var(--txt-2)}

.fld{display:inline-flex;flex-direction:column;gap:4px;font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--txt-3)}
.instrument-controls{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px;padding-top:10px;border-top:1px solid var(--line);}
.instrument-controls .fld{min-width:150px;flex:1 1 180px;}
.instrument-controls .fld span{font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--txt-3);}
.instrument-controls .note{font-size:11px;color:var(--txt-3);align-self:flex-end;max-width:220px;}
input[type=number],input[type=text]{
  background:var(--deck);border:1px solid var(--line);color:var(--txt);border-radius:8px;padding:7px 10px;
  font-family:"JetBrains Mono";font-size:13px;width:120px;
}
input:focus{outline:2px solid var(--c-down);outline-offset:0;border-color:transparent}

/* dispute / evidence */
.evidence{border-radius:var(--radius);background:var(--panel);box-shadow:var(--bezel);padding:0;overflow:hidden;margin-top:16px}
.ev-head{padding:18px 22px;border-bottom:1px solid var(--line);background:linear-gradient(180deg,var(--panel-2),transparent)}
.ev-head .eyebrow{font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--txt-3)}
.ev-head h2{font-size:20px;margin-top:5px}
.ev-head .sum{font-size:13.5px;color:var(--txt);margin-top:10px;line-height:1.6;max-width:760px}
.ev-head .sum b{color:var(--c-down);font-weight:600}
.ev-head .sum .bad{color:var(--err);font-weight:600}
.ev-body{padding:18px 22px}
.ev-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.ev-cell{background:var(--deck);padding:15px 17px}
.ev-cell .t{font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--txt-3);margin-bottom:10px}
.ev-row{display:flex;justify-content:space-between;align-items:baseline;padding:5px 0;font-size:13px}
.ev-row .lab{color:var(--txt-2)}
.ev-row .num{font-family:"JetBrains Mono";font-size:14px}
.ev-foot{padding:14px 22px;border-top:1px solid var(--line);font-size:11.5px;color:var(--txt-3);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

.pill{display:inline-flex;align-items:center;gap:6px;font-size:11px;font-family:"JetBrains Mono";padding:3px 9px;border-radius:20px;border:1px solid var(--line)}
.pill.good{color:var(--ok);border-color:rgba(70,209,124,.4);background:rgba(70,209,124,.08)}
.pill.bad{color:var(--err);border-color:rgba(255,92,92,.4);background:rgba(255,92,92,.08)}
.pill.warn{color:var(--warn);border-color:rgba(246,182,107,.4);background:rgba(246,182,107,.08)}

.note{font-size:11.5px;color:var(--txt-3);margin-top:12px;line-height:1.5}
.footer{margin-top:34px;text-align:center;color:var(--txt-3);font-size:11.5px;line-height:1.7}

@media (max-width:640px){
  .wrap{padding:16px 12px 70px}
  .verdict .headline{font-size:17px}
  .period{text-align:left}
  .ro .v{font-size:20px}
  .chart-box{height:300px}
}
@media (prefers-reduced-motion: reduce){
  .spin{animation:none}
  *{scroll-behavior:auto}
}