:root {
  color-scheme: dark;
  --bg: #070b10;
  --elev: rgba(20, 27, 36, 0.82);
  --line: rgba(255, 255, 255, 0.1);
  --text: #e8eef6;
  --muted: #8b9bb0;
  --accent: #2aabee;
  --ok: #3dd68c;
  --warn: #f0a35e;
  --danger: #ff6b6b;
  --radius: 16px;
  font-family: "Segoe UI", "SF Pro Text", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--text);
}

body {
  background:
    radial-gradient(700px 420px at 12% -10%, rgba(42, 171, 238, 0.18), transparent 55%),
    radial-gradient(560px 360px at 90% 10%, rgba(167, 139, 250, 0.12), transparent 55%),
    radial-gradient(500px 320px at 50% 100%, rgba(52, 211, 153, 0.08), transparent 55%),
    var(--bg);
}

.shell {
  max-width: 920px;
  margin: 0 auto;
  padding: 20px 16px 40px;
}

.top {
  display: flex;
  align-items: center;
  margin-bottom: 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  object-fit: cover;
  display: block;
  flex-shrink: 0;
  box-shadow: 0 4px 16px rgba(42, 171, 238, 0.35);
  background: #146a9a;
}

.brand strong {
  display: block;
  font-size: 16px;
}

.brand span {
  display: block;
  font-size: 12px;
  color: var(--muted);
}

.main {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.card {
  background: var(--elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  backdrop-filter: blur(12px);
}

.card h2 {
  margin: 0 0 12px;
  font-size: 14px;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14px;
  color: var(--muted);
}

.field input {
  width: 140px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.25);
  color: var(--text);
  font-size: 16px;
  font-weight: 600;
  outline: none;
}

.field input:focus {
  border-color: rgba(42, 171, 238, 0.55);
}

.hint {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--muted);
}

.hint a {
  color: var(--accent);
  text-decoration: none;
}

.hint a:hover {
  text-decoration: underline;
}

.center {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  text-align: center;
  padding: 28px 18px;
}

.ip-block {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.ip-label,
.timer-label {
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

#clientIp {
  font-size: clamp(22px, 4vw, 32px);
  font-weight: 750;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.timer-block {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

#elapsed {
  font-size: clamp(36px, 7vw, 52px);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.remain {
  font-size: 13px;
  color: var(--muted);
}

.stability-block {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 20px;
  border-radius: 14px;
  border: 1px solid rgba(61, 214, 140, 0.28);
  background: rgba(61, 214, 140, 0.08);
  min-width: 160px;
}

.stability-block[hidden] {
  display: none;
}

.stability-block.is-mid {
  border-color: rgba(240, 163, 94, 0.35);
  background: rgba(240, 163, 94, 0.1);
}

.stability-block.is-low {
  border-color: rgba(255, 107, 107, 0.35);
  background: rgba(255, 107, 107, 0.1);
}

.stability-label {
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

#stabilityPct {
  font-size: clamp(40px, 8vw, 56px);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  color: var(--ok);
  line-height: 1.05;
}

.stability-block.is-mid #stabilityPct { color: var(--warn); }
.stability-block.is-low #stabilityPct { color: var(--danger); }

.btn {
  min-width: 180px;
  min-height: 44px;
  border: 0;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.12s, opacity 0.15s, background 0.15s;
}

.btn:hover { transform: translateY(-1px); }
.btn:disabled { opacity: 0.55; cursor: default; transform: none; }

.btn.primary {
  background: linear-gradient(180deg, var(--accent), #1d92d1);
  color: #fff;
  box-shadow: 0 8px 24px rgba(42, 171, 238, 0.28);
}

.btn.stop {
  background: linear-gradient(180deg, #e54848, #c0392b);
  color: #fff;
  box-shadow: 0 8px 24px rgba(229, 72, 72, 0.25);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  align-items: center;
}

.btn.ghost {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  border: 1px solid var(--line);
  box-shadow: none;
}

.btn.ghost:hover {
  background: rgba(255, 255, 255, 0.1);
}

.btn.ghost[hidden] {
  display: none;
}

.btn.ghost.is-copied {
  border-color: rgba(61, 214, 140, 0.45);
  color: var(--ok);
}

.stats {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  text-align: center;
}

.stat span {
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.stat strong {
  font-size: 18px;
  font-variant-numeric: tabular-nums;
}

.graph-card { overflow: hidden; }

.graph {
  position: relative;
  height: 280px;
  overflow-x: auto;
  overflow-y: hidden;
}

.line {
  position: absolute;
  left: 0;
  right: 0;
  border-top: 1px dashed rgba(255, 255, 255, 0.12);
  pointer-events: none;
}

.line span {
  position: absolute;
  left: 6px;
  top: -10px;
  font-size: 11px;
  color: var(--muted);
}

.line-300 { bottom: 300px; }
.line-200 { bottom: 200px; }
.line-100 { bottom: 100px; }
.line-50 { bottom: 50px; }
.line-0 { bottom: 0; border-top-style: solid; }

.bars {
  position: absolute;
  left: 36px;
  bottom: 0;
  height: 100%;
  display: flex;
  align-items: flex-end;
  gap: 2px;
  min-width: calc(100% - 36px);
}

.bar {
  width: 5px;
  min-height: 2px;
  border-radius: 2px 2px 0 0;
  background: var(--ok);
  flex: 0 0 auto;
}

.bar-green { background: var(--ok); }
.bar-orange { background: var(--warn); }
.bar-red { background: var(--danger); }
.bar-fail { background: rgba(255, 255, 255, 0.25); height: 100% !important; }

@media (max-width: 640px) {
  .stats { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .shell { padding: 14px 12px 28px; }
}