:root {
  --bg: #0b1020;
  --bg2: #121a33;
  --line: #24304f;
  --text: #e6ebf5;
  --muted: #8d98b3;
  --dl: #22d3ee;
  --ul: #a78bfa;
  --accent: #22d3ee;
  --err: #f87171;
  --radius: 14px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: radial-gradient(1200px 600px at 50% -10%, #1a2550 0%, var(--bg) 60%) fixed, var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex; flex-direction: column;
}
a { color: var(--accent); }
.hidden { display: none !important; }

.top {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px 24px;
  padding: 16px max(16px, env(safe-area-inset-left)); max-width: 1000px; width: 100%; margin: 0 auto;
}
.brand { color: var(--text); text-decoration: none; font-weight: 700; font-size: 1.25rem; letter-spacing: .02em; }
.brand-mark {
  background: linear-gradient(135deg, var(--dl), var(--ul)); color: #0b1020;
  padding: 2px 8px; border-radius: 6px; margin-right: 4px;
}
.meta { display: flex; gap: 20px; flex-wrap: wrap; font-size: .9rem; }
.label { color: var(--muted); margin-right: 4px; text-transform: uppercase; font-size: .72rem; letter-spacing: .08em; }

main { flex: 1; width: 100%; max-width: 1000px; margin: 0 auto; padding: 0 16px 32px; }

.gauge-wrap { position: relative; max-width: 460px; margin: 8px auto 0; text-align: center; }
.gauge { width: 100%; height: auto; display: block; }
.arc-bg { fill: none; stroke: var(--line); stroke-width: 16; stroke-linecap: round; }
.arc-fg { fill: none; stroke: url(#arcGrad); stroke-width: 16; stroke-linecap: round;
  stroke-dasharray: 0 100; transition: stroke-dasharray .15s linear; }
.tick { fill: var(--muted); font-size: 11px; text-anchor: middle; }
.needle { stroke: var(--text); stroke-width: 4; stroke-linecap: round; transition: transform .15s linear; }
.hub { fill: var(--text); }

.dial { position: relative; }
.readout { position: absolute; left: 0; right: 0; top: 66%; pointer-events: none; }
.value { font-size: clamp(2.4rem, 9vw, 3.6rem); font-weight: 700; font-variant-numeric: tabular-nums; line-height: 1; }
.unit { color: var(--muted); font-size: .95rem; margin-top: 4px; }
.phase { color: var(--accent); font-size: .85rem; text-transform: uppercase; letter-spacing: .12em; margin-top: 6px; }

.go {
  margin: 36px auto 0; display: block;
  width: 132px; height: 132px; border-radius: 50%;
  border: 3px solid var(--dl); background: rgba(34, 211, 238, .08);
  color: var(--text); font-size: 1.4rem; font-weight: 700; letter-spacing: .1em; cursor: pointer;
  box-shadow: 0 0 0 0 rgba(34, 211, 238, .5); animation: pulse 2.4s infinite;
  transition: background .2s, transform .1s;
}
.go:hover { background: rgba(34, 211, 238, .18); }
.go:active { transform: scale(.97); }
.go:focus-visible { outline: 3px solid var(--ul); outline-offset: 4px; }
body.running .go { width: 88px; height: 88px; font-size: 1rem; animation: none; border-color: var(--muted); }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(34,211,238,.45); } 70% { box-shadow: 0 0 0 22px rgba(34,211,238,0); } 100% { box-shadow: 0 0 0 0 rgba(34,211,238,0); } }
@media (prefers-reduced-motion: reduce) { .go { animation: none; } .arc-fg, .needle { transition: none; } }

.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 28px; }
.card { background: var(--bg2); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; transition: border-color .2s; }
.card .k { color: var(--muted); font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; }
.card .v { font-size: 1.6rem; font-weight: 700; margin-top: 6px; font-variant-numeric: tabular-nums; }
.card .v small { font-size: .8rem; color: var(--muted); font-weight: 400; }
.card.active { border-color: var(--accent); }
.card.dl .k { color: var(--dl); }
.card.ul .k { color: var(--ul); }
.card.ul.active { border-color: var(--ul); }

.result { text-align: center; margin-top: 20px; }
.result strong { font-family: ui-monospace, Menlo, monospace; font-size: 1.15rem; letter-spacing: .08em; }
.hint, .small { color: var(--muted); font-size: .85rem; }
.error { color: var(--err); }
.link { background: none; border: 0; color: var(--accent); cursor: pointer; font: inherit; text-decoration: underline; margin-left: 8px; }

.history, .tips { margin-top: 32px; }
h2 { font-size: 1rem; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; font-weight: 600; }
table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); font-size: .9rem; }
th { color: var(--muted); font-weight: 500; }
.tips ul { color: var(--muted); line-height: 1.7; padding-left: 20px; }

.foot { border-top: 1px solid var(--line); padding: 18px 16px; text-align: center; color: var(--muted); font-size: .85rem; }
.foot p { max-width: 760px; margin: 6px auto; }

/* Result page / privacy page */
.page { max-width: 760px; margin: 0 auto; padding: 0 16px 40px; line-height: 1.6; }
.page h1 { font-size: 1.6rem; }
.page .cards { grid-template-columns: repeat(2, 1fr); }

@media (max-width: 640px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .card .v { font-size: 1.3rem; }
  .meta { gap: 12px; }
  .history th:nth-child(5), .history td:nth-child(5) { display: none; }
}

.back { margin-top: 24px; }

/* Admin */
.admin { max-width: 1400px; margin: 0 auto; padding: 0 16px 40px; }
.admin form.filters { display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: end; margin: 8px 0 16px; }
.admin label { display: flex; flex-direction: column; font-size: .75rem; color: var(--muted); gap: 4px; }
.admin input, .admin select, .admin button, .login input, .login button {
  background: var(--bg2); color: var(--text); border: 1px solid var(--line); border-radius: 8px; padding: 7px 10px; font: inherit; font-size: .9rem;
}
.admin button, .login button { background: var(--accent); color: #0b1020; border-color: var(--accent); font-weight: 600; cursor: pointer; }
.admin .btn2 { background: transparent; color: var(--accent); }
.admin .stats { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 16px; }
.admin .stats div { background: var(--bg2); border: 1px solid var(--line); border-radius: 10px; padding: 8px 14px; font-size: .85rem; }
.admin .stats b { display: block; font-size: 1.1rem; }
.admin .tbl { overflow-x: auto; }
.admin td, .admin th { white-space: nowrap; font-size: .85rem; }
.admin td.ua { max-width: 280px; overflow: hidden; text-overflow: ellipsis; color: var(--muted); }
.admin td.num { text-align: right; }
.admin .pager { display: flex; gap: 12px; align-items: center; margin-top: 12px; }
.admin .bar { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; }
.tag { font-size: .7rem; padding: 1px 6px; border-radius: 4px; background: rgba(34,211,238,.15); color: var(--accent); }
.login { max-width: 340px; margin: 60px auto; padding: 0 16px; display: flex; flex-direction: column; gap: 12px; }