/* Strip-chart recorder look: the live trace is the centrepiece, everything else stays quiet. */
:root {
  --paper: #eef1f3;
  --panel: #f8fafb;
  --ink: #13202c;
  --muted: #5b6b78;
  --grid: #cdd6dd;
  --line: #d5dde3;
  --download: #0a6c8f;
  --upload: #a8307f;
  --warn: #9a5b00;
  --danger: #b3261e;
  --focus: #1a73e8;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0f171f;
    --panel: #15202a;
    --ink: #e6edf2;
    --muted: #92a3b1;
    --grid: #263644;
    --line: #243240;
    --download: #4cc2e8;
    --upload: #ec7cc2;
    --warn: #e0a64a;
    --danger: #ff8a80;
    --focus: #7fb2ff;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.5 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.page { max-width: 880px; margin: 0 auto; padding: 24px 20px 48px; }

h1 { margin: 0; font-size: 1.35rem; font-weight: 650; letter-spacing: -0.01em; }
h2 { margin: 0 0 10px; font-size: 1rem; font-weight: 600; }

a { color: inherit; }
.quiet { color: var(--muted); text-decoration: none; font-size: 0.95rem; }
.quiet:hover { color: var(--ink); text-decoration: underline; }
.muted { color: var(--muted); }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

.top { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 28px; }

/* Server picker */
.servers { margin-bottom: 20px; }
.server-list { display: flex; flex-wrap: wrap; gap: 8px; }
.server {
  appearance: none;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-width: 150px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.server[aria-checked="true"] { border-color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }
.server[disabled] { cursor: not-allowed; opacity: 0.55; }
.server-name { font-weight: 600; }
.server-meta { font-size: 0.85rem; color: var(--muted); }
.server-meta.bad { color: var(--danger); }

/* Recorder */
.recorder {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  overflow: hidden;
}
.trace { display: block; width: 100%; height: 300px; }
.readout { position: absolute; top: 18px; left: 22px; pointer-events: none; }
.speed { display: flex; align-items: baseline; gap: 10px; }
#speed {
  font-size: clamp(3rem, 11vw, 5.5rem);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.speed .unit { font-size: 1.1rem; color: var(--muted); }
.phase { margin-top: 6px; color: var(--muted); }
.recorder[data-phase="download"] #speed { color: var(--download); }
.recorder[data-phase="upload"] #speed { color: var(--upload); }
.bar { height: 4px; background: var(--line); }
.bar span { display: block; width: 0; height: 100%; background: var(--ink); transition: width 0.1s linear; }
.recorder[data-phase="download"] .bar span { background: var(--download); }
.recorder[data-phase="upload"] .bar span { background: var(--upload); }

/* Controls */
.controls { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 12px; margin: 18px 0; }
button { font: inherit; }
.primary, .secondary {
  min-height: 44px;
  padding: 0 28px;
  border-radius: 6px;
  border: 1px solid var(--ink);
  cursor: pointer;
  font-weight: 600;
}
.primary { background: var(--ink); color: var(--paper); }
.primary[disabled] { opacity: 0.45; cursor: not-allowed; }
.secondary { background: transparent; color: var(--ink); }
.settings { margin-left: auto; color: var(--muted); }
.settings summary { cursor: pointer; min-height: 44px; display: flex; align-items: center; }
.settings-grid { display: grid; gap: 12px; padding: 4px 0 8px; }
.settings label { display: grid; gap: 4px; font-size: 0.9rem; }
select, input[type="text"], input[type="url"], input[type="password"] {
  font: inherit;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  color: var(--ink);
}

.error {
  margin: 0 0 18px;
  padding: 10px 14px;
  border: 1px solid var(--danger);
  border-radius: 6px;
  color: var(--danger);
}

/* Results */
.results { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 36px; }
.card { padding: 14px 16px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); }
.card.active { border-color: var(--ink); }
.card-label { color: var(--muted); font-size: 0.9rem; }
.card-value { font-size: 1.9rem; font-weight: 400; font-variant-numeric: tabular-nums; letter-spacing: -0.02em; }
.card.download .card-value span:first-child { color: var(--download); }
.card.upload .card-value span:first-child { color: var(--upload); }
.card-value .unit { font-size: 0.9rem; color: var(--muted); letter-spacing: 0; }
.card-note { min-height: 1.3em; font-size: 0.82rem; color: var(--muted); }
.card-note.warn { color: var(--warn); }

/* History */
.history-head { display: flex; align-items: baseline; justify-content: space-between; }
.quiet-button { background: none; border: 0; color: var(--muted); cursor: pointer; padding: 6px 0; }
.quiet-button:hover { color: var(--ink); text-decoration: underline; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.92rem; font-variant-numeric: tabular-nums; }
th, td { padding: 8px 10px 8px 0; text-align: left; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { color: var(--muted); font-weight: 500; }

.foot { display: flex; justify-content: space-between; margin-top: 40px; font-size: 0.85rem; }

@media (max-width: 640px) {
  .results { grid-template-columns: repeat(2, 1fr); }
  .trace { height: 240px; }
  .settings { margin-left: 0; width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  .bar span { transition: none; }
}

/* Admin */
.admin-card { padding: 18px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); margin-bottom: 24px; }
.admin-card h2 { margin-bottom: 14px; }
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px 16px; }
.form-grid label { display: grid; gap: 4px; font-size: 0.9rem; }
.form-grid .wide { grid-column: 1 / -1; }
.field-hint { font-size: 0.82rem; color: var(--muted); }
.row { display: flex; gap: 8px; }
.row input { flex: 1; min-width: 0; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; align-items: center; }
.btn {
  min-height: 40px;
  padding: 0 16px;
  border-radius: 6px;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  font-weight: 600;
}
.btn.solid { background: var(--ink); color: var(--paper); }
.btn.small { min-height: 34px; padding: 0 12px; font-weight: 500; }
.btn.danger { border-color: var(--danger); color: var(--danger); }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; }
.status { font-size: 0.88rem; }
.status.ok { color: var(--download); }
.status.bad { color: var(--danger); }
.status.warn { color: var(--warn); }
.checkbox { display: flex !important; grid-template-columns: none !important; align-items: center; gap: 8px !important; }
.server-table td { vertical-align: top; }
.server-table .cell-actions { display: flex; flex-wrap: wrap; gap: 6px; }
.server-table td.wrap { white-space: normal; word-break: break-word; }
.notice { margin: 0 0 14px; }

@media (max-width: 640px) {
  .form-grid { grid-template-columns: 1fr; }
}