:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface-1: #fcfcfb;
  --text-primary: #0b0b0b;
  --text-secondary: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --baseline: #c3c2b7;
  --border: rgba(11, 11, 11, 0.10);
  --series-1: #2a78d6;
  --status-good: #0ca30c;
  --status-warning: #fab219;
  --status-critical: #d03b3b;
  --accent: #1c5cab;
  --wash: #f0efec;
}
@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --page: #0d0d0d;
    --surface-1: #1a1a19;
    --text-primary: #ffffff;
    --text-secondary: #c3c2b7;
    --muted: #898781;
    --grid: #2c2c2a;
    --baseline: #383835;
    --border: rgba(255, 255, 255, 0.10);
    --series-1: #3987e5;
    --accent: #6da7ec;
    --wash: #232322;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #0d0d0d;
  --surface-1: #1a1a19;
  --text-primary: #ffffff;
  --text-secondary: #c3c2b7;
  --muted: #898781;
  --grid: #2c2c2a;
  --baseline: #383835;
  --border: rgba(255, 255, 255, 0.10);
  --series-1: #3987e5;
  --accent: #6da7ec;
  --wash: #232322;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--page);
  color: var(--text-primary);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", sans-serif;
}
main { max-width: 60rem; margin: 0 auto; padding: 1.5rem 1rem 4rem; }
main.wide { max-width: 72rem; }
a { color: var(--accent); }
h1 { font-size: 1.7rem; line-height: 1.2; margin: .8rem 0 .5rem; }
h2 { font-size: 1.2rem; margin: 2rem 0 .5rem; }
h3 { font-size: 1rem; margin: 1.2rem 0 .3rem; }
.lede { font-size: 1.08rem; color: var(--text-secondary); }
.pill {
  display: inline-block; font-size: .75rem; font-weight: 600;
  letter-spacing: .04em; text-transform: uppercase; color: var(--accent);
  border: 1px solid var(--border); border-radius: 999px;
  padding: .15rem .7rem; margin: 0 0 -.2rem;
}
.callout {
  border: 1px solid var(--border); border-left: 4px solid var(--series-1);
  background: var(--surface-1); border-radius: 6px;
  padding: .8rem 1rem; margin: 1.2rem 0; font-size: .95rem;
}
.callout.calm { border-left-color: var(--status-good); }

nav.site {
  display: flex; flex-wrap: wrap; gap: .3rem 1.1rem; align-items: baseline;
  padding: .8rem 0; border-bottom: 1px solid var(--border); font-size: .92rem;
}
nav.site .brand { font-weight: 700; font-size: 1.02rem; color: var(--text-primary); text-decoration: none; }
nav.site a { text-decoration: none; color: var(--text-secondary); }
nav.site a:hover, nav.site a[aria-current] { color: var(--accent); }

footer {
  border-top: 1px solid var(--border); margin-top: 3rem; padding-top: 1rem;
  font-size: .85rem; color: var(--muted);
}

/* ------------------------------------------------ simulator layout */
.simgrid { display: grid; grid-template-columns: 17rem 1fr; gap: 1.2rem; margin-top: 1rem; }
@media (max-width: 820px) { .simgrid { grid-template-columns: 1fr; } }

fieldset.controls {
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--surface-1); padding: 1rem; margin: 0;
}
fieldset.controls legend { font-weight: 600; font-size: .95rem; padding: 0 .3rem; }
.ctl { margin: .9rem 0; }
.ctl label { display: block; font-size: .88rem; color: var(--text-secondary); margin-bottom: .15rem; }
.ctl output { float: right; font-weight: 600; color: var(--text-primary); font-variant-numeric: tabular-nums; }
.ctl input[type=range] { width: 100%; accent-color: var(--series-1); }
.ctl .hint { font-size: .76rem; color: var(--muted); margin-top: .1rem; }

.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(10.5rem, 1fr)); gap: .8rem; margin: 0 0 1rem; }
.tile {
  background: var(--surface-1); border: 1px solid var(--border);
  border-radius: 8px; padding: .7rem .9rem;
}
.tile .k { font-size: .78rem; color: var(--text-secondary); }
.tile .v { font-size: 1.55rem; font-weight: 700; line-height: 1.25; }
.tile .s { font-size: .76rem; color: var(--muted); }
.tile .v .unit { font-size: .95rem; font-weight: 500; color: var(--text-secondary); }
.tile.status-good .v { color: var(--status-good); }
.tile.status-warning .v { color: inherit; }
.tile.status-critical .v { color: var(--status-critical); }

figure.viz { margin: 0; background: var(--surface-1); border: 1px solid var(--border); border-radius: 8px; padding: .9rem .9rem .4rem; position: relative; }
figure.viz figcaption { font-size: .82rem; color: var(--text-secondary); padding: .4rem .2rem .5rem; }
.viz svg { display: block; width: 100%; height: auto; }
#tooltip {
  position: absolute; pointer-events: none; display: none;
  background: var(--surface-1); border: 1px solid var(--border); border-radius: 6px;
  box-shadow: 0 2px 10px rgba(0,0,0,.15);
  font-size: .8rem; padding: .35rem .6rem; white-space: nowrap; z-index: 5;
}
#tooltip .t { color: var(--text-secondary); }
#tooltip b { font-variant-numeric: tabular-nums; }

table.data { border-collapse: collapse; width: 100%; font-size: .9rem; margin: 1rem 0; }
table.data th, table.data td { text-align: left; padding: .45rem .6rem; border-bottom: 1px solid var(--grid); vertical-align: top; }
table.data th { font-size: .8rem; text-transform: uppercase; letter-spacing: .03em; color: var(--text-secondary); }
table.data td.num { font-variant-numeric: tabular-nums; }
.grade { display: inline-block; font-weight: 700; font-size: .8rem; border-radius: 4px; padding: 0 .45rem; }
.grade.A { background: var(--status-good); color: #fff; }
.grade.D { background: var(--wash); color: var(--text-secondary); border: 1px solid var(--border); }
details.tableview { margin: .6rem 0 1rem; font-size: .85rem; }
details.tableview summary { cursor: pointer; color: var(--text-secondary); }
/* ------------------------------------------------ lead form */
form.leadform { background: var(--surface-1); border: 1px solid var(--border); border-radius: 8px; padding: 1rem 1.1rem; margin: 1rem 0; }
form.leadform h3 { margin: 0 0 .2rem; }
form.leadform .lf-sub { font-size: .88rem; color: var(--text-secondary); margin: 0 0 .8rem; }
.lf-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr)); gap: .7rem; }
form.leadform label { display: block; font-size: .82rem; color: var(--text-secondary); margin-bottom: .6rem; }
form.leadform input, form.leadform textarea {
  display: block; width: 100%; margin-top: .2rem; padding: .45rem .6rem;
  font: inherit; color: var(--text-primary); background: var(--page);
  border: 1px solid var(--border); border-radius: 6px;
}
form.leadform textarea { min-height: 4.5rem; resize: vertical; }
form.leadform .lf-hp { position: absolute; left: -9999px; height: 0; width: 0; opacity: 0; }
form.leadform button {
  font: inherit; font-weight: 600; color: #fff; background: var(--series-1);
  border: 0; border-radius: 6px; padding: .5rem 1.1rem; cursor: pointer;
}
form.leadform button:disabled { opacity: .6; cursor: wait; }
.lf-status { font-size: .88rem; margin: .6rem 0 0; }
.lf-status.ok { color: var(--status-good); font-weight: 600; }
.lf-status.err { color: var(--status-critical); }

.skip { position: absolute; left: -9999px; }
.skip:focus { position: static; }
blockquote { border-left: 3px solid var(--baseline); margin: 1rem 0; padding: .2rem 0 .2rem 1rem; color: var(--text-secondary); font-style: italic; }
code { background: var(--wash); border-radius: 4px; padding: .05rem .3rem; font-size: .9em; }