:root {
  --ink: #1d2a36;
  --muted: #5b6b7a;
  --paper: #eef2f5;
  --card: #ffffff;
  --line: #d5dee6;
  --track: #e2e8ed;
  --blue: #1d5fa8;
  --blue-dark: #174c86;
  --on-blue: #ffffff;
  --sun: #e09a00;
  --sun-band: rgba(224, 154, 0, 0.22);
  --ok: #1f7a4f;
  --ok-soft: #e1f2e8;
  --bad: #b8322a;
  --bad-soft: #fbe6e3;
  --warn: #8f5d00;
  --warn-soft: #fdf0d3;
  --off: #59636e;
  --off-soft: #e6eaee;
  --night: #9aa7b3;
  --radius: 8px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #e3eaf0; --muted: #9aaab8; --paper: #0f1720; --card: #17212c; --line: #2a3744; --track: #253240;
    --blue: #5a9fe4; --blue-dark: #78b2ec; --on-blue: #0b1520; --sun: #f0b22a; --sun-band: rgba(240, 178, 42, 0.2);
    --ok: #4cc38a; --ok-soft: #173327; --bad: #f0786e; --bad-soft: #3a1d1b; --warn: #e9b44c; --warn-soft: #3a2d12;
    --off: #a3afbb; --off-soft: #24303c; --night: #4d5b69; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --ink: #e3eaf0; --muted: #9aaab8; --paper: #0f1720; --card: #17212c; --line: #2a3744; --track: #253240;
  --blue: #5a9fe4; --blue-dark: #78b2ec; --on-blue: #0b1520; --sun: #f0b22a; --sun-band: rgba(240, 178, 42, 0.2);
  --ok: #4cc38a; --ok-soft: #173327; --bad: #f0786e; --bad-soft: #3a1d1b; --warn: #e9b44c; --warn-soft: #3a2d12;
  --off: #a3afbb; --off-soft: #24303c; --night: #4d5b69; color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 400 17px/1.5 "Barlow", "Segoe UI", Helvetica, Arial, sans-serif;
}
a { color: var(--blue); text-underline-offset: 2px; }
a:hover { color: var(--blue-dark); }
:focus-visible { outline: 3px solid var(--sun); outline-offset: 2px; border-radius: 3px; }
h1, h2, h3 { line-height: 1.15; margin: 0 0 0.5em; font-weight: 700; letter-spacing: -0.01em; }
h1 { font-size: 2rem; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.08rem; }
p { margin: 0 0 1em; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
.main { padding-top: 22px; padding-bottom: 48px; min-height: 70vh; }
.muted { color: var(--muted); }
.small { font-size: 0.875rem; }
.num, .lane-read, .stat b { font-family: "Barlow Semi Condensed", "Barlow", sans-serif; font-variant-numeric: tabular-nums; }

/* Header */
.top { background: var(--card); border-bottom: 1px solid var(--line); }
.top-row { display: flex; align-items: center; justify-content: space-between; min-height: 58px; gap: 12px; flex-wrap: wrap; }
.mark { display: inline-flex; align-items: center; gap: 9px; font-weight: 700; font-size: 1.12rem; color: var(--ink); text-decoration: none; }
.mark-sun { width: 16px; height: 16px; border-radius: 50%; background: var(--sun); box-shadow: 0 0 0 3px var(--card), 0 0 0 5px var(--sun); }
.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav a { padding: 7px 10px; border-radius: 6px; text-decoration: none; color: var(--ink); font-weight: 500; }
.nav a[aria-current="page"] { background: var(--paper); box-shadow: inset 0 -2px 0 var(--blue); }
.nav a:hover { background: var(--paper); color: var(--ink); }
.nav .nav-cta { background: var(--blue); color: var(--on-blue); }
.nav .nav-cta:hover { background: var(--blue-dark); color: var(--on-blue); }
.nav-toggle { display: none; }
@media (max-width: 640px) {
  .nav-toggle { display: inline-block; background: none; border: 1px solid var(--line); border-radius: 6px; padding: 6px 12px; font: inherit; color: var(--ink); }
  .nav { display: none; width: 100%; padding-bottom: 10px; }
  .nav.open { display: flex; flex-direction: column; }
}

.foot { border-top: 1px solid var(--line); background: var(--card); font-size: 0.9rem; }
.foot-row { display: flex; gap: 18px; flex-wrap: wrap; padding-top: 16px; padding-bottom: 16px; color: var(--muted); }

/* Buttons and forms */
.btn {
  display: inline-block; border: 0; border-radius: 6px; padding: 10px 16px; background: var(--blue); color: var(--on-blue);
  font: 600 1rem/1.2 "Barlow", sans-serif; text-decoration: none; cursor: pointer;
}
.btn:hover { background: var(--blue-dark); color: var(--on-blue); }
.btn-quiet { background: transparent; color: var(--blue); border: 1.5px solid var(--line); }
.btn-quiet:hover { background: var(--card); color: var(--blue-dark); border-color: var(--blue); }
.btn-danger { background: var(--bad); color: #fff; }
.btn-small { padding: 6px 10px; font-size: 0.9rem; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 8px; }
form.stack { display: grid; gap: 14px; max-width: 460px; }
.field { display: grid; gap: 5px; }
.field > span { font-weight: 600; font-size: 0.95rem; }
.field .hint { font-weight: 400; color: var(--muted); font-size: 0.85rem; }
input[type=text], input[type=email], input[type=password], input[type=tel], input[type=number], input[type=date], input[type=url], select, textarea {
  width: 100%; padding: 10px 12px; border: 1.5px solid var(--line); border-radius: 6px; background: var(--card); color: var(--ink); font: inherit;
}
textarea { min-height: 96px; resize: vertical; }
input:focus, select:focus, textarea:focus { border-color: var(--blue); outline: none; box-shadow: 0 0 0 3px var(--sun-band); }
.check { display: flex; gap: 8px; align-items: flex-start; }
.check input { margin-top: 5px; }
fieldset { border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px 16px; margin: 0; display: grid; gap: 12px; }
legend { font-weight: 700; padding: 0 6px; }
.grid2 { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.flash { padding: 11px 14px; border-radius: var(--radius); margin-bottom: 18px; font-weight: 500; }
.flash-ok { background: var(--ok-soft); color: var(--ok); }
.flash-bad { background: var(--bad-soft); color: var(--bad); }
.flash-info { background: var(--off-soft); color: var(--ink); }

/* Panels */
.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; margin-bottom: 18px; }
.panel > h2:first-child, .panel > h3:first-child { margin-top: 0; }
.page-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; }
.page-head h1 { margin: 0; }

/* System block and the string lanes */
.sys { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px 12px; margin-bottom: 16px; }
.sys-bad { border-left: 4px solid var(--bad); }
.sys-warn { border-left: 4px solid var(--warn); }
.sys-off { border-left: 4px solid var(--off); }
.sys-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.sys-head h2, .sys-head h3 { margin: 0; }
.sys-head a { color: var(--ink); text-decoration: none; }
.sys-head a:hover { text-decoration: underline; }
.sys-meta { color: var(--muted); font-size: 0.9rem; margin: 4px 0 10px; }
.sep { margin: 0 7px; color: var(--line); }
.pill { display: inline-block; padding: 3px 10px; border-radius: 999px; font-weight: 600; font-size: 0.85rem; white-space: nowrap; }
.pill-ok { background: var(--ok-soft); color: var(--ok); }
.pill-bad { background: var(--bad-soft); color: var(--bad); }
.pill-warn { background: var(--warn-soft); color: var(--warn); }
.pill-off { background: var(--off-soft); color: var(--off); }
.pill-info { background: var(--off-soft); color: var(--ink); }

.lanes { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.lane { display: grid; grid-template-columns: 48px 1fr minmax(92px, auto); grid-template-areas: "tag track read" ". note note"; align-items: center; column-gap: 12px; padding: 6px 0; }
.lane-tag {
  grid-area: tag; justify-self: start; font: 700 0.9rem/1 "Barlow Semi Condensed", sans-serif; padding: 4px 6px 3px;
  border: 1.5px solid var(--ink); border-radius: 4px; background: var(--card);
}
.lane-track { grid-area: track; position: relative; height: 14px; background: var(--track); border-radius: 7px; overflow: hidden; }
.lane-band { position: absolute; top: 0; bottom: 0; background: var(--sun-band); border-left: 1.5px solid var(--sun); border-right: 1.5px solid var(--sun); }
.lane-fill { position: absolute; left: 0; top: 3px; bottom: 3px; border-radius: 0 5px 5px 0; background: var(--sun); }
.lane-read { grid-area: read; text-align: right; white-space: nowrap; font-size: 1.05rem; }
.lane-read span { color: var(--muted); margin-left: 8px; font-size: 0.95rem; }
.lane-note { grid-area: note; font-size: 0.85rem; color: var(--muted); margin-top: -2px; }
.lane-down .lane-tag { border-color: var(--bad); color: var(--bad); }
.lane-down .lane-fill { background: var(--bad); }
.lane-down .lane-note { color: var(--bad); font-weight: 600; }
.lane-low .lane-tag { border-color: var(--warn); color: var(--warn); }
.lane-low .lane-fill { background: var(--warn); }
.lane-low .lane-note { color: var(--warn); font-weight: 600; }
.lane-night .lane-fill, .lane-learning .lane-fill { background: var(--night); }
.lane-unused { opacity: 0.6; }
.lane-unused .lane-tag { border-style: dashed; }
.lane-unused .lane-fill { background: var(--night); }

.power { margin: 8px 0 6px; font-size: 0.95rem; color: var(--muted); display: flex; flex-wrap: wrap; align-items: center; row-gap: 4px; }
.power b { color: var(--ink); }
.bat { display: inline-flex; align-items: center; gap: 6px; }
.bat-cell { position: relative; width: 30px; height: 14px; border: 1.5px solid var(--ink); border-radius: 3px; display: inline-block; }
.bat-cell::after { content: ""; position: absolute; right: -4px; top: 3px; width: 2px; height: 5px; background: var(--ink); border-radius: 0 1px 1px 0; }
.bat-cell span { position: absolute; left: 1px; top: 1px; bottom: 1px; max-width: calc(100% - 2px); background: var(--ok); border-radius: 1px; }
.grid-off { color: var(--bad); font-weight: 600; }
.sev { font-size: 0.8rem; font-weight: 700; padding: 2px 8px; border-radius: 999px; white-space: nowrap; }
.sev-critical { background: var(--bad-soft); color: var(--bad); }
.sev-warning { background: var(--warn-soft); color: var(--warn); }
.sev-info { background: var(--off-soft); color: var(--ink); }
.todo { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.todo li { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; display: grid; gap: 6px; }
.todo-head { display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; }

/* Alerts */
.alerts { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.alert { border: 1px solid var(--line); border-left-width: 4px; border-radius: var(--radius); padding: 12px 14px 4px; background: var(--card); }
.alert-bad { border-left-color: var(--bad); }
.alert-good { border-left-color: var(--ok); }
.alert-note { border-left-color: var(--sun); }
.alert-fixed { border-left-color: var(--line); }
.alert-head { display: flex; justify-content: space-between; gap: 10px; align-items: baseline; flex-wrap: wrap; margin-bottom: 4px; }
.alert p { margin-bottom: 8px; }
.tag { font-size: 0.8rem; font-weight: 600; padding: 2px 8px; border-radius: 999px; }
.tag-ok { background: var(--ok-soft); color: var(--ok); }
.tag-bad { background: var(--bad-soft); color: var(--bad); }

/* Tables */
.tbl-wrap { overflow-x: auto; }
table.tbl { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.tbl th, .tbl td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.tbl th { font-weight: 600; color: var(--muted); font-size: 0.85rem; }
.tbl tr:last-child td { border-bottom: 0; }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-bottom: 18px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; }
.stat b { display: block; font-size: 1.8rem; line-height: 1.1; }
.stat span { color: var(--muted); font-size: 0.9rem; }
.stat-bad b { color: var(--bad); }

/* Chart */
.chart { margin: 8px 0 4px; }
.chart svg { width: 100%; height: 160px; display: block; background: var(--paper); border-radius: 6px; }
.ch-grid { stroke: var(--line); }
.ch-line { fill: none; stroke-width: 2; vector-effect: non-scaling-stroke; }
.ch-0 { stroke: var(--sun); color: var(--sun); }
.ch-1 { stroke: var(--blue); color: var(--blue); }
.ch-2 { stroke: var(--ok); color: var(--ok); }
.ch-3 { stroke: var(--bad); color: var(--bad); }
.chart figcaption { display: flex; gap: 14px; flex-wrap: wrap; font-size: 0.85rem; margin-top: 6px; }
.ch-key { font-weight: 600; }
.ch-key::before { content: ""; display: inline-block; width: 14px; height: 3px; background: currentColor; margin-right: 6px; vertical-align: middle; }

/* Landing */
.hero { display: grid; gap: 28px; grid-template-columns: 1fr; align-items: center; padding: 18px 0 28px; }
@media (min-width: 860px) { .hero { grid-template-columns: 1.05fr 0.95fr; padding-top: 34px; } }
.hero h1 { font-size: 2.45rem; max-width: 15ch; }
@media (min-width: 860px) { .hero h1 { font-size: 3rem; } }
.hero .lede { font-size: 1.15rem; max-width: 34em; color: var(--ink); }
.demo .sys { box-shadow: 0 1px 0 var(--line); }
.demo-alert { margin: 8px 0 4px; padding: 10px 12px; border-radius: 6px; background: var(--bad-soft); color: var(--bad); font-size: 0.95rem; }
.steps { counter-reset: s; list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.steps li { counter-increment: s; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
.steps li::before { content: counter(s); display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: var(--blue); color: var(--on-blue); font-weight: 700; margin-bottom: 8px; }
.section { margin: 36px 0; }
.watch { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.watch div { border-top: 3px solid var(--sun); padding-top: 10px; }
.prices { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); max-width: 640px; }
.price { background: var(--card); border: 1.5px solid var(--line); border-radius: var(--radius); padding: 18px; }
.price-best { border-color: var(--blue); }
.price .amt { font: 700 2.2rem/1 "Barlow Semi Condensed", sans-serif; margin: 6px 0 4px; }
.price .per { color: var(--muted); }
.faq dt { font-weight: 700; margin-top: 14px; }
.faq dd { margin: 4px 0 0; max-width: 46em; }
.auth { max-width: 460px; margin: 10px auto; }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }

.netcheck { margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--line); font-size: 0.95rem; }
.netcheck p { margin: 0 0 8px; }
.ok-text { color: var(--ok); font-weight: 600; }
.bad-text { color: var(--bad); font-weight: 600; }
.note-line { margin: 4px 0 8px; padding: 8px 10px; border-radius: var(--radius); background: var(--warn-soft); color: var(--ink); }
.netcheck select { width: auto; max-width: 100%; }