:root {
    color-scheme: light dark;
    --bg: #f6f7f9;
    --panel: #ffffff;
    --border: #e2e5ea;
    --text: #1b1f24;
    --muted: #6b7280;
    --accent: #2563eb;
    --ok: #16a34a;
    --warn: #d97706;
    --down: #dc2626;
    --error: #7c3aed;
    --unknown: #9ca3af;
    --radius: 8px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f1115;
        --panel: #171a21;
        --border: #262b34;
        --text: #e6e8eb;
        --muted: #9aa3af;
        --accent: #60a5fa;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

body.centered {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

main { max-width: 980px; margin: 0 auto; padding: 24px 16px 64px; }

h1 { font-size: 22px; margin: 0 0 4px; }
h2 { font-size: 17px; margin: 28px 0 10px; }
h3 { font-size: 14px; margin: 20px 0 8px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; }

.muted { color: var(--muted); }
.small { font-size: 12px; }
.nowrap { white-space: nowrap; }
.right { margin-left: auto; }
.inline { display: inline; }

/* ---------------------------------------------------------------- topbar */
.topbar {
    display: flex; align-items: center; gap: 20px;
    padding: 12px 16px;
    background: var(--panel);
    border-bottom: 1px solid var(--border);
}
.topbar .brand { font-weight: 700; color: var(--text); }
.topbar nav { display: flex; gap: 16px; }
.topbar form { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.topbar .user { color: var(--muted); font-size: 13px; }

/* ----------------------------------------------------------------- cards */
.cards { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); }

.card {
    display: block;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px;
    color: var(--text);
}
.card:hover { text-decoration: none; border-color: var(--accent); }
.card-down { border-left: 3px solid var(--down); }
.card-head { display: flex; align-items: center; gap: 8px; }

.check-list { list-style: none; margin: 10px 0 0; padding: 0; }
.check-list li { display: flex; align-items: center; gap: 8px; padding: 4px 0; font-size: 13px; }
.check-key { font-weight: 600; }

/* ---------------------------------------------------------------- panels */
.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 16px;
}
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.panel-head h2 { margin: 0; display: flex; align-items: center; gap: 8px; }

.page-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 20px; }
.actions { display: flex; align-items: center; gap: 8px; }

.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin: 14px 0 0; }
.facts dt { font-size: 11px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.facts dd { margin: 2px 0 0; font-size: 14px; }

/* --------------------------------------------------------------- signals */
.dot { width: 9px; height: 9px; border-radius: 50%; display: inline-block; flex: none; }
.dot-ok { background: var(--ok); }
.dot-warn { background: var(--warn); }
.dot-down { background: var(--down); }
.dot-unknown { background: var(--unknown); }

.pill {
    display: inline-block; padding: 1px 7px; border-radius: 999px;
    font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: .03em;
    background: var(--border); color: var(--muted);
}
.pill-ok { background: color-mix(in srgb, var(--ok) 18%, transparent); color: var(--ok); }
.pill-warn { background: color-mix(in srgb, var(--warn) 18%, transparent); color: var(--warn); }
.pill-fail, .pill-down { background: color-mix(in srgb, var(--down) 18%, transparent); color: var(--down); }
.pill-error { background: color-mix(in srgb, var(--error) 18%, transparent); color: var(--error); }
.pill-nodata, .pill-muted { background: var(--border); color: var(--muted); }

/* A compact history strip: one tick per recent result, oldest on the left. */
.sparkbar { display: flex; gap: 2px; align-items: flex-end; height: 26px; margin: 8px 0 4px; }
.tick { width: 6px; height: 100%; border-radius: 2px; background: var(--unknown); }
.tick-ok { background: var(--ok); }
.tick-warn { background: var(--warn); }
.tick-fail { background: var(--down); }
.tick-error { background: var(--error); }
.tick-nodata { background: var(--unknown); }

/* ---------------------------------------------------------------- tables */
.table { width: 100%; border-collapse: collapse; margin-top: 8px; font-size: 13px; }
.table th {
    text-align: left; font-size: 11px; text-transform: uppercase; letter-spacing: .04em;
    color: var(--muted); padding: 6px 8px; border-bottom: 1px solid var(--border);
}
.table td { padding: 7px 8px; border-bottom: 1px solid var(--border); vertical-align: top; }
.table tr:last-child td { border-bottom: 0; }

/* ----------------------------------------------------------------- forms */
form label { display: block; margin: 14px 0 4px; font-size: 13px; font-weight: 600; }
form label.checkbox { display: flex; align-items: center; gap: 8px; font-weight: 500; }
form label.checkbox input { width: auto; margin: 0; }

input[type=text], input[type=email], input[type=password], input[type=number], select {
    width: 100%; padding: 8px 10px;
    border: 1px solid var(--border); border-radius: 6px;
    background: var(--bg); color: var(--text); font: inherit;
}
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

.help { margin: 4px 0 0; font-size: 12px; color: var(--muted); }
.field-error { margin: 4px 0 0; font-size: 12px; color: var(--down); }

.form-narrow { max-width: 520px; background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.form-narrow hr { border: 0; border-top: 1px solid var(--border); margin: 20px 0; }

button, .button {
    display: inline-block; padding: 7px 13px; margin-top: 16px;
    border: 1px solid var(--border); border-radius: 6px;
    background: var(--bg); color: var(--text);
    font: inherit; font-size: 13px; cursor: pointer;
}
.panel-head button, .panel-head .button, .actions button, .actions .button { margin-top: 0; }
button:hover, .button:hover { border-color: var(--accent); text-decoration: none; }
button.primary, .button.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
button.danger, .button.danger { color: var(--down); border-color: color-mix(in srgb, var(--down) 40%, var(--border)); }
button.link { background: none; border: 0; padding: 0; margin: 0; color: var(--accent); font-size: 13px; }

/* -------------------------------------------------------------- uptime % */
.uptime-row { display: flex; gap: 24px; flex-wrap: wrap; margin: 12px 0 4px; }
.uptime-cell { display: flex; flex-direction: column; gap: 1px; }
.uptime-label { font-size: 11px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.uptime-value { font-size: 20px; font-weight: 600; }
.uptime-value.is-good { color: var(--ok); }
.uptime-value.is-warn { color: var(--warn); }
.uptime-value.is-bad { color: var(--down); }

ul.plain { list-style: none; margin: 6px 0; padding: 0; font-size: 13px; }
ul.plain li { padding: 2px 0; }

/* ------------------------------------------------------- core web vitals */
.cwv-grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); margin: 8px 0 4px; }

.cwv-card { border: 1px solid var(--border); border-radius: var(--radius); padding: 12px; }
.cwv-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.cwv-value { font-size: 22px; font-weight: 600; margin: 6px 0 2px; }

/* The sparkline inherits its stroke from the card's assessment colour. */
.cwv-good { color: var(--ok); }
.cwv-needs-improvement { color: var(--warn); }
.cwv-poor { color: var(--down); }
.cwv-unknown { color: var(--unknown); }

.spark { display: block; width: 100%; height: 44px; }

.density { display: flex; height: 5px; border-radius: 3px; overflow: hidden; margin-top: 8px; background: var(--border); }
.density-good { background: var(--ok); }
.density-ni { background: var(--warn); }
.density-poor { background: var(--down); }

.two-col { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }

.domain-picker {
    margin: 8px 0 4px; padding: 10px 12px;
    max-height: 180px; overflow-y: auto;
    border: 1px solid var(--border); border-radius: 6px;
}
.domain-picker .checkbox { margin: 2px 0; font-size: 13px; }

/* ---------------------------------------------------------------- states */
.flash { padding: 10px 14px; border-radius: 6px; margin-bottom: 16px; font-size: 14px; }
.flash-success { background: color-mix(in srgb, var(--ok) 14%, transparent); color: var(--ok); }
.flash-error { background: color-mix(in srgb, var(--down) 14%, transparent); color: var(--down); }

.empty { text-align: center; padding: 48px 16px; color: var(--muted); }

.auth-card {
    width: 340px; padding: 28px;
    background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
}
.auth-card h1 { text-align: center; margin-bottom: 18px; }
.auth-card button { width: 100%; }

/* -------------------------------------------------------- response time */
.latency-summary { display: flex; gap: 18px; flex-wrap: wrap; margin: 6px 0 10px; font-size: 13px; }
.latency-summary strong { font-size: 15px; }

.latency-chart { margin-bottom: 4px; }

.lc-plot { display: flex; align-items: stretch; gap: 6px; }

/* Fixed height at every width: the plot stretches horizontally, so the chart
   stays readable on a phone instead of collapsing with the aspect ratio. */
.lc-plot svg {
    flex: 1 1 auto;
    height: 150px;
    min-width: 0;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
}

.lc-yaxis {
    display: flex; flex-direction: column; justify-content: space-between;
    width: 46px; flex: none; text-align: right;
    font-size: 10px; color: var(--muted); line-height: 1;
    padding: 5px 0;
}

.lc-xaxis {
    position: relative; height: 15px; margin: 4px 0 0 52px;
    font-size: 10px; color: var(--muted);
}
.lc-xaxis span { position: absolute; transform: translateX(-50%); white-space: nowrap; }
.lc-xaxis span:first-child { transform: none; }

/* preserveAspectRatio="none" scales x and y differently, which would thicken
   or thin every stroke; these opt out of that scaling. */
.lc-plot .line {
    fill: none; stroke: var(--accent); stroke-width: 1.75;
    stroke-linejoin: round; stroke-linecap: round;
    vector-effect: non-scaling-stroke;
}
.lc-plot .grid { stroke: var(--border); stroke-width: 1; vector-effect: non-scaling-stroke; }
.lc-plot .failure { fill: var(--down); opacity: .18; }
.lc-plot .hit { fill: transparent; }
.lc-plot .hit:hover { fill: var(--accent); opacity: .1; }

/* Four 12-hour labels collide below ~520px; drop every other one. */
@media (max-width: 520px) {
    .lc-xaxis span:nth-child(even) { display: none; }
}