:root {
  --bg: #EEF1F4; --panel: #FFFFFF; --ink: #16202C; --muted: #5B6878; --line: #CBD3DC;
  --ok: #1F7A50; --warn: #9A6412; --bad: #B4322A; --accent: #2F5D8C; --accent-ink: #FFFFFF;
  --node-bg: #16202C; --node-ink: #EEF1F4;
  --radius-lg: 14px; --radius-sm: 8px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121A23; --panel: #1A2430; --ink: #E6ECF2; --muted: #93A1B1; --line: #2C3A49;
    --ok: #3CCB8A; --warn: #E0A93B; --bad: #F06A5C; --accent: #6FA3D8; --accent-ink: #0E1620;
    --node-bg: #2A3A4C; --node-ink: #E6ECF2;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.5 "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  font-variant-numeric: tabular-nums;
}
.wrap { max-width: 1120px; margin: 0 auto; padding: 20px 24px 48px; }

h1 { font-size: 34px; line-height: 1.1; margin: 0 0 6px; font-weight: 650; letter-spacing: -0.01em; }
h2 { font-size: 17px; margin: 0 0 4px; font-weight: 620; }
h3 { font-size: 18px; margin: 0; font-weight: 620; }
p { margin: 0; }
.muted { color: var(--muted); }

.bar { display: flex; justify-content: flex-end; align-items: center; gap: 12px; color: var(--muted); font-size: 14px; margin-bottom: 16px; }
.bar form { margin: 0; }
.top { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; flex-wrap: wrap; margin-bottom: 24px; }
.refresh { display: flex; align-items: center; gap: 12px; font-size: 14px; }

/* Buttons and button-looking links */
button, .btn {
  display: inline-block; font: inherit; font-weight: 600; text-decoration: none; cursor: pointer;
  border-radius: var(--radius-sm); padding: 8px 14px; line-height: 1.4;
  border: 1px solid var(--accent); background: var(--accent); color: var(--accent-ink);
}
.btn.ghost, button.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.danger, button.danger { background: transparent; color: var(--bad); border-color: var(--bad); }
.btn.disabled { opacity: .45; cursor: not-allowed; }
button.link { background: none; border: 0; padding: 0; color: var(--accent); font-weight: 600; text-decoration: underline; }
button:focus-visible, .btn:focus-visible, input:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

/* Messages */
.flash { padding: 10px 14px; border-radius: var(--radius-sm); border: 1px solid; margin: 0 0 12px; background: var(--panel); }
.flash.ok { border-color: var(--ok); color: var(--ok); }
.flash.bad { border-color: var(--bad); color: var(--bad); }

/* Confirmation and move-in-progress panels */
.confirm, .move {
  background: var(--panel); border: 2px solid var(--accent); border-radius: var(--radius-lg);
  padding: 18px 20px; margin-bottom: 24px;
}
.confirm p, .move p { margin: 6px 0 14px; }
.confirm.danger { border-color: var(--bad); }
.move { border-color: var(--warn); }

/* Topology: the wires show whether traffic can reach each server */
.topology {
  display: grid; grid-template-columns: minmax(200px, 240px) 1fr minmax(290px, 360px);
  grid-template-rows: auto auto; row-gap: 22px; align-items: center; margin-bottom: 28px;
}
.lbnode { grid-column: 1; grid-row: 1 / span 2; background: var(--node-bg); color: var(--node-ink); border-radius: var(--radius-lg); padding: 20px; }
.lbnode h2 { font-size: 20px; }
.lbnode p { margin-top: 4px; opacity: .85; font-size: 14px; }

.wire { grid-column: 2; position: relative; height: 44px; }
.wire.r1 { grid-row: 1; } .wire.r2 { grid-row: 2; }
.wire::before { content: ""; position: absolute; left: 0; right: 0; top: 50%; border-top: 3px dashed var(--line); }
.wire span {
  position: absolute; left: 50%; top: 0; transform: translateX(-50%);
  font-size: 13px; color: var(--muted); background: var(--bg); padding: 0 8px; white-space: nowrap;
}
.wire.healthy::before { border-top: 3px solid var(--ok); }
.wire.healthy::after {
  content: ""; position: absolute; left: 0; right: 0; top: calc(50% - 3px); height: 9px;
  background: radial-gradient(circle, var(--ok) 3px, transparent 4px) 0 0 / 28px 9px repeat-x;
  animation: flow 1.1s linear infinite;
}
.wire.healthy span { color: var(--ok); }
.wire.pending::before { border-top-color: var(--warn); }
.wire.pending span { color: var(--warn); }
.wire.unhealthy::before { border-top: 3px solid var(--bad); }
.wire.unhealthy span { color: var(--bad); }
@keyframes flow { to { background-position: 28px 0; } }
@media (prefers-reduced-motion: reduce) { .wire.healthy::after { animation: none; } }

.srv { grid-column: 3; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 18px 20px; }
.srv.r1 { grid-row: 1; } .srv.r2 { grid-row: 2; }
.srv.detached { border-style: dashed; }
.srv .head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.state { font-weight: 600; font-size: 14px; white-space: nowrap; }
.s-healthy { color: var(--ok); } .s-pending { color: var(--warn); } .s-unhealthy { color: var(--bad); } .s-detached { color: var(--muted); }
dl { display: grid; grid-template-columns: auto 1fr; gap: 2px 16px; margin: 12px 0 14px; font-size: 14px; }
dt { color: var(--muted); } dd { margin: 0; }
dd.good { color: var(--ok); } dd.bad { color: var(--bad); }
.hint { font-size: 13px; color: var(--muted); margin-top: 8px; }

/* Lower panels */
.lower { display: grid; grid-template-columns: 1fr 1.3fr; gap: 20px; align-items: start; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 18px 20px; }
.panel > .muted { margin-bottom: 12px; }
.probe { margin-top: 14px; }
.log { list-style: none; margin: 0; padding: 0; max-height: 300px; overflow: auto; font-size: 14px; }
.log li { padding: 7px 0; border-top: 1px solid var(--line); display: grid; grid-template-columns: 96px 1fr; gap: 10px; }
.log li:first-child { border-top: 0; }
.log time { color: var(--muted); }
.log .bad { color: var(--bad); }

/* Login */
.login { max-width: 380px; margin: 12vh auto 0; }
.login h1 { font-size: 28px; }
.login > .muted { margin-bottom: 20px; }
.stack { display: grid; gap: 14px; }
.stack label { display: grid; gap: 6px; font-weight: 600; font-size: 14px; }
.stack input {
  font: inherit; padding: 9px 12px; border-radius: var(--radius-sm);
  border: 1px solid var(--line); background: var(--panel); color: var(--ink);
}

/* Small screens: stack everything, wires turn vertical */
@media (max-width: 760px) {
  .topology { grid-template-columns: 1fr; grid-template-rows: none; row-gap: 0; }
  .topology > .lbnode, .topology > .wire[class], .topology > .srv[class] { grid-column: 1; grid-row: auto; }
  .wire { height: 56px; }
  .wire::before { left: 50%; right: auto; top: 0; bottom: 0; border-top: 0; border-left: 3px dashed var(--line); }
  .wire.healthy::before { border-left: 3px solid var(--ok); }
  .wire.pending::before { border-left-color: var(--warn); }
  .wire.unhealthy::before { border-left: 3px solid var(--bad); }
  .wire.healthy::after { display: none; }
  .wire span { left: calc(50% + 14px); top: 50%; transform: translateY(-50%); background: transparent; padding: 0; }
  .lower { grid-template-columns: 1fr; }
}