:root {
  --bg: #000;
  --fg: #d9d9d9;
  --dim: #7c7c7c;
  --line: #d9d9d9;
  --ok: #3cff7a;
  --warn: #ffd23c;
  --err: #ff4a4a;
  --font: "IBM Plex Mono", "JetBrains Mono", Consolas, "DejaVu Sans Mono", monospace;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.5 var(--font);
  -webkit-font-smoothing: antialiased;
}

pre { margin: 0; font: inherit; white-space: pre-wrap; word-break: break-word; }

.ok { color: var(--ok); }
.warn { color: var(--warn); }
.err { color: var(--err); }
.dim { color: var(--dim); }

::selection { background: var(--ok); color: #000; }

/* ---- frames ---- */

.frame {
  position: relative;
  border: 1px solid var(--line);
  padding: 22px 16px 14px;
  min-width: 0;
}

.frame-title {
  position: absolute;
  top: -0.8em;
  left: 12px;
  padding: 0 8px;
  background: var(--bg);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
}

/* ---- buttons & inputs ---- */

.btn {
  font: inherit;
  color: var(--fg);
  background: transparent;
  border: 1px solid var(--line);
  padding: 8px 14px;
  cursor: pointer;
  letter-spacing: 0.08em;
}

.btn:hover:not(:disabled), .btn:focus-visible {
  background: var(--fg);
  color: var(--bg);
  outline: none;
}

.btn:disabled { cursor: default; color: var(--dim); border-color: var(--dim); }
.btn-small { padding: 2px 8px; font-size: 13px; }

.btn-big {
  font-size: 22px;
  font-weight: 600;
  padding: 14px 36px;
  border: 2px solid var(--ok);
  color: var(--ok);
}

.btn-big:hover:not(:disabled), .btn-big:focus-visible { background: var(--ok); color: var(--bg); }
.btn-big.btn-done:disabled { color: var(--ok); border-color: var(--ok); }

.btn-danger { border-color: var(--err); color: var(--err); }
.btn-danger:hover:not(:disabled), .btn-danger:focus-visible { background: var(--err); color: var(--bg); }

input {
  font: inherit;
  color: var(--ok);
  background: transparent;
  border: none;
  border-bottom: 1px dashed var(--dim);
  padding: 2px 4px;
  flex: 1;
  min-width: 0;
  caret-color: var(--ok);
  border-radius: 0;
}

input:focus { outline: none; border-bottom-color: var(--ok); }

/* ---- login ---- */

.login-wrap {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 24px 16px;
}

.login-frame { width: min(560px, 100%); }
.boot { color: var(--fg); min-height: 1.5em; margin-bottom: 14px; }
.boot .sep { border-top: 1px dashed var(--dim); margin: 6px 0; }
.leaders li, .leader { display: flex; align-items: baseline; gap: 6px; }
.leaders .fill, .leader .fill {
  flex: 1;
  min-width: 12px;
  border-bottom: 2px dotted var(--dim);
  transform: translateY(-4px);
}
.login-form { display: grid; gap: 10px; margin-top: 4px; }
.prompt-line { display: flex; align-items: baseline; gap: 10px; }
.prompt { color: var(--fg); white-space: nowrap; }
.login-form .btn { justify-self: start; margin-top: 8px; }
.out { margin-top: 12px; min-height: 1.5em; }

/* ---- device ---- */

.topbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 8px 16px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}

.topbar-id { display: flex; flex-wrap: wrap; gap: 4px 14px; align-items: baseline; }
.topbar-id strong { font-size: 18px; letter-spacing: 0.1em; color: var(--ok); }
.topbar-right { display: flex; gap: 14px; align-items: center; }

.grid {
  display: grid;
  gap: 26px 18px;
  padding: 30px 16px 16px;
  max-width: 1200px;
  margin: 0 auto;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-areas:
    "status   telemetry diag"
    "power    telemetry diag"
    "power    log       log"
    "activate activate  activate";
}

.area-status { grid-area: status; }
.area-power { grid-area: power; }
.area-telemetry { grid-area: telemetry; }
.area-diag { grid-area: diag; }
.area-log { grid-area: log; }
.area-activate { grid-area: activate; }

.status-big {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 28px;
  font-weight: 600;
  letter-spacing: 0.14em;
  margin-bottom: 10px;
}

.dot { width: 14px; height: 14px; display: inline-block; flex: none; }
.dot-ok { background: var(--ok); }
.dot-warn { background: var(--warn); animation: blink 1.2s steps(1) infinite; }

@keyframes blink { 50% { opacity: 0.15; } }

.kv {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 14px;
  margin: 0;
}

.kv dt { color: var(--dim); }
.kv dd { margin: 0; text-align: right; font-variant-numeric: tabular-nums; }
.kv-wide { gap: 8px 14px; }

.power-row { margin-bottom: 14px; }
.power-row:last-child { margin-bottom: 0; }
.power-head { display: flex; justify-content: space-between; }
.meter {
  height: 12px;
  margin: 4px 0 2px;
  border: 1px solid var(--fg);
  padding: 1px;
  background: repeating-linear-gradient(90deg, #2a2a2a 0 2px, transparent 2px 5px) content-box;
}
.meter-fill { height: 100%; background: var(--fg); }
.meter-warn { border-color: var(--warn); }
.meter-warn .meter-fill { background: var(--warn); }

.leaders { list-style: none; margin: 0; padding: 0; }

.log { height: 168px; overflow-y: auto; color: var(--fg); scrollbar-width: thin; scrollbar-color: var(--dim) transparent; }

.area-activate { border-color: var(--ok); text-align: center; padding: 26px 16px 20px; }
.act-hint { margin: 0 0 18px; color: var(--warn); }
.act-hint.ok { color: var(--ok); }
.act-controls { display: grid; justify-items: center; gap: 12px; }
.act-confirm p { margin: 0 0 12px; }
.act-choices { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.area-activate .out { text-align: left; display: inline-block; max-width: 100%; margin-top: 18px; }
.area-activate .out:empty { display: none; }

.footer { padding: 8px 16px 20px; text-align: center; font-size: 12px; letter-spacing: 0.1em; }

/* ---- narrow screens ---- */

@media (max-width: 900px) {
  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-template-areas:
      "status    power"
      "telemetry diag"
      "log       log"
      "activate  activate";
  }
}

@media (max-width: 600px) {
  html, body { font-size: 14px; }
  input { font-size: 16px; } /* below 16px iOS zooms the page on focus */
  .login-wrap { place-items: start center; padding-top: 32px; }
  .prompt-line { flex-direction: column; align-items: stretch; gap: 4px; }
  .login-form .btn { justify-self: stretch; }
  .topbar-right { width: 100%; justify-content: space-between; }
  .grid {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "status" "activate" "power" "telemetry" "diag" "log";
  }
  .status-big { font-size: 22px; }
  .btn-big { font-size: 18px; padding: 12px 22px; width: 100%; }
  .leaders li { font-size: 13px; }
}

@media (prefers-reduced-motion: reduce) {
  .dot-warn { animation: none; }
}