:root {
  --bg: #eef3f6;
  --surface: #ffffff;
  --ink: #1a2b36;
  --muted: #5b7383;
  --accent: #2c5f7c;
  --accent-2: #3d7ea6;
  --danger: #a33b3b;
  --ok: #2f6b4f;
  --border: #c9d7e0;
  --unit: #d9e4eb;
  --occupied: #b7d2e3;
  --font: "Segoe UI", "Trebuchet MS", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    linear-gradient(180deg, #dce8ef 0%, var(--bg) 220px),
    repeating-linear-gradient(90deg, transparent, transparent 24px, rgba(44,95,124,.03) 24px, rgba(44,95,124,.03) 25px);
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 1.5rem;
  background: linear-gradient(90deg, #1f4458, #2c5f7c);
  color: #fff;
}
.topbar a { color: #fff; }
.brand a { font-weight: 700; font-size: 1.1rem; text-decoration: none; }
.brand .ver { opacity: .7; font-weight: 500; font-size: .85rem; }
.nav { display: flex; gap: 1rem; flex-wrap: wrap; }
.container { max-width: 1100px; margin: 1.5rem auto; padding: 0 1rem 3rem; }
.page-head { display: flex; justify-content: space-between; gap: 1rem; align-items: flex-start; flex-wrap: wrap; margin-bottom: 1rem; }
.actions { display: flex; gap: .5rem; flex-wrap: wrap; }
.back { display: inline-block; margin-bottom: .4rem; color: var(--muted); }

h1 { margin: 0 0 .4rem; font-size: 1.7rem; }
h2 { margin: 0 0 .75rem; font-size: 1.15rem; }
.muted { color: var(--muted); }
.panel, .auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
}
.auth-card { max-width: 420px; margin: 3rem auto; }
.narrow { max-width: 640px; }
label { display: block; margin-bottom: .9rem; font-weight: 600; }
input, select, button, textarea {
  font: inherit;
  width: 100%;
  margin-top: .35rem;
  padding: .55rem .65rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
}
button, .btn {
  display: inline-block;
  width: auto;
  cursor: pointer;
  border: 1px solid var(--border);
  background: #f4f8fb;
  color: var(--ink);
  padding: .55rem .9rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
}
.btn:hover, button:hover { filter: brightness(.97); text-decoration: none; }
.btn.primary, button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.alert { padding: .75rem 1rem; border-radius: 8px; margin-bottom: 1rem; }
.alert-error { background: #f8e6e6; color: var(--danger); }
.alert-success, .alert-ok { background: #e5f4ec; color: var(--ok); }
.hidden { display: none !important; }

.dc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
}
.dc-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  text-align: center;
  color: inherit;
  transition: transform .15s ease, box-shadow .15s ease;
}
.dc-card:hover { transform: translateY(-3px); box-shadow: 0 8px 20px rgba(30,60,80,.12); text-decoration: none; }
.dc-icon { width: 88px; height: 88px; }
.dc-name { font-weight: 700; margin-top: .4rem; }
.dc-address, .dc-meta { color: var(--muted); font-size: .9rem; margin-top: .2rem; }

.rack-list { display: grid; gap: .75rem; }
.rack-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  color: inherit;
}
.rack-card:hover { border-color: var(--accent-2); text-decoration: none; }
.rack-card-title { font-weight: 700; font-size: 1.1rem; }
.power-block {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem 1.25rem;
  margin-top: .65rem;
  padding: .65rem .8rem;
  background: #f3f8fb;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.power-block.large { margin: 0 0 1rem; font-size: 1.05rem; }

.rack-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 1.25rem;
  align-items: start;
}
@media (max-width: 860px) {
  .rack-layout { grid-template-columns: 1fr; }
}
.rack-schema {
  background: #1f4458;
  border-radius: 12px;
  padding: .75rem;
  border: 2px solid #163445;
}
.unit-row {
  display: grid;
  grid-template-columns: 1fr 42px;
  gap: .4rem;
  margin-bottom: 2px;
  min-height: 28px;
}
.unit-cell {
  background: var(--unit);
  border-radius: 4px;
  padding: .2rem .45rem;
  font-size: .85rem;
  display: flex;
  align-items: center;
}
.unit-row.occupied .unit-cell { background: var(--occupied); }
.unit-row.eq-mid .unit-cell { background: #a9c8db; border-top: none; }
.unit-cell .empty { color: #6d8797; font-size: .8rem; }
.unit-cell a { color: var(--ink); font-weight: 600; display: flex; flex-direction: column; }
.unit-num {
  color: #d7e8f2;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .85rem;
}
.side-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
}
.xc-list { list-style: none; padding: 0; margin: 0; }
.xc-list li { padding: .45rem 0; border-bottom: 1px solid var(--border); }
.table { width: 100%; border-collapse: collapse; background: var(--surface); }
.table th, .table td { border: 1px solid var(--border); padding: .5rem .6rem; text-align: left; vertical-align: top; }
.table th { background: #e8f0f5; }
.badge {
  display: inline-block;
  margin-left: .35rem;
  padding: .1rem .35rem;
  border-radius: 999px;
  background: #e7f0f6;
  color: var(--accent);
  font-size: .75rem;
}
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 700px) { .grid-2 { grid-template-columns: 1fr; } }
.admin-grid { display: grid; gap: .75rem; max-width: 420px; }
.admin-grid .btn { text-align: center; }
.info-box {
  background: #f3f8fb;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: .75rem;
  margin-bottom: 1rem;
}
.toggle-row { display: flex; gap: 1rem; margin-bottom: 1rem; flex-wrap: wrap; }
.toggle-row label { font-weight: 600; display: flex; align-items: center; gap: .35rem; }
.toggle-row input { width: auto; margin: 0; }
.numbering-fieldset {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: .75rem 1rem 0.25rem;
  margin: 0 0 1rem;
}
.numbering-fieldset legend { padding: 0 .35rem; font-weight: 700; }
.slot-panel { margin-bottom: 1rem; }
.slot-panel h2 { margin-top: 0; }
.slot-panel { margin-bottom: 1rem; }
.slot-panel h2 { margin-top: 0; }
.remap-box { margin: .75rem 0; padding: .75rem; background: #fff8e8; border: 1px solid #e0c989; border-radius: 8px; }
.remap-box h3 { margin: 0 0 .5rem; font-size: 1rem; }
.plan-output pre {
  white-space: pre-wrap;
  word-break: break-word;
  background: #f7fafc;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  margin: 0;
  font-family: Consolas, "Courier New", monospace;
  font-size: .92rem;
  line-height: 1.45;
  max-height: 70vh;
  overflow: auto;
}
.mode-table { font-size: .88rem; margin-top: .75rem; }
.mode-table select { margin-top: 0; }
.mode-notes { margin: .5rem 0 0.75rem 1.1rem; }
.ok-box { background: #e5f4ec; color: var(--ok); }
#port-modes-box { margin-bottom: 1rem; }
#port-modes-box h3 { margin: 0 0 .5rem; }

.confirm-panel .confirm-challenge {
  margin: 1.25rem 0;
  padding: 1rem;
  text-align: center;
  background: #f7fafc;
  border: 1px dashed var(--border);
  border-radius: 10px;
}
.confirm-challenge-label {
  font-size: .85rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-bottom: .35rem;
}
.confirm-challenge-code {
  font-family: Consolas, "Courier New", monospace;
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: .35rem;
  color: var(--ink);
  line-height: 1.2;
}
.confirm-panel input[name="confirm_code"] {
  font-family: Consolas, "Courier New", monospace;
  font-size: 1.35rem;
  letter-spacing: .25rem;
  text-align: center;
  max-width: 10rem;
}