:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --border: #dde3ea;
  --border-strong: #c3ccd7;
  --text: #1c2733;
  --muted: #5f6b7a;
  --primary: #0a70d6;
  --primary-dark: #0b3a6e;
  --primary-soft: #e6f0fa;
  --good: #1f8a5b;
  --good-soft: #e3f4e8;
  --warn: #b7791f;
  --warn-soft: #fdf3e1;
  --bad: #c0392b;
  --bad-soft: #fbe3e1;
  --radius: 8px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .08);
  --font: "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "Cascadia Mono", Consolas, "SFMono-Regular", Menlo, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { background: var(--bg); color: var(--text); font: 14px/1.5 var(--font); }
h1, h2, h3, h4 { margin: 0 0 .5em; line-height: 1.25; color: var(--primary-dark); }
h2 { font-size: 22px; }
h3 { font-size: 16px; }
h4 { font-size: 14px; color: var(--text); }
p { margin: 0 0 .75em; }
a { color: var(--primary); }
small, .muted { color: var(--muted); }
code { font-family: var(--mono); font-size: 12px; background: var(--surface-2); padding: 1px 4px; border-radius: 4px; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: 16px;
  padding: 10px 20px; background: var(--primary-dark); color: #fff;
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 250px; }
.brand-logo { border-radius: 8px; display: block; }
.brand-name { font-weight: 700; font-size: 16px; }
.brand-short { font-weight: 400; opacity: .8; }
.brand-sub { font-size: 12px; opacity: .75; }
.project-title { flex: 1; display: flex; align-items: center; gap: 10px; min-width: 0; }
.project-title input {
  flex: 1; max-width: 420px; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.2);
  color: #fff; border-radius: 6px; padding: 6px 10px; font: inherit;
}
.project-title input::placeholder { color: rgba(255,255,255,.6); }
.save-state { font-size: 12px; opacity: .8; white-space: nowrap; }
.top-actions { display: flex; align-items: center; gap: 8px; }

/* ---------- buttons & forms ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 6px; justify-content: center;
  border: 1px solid var(--border-strong); background: var(--surface); color: var(--text);
  padding: 6px 12px; border-radius: 6px; font: inherit; font-weight: 600; cursor: pointer; text-decoration: none;
  white-space: nowrap;
}
.btn:hover { border-color: var(--primary); }
.btn:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible { outline: 2px solid #5aa9e6; outline-offset: 1px; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: #095d9a; }
.btn-ghost { background: transparent; color: inherit; border-color: rgba(255,255,255,.35); }
.content .btn-ghost { border-color: var(--border-strong); }
.btn-danger { color: var(--bad); }
.btn-sm { padding: 3px 8px; font-size: 12px; }
.btn-niyaa { background: #fff; color: var(--primary-dark); border-color: #fff; }
.btn-niyaa.is-disabled { opacity: .55; cursor: not-allowed; }
.niyaa-mark {
  display: inline-grid; place-items: center; width: 20px; height: 20px; border-radius: 5px;
  background: linear-gradient(135deg, #0b6fb8, #2ba673); color: #fff; font-weight: 800; font-size: 12px;
}
.user-chip { gap: 8px; }
.avatar { display: inline-grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; background: #2ba673; color: #fff; font-size: 12px; }

label { display: block; font-weight: 600; font-size: 12px; color: var(--muted); margin-bottom: 4px; }
input[type=text], input[type=number], input[type=date], input[type=email], select, textarea {
  width: 100%; padding: 6px 8px; border: 1px solid var(--border-strong); border-radius: 6px;
  background: var(--surface); color: var(--text); font: inherit;
}
textarea { min-height: 80px; resize: vertical; }
input[type=number] { text-align: right; }
.field { margin-bottom: 12px; }
.field .hint { font-size: 12px; color: var(--muted); margin-top: 3px; }
.grid { display: grid; gap: 12px 16px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.row.spread { justify-content: space-between; }
.check { display: flex; align-items: center; gap: 6px; font-weight: 500; color: var(--text); font-size: 13px; }
.check input { margin: 0; }

/* ---------- menus ---------- */
.menu { position: relative; }
.menu-list {
  display: none; position: absolute; right: 0; top: calc(100% + 6px); min-width: 240px; z-index: 40;
  background: var(--surface); color: var(--text); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(16,24,40,.18); padding: 6px;
}
.menu-list.open { display: block; }
.menu-list button { display: block; width: 100%; text-align: left; background: none; border: 0; padding: 8px 10px; border-radius: 6px; font: inherit; color: inherit; cursor: pointer; }
.menu-list button:hover { background: var(--primary-soft); }
.menu-list hr { border: 0; border-top: 1px solid var(--border); margin: 4px 0; }
.menu-note { padding: 8px 10px; font-size: 12px; color: var(--muted); }

/* ---------- layout ---------- */
.layout { display: grid; grid-template-columns: 230px minmax(0, 1fr); min-height: calc(100vh - 58px); }
.steps { background: var(--surface); border-right: 1px solid var(--border); padding: 14px 10px; display: flex; flex-direction: column; gap: 2px; position: sticky; top: 58px; height: calc(100vh - 58px); overflow: auto; }
.step { display: flex; align-items: center; gap: 10px; border: 0; background: none; text-align: left; padding: 9px 10px; border-radius: 6px; font: inherit; color: var(--text); cursor: pointer; }
.step:hover { background: var(--surface-2); }
.step.is-active { background: var(--primary-soft); color: var(--primary-dark); font-weight: 700; }
.step .n { display: inline-grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; background: var(--surface-2); border: 1px solid var(--border-strong); font-size: 11px; font-weight: 700; }
.step.is-active .n { background: var(--primary); color: #fff; border-color: var(--primary); }
.steps-foot { margin-top: auto; padding: 10px 4px 0; border-top: 1px solid var(--border); }
.mini-result { font-size: 12px; background: var(--surface-2); border: 1px solid var(--border); border-radius: 6px; padding: 8px; margin-bottom: 8px; }
.mini-result strong { font-size: 18px; color: var(--primary-dark); display: block; }
.guest-note { font-size: 11px; color: var(--muted); }

.content { padding: 22px 26px 60px; min-width: 0; }
.panel { display: none; }
.panel.is-active { display: block; }
.panel-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 14px; flex-wrap: wrap; }
.panel-head p { color: var(--muted); max-width: 820px; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px 18px; margin-bottom: 16px; }
.card > h3:first-child { margin-top: 0; }
.card-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 10px; flex-wrap: wrap; }
.card-head h3 { margin: 0; }

.banner { padding: 10px 20px; font-size: 13px; }
.banner-error { background: var(--bad-soft); color: var(--bad); }
.callout { border-left: 4px solid var(--primary); background: var(--primary-soft); padding: 10px 12px; border-radius: 6px; font-size: 13px; margin: 10px 0; }
.callout.warn { border-color: var(--warn); background: var(--warn-soft); }
.callout.bad { border-color: var(--bad); background: var(--bad-soft); }
.callout.good { border-color: var(--good); background: var(--good-soft); }

/* ---------- tables ---------- */
.table-wrap { overflow: auto; border: 1px solid var(--border); border-radius: 6px; }
table.data { width: 100%; border-collapse: collapse; font-size: 13px; }
table.data th, table.data td { padding: 6px 8px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: middle; }
table.data th { background: var(--surface-2); font-size: 12px; color: var(--muted); position: sticky; top: 0; z-index: 1; white-space: nowrap; }
table.data td.num, table.data th.num { text-align: right; font-variant-numeric: tabular-nums; }
table.data tr:last-child td { border-bottom: 0; }
table.data input, table.data select { padding: 3px 6px; }
table.data tfoot td { font-weight: 700; background: var(--surface-2); }
.scroll-400 { max-height: 400px; }

/* ---------- KPIs / results ---------- */
.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; margin-bottom: 16px; }
.kpi { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 14px; box-shadow: var(--shadow); }
.kpi .label { font-size: 12px; color: var(--muted); }
.kpi .value { font-size: 26px; font-weight: 700; color: var(--primary-dark); line-height: 1.2; }
.kpi .sub { font-size: 12px; color: var(--muted); }
.kpi.accent { background: var(--primary-dark); border-color: var(--primary-dark); }
.kpi.accent .label, .kpi.accent .sub { color: #cfe3f5; }
.kpi.accent .value { color: #fff; }

.meter { margin: 8px 0 14px; }
.meter-head { display: flex; justify-content: space-between; font-size: 13px; margin-bottom: 4px; }
.meter-track { position: relative; height: 12px; background: var(--surface-2); border: 1px solid var(--border); border-radius: 6px; overflow: hidden; }
.meter-fill { position: absolute; inset: 0 auto 0 0; background: var(--primary); border-radius: 6px 0 0 6px; }
.meter-fill.warn { background: var(--warn); }
.meter-fill.bad { background: var(--bad); }
.meter-mark { position: absolute; top: -2px; bottom: -2px; width: 2px; background: var(--primary-dark); }
.pill { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 11px; font-weight: 700; background: var(--surface-2); border: 1px solid var(--border); }
.pill.good { background: var(--good-soft); color: var(--good); border-color: transparent; }
.pill.warn { background: var(--warn-soft); color: var(--warn); border-color: transparent; }
.pill.bad { background: var(--bad-soft); color: var(--bad); border-color: transparent; }
.pill.info { background: var(--primary-soft); color: var(--primary-dark); border-color: transparent; }

ul.clean { margin: 0; padding-left: 18px; }
ul.clean li { margin-bottom: 4px; }
.src { font-size: 11px; }
.src a { color: var(--muted); }

/* ---------- drop zone ---------- */
.dropzone { border: 2px dashed var(--border-strong); border-radius: var(--radius); padding: 24px; text-align: center; background: var(--surface-2); cursor: pointer; }
.dropzone.drag { border-color: var(--primary); background: var(--primary-soft); }

/* ---------- diagrams ---------- */
.diagram-box { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); overflow: auto; padding: 8px; }
.diagram-box svg { display: block; margin: 0 auto; max-width: 100%; height: auto; }
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 12px; flex-wrap: wrap; }
.tab { border: 0; background: none; padding: 8px 14px; font: inherit; font-weight: 600; color: var(--muted); border-bottom: 2px solid transparent; cursor: pointer; }
.tab.is-active { color: var(--primary-dark); border-bottom-color: var(--primary); }

/* ---------- rack designer ---------- */
.rack-layout { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 16px; align-items: start; }
.palette { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 10px; position: sticky; top: 76px; max-height: calc(100vh - 100px); overflow: auto; }
.palette h4 { margin: 10px 0 6px; font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.palette-item { display: flex; align-items: center; justify-content: space-between; gap: 6px; padding: 6px 8px; border: 1px solid var(--border); border-radius: 6px; margin-bottom: 4px; background: var(--surface-2); cursor: grab; font-size: 12px; user-select: none; }
.palette-item:hover { border-color: var(--primary); }
.palette-item .u { color: var(--muted); font-size: 11px; }
.racks { display: flex; gap: 24px; overflow-x: auto; padding-bottom: 10px; align-items: flex-start; }
.rack-col { flex: 0 0 auto; }
.rack-col .rack-title { display: flex; gap: 6px; align-items: center; margin-bottom: 6px; }
.rack-col .rack-title input { width: 160px; }
.rack-svg { background: #fff; border: 1px solid var(--border); border-radius: 6px; }
.rack-svg .slot-drop { fill: rgba(11, 111, 184, .18); stroke: var(--primary); stroke-dasharray: 4 3; }
.rack-svg .slot-bad { fill: rgba(192, 57, 43, .2); stroke: var(--bad); }
.rack-svg .item { cursor: grab; }
.rack-svg .item.selected rect.sel { stroke: #f5a623; stroke-width: 3; }
.rack-inspector { margin-top: 12px; }

/* ---------- modal & toast ---------- */
.modal { border: 0; border-radius: 10px; padding: 0; width: min(720px, 94vw); box-shadow: 0 20px 60px rgba(0,0,0,.3); }
.modal::backdrop { background: rgba(10, 20, 35, .45); }
.modal-body { padding: 20px; max-height: 80vh; overflow: auto; }
.toast { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%) translateY(20px); opacity: 0; transition: .2s; background: #1c2733; color: #fff; padding: 10px 16px; border-radius: 8px; z-index: 100; pointer-events: none; max-width: 90vw; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { background: var(--bad); }

.spinner { display: inline-block; width: 14px; height: 14px; border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%; animation: spin .7s linear infinite; vertical-align: -2px; }
@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 1100px) {
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .rack-layout { grid-template-columns: 1fr; }
  .palette { position: static; max-height: none; }
}
@media (max-width: 820px) {
  .layout { grid-template-columns: 1fr; }
  .steps { position: static; height: auto; flex-direction: row; overflow-x: auto; border-right: 0; border-bottom: 1px solid var(--border); }
  .steps-foot { display: none; }
  .step { white-space: nowrap; }
  .topbar { flex-wrap: wrap; }
  .brand { min-width: 0; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .content { padding: 16px; }
}
@media print {
  .topbar, .steps, .palette { display: none; }
  .layout { display: block; }
  .panel { display: block !important; page-break-after: always; }
}