:root {
  --primary: #2563eb;
  --primary-light: #dbeafe;
  --bg: #f4f6fa;
  --card: #ffffff;
  --text: #1e293b;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --teal: #0f6e56;
  --teal-light: #e1f5ee;
  --amber: #f59e0b;
  --red: #ef4444;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  padding-bottom: 48px;
}
.topnav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
}
.topnav .inner {
  max-width: 1180px; margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; gap: 4px; flex-wrap: wrap;
}
.topnav .brand { font-weight: 700; font-size: 15px; color: var(--text); padding: 12px 14px 12px 0; margin-right: 8px; white-space: nowrap; }
.topnav .brand span { color: var(--primary); }
.topnav a {
  padding: 12px 12px; font-size: 13px; color: var(--text-secondary);
  text-decoration: none; border-radius: 8px 8px 0 0; white-space: nowrap;
}
.topnav a:hover { color: var(--primary); background: var(--bg); }
.topnav a.active { color: var(--primary); font-weight: 600; border-bottom: 2px solid var(--primary); }
.container { max-width: 1180px; margin: 0 auto; padding: 0 20px; }
.page-header { padding: 26px 0 18px; }
.page-header h1 { font-size: 24px; font-weight: 700; }
.page-header p { color: var(--text-secondary); font-size: 14px; margin-top: 6px; max-width: 860px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px 22px;
  margin-bottom: 18px;
  box-shadow: 0 1px 3px rgba(15,23,42,.05);
}
.card h2 { font-size: 15px; font-weight: 600; margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
.card h2 .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--primary); display: inline-block; }
.card h3 { font-size: 14px; font-weight: 600; margin: 18px 0 10px; }

.grid2 { display: grid; grid-template-columns: 380px 1fr; gap: 18px; align-items: start; }
@media (max-width: 860px) { .grid2 { grid-template-columns: 1fr; } }

.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; color: var(--text-secondary); margin-bottom: 5px; }
.field .input-wrap { display: flex; align-items: center; gap: 8px; }
.field input[type="number"], .field input[type="text"], .field select {
  width: 100%; padding: 9px 12px;
  border: 1px solid var(--border); border-radius: 9px;
  font-size: 14px; font-family: inherit; background: #fff; color: var(--text);
  outline: none; transition: border-color .15s;
}
.field input:focus, .field select:focus { border-color: var(--primary); }
.field .unit { font-size: 13px; color: var(--text-secondary); white-space: nowrap; min-width: 52px; }
.hint { font-size: 12px; color: var(--text-secondary); background: var(--bg); border-radius: 8px; padding: 8px 12px; margin-top: 4px; }

input[type="range"] {
  width: 100%; -webkit-appearance: none; appearance: none;
  height: 6px; border-radius: 3px;
  background: linear-gradient(to right, #10b981, #f59e0b, #ef4444);
  outline: none; margin: 8px 0 4px;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 18px; height: 18px; border-radius: 50%;
  background: #fff; border: 3px solid var(--primary); cursor: pointer;
  box-shadow: 0 1px 4px rgba(0,0,0,.2);
}
.range-labels { display: flex; justify-content: space-between; font-size: 11px; color: var(--text-secondary); }

.check-row { display: flex; align-items: center; gap: 10px; padding: 9px 12px; border: 1px solid var(--border); border-radius: 9px; margin-bottom: 8px; background: #fff; }
.check-row input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--primary); flex-shrink: 0; }
.check-row .check-name { font-size: 14px; flex: 1; }
.check-row .check-desc { font-size: 12px; color: var(--text-secondary); }

.kpi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin-bottom: 18px; }
.kpi { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; }
.kpi .label { font-size: 12px; color: var(--text-secondary); }
.kpi .value { font-size: 22px; font-weight: 700; margin-top: 2px; font-variant-numeric: tabular-nums; }
.kpi .value small { font-size: 12px; font-weight: 400; color: var(--text-secondary); margin-left: 2px; }
.kpi.highlight { background: linear-gradient(135deg, #eff6ff, #e0f2fe); border-color: #bfdbfe; }
.kpi.highlight .value { color: var(--primary); }

table { width: 100%; border-collapse: collapse; font-size: 13px; margin-top: 8px; }
th, td { padding: 8px 10px; text-align: right; border-bottom: 1px solid var(--border); font-variant-numeric: tabular-nums; }
th { color: var(--text-secondary); font-weight: 500; font-size: 12px; }
th:first-child, td:first-child { text-align: left; }
tr:last-child td { border-bottom: none; }

.flow { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; padding: 4px 0; }
.flow .step {
  background: var(--primary-light); color: var(--primary);
  font-size: 13px; font-weight: 600; padding: 6px 12px; border-radius: 8px; white-space: nowrap;
}
.flow .arrow { color: var(--text-secondary); font-size: 13px; }

.modal-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; }
.modal-chip { background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 12px; }
.modal-chip .mc-label { font-size: 12px; color: var(--text-secondary); }
.modal-chip .mc-value { font-size: 17px; font-weight: 700; margin-top: 2px; font-variant-numeric: tabular-nums; }

footer { text-align: center; margin-top: 30px; font-size: 12px; color: var(--text-secondary); }

.btn {
  background: var(--primary); color: #fff; border: none;
  padding: 10px 18px; border-radius: 9px; font-size: 14px;
  font-family: inherit; font-weight: 600; cursor: pointer;
  transition: background .15s;
}
.btn:hover { background: #1d4ed8; }

/* 主页模块卡片 */
.mod-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 16px; }
.mod-card {
  display: block; background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 20px; text-decoration: none; color: var(--text);
  transition: transform .12s, box-shadow .12s, border-color .12s;
}
.mod-card:hover { transform: translateY(-2px); box-shadow: 0 4px 14px rgba(15,23,42,.08); border-color: var(--primary); }
.mod-card .icon {
  width: 40px; height: 40px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 700; color: #fff; margin-bottom: 12px;
}
.mod-card h3 { font-size: 15px; font-weight: 700; margin: 0 0 6px; }
.mod-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }
.mod-card .tag { display: inline-block; margin-top: 10px; font-size: 12px; color: var(--primary); font-weight: 600; }

/* 主页全局推导 */
.derive-inputs { display: grid; grid-template-columns: 1fr 1fr; gap: 0 14px; }
@media (max-width: 860px) { .derive-inputs { grid-template-columns: 1fr; } }
.derive-inputs .field.full { grid-column: 1 / -1; }

.derive-list { margin-top: 6px; }
.derive-list div { display: flex; justify-content: space-between; gap: 10px; font-size: 12.5px; padding: 4.5px 0; border-bottom: 1px dashed var(--border); }
.derive-list div:last-child { border-bottom: none; }
.derive-list .k { color: var(--text-secondary); }
.derive-list .v { font-weight: 600; font-variant-numeric: tabular-nums; text-align: right; }
.derive-list .v.liq { color: #7c3aed; }
.derive-list .v.air { color: #0f6e56; }

.derive-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 14px; flex-wrap: wrap; }
.derive-head h2 { margin-bottom: 0; }
.btn-ghost {
  background: var(--bg); color: var(--primary); border: 1px solid var(--border);
  padding: 8px 14px; border-radius: 9px; font-size: 13px;
  font-family: inherit; font-weight: 600; cursor: pointer; transition: all .15s;
}
.btn-ghost:hover { background: var(--primary-light); border-color: var(--primary); }

.pue-readout { font-weight: 700; color: var(--primary); font-variant-numeric: tabular-nums; }

/* 冷却设备选型模块 */
.equip-bar { display: flex; flex-wrap: wrap; gap: 10px 18px; align-items: center; margin: 8px 0 14px; font-size: 13px; }
.equip-bar b { font-variant-numeric: tabular-nums; color: var(--primary); }
.equip-bar select {
  padding: 6px 10px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 13px; font-family: inherit; background: #fff; color: var(--text); outline: none; margin-left: 4px;
}
.equip-bar select:focus { border-color: var(--primary); }
.eq-block { margin-top: 14px; padding-top: 12px; border-top: 1px dashed var(--border); }
.eq-block:first-of-type { border-top: none; padding-top: 0; }
.eq-block h3 { font-size: 14px; font-weight: 700; margin: 0 0 8px; }
.eq-block .eq-sel { margin-bottom: 6px; font-size: 13px; color: var(--text-secondary); }
.eq-block .eq-sel select {
  padding: 5px 10px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 13px; font-family: inherit; background: #fff; color: var(--text); outline: none; margin-left: 4px;
}
.eq-block .eq-sel select:focus { border-color: var(--primary); }
.eq-total { font-size: 12.5px; color: var(--teal); font-weight: 600; margin-top: 6px; }