:root{
  --bg:#eef3f7;
  --panel:#fdfdfb;
  --panel-soft:#f4f8f6;
  --line:#c8d3dc;
  --line-soft:#dfe7ee;
  --accent:#0e7c86;
  --accent-dark:#0a5f67;
  --head-bg:#12455a;
  --head-text:#ffffff;
  --result:#0b7a3b;
  --result-bg:#dff3e4;
  --warn:#c0392b;
  --warn-bg:#fdeaea;
  --text:#1f2d3a;
  --muted:#5a6b79;
  --nav-bg:#d9e4ec;
  --chip:#e7eef4;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:"Segoe UI","Microsoft YaHei","PingFang SC",system-ui,Arial,sans-serif;
  background:linear-gradient(180deg,#e3ebf2 0%,var(--bg) 60px);
  color:var(--text);
  font-size:14px;
  line-height:1.45;
}

/* ---------- Header ---------- */
.app-header{
  background:linear-gradient(90deg,var(--head-bg),#1b5a74);
  color:var(--head-text);
  padding:0 18px;
  height:54px;
  display:flex;
  align-items:center;
  gap:14px;
  box-shadow:0 2px 6px rgba(0,0,0,.25);
  position:sticky;top:0;z-index:50;
}
.app-header .brand{
  display:flex;align-items:center;gap:10px;font-weight:600;font-size:16px;
  white-space:nowrap;min-width:0;overflow:hidden;text-overflow:ellipsis;
}
.app-header .brand .logo{
  width:28px;height:28px;border-radius:6px;flex:none;
  background:linear-gradient(135deg,#18a8b5,#0c6070);
  display:flex;align-items:center;justify-content:center;font-size:16px;
}
.app-header .spacer{flex:1}
.header-actions{display:flex;align-items:center;gap:8px}
.btn{
  appearance:none;border:1px solid var(--line);background:#fff;color:var(--text);
  padding:7px 14px;border-radius:6px;cursor:pointer;font-size:13px;
  transition:background .15s,border .15s,transform .05s;
  display:inline-flex;align-items:center;gap:6px;text-decoration:none;white-space:nowrap;
}
.btn:hover{background:#f0f5f9}
.btn:active{transform:translateY(1px)}
.btn.primary{background:linear-gradient(180deg,#0e909c,#0a6f7a);border-color:#0a6f7a;color:#fff}
.btn.primary:hover{background:linear-gradient(180deg,#12a3b0,#0b7c88)}
.btn.header{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.25);color:#fff}
.btn.header:hover{background:rgba(255,255,255,.22);color:#fff}
.btn.tab{background:var(--nav-bg);border-color:#b7c6d3;color:var(--text);border-radius:8px 8px 0 0;padding:8px 14px}
.btn.tab.active{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}
select.lang{
  appearance:none;background:rgba(255,255,255,.14);color:#fff;border:1px solid rgba(255,255,255,.3);
  border-radius:6px;padding:6px 8px;font-size:13px;cursor:pointer;
}
select.lang option{color:#111;background:#fff}

/* ---------- Layout ---------- */
.wrap{max-width:1180px;margin:18px auto 40px;padding:0 16px}
.page-title{font-size:20px;font-weight:600;margin:6px 0 4px}
.page-desc{color:var(--muted);margin:0 0 16px}
.tabbar{display:flex;flex-wrap:wrap;gap:2px;margin:6px 0 0}

.card{
  background:var(--panel);border:1px solid var(--line);border-radius:10px;
  box-shadow:0 1px 3px rgba(20,50,70,.06);
}
.card .card-head{
  padding:10px 16px;border-bottom:1px solid var(--line-soft);
  font-weight:600;font-size:14px;display:flex;align-items:center;gap:8px;
  background:linear-gradient(180deg,#f7fafc,#eef3f7);
  border-radius:10px 10px 0 0;
}
.card .card-body{padding:14px 16px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media (max-width:900px){.grid2,.grid3{grid-template-columns:1fr}}

/* ---------- Home module grid ---------- */
.herogrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;margin-top:6px}
.mcard{display:flex;flex-direction:column;gap:10px;text-decoration:none;color:var(--text);
  border:1px solid var(--line);border-radius:12px;padding:16px;background:#fff;
  box-shadow:0 1px 3px rgba(20,50,70,.06);transition:transform .12s,box-shadow .12s,border-color .12s;}
.mcard:hover{transform:translateY(-3px);box-shadow:0 6px 16px rgba(20,50,70,.14);border-color:var(--accent)}
.mcard .ic{width:40px;height:40px;border-radius:9px;display:flex;align-items:center;justify-content:center;
  font-size:20px;color:#fff;background:var(--accent)}
.mcard h3{margin:0;font-size:16px}
.mcard p{margin:0;color:var(--muted);font-size:13px;flex:1}
.mcard .go{color:var(--accent);font-weight:600;font-size:13px}
.mcard:nth-child(2) .ic{background:#c77d0e}
.mcard:nth-child(3) .ic{background:#3a7bd5}
.mcard:nth-child(4) .ic{background:#7547c9}
.mcard:nth-child(5) .ic{background:#c23a6b}
.mcard:nth-child(6) .ic{background:#2e9e6b}
.mcard:nth-child(7) .ic{background:#b3582e}

/* ---------- Forms ---------- */
.field{display:grid;grid-template-columns:1fr auto;gap:8px;align-items:center;padding:6px 0;border-bottom:1px dashed var(--line-soft)}
.field label{font-size:13.5px}
.field input[type=number]{
  width:130px;padding:6px 8px;border:1px solid var(--line);border-radius:6px;font-size:13.5px;
  text-align:right;background:#fff;color:var(--text);
}
.field input[type=number]:focus{outline:2px solid var(--accent);border-color:var(--accent)}
.field .unit{color:var(--muted);font-size:12.5px;min-width:46px;text-align:left}
.result-row{display:grid;grid-template-columns:1fr auto auto;gap:8px;align-items:center;padding:7px 0;border-bottom:1px dashed var(--line-soft)}
.result-row .rname{font-size:13.5px}
.rcell{display:flex;align-items:center;gap:8px;justify-content:flex-end}
.rbox{
  min-width:150px;padding:6px 10px;border-radius:6px;text-align:right;font-weight:600;
  background:var(--result-bg);color:var(--result);border:1px solid #bfe6cb;font-variant-numeric:tabular-nums;
}
.rbox.warn{background:var(--warn-bg);color:var(--warn);border-color:#f3c6bd}
.rbox.empty{background:#f4f6f8;color:#a8b3bd;font-weight:400;border-color:var(--line-soft)}
.rbox.tall{min-width:150px;display:inline-block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;vertical-align:middle;color:var(--text);font-weight:600}
.rref{font-size:12px;color:var(--muted);white-space:nowrap}
.unit-widget{border-top:1px dashed var(--line-soft);margin-top:14px;padding-top:12px}
.unit-widget h4{font-size:13px;margin:0 0 8px;color:var(--accent-dark);font-weight:600}
.unit-widget .uw-wrap{display:flex;flex-direction:column;gap:8px}
.uw-row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.unit-widget select,.unit-widget input[type=number]{
  border:1px solid var(--line);border-radius:6px;padding:6px 8px;font-size:13px;background:#fff;color:var(--text);font-family:inherit;
}
.unit-widget input[type=number]{width:100px}
.unit-widget select.uw-cat{max-width:100%}
.uw-eq{color:var(--muted);font-weight:600}
.uw-btn{appearance:none;border:1px solid var(--line);background:#fff;color:var(--text);border-radius:6px;padding:6px 10px;cursor:pointer;font-size:12px}
.uw-btn:hover{background:#f0f5f9}
.uw-out{font-weight:700;color:var(--accent-dark);min-width:70px;display:inline-block;white-space:nowrap}
.a-unit-link{color:inherit;cursor:pointer;text-decoration:none;border-bottom:1px dashed var(--accent);transition:color .15s}
.a-unit-link:hover{color:var(--accent)}
.a-unit-link::before{content:'⇄ ';font-size:11px;color:var(--accent)}
.formula{margin:4px 0 0;font-size:12.5px;color:var(--muted);font-style:italic}
.note{background:#fff8e6;border:1px solid #f0dfae;border-radius:8px;padding:10px 12px;font-size:12.8px;color:#6b5b1e}

/* ---------- Diagram placeholder (SVG style) ---------- */
.diagram{
  background:linear-gradient(180deg,#0d3a2c,#14503c);
  border-radius:10px;color:#cfe8d8;min-height:180px;position:relative;overflow:hidden;
  display:flex;align-items:center;justify-content:center;border:1px solid #0a2c21;
}
.diagram .dim{fill:#ffe066;font-size:11px;font-family:Consolas,monospace}
.diagram .shape{fill:none;stroke:#eaf6c8;stroke-width:1.6}
.diagram .shape2{fill:none;stroke:#8fd3c0;stroke-width:1.2}
.diagram .cap{position:absolute;right:8px;bottom:6px;font-size:11px;color:#9fc7ad}

.foot{text-align:center;color:var(--muted);font-size:12.5px;margin:30px 0 10px}

@media (max-width:640px){
  .app-header{flex-wrap:wrap;height:auto;padding:10px 12px;gap:8px}
  .header-actions{width:100%;justify-content:flex-end}
  .card .card-body{padding:10px}
}

/* ---------- Module toolbar ---------- */
.toolbar{width:min(1180px - 32px, 100% - 0px);margin:14px auto 16px;display:flex;flex-wrap:wrap;gap:8px;align-items:center;background:#fff;border:1px solid var(--line);
  border-radius:10px;padding:8px 12px;box-shadow:0 1px 3px rgba(20,50,70,.06)}
.toolbar .lbl{color:var(--muted);font-size:12.5px}
.toolbar select{padding:5px 8px;border:1px solid var(--line);border-radius:6px;font-size:13px}
.toolbar .grp{display:flex;align-items:center;gap:6px}
.toolbar .sep{width:1px;height:22px;background:var(--line-soft);margin:0 4px}
.toolbar .btn{font-size:12.5px}
.chk{display:flex;align-items:center;gap:5px;font-size:13px;cursor:pointer}
.chk input{accent-color:var(--accent)}

/* ---------- Field separator (basic / deep sections) ---------- */
.sep-line{height:1px;background:var(--line-soft);margin:12px 0;border:none}
#hpToast{position:fixed;top:64px;right:18px;background:var(--accent);color:#fff;padding:8px 14px;border-radius:8px;
  font-size:13px;opacity:0;transform:translateY(-6px);transition:all .25s;pointer-events:none;z-index:99}
#hpToast.show{opacity:1;transform:none}

/* ---------- Gauge bars ---------- */
.gaugerow{position:relative;height:7px;background:#e6edf2;border-radius:4px;overflow:hidden;margin:3px 0 10px}
.gauge{height:100%;width:0%;background:linear-gradient(90deg,#3fbf6f,#8fdc6a);border-radius:4px;
  transition:width .25s ease}
.gauge.over{background:linear-gradient(90deg,#e2a23a,#e0593f)}
.gaugecap{position:absolute;right:2px;top:-10px;font-size:10px;color:var(--muted)}
.rbox{position:relative}

/* ---------- Suggestion box ---------- */
.sug{border-radius:8px;padding:8px 11px;font-size:12.8px;margin-top:10px;line-height:1.4}
.sug.ok{background:#eaf6ee;border:1px solid #bcdcc8;color:#1f6e45}
.sug.warn{background:var(--warn-bg);border:1px solid #f0c7bd;color:#a1402f}
.sug.warn::first-line,.sug.ok::first-line{font-weight:600}

/* ---------- Converter page ---------- */
.conv-card .conv-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px;align-items:end}
.conv-card .field{grid-template-columns:1fr;gap:4px}
.conv-card .field label{font-weight:600}
.conv-card select,input[type=number]{width:100%;padding:8px;border:1px solid var(--line);border-radius:7px;font-size:14px}
.conv-big{font-size:22px;font-weight:700;color:var(--accent)}
@media(max-width:720px){.conv-card .conv-grid{grid-template-columns:1fr}}
.catrow{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}
.catrow .cat{padding:6px 12px;border:1px solid var(--line);border-radius:20px;font-size:13px;cursor:pointer;background:#fff;color:var(--text)}
.catrow .cat.on{background:var(--accent);color:#fff;border-color:var(--accent)}