:root {
  --navy: #13284B;
  --navy-2: #0e1f3c;
  --cell: #2B4A78;
  --cell-2: #35568a;
  --gold: #F2B53A;
  --copper: #E07A2E;
  --light: #E3E8EE;
  --ink: #0b1a33;
  --muted: #8FA6C8;
  --card: #17345e;
  --shadow: 0 10px 18px rgba(8, 18, 36, 0.42), 0 2px 4px rgba(8, 18, 36, 0.28);
  --shadow-sm: 0 6px 12px rgba(8, 18, 36, 0.35), 0 1px 2px rgba(8, 18, 36, 0.25);
  --radius: 16px;
  --font: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Segoe UI", system-ui, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--navy-2); color: var(--light); font-family: var(--font); }
body { min-height: 100vh; }
.top {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  padding: 12px 20px; background: var(--navy); position: sticky; top: 0; z-index: 20;
  box-shadow: var(--shadow);
}
.brand { display: flex; align-items: center; gap: 10px; }
.logo-float {
  width: 80px; height: 80px; object-fit: contain;
}
h1 { margin: 0; font-size: 1.6rem; letter-spacing: 0.04em; }
.tag { margin: 0; color: var(--muted); font-size: 0.85rem; }
.tabs { display: flex; gap: 8px; flex: 1; }
.tab, .lang, .btn, .chip {
  border: 0; cursor: pointer; font: inherit; font-weight: 700;
  border-radius: 12px; padding: 8px 14px;
  box-shadow: var(--shadow-sm);
}
.tab { background: var(--cell); color: var(--light); }
.tab.on { background: var(--gold); color: var(--navy); }
.lang { background: var(--light); color: var(--navy); }
.btn { background: var(--gold); color: var(--navy); }
.btn.copper { background: var(--copper); color: #fff; }
.btn.ghost { background: var(--cell); color: var(--light); }
.chip { background: var(--cell); color: var(--light); padding: 6px 12px; }
.chip.on { background: var(--copper); color: #fff; }
main { padding: 18px; max-width: 1400px; margin: 0 auto; }
.panel { display: none; }
.panel.on { display: block; }
.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
}
.card-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; }
h2 { margin: 0 0 10px; font-size: 1.15rem; }
h3 { margin: 14px 0 8px; font-size: 1rem; color: var(--gold); }
.lbl { display: flex; flex-direction: column; gap: 6px; font-weight: 700; font-size: 0.9rem; }
.hint { color: var(--muted); font-size: 0.85rem; margin: 8px 0 0; }
.row { display: flex; gap: 8px; align-items: center; }
.row.wrap { flex-wrap: wrap; margin: 8px 0; }
.grow { flex: 1; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
input, select {
  background: #0f2748; color: var(--light); border: 1px solid #2B4A78;
  border-radius: 10px; padding: 8px 10px; font: inherit; min-width: 0;
  box-shadow: inset 0 1px 2px rgba(0,0,0,.25);
}
input:focus, select:focus { outline: 2px solid var(--gold); }
.table-wrap { overflow: auto; margin-top: 8px; }
table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
th, td { padding: 6px 8px; text-align: left; border-bottom: 1px solid #234066; }
th { color: var(--muted); font-weight: 700; }
.warn { color: var(--gold); font-weight: 700; }
.hidden { display: none; }
.check { display: flex; align-items: center; gap: 6px; }
.dec input { width: 64px; }
.mean { font-size: 1.05rem; font-weight: 800; color: var(--gold); margin: 0 0 8px; }
.ptable {
  display: grid;
  grid-template-columns: repeat(18, minmax(42px, 1fr));
  grid-auto-rows: minmax(52px, auto);
  gap: 6px;
  min-width: 820px;
  padding: 6px 2px 10px;
}
.table-card { overflow-x: auto; }
.pt-cell, .pt-ph {
  border: 0; border-radius: 10px; padding: 4px 3px 3px;
  min-height: 52px; cursor: pointer; color: var(--light);
  background: var(--cell);
  box-shadow: var(--shadow-sm);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  font-weight: 800; line-height: 1.05;
}
.pt-cell .z, .pt-cell .m { font-size: 9px; font-weight: 600; color: var(--muted); }
.pt-cell .sy { font-size: 15px; }
.pt-cell.alloying { box-shadow: var(--shadow-sm), inset 0 3px 0 var(--gold); }
.pt-cell.sel { background: var(--gold); color: var(--navy); }
.pt-cell.sel .z, .pt-cell.sel .m { color: var(--navy); }
.pt-ph { background: #1b365c; color: var(--muted); font-size: 10px; cursor: default; box-shadow: none; }
.list { display: flex; flex-direction: column; gap: 8px; }
.item {
  background: #0f2748; border-radius: 12px; padding: 10px 12px;
  display: flex; justify-content: space-between; align-items: flex-start; gap: 8px;
  flex-wrap: wrap;
  box-shadow: var(--shadow-sm);
}
.item button { margin-left: 4px; }
.item details { margin-top: 4px; }
.item summary { cursor: pointer; }
.weigh-out .line { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid #234066; font-size: 1.05rem; }
.out { background: #0f2748; padding: 10px; border-radius: 10px; white-space: pre-wrap; }
.about { text-align: center; max-width: 720px; margin: 0 auto; }
.logo-hero { width: 180px; height: 180px; object-fit: contain; filter: drop-shadow(0 14px 18px rgba(0,0,0,.4)); }
.cite { text-align: left; color: var(--muted); font-size: 0.9rem; }
canvas { width: 100%; display: block; margin: 8px 0; }
@media (max-width: 960px) {
  .split, .grid2 { grid-template-columns: 1fr; }
  h1 { font-size: 1.3rem; }
}