* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
  background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
  min-height: 100vh; color: #e8eef2; padding: 24px 16px;
}
.wrap { max-width: 980px; margin: 0 auto; }
h1 { font-size: 1.5rem; margin-bottom: 4px; }
.sub { color: #9fb3c8; font-size: .88rem; margin-bottom: 18px; }

nav { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
nav button {
  padding: 8px 16px; border-radius: 20px; border: 1px solid rgba(255,255,255,.2);
  background: rgba(255,255,255,.06); color: #cbd5e1; cursor: pointer; font-size: .88rem;
}
nav button.active { background: linear-gradient(90deg, #0ea5e9, #2563eb); color: #fff; border-color: transparent; }

.panel { display: none; }
.panel.active { display: block; }

.card {
  background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.12);
  border-radius: 12px; padding: 18px; margin-bottom: 14px;
}
.card h2 { font-size: .98rem; margin-bottom: 12px; color: #7dd3fc; }
.card h3 { font-size: .85rem; margin: 14px 0 8px; color: #93c5fd; }
label { display: block; font-size: .78rem; color: #9fb3c8; margin-bottom: 3px; }
select, input {
  width: 100%; padding: 7px 10px; border-radius: 8px; font-size: .88rem;
  border: 1px solid rgba(255,255,255,.2); background: rgba(0,0,0,.3); color: #e8eef2;
}
.row { display: flex; gap: 10px; margin-bottom: 10px; flex-wrap: wrap; }
.row > div { flex: 1; min-width: 130px; }
.layer-tag { font-size: .76rem; color: #7dd3fc; margin: 10px 0 5px; }
.hint { font-size: .76rem; color: #94a3b8; margin-top: 6px; }

button.calc {
  width: 100%; padding: 11px; border: none; border-radius: 8px; cursor: pointer;
  font-size: .95rem; font-weight: 600; color: #fff;
  background: linear-gradient(90deg, #0ea5e9, #2563eb); margin-top: 6px;
}
button.calc:disabled { opacity: .5; cursor: wait; }
button.small {
  padding: 8px 18px; border: none; border-radius: 8px; cursor: pointer; color: #fff;
  background: linear-gradient(90deg, #0ea5e9, #2563eb); font-size: .88rem;
}

.results { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; }
.stat { background: rgba(0,0,0,.25); border-radius: 10px; padding: 12px; text-align: center; }
.stat .v { font-size: 1.35rem; font-weight: 700; color: #7dd3fc; }
.stat .k { font-size: .74rem; color: #9fb3c8; margin-top: 4px; }

table { width: 100%; border-collapse: collapse; font-size: .82rem; margin-top: 8px; }
th, td { padding: 6px 8px; text-align: center; border-bottom: 1px solid rgba(255,255,255,.1); }
th { color: #93c5fd; font-weight: 600; }
.table-scroll { overflow-x: auto; }

.err { color: #fca5a5; font-size: .84rem; margin-top: 10px; white-space: pre-wrap; }
.ok-msg { color: #86efac; font-size: .84rem; margin-top: 10px; }
.hidden { display: none; }
.toggle-row { display: flex; align-items: center; gap: 8px; margin: 8px 0; }
.toggle-row input[type=checkbox] { width: auto; }
.toggle-row label { margin: 0; font-size: .84rem; color: #cbd5e1; }