:root {
  --bg-1: #d9e4d5;
  --bg-2: #e2e9de;
  --bg-3: #e9edf3;
  --panel: #edf2f8;
  --panel-strong: #f8fafc;
  --panel-input: #e8eef6;
  --text: #132031;
  --text-2: #1f3349;
  --muted: #64748b;
  --border: #cad5e3;
  --border-2: #aebdd0;
  --green: #4A7C59;
  --green-dark: #2d5a3a;
  --green-soft: #e2ebe2;
  --ok: #15803d;
  --ok-bg: #dcfce7;
  --warn: #9a3412;
  --warn-bg: #fff7ed;
  --bad: #b91c1c;
  --bad-bg: #fee2e2;
  --blue: #1d4ed8;
  --radius: 12px;
  --mono: "JetBrains Mono", "Fira Code", Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  min-height: 100vh;
  padding: 20px;
  background: linear-gradient(170deg, var(--bg-1) 0%, var(--bg-2) 30%, var(--bg-3) 70%);
  color: var(--text);
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.45;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-thumb { background: #9fb0c4; border-radius: 3px; }

.app { max-width: 1360px; margin: 0 auto; }
.header {
  display: flex;
  align-items: flex-end;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.brand { min-width: 0; }
.title-row { display: flex; align-items: center; gap: 10px; }
.logo {
  width: 38px;
  height: 38px;
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--green), var(--green-dark));
  color: #fff;
  font-size: 20px;
  font-weight: 900;
  box-shadow: 0 3px 10px rgba(45, 90, 58, .18);
}
h1 { font-size: 24px; font-weight: 750; letter-spacing: -.02em; line-height: 1.15; }
.subtitle { margin: 4px 0 0 48px; color: #42536a; font-size: 13px; }
.header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 9px;
  flex-wrap: wrap;
}
.status-chip {
  padding: 7px 13px;
  border: 1.5px solid #93a4b8;
  border-radius: 999px;
  background: rgba(248, 250, 252, .72);
  color: #475569;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .04em;
}
.tool-btn,
.tab-btn {
  appearance: none;
  text-decoration: none;
  border: 1.5px solid var(--border-2);
  background: #eef3f9;
  color: var(--text-2);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 750;
  cursor: pointer;
  transition: background .15s ease, border-color .15s ease, transform .08s ease;
}
.tool-btn { padding: 8px 13px; border-radius: 8px; }
.tool-btn:hover, .tab-btn:hover { border-color: #7d93ad; background: #e6edf6; }
.tool-btn:active, .tab-btn:active, button:active { transform: translateY(1px); }

.tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.tab-btn { display: inline-flex; align-items: center; padding: 8px 16px; border-radius: 9px; }
.tab-btn.active { background: var(--green); border-color: var(--green-dark); color: #fff; }

.notice {
  margin-bottom: 16px;
  padding: 9px 12px;
  border: 1px solid #d6c7a7;
  border-left: 4px solid #b7791f;
  border-radius: 8px;
  background: rgba(255, 247, 237, .78);
  color: #7c3f12;
  font-size: 12px;
  line-height: 1.5;
}

.layout { display: grid; grid-template-columns: 360px minmax(0, 1fr); gap: 20px; align-items: start; }
.stack { display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.card {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: 0 1px 4px rgba(0, 0, 0, .07);
}
.card-header {
  min-height: 40px;
  padding: 10px 14px;
  border-bottom: 1px solid #dde6f0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.card-header h2,
.card-header h3 {
  color: var(--green);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .075em;
  text-transform: uppercase;
}
.card-body { padding: 12px 14px; }

.section-title {
  margin: 2px 0 8px;
  color: #475569;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; }
.field { display: grid; gap: 3px; min-width: 0; }
.field label {
  display: block;
  color: #37485d;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 750;
  letter-spacing: .035em;
  text-transform: uppercase;
}
.unit-wrap { position: relative; min-width: 0; }
input, select {
  width: 100%;
  min-height: 34px;
  padding: 7px 8px;
  border: 1.5px solid #afbccb;
  border-radius: 6px;
  background: var(--panel-input);
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  outline: none;
}
input:focus, select:focus {
  border-color: var(--green) !important;
  box-shadow: 0 0 0 2px rgba(74, 124, 89, .12);
}
input:disabled { color: #8190a3; background: #e1e7ef; cursor: not-allowed; }
.unit-wrap input { padding-right: 48px; }
.unit {
  position: absolute;
  right: 9px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
  pointer-events: none;
}
.hint,
.source-note {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
  line-height: 1.48;
}
.check {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 7px 8px;
  border: 1px solid #d8e3ee;
  border-radius: 8px;
  background: var(--panel-strong);
  color: var(--text-2);
  font-family: var(--mono);
  font-size: 10px;
  line-height: 1.45;
}
.check input { width: 16px; min-height: 16px; margin-top: 1px; accent-color: var(--green); }
.check label { text-transform: none; letter-spacing: 0; font-size: 10px; line-height: 1.45; }
.divider { height: 1px; margin: 13px 0; background: #d8e3ee; }

.actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 13px; }
button { font: inherit; }
.btn-primary, .btn-secondary, .btn-plain {
  min-height: 35px;
  padding: 7px 10px;
  border-radius: 7px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 800;
  cursor: pointer;
  transition: background .15s ease, border-color .15s ease, transform .08s ease;
}
.btn-primary { border: 1.5px solid var(--green-dark); background: var(--green); color: #fff; }
.btn-primary:hover { background: #3f704f; }
.btn-secondary, .btn-plain { border: 1.5px solid var(--border-2); background: var(--panel-strong); color: var(--green-dark); }
.btn-secondary:hover, .btn-plain:hover { border-color: var(--green); background: var(--green-soft); }
.btn-small { min-height: 30px; padding: 5px 8px; font-size: 10px; }

#summaryCard { border-top: 4px solid var(--green); }
.result-hero {
  min-height: 190px;
  padding: 18px 20px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 18px;
  align-items: center;
}
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 10px;
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .03em;
  text-transform: uppercase;
}
.status-ok { color: var(--ok); background: var(--ok-bg); border: 1.5px solid #86efac; }
.status-bad { color: var(--bad); background: var(--bad-bg); border: 1.5px solid #fca5a5; }
.status-neutral { color: #475569; background: var(--panel-strong); border: 1.5px solid #cbd5e1; }
.result-main {
  margin: 11px 0 3px;
  color: var(--text);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 850;
  letter-spacing: -.035em;
  font-variant-numeric: tabular-nums;
}
.result-sub { margin-bottom: 12px; color: #42536a; font-size: 12px; }
.metric-row { display: flex; flex-wrap: wrap; gap: 7px; }
.metric-chip {
  min-width: 125px;
  padding: 7px 9px;
  border: 1px solid #d8e3ee;
  border-radius: 8px;
  background: var(--panel-strong);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 9px;
  text-transform: uppercase;
}
.metric-chip strong { display: block; margin-top: 2px; color: var(--text); font-size: 12px; text-transform: none; }

.bearing-figure { display: grid; place-items: center; }
.bearing-box {
  width: 176px;
  height: 96px;
  position: relative;
  border: 3px solid #172219;
  border-radius: 4px;
  background: repeating-linear-gradient(135deg, #252b26 0, #252b26 6px, #323a34 6px, #323a34 12px);
  transform: perspective(500px) rotateX(56deg) rotateZ(-18deg);
  box-shadow: 15px 15px 0 rgba(74, 124, 89, .15);
}
.bearing-label { margin-top: 22px; color: #37485d; font-family: var(--mono); font-size: 10px; font-weight: 800; text-align: center; }

.metrics { display: grid; grid-template-columns: repeat(4, minmax(120px, 1fr)); gap: 9px; }
.metric {
  min-width: 0;
  padding: 10px;
  border: 1px solid #d8e3ee;
  border-top: 3px solid var(--green);
  border-radius: 9px;
  background: var(--panel-strong);
  text-align: center;
}
.metric .k { color: var(--muted); font-family: var(--mono); font-size: 9px; font-weight: 750; letter-spacing: .04em; text-transform: uppercase; }
.metric .v { margin-top: 3px; color: var(--text); font-size: 20px; font-weight: 850; line-height: 1.25; font-variant-numeric: tabular-nums; }
.metric .s { margin-top: 2px; color: var(--muted); font-family: var(--mono); font-size: 9px; }

.bars { display: grid; gap: 9px; }
.bar-line { display: grid; grid-template-columns: 145px 1fr 76px; gap: 9px; align-items: center; }
.bar-label { color: #37485d; font-family: var(--mono); font-size: 10px; font-weight: 750; }
.bar-bg { height: 8px; overflow: hidden; border-radius: 4px; background: #d5dee9; }
.bar-fill { height: 100%; width: 0; border-radius: inherit; background: var(--ok); transition: width .25s ease; }
.bar-fill.bad { background: var(--bad); }
.bar-value { color: #475569; font-family: var(--mono); font-size: 10px; text-align: right; font-variant-numeric: tabular-nums; }

.warning-list { display: grid; gap: 7px; margin-top: 12px; }
.warning-item { padding: 7px 9px; border-radius: 7px; font-size: 11px; font-weight: 600; }
.warning-item.warn { background: var(--warn-bg); color: var(--warn); border: 1px solid #fed7aa; }
.warning-item.bad { background: var(--bad-bg); color: var(--bad); border: 1.5px solid #fca5a5; }
.warning-item.ok { background: var(--ok-bg); color: var(--ok); border: 1px solid #86efac; }

.table-wrap { overflow: auto; }
table {
  width: 100%;
  border-collapse: collapse;
  border: 0;
  background: var(--panel-strong);
  font-family: var(--mono);
  font-size: 10px;
}
th { padding: 7px 8px; border-bottom: 2px solid #d8e3ee; color: var(--muted); text-align: left; white-space: nowrap; }
td { padding: 7px 8px; border-bottom: 1px solid #e2e8f0; color: var(--text-2); font-variant-numeric: tabular-nums; }
tbody tr:hover { background: #edf4ee; }
tbody tr:last-child td { border-bottom: 0; }
.num { text-align: right; }
.governing { color: var(--green-dark); font-weight: 850; }
.select-link { padding: 2px 0; border: 0; background: transparent; color: var(--green-dark); font-family: var(--mono); font-size: 10px; font-weight: 850; cursor: pointer; }
.select-link:hover { text-decoration: underline; }

details { border-top: 1px solid #d8e3ee; }
details summary {
  padding: 10px 14px;
  background: rgba(248, 250, 252, .55);
  color: var(--green-dark);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .05em;
  text-transform: uppercase;
  cursor: pointer;
}
.formula {
  margin: 7px 0;
  padding: 8px 10px;
  overflow-x: auto;
  border: 1px solid #d8e3ee;
  border-radius: 7px;
  background: var(--panel-strong);
  color: var(--text-2);
  font-family: "Cambria Math", Cambria, Georgia, serif;
  font-size: 13px;
}
.empty { padding: 28px; color: var(--muted); font-family: var(--mono); font-size: 11px; text-align: center; }

#methodLimits .card-body p + p { margin-top: 9px; }

@media (max-width: 980px) {
  .layout { grid-template-columns: 1fr; }
  .inputs-column { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: start; }
  .result-hero { grid-template-columns: 1fr 190px; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  body { padding: 12px; }
  .header { align-items: flex-start; }
  .header-actions { width: 100%; margin-left: 48px; justify-content: flex-start; }
  .subtitle { margin-left: 0; padding-left: 48px; }
  .inputs-column { display: flex; }
  .result-hero { grid-template-columns: 1fr; }
  .bearing-figure { display: none; }
  .grid-3 { grid-template-columns: 1fr 1fr 1fr; }
}
@media (max-width: 520px) {
  .title-row { align-items: flex-start; }
  h1 { font-size: 21px; }
  .subtitle { padding-left: 0; margin-left: 48px; }
  .header-actions { margin-left: 0; }
  .status-chip { display: none; }
  .grid-2, .actions { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: 1fr 1fr; }
  .bar-line { grid-template-columns: 105px 1fr 62px; }
  .metric .v { font-size: 17px; }
}

@media print {
  body { padding: 0; background: #fff; }
  .app { max-width: none; }
  .header { margin-bottom: 12px; }
  .logo { color: #000; background: #fff; border: 1.5px solid #000; box-shadow: none; }
  .header-actions, .tabs, .inputs-column, .no-print, .alternatives-card { display: none !important; }
  .layout { display: block; }
  .card { margin-bottom: 10px; box-shadow: none; break-inside: avoid; }
  .notice { background: #fff; color: #333; border-color: #999; }
  .result-hero { min-height: auto; }
}