:root {
  --ink: #18302b;
  --muted: #61706c;
  --line: #d8e2de;
  --soft: #f3f7f5;
  --accent: #276a5c;
  --accent-dark: #174c42;
  --accent-light: #dcece7;
  --warning: #9a621b;
  --warning-bg: #fff5df;
  --danger: #9a3434;
  --danger-bg: #fff0f0;
  --white: #ffffff;
  --shadow: 0 14px 34px rgba(26, 61, 53, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: #edf3f0; font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
[hidden] { display: none !important; }

.app-shell { width: min(1240px, calc(100% - 32px)); margin: 28px auto 56px; }
.compact-hero { margin-bottom: 20px; }
.hero-rule { min-width: 260px; }
.mode-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-bottom: 24px; }
.mode-card { text-align: left; border: 1px solid var(--line); background: var(--white); border-radius: 16px; padding: 22px; min-height: 154px; box-shadow: var(--shadow); color: var(--ink); transition: .18s ease; }
.mode-card:hover, .mode-card.active { transform: translateY(-2px); border-color: var(--accent); box-shadow: 0 16px 36px rgba(26, 61, 53, .14); }
.mode-card.active { background: linear-gradient(145deg, #fff, var(--accent-light)); }
.mode-card strong { display: block; font-size: 1.12rem; margin: 9px 0 8px; }
.mode-card small { color: var(--muted); line-height: 1.45; }
.mode-index { display: inline-flex; width: 36px; height: 30px; align-items: center; justify-content: center; border-radius: 999px; background: var(--accent-light); color: var(--accent-dark); font-weight: 800; font-size: .8rem; }


.side-nav {
  position: sticky;
  top: 102px;
  display: grid;
  gap: 6px;
  padding: 16px 12px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255,255,255,.92);
  box-shadow: var(--shadow);
}
.side-nav-title {
  padding: 0 9px 8px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.side-nav a {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 5px;
  align-items: center;
  padding: 9px;
  border-radius: 10px;
  color: #52645f;
  font-size: 13px;
  font-weight: 750;
  text-decoration: none;
}
.side-nav a:hover { background: var(--accent-light); color: var(--accent-dark); }
.side-nav span { color: var(--accent); font-weight: 900; }

.workspace-grid { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 22px; align-items: start; }
.main-column { min-width: 0; }
.panel { background: var(--white); border: 1px solid var(--line); border-radius: 16px; padding: 24px; margin-bottom: 18px; box-shadow: var(--shadow); }
.panel-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; margin-bottom: 18px; }
.panel-heading-group { display: flex; align-items: center; gap: 12px; min-width: 0; }
.panel-step-badge { display: inline-flex; align-items: center; justify-content: center; min-width: 42px; height: 32px; padding: 0 10px; border-radius: 12px; background: #d8e9e4; border: 1px solid #c4ddd5; color: var(--accent-dark); font-size: .88rem; font-weight: 900; line-height: 1; box-shadow: inset 0 1px 0 rgba(255,255,255,.7); }
.panel-heading h2 { margin: 2px 0 0; font-size: 1.4rem; }
.panel-heading p { margin: 0; }
.section-note { color: var(--muted); line-height: 1.55; margin: -6px 0 18px; }

.choice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.choice-card { position: relative; display: block; border: 1px solid var(--line); background: var(--soft); border-radius: 13px; padding: 16px; cursor: pointer; }
.choice-card input { position: absolute; opacity: 0; pointer-events: none; }
.choice-card strong { display: block; margin-bottom: 4px; }
.choice-card small { color: var(--muted); line-height: 1.4; }
.choice-card:has(input:checked) { border-color: var(--accent); background: var(--accent-light); box-shadow: inset 0 0 0 1px var(--accent); }

.input-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.input-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.input-grid.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
label.field { display: grid; gap: 7px; color: var(--ink); font-weight: 650; }
label.field span { font-size: .9rem; display: block; min-height: 2.8em; }
.field-help { color: var(--muted); font-size: .84rem; font-weight: 400; line-height: 1.4; }
input, select, textarea { width: 100%; border: 1px solid #c9d5d0; border-radius: 10px; padding: 10px 11px; background: #fff; color: var(--ink); }
input:focus, select:focus, textarea:focus { outline: 3px solid rgba(39, 106, 92, .14); border-color: var(--accent); }

.subpanel { border: 1px solid var(--line); background: #fbfdfc; border-radius: 14px; padding: 18px; margin-top: 16px; }
.subpanel h3 { margin: 0 0 12px; font-size: 1.04rem; }
.subpanel p { color: var(--muted); }
.inline-choice { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 14px; }
.inline-choice label { display: inline-flex; gap: 8px; align-items: center; border: 1px solid var(--line); border-radius: 999px; padding: 8px 12px; background: #fff; cursor: pointer; }
.inline-choice input { width: auto; }

.inventory-toolbar { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; align-items: center; margin-bottom: 12px; }
.inventory-table { width: 100%; border-collapse: collapse; }
.inventory-table th, .inventory-table td { padding: 9px 8px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
.inventory-table th { font-size: .82rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.inventory-table input, .inventory-table select { padding: 8px 9px; }
.inventory-table .small-input { width: 110px; }
.icon-button { border: 0; background: transparent; color: var(--danger); font-weight: 800; padding: 7px; }
.add-button { border: 1px solid var(--accent); background: #fff; color: var(--accent-dark); border-radius: 9px; padding: 8px 12px; font-weight: 750; }
.inventory-summary { display: flex; justify-content: space-between; gap: 16px; align-items: center; padding: 12px 14px; background: var(--accent-light); border-radius: 11px; margin-top: 12px; }
.inventory-summary strong { font-size: 1.2rem; }

.estimated-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.estimated-card { border: 1px solid var(--line); background: #fff; border-radius: 12px; padding: 12px; display: grid; grid-template-columns: auto 1fr; gap: 9px; align-items: start; }
.estimated-card input { width: auto; margin-top: 3px; }
.estimated-card strong { display: block; font-size: .92rem; }
.estimated-card span { display: block; color: var(--accent-dark); font-weight: 800; margin-top: 3px; }
.estimated-card small { display: block; color: var(--muted); margin-top: 2px; }

.flow-preview { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin-top: 14px; }
.flow-box { border: 1px solid var(--line); border-radius: 12px; padding: 12px; background: var(--soft); }
.flow-box strong { display: block; }
.flow-box span { font-size: 1.15rem; font-weight: 800; color: var(--accent-dark); }

.form-actions { display: flex; gap: 10px; justify-content: flex-end; margin: 4px 0 18px; }
.primary-button, .secondary-button { border-radius: 10px; padding: 11px 16px; font-weight: 800; }
.primary-button { border: 1px solid var(--accent); background: var(--accent); color: #fff; }
.primary-button:hover { background: var(--accent-dark); }
.secondary-button { border: 1px solid var(--line); background: #fff; color: var(--ink); }
.form-message { padding: 12px 14px; border-radius: 10px; background: var(--danger-bg); color: var(--danger); font-weight: 700; }

.result-hero { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 18px; margin-bottom: 18px; }
.result-number { border-radius: 16px; padding: 22px; color: #fff; background: linear-gradient(145deg, var(--accent), var(--accent-dark)); display: grid; align-content: center; min-height: 150px; }
.result-number strong { font-size: clamp(2.4rem, 6vw, 4.4rem); line-height: .95; }
.result-number span { margin-top: 9px; font-weight: 750; }
.result-explanation { border: 1px solid var(--line); background: var(--soft); border-radius: 16px; padding: 20px; }
.result-explanation h3 { margin-top: 0; }
.result-explanation p { color: var(--muted); line-height: 1.6; }
.result-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.result-card { border: 1px solid var(--line); border-radius: 14px; padding: 17px; background: #fff; }
.result-card.wide { grid-column: 1 / -1; }
.result-card h3 { margin: 0 0 12px; font-size: 1rem; }
.result-card dl { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px 14px; margin: 0; }
.result-card dt { color: var(--muted); }
.result-card dd { margin: 0; font-weight: 800; text-align: right; }
.warning-list { margin: 0; padding-left: 20px; color: var(--warning); }
.warning-list li { margin-bottom: 8px; line-height: 1.45; }
.warning-list .ok { color: var(--accent-dark); }
.allocation-note { margin: -4px 0 12px; color: var(--muted); line-height: 1.45; }
.allocation-chart { display: grid; gap: 10px; margin-top: 16px; }
.allocation-bar-row { display: grid; grid-template-columns: minmax(140px, 220px) 1fr 56px; gap: 10px; align-items: center; }
.allocation-bar-label { font-weight: 650; }
.allocation-bar-track { height: 14px; border-radius: 999px; background: var(--accent-light); overflow: hidden; }
.allocation-bar-fill { height: 100%; border-radius: 999px; background: linear-gradient(90deg, var(--accent), var(--accent-dark)); }
.allocation-bar-value { text-align: right; font-weight: 800; }

.allocation-table { width: 100%; border-collapse: collapse; }
.allocation-table th, .allocation-table td { border-bottom: 1px solid var(--line); padding: 8px; text-align: left; }
.report-text { min-height: 180px; line-height: 1.5; }
.formula-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.formula-figure { margin: 0; display: grid; gap: 10px; }
.formula-figure img { width: 100%; display: block; border-radius: 14px; background: #fff; border: 1px solid #d8d8d8; box-shadow: 0 8px 20px rgba(8,18,16,.06); }
.formula-figure figcaption { display: grid; gap: 4px; padding: 0 2px; }
.formula-figure figcaption strong { font-size: 1rem; color: var(--accent-dark); }
.formula-figure figcaption span { color: var(--muted); line-height: 1.45; }
.formula-note-card { padding: 18px; border-radius: 16px; border: 1px solid var(--line); background: #fff; display: grid; gap: 8px; }
.formula-note-card p { margin: 0; color: var(--muted); line-height: 1.5; }
.formula-grid { align-items: start; }
.formula-figure { align-content: start; }
.formula-where { margin-top: 8px; padding: 10px 12px; border-radius: 12px; background: #f7faf9; border: 1px solid var(--line); }
.formula-where strong { display: block; margin-bottom: 6px; color: var(--accent-dark); font-size: .92rem; }
.formula-where ul { margin: 0; padding-left: 18px; color: var(--muted); }
.formula-where li { margin: 4px 0; line-height: 1.4; }

.result-actions { display: flex; gap: 8px; margin-top: 10px; }
.funnel { display: grid; gap: 7px; }
.funnel-stage { border-radius: 8px; padding: 9px 12px; color: #fff; background: var(--accent); text-align: center; margin-inline: auto; }
.flow-visual { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.flow-node { min-width: 165px; padding: 14px 16px; border-radius: 16px; background: linear-gradient(180deg, #f7fbf9, #eef6f3); border: 1px solid var(--line); box-shadow: inset 0 1px 0 rgba(255,255,255,.7); display: grid; gap: 6px; }
.flow-node small { color: var(--muted); font-weight: 700; text-transform: uppercase; letter-spacing: .05em; }
.flow-node strong { color: var(--accent-dark); font-size: 1rem; }
.flow-arrow { color: var(--accent); font-size: 1.4rem; font-weight: 900; }

.method-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.method-grid article { border: 1px solid var(--line); border-radius: 12px; padding: 15px; background: var(--soft); }
.method-grid h3 { margin: 0 0 7px; font-size: 1rem; }
.method-grid p { margin: 0; color: var(--muted); line-height: 1.5; }
.reference-box { margin-top: 14px; border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.reference-box summary { font-weight: 800; cursor: pointer; }
.reference-box li { margin: 8px 0; color: var(--muted); }

@media (max-width: 980px) {
  .mode-grid { grid-template-columns: 1fr; }
  .workspace-grid { grid-template-columns: 1fr; }
  .side-nav { display: none; }
  .input-grid, .input-grid.four, .estimated-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .result-hero { grid-template-columns: 1fr; }
  .allocation-bar-row { grid-template-columns: 1fr; }
  .formula-grid { grid-template-columns: 1fr; }
  .flow-visual { flex-direction: column; align-items: stretch; }
  .flow-arrow { align-self: center; transform: rotate(90deg); }
  .allocation-bar-value { text-align: left; }
}
@media (max-width: 640px) {
  .app-shell { width: min(100% - 18px, 1240px); margin-top: 16px; }
  .panel, .mode-card { padding: 17px; }
  .choice-grid, .input-grid, .input-grid.two, .input-grid.four, .estimated-grid, .result-grid, .method-grid, .flow-preview, .formula-grid { grid-template-columns: 1fr; }
  .form-actions, .result-actions { flex-direction: column; }
  .inventory-table { display: block; overflow-x: auto; white-space: nowrap; }
}

@media print {
  .site-header, .site-footer, .mode-grid, .side-nav, #study-panel, #population-panel, #diagnostic-panel, .form-actions, #methods-panel, .result-actions { display: none !important; }
  body { background: #fff; }
  .app-shell, .workspace-grid { width: 100%; display: block; margin: 0; }
  #results-panel { display: block !important; border: 0; box-shadow: none; }
}