:root {
  --navy: #17365d;
  --ink: #172033;
  --muted: #5b6678;
  --line: #dce3eb;
  --soft: #f5f8fb;
  --accent: #2f6f9f;
  --success: #e8f3e5;
  --white: #ffffff;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.5;
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(10px);
}

.header-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  text-decoration: none;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--navy);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: .95rem;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
}

.hero {
  padding: 46px 0 20px;
  background: linear-gradient(180deg, #f8fbff 0%, #ffffff 100%);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-weight: 750;
  letter-spacing: .08em;
  text-transform: uppercase;
  font-size: .78rem;
}

h1, h2, h3 {
  color: var(--navy);
  letter-spacing: -0.025em;
}

h1 {
  margin: 0;
  font-size: clamp(2.35rem, 5vw, 4.7rem);
  line-height: 1.03;
  max-width: 900px;
}

h2 {
  margin: 0;
  font-size: clamp(1.7rem, 3vw, 2.6rem);
}

h3 {
  margin: 0;
  font-size: 1.15rem;
}

.lead {
  margin: 22px 0 28px;
  color: var(--muted);
  font-size: 1.12rem;
  max-width: 760px;
}

.primary-button, .secondary-button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 9px;
  padding: 0 16px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
}

.primary-button {
  color: var(--white);
  background: var(--navy);
  border: 1px solid var(--navy);
}

.secondary-button {
  color: var(--navy);
  background: var(--white);
  border: 1px solid var(--line);
}

.section { padding: 42px 0; }

.muted-section { background: var(--soft); }

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.field-block {
  display: grid;
  grid-template-rows: auto auto 1fr;
  gap: 5px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--white);
}

.field-label {
  color: var(--ink);
  font-weight: 700;
}

.field-help {
  min-height: 40px;
  color: var(--muted);
  font-size: .82rem;
  font-weight: 400;
}

input {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 10px;
  font: inherit;
  color: var(--ink);
  background: #fffbea;
}

input::placeholder {
  color: #9198a4;
}

input:focus, button:focus, a:focus {
  outline: 3px solid rgba(47,111,159,.2);
  outline-offset: 2px;
}

.arm-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  background: var(--soft);
}

.arm-card-heading {
  margin-bottom: 16px;
}

.arm-list {
  display: grid;
  gap: 18px;
}

.arm-entry {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  background: var(--white);
}

.arm-entry-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.arm-fields {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.remove-arm {
  border: 0;
  background: transparent;
  color: #8a2b2b;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
}

.calculator-actions {
  margin-top: 16px;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.summary-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
  background: var(--white);
}

.summary-card span, .summary-card small {
  display: block;
  color: var(--muted);
}

.summary-card strong {
  display: block;
  margin-top: 5px;
  color: var(--navy);
  font-size: 2rem;
}

.results-panel {
  margin-top: 30px;
}

.results-panel h3 {
  margin-bottom: 12px;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
}

table {
  width: 100%;
  min-width: 0;
  border-collapse: collapse;
  table-layout: fixed;
  font-size: .82rem;
}

.col-arm { width: 16%; }
.col-patients { width: 9%; }
.col-base-units { width: 18%; }
.col-base-bottles { width: 13%; }
.col-overage-bottles { width: 20%; }
.col-supplied { width: 24%; }

th, td {
  padding: 9px 8px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-align: right;
  vertical-align: middle;
  overflow-wrap: anywhere;
}

th:first-child, td:first-child { text-align: left; }

thead th {
  background: var(--navy);
  color: var(--white);
  font-weight: 750;
  line-height: 1.25;
  white-space: normal;
}

tbody tr:nth-child(even) { background: #fbfcfe; }

tfoot th, tfoot td {
  font-weight: 800;
  background: var(--success);
  color: var(--navy);
}

.validation {
  min-height: 1.5em;
  margin-top: 12px;
  color: #8a2b2b;
}

.methodology-grid, .about-grid {
  display: grid;
  grid-template-columns: minmax(220px,.75fr) minmax(0,1.25fr);
  gap: 50px;
}

.formula-list {
  display: grid;
  gap: 18px;
}

.formula-list > div {
  border-bottom: 1px solid var(--line);
  padding-bottom: 16px;
}

.formula-list p, .about-grid p {
  margin: 5px 0 0;
  color: var(--muted);
}

.disclaimer {
  margin-top: 24px !important;
  padding: 14px 16px;
  border-left: 4px solid var(--accent);
  background: var(--soft);
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 26px 0;
  color: var(--muted);
}

.site-footer .container {
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

@media (max-width: 900px) {
  table {
    min-width: 840px;
  }

  .arm-fields,
  .summary-grid,
  .methodology-grid,
  .about-grid {
    grid-template-columns: 1fr;
  }

  .field-help { min-height: 0; }

  .section-heading {
    align-items: stretch;
    flex-direction: column;
  }
}

@media (max-width: 540px) {
  .container { width: min(100% - 22px, 1120px); }
  .nav { gap: 10px; font-size: .86rem; }
  .site-footer .container { flex-direction: column; }
}


/* V1.4 multi-calculator navigation */
.tools-nav-section {
  padding: 18px 0 0;
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

.tool-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tool-tab {
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-bottom: 0;
  border-radius: 10px 10px 0 0;
  background: var(--soft);
  color: var(--muted);
  font: inherit;
  font-weight: 750;
  cursor: pointer;
}

.tool-tab.active {
  background: var(--navy);
  border-color: var(--navy);
  color: var(--white);
}

.calculator-view[hidden] {
  display: none;
}

.calculator-intro {
  padding-bottom: 12px;
}

.calculator-section {
  padding-top: 28px;
}

.tool-lead {
  margin: 12px 0 0;
  max-width: 800px;
  color: var(--muted);
  font-size: 1.05rem;
}

.site-about {
  border-top: 1px solid var(--line);
}

/* Patient Numbers calculator */
.patient-calculator-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, .65fr);
  gap: 28px;
  align-items: start;
}

.patient-input-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.patient-results {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  background: var(--soft);
}

.patient-result-card {
  margin-top: 12px;
  padding: 17px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--white);
}

.patient-result-card span,
.patient-result-card small {
  display: block;
  color: var(--muted);
}

.patient-result-card strong {
  display: block;
  margin: 4px 0 2px;
  color: var(--navy);
  font-size: 2.25rem;
}

.primary-result {
  border-color: #b9cde0;
}

.patient-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 8px;
  align-items: center;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.patient-flow > div {
  min-width: 0;
  text-align: center;
}

.patient-flow span {
  display: block;
  color: var(--muted);
  font-size: .78rem;
}

.patient-flow strong {
  display: block;
  color: var(--navy);
  font-size: 1.15rem;
}

.flow-arrow {
  color: var(--accent) !important;
  font-size: 1.2rem !important;
}

.formula-note {
  margin-top: 5px !important;
  font-size: .9rem;
}

@media (max-width: 900px) {
  .patient-calculator-layout,
  .patient-input-grid {
    grid-template-columns: 1fr;
  }

  .patient-results {
    order: 2;
  }
}

@media (max-width: 540px) {
  .tool-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .tool-tab {
    padding: 0 8px;
    font-size: .9rem;
  }

  .patient-flow {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .flow-arrow {
    display: none;
  }
}


/* V1.6 Study Duration calculator */
.duration-calculator-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, .65fr);
  gap: 28px;
  align-items: start;
}
.duration-input-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.duration-results {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  background: var(--soft);
}
.duration-result-list { display: grid; gap: 12px; }
.duration-result-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--white);
}
.duration-result-card span, .duration-result-card small { display: block; color: var(--muted); }
.duration-result-card strong { display: block; margin-top: 4px; color: var(--navy); font-size: 1.45rem; }
@media (max-width: 900px) {
  .duration-calculator-layout, .duration-input-grid { grid-template-columns: 1fr; }
}
@media (max-width: 540px) {
  .tool-tabs { grid-template-columns: 1fr; }
  .duration-result-card strong { font-size: 1.3rem; }
}


/* V1.7 Recruitment calculator */
select {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 10px;
  font: inherit;
  color: var(--ink);
  background: var(--white);
}

select:focus {
  outline: 3px solid rgba(47,111,159,.2);
  outline-offset: 2px;
}

.recruitment-calculator-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, .65fr);
  gap: 28px;
  align-items: start;
}

.recruitment-calc-select {
  max-width: 520px;
  margin-bottom: 16px;
}

.recruitment-input-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.recruitment-results {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  background: var(--soft);
}

.recruitment-result-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--white);
}

.recruitment-result-card span,
.recruitment-result-card small {
  display: block;
  color: var(--muted);
}

.recruitment-result-card strong {
  display: block;
  margin: 4px 0 2px;
  color: var(--navy);
  font-size: 2.3rem;
}

.recruitment-formula-summary {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.recruitment-formula-summary h3 {
  font-size: .95rem;
}

.recruitment-formula-summary p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: .9rem;
}

.recruitment-link-button {
  width: 100%;
  margin-top: 16px;
}

.field-block.is-calculated {
  background: var(--soft);
}

.field-block.is-calculated input {
  background: #edf2f6;
  color: var(--muted);
}

@media (max-width: 900px) {
  .recruitment-calculator-layout,
  .recruitment-input-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 540px) {
  .tool-tabs {
    grid-template-columns: 1fr 1fr;
  }

  .recruitment-result-card strong {
    font-size: 1.9rem;
  }
}

/* Recruitment ramp input and caveat */
.recruitment-activation-field { margin-top: 14px; }
.recruitment-activation-field .field-help { min-height: 0; }
.recruitment-timeline-note { margin: 15px 0 0; font-size: .87rem; line-height: 1.5; color: var(--muted); }
.ramp-summary { font-weight: 650; color: var(--navy) !important; }

/* V2: distinct, crawlable pages; navigation keeps the original visual style. */
.tool-tab {display:inline-flex; align-items:center; justify-content:center; text-decoration:none;}
.tool-tab:hover {color:var(--navy);}
.tool-tab.active:hover {color:var(--white);}
.tool-tabs {align-items:stretch;}
.calculator-view[hidden] {display:block;}
.home-tools {padding:42px 0 58px;}
.home-tool-grid {display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;}
.home-tool {display:block;border:1px solid var(--line);border-radius:12px;padding:22px;text-decoration:none;min-width:0;}
.home-tool h2 {font-size:1.35rem;margin:0 0 8px;}
.home-tool p {margin:0;color:var(--muted);}
.home-tool:hover {background:var(--soft);border-color:var(--accent);}
@media(max-width:650px) {.home-tool-grid {grid-template-columns:1fr;} .tool-tab {min-width:0;}}

.page-title {font-size:clamp(1.85rem,3.8vw,3rem);line-height:1.13;}

/* V2.1: visible Home link, with compact navigation on narrow phones. */
.nav a[aria-current="page"] { color: var(--navy); font-weight: 750; }
@media (max-width: 400px) {
  .header-inner { gap: 8px; }
  .brand { font-size: 1.16rem; }
  .nav { gap: 8px; font-size: .79rem; }
}

/* Advanced recruitment forecast, V2.3 */
.recruitment-modes{display:flex;gap:9px;flex-wrap:wrap;margin-top:23px;}
.recruitment-modes a{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:9px 17px;text-decoration:none;color:var(--navy);border:1px solid var(--line);border-radius:9px;background:white;font-weight:700;}
.recruitment-modes a.selected{background:var(--navy);border-color:var(--navy);color:#fff;}
.advanced-main-inputs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:18px 0 29px;}
.advanced-actions{display:flex;gap:9px;flex-wrap:wrap;}
.advanced-hint,.advanced-small{font-size:.88rem;color:var(--muted);}
.advanced-tiers{border-top:1px solid var(--line);padding-top:22px;}
.advanced-tiers>p,.advanced-method p{color:var(--muted);line-height:1.65;}
.advanced-tiers strong,.advanced-method strong{color:var(--ink);}
.advanced-tier-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:16px 0;}
.advanced-tier{min-width:0;padding:15px;border:1px solid var(--line);border-radius:13px;background:var(--soft);display:grid;align-content:start;gap:11px;}
.advanced-tier h4{font-size:1.02rem;color:var(--navy);margin:0;}
.advanced-tier .field-block{padding:11px;gap:5px;grid-template-rows:auto 1fr;}
.advanced-tier .field-label{font-size:.83rem;min-height:35px;}
.advanced-status{min-height:1.5em;margin:20px 0;}
.advanced-visuals[hidden]{display:none;}
.advanced-kpis{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px;margin:18px 0 26px;}
.advanced-kpis .recruitment-result-card strong{font-size:clamp(1.5rem,2.8vw,2.15rem);overflow-wrap:anywhere;}
.advanced-chart{padding:19px;border:1px solid var(--line);border-radius:13px;}
.advanced-chart>p{color:var(--muted);font-size:.87rem;}
.advanced-svg{width:100%;overflow:hidden;}
.advanced-svg svg{width:100%;display:block;height:auto;}
.advanced-details{margin:18px 0 0;border:1px solid var(--line);border-radius:10px;padding:14px;}
.advanced-details summary{cursor:pointer;font-weight:700;color:var(--navy);}
.advanced-table-scroll{max-width:100%;overflow:auto;margin-top:15px;}
.advanced-table{width:100%;border-collapse:collapse;font-size:.85rem;font-variant-numeric:tabular-nums;white-space:nowrap;}
.advanced-table caption{text-align:left;color:var(--muted);margin:0 0 8px;}
.advanced-table th{background:var(--navy);color:#fff;text-align:right;white-space:normal;min-width:90px;}
.advanced-table td{text-align:right;}
.advanced-table th,.advanced-table td{padding:9px 11px;border-bottom:1px solid var(--line);}
.advanced-table tbody tr:nth-child(even){background:var(--soft);}
@media(max-width:900px){.advanced-main-inputs,.advanced-tier-grid{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media(max-width:600px){.advanced-main-inputs,.advanced-tier-grid,.advanced-kpis{grid-template-columns:minmax(0,1fr);}.advanced-actions{width:100%;}.advanced-actions button{flex:1;}.advanced-tier .field-label{min-height:0;}.advanced-chart{padding:8px;}}

.advanced-status[data-state="ready"]{color:#27613b;}
.advanced-status[data-state="warning"]{color:#985e11;}

/* Advanced recruitment V2.5: separate site-activation chart */
.advanced-activation-chart{margin-top:16px;}
.advanced-chart h3{margin-top:0;}
.advanced-main-inputs .field-block{min-width:0;}