:root {
  --ink: #08090A;
  --ink-2: #0E0C09;
  --ink-3: #110F0C;
  --vellum: #e8e2d0;
  --vellum-dim: rgba(232,226,208,0.78);
  --vellum-faint: rgba(232,226,208,0.45);
  --gold: #B8956A;
  --gold-bright: #D4B380;
  --cyan: #5A8DA3;
  --cyan-bright: #7AAEC4;
  --oxblood: #7A2820;
  --green: #5c8a4d;
  --hairline: rgba(184,149,106,0.18);
  --serif: 'Cormorant Garamond', Georgia, serif;
  --mono: 'IBM Plex Mono', 'Courier New', monospace;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { background: var(--ink); color: var(--vellum); font-family: var(--serif); font-size: 18px; line-height: 1.55; }

/* Masthead */
.mast { padding: 20px 32px; border-bottom: 1px solid var(--hairline); display: flex; justify-content: space-between; align-items: center; }
.mast a { color: var(--vellum); text-decoration: none; }
.mast-brand { font-family: var(--mono); font-size: 11px; letter-spacing: 0.4em; color: var(--gold); text-transform: uppercase; font-weight: 700; }
.mast-nav { font-family: var(--mono); font-size: 10px; letter-spacing: 0.3em; text-transform: uppercase; }
.mast-nav a { margin-left: 24px; color: var(--vellum-dim); }

/* Breadcrumb */
.crumb { max-width: 1200px; margin: 0 auto; padding: 22px 32px 0; font-family: var(--mono); font-size: 10px; letter-spacing: 0.3em; text-transform: uppercase; color: var(--vellum-faint); }
.crumb a { color: var(--cyan-bright); text-decoration: none; }
.crumb span { margin: 0 10px; color: var(--vellum-faint); }

/* Hero */
.protocol-hero { max-width: 1200px; margin: 0 auto; padding: 40px 32px 32px; border-bottom: 1px solid var(--hairline); display: grid; grid-template-columns: 1fr 320px; gap: 60px; align-items: end; }

.hero-meta { font-family: var(--mono); font-size: 10px; letter-spacing: 0.4em; color: var(--cyan-bright); text-transform: uppercase; font-weight: 700; margin-bottom: 14px; }
.hero-title { font-family: var(--serif); font-size: 72px; line-height: 0.98; font-weight: 500; color: var(--vellum); letter-spacing: -0.005em; margin-bottom: 14px; }
.hero-title em { color: var(--cyan-bright); font-style: italic; }
.hero-formula { font-family: var(--mono); font-size: 13px; letter-spacing: 0.18em; color: var(--gold-bright); margin-bottom: 22px; }
.hero-summary { font-family: var(--serif); font-style: italic; font-size: 22px; color: var(--vellum-dim); line-height: 1.45; max-width: 680px; }

.tier-card {
  background: var(--ink-2);
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--green);
  padding: 24px 22px;
}
.tier-card-mark { font-family: var(--mono); font-size: 10px; letter-spacing: 0.4em; color: var(--green); text-transform: uppercase; font-weight: 700; margin-bottom: 8px; }
.tier-card-name { font-family: var(--serif); font-size: 22px; font-weight: 500; margin-bottom: 8px; color: var(--vellum); }
.tier-card-desc { font-family: var(--serif); font-style: italic; font-size: 14px; color: var(--vellum-dim); line-height: 1.5; }
.tier-card-stats { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--hairline); display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.tier-card-stat-label { font-family: var(--mono); font-size: 9px; letter-spacing: 0.3em; color: var(--vellum-faint); text-transform: uppercase; font-weight: 700; margin-bottom: 4px; }
.tier-card-stat-value { font-family: var(--serif); font-size: 14px; color: var(--vellum); }

/* Quick reference table */
.quickref {
  max-width: 1200px;
  margin: 36px auto;
  padding: 0 32px;
}
.quickref-grid {
  background: var(--ink-2);
  border: 1px solid var(--hairline);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.quickref-cell {
  padding: 22px 24px;
  border-right: 1px solid var(--hairline);
}
.quickref-cell:last-child { border-right: none; }
.quickref-label { font-family: var(--mono); font-size: 9px; letter-spacing: 0.4em; color: var(--cyan-bright); text-transform: uppercase; font-weight: 700; margin-bottom: 8px; }
.quickref-value { font-family: var(--serif); font-size: 24px; font-weight: 500; color: var(--vellum); line-height: 1.1; margin-bottom: 4px; }
.quickref-note { font-family: var(--serif); font-style: italic; font-size: 13px; color: var(--vellum-dim); line-height: 1.4; }

/* Article body */
.article { max-width: 920px; margin: 0 auto; padding: 24px 32px 80px; }
.article h2 { font-family: var(--serif); font-size: 36px; font-weight: 500; color: var(--vellum); margin: 60px 0 10px; letter-spacing: -0.005em; line-height: 1.1; }
.article h2 em { color: var(--cyan-bright); font-style: italic; }
.article h2:first-child { margin-top: 24px; }
.article h2 .section-num { font-family: var(--mono); font-size: 11px; letter-spacing: 0.4em; color: var(--gold-bright); text-transform: uppercase; font-weight: 700; display: block; margin-bottom: 6px; }
.article h3 { font-family: var(--serif); font-size: 22px; font-weight: 500; color: var(--gold-bright); margin: 32px 0 8px; font-style: italic; }
.article p { font-family: var(--serif); font-size: 18px; color: var(--vellum); line-height: 1.65; margin-bottom: 18px; }
.article p em { color: var(--gold-bright); font-style: italic; }
.article ul, .article ol { font-family: var(--serif); font-size: 18px; color: var(--vellum); line-height: 1.6; margin: 0 0 22px 24px; }
.article li { margin-bottom: 8px; }
.article a.cite { font-family: var(--mono); font-size: 11px; color: var(--cyan-bright); text-decoration: none; padding: 0 2px; vertical-align: super; }
.article a.cite:hover { color: var(--gold-bright); }

.callout {
  margin: 28px 0;
  padding: 24px 28px;
  background: var(--ink-2);
  border-left: 3px solid var(--cyan);
}
.callout-mark { font-family: var(--mono); font-size: 10px; letter-spacing: 0.4em; color: var(--cyan-bright); text-transform: uppercase; font-weight: 700; margin-bottom: 6px; }
.callout p { font-family: var(--serif); font-style: italic; font-size: 17px; color: var(--vellum-dim); margin-bottom: 0; line-height: 1.55; }

.warning {
  margin: 28px 0;
  padding: 22px 26px;
  background: rgba(125,42,42,0.08);
  border: 1px solid var(--oxblood);
  border-left: 3px solid var(--oxblood);
}
.warning-mark { font-family: var(--mono); font-size: 10px; letter-spacing: 0.4em; color: var(--oxblood); text-transform: uppercase; font-weight: 700; margin-bottom: 6px; }

.protocol-block {
  margin: 28px 0;
  padding: 26px 28px;
  background: var(--ink-2);
  border: 1px solid var(--hairline);
  border-top: 2px solid var(--cyan-bright);
}
.protocol-block-mark { font-family: var(--mono); font-size: 10px; letter-spacing: 0.4em; color: var(--cyan-bright); text-transform: uppercase; font-weight: 700; margin-bottom: 14px; }
.protocol-block h4 { font-family: var(--serif); font-size: 20px; color: var(--vellum); margin: 14px 0 6px; font-style: italic; }
.protocol-block h4:first-of-type { margin-top: 0; }

/* Citations */
.citations { max-width: 920px; margin: 60px auto 0; padding: 32px; background: var(--ink-2); border: 1px solid var(--hairline); }
.citations h2 { font-family: var(--serif); font-size: 28px; font-weight: 500; color: var(--vellum); margin-bottom: 22px; }
.citations h2 .section-num { font-family: var(--mono); font-size: 10px; letter-spacing: 0.4em; color: var(--gold-bright); text-transform: uppercase; display: block; margin-bottom: 4px; }
.citations ol { margin: 0; padding: 0; list-style: none; counter-reset: cite; }
.citations li {
  counter-increment: cite;
  padding: 14px 0 14px 44px;
  border-top: 1px solid var(--hairline);
  font-family: var(--serif);
  font-size: 14px;
  line-height: 1.55;
  color: var(--vellum-dim);
  position: relative;
}
.citations li:first-child { border-top: none; padding-top: 0; }
.citations li::before {
  content: "[" counter(cite) "]";
  position: absolute;
  left: 0;
  top: 14px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--cyan-bright);
  font-weight: 700;
}
.citations li:first-child::before { top: 0; }
.citations li em { color: var(--vellum); }
.citations li a { color: var(--cyan-bright); text-decoration: none; font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; }
.citations li a:hover { color: var(--gold-bright); }

.back-row { max-width: 920px; margin: 40px auto; padding: 0 32px; text-align: center; }
.btn-back {
  display: inline-block;
  padding: 14px 32px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--cyan-bright);
  border: 1px solid var(--cyan);
  text-decoration: none;
  transition: all 0.2s;
}
.btn-back:hover { background: var(--cyan); color: var(--ink); }

.foot { padding: 40px 24px; text-align: center; border-top: 1px solid var(--hairline); font-family: var(--mono); font-size: 9px; letter-spacing: 0.35em; color: var(--vellum-faint); text-transform: uppercase; margin-top: 40px; }

@media (max-width: 880px) {
  .protocol-hero { grid-template-columns: 1fr; gap: 32px; padding: 32px 24px; }
  .hero-title { font-size: 52px; }
  .quickref-grid { grid-template-columns: 1fr 1fr; }
  .quickref-cell { border-right: none; border-bottom: 1px solid var(--hairline); }
  .quickref-cell:nth-child(2) { border-right: none; }
  .article { padding: 20px 22px 60px; }
  .article h2 { font-size: 28px; }
  .article p, .article ul, .article ol { font-size: 17px; }
  .mast { padding: 14px 18px; }
  .mast-nav a { margin-left: 14px; }
  .crumb { padding: 18px 22px 0; }
}
/* === FIGURE / VISUAL BLOCKS === */
.figure {
  margin: 32px 0;
  background: var(--ink-2);
  border: 1px solid var(--hairline);
  padding: 28px 28px 22px;
}
.figure-eyebrow {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.4em;
  color: var(--cyan-bright);
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 4px;
}
.figure-title {
  font-family: var(--serif);
  font-size: 20px;
  font-style: italic;
  color: var(--vellum);
  margin-bottom: 14px;
  line-height: 1.3;
}
.figure-svg {
  width: 100%;
  height: auto;
  display: block;
  margin: 14px 0;
}
.figure-caption {
  font-family: var(--serif);
  font-style: italic;
  font-size: 14px;
  color: var(--vellum-dim);
  line-height: 1.5;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--hairline);
}
.figure-caption strong { color: var(--gold-bright); font-style: normal; font-weight: 500; }
.figure-source {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.25em;
  color: var(--vellum-faint);
  text-transform: uppercase;
  margin-top: 8px;
}
.figure-source a { color: var(--cyan-bright); text-decoration: none; }

/* Compact bar comparison for forms */
.bar-compare {
  display: grid;
  grid-template-columns: 120px 1fr 50px;
  gap: 10px;
  align-items: center;
  padding: 9px 0;
  font-family: var(--serif);
  font-size: 14px;
}
.bar-compare-label { color: var(--vellum); }
.bar-compare-bar-shell { height: 14px; background: var(--ink-3); border: 1px solid var(--hairline); position: relative; }
.bar-compare-bar { height: 100%; background: linear-gradient(90deg, var(--cyan), var(--cyan-bright)); }
.bar-compare-bar.poor { background: linear-gradient(90deg, var(--oxblood), #c47a72); }
.bar-compare-bar.fair { background: linear-gradient(90deg, var(--gold), var(--gold-bright)); }
.bar-compare-value { font-family: var(--mono); font-size: 12px; color: var(--gold-bright); text-align: right; }

/* === INTERACTIVE CALCULATOR === */
.calc {
  margin: 36px 0;
  background: var(--ink-2);
  border: 1px solid var(--hairline);
  border-top: 2px solid var(--cyan-bright);
  padding: 28px 30px;
}
.calc-eyebrow {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.45em;
  color: var(--cyan-bright);
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 4px;
}
.calc-title {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 500;
  color: var(--vellum);
  line-height: 1.15;
  margin-bottom: 6px;
  letter-spacing: 0.005em;
}
.calc-title em { color: var(--cyan-bright); font-style: italic; }
.calc-sub {
  font-family: var(--serif);
  font-style: italic;
  font-size: 14px;
  color: var(--vellum-dim);
  line-height: 1.5;
  margin-bottom: 22px;
}

.calc-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 14px;
  margin-bottom: 22px;
}
.calc-field { display: flex; flex-direction: column; }
.calc-field-label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.3em;
  color: var(--vellum-faint);
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 6px;
}
.calc-field input,
.calc-field select {
  background: var(--ink-3);
  border: 1px solid var(--hairline);
  color: var(--vellum);
  font-family: var(--serif);
  font-size: 17px;
  padding: 11px 13px;
  outline: none;
  transition: border-color 0.15s;
  width: 100%;
}
.calc-field input:focus,
.calc-field select:focus { border-color: var(--cyan); }
.calc-field-hint {
  font-family: var(--serif);
  font-style: italic;
  font-size: 12px;
  color: var(--vellum-faint);
  margin-top: 4px;
  line-height: 1.3;
}

.calc-quick {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}
.calc-quick-label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.3em;
  color: var(--vellum-faint);
  text-transform: uppercase;
  font-weight: 700;
  align-self: center;
  margin-right: 4px;
}
.calc-quick-btn {
  padding: 6px 12px;
  background: var(--ink-3);
  border: 1px solid var(--hairline);
  color: var(--vellum-dim);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.15s;
  font-weight: 700;
}
.calc-quick-btn:hover {
  border-color: var(--cyan);
  color: var(--cyan-bright);
}

.calc-result-bar {
  background: var(--ink-3);
  border: 1px solid var(--hairline);
  padding: 18px 22px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 18px;
  margin-bottom: 20px;
}
.calc-result {
  text-align: center;
}
.calc-result-label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.3em;
  color: var(--vellum-faint);
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 6px;
}
.calc-result-value {
  font-family: var(--serif);
  font-size: 32px;
  font-weight: 500;
  color: var(--gold-bright);
  line-height: 1;
}
.calc-result-value.warn { color: #c47a72; }
.calc-result-value.ok { color: #5c8a4d; }
.calc-result-unit {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--vellum-faint);
  letter-spacing: 0.15em;
  margin-top: 4px;
  text-transform: uppercase;
}

.calc-svg { width: 100%; height: auto; display: block; }

.calc-verdict {
  margin-top: 20px;
  padding: 16px 20px;
  border-left: 3px solid var(--gold-bright);
  background: rgba(184,149,106,0.08);
  font-family: var(--serif);
  font-style: italic;
  font-size: 15px;
  color: var(--vellum);
  line-height: 1.55;
  transition: all 0.2s;
}
.calc-verdict.warn { border-left-color: #c47a72; background: rgba(196,122,114,0.08); }
.calc-verdict.ok { border-left-color: #5c8a4d; background: rgba(92,138,77,0.08); }
.calc-verdict strong { color: var(--gold-bright); font-style: normal; font-weight: 500; }
.calc-verdict.warn strong { color: #c47a72; }
.calc-verdict.ok strong { color: #5c8a4d; }

@media (max-width: 600px) {
  .calc-inputs { grid-template-columns: 1fr; }
  .calc-result-bar { grid-template-columns: 1fr 1fr 1fr; gap: 8px; padding: 14px 12px; }
  .calc-result-value { font-size: 24px; }
  .calc { padding: 22px 20px; }
  .calc-title { font-size: 22px; }
}