:root {
  color-scheme: dark;
  --bg: #151515;
  --bg-deep: #090909;
  --panel: #0d0d0d;
  --panel-soft: #1a1917;
  --ink: #f5f2eb;
  --ink-soft: rgba(245, 242, 235, 0.72);
  --ink-muted: rgba(245, 242, 235, 0.48);
  --line: rgba(245, 242, 235, 0.14);
  --line-strong: rgba(245, 242, 235, 0.28);
  --gold: #c9a227;
  --gold-soft: #e0c977;
  --gold-wash: rgba(201, 162, 39, 0.11);
  --paper: #e8e1d2;
  --paper-ink: #171611;
  --serif: Baskerville, "Iowan Old Style", "Times New Roman", "Songti SC", SimSun, serif;
  --sans: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --wrap: min(1180px, calc(100vw - 48px));
  --radius: 2px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 83% 8%, rgba(201, 162, 39, 0.08), transparent 28rem),
    linear-gradient(180deg, #121212 0, var(--bg) 38rem, #111 100%);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  font-weight: 350;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

a:focus-visible,
summary:focus-visible {
  outline: 1px solid var(--gold-soft);
  outline-offset: 5px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(15, 15, 15, 0.88);
  backdrop-filter: blur(18px);
}

.nav {
  width: var(--wrap);
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 14px;
  text-decoration: none;
}

.brand strong {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 400;
  letter-spacing: 0.18em;
}

.brand span,
.nav-meta,
.eyebrow,
.section-index,
.micro,
.card-kicker,
.source-tag {
  font-family: var(--mono);
  font-size: 10px;
  line-height: 1.4;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.brand span {
  color: var(--ink-muted);
}

.nav-meta {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--ink-muted);
}

.nav-meta a {
  color: var(--gold-soft);
  text-decoration: none;
}

.hero {
  width: var(--wrap);
  min-height: calc(100vh - 72px);
  margin: 0 auto;
  padding: clamp(76px, 11vh, 138px) 0 72px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(270px, 0.36fr);
  gap: clamp(48px, 9vw, 132px);
  align-items: end;
}

.hero-copy {
  max-width: 860px;
}

.eyebrow {
  margin: 0 0 22px;
  color: var(--gold-soft);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 30px;
  font-family: var(--serif);
  font-size: clamp(54px, 7.4vw, 106px);
  font-weight: 400;
  line-height: 0.96;
  letter-spacing: -0.045em;
}

.hero-lede {
  max-width: 780px;
  margin-bottom: 38px;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: clamp(20px, 2vw, 30px);
  line-height: 1.42;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  min-height: 48px;
  padding: 12px 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 1px solid var(--line-strong);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-decoration: none;
  text-transform: uppercase;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease;
}

.button.primary {
  border-color: var(--paper);
  background: var(--paper);
  color: var(--paper-ink);
}

.button:hover {
  border-color: var(--gold-soft);
  background: var(--gold-wash);
}

.button.primary:hover {
  border-color: var(--gold-soft);
  background: var(--gold-soft);
}

.hero-aside {
  border-top: 1px solid var(--gold);
  padding-top: 20px;
}

.hero-aside .micro {
  margin-bottom: 28px;
  color: var(--gold-soft);
}

.hero-aside dl {
  margin: 0;
}

.hero-aside div {
  padding: 15px 0;
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 16px;
  border-top: 1px solid var(--line);
}

.hero-aside dt {
  color: var(--ink-muted);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-aside dd {
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.55;
}

.statement {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg-deep);
}

.statement-inner {
  width: var(--wrap);
  margin: 0 auto;
  padding: clamp(72px, 10vw, 130px) 0;
  display: grid;
  grid-template-columns: 0.28fr 1fr;
  gap: clamp(34px, 8vw, 120px);
}

.section-index {
  color: var(--gold-soft);
}

.statement blockquote {
  margin: 0;
  max-width: 920px;
  font-family: var(--serif);
  font-size: clamp(32px, 4.5vw, 62px);
  line-height: 1.12;
  letter-spacing: -0.025em;
}

.statement blockquote em {
  color: var(--gold-soft);
  font-style: normal;
}

.section {
  width: var(--wrap);
  margin: 0 auto;
  padding: clamp(82px, 11vw, 154px) 0;
}

.section-head {
  margin-bottom: clamp(50px, 7vw, 92px);
  display: grid;
  grid-template-columns: 0.28fr 1fr;
  gap: clamp(34px, 8vw, 120px);
}

.section-title-wrap {
  max-width: 860px;
}

h2 {
  margin-bottom: 24px;
  font-family: var(--serif);
  font-size: clamp(42px, 5.3vw, 78px);
  font-weight: 400;
  line-height: 1.02;
  letter-spacing: -0.035em;
}

.section-intro {
  max-width: 760px;
  color: var(--ink-soft);
  font-size: clamp(17px, 1.6vw, 22px);
  line-height: 1.65;
}

.metabolism {
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border-top: 1px solid var(--line-strong);
  border-left: 1px solid var(--line-strong);
}

.metabolism::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: 43px;
  left: 8%;
  right: 8%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.metabolism article {
  position: relative;
  z-index: 1;
  min-height: 330px;
  padding: 24px;
  border-right: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(201, 162, 39, 0.035), transparent 45%);
}

.step-number {
  width: 38px;
  height: 38px;
  margin-bottom: 74px;
  display: grid;
  place-items: center;
  border: 1px solid var(--gold);
  border-radius: 50%;
  background: var(--bg);
  color: var(--gold-soft);
  font-family: var(--mono);
  font-size: 10px;
}

.metabolism h3,
.feature h3,
.choice-card h3,
.consumer h3 {
  margin-bottom: 12px;
  font-family: var(--serif);
  font-size: 25px;
  font-weight: 400;
  line-height: 1.15;
}

.metabolism p,
.feature p,
.choice-card p,
.consumer p {
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.7;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  border-top: 1px solid var(--line-strong);
  border-left: 1px solid var(--line-strong);
}

.feature {
  min-height: 300px;
  padding: clamp(24px, 3vw, 40px);
  border-right: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  background: rgba(5, 5, 5, 0.28);
}

.feature:nth-child(1),
.feature:nth-child(4) {
  grid-column: span 7;
}

.feature:nth-child(2),
.feature:nth-child(3) {
  grid-column: span 5;
}

.card-kicker {
  margin-bottom: 78px;
  color: var(--gold-soft);
}

.feature strong {
  display: block;
  margin-top: 20px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 500;
}

.comparison {
  padding: clamp(82px, 11vw, 154px) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  color: var(--paper-ink);
}

.comparison .section-head,
.comparison-inner {
  width: var(--wrap);
  margin-left: auto;
  margin-right: auto;
}

.comparison .section-index {
  color: #7b6112;
}

.comparison .section-intro {
  color: rgba(23, 22, 17, 0.7);
}

.choice-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid rgba(23, 22, 17, 0.3);
  border-left: 1px solid rgba(23, 22, 17, 0.3);
}

.choice-card {
  min-height: 330px;
  padding: clamp(26px, 4vw, 52px);
  border-right: 1px solid rgba(23, 22, 17, 0.3);
  border-bottom: 1px solid rgba(23, 22, 17, 0.3);
}

.choice-card .card-kicker {
  margin-bottom: 46px;
  color: #725a13;
}

.choice-card h3 {
  font-size: clamp(30px, 3vw, 44px);
}

.choice-card p {
  max-width: 490px;
  color: rgba(23, 22, 17, 0.72);
  font-size: 15px;
}

.choice-card strong {
  display: block;
  margin-bottom: 12px;
  color: var(--paper-ink);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.choice-card .source-link {
  display: inline-block;
  margin-top: 26px;
  color: #725a13;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  text-transform: uppercase;
}

.decision-bar {
  margin-top: 34px;
  padding: 28px 0 0;
  display: grid;
  grid-template-columns: 0.5fr 1fr;
  gap: 28px;
  border-top: 1px solid rgba(23, 22, 17, 0.3);
}

.decision-bar strong {
  font-family: var(--serif);
  font-size: 27px;
  font-weight: 400;
  line-height: 1.2;
}

.decision-bar p {
  margin: 0;
  color: rgba(23, 22, 17, 0.72);
}

.consumer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line-strong);
  border-left: 1px solid var(--line-strong);
}

.consumer {
  min-height: 250px;
  padding: 28px;
  border-right: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.consumer .micro {
  margin-bottom: 48px;
  color: var(--gold-soft);
}

.consumer h3 {
  font-size: 21px;
}

.buyer-panel {
  display: grid;
  grid-template-columns: 0.72fr 1fr;
  border: 1px solid var(--line-strong);
  background: var(--bg-deep);
}

.buyer-panel > div {
  padding: clamp(34px, 5vw, 72px);
}

.buyer-panel > div + div {
  border-left: 1px solid var(--line-strong);
}

.buyer-panel h2 {
  font-size: clamp(40px, 4.5vw, 64px);
}

.buyer-panel ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.buyer-panel li {
  position: relative;
  padding: 18px 0 18px 32px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
}

.buyer-panel li::before {
  content: "";
  position: absolute;
  top: 28px;
  left: 4px;
  width: 8px;
  height: 8px;
  border: 1px solid var(--gold);
  transform: rotate(45deg);
}

.faq-list {
  border-top: 1px solid var(--line-strong);
}

.faq-list details {
  border-bottom: 1px solid var(--line-strong);
}

.faq-list summary {
  position: relative;
  padding: 28px 58px 28px 0;
  cursor: pointer;
  font-family: var(--serif);
  font-size: clamp(22px, 2.3vw, 32px);
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "+";
  position: absolute;
  top: 25px;
  right: 4px;
  color: var(--gold-soft);
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 300;
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-answer {
  max-width: 820px;
  padding: 0 0 34px;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.78;
}

.source-note {
  margin-top: 70px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  color: var(--ink-muted);
  font-size: 12px;
}

.source-note a {
  color: var(--ink-soft);
  text-underline-offset: 3px;
}

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

.footer-inner {
  width: var(--wrap);
  margin: 0 auto;
  padding: 42px 0 54px;
  display: flex;
  justify-content: space-between;
  gap: 30px;
  color: var(--ink-muted);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .hero-aside {
    max-width: 660px;
  }

  .metabolism {
    grid-template-columns: repeat(2, 1fr);
  }

  .metabolism::before {
    display: none;
  }

  .metabolism article:last-child {
    grid-column: 1 / -1;
  }

  .step-number {
    margin-bottom: 44px;
  }

  .consumer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 760px) {
  :root {
    --wrap: min(100% - 28px, 1180px);
  }

  .nav {
    min-height: 62px;
  }

  .brand strong {
    font-size: 15px;
  }

  .brand span,
  .nav-meta > span {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-top: 72px;
  }

  h1 {
    font-size: clamp(48px, 15vw, 68px);
  }

  .statement-inner,
  .section-head {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .metabolism,
  .choice-grid,
  .consumer-grid,
  .buyer-panel {
    grid-template-columns: 1fr;
  }

  .metabolism article:last-child {
    grid-column: auto;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .feature:nth-child(n) {
    grid-column: auto;
  }

  .buyer-panel > div + div {
    border-top: 1px solid var(--line-strong);
    border-left: 0;
  }

  .decision-bar {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}

/* Website production shell + procurement guide. Scoped to the buyer-guide asset. */
.guide-page .nav { flex-direction: row; padding-left: 0; }
.brand { align-items: center; }
.brand img { width: 38px; height: 38px; object-fit: contain; }
.guide-brand-copy { display: grid; gap: 2px; }
.guide-brand-copy strong { font-family: var(--serif); font-size: 16px; font-weight: 400; letter-spacing: .16em; }
.guide-brand-copy small { color: var(--ink-muted); font-family: var(--mono); font-size: 8px; letter-spacing: .13em; }
.guide-language { display: inline-flex; align-items: center; gap: 8px; }
.guide-language i { color: var(--ink-muted); font-style: normal; }
.guide-language a[aria-current="page"] { color: var(--ink); }
.guide-closing { width: var(--wrap); margin: 0 auto; padding: 74px 0 88px; display: flex; align-items: center; justify-content: space-between; gap: 24px; border-top: 1px solid var(--line); }
.guide-closing > span { color: var(--ink-muted); font-family: var(--mono); font-size: 10px; letter-spacing: .15em; }
.guide-page #signal.footer-section { width: 100%; max-width: none; min-height: 0; padding: 70px max(24px, calc((100vw - 1200px) / 2)) 42px; }
.guide-page #signal .footer-brand-title { font-size: clamp(32px, 4vw, 54px); }

.guide-procurement { width: min(1080px, calc(100% - 40px)); margin: 0 auto; position: relative; }
.guide-procurement > header { min-height: 76vh; display: flex; flex-direction: column; justify-content: flex-end; padding: 100px 0 72px; border-bottom: 1px solid var(--line); }
.guide-procurement .eyebrow,
.guide-procurement .question,
.guide-procurement .chapter-number { color: var(--gold-soft); font: 12px/1.4 var(--mono); letter-spacing: .16em; text-transform: uppercase; }
.guide-procurement h1 { margin: 22px 0; max-width: 920px; font: clamp(44px, 8vw, 96px)/.98 var(--serif); letter-spacing: -.045em; }
.guide-procurement .lead { max-width: 760px; color: rgba(245,242,235,.78); font-size: clamp(20px,2.5vw,29px); line-height: 1.45; }
.guide-procurement .question { margin-top: 36px; max-width: 760px; color: var(--ink-muted); letter-spacing: .04em; text-transform: none; }
.guide-procurement .thesis { margin: 0; padding: 88px 0; max-width: 920px; color: #fff; font: clamp(30px,5vw,58px)/1.18 var(--serif); }
.guide-procurement .chapter { display: grid; grid-template-columns: 90px 1fr; gap: 30px; padding: 68px 0; border-top: 1px solid var(--line); }
.guide-procurement .chapter h2 { margin: 0 0 24px; font: clamp(28px,4vw,48px)/1.15 var(--serif); }
.guide-procurement .chapter p,
.guide-procurement .chapter ul { max-width: 760px; color: rgba(245,242,235,.76); }
.guide-procurement .chapter li { margin: 9px 0; }
.guide-procurement .decision { margin: 70px 0 100px; padding: 44px; border: 1px solid rgba(224,201,119,.35); background: rgba(201,162,39,.055); }
.guide-procurement .decision h2 { margin: 0 0 20px; font: 36px/1.15 var(--serif); }
.guide-procurement .choice { color: var(--gold-soft); font-size: 22px; }
.guide-procurement .guide-source-footer { border-top: 1px solid var(--line); padding: 50px 0 80px; color: var(--ink-muted); font-size: 14px; }
.guide-procurement .guide-source-footer a { color: var(--ink-soft); }

@media (max-width: 760px) {
  .nav { min-height: 66px; gap: 12px; }
  .brand img { width: 32px; height: 32px; }
  .guide-brand-copy small,
  .guide-back { display: none; }
  .guide-page .nav-meta > .guide-language { display: inline-flex; }
  .guide-closing { align-items: flex-start; flex-direction: column; }
  .guide-procurement { width: min(100% - 28px, 1080px); }
  .guide-procurement > header { min-height: 68vh; padding: 72px 0 54px; }
  .guide-procurement .chapter { grid-template-columns: 1fr; gap: 15px; }
  .guide-procurement .decision { padding: 28px; }
  .guide-page #signal.footer-section { padding: 60px 20px 40px; }
}