/* ============================================================================
   Industrial Spine Research — Editorial design system
   Parchment + ink + burgundy + navy. Spectral serif throughout.
   ============================================================================ */

@import url("https://fonts.googleapis.com/css2?family=Spectral:wght@300;400;500;600;700&family=Inter:wght@400;500;600&display=swap");

:root {
  --bg:        #f5f1ea;
  --bg-2:      #ece6da;
  --bg-3:      #e3dccd;
  --ink:       #14171f;
  --ink-2:     #3a3e4a;
  --ink-3:     #767b89;
  --ink-4:     #a8aeb9;
  --navy:      #13294b;
  --navy-dk:   #0a1830;
  --burgundy:  #8b1538;
  --burgundy-dk:#6b0f2a;
  --gold:      #c9a05a;
  --gold-lt:   #e0c08d;
  --rule:      #c9bfaa;
  --rule-lt:   #d8d2c4;
  --success:   #2f7d32;
  --success-bg:#e8f4ea;
  --maxw:      1280px;
  --maxw-rd:   780px;
  --serif:     "Spectral", "Georgia", "Times New Roman", serif;
  --sans:      "Inter", -apple-system, "Helvetica Neue", Arial, sans-serif;
  --radius:    2px;
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  font-family: var(--serif); color: var(--ink); background: var(--bg);
  line-height: 1.6; -webkit-font-smoothing: antialiased;
}
a { color: var(--burgundy); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
img { max-width: 100%; height: auto; }
button { font-family: inherit; cursor: pointer; }

h1, h2, h3, h4 { font-family: var(--serif); font-weight: 500; letter-spacing: -0.01em; }
h1 { font-size: 2.6rem; line-height: 1.15; margin: 0 0 1.2rem; }
h2 { font-size: 2rem; line-height: 1.2; margin: 0 0 1rem; }
h3 { font-size: 1.4rem; line-height: 1.3; margin: 0 0 0.6rem; color: var(--ink); }
h4 { font-size: 1rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); }
p { margin: 0 0 1rem; }

/* Top burgundy strip */
.isr-strip {
  background: var(--burgundy); color: var(--bg);
  padding: 0.55rem 2rem; text-align: center;
  font-family: var(--sans); font-size: 0.86rem;
}
.isr-strip strong { font-weight: 600; }
.isr-strip a { color: var(--bg); text-decoration: underline; text-underline-offset: 2px; }
.isr-strip a:hover { color: var(--gold-lt); }

/* Header */
.isr-header {
  background: var(--ink); color: var(--bg);
  padding: 1.2rem 2.5rem;
  display: flex; align-items: center; justify-content: space-between;
  position: sticky; top: 0; z-index: 10;
}
.isr-wordmark {
  font-family: var(--serif); font-weight: 500; font-size: 1.4rem;
  color: var(--bg); display: flex; align-items: center; gap: 0.6rem;
}
.isr-wordmark .dot { color: var(--gold); font-style: italic; font-weight: 400; }
.isr-wordmark a, .isr-wordmark a:hover { color: var(--bg); text-decoration: none; }
.isr-nav { display: flex; gap: 1.7rem; align-items: center; font-family: var(--sans); font-size: 0.86rem; }
.isr-nav a { color: rgba(245,241,234,0.85); font-weight: 500; }
.isr-nav a:hover { color: var(--bg); text-decoration: none; }
.isr-nav-cta {
  padding: 0.5rem 1.1rem; border: 1px solid rgba(245,241,234,0.4);
  color: var(--bg) !important;
}
.isr-nav-cta:hover { border-color: var(--bg); background: rgba(255,255,255,0.08); }
.isr-nav-cta-primary { background: var(--burgundy); border-color: var(--burgundy); color: var(--bg) !important; }
.isr-nav-cta-primary:hover { background: var(--burgundy-dk); border-color: var(--burgundy-dk); }

/* Hero */
.isr-hero { padding: 4.5rem 2.5rem 4rem; max-width: var(--maxw); margin: 0 auto; }
.isr-hero-split { display: grid; grid-template-columns: 7fr 5fr; gap: 4rem; align-items: start; }
.isr-eyebrow {
  font-family: var(--sans); font-size: 0.78rem;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--burgundy); font-weight: 600;
  display: inline-block; padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--burgundy);
  margin-bottom: 1.6rem;
}
.isr-hero-headline {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(2.2rem, 4.6vw, 4rem);
  line-height: 1.05; color: var(--ink);
  margin: 0 0 1.4rem; letter-spacing: -0.018em;
}
.isr-hero-headline em { font-style: italic; color: var(--navy); }
.isr-hero-deck {
  font-family: var(--serif); font-size: 1.22rem;
  line-height: 1.6; color: var(--ink-2);
  margin: 0 0 1.8rem; max-width: 580px;
}
.isr-hero-byline {
  font-family: var(--sans); font-size: 0.86rem;
  color: var(--ink-3); display: flex; flex-wrap: wrap; gap: 1.2rem;
  border-top: 1px solid var(--rule-lt); padding-top: 1.1rem;
}
.isr-hero-byline strong { color: var(--ink); font-weight: 600; }

.isr-hero-interior { padding: 3.2rem 2.5rem 2.5rem; max-width: var(--maxw); margin: 0 auto; }
.isr-hero-interior h1 { font-size: clamp(2rem, 3.8vw, 3rem); line-height: 1.1; font-weight: 400; }
.isr-hero-interior h1 em { font-style: italic; color: var(--navy); }
.isr-hero-interior .isr-hero-deck { font-size: 1.16rem; max-width: 740px; }

/* Product card (hero side) */
.isr-product-card {
  background: var(--bg-2); border: 1px solid var(--rule);
  padding: 2rem 1.8rem; position: relative;
}
.isr-product-card-corner {
  position: absolute; top: -1px; right: -1px;
  background: var(--burgundy); color: var(--bg);
  padding: 0.4rem 0.9rem; font-family: var(--sans);
  font-size: 0.74rem; letter-spacing: 0.14em; text-transform: uppercase;
}
.isr-product-meta {
  font-family: var(--sans); font-size: 0.8rem;
  color: var(--ink-3); margin-bottom: 1rem;
}
.isr-product-meta strong { color: var(--ink); font-weight: 600; }
.isr-product-title {
  font-family: var(--serif); font-weight: 500;
  font-size: 1.32rem; line-height: 1.3; color: var(--ink);
  margin: 0 0 1.3rem;
}
.isr-product-stats {
  display: grid; gap: 0.45rem; padding: 1rem 0; margin: 0 0 1.4rem;
  border-top: 1px solid var(--rule-lt); border-bottom: 1px solid var(--rule-lt);
}
.isr-product-stats .row { display: flex; justify-content: space-between; font-family: var(--sans); font-size: 0.88rem; }
.isr-product-stats .label { color: var(--ink-2); }
.isr-product-stats .val { color: var(--ink); font-weight: 600; font-variant-numeric: tabular-nums; }
.isr-product-price-block { border-top: 2px solid var(--ink); padding: 1.2rem 0 0; }
.isr-product-price {
  font-family: var(--serif); font-size: 2.4rem; font-weight: 500;
  color: var(--ink); display: block; line-height: 1; margin-bottom: 0.3rem;
}
.isr-product-price-meta {
  font-family: var(--sans); font-size: 0.8rem;
  color: var(--ink-3); margin-bottom: 1.2rem;
}
.isr-status {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--sans); font-size: 0.82rem;
  color: var(--ink-2); margin-bottom: 1.3rem;
}
.isr-status::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--success); }
.isr-status-sold::before { background: var(--ink-4); }
.isr-status-reserved::before { background: var(--gold); }
.isr-status-firstlook::before { background: var(--burgundy); }

/* Buttons */
.isr-btn {
  display: inline-block; padding: 0.85rem 1.6rem;
  font-family: var(--sans); font-weight: 600; font-size: 0.92rem;
  letter-spacing: 0.04em; text-decoration: none; text-align: center;
  cursor: pointer; transition: all 0.15s ease; border: 1px solid var(--ink);
}
.isr-btn-primary { background: var(--ink); color: var(--bg); }
.isr-btn-primary:hover { background: var(--burgundy); border-color: var(--burgundy); color: var(--bg); text-decoration: none; }
.isr-btn-secondary { background: transparent; color: var(--ink); }
.isr-btn-secondary:hover { background: var(--ink); color: var(--bg); text-decoration: none; }
.isr-btn-burgundy { background: var(--burgundy); color: var(--bg); border-color: var(--burgundy); }
.isr-btn-burgundy:hover { background: var(--burgundy-dk); border-color: var(--burgundy-dk); color: var(--bg); text-decoration: none; }
.isr-btn-block { display: block; width: 100%; }
.isr-btn-large { padding: 1rem 1.8rem; font-size: 0.96rem; }
.isr-btn-row { display: flex; flex-wrap: wrap; gap: 0.7rem; }

/* Sections */
.isr-section { padding: 5rem 2.5rem; max-width: var(--maxw); margin: 0 auto; }
.isr-section-alt {
  background: var(--bg-2); border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule); padding: 5rem 2.5rem;
}
.isr-section-alt-inner, .isr-section-dark-inner { max-width: var(--maxw); margin: 0 auto; }
.isr-section-dark { background: var(--ink); color: var(--bg); padding: 5rem 2.5rem; }
.isr-section-dark h2, .isr-section-dark h3 { color: var(--bg); }
.isr-section-dark .isr-eyebrow { color: var(--gold); border-bottom-color: var(--gold); }
.isr-section-dark p { color: rgba(245,241,234,0.82); }

.isr-section-head {
  display: flex; justify-content: space-between; align-items: baseline;
  border-bottom: 2px solid var(--ink); padding-bottom: 1rem; margin-bottom: 2.5rem;
}
.isr-section-head h2 { margin: 0; font-size: 2.1rem; }
.isr-section-head-link {
  font-family: var(--sans); font-size: 0.82rem;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--burgundy); font-weight: 600;
}
.isr-section-lede {
  font-family: var(--serif); font-size: 1.16rem; line-height: 1.65;
  color: var(--ink-2); max-width: 740px; margin: 0 0 2.5rem;
}

/* Editorial essay */
.isr-essay-wrap { display: grid; grid-template-columns: 1fr 3fr; gap: 4rem; max-width: var(--maxw); margin: 0 auto; }
.isr-essay-rail {
  font-family: var(--sans); font-size: 0.74rem;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--burgundy); font-weight: 600;
}
.isr-essay-body { max-width: var(--maxw-rd); }
.isr-essay-body h2 { font-size: 2.1rem; line-height: 1.2; }
.isr-essay-body p {
  font-family: var(--serif); font-size: 1.12rem; line-height: 1.7;
  color: var(--ink-2); margin: 0 0 1.1rem;
}
.isr-dropcap::first-letter {
  font-family: var(--serif); font-weight: 600; font-size: 4.2rem;
  line-height: 0.9; float: left; padding: 0.35rem 0.45rem 0 0;
  color: var(--burgundy);
}
.isr-pullquote {
  font-family: var(--serif); font-style: italic; font-size: 1.32rem;
  line-height: 1.45; color: var(--ink); margin: 1.6rem 0;
  padding-left: 1.4rem; border-left: 3px solid var(--burgundy);
}

/* Publications grid */
.isr-pubs-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border-top: 1px solid var(--rule); }
.isr-pub {
  padding: 1.6rem 1.5rem 1.6rem 0;
  border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
  display: flex; flex-direction: column;
}
.isr-pub:nth-child(3n) { border-right: none; padding-right: 0; }
.isr-pub:not(:nth-child(3n)) { padding-right: 1.5rem; }
.isr-pub-cat {
  font-family: var(--sans); font-size: 0.72rem;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--burgundy); font-weight: 600; margin-bottom: 0.6rem;
}
.isr-pub-title {
  font-family: var(--serif); font-weight: 500; font-size: 1.22rem;
  line-height: 1.3; color: var(--ink); margin: 0 0 0.6rem;
}
.isr-pub-deck {
  font-family: var(--serif); font-size: 0.96rem; color: var(--ink-2);
  line-height: 1.55; margin: 0 0 1rem; flex: 1;
}
.isr-pub-meta {
  font-family: var(--sans); font-size: 0.76rem;
  color: var(--ink-3); letter-spacing: 0.04em; margin-top: auto;
}

/* Tier cards (dark band) */
.isr-tier-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.8rem; }
.isr-tier {
  padding: 2.2rem 1.9rem; background: rgba(255,255,255,0.04);
  border: 1px solid rgba(201,160,90,0.25);
  display: flex; flex-direction: column;
}
.isr-tier-featured { border-color: var(--gold); background: rgba(201,160,90,0.08); }
.isr-tier-featured-badge {
  position: absolute; top: -10px; left: 1.5rem;
  background: var(--gold); color: var(--ink); padding: 0.25rem 0.7rem;
  font-family: var(--sans); font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase; font-weight: 700;
}
.isr-tier-name { font-family: var(--serif); font-weight: 500; font-size: 1.5rem; color: var(--bg); margin: 0 0 0.4rem; }
.isr-tier-price { font-family: var(--serif); font-size: 2.1rem; color: var(--gold); font-weight: 400; margin: 0 0 0.3rem; }
.isr-tier-detail { font-family: var(--sans); font-size: 0.82rem; color: rgba(245,241,234,0.6); margin: 0 0 1.4rem; }
.isr-tier ul { list-style: none; padding: 0; margin: 0 0 1.8rem; flex: 1; }
.isr-tier li {
  font-family: var(--serif); font-size: 0.96rem;
  color: rgba(245,241,234,0.85); padding: 0.45rem 0;
  border-bottom: 1px solid rgba(201,160,90,0.15);
}
.isr-tier li:last-child { border-bottom: none; }
.isr-tier-cta {
  padding: 0.78rem 1.2rem; border: 1px solid rgba(201,160,90,0.6);
  font-family: var(--sans); font-size: 0.86rem;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--gold); font-weight: 600;
  text-align: center; text-decoration: none; margin-top: auto;
}
.isr-tier-cta:hover { background: var(--gold); color: var(--ink); border-color: var(--gold); text-decoration: none; }
.isr-tier-featured .isr-tier-cta { background: var(--gold); color: var(--ink); border-color: var(--gold); }
.isr-tier-featured .isr-tier-cta:hover { background: var(--gold-lt); border-color: var(--gold-lt); }

/* Funnel CTA band */
.isr-funnel-band {
  background: var(--bg-3); padding: 4rem 2.5rem;
  border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
}
.isr-funnel-band-inner {
  max-width: var(--maxw); margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1.3fr; gap: 3rem; align-items: center;
}
.isr-funnel-band h2 { font-size: 1.9rem; margin: 0 0 0.8rem; }
.isr-funnel-band h2 em { font-style: italic; color: var(--burgundy); }
.isr-funnel-band > .isr-funnel-band-inner > div > p {
  font-size: 1.02rem; color: var(--ink-2); margin: 0;
}
.isr-funnel-trio { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.isr-funnel-card {
  background: var(--bg); border: 1px solid var(--rule-lt);
  padding: 1.4rem 1.2rem;
}
.isr-funnel-card-eyebrow {
  font-family: var(--sans); font-size: 0.7rem;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--burgundy); font-weight: 600; margin-bottom: 0.4rem;
}
.isr-funnel-card-title {
  font-family: var(--serif); font-size: 1.08rem;
  color: var(--ink); margin: 0 0 0.3rem; font-weight: 500;
}
.isr-funnel-card-price {
  font-family: var(--serif); font-size: 1.2rem;
  color: var(--ink); font-weight: 500; margin: 0 0 0.5rem;
}
.isr-funnel-card-desc {
  font-family: var(--sans); font-size: 0.78rem;
  color: var(--ink-2); line-height: 1.5; margin: 0 0 0.9rem;
}
.isr-funnel-card a {
  font-family: var(--sans); font-size: 0.76rem;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--burgundy); font-weight: 600;
}
.isr-funnel-card a::after { content: " →"; }

/* Catalog cards */
.isr-catalog-list { display: grid; gap: 1.4rem; }
.isr-catalog-card {
  background: var(--bg-2); border: 1px solid var(--rule);
  padding: 1.8rem 2rem;
  display: grid; grid-template-columns: 1fr auto; gap: 1.4rem; align-items: start;
}
.isr-catalog-card-meta {
  font-family: var(--sans); font-size: 0.78rem;
  color: var(--ink-3); margin-bottom: 0.6rem;
}
.isr-catalog-card-meta strong { color: var(--ink); font-weight: 600; }
.isr-catalog-card h3 { margin: 0 0 0.5rem; font-size: 1.3rem; }
.isr-catalog-card p { font-family: var(--serif); font-size: 0.98rem; color: var(--ink-2); margin: 0; line-height: 1.55; }
.isr-catalog-card-side { display: flex; flex-direction: column; align-items: flex-end; gap: 0.6rem; min-width: 200px; }
.isr-catalog-card-price { font-family: var(--serif); font-size: 1.7rem; font-weight: 500; color: var(--ink); margin: 0; }
.isr-catalog-card-price-sold { color: var(--ink-4); text-decoration: line-through; }

/* Tables */
.isr-table { width: 100%; border-collapse: collapse; font-family: var(--sans); font-size: 0.94rem; margin: 1.4rem 0; }
.isr-table th, .isr-table td { text-align: left; padding: 0.75rem 0.85rem; border-bottom: 1px solid var(--rule-lt); }
.isr-table th { font-weight: 600; font-size: 0.76rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); background: var(--bg-3); }
.isr-table tbody th { font-weight: 600; color: var(--ink-2); background: transparent; text-transform: none; font-size: 0.94rem; letter-spacing: 0; }
.isr-table td { color: var(--ink-2); }
.isr-table-detail th { width: 32%; vertical-align: top; }

/* FAQ */
.isr-faq { border-bottom: 1px solid var(--rule); padding: 1.2rem 0; cursor: pointer; }
.isr-faq summary {
  font-family: var(--serif); font-weight: 500; font-size: 1.1rem;
  color: var(--ink); padding-right: 2.2rem; position: relative; list-style: none;
}
.isr-faq summary::-webkit-details-marker { display: none; }
.isr-faq summary::after {
  content: "+"; position: absolute; right: 0; top: -0.1rem;
  font-size: 1.5rem; color: var(--burgundy); font-weight: 300;
}
.isr-faq[open] summary::after { content: "−"; }
.isr-faq p { font-family: var(--serif); font-size: 0.98rem; color: var(--ink-2); line-height: 1.65; margin-top: 0.7rem; max-width: var(--maxw-rd); }

/* Forms */
.isr-form { display: flex; flex-direction: column; gap: 0.85rem; max-width: 560px; }
.isr-form label { font-family: var(--sans); font-size: 0.86rem; font-weight: 500; color: var(--ink); display: flex; flex-direction: column; gap: 0.3rem; }
.isr-form input, .isr-form select, .isr-form textarea {
  padding: 0.72rem 0.9rem; border: 1px solid var(--rule); border-radius: var(--radius);
  background: var(--bg); font-family: var(--serif); font-size: 1rem; color: var(--ink);
}
.isr-form input:focus, .isr-form textarea:focus, .isr-form select:focus { border-color: var(--ink); outline: 2px solid var(--rule-lt); }
.isr-form-help { font-family: var(--sans); font-size: 0.82rem; color: var(--ink-3); margin: 0.3rem 0 0; }

.isr-success { padding: 1.4rem; background: var(--success-bg); border-left: 3px solid var(--success); max-width: 560px; margin: 1rem 0; }
.isr-success h3 { color: #1b5e20; margin: 0 0 0.5rem; }
.isr-success p { color: var(--ink); margin: 0 0 0.4rem; }

/* Legal */
.isr-legal { max-width: var(--maxw-rd); }
.isr-legal h2 { font-size: 1.4rem; margin-top: 2.4rem; padding-top: 1.4rem; border-top: 1px solid var(--rule-lt); }
.isr-legal h2:first-child { margin-top: 0; padding-top: 0; border-top: none; }
.isr-legal p, .isr-legal li { font-family: var(--serif); font-size: 1rem; color: var(--ink-2); line-height: 1.65; }
.isr-legal ul { padding-left: 1.4rem; margin: 0.8rem 0; }
.isr-legal strong { color: var(--ink); font-weight: 600; }

/* Library download list */
.isr-download-list { list-style: none; padding: 0; margin: 0; }
.isr-download-list li {
  padding: 0.78rem 1rem; background: var(--bg); border: 1px solid var(--rule-lt);
  margin-bottom: 0.4rem; font-family: var(--sans); font-size: 0.92rem;
  display: flex; justify-content: space-between; align-items: center;
}

/* Members list */
.isr-members-list { list-style: none; padding: 0; margin: 1rem 0 2rem; }
.isr-members-list li {
  padding: 0.78rem 1rem; background: var(--bg-2); border: 1px solid var(--rule-lt);
  margin-bottom: 0.5rem; font-family: var(--sans); font-size: 0.94rem;
  display: flex; justify-content: space-between; align-items: center;
}

/* Authority paper cards (dark) */
.isr-papers-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.isr-paper-card {
  border: 1px solid rgba(201,160,90,0.3); padding: 1.6rem 1.5rem;
  color: rgba(245,241,234,0.92); transition: all 0.15s ease;
  display: block; text-decoration: none;
}
.isr-paper-card:hover { border-color: var(--gold); background: rgba(201,160,90,0.06); text-decoration: none; }
.isr-paper-card.policy { border-color: var(--gold); }
.isr-paper-card-tag { font-family: var(--sans); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--gold); font-weight: 600; margin-bottom: 0.6rem; }
.isr-paper-card-title { font-family: var(--serif); font-size: 1.13rem; line-height: 1.35; color: var(--bg); font-weight: 500; margin-bottom: 0.5rem; }
.isr-paper-card-meta { font-family: var(--sans); font-size: 0.78rem; color: var(--gold); opacity: 0.85; }
.isr-paper-card-desc { font-family: var(--serif); font-size: 0.94rem; color: rgba(245,241,234,0.7); line-height: 1.55; margin-top: 0.5rem; }

.isr-loading { padding: 3rem 1rem; text-align: center; color: var(--ink-3); font-family: var(--serif); font-style: italic; }

/* Footer */
.isr-footer { background: var(--bg-2); padding: 4rem 2.5rem 2rem; border-top: 1px solid var(--rule); }
.isr-footer-wrap { max-width: var(--maxw); margin: 0 auto; }
.isr-footer-top { display: grid; grid-template-columns: 2.4fr 1fr 1fr 1fr; gap: 2.6rem; padding-bottom: 2.2rem; border-bottom: 1px solid var(--rule); margin-bottom: 1.4rem; }
.isr-footer-firm { font-family: var(--serif); font-weight: 500; font-size: 1.5rem; color: var(--ink); margin-bottom: 0.4rem; }
.isr-footer-tagline { font-family: var(--serif); font-size: 1rem; color: var(--ink-2); max-width: 340px; line-height: 1.6; margin-bottom: 1.2rem; }
.isr-footer-pubs { font-family: var(--sans); font-size: 0.78rem; color: var(--ink-3); }
.isr-footer-col h4 { font-family: var(--sans); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-3); font-weight: 600; margin: 0 0 1rem; }
.isr-footer-col ul { list-style: none; padding: 0; margin: 0; }
.isr-footer-col li { margin-bottom: 0.55rem; }
.isr-footer-col a { font-family: var(--sans); font-size: 0.9rem; color: var(--ink-2); }
.isr-footer-col a:hover { color: var(--burgundy); }
.isr-footer-fine { font-family: var(--sans); font-size: 0.78rem; color: var(--ink-3); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; }

/* Responsive */
@media (max-width: 960px) {
  .isr-header { padding: 0.9rem 1.3rem; flex-wrap: wrap; gap: 0.7rem; }
  .isr-nav { gap: 0.85rem; flex-wrap: wrap; font-size: 0.8rem; }
  .isr-hero, .isr-section, .isr-section-alt, .isr-section-dark,
  .isr-funnel-band, .isr-hero-interior { padding: 2.6rem 1.3rem; }
  .isr-hero-split, .isr-essay-wrap, .isr-funnel-band-inner { grid-template-columns: 1fr; gap: 2rem; }
  .isr-pubs-grid, .isr-tier-grid, .isr-funnel-trio,
  .isr-papers-grid, .isr-footer-top { grid-template-columns: 1fr; gap: 1.4rem; }
  .isr-pub { border-right: none; padding-right: 0 !important; }
  .isr-catalog-card { grid-template-columns: 1fr; }
  .isr-catalog-card-side { align-items: flex-start; min-width: 0; }
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
}