:root {
  --csd-ground: #eef1f4;
  --csd-panel: #fbfcfd;
  --csd-frost: #dfe7ec;
  --csd-ink: #14202a;
  --csd-muted: #62717d;
  --csd-line: #c5d0d8;
  --csd-blue: #215f9a;
  --csd-violet: #7b5bb4;
  --csd-amber: #c5912f;
  --csd-green: #4f8c72;
  --csd-red: #c65345;
  --csd-shadow: rgba(20, 32, 42, 0.12);
  --csd-display: "Hoefler Text", Georgia, "Times New Roman", serif;
  --csd-body: "Trebuchet MS", Verdana, Geneva, sans-serif;
  --csd-mono: "Lucida Console", Monaco, Consolas, monospace;
}

* { box-sizing: border-box; }

.csd-site,
.csd-article {
  background: radial-gradient(circle at 20% 0%, #f9fbfc 0, var(--csd-ground) 34rem, #e8edf1 100%);
  color: var(--csd-ink);
  font-family: var(--csd-body);
  line-height: 1.6;
}

.csd-site a,
.csd-article a { color: inherit; }

.instrument-hero {
  position: relative;
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr) minmax(15rem, 22rem);
  gap: clamp(1.25rem, 3vw, 3rem);
  align-items: stretch;
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(2rem, 6vw, 6rem) clamp(1rem, 4vw, 2rem) clamp(2rem, 5vw, 4rem);
}

.hero-rail {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  min-height: 24rem;
  border: 1px solid var(--csd-line);
  background: var(--csd-panel);
  box-shadow: 0 18px 40px var(--csd-shadow);
}

.hero-rail span:nth-child(1) { background: linear-gradient(to bottom, transparent 0 16%, var(--csd-blue) 16% 36%, transparent 36% 100%); }
.hero-rail span:nth-child(2) { background: linear-gradient(to bottom, transparent 0 28%, var(--csd-violet) 28% 58%, transparent 58% 100%); }
.hero-rail span:nth-child(3) { background: linear-gradient(to bottom, transparent 0 12%, var(--csd-amber) 12% 24%, transparent 24% 54%, var(--csd-amber) 54% 70%, transparent 70%); }
.hero-rail span:nth-child(4) { background: linear-gradient(to bottom, transparent 0 42%, var(--csd-green) 42% 76%, transparent 76%); }
.hero-rail span:nth-child(5) { background: linear-gradient(to bottom, transparent 0 20%, var(--csd-red) 20% 30%, transparent 30% 66%, var(--csd-red) 66% 82%, transparent 82%); }

.hero-copy {
  padding-top: clamp(0.5rem, 2vw, 2rem);
}

.kicker,
.section-label,
.calibration-label,
.rail-title,
.site-mark {
  margin: 0 0 0.8rem;
  color: var(--csd-blue);
  font-family: var(--csd-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.instrument-hero h1 {
  max-width: 12ch;
  margin: 0;
  font-family: var(--csd-display);
  font-size: clamp(3.2rem, 8vw, 7.4rem);
  font-weight: 500;
  line-height: 0.88;
  letter-spacing: -0.055em;
}

.hero-dek {
  max-width: 48rem;
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  color: #273846;
}

.byline {
  max-width: 40rem;
  margin: 1.4rem 0 0;
  color: var(--csd-muted);
}

.calibration-card {
  align-self: end;
  padding: 1.25rem;
  border: 1px solid var(--csd-line);
  background: rgba(251, 252, 253, 0.78);
  box-shadow: inset 0 0 0 0.45rem rgba(223, 231, 236, 0.55), 0 16px 36px var(--csd-shadow);
}

.calibration-card p:last-child { margin: 0; }

.variable-prisms,
.feature-lightbox,
.benchmark-caution,
.slide-archive {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 4rem) clamp(1rem, 4vw, 2rem);
}

.variable-prisms {
  display: grid;
  grid-template-columns: minmax(16rem, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  border-top: 1px solid var(--csd-line);
}

.section-intro h2,
.feature-copy h2,
.benchmark-caution h2,
.archive-head h2 {
  margin: 0;
  font-family: var(--csd-display);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1;
}

.section-intro h2 { font-size: clamp(2rem, 4vw, 4.1rem); }
.feature-copy h2,
.benchmark-caution h2 { font-size: clamp(2.2rem, 5vw, 5rem); }
.archive-head h2 { font-size: clamp(2rem, 4vw, 3.6rem); }

.chip-field {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-content: start;
}

.chip-field a,
.chip-field span {
  display: inline-block;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--csd-line);
  background: var(--csd-panel);
  color: #2b3d4b;
  text-decoration: none;
  box-shadow: 0 7px 18px rgba(20, 32, 42, 0.06);
}

.feature-lightbox {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 24rem);
  gap: clamp(1.5rem, 4vw, 4rem);
  margin-top: 1rem;
  border: 1px solid var(--csd-line);
  background: linear-gradient(135deg, rgba(251,252,253,0.96), rgba(232,237,241,0.88));
  overflow: hidden;
}

.lightbox-grid {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  pointer-events: none;
  opacity: 0.45;
}

.lightbox-grid span { border-right: 1px solid var(--csd-line); }

.feature-copy,
.method-stack { position: relative; }

.feature-copy p:not(.section-label) {
  max-width: 44rem;
  font-size: 1.05rem;
}

.feature-link {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.7rem 0.9rem;
  background: var(--csd-ink);
  color: #fff !important;
  text-decoration: none;
}

.method-stack {
  display: grid;
  gap: 0.7rem;
  align-content: center;
}

.method-stack p {
  margin: 0;
  padding: 0.8rem;
  border-left: 0.35rem solid var(--csd-blue);
  background: rgba(255,255,255,0.68);
}

.method-stack span {
  display: inline-block;
  min-width: 2rem;
  margin-right: 0.5rem;
  font-family: var(--csd-mono);
  color: var(--csd-violet);
}

.benchmark-caution {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 28rem);
  gap: clamp(1rem, 4vw, 4rem);
  align-items: end;
}

.benchmark-caution p:last-child {
  margin: 0;
  padding: 1rem 0 1rem 1rem;
  border-left: 1px solid var(--csd-red);
  color: var(--csd-muted);
}

.archive-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--csd-line);
  padding-bottom: 1rem;
}

.slides-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.study-slide {
  min-height: 22rem;
  background: var(--csd-panel);
  border: 1px solid var(--csd-line);
  box-shadow: 0 14px 30px rgba(20, 32, 42, 0.07);
}

.slide-link {
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  min-height: 22rem;
  padding: 1rem;
  text-decoration: none;
}

.spectrum-strip {
  display: grid;
  grid-template-columns: 1.2fr 0.7fr 1fr 0.45fr;
  height: 0.75rem;
  margin: -1rem -1rem 1rem;
}

.spectrum-strip span:nth-child(1) { background: var(--csd-blue); }
.spectrum-strip span:nth-child(2) { background: var(--csd-violet); }
.spectrum-strip span:nth-child(3) { background: var(--csd-amber); }
.spectrum-strip span:nth-child(4) { background: var(--csd-red); }

.slide-meta,
.slide-footer {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  color: var(--csd-muted);
  font-family: var(--csd-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.study-slide h3 {
  margin: 1.2rem 0 0.75rem;
  font-family: var(--csd-display);
  font-size: clamp(1.55rem, 2.4vw, 2.35rem);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.02;
}

.study-slide p {
  margin: 0;
  color: #334655;
}

.slide-footer {
  align-self: end;
  padding-top: 1rem;
  border-top: 1px solid var(--csd-line);
}

.article-instrument {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(1rem, 4vw, 2rem) clamp(1rem, 4vw, 2rem) clamp(1.5rem, 4vw, 3rem);
}

.article-topline {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--csd-line);
}

.back-link a {
  color: var(--csd-muted);
  text-decoration: none;
}

.article-spectrum {
  display: grid;
  grid-template-columns: 1.1fr 0.35fr 0.8fr 1.4fr 0.25fr 0.55fr;
  height: 1rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--csd-line);
  background: var(--csd-panel);
}

.article-spectrum span:nth-child(1) { background: rgba(33, 95, 154, 0.85); }
.article-spectrum span:nth-child(2) { background: rgba(197, 145, 47, 0.9); }
.article-spectrum span:nth-child(3) { background: rgba(123, 91, 180, 0.82); }
.article-spectrum span:nth-child(4) { background: rgba(79, 140, 114, 0.82); }
.article-spectrum span:nth-child(5) { background: rgba(198, 83, 69, 0.88); }
.article-spectrum span:nth-child(6) { background: rgba(20, 32, 42, 0.8); }

.article-instrument h1 {
  max-width: 14ch;
  margin: 0;
  font-family: var(--csd-display);
  font-size: clamp(3rem, 7vw, 6.8rem);
  font-weight: 500;
  letter-spacing: -0.055em;
  line-height: 0.92;
}

.article-meta {
  max-width: 42rem;
  margin-top: 1rem;
  color: var(--csd-muted);
  font-family: var(--csd-mono);
  font-size: 0.78rem;
}

.paper-lightbox {
  display: grid;
  grid-template-columns: minmax(10rem, 15rem) minmax(0, 44rem) minmax(13rem, 18rem);
  gap: clamp(1rem, 3vw, 2rem);
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2rem) clamp(3rem, 7vw, 6rem);
  align-items: start;
}

.methods-margin,
.action-rail {
  position: sticky;
  top: 1rem;
  padding: 1rem;
  border: 1px solid var(--csd-line);
  background: rgba(251,252,253,0.82);
}

.methods-margin ol {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--csd-muted);
}

.methods-margin li + li { margin-top: 0.55rem; }

.action-rail p:last-child {
  margin: 0;
  color: var(--csd-muted);
}

.article-body {
  padding: clamp(1.25rem, 4vw, 2.5rem);
  background: var(--csd-panel);
  border: 1px solid var(--csd-line);
  box-shadow: 0 22px 45px rgba(20, 32, 42, 0.09);
}

.article-body > *:first-child { margin-top: 0; }
.article-body > *:last-child { margin-bottom: 0; }

.article-body h2,
.article-body h3 {
  font-family: var(--csd-display);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.05;
}

.article-body h2 { margin-top: 2.2rem; font-size: clamp(1.8rem, 3vw, 2.7rem); }
.article-body h3 { margin-top: 1.7rem; font-size: 1.45rem; }

.article-body p,
.article-body li { color: #263947; }

.article-body blockquote {
  margin: 2rem 0;
  padding: 1rem 1.25rem;
  border-left: 0.45rem solid var(--csd-amber);
  background: #f3f6f8;
  color: #1d2b35;
}

.article-body code {
  font-family: var(--csd-mono);
  font-size: 0.9em;
  background: #edf2f5;
  padding: 0.1rem 0.25rem;
}

@media (max-width: 920px) {
  .instrument-hero,
  .variable-prisms,
  .feature-lightbox,
  .benchmark-caution,
  .paper-lightbox {
    grid-template-columns: 1fr;
  }

  .hero-rail {
    min-height: 4rem;
    grid-template-columns: none;
    grid-template-rows: repeat(5, 1fr);
  }

  .hero-rail span:nth-child(n) { background-size: 100% 100%; }

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

  .methods-margin,
  .action-rail { position: static; }

  .article-instrument h1,
  .instrument-hero h1 { max-width: none; }
}

@media (min-width: 921px) and (max-width: 1120px) {
  .slides-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}