/* quant.observer - Tactical Telemetry design system */

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url("https://cdn.jsdelivr.net/fontsource/fonts/jetbrains-mono@latest/latin-400-normal.woff2")
    format("woff2");
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("https://cdn.jsdelivr.net/fontsource/fonts/jetbrains-mono@latest/latin-700-normal.woff2")
    format("woff2");
}

:root {
  --bg: #0a0a0a;
  --bg-elevated: #121212;
  --fg: #eaeaea;
  --fg-muted: #8a8a8a;
  --accent: #e61919;
  --accent-dim: rgba(230, 25, 25, 0.15);
  --border: #2a2a2a;
  --border-strong: #eaeaea;
  --live: #4af626;
  --font-macro: "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "Cascadia Code", monospace;
  --max-width: 1400px;
  --nav-height: 64px;
  --gutter: 1rem;
}

@media (min-width: 768px) {
  :root {
    --gutter: 2rem;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.4;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg);
  background: var(--bg);
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 100;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.12) 2px,
    rgba(0, 0, 0, 0.12) 4px
  );
  opacity: 0.35;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 99;
  pointer-events: none;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  color: var(--accent);
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  text-transform: inherit;
  letter-spacing: inherit;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ── Navigation ── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-height);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  height: 100%;
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.header-end {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-left: auto;
}

.logo {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  flex-shrink: 0;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}

.logo-mark {
  color: var(--accent);
}

.logo-domain {
  color: var(--fg);
}

.nav-primary {
  display: none;
  align-items: center;
  justify-content: flex-end;
  gap: 2rem;
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
}

.nav-primary a {
  transition: color 0.2s ease;
}

.nav-primary a[aria-current="page"] {
  color: var(--accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  padding: 4px;
}

.menu-toggle span {
  display: block;
  height: 1px;
  background: var(--fg);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.nav-mobile {
  display: none;
  position: fixed;
  inset: var(--nav-height) 0 0 0;
  z-index: 40;
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 2rem 1rem;
  flex-direction: column;
  gap: 1.5rem;
  font-size: 0.875rem;
  letter-spacing: 0.14em;
}

.nav-mobile.is-open {
  display: flex;
}

@media (min-width: 1024px) {
  .nav-primary {
    display: flex;
  }

  .menu-toggle {
    display: none;
  }
}

/* ── Hero ── */

.hero {
  border-bottom: 1px solid var(--border);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  min-height: calc(100dvh - var(--nav-height));
  max-height: none;
}

@media (min-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr 1fr;
    max-height: calc(100dvh - var(--nav-height));
  }
}

.hero .container {
  height: 100%;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 5rem 0 3rem;
  border-bottom: 1px solid var(--border);
}

@media (min-width: 768px) {
  .hero-copy {
    padding-top: 6rem;
  }
}

@media (min-width: 1024px) {
  .hero-copy {
    padding-top: 5rem;
    border-bottom: none;
    border-right: 1px solid var(--border);
  }
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
  margin-bottom: 2rem;
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  color: var(--fg-muted);
}

.hero-meta time {
  color: var(--fg);
}

.hero-title {
  font-family: var(--font-macro);
  font-size: clamp(2.25rem, 5.5vw, 3.75rem);
  font-weight: 900;
  line-height: 0.92;
  letter-spacing: -0.04em;
  text-transform: uppercase;
  color: var(--fg);
  margin-bottom: 1.25rem;
  max-width: 12ch;
}

.hero-title .accent {
  color: var(--accent);
}

.hero-sub {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 400;
  line-height: 1.55;
  letter-spacing: 0.04em;
  text-transform: none;
  color: var(--fg-muted);
  max-width: 42ch;
  margin-bottom: 2rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.5rem;
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  border: 1px solid var(--border-strong);
  transition: background 0.2s ease, color 0.2s ease, transform 0.15s ease;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}

.btn-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--fg);
}

.btn-secondary {
  background: transparent;
  color: var(--fg);
  border-color: var(--border);
}

.btn-secondary:hover {
  border-color: var(--fg);
  color: var(--fg);
}

.hero-visual {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 320px;
  background: var(--bg-elevated);
  overflow: hidden;
}

@media (min-width: 1024px) {
  .hero-visual {
    min-height: 0;
  }
}

.hero-scope {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  margin: 1px;
  border: 1px solid var(--border);
  background:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  background-color: var(--bg);
}

.scope-header,
.scope-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.875rem 1.25rem;
  font-size: 0.5625rem;
  letter-spacing: 0.16em;
  color: var(--fg-muted);
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}

.scope-footer {
  margin-top: auto;
  border-bottom: none;
  border-top: 1px solid var(--border);
}

.scope-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  flex: 1;
  background: var(--border);
}

@media (min-width: 640px) {
  .scope-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .scope-grid-duo .scope-block-wide {
    grid-column: span 2;
  }
}

.scope-block {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-height: 140px;
  padding: 1.25rem;
  background: var(--bg);
  border-left: 2px solid var(--border);
  transition: background 0.25s ease, border-color 0.25s ease;
}

.scope-grid .scope-block:first-of-type {
  border-left-color: var(--accent);
  background: var(--accent-dim);
}

.scope-grid:hover .scope-block {
  background: var(--bg);
  border-left-color: var(--border);
}

.scope-grid:hover .scope-block:hover {
  border-left-color: var(--accent);
  background: var(--accent-dim);
}

.scope-block-planned .scope-name {
  color: var(--fg-muted);
}

.scope-grid:hover .scope-block-planned:hover .scope-name {
  color: var(--fg);
}

.scope-label {
  font-size: 0.5625rem;
  letter-spacing: 0.16em;
  color: var(--fg-muted);
}

.scope-name {
  font-family: var(--font-macro);
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 0.95;
  text-transform: uppercase;
}

.scope-desc {
  font-size: 0.6875rem;
  letter-spacing: 0.03em;
  text-transform: none;
  line-height: 1.5;
  color: var(--fg-muted);
  max-width: 32ch;
}

.scope-status {
  margin-top: auto;
  align-self: flex-start;
  font-size: 0.5625rem;
  letter-spacing: 0.14em;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border);
  color: var(--fg-muted);
}

.scope-block:not(.scope-block-planned) .scope-status {
  border-color: var(--fg-muted);
  color: var(--fg);
}

@media (prefers-reduced-motion: reduce) {
  .scope-block {
    transition: none;
  }
}

.scope-crosshair {
  position: absolute;
  font-size: 0.875rem;
  line-height: 1;
  color: var(--border-strong);
  opacity: 0.35;
  pointer-events: none;
}

.scope-crosshair-tl {
  top: 3.25rem;
  left: 0.75rem;
}

.scope-crosshair-tr {
  top: 3.25rem;
  right: 0.75rem;
}

.scope-crosshair-bl {
  bottom: 2.75rem;
  left: 0.75rem;
}

.scope-crosshair-br {
  bottom: 2.75rem;
  right: 0.75rem;
}

/* ── Section shell ── */

.section {
  border-bottom: 1px solid var(--border);
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 3rem 0 2rem;
}

.section-head-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

@media (min-width: 768px) {
  .section-head {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }
}

.section-title {
  font-family: var(--font-macro);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.03em;
  text-transform: uppercase;
}

.section-link {
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  color: var(--fg-muted);
  transition: color 0.2s ease;
}

.section-link:hover {
  color: var(--accent);
}

.section-gloss,
.term-gloss {
  font-size: 0.6875rem;
  letter-spacing: 0.03em;
  text-transform: none;
  line-height: 1.55;
  color: var(--fg-muted);
  max-width: 48ch;
}

.term-gloss {
  padding-left: 0.75rem;
  border-left: 1px solid var(--accent);
}

/* ── Regime snapshot ── */

.regime-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-bottom: 3rem;
}

@media (min-width: 768px) {
  .regime-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .regime-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.regime-cell {
  background: var(--bg);
  padding: 1.25rem 1.5rem;
}

.regime-cell.featured {
  background: var(--accent-dim);
  border-left: 2px solid var(--accent);
}

@media (min-width: 768px) {
  .regime-cell.featured {
    grid-column: span 2;
  }
}

@media (min-width: 1024px) {
  .regime-cell.featured {
    grid-column: span 1;
  }
}

.regime-label {
  font-size: 0.5625rem;
  letter-spacing: 0.16em;
  color: var(--fg-muted);
  margin-bottom: 0.5rem;
}

.regime-value {
  font-family: var(--font-macro);
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.regime-note {
  font-size: 0.625rem;
  letter-spacing: 0.06em;
  text-transform: none;
  color: var(--fg-muted);
  line-height: 1.45;
}

/* ── Market cards ── */

.market-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-bottom: 3rem;
}

@media (min-width: 768px) {
  .market-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.market-card {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  min-height: 220px;
  transition: background 0.2s ease;
}

.market-card:hover {
  background: var(--bg-elevated);
}

.market-card.is-planned {
  opacity: 0.55;
}

.market-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.market-name {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
}

.market-tag {
  font-size: 0.5625rem;
  letter-spacing: 0.14em;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border);
  color: var(--fg-muted);
}

.market-tag.live {
  border-color: var(--live);
  color: var(--live);
}

.market-card-body {
  flex: 1;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.market-signal {
  font-family: var(--font-macro);
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  text-transform: uppercase;
}

.market-signal.up {
  color: var(--fg);
}

.market-signal.down {
  color: var(--accent);
}

.market-detail {
  font-size: 0.625rem;
  letter-spacing: 0.06em;
  text-transform: none;
  color: var(--fg-muted);
  line-height: 1.5;
}

.market-card-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border);
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  color: var(--fg-muted);
}

.market-card-footer a {
  color: var(--fg);
}

.market-card-footer a:hover {
  color: var(--accent);
}

/* ── Latest brief ── */

.brief-panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-bottom: 3rem;
}

@media (min-width: 1024px) {
  .brief-panel {
    grid-template-columns: 280px 1fr;
  }
}

.brief-sidebar {
  background: var(--bg-elevated);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.brief-date-block {
  border-left: 2px solid var(--accent);
  padding-left: 1rem;
}

.brief-date-label {
  font-size: 0.5625rem;
  letter-spacing: 0.16em;
  color: var(--fg-muted);
  margin-bottom: 0.35rem;
}

.brief-date {
  font-family: var(--font-macro);
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.brief-index {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.brief-index a {
  display: block;
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--fg-muted);
  transition: color 0.2s ease;
}

.brief-index a:hover {
  color: var(--accent);
}

.brief-content {
  background: var(--bg);
  padding: 1.5rem;
}

@media (min-width: 768px) {
  .brief-content {
    padding: 2rem;
  }
}

.brief-excerpt {
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: none;
  line-height: 1.65;
  color: var(--fg-muted);
  margin-bottom: 1.5rem;
  max-width: 65ch;
}

.brief-excerpt strong {
  color: var(--fg);
  font-weight: 700;
}

.brief-read {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--fg);
  border: 1px solid var(--border-strong);
  padding: 0.75rem 1.25rem;
  transition: background 0.2s ease, color 0.2s ease;
}

.brief-read:hover {
  background: var(--fg);
  color: var(--bg);
}

/* ── Research strip ── */

.research-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-bottom: 3rem;
}

@media (min-width: 768px) {
  .research-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

.research-item {
  background: var(--bg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: background 0.2s ease;
}

.research-item:hover {
  background: var(--bg-elevated);
}

.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.research-tag {
  font-size: 0.5625rem;
  letter-spacing: 0.14em;
  padding: 0.2rem 0.45rem;
  border: 1px solid var(--border);
  color: var(--fg-muted);
}

.research-title {
  font-family: var(--font-macro);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.15;
  text-transform: uppercase;
}

.research-meta {
  font-size: 0.5625rem;
  letter-spacing: 0.12em;
  color: var(--fg-muted);
  margin-top: auto;
}

/* ── Subscribe CTA ── */

.subscribe-band {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-bottom: 3rem;
}

@media (min-width: 768px) {
  .subscribe-band {
    grid-template-columns: 1fr 1fr;
  }
}

.subscribe-copy {
  background: var(--accent-dim);
  border-left: 2px solid var(--accent);
  padding: 2rem 1.5rem;
}

.subscribe-copy h2 {
  font-family: var(--font-macro);
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 0.95;
  margin-bottom: 0.75rem;
}

.subscribe-copy p {
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  text-transform: none;
  color: var(--fg-muted);
  line-height: 1.55;
  max-width: 38ch;
}

.subscribe-form-wrap,
.explore-band-actions {
  background: var(--bg);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1rem;
}

.explore-band-actions {
  flex-direction: row;
  flex-wrap: wrap;
  align-items: center;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

@media (min-width: 480px) {
  .form-row {
    flex-direction: row;
  }
}

.form-row label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.form-row input {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: lowercase;
  padding: 0.875rem 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--fg);
  outline: none;
  transition: border-color 0.2s ease;
}

.form-row input::placeholder {
  color: var(--fg-muted);
  opacity: 1;
}

.form-row input:focus {
  border-color: var(--fg);
}

.form-note {
  font-size: 0.5625rem;
  letter-spacing: 0.08em;
  text-transform: none;
  color: var(--fg-muted);
}

/* ── Footer ── */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
  }
}

.footer-brand {
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
}

.footer-brand p {
  margin-top: 0.75rem;
  font-size: 0.625rem;
  letter-spacing: 0.04em;
  text-transform: none;
  color: var(--fg-muted);
  line-height: 1.55;
  max-width: 40ch;
}

.footer-col h3 {
  font-size: 0.5625rem;
  letter-spacing: 0.16em;
  color: var(--fg-muted);
  margin-bottom: 1rem;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-col a {
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  color: var(--fg);
}

.footer-bottom {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  justify-content: space-between;
  font-size: 0.5625rem;
  letter-spacing: 0.12em;
  color: var(--fg-muted);
}

/* ── Reveal animation ── */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

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

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  body::before {
    display: none;
  }
}

/* ── Inner pages ── */

.page-main {
  padding-bottom: 4rem;
}

.page-header {
  padding: 3.5rem 0 2.5rem;
  border-bottom: 1px solid var(--border);
}

.page-meta {
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  color: var(--fg-muted);
  margin-bottom: 1rem;
}

.page-title {
  font-family: var(--font-macro);
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.04em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  max-width: 20ch;
}

.page-intro {
  font-size: 0.8125rem;
  letter-spacing: 0.03em;
  text-transform: none;
  line-height: 1.6;
  color: var(--fg-muted);
  max-width: 60ch;
}

.page-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}

.page-nav a {
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  padding: 0.4rem 0.65rem;
  border: 1px solid var(--border);
  color: var(--fg-muted);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-nav a:hover {
  color: var(--fg);
  border-color: var(--fg-muted);
}

.tool-category {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: calc(var(--nav-height) + 1rem);
}

.tool-category-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.tool-category-title {
  font-family: var(--font-macro);
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 0.95;
  text-transform: uppercase;
}

.tool-category-desc {
  font-size: 0.6875rem;
  letter-spacing: 0.03em;
  text-transform: none;
  color: var(--fg-muted);
  line-height: 1.5;
  max-width: 42ch;
}

.tool-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.tool-entry {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  padding: 1.25rem 1.5rem;
  background: var(--bg);
  transition: background 0.2s ease;
}

@media (min-width: 640px) {
  .tool-entry {
    grid-template-columns: 1fr auto;
    align-items: start;
    gap: 1.5rem;
  }
}

.tool-entry:hover {
  background: var(--bg-elevated);
}

.tool-entry-name {
  font-family: var(--font-macro);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}

.tool-entry-name a {
  color: var(--fg);
  transition: color 0.2s ease;
}

.tool-entry-name a:hover {
  color: var(--accent);
}

.tool-entry-desc {
  font-size: 0.6875rem;
  letter-spacing: 0.02em;
  text-transform: none;
  line-height: 1.55;
  color: var(--fg-muted);
  max-width: 55ch;
}

.tool-entry-tag {
  flex-shrink: 0;
  align-self: start;
  font-size: 0.5625rem;
  letter-spacing: 0.12em;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border);
  color: var(--fg-muted);
  white-space: nowrap;
}

.prose-section {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: calc(var(--nav-height) + 1rem);
}

.prose-section h2 {
  font-family: var(--font-macro);
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.prose-section p,
.prose-section li {
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  text-transform: none;
  line-height: 1.65;
  color: var(--fg-muted);
}

.prose-section p {
  margin-bottom: 1rem;
  max-width: 65ch;
}

.prose-section ul,
.prose-section ol {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
  max-width: 65ch;
}

.prose-section li {
  margin-bottom: 0.5rem;
}

.prose-section a {
  color: var(--fg);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.prose-section a:hover {
  color: var(--accent);
}

.article-header {
  padding: 3.5rem 0 2rem;
  border-bottom: 1px solid var(--border);
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.article-title {
  font-family: var(--font-macro);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.03em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  max-width: 24ch;
}

.article-meta {
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  color: var(--fg-muted);
}

.article-body {
  padding: 2.5rem 0 4rem;
}

.article-back {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  color: var(--fg-muted);
  margin-bottom: 2rem;
}

.article-back:hover {
  color: var(--accent);
}

.research-index-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.research-index-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  padding: 1.5rem;
  background: var(--bg);
  transition: background 0.2s ease;
}

@media (min-width: 768px) {
  .research-index-item {
    grid-template-columns: auto 1fr auto;
    align-items: center;
  }
}

.research-index-item:hover {
  background: var(--bg-elevated);
}

.research-index-item .research-tags {
  margin-bottom: 0.5rem;
}

.research-index-date {
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  color: var(--fg-muted);
  min-width: 6rem;
}

.subscribe-page {
  max-width: 36rem;
  padding: 3.5rem 0 4rem;
}

.subscribe-page .subscribe-band {
  margin-bottom: 0;
  grid-template-columns: 1fr;
}

.subscribe-page .subscribe-form-wrap {
  border-top: 1px solid var(--border);
}

.subscribe-page .page-header {
  border-bottom: none;
  padding-bottom: 0;
}

.article-body > .prose-section:first-child,
.article-body.prose-section {
  padding-top: 0;
  border-top: none;
}

.paper-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin: 1.25rem 0 0;
}

.paper-entry {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  padding: 1.25rem 1.5rem;
  background: var(--bg);
  transition: background 0.2s ease;
}

@media (min-width: 640px) {
  .paper-entry {
    grid-template-columns: 1fr auto;
    align-items: start;
    gap: 1.5rem;
  }
}

.paper-entry:hover {
  background: var(--bg-elevated);
}

.paper-entry-title {
  font-family: var(--font-macro);
  font-size: 0.9375rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.2;
  text-transform: none;
  margin-bottom: 0.35rem;
}

.paper-entry-title a {
  color: var(--fg);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--border);
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

.paper-entry-title a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

.paper-entry-note a {
  color: var(--fg);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.paper-entry-note a:hover {
  color: var(--accent);
}

.paper-entry-authors {
  font-size: 0.625rem;
  letter-spacing: 0.06em;
  text-transform: none;
  color: var(--fg-muted);
  margin-bottom: 0.5rem;
}

.paper-entry-note {
  font-size: 0.6875rem;
  letter-spacing: 0.02em;
  text-transform: none;
  line-height: 1.55;
  color: var(--fg-muted);
  max-width: 60ch;
}

.paper-entry-source {
  flex-shrink: 0;
  align-self: start;
  font-size: 0.5625rem;
  letter-spacing: 0.12em;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border);
  color: var(--fg-muted);
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.paper-entry-source:hover {
  color: var(--fg);
  border-color: var(--fg-muted);
}

.research-index-excerpt {
  font-size: 0.6875rem;
  letter-spacing: 0.02em;
  text-transform: none;
  line-height: 1.5;
  color: var(--fg-muted);
  margin-top: 0.5rem;
  max-width: 52ch;
}

.research-index-links {
  font-size: 0.5625rem;
  letter-spacing: 0.1em;
  color: var(--fg-muted);
  margin-top: 0.35rem;
}

/* ── 404 page ── */

.error-page {
  max-width: 42rem;
  padding: 3.5rem 0 4rem;
}

.error-page .page-header {
  border-bottom: none;
  padding-bottom: 2rem;
}

.error-code {
  font-family: var(--font-macro);
  font-size: clamp(4rem, 14vw, 7rem);
  font-weight: 900;
  line-height: 0.85;
  letter-spacing: -0.06em;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.error-page .subscribe-band {
  grid-template-columns: 1fr;
}

.error-page .explore-band-actions {
  flex-wrap: wrap;
}