/* ==========================================================================
   Libra Research — main stylesheet
   Identity: ink #1B1A17 on paper #F7F5F0, strict monochrome.
   Type: Spectral (serif) / IBM Plex Mono (mono).
   ========================================================================== */

:root {
  --ink: #1b1a17;
  --paper: #f7f5f0;
  --cell: #fbfaf6;
  --hair: rgba(27, 26, 23, 0.15);
  --hair-strong: rgba(27, 26, 23, 0.32);
  --muted: rgba(27, 26, 23, 0.54);
  --body: rgba(27, 26, 23, 0.78);
  --accent: #9a4632;
  --accent: oklch(0.47 0.13 27);
  --hair-rev: rgba(247, 245, 240, 0.18);
  --muted-rev: rgba(247, 245, 240, 0.6);
  --body-rev: rgba(247, 245, 240, 0.78);
  --serif: "Spectral", Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", monospace;
  --col: 1120px;
  --gutter: 56px;
}

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

html {
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.6;
  font-feature-settings: "liga" 1, "kern" 1;
}

h1, h2, h3, p, ul {
  margin: 0;
}

a {
  color: inherit;
}

.wrap {
  max-width: var(--col);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

@media (max-width: 720px) {
  :root {
    --gutter: 24px;
  }
}

/* ---- type primitives ---- */

.mono {
  font-family: var(--mono);
}

.kicker {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--muted);
}

.num {
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.22em;
  color: var(--muted);
  white-space: nowrap;
}

/* ---- marks ---- */

.mk {
  display: block;
  width: 100%;
  height: 100%;
  color: inherit;
}

/* ---- skip link ---- */

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  background: var(--paper);
  color: var(--ink);
  padding: 12px 20px;
}

.skip:focus {
  left: 0;
}

/* ---- focus ---- */

:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
}

/* ==========================================================================
   Navigation
   ========================================================================== */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--ink);
  color: var(--paper);
  border-bottom: 1px solid var(--hair-rev);
}

.nav-inner {
  max-width: var(--col);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
}

.nav-logo .mk {
  width: 32px;
  height: 32px;
  flex: none;
}

.nav-logo .words {
  display: flex;
  flex-direction: column;
}

.nav-logo .nm {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 19px;
  line-height: 1;
  letter-spacing: -0.01em;
}

.nav-logo .ds {
  font-family: var(--mono);
  font-size: 8.5px;
  font-weight: 500;
  letter-spacing: 0.38em;
  text-transform: uppercase;
  color: var(--muted-rev);
  margin-top: 4px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
  margin-left: auto;
}

.nav-links a {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--muted-rev);
  text-decoration: none;
  transition: color 0.15s;
}

.nav-links a:hover {
  color: var(--paper);
}

.nav-cta {
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--paper);
  text-decoration: none;
  border: 1px solid var(--hair-rev);
  padding: 10px 18px;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.nav-cta:hover {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--paper);
}

/* mobile menu */

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--hair-rev);
  color: var(--paper);
  width: 44px;
  height: 44px;
  padding: 0;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.nav-toggle svg {
  display: block;
}

.nav-toggle .icon-close {
  display: none;
}

.nav-toggle[aria-expanded="true"] .icon-open {
  display: none;
}

.nav-toggle[aria-expanded="true"] .icon-close {
  display: block;
}

.nav-menu {
  display: contents;
}

@media (max-width: 760px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--ink);
    border-bottom: 1px solid var(--hair-rev);
    padding: 8px var(--gutter) 28px;
  }

  .nav-menu.is-open {
    display: block;
  }

  .nav-links {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    margin: 0;
  }

  .nav-links a {
    display: block;
    width: 100%;
    padding: 16px 0;
    border-bottom: 1px solid var(--hair-rev);
    font-size: 12px;
  }

  .nav-cta {
    display: inline-block;
    margin-top: 24px;
  }
}

/* ==========================================================================
   Masthead / hero  (ink)
   ========================================================================== */

.mast {
  background: var(--ink);
  color: var(--paper);
}

.mast-inner {
  max-width: var(--col);
  margin: 0 auto;
  padding: 96px var(--gutter) 56px;
}

.mast-hero {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 72px;
  align-items: start;
  padding-bottom: 52px;
  border-bottom: 1px solid var(--hair-rev);
}

.mast-hero .kicker {
  color: var(--muted-rev);
  display: block;
  margin-bottom: 30px;
}

.mast-hero h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(52px, 9vw, 110px);
  line-height: 1;
  letter-spacing: -0.022em;
  margin-left: -0.02em;
}

.mast-sub {
  font-size: clamp(17px, 1.8vw, 20px);
  line-height: 1.6;
  color: var(--body-rev);
  max-width: 52ch;
  margin-top: 30px;
}

.mast-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 44px;
}

.mast-stats {
  display: flex;
  flex-direction: column;
}

@media (max-width: 860px) {
  .mast-hero {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .mast-inner {
    padding-top: 72px;
  }
}

/* buttons */

.btn {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-decoration: none;
  display: inline-block;
  padding: 15px 28px;
  transition: opacity 0.15s, border-color 0.15s, background 0.15s, color 0.15s;
}

.btn-solid {
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--paper);
}

.btn-solid:hover {
  opacity: 0.85;
}

.btn-ghost {
  background: transparent;
  color: var(--paper);
  border: 1px solid var(--hair-rev);
}

.btn-ghost:hover {
  border-color: rgba(247, 245, 240, 0.5);
}

/* stat badges — hero right column */

.mast-stats .stat {
  border-top: 1px solid var(--hair-rev);
  padding: 16px 0;
}

.mast-stats .kicker {
  color: var(--muted-rev);
  display: block;
}

.mast-stats .val {
  font-family: var(--serif);
  font-size: 18px;
  color: var(--paper);
  margin-top: 8px;
}

@media (max-width: 860px) {
  .mast-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    column-gap: 32px;
  }
}

@media (max-width: 480px) {
  .mast-stats {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   Section scaffold
   ========================================================================== */

section {
  padding: 104px 0;
}

@media (max-width: 720px) {
  section {
    padding: 64px 0;
  }
}

.sec-head {
  margin-bottom: 60px;
}

.sec-head .sec-label {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 18px;
}

.sec-head .sec-label .num {
  border-left: 2px solid var(--ink);
  padding-left: 10px;
  font-size: 12px;
  letter-spacing: 0.24em;
}

.sec-head .sec-label .line {
  flex: 1;
  height: 1px;
  background: var(--hair);
}

.sec-head h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin-top: 0;
}

.sec-head .lede {
  font-size: 18px;
  line-height: 1.65;
  color: var(--body);
  max-width: 56ch;
  margin-top: 20px;
}

/* ==========================================================================
   Services  (paper)
   ========================================================================== */

.services-grid {
  border-bottom: 1px solid var(--hair);
}

.svc {
  display: grid;
  grid-template-columns: 48px 1fr minmax(120px, 200px);
  gap: 28px;
  align-items: baseline;
  border-top: 1px solid var(--hair);
  padding: 28px 0;
}

.svc-num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--muted);
}

.svc-main h3 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(20px, 2.4vw, 27px);
  line-height: 1.1;
  letter-spacing: -0.018em;
}

.svc-desc {
  font-family: var(--serif);
  font-style: italic;
  font-size: 15.5px;
  line-height: 1.5;
  color: var(--body);
  margin-top: 10px;
  max-width: 62ch;
}

.svc-price {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--accent);
  text-align: right;
}

@media (max-width: 640px) {
  .svc {
    grid-template-columns: 1fr auto;
    gap: 6px 16px;
    align-items: start;
  }

  .svc-num {
    grid-column: 1;
    grid-row: 1;
  }

  .svc-price {
    grid-column: 2;
    grid-row: 1;
    text-align: right;
  }

  .svc-main {
    grid-column: 1 / -1;
    grid-row: 2;
    margin-top: 8px;
  }
}

/* ==========================================================================
   Methodology  (cell band)
   ========================================================================== */

.how {
  background: var(--cell);
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
}


.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 8px;
}

.step {
  position: relative;
  padding: 36px 28px 0 0;
}

.step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 9px;
  height: 9px;
  background: var(--accent);
}

.step::after {
  content: "";
  position: absolute;
  top: 4px;
  left: 9px;
  right: 0;
  height: 1px;
  background: var(--hair-strong);
}

.step:last-child::after {
  display: none;
}

.step-n {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--muted);
  margin-bottom: 16px;
}

.step h3 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.2;
  letter-spacing: -0.018em;
  margin-bottom: 10px;
}

.step p {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--body);
}

@media (max-width: 720px) {
  .steps {
    grid-template-columns: 1fr;
  }

  .step {
    padding: 0 0 34px 28px;
  }

  .step::before {
    top: 4px;
  }

  .step::after {
    top: 13px;
    left: 4px;
    right: auto;
    bottom: 0;
    width: 1px;
    height: auto;
  }

  .step:last-child {
    padding-bottom: 0;
  }
}

/* ==========================================================================
   Clients  (paper)
   ========================================================================== */

.clients-band {
  background: var(--cell);
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
  padding: 28px 24px;
}

.clients-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
}

.client {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--body);
  white-space: nowrap;
  padding: 6px 0;
}

.client:not(:last-child)::after {
  content: "|";
  color: var(--hair-strong);
  margin: 0 22px;
  font-weight: 400;
}

@media (max-width: 560px) {
  .client {
    margin: 0 14px;
  }

  .client:not(:last-child)::after {
    display: none;
  }
}

/* ==========================================================================
   About  (paper)
   ========================================================================== */

.about-grid {
  display: block;
}

.about-text {
  max-width: 72ch;
}

.about-text p {
  font-size: 17px;
  line-height: 1.75;
  color: var(--body);
}

.about-text p + p {
  margin-top: 20px;
}

.principles {
  list-style: none;
  padding: 0;
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--hair);
  border-left: 1px solid var(--hair);
}

.principle {
  border-right: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
  padding: 28px 26px 32px;
}

.principle .p-name {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--ink);
}

.principle .p-desc {
  font-family: var(--serif);
  font-style: normal;
  font-size: 16px;
  line-height: 1.5;
  color: var(--body);
  margin-top: 12px;
}

@media (max-width: 700px) {
  .principles {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   Contact  (ink)
   ========================================================================== */

.contact {
  background: var(--ink);
  color: var(--paper);
  position: relative;
  overflow: hidden;
}

.contact-wm {
  position: absolute;
  right: -6%;
  bottom: -18%;
  width: clamp(280px, 38vw, 520px);
  aspect-ratio: 1;
  color: var(--paper);
  opacity: 0.05;
  pointer-events: none;
}

.contact .wrap {
  position: relative;
}

.contact .sec-label .num,
.contact .sec-label .kicker {
  color: var(--muted-rev);
}

.contact .sec-label .num {
  border-left-color: var(--paper);
}

.contact .sec-label .line {
  background: var(--hair-rev);
}

.contact .sec-head .lede {
  color: var(--body-rev);
}

.contact-links {
  display: flex;
  flex-direction: column;
  max-width: 560px;
  margin-top: 8px;
  border-top: 1px solid var(--hair-rev);
}

.contact-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--hair-rev);
  text-decoration: none;
  transition: opacity 0.15s;
}

a.contact-link:hover {
  opacity: 0.65;
}

.contact-link .cl-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted-rev);
  margin-bottom: 6px;
}

.contact-link .cl-val {
  font-size: 17px;
}

.contact-link .cl-arr {
  font-family: var(--mono);
  font-size: 18px;
  color: var(--muted-rev);
}

/* ==========================================================================
   Footer  (ink)
   ========================================================================== */

footer {
  background: var(--ink);
  color: var(--muted-rev);
  border-top: 1px solid var(--hair-rev);
  padding: 30px 0;
}

.footer-inner {
  max-width: var(--col);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--paper);
  text-decoration: none;
}

.footer-logo .mk {
  width: 22px;
  height: 22px;
}

.footer-logo .wm {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.01em;
}

.footer-copy {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

/* ==========================================================================
   Scroll reveal
   ========================================================================== */

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: var(--d, 0s);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}