/* Sterling Birchmond LLC — site stylesheet */

:root {
  --bg: #FAFAF7;
  --ink: #1A1A1A;
  --ink-muted: #5A5A55;
  --rule: #D8D6CF;
  --rule-soft: #ECEAE2;
  --accent: #1E2A3A;
  --measure: 62ch;
  --page-max: 1180px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --serif: "Libre Caslon Text", "Cormorant Garamond", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

body.service-page {
  --page-max: 1120px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  font-weight: 400;
  letter-spacing: 0.005em;
}

/* ---------- Typography ---------- */

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.005em;
  line-height: 1.2;
  margin: 0 0 0.6em;
}

h1 {
  font-size: clamp(2.25rem, 4.6vw, 3.5rem);
  letter-spacing: -0.015em;
}

h2 {
  font-size: clamp(1.6rem, 2.6vw, 2.15rem);
  margin-top: 0;
}

h3 {
  font-size: 1.2rem;
  font-family: var(--sans);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ink);
}

p {
  margin: 0 0 1.15em;
  max-width: var(--measure);
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 120ms ease, color 120ms ease;
}

a:hover,
a:focus-visible {
  border-bottom-color: var(--accent);
}

.eyebrow {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 1.5rem;
}

.lede {
  font-family: var(--serif);
  font-size: clamp(1.2rem, 1.7vw, 1.4rem);
  line-height: 1.55;
  color: var(--ink);
  max-width: 56ch;
}

/* ---------- Layout primitives ---------- */

.container {
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section {
  padding: clamp(3rem, 7vw, 6rem) 0;
}

.section--tight {
  padding: clamp(2rem, 4vw, 3.5rem) 0;
}

.rule {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 0;
}

/* ---------- Site header / navigation ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: saturate(1.2) blur(10px);
  -webkit-backdrop-filter: saturate(1.2) blur(10px);
  border-bottom: 1px solid var(--rule-soft);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 72px;
  padding-top: 0.85rem;
  padding-bottom: 0.85rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  color: var(--ink);
  border-bottom: 0;
  line-height: 0;
}

.brand:hover,
.brand:focus-visible {
  border-bottom: 0;
  opacity: 0.8;
}

.brand-logo {
  display: block;
  height: 54px;
  width: auto;
  max-width: 100%;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.9rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-family: var(--sans);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ink);
}

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

.nav-toggle {
  display: none;
  background: transparent;
  border: 0;
  padding: 0.35rem 0;
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  cursor: pointer;
}

/* ---------- About page monogram (optional inside .page-header) ---------- */

.page-header__monogram {
  display: block;
  width: clamp(200px, 24vw, 300px);
  height: auto;
  margin: 0 0 clamp(1.75rem, 3.5vw, 2.75rem);
}

/* ---------- Page header (editorial, non-home pages) ---------- */

.page-header {
  padding: clamp(3.5rem, 6.5vw, 6rem) 0 clamp(2.5rem, 4.5vw, 4rem);
  border-bottom: 1px solid var(--rule-soft);
}

.page-header .eyebrow {
  display: block;
  font-size: clamp(0.82rem, 0.95vw, 0.95rem);
  letter-spacing: 0.18em;
  color: var(--ink-muted);
  margin-bottom: clamp(1.25rem, 2.5vw, 2rem);
}

.page-header h1 {
  font-size: clamp(2.75rem, 5.8vw, 4.75rem);
  line-height: 1.04;
  letter-spacing: -0.028em;
  max-width: none;
  margin: 0;
  font-weight: 400;
  font-feature-settings: "kern" 1, "liga" 1;
}

.page-header__rule {
  border: 0;
  border-top: 1px solid var(--ink);
  margin: clamp(2rem, 3.5vw, 3rem) 0 clamp(1.75rem, 3vw, 2.5rem);
  width: 100%;
}

.page-header .lede {
  font-size: clamp(1.1rem, 1.3vw, 1.25rem);
  line-height: 1.6;
  max-width: none;
  margin: 0 0 1.1rem;
  text-align: justify;
  text-justify: inter-word;
  hyphens: auto;
  -webkit-hyphens: auto;
  color: var(--ink);
}

.page-header .lede:last-of-type {
  margin-bottom: 0;
  color: var(--ink-muted);
}

/* ---------- Hero ---------- */

.hero {
  padding: clamp(4rem, 10vw, 8rem) 0 clamp(3rem, 6vw, 5rem);
  border-bottom: 1px solid var(--rule-soft);
}

.hero__lockup {
  margin: 0 0 clamp(3rem, 6vw, 5rem);
  line-height: 0;
}

.hero__logo {
  display: block;
  width: clamp(260px, 36vw, 480px);
  height: auto;
}

.hero__positioning {
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2vw, 1.55rem);
  line-height: 1.45;
  color: var(--ink-muted);
  max-width: 48ch;
  margin: 0;
}

/* ---------- Intro / prose blocks ---------- */

.prose {
  max-width: var(--measure);
}

.prose p,
.prose .lede,
.capability__body p,
.capability-card__body,
.panel__intro,
.definition-grid dd {
  text-align: justify;
  text-justify: inter-word;
  hyphens: auto;
  -webkit-hyphens: auto;
}

.prose p + p {
  margin-top: 0;
}

/* ---------- Service pillar cards (home) ---------- */

.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.pillar {
  display: flex;
  flex-direction: column;
  padding: 2.5rem 2rem 2.25rem;
  border-right: 1px solid var(--rule);
  background: transparent;
  transition: background 160ms ease;
}

.pillar:last-child {
  border-right: 0;
}

.pillar:hover {
  background: var(--rule-soft);
}

.pillar__number {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 1.75rem;
}

.pillar__title {
  font-family: var(--serif);
  font-size: 1.5rem;
  line-height: 1.2;
  margin: 0 0 0.85rem;
}

.pillar__desc {
  font-size: 0.98rem;
  color: var(--ink-muted);
  line-height: 1.6;
  margin: 0 0 1.75rem;
  max-width: none;
}

.pillar__link {
  margin-top: auto;
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  border-bottom: 0;
}

.pillar__link::after {
  content: " \2192";
}

.pillar__link:hover,
.pillar__link:focus-visible {
  border-bottom: 0;
  opacity: 0.75;
}

/* ---------- Two-column section (label + body) ---------- */

.split {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: clamp(2rem, 6vw, 5rem);
  align-items: start;
}

.split__label {
  font-family: var(--sans);
  font-size: clamp(1.05rem, 1.4vw, 1.3rem);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  padding-top: 0.35rem;
}

/* ---------- Capability blocks (service pages) ---------- */

.capabilities {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--rule);
}

.capability {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: clamp(2rem, 6vw, 5rem);
  padding: 2.25rem 0;
  border-bottom: 1px solid var(--rule);
}

.capability__title {
  font-family: var(--serif);
  font-size: 1.25rem;
  line-height: 1.3;
  margin: 0;
}

.capability__body {
  color: var(--ink-muted);
  line-height: 1.7;
  max-width: 60ch;
}

.capability__body p {
  margin: 0;
  max-width: none;
}


/* ---------- Panel (reusable section block: title + content) ---------- */

.panel {
  padding-block: clamp(2.5rem, 5vw, 4rem);
  border-bottom: 1px solid var(--rule-soft);
}

.panel:first-child {
  padding-top: 0;
}

.panel:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.panel__header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--ink);
}

.panel__title {
  font-family: var(--serif);
  font-size: clamp(1.25rem, 1.6vw, 1.5rem);
  margin: 0 0 0.55rem;
  font-weight: 400;
  letter-spacing: -0.005em;
}

.panel__intro {
  font-family: var(--sans);
  font-size: 1.05rem;
  color: var(--ink);
  line-height: 1.5;
  margin: 0;
  max-width: 62ch;
}

/* Split variant: title + intro on left column, body on right column */
.panel--split {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}

.panel--split .panel__header {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: 0;
  padding-top: 0.35rem;
}

.panel--split .panel__title {
  margin-bottom: 0.5rem;
}

.panel--split .panel__intro {
  max-width: none;
  font-size: 1rem;
  color: var(--ink-muted);
}

.panel--split .prose,
.panel--split .prose p,
.panel--split .prose .lede {
  max-width: none;
}

/* ---------- Capability grid (cards, 2 or 3 columns) ---------- */

.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(2rem, 3vw, 3rem) clamp(2.25rem, 3.5vw, 3.5rem);
}

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

.capability-card {
  padding: 0;
  display: flex;
  flex-direction: column;
}

.capability-card__title {
  font-family: var(--serif);
  font-size: clamp(1.05rem, 1.25vw, 1.2rem);
  line-height: 1.35;
  margin: 0 0 0.75rem;
  min-height: calc(1.35em * 2);
  color: var(--ink);
  font-weight: 400;
}

.capability-card__body {
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--ink-muted);
  margin: 0;
  max-width: none;
  text-align: left;
}

/* ---------- Definition grid (engagement model) ---------- */

.definition-grid {
  display: grid;
  grid-template-columns: 1fr 3fr;
  gap: 0;
  margin: 0;
  border-top: 1px solid var(--rule);
}

.definition-grid dt {
  padding: 1.5rem clamp(2rem, 6vw, 5rem) 1.5rem 0;
  border-bottom: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.definition-grid dd {
  padding: 1.5rem 0;
  margin: 0;
  border-bottom: 1px solid var(--rule);
  color: var(--ink);
  line-height: 1.6;
  max-width: none;
}

/* ---------- Contact block ---------- */

.contact-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 6vw, 5rem);
  padding-top: 2rem;
  border-top: 1px solid var(--rule);
}

.contact-block dt {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 0.55rem;
}

.contact-block dd {
  margin: 0 0 1.75rem;
  font-family: var(--serif);
  font-size: 1.15rem;
  line-height: 1.5;
  color: var(--ink);
}

.contact-block dd a {
  color: var(--ink);
  border-bottom: 1px solid var(--rule);
}

.contact-block dd a:hover,
.contact-block dd a:focus-visible {
  border-bottom-color: var(--accent);
  color: var(--accent);
}

/* ---------- Contact form ---------- */

.contact-form {
  display: grid;
  gap: 1.5rem;
  max-width: none;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.form-row label {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.form-row input,
.form-row select,
.form-row textarea {
  font-family: var(--sans);
  font-size: 1rem;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--rule);
  padding: 0.55rem 0;
  line-height: 1.5;
  transition: border-color 160ms ease;
  width: 100%;
  border-radius: 0;
  -webkit-appearance: none;
  appearance: none;
}

.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  outline: none;
  border-bottom-color: var(--ink);
}

.form-row textarea {
  resize: vertical;
  min-height: 140px;
  line-height: 1.6;
}

.form-row select {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8'><path d='M1 1l5 5 5-5' fill='none' stroke='%231A1A1A' stroke-width='1.4' stroke-linecap='round' stroke-linejoin='round'/></svg>");
  background-repeat: no-repeat;
  background-position: right 0.25rem center;
  background-size: 12px 8px;
  padding-right: 1.75rem;
  cursor: pointer;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 640px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
}

.form-submit {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bg);
  background: var(--ink);
  border: 0;
  padding: 1rem 2.25rem;
  cursor: pointer;
  transition: background 160ms ease;
  align-self: flex-start;
  justify-self: start;
  margin-top: 0.75rem;
}

.form-submit:hover,
.form-submit:focus-visible {
  background: var(--accent);
  outline: none;
}

.form-honeypot {
  position: absolute;
  left: -9999px;
  opacity: 0;
  pointer-events: none;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--rule);
  padding: 2.25rem 0 2.5rem;
  margin-top: clamp(3rem, 6vw, 5rem);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1.5rem;
  font-size: 0.78rem;
  color: var(--ink-muted);
  line-height: 1.6;
}

.site-footer__legal {
  max-width: 62ch;
}

.site-footer__legal strong {
  font-weight: 500;
  color: var(--ink);
}

.site-footer__meta {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
  text-align: right;
}

.site-footer a {
  color: var(--ink-muted);
  border-bottom: 1px solid transparent;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---------- Responsive ---------- */

@media (max-width: 860px) {
  .pillars {
    grid-template-columns: 1fr;
  }

  .pillar {
    border-right: 0;
    border-bottom: 1px solid var(--rule);
    padding: 2rem 0;
  }

  .pillar:last-child {
    border-bottom: 0;
  }

  .split,
  .capability,
  .contact-block,
  .panel--split {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .panel--split .panel__header {
    padding-top: 0;
  }

  .split__label {
    padding-top: 0;
  }

  .capability-grid,
  .capability-grid--two {
    grid-template-columns: 1fr;
  }

  .definition-grid {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .definition-grid dt {
    padding-bottom: 0.15rem;
    border-bottom: 0;
  }

  .definition-grid dd {
    padding-top: 0.3rem;
  }
}

@media (max-width: 720px) {
  body {
    font-size: 16px;
  }

  .brand-logo {
    height: 44px;
  }

  .nav-toggle {
    display: inline-block;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 0.5rem var(--gutter) 1.5rem;
    background: var(--bg);
    border-bottom: 1px solid var(--rule-soft);
    max-height: 0;
    overflow: hidden;
    transition: max-height 220ms ease;
  }

  .nav-links[data-open="true"] {
    max-height: 420px;
  }

  .nav-links li {
    width: 100%;
    border-bottom: 1px solid var(--rule-soft);
  }

  .nav-links li:last-child {
    border-bottom: 0;
  }

  .nav-links a {
    display: block;
    padding: 0.95rem 0;
    font-size: 0.95rem;
  }

  .site-footer__inner {
    flex-direction: column;
  }

  .site-footer__meta {
    text-align: left;
  }
}

/* ---------- Scroll reveal (scoped to JS + no-preference) ---------- */

@media (prefers-reduced-motion: no-preference) {
  .js .reveal {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 620ms cubic-bezier(0.22, 0.61, 0.36, 1) var(--reveal-delay, 0ms),
                transform 620ms cubic-bezier(0.22, 0.61, 0.36, 1) var(--reveal-delay, 0ms);
    will-change: opacity, transform;
  }

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

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}