/* =========================================================
   Avonstone — shared stylesheet
   ========================================================= */

:root {
  --black: #0e0e0d;
  --ink: #1a1a18;
  --white: #ffffff;
  --offwhite: #f8f7f4;
  --grey: #6b6a64;
  --line: #e4e2dc;
  --stone: #948d7c;      /* subtle brand accent, ties to "Avonstone" */
  --stone-dark: #6f6a5c;
  --maxw: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--offwhite);
  color: var(--ink);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, .logotype {
  font-family: 'Zilla Slab', 'Georgia', serif;
  font-weight: 600;
  color: var(--black);
  line-height: 1.15;
  margin: 0 0 0.5em;
}

p { margin: 0 0 1em; }

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

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

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 32px;
}

.eyebrow {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--stone-dark);
  margin-bottom: 0.9em;
  font-weight: 600;
}

.btn {
  display: inline-block;
  padding: 14px 30px;
  border: 1px solid var(--black);
  color: var(--black);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 600;
  transition: background 0.2s ease, color 0.2s ease;
}

.btn:hover { background: var(--black); color: var(--white); }

.btn-solid {
  background: var(--black);
  color: var(--white);
}

.btn-solid:hover { background: var(--stone-dark); border-color: var(--stone-dark); }

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 247, 244, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand img {
  height: 34px;
  width: auto;
}

.brand .logotype {
  font-size: 1.25rem;
  letter-spacing: 0.02em;
  margin: 0;
}

.main-nav ul {
  display: flex;
  gap: 40px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.main-nav a {
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--ink);
  position: relative;
  padding-bottom: 4px;
}

.main-nav a.active,
.main-nav a:hover { color: var(--black); }

.main-nav a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--stone);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--black);
  margin: 5px 0;
}

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

.hero {
  position: relative;
  overflow: hidden;
  padding: 120px 0 100px;
  border-bottom: 1px solid var(--line);
}

.hero-pattern {
  position: absolute;
  top: 50%;
  right: -10%;
  transform: translateY(-50%);
  width: 900px;
  max-width: 70vw;
  opacity: 0.05;
  pointer-events: none;
  z-index: 0;
}

.hero .container { position: relative; z-index: 1; }

.hero-content { max-width: 680px; }

.hero h1 {
  font-size: clamp(2.2rem, 4.4vw, 3.4rem);
}

.hero p.lead {
  font-size: 1.15rem;
  color: var(--grey);
  max-width: 560px;
}

.hero-actions {
  margin-top: 32px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---------- Sections ---------- */

section { padding: 96px 0; }

section.alt { background: var(--white); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.section-head {
  max-width: 640px;
  margin: 0 0 56px;
}

.section-head h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); }

.section-head p { color: var(--grey); font-size: 1.05rem; }

/* three-column insight grid */

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
}

.insight-card { border-top: 2px solid var(--black); padding-top: 20px; }

.insight-card h3 { font-size: 1.15rem; }

.insight-card p { color: var(--grey); font-size: 0.98rem; }

/* pull statement / approach */

.pull-statement {
  border-left: 3px solid var(--stone);
  padding-left: 32px;
  max-width: 760px;
}

.pull-statement p {
  font-family: 'Zilla Slab', Georgia, serif;
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  color: var(--black);
  line-height: 1.4;
  margin: 0;
}

/* case study teaser cards */

.grid-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.case-card {
  display: block;
  border: 1px solid var(--line);
  background: var(--white);
  padding: 28px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.case-card:hover { border-color: var(--stone); transform: translateY(-3px); }

.case-card .eyebrow { margin-bottom: 1.4em; }

.case-card h3 { font-size: 1.1rem; margin-bottom: 0.4em; }

.case-card p { color: var(--grey); font-size: 0.92rem; margin: 0; }

.section-foot-link {
  margin-top: 48px;
  text-align: center;
}

.section-foot-link a {
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 600;
  border-bottom: 1px solid var(--black);
  padding-bottom: 3px;
}

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

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 72px;
}

.contact-details h3 {
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--stone-dark);
  margin-bottom: 0.6em;
}

.contact-details .detail-block { margin-bottom: 36px; }

.contact-details p { margin: 0; color: var(--ink); }
.contact-details p.muted { color: var(--grey); font-size: 0.92rem; }

form.contact-form label {
  display: block;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--grey);
  margin-bottom: 8px;
}

.form-row { margin-bottom: 24px; }

.form-row-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

form.contact-form input,
form.contact-form textarea,
form.contact-form select {
  width: 100%;
  padding: 13px 16px;
  border: 1px solid var(--line);
  background: var(--white);
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--ink);
}

form.contact-form input:focus,
form.contact-form textarea:focus,
form.contact-form select:focus {
  outline: none;
  border-color: var(--stone);
}

form.contact-form textarea { resize: vertical; min-height: 140px; }

.form-note {
  font-size: 0.82rem;
  color: var(--grey);
  margin-top: 16px;
}

/* ---------- Placeholder / case study page ---------- */

.placeholder-block {
  border: 1px dashed var(--line);
  background: var(--white);
  padding: 64px 40px;
  text-align: center;
  color: var(--grey);
}

.placeholder-block strong { color: var(--ink); display: block; margin-bottom: 8px; }

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

.site-footer {
  border-top: 1px solid var(--line);
  padding: 56px 0 40px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 32px;
  margin-bottom: 40px;
}

.footer-nav ul {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 0;
}

.footer-nav a {
  font-size: 0.85rem;
  color: var(--grey);
}

.footer-nav a:hover { color: var(--black); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--grey);
  border-top: 1px solid var(--line);
  padding-top: 24px;
}

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

@media (max-width: 860px) {
  .grid-3, .grid-cards { grid-template-columns: 1fr; }
  .contact-layout { grid-template-columns: 1fr; }
  .form-row-split { grid-template-columns: 1fr; }

  .main-nav { display: none; }
  .nav-toggle { display: block; }

  .site-header.nav-open .main-nav {
    display: block;
    position: absolute;
    top: 84px;
    left: 0; right: 0;
    background: var(--offwhite);
    border-bottom: 1px solid var(--line);
    padding: 16px 0;
  }

  .site-header.nav-open .main-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 0 32px;
  }

  .site-header.nav-open .main-nav li { padding: 14px 0; border-bottom: 1px solid var(--line); }

  .hero { padding: 80px 0 64px; }
  section { padding: 64px 0; }
}