/* ===========================================================
   A4 Labs — Design tokens
   Palette: deep violet (from mark) + warm ink + quiet neutrals
   Type: Fraunces (display, has personality) + IBM Plex Sans (body)
   =========================================================== */

:root {
  --bg:        #FBFAF7;
  --bg-alt:    #F2EFEA;
  --ink:       #17151F;
  --ink-soft:  #4B4756;
  --muted:     #837E8C;
  --rule:      #DEDAD2;
  --primary:   #5A3E85;
  --primary-2: #7C5CB3;
  --primary-dim: #EDE7F6;
  --white:     #FFFFFF;

  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --maxw: 1160px;
  --gap: 24px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

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

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 28px;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.12;
  margin: 0 0 0.4em;
  color: var(--ink);
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.4rem, 5vw, 3.6rem); font-weight: 500; }
h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); }
h3 { font-size: 1.3rem; }

p { margin: 0 0 1em; max-width: 62ch; color: var(--ink-soft); }

.lede {
  font-size: 1.2rem;
  color: var(--ink-soft);
  max-width: 52ch;
}

.rule {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 0;
}

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

header.site {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(251, 250, 247, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--ink);
}

.brand .mark {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  background: linear-gradient(155deg, var(--primary-2), var(--primary));
  display: inline-block;
}

.navlinks {
  display: flex;
  gap: 30px;
  font-size: 0.95rem;
}

.navlinks a {
  color: var(--ink-soft);
  padding: 4px 2px;
  border-bottom: 1px solid transparent;
  transition: color .15s ease, border-color .15s ease;
}

.navlinks a:hover,
.navlinks a[aria-current="page"] {
  color: var(--ink);
  border-color: var(--primary);
}

.navcta {
  border: 1px solid var(--ink);
  padding: 9px 18px;
  border-radius: 3px;
  font-size: 0.92rem;
  white-space: nowrap;
}
.navcta:hover { background: var(--ink); color: var(--white); }

.navtoggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.navtoggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  margin: 5px 0;
}

@media (max-width: 860px) {
  .navtoggle { display: block; }
  .navlinks {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--rule);
    flex-direction: column;
    gap: 0;
    padding: 8px 28px 20px;
  }
  .navlinks.open { display: flex; }
  .navlinks a { padding: 12px 0; border-bottom: 1px solid var(--rule); }
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 3px;
  font-size: 0.98rem;
  font-weight: 500;
  border: 1px solid transparent;
}

.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: #4A2F73; }

.btn-ghost { border-color: var(--ink); color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--white); }

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

section { padding: 88px 0; }
section.tight { padding: 56px 0; }
section.alt { background: var(--bg-alt); }

.eyebrow {
  font-size: 0.85rem;
  color: var(--primary);
  margin-bottom: 14px;
  font-weight: 500;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 40px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

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

.hero {
  padding: 76px 0 96px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.hero-copy .stats {
  display: flex;
  gap: 40px;
  margin-top: 40px;
}
.hero-copy .stat b {
  display: block;
  font-family: var(--serif);
  font-size: 1.9rem;
  color: var(--ink);
}
.hero-copy .stat span {
  font-size: 0.86rem;
  color: var(--muted);
}

.hero-cta { margin-top: 34px; display: flex; gap: 16px; }

/* diagram */
.flow-diagram { width: 100%; height: auto; }

/* ---------- Grids / cards (bordered, not shadowed) ---------- */

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.cell {
  background: var(--bg);
  padding: 36px 32px;
}
.cell .num {
  font-family: var(--serif);
  color: var(--primary-2);
  font-size: 0.95rem;
  margin-bottom: 18px;
  display: block;
}

/* Service / value list rows */
.rowlist { border-top: 1px solid var(--rule); }
.rowlist > div {
  border-bottom: 1px solid var(--rule);
  padding: 30px 0;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 32px;
}
.rowlist h3 { margin: 0; }
.rowlist .tag { color: var(--muted); font-size: 0.85rem; }

/* Team */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 36px;
}
.person-photo {
  aspect-ratio: 1;
  border-radius: 4px;
  background: var(--bg-alt);
  margin-bottom: 16px;
  position: relative;
  overflow: hidden;
}
.person-photo svg { width: 100%; height: 100%; }
.person h3 { font-size: 1.05rem; margin-bottom: 2px; }
.person .role { color: var(--primary); font-size: 0.88rem; margin-bottom: 8px; }
.person p { font-size: 0.92rem; }

/* Case studies */
.case-card {
  border: 1px solid var(--rule);
  padding: 40px;
  margin-bottom: 1px;
}
.case-card .industry { font-size: 0.85rem; color: var(--primary); margin-bottom: 12px; }
.case-metrics {
  display: flex;
  gap: 36px;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
}
.case-metrics b {
  display: block;
  font-family: var(--serif);
  font-size: 1.6rem;
}
.case-metrics span { font-size: 0.82rem; color: var(--muted); }

/* Blog */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}
.post .thumb {
  aspect-ratio: 16/10;
  background: var(--bg-alt);
  border-radius: 4px;
  margin-bottom: 18px;
  overflow: hidden;
}
.post .meta { font-size: 0.82rem; color: var(--muted); margin-bottom: 10px; }
.post h3 { font-size: 1.15rem; }

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
}
.field { margin-bottom: 20px; }
.field label {
  display: block;
  font-size: 0.86rem;
  color: var(--ink-soft);
  margin-bottom: 6px;
}
.field input, .field textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--rule);
  border-radius: 3px;
  background: var(--white);
  font-family: var(--sans);
  font-size: 0.98rem;
  color: var(--ink);
}
.field textarea { resize: vertical; min-height: 120px; }
.field input:focus, .field textarea:focus, a:focus-visible, button:focus-visible {
  outline: 2px solid var(--primary-2);
  outline-offset: 2px;
}

.info-line { display: flex; gap: 14px; padding: 16px 0; border-bottom: 1px solid var(--rule); }
.info-line .k { width: 110px; color: var(--muted); font-size: 0.88rem; }

/* CTA band */
.cta-band {
  background: var(--ink);
  color: var(--white);
  padding: 72px 0;
  text-align: left;
}
.cta-band h2 { color: var(--white); }
.cta-band p { color: #C9C4D1; }
.cta-band .btn-primary { background: var(--primary-2); }
.cta-band .btn-ghost { border-color: #63607a; color: var(--white); }
.cta-band .btn-ghost:hover { background: var(--white); color: var(--ink); }

/* ---------- Lead-capture CTA form ---------- */

.lead-cta {
  background: var(--ink);
  color: var(--white);
  padding: 72px 0;
}
.lead-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}
.lead-cta h2 { color: var(--white); }
.lead-cta p.lede { color: #C9C4D1; }
.lead-cta .info-line { border-bottom-color: #34303F; }
.lead-cta .info-line .k { color: #8C87A0; }

.lead-form .field label { color: #C9C4D1; }
.lead-form .field input,
.lead-form .field textarea {
  background: #211D2C;
  border-color: #3A354A;
  color: var(--white);
}
.lead-form .field input::placeholder,
.lead-form .field textarea::placeholder { color: #6E6A80; }
.lead-form .field input:focus,
.lead-form .field textarea:focus { outline-color: var(--primary-2); }

.lead-form button.btn-primary {
  background: var(--primary-2);
  border: none;
  width: 100%;
  cursor: pointer;
  font-family: var(--sans);
}
.lead-form button.btn-primary:hover { background: #8E6FC2; }
.lead-form button.btn-primary:disabled { opacity: 0.7; cursor: default; }

.form-note {
  font-size: 0.88rem;
  color: #A9A3BC;
  margin-top: 14px;
  min-height: 1.2em;
  opacity: 0;
  transition: opacity .2s ease;
}
.form-note.visible { opacity: 1; }

.form-fine {
  font-size: 0.82rem;
  color: #6E6A80;
  margin-top: 18px;
}

/* Footer */
footer.site {
  border-top: 1px solid var(--rule);
  padding: 56px 0 40px;
}
.foot-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}
.foot-grid h4 {
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 14px;
}
.foot-grid a, .foot-grid p {
  display: block;
  font-size: 0.92rem;
  color: var(--muted);
  margin-bottom: 10px;
}
.foot-grid a:hover { color: var(--primary); }
.foot-bottom {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--muted);
  padding-top: 24px;
  border-top: 1px solid var(--rule);
}

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

@media (max-width: 860px) {
  .navlinks { display: none; }
  .hero { grid-template-columns: 1fr; }
  .grid-3, .team-grid, .blog-grid { grid-template-columns: repeat(2, 1fr); }
  .grid-2, .contact-grid, .foot-grid { grid-template-columns: 1fr; }
  .rowlist > div { grid-template-columns: 1fr; gap: 10px; }
  .hero-copy .stats { flex-wrap: wrap; row-gap: 20px; }
}

@media (max-width: 560px) {
  .grid-3, .team-grid, .blog-grid { grid-template-columns: 1fr; }
  section { padding: 56px 0; }
}

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