/* ============================================================
   fstacks — shared stylesheet
   Palette: Ink #0D1321 · Porcelain #F2F4F1 · Copper #C97B3D
            Slate #3E4C5E · Mist #8FA3B8
   Type:    Space Grotesk (display) · IBM Plex Sans (body)
            IBM Plex Mono (utility)
   ============================================================ */

:root {
  --ink: #0D1321;
  --ink-soft: #16203A;
  --porcelain: #F2F4F1;
  --white: #FFFFFF;
  --slate: #3E4C5E;
  --mist: #8FA3B8;
  --copper: #C97B3D;
  --copper-dark: #A9622A;
  --line-light: rgba(13, 19, 33, 0.12);
  --line-dark: rgba(255, 255, 255, 0.14);

  --font-display: "Space Grotesk", sans-serif;
  --font-body: "IBM Plex Sans", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --max-w: 1140px;
  --radius: 10px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--porcelain);
  color: var(--ink);
  line-height: 1.65;
  font-size: 16.5px;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

a { color: inherit; }

::selection { background: var(--copper); color: var(--white); }

/* ---------- utility type ---------- */

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--copper);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--copper);
  display: inline-block;
}

h1, h2, h3 { font-family: var(--font-display); line-height: 1.12; letter-spacing: -0.015em; }

h2.section-title {
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  margin: 14px 0 18px;
  max-width: 620px;
}

.section-lead {
  color: var(--slate);
  max-width: 640px;
}

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(13, 19, 33, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-dark);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  color: var(--white);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.28rem;
  letter-spacing: -0.01em;
}

/* logo: three stacked bars — the "stack" */
.brand-mark {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 22px;
}
.brand-mark span {
  height: 5px;
  border-radius: 2px;
  background: var(--mist);
}
.brand-mark span:nth-child(1) { width: 60%; background: var(--copper); }
.brand-mark span:nth-child(2) { width: 85%; }
.brand-mark span:nth-child(3) { width: 100%; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
  list-style: none;
}
.nav-links a {
  color: var(--mist);
  text-decoration: none;
  font-size: 0.92rem;
  transition: color 0.18s ease;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] { color: var(--white); }

.nav-cta {
  font-family: var(--font-mono);
  font-size: 0.8rem !important;
  color: var(--ink) !important;
  background: var(--copper);
  padding: 9px 18px;
  border-radius: 6px;
  transition: background 0.18s ease;
}
.nav-cta:hover { background: #E09354; }

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--white);
  margin: 5px 0;
}

/* ---------- hero (dark) ---------- */

.hero {
  background:
    radial-gradient(900px 420px at 85% -10%, rgba(201, 123, 61, 0.16), transparent 60%),
    var(--ink);
  color: var(--white);
  padding: 92px 0 100px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 64px;
  align-items: center;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  margin: 18px 0 20px;
}
.hero h1 em {
  font-style: normal;
  color: var(--copper);
}

.hero p.lede {
  color: var(--mist);
  font-size: 1.08rem;
  max-width: 520px;
  margin-bottom: 34px;
}

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  padding: 14px 26px;
  border-radius: 7px;
  transition: transform 0.15s ease, background 0.18s ease, border-color 0.18s ease;
}
.btn:active { transform: translateY(1px); }

.btn-primary { background: var(--copper); color: var(--ink); }
.btn-primary:hover { background: #E09354; }

.btn-ghost {
  border: 1px solid var(--line-dark);
  color: var(--white);
}
.btn-ghost:hover { border-color: var(--copper); color: var(--copper); }

.btn-dark { background: var(--ink); color: var(--white); }
.btn-dark:hover { background: var(--ink-soft); }

/* ---------- the stack (signature element) ---------- */

.stack-visual {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.stack-layer {
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  padding: 18px 22px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  opacity: 0;
  transform: translateX(28px);
  animation: layer-in 0.6s ease forwards;
}
.stack-layer:nth-child(1) { animation-delay: 0.15s; }
.stack-layer:nth-child(2) { animation-delay: 0.3s; }
.stack-layer:nth-child(3) { animation-delay: 0.45s; }
.stack-layer:nth-child(4) { animation-delay: 0.6s; }

.stack-layer strong {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 500;
  color: var(--white);
}
.stack-layer span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mist);
  text-align: right;
  white-space: nowrap;
}
.stack-layer.accent {
  border-color: rgba(201, 123, 61, 0.55);
  background: rgba(201, 123, 61, 0.1);
}
.stack-layer.accent strong { color: var(--copper); }

@keyframes layer-in {
  to { opacity: 1; transform: translateX(0); }
}

@media (prefers-reduced-motion: reduce) {
  .stack-layer { animation: none; opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}

/* ---------- sections ---------- */

section.block { padding: 88px 0; }
section.block.tint { background: var(--white); }

/* services grid */
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  margin-top: 44px;
}

.card {
  background: var(--white);
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}
.tint .card { background: var(--porcelain); }
.card:hover {
  transform: translateY(-4px);
  border-color: var(--copper);
  box-shadow: 0 14px 30px rgba(13, 19, 33, 0.08);
}

.card .card-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--copper);
}
.card h3 {
  font-size: 1.18rem;
  margin: 12px 0 10px;
  font-weight: 500;
}
.card p { color: var(--slate); font-size: 0.94rem; }

/* process (numbered — genuine sequence) */
.process {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin-top: 48px;
  border-top: 1px solid var(--line-light);
}
.step {
  padding: 30px 26px 6px 0;
  border-left: 1px solid var(--line-light);
  padding-left: 26px;
}
.step:first-child { border-left: 0; padding-left: 0; }
.step .num {
  font-family: var(--font-mono);
  color: var(--copper);
  font-size: 0.8rem;
}
.step h3 { font-size: 1.05rem; margin: 10px 0 8px; font-weight: 500; }
.step p { color: var(--slate); font-size: 0.9rem; }

/* capability strip */
.strip {
  background: var(--ink);
  color: var(--white);
  padding: 64px 0;
}
.strip-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 34px;
}
.stat .stat-value {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--copper);
}
.stat .stat-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
  margin-top: 6px;
}

/* CTA band */
.cta-band {
  background: var(--ink);
  color: var(--white);
  border-radius: 14px;
  padding: 58px 54px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  flex-wrap: wrap;
  background-image: radial-gradient(600px 300px at 100% 0%, rgba(201, 123, 61, 0.18), transparent 65%);
}
.cta-band h2 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  max-width: 480px;
}
.cta-band p { color: var(--mist); margin-top: 8px; max-width: 480px; }

/* ---------- prose pages (about / privacy) ---------- */

.page-head {
  background: var(--ink);
  color: var(--white);
  padding: 76px 0 64px;
}
.page-head h1 {
  font-size: clamp(2rem, 4.5vw, 3rem);
  margin-top: 16px;
  max-width: 700px;
}
.page-head p {
  color: var(--mist);
  margin-top: 16px;
  max-width: 620px;
  font-size: 1.05rem;
}

.prose { max-width: 760px; }
.prose h2 {
  font-size: 1.45rem;
  margin: 44px 0 14px;
  font-weight: 500;
}
.prose h2:first-child { margin-top: 0; }
.prose p { color: var(--slate); margin-bottom: 16px; }
.prose ul { margin: 0 0 16px 22px; color: var(--slate); }
.prose li { margin-bottom: 8px; }
.prose .updated {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--mist);
  letter-spacing: 0.08em;
}

/* two-column about values */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: 40px;
}

/* ---------- contact ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
  align-items: start;
}

.contact-info h2 { font-size: 1.6rem; margin: 14px 0 14px; }
.contact-info p { color: var(--slate); margin-bottom: 26px; }

.info-item {
  display: flex;
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--line-light);
}
.info-item:last-child { border-bottom: 1px solid var(--line-light); }
.info-item .label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
  width: 90px;
  flex-shrink: 0;
  padding-top: 3px;
}
.info-item .value { font-size: 0.96rem; }
.info-item .value a { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--copper); }

.contact-form {
  background: var(--white);
  border: 1px solid var(--line-light);
  border-radius: 14px;
  padding: 38px;
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }

.field { margin-bottom: 18px; }
.field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 8px;
}
.field input,
.field select,
.field textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 0.96rem;
  padding: 13px 14px;
  border: 1px solid var(--line-light);
  border-radius: 7px;
  background: var(--porcelain);
  color: var(--ink);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.field textarea { resize: vertical; min-height: 130px; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--copper);
  box-shadow: 0 0 0 3px rgba(201, 123, 61, 0.18);
}

.form-note {
  font-size: 0.82rem;
  color: var(--mist);
  margin-top: 14px;
}

.form-success {
  display: none;
  background: rgba(46, 125, 50, 0.08);
  border: 1px solid rgba(46, 125, 50, 0.35);
  color: #2E7D32;
  border-radius: 7px;
  padding: 14px 16px;
  font-size: 0.92rem;
  margin-bottom: 18px;
}
.form-success.show { display: block; }

/* ---------- footer ---------- */

.site-footer {
  background: var(--ink);
  color: var(--mist);
  padding: 60px 0 34px;
  margin-top: 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 44px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line-dark);
}
.footer-grid .brand { margin-bottom: 14px; }
.footer-grid p { font-size: 0.9rem; max-width: 320px; }

.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--white);
  margin-bottom: 16px;
  font-weight: 500;
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a {
  color: var(--mist);
  text-decoration: none;
  font-size: 0.92rem;
  transition: color 0.15s ease;
}
.footer-col a:hover { color: var(--copper); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 26px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
}

/* ---------- responsive ---------- */

@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 48px; }
  .grid-4, .strip-grid { grid-template-columns: repeat(2, 1fr); }
  .process { grid-template-columns: repeat(2, 1fr); border-top: 0; }
  .step { border-left: 0; padding-left: 0; border-top: 1px solid var(--line-light); }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 680px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--ink);
    flex-direction: column;
    align-items: flex-start;
    padding: 20px 24px 26px;
    gap: 18px;
    border-bottom: 1px solid var(--line-dark);
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .grid-4, .grid-3, .strip-grid, .process, .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .cta-band { padding: 40px 28px; }
  section.block { padding: 64px 0; }
}

/* keyboard focus */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: 3px;
}