/* =========================================================
   CP Development — static homepage styles
   Corporate B2B · senior engineering positioning
   Dark palette + off-white body · teal accent · serif hero
   ========================================================= */

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: #1a1d23;
  background: #FAFAF9;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: #0D9488; text-decoration: none; }
a:hover { color: #0B7A6E; }
ul, ol { padding: 0; margin: 0; list-style: none; }
h1, h2, h3, h4, h5 { margin: 0; line-height: 1.2; font-weight: 600; }
p { margin: 0 0 1em; }
button { font: inherit; cursor: pointer; }

/* ---------- Tokens ---------- */
:root {
  --ink: #0A0F1E;
  --ink-2: #1a1d23;
  --gray-900: #111827;
  --gray-700: #374151;
  --gray-600: #4b5563;
  --gray-500: #6b7280;
  --gray-400: #9ca3af;
  --gray-300: #d1d5db;
  --gray-200: #e5e7eb;
  --gray-100: #f3f4f6;
  --off-white: #FAFAF9;
  --paper: #ffffff;
  --accent: #0D9488;
  --accent-dark: #0B7A6E;
  --accent-light: #14B8A6;
  --border: #e7e5e4;

  --serif: "Instrument Serif", "IBM Plex Serif", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", "SF Mono", Menlo, Consolas, monospace;

  --container: 1180px;
  --radius: 4px;
}

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: 64px 0; }
.section-alt { background: var(--paper); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: #fff; padding: 12px 16px;
}
.skip-link:focus { left: 16px; top: 16px; z-index: 1000; }

/* ---------- Typography helpers ---------- */
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 16px;
  font-weight: 500;
}
.eyebrow-muted { color: var(--gray-500); }
.accent { color: var(--accent); }
.lede { color: var(--gray-600); font-size: 19px; max-width: 720px; }

.section-header { margin-bottom: 40px; max-width: 760px; }
.section-header h2 {
  font-family: var(--serif);
  font-size: clamp(32px, 4vw, 46px);
  font-weight: 400;
  line-height: 1.1;
  color: var(--ink);
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-weight: 500;
  font-size: 15px;
  line-height: 1.2;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease, transform 120ms ease;
  white-space: nowrap;
  text-decoration: none;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); color: #fff; }
.btn-secondary { background: transparent; color: var(--ink); border-color: var(--gray-300); }
.btn-secondary:hover { border-color: var(--ink); color: var(--ink); }
.btn-sm { padding: 9px 16px; font-size: 14px; }
.btn-lg { padding: 16px 28px; font-size: 16px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 249, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding-top: 18px;
  padding-bottom: 18px;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: -0.01em;
}
.logo:hover { color: var(--ink); }
.logo-img { height: 52px; width: auto; display: block; }
.logo-img-footer { height: 34px; filter: brightness(0) invert(1); }
.logo-mark {
  display: inline-grid;
  place-items: center;
  width: 32px; height: 32px;
  background: var(--ink);
  color: #fff;
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0;
}
.logo-word { font-size: 16px; }
.site-nav {
  display: flex;
  gap: 28px;
  margin-left: auto;
  margin-right: 24px;
}
.site-nav a {
  color: var(--gray-700);
  font-size: 15px;
  font-weight: 500;
}
.site-nav a:hover { color: var(--ink); }
.menu-toggle {
  display: none;
  background: none;
  border: 0;
  width: 40px;
  height: 40px;
  padding: 8px;
}
.menu-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--ink);
  margin: 5px 0;
  border-radius: 2px;
}

/* ---------- Hero ---------- */
.hero {
  padding: 56px 0 40px;
  background:
    radial-gradient(1200px 400px at 10% -10%, rgba(13, 148, 136, 0.06), transparent 60%),
    radial-gradient(1000px 400px at 90% 0%, rgba(13, 148, 136, 0.04), transparent 60%);
  border-bottom: 1px solid var(--border);
}
.hero-title {
  font-family: var(--serif);
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin: 0 0 28px;
  max-width: 980px;
}
.hero-sub {
  font-size: 20px;
  line-height: 1.55;
  color: var(--gray-600);
  max-width: 760px;
  margin: 0 0 36px;
}
.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  max-width: 860px;
}
.hero-meta li {
  font-size: 14px;
  color: var(--gray-600);
  font-family: var(--mono);
}
.hero-meta strong {
  display: block;
  font-size: 22px;
  color: var(--ink);
  font-family: var(--serif);
  font-weight: 400;
  margin-bottom: 2px;
}

/* ---------- Trusted by strip ---------- */
.trusted {
  padding: 32px 0;
  background: var(--paper);
  border-bottom: 1px solid var(--border);
}
.trusted .eyebrow { margin-bottom: 16px; }
.client-list {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
  align-items: center;
}
.client-list li {
  font-family: var(--serif);
  font-size: 20px;
  color: var(--gray-700);
  padding-right: 28px;
  border-right: 1px solid var(--border);
  line-height: 1;
}
.client-list li:last-child { border-right: 0; padding-right: 0; }

/* ---------- Pillars ---------- */
.pillar-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.pillar {
  background: var(--off-white);
  padding: 40px 36px;
  position: relative;
  display: flex;
  flex-direction: column;
}
.pillar-num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  margin-bottom: 20px;
  letter-spacing: 0.06em;
}
.pillar h3 {
  font-family: var(--serif);
  font-size: 26px;
  font-weight: 400;
  line-height: 1.2;
  color: var(--ink);
  margin-bottom: 14px;
}
.pillar > p {
  color: var(--gray-600);
  font-size: 16px;
  margin: 0 0 22px;
}
.pillar-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 24px;
}
.pillar-stack li {
  font-family: var(--mono);
  font-size: 11px;
  padding: 4px 10px;
  background: var(--paper);
  border: 1px solid var(--border);
  color: var(--gray-700);
  border-radius: 3px;
}
.pillar-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  margin-top: auto;
  font-family: var(--mono);
  letter-spacing: 0.02em;
}
.pillar-link:hover { color: var(--accent-dark); }

/* ---------- Use cases ---------- */
.use-case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.use-case {
  padding: 28px;
  background: var(--off-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 160ms ease, transform 160ms ease;
}
.use-case:hover { border-color: var(--gray-400); }
.uc-vertical {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 14px;
  font-weight: 500;
}
.use-case h4 {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 400;
  line-height: 1.25;
  color: var(--ink);
  margin-bottom: 10px;
}
.use-case p {
  color: var(--gray-600);
  font-size: 15px;
  margin: 0;
  line-height: 1.55;
}

/* ---------- Approach ---------- */
.approach { background: var(--off-white); }
.approach-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}
.approach-item h4 {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 12px;
  padding-top: 16px;
  border-top: 2px solid var(--ink);
  display: inline-block;
}
.approach-item p {
  color: var(--gray-600);
  font-size: 15px;
  margin: 0;
}

/* ---------- Numbers strip ---------- */
.numbers {
  background: var(--ink);
  color: #fff;
  padding: 56px 0;
}
.numbers ul {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 32px;
  text-align: left;
}
.numbers li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 20px;
  border-left: 2px solid var(--accent);
}
.n-big {
  font-family: var(--serif);
  font-size: 34px;
  font-weight: 400;
  line-height: 1;
  color: #fff;
}
.n-label {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--gray-400);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ---------- CTA strip ---------- */
.cta-strip {
  padding: 64px 0;
  background: var(--off-white);
  border-top: 1px solid var(--border);
}
.cta-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 40px;
  padding: 48px 48px;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.cta-inner h2 {
  font-family: var(--serif);
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 400;
  color: var(--ink);
  line-height: 1.2;
  margin-bottom: 10px;
  max-width: 640px;
}
.cta-inner p {
  color: var(--gray-600);
  font-size: 16px;
  margin: 0;
  max-width: 640px;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: var(--gray-400);
  padding: 72px 0 32px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 64px;
  margin-bottom: 56px;
}
.logo-footer { color: #fff; }
.logo-footer:hover { color: #fff; }
.footer-tag {
  color: var(--gray-400);
  font-size: 14px;
  margin: 18px 0 0;
  max-width: 320px;
  line-height: 1.5;
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}
.footer-cols h5 {
  font-size: 12px;
  font-family: var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #fff;
  margin-bottom: 18px;
  font-weight: 500;
}
.footer-cols ul { display: flex; flex-direction: column; gap: 10px; }
.footer-cols a { color: var(--gray-400); font-size: 14px; }
.footer-cols a:hover { color: #fff; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.08);
  color: var(--gray-500);
  font-size: 13px;
  font-family: var(--mono);
}
.footer-bottom p { margin: 0; }
.footer-bottom a { color: var(--gray-400); }
.footer-bottom a:hover { color: #fff; }

/* ---------- Interior page hero ---------- */
.page-hero {
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--border);
}
.page-hero h1 {
  font-family: var(--serif);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin: 0 0 18px;
  max-width: 820px;
}
.page-hero .lede {
  font-size: 19px;
  color: var(--gray-600);
  max-width: 680px;
  margin: 0;
}
.page-hero .eyebrow { margin-bottom: 14px; }

/* ---------- Prose (about, blog posts, privacy) ---------- */
.prose { max-width: 720px; }
.prose h2 {
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 400;
  color: var(--ink);
  margin: 48px 0 16px;
  line-height: 1.2;
}
.prose h2:first-child { margin-top: 0; }
.prose h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
  margin: 32px 0 10px;
}
.prose p { color: var(--gray-600); margin: 0 0 16px; line-height: 1.65; }
.prose ul, .prose ol {
  color: var(--gray-600);
  padding-left: 24px;
  margin: 0 0 16px;
  list-style: disc;
}
.prose ol { list-style: decimal; }
.prose li { margin-bottom: 6px; line-height: 1.6; }
.prose blockquote {
  border-left: 3px solid var(--accent);
  padding: 16px 24px;
  margin: 24px 0;
  background: var(--gray-100);
  border-radius: 0 4px 4px 0;
}
.prose blockquote p { margin: 0; color: var(--gray-700); font-style: italic; }
.prose blockquote cite {
  display: block;
  margin-top: 10px;
  font-style: normal;
  font-size: 14px;
  color: var(--gray-500);
  font-family: var(--mono);
}
.prose code {
  font-family: var(--mono);
  font-size: 14px;
  background: var(--gray-100);
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--gray-700);
}
.prose pre {
  background: var(--ink);
  color: #e5e7eb;
  padding: 20px 24px;
  border-radius: 6px;
  overflow-x: auto;
  margin: 24px 0;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.6;
}
.prose pre code { background: none; padding: 0; color: inherit; }
.prose a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.prose a:hover { color: var(--accent-dark); }

/* ---------- Service detail pages ---------- */
.service-body { padding: 64px 0; }
.service-content {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 64px;
  align-items: start;
}
.service-main { max-width: 680px; }
.service-main h2 {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 400;
  color: var(--ink);
  margin: 0 0 16px;
  line-height: 1.2;
}
.service-main h2 + p { color: var(--gray-600); line-height: 1.6; }
.service-main p { color: var(--gray-600); line-height: 1.6; margin: 0 0 16px; }
.service-main ul {
  color: var(--gray-600);
  padding-left: 20px;
  margin: 0 0 20px;
  list-style: disc;
}
.service-main li { margin-bottom: 6px; line-height: 1.55; }
.service-block { margin-bottom: 48px; }
.service-block:last-child { margin-bottom: 0; }
.service-sidebar {
  position: sticky;
  top: 80px;
  padding: 28px;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.service-sidebar h4 {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-500);
  margin: 0 0 14px;
}
.service-sidebar ul {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 24px;
}
.service-sidebar li {
  font-family: var(--mono);
  font-size: 12px;
  padding: 5px 10px;
  background: var(--off-white);
  border: 1px solid var(--border);
  color: var(--gray-700);
  border-radius: 3px;
}
.service-sidebar .btn { width: 100%; margin-top: 8px; }

/* ---------- Work / portfolio grid ---------- */
.work-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.work-card {
  padding: 32px;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: border-color 160ms ease;
  display: flex;
  flex-direction: column;
}
.work-card:hover { border-color: var(--gray-400); }
.work-card .uc-vertical { margin-bottom: 10px; }
.work-card h3 {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 8px;
  line-height: 1.25;
}
.work-card .work-meta {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--gray-500);
  margin-bottom: 14px;
}
.work-card p { color: var(--gray-600); font-size: 15px; line-height: 1.55; margin: 0 0 18px; }
.work-card .pillar-stack { margin-top: auto; }

/* ---------- Blog index ---------- */
.blog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}
.blog-entry {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: baseline;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}
.blog-entry:first-child { border-top: 1px solid var(--border); }
.blog-entry h3 {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 400;
  color: var(--ink);
  line-height: 1.3;
  margin: 0 0 6px;
}
.blog-entry h3 a { color: var(--ink); }
.blog-entry h3 a:hover { color: var(--accent); }
.blog-entry p { color: var(--gray-600); font-size: 15px; margin: 0; line-height: 1.5; }
.blog-date {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--gray-400);
  white-space: nowrap;
}
.blog-post-meta {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--gray-400);
  margin: 0 0 32px;
}

/* ---------- Contact form ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 64px;
  align-items: start;
}
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 6px;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 11px 14px;
  font: inherit;
  font-size: 15px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
  transition: border-color 120ms ease;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.12);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact-aside h4 {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-500);
  margin: 0 0 12px;
}
.contact-aside p {
  color: var(--gray-600);
  font-size: 15px;
  margin: 0 0 28px;
  line-height: 1.55;
}
.contact-aside a { color: var(--accent); }

/* ---------- Active nav marker ---------- */
.site-nav a.active { color: var(--ink); }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .pillar-grid { grid-template-columns: 1fr; }
  .use-case-grid { grid-template-columns: repeat(2, 1fr); }
  .approach-grid { grid-template-columns: repeat(2, 1fr); }
  .numbers ul { grid-template-columns: repeat(3, 1fr); row-gap: 32px; }
  .footer-inner { grid-template-columns: 1fr; gap: 48px; }
  .service-content { grid-template-columns: 1fr; }
  .service-sidebar { position: static; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .section { padding: 48px 0; }
  .hero { padding: 48px 0 40px; }
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--off-white);
    flex-direction: column;
    gap: 0;
    padding: 12px 24px 20px;
    border-bottom: 1px solid var(--border);
    margin: 0;
  }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 14px 0; border-bottom: 1px solid var(--border); }
  .site-nav a:last-child { border-bottom: 0; }
  .header-inner .btn { display: none; }
  .menu-toggle { display: block; margin-left: auto; }
  .header-inner { gap: 16px; }

  .hero-meta { gap: 24px 32px; }
  .client-list { gap: 12px 20px; }
  .client-list li { padding-right: 20px; font-size: 18px; }

  .use-case-grid { grid-template-columns: 1fr; }
  .approach-grid { grid-template-columns: 1fr; gap: 32px; }
  .numbers { padding: 40px 0; }
  .numbers ul { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  .n-big { font-size: 28px; }

  .cta-inner { flex-direction: column; align-items: flex-start; padding: 32px 28px; }
  .footer-cols { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; }
  .work-grid { grid-template-columns: 1fr; }
  .blog-entry { grid-template-columns: 1fr; gap: 8px; }
  .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero-cta { flex-direction: column; align-items: stretch; }
  .hero-cta .btn { width: 100%; }
  .footer-cols { grid-template-columns: 1fr; }
}

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