/* ==========================================================================
   FIRST PRINCIPLES — Independent Technical Advisory for Manufacturing
   Design tokens: off-white paper ground, blueprint-blue accent,
   IBM Plex Sans / Plex Sans Condensed for a technical, drafted feel.
   ========================================================================== */

:root {
  --bg: #F5F4EF;
  --bg-panel: #FBFAF7;
  --ink: #17191B;
  --ink-muted: #5B5E60;
  --ink-faint: #8B8E8C;
  --accent: #1F3F5F;
  --accent-soft: #E8EDF0;
  --line: #D9D5CB;
  --line-strong: #BFBAAE;

  --content-width: 1120px;
  --gutter: clamp(24px, 5vw, 64px);
  --section-pad: clamp(64px, 10vw, 128px);

  --font-display: "IBM Plex Sans Condensed", "IBM Plex Sans", Arial, sans-serif;
  --font-body: "IBM Plex Sans", Arial, sans-serif;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--ink);
}

h1 { font-size: clamp(2.4rem, 5.6vw, 4.4rem); }
h2 { font-size: clamp(1.8rem, 3.4vw, 2.6rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); font-weight: 600; }

p { margin: 0 0 1.1em; }
p:last-child { margin-bottom: 0; }

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

.lede {
  font-size: clamp(1.1rem, 1.6vw, 1.35rem);
  color: var(--ink-muted);
  max-width: 62ch;
}

.body-copy {
  max-width: 62ch;
  color: var(--ink-muted);
}
.body-copy p { margin-bottom: 1.2em; }

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

.eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--accent);
  margin: 0 0 14px;
}

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

.section {
  padding: var(--section-pad) 0;
}
.section + .section {
  border-top: 1px solid var(--line);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: clamp(36px, 5vw, 56px);
}

/* ---------- Buttons & links ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 1rem;
  border: 1px solid var(--accent);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.btn:hover { background: #16304A; }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.btn-outline {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line-strong);
}
.btn-outline:hover { background: var(--bg-panel); border-color: var(--accent); }

.text-link {
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.text-link:hover { border-color: var(--accent); color: var(--accent); }

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ---------- Corner marks — a drafting-table motif, used sparingly ---------- */

.marked {
  position: relative;
}
.marked::before,
.marked::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 1.5px solid var(--accent);
  opacity: 0.55;
}
.marked::before {
  top: -1px; left: -1px;
  border-right: none; border-bottom: none;
}
.marked::after {
  bottom: -1px; right: -1px;
  border-left: none; border-top: none;
}

/* ---------- Nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(245, 244, 239, 0.92);
  backdrop-filter: saturate(140%) blur(6px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px var(--gutter);
  max-width: var(--content-width);
  margin: 0 auto;
}

.logo {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  color: var(--ink);
}
.logo span { color: var(--accent); }

.nav-links {
  display: flex;
  gap: clamp(18px, 3vw, 34px);
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.98rem;
}
.nav-links a {
  padding: 6px 0;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  border-bottom-color: var(--accent);
  color: var(--accent);
}

.nav-cta { display: none; }
@media (min-width: 640px) {
  .nav-cta { display: inline-flex; }
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line-strong);
  padding: 8px 10px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  cursor: pointer;
}

@media (max-width: 720px) {
  .nav-links { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-panel);
    border-bottom: 1px solid var(--line);
    padding: 12px var(--gutter) 22px;
    gap: 14px;
  }
}

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

.hero {
  position: relative;
  padding: clamp(72px, 12vw, 140px) 0 clamp(56px, 8vw, 96px);
  overflow: hidden;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  opacity: 0.5;
  mask-image: linear-gradient(to bottom, black, transparent 85%);
  -webkit-mask-image: linear-gradient(to bottom, black, transparent 85%);
}

.hero-inner {
  position: relative;
  max-width: 780px;
}

.hero h1 {
  margin: 10px 0 26px;
}

.hero .lede {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.2rem, 2.2vw, 1.6rem);
  color: var(--ink);
  margin-bottom: 22px;
}

.hero .desc {
  max-width: 56ch;
  color: var(--ink-muted);
  margin-bottom: 34px;
}

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

/* ---------- Stakes list (home) ---------- */

.stakes-list {
  list-style: none;
  margin: 34px 0;
  padding: 0;
  max-width: 640px;
}
.stakes-list li {
  padding: 16px 0;
  border-top: 1px solid var(--line);
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  font-weight: 500;
}
.stakes-list li:last-child { border-bottom: 1px solid var(--line); }

/* ---------- Grid layouts ---------- */

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}
@media (min-width: 800px) {
  .grid-2 { grid-template-columns: 1fr 1fr; gap: 64px; }
}

.grid-4 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
}
@media (min-width: 760px) {
  .grid-4 { grid-template-columns: 1fr 1fr; }
}
.grid-4 > div {
  padding: 36px clamp(0px, 2vw, 28px) 36px 0;
  border-bottom: 1px solid var(--line);
}
@media (min-width: 760px) {
  .grid-4 > div:nth-child(odd) { border-right: 1px solid var(--line); padding-right: 40px; }
  .grid-4 > div:nth-child(even) { padding-left: 40px; }
}

.cat-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  color: var(--ink-muted);
}
.cat-list li {
  padding: 7px 0;
  border-top: 1px dotted var(--line-strong);
}
.cat-list li:first-child { border-top: none; }

/* ---------- Full service sections (services page) ---------- */

.service-block {
  padding: var(--section-pad) 0;
}
.service-block + .service-block {
  border-top: 1px solid var(--line);
}
.service-block-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 34px;
}
@media (min-width: 760px) {
  .service-block-head { grid-template-columns: 1fr 1.4fr; align-items: start; gap: 48px; }
}
.service-items {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}
@media (min-width: 640px) {
  .service-items { grid-template-columns: 1fr 1fr; }
}
.service-items li {
  padding: 14px 20px 14px 0;
  border-top: 1px solid var(--line);
  font-size: 1rem;
}
.service-items li:nth-last-child(-n+2) { border-bottom: 1px solid var(--line); }

/* ---------- Cards / panels ---------- */

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  padding: clamp(28px, 4vw, 44px);
}

/* ---------- Steps (Experience — a genuine sequence) ---------- */

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
}
.step {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 20px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
}
.step:last-child { border-bottom: 1px solid var(--line); }
.step .step-num {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--accent);
}

/* ---------- Geography tags ---------- */

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}
.tag {
  border: 1px solid var(--line-strong);
  padding: 7px 16px;
  font-size: 0.92rem;
  color: var(--ink-muted);
}

/* ---------- CTA band ---------- */

.cta-band {
  background: var(--accent);
  color: #fff;
}
.cta-band h2, .cta-band p { color: #fff; }
.cta-band .lede { color: rgba(255,255,255,0.78); }
.cta-band .btn { background: #fff; color: var(--accent); border-color: #fff; }
.cta-band .btn:hover { background: var(--accent-soft); }
.cta-band .btn-outline { color: #fff; border-color: rgba(255,255,255,0.5); }
.cta-band .btn-outline:hover { background: rgba(255,255,255,0.08); border-color: #fff; }

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

.site-footer {
  border-top: 1px solid var(--line);
  padding: 56px 0 40px;
  color: var(--ink-muted);
  font-size: 0.95rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}
@media (min-width: 700px) {
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
}
.footer-nav {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}
.footer-nav li { margin-bottom: 8px; }
.footer-bottom {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--ink-faint);
}

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

.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
@media (min-width: 640px) {
  .form-grid.two { grid-template-columns: 1fr 1fr; }
}
label {
  display: block;
  font-size: 0.92rem;
  color: var(--ink-muted);
  margin-bottom: 6px;
}
input, textarea {
  width: 100%;
  background: var(--bg-panel);
  border: 1px solid var(--line-strong);
  padding: 12px 14px;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--ink);
}
input:focus, textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}
.field { margin-bottom: 4px; }
.form-note {
  font-size: 0.85rem;
  color: var(--ink-faint);
  margin-top: 10px;
}

.contact-details {
  list-style: none;
  margin: 0;
  padding: 0;
}
.contact-details li {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.contact-details li:last-child { border-bottom: 1px solid var(--line); }
.contact-details .k {
  display: block;
  font-size: 0.85rem;
  color: var(--ink-faint);
  margin-bottom: 4px;
}
.contact-details .v {
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.placeholder-note {
  display: inline-block;
  margin-top: 4px;
  font-size: 0.78rem;
  color: var(--accent);
  font-style: italic;
}

/* Spam-control field: kept in the DOM for bots, invisible to visitors. */
.honeypot {
  position: absolute !important;
  left: -10000px !important;
  width: 1px !important;
  height: 1px !important;
  overflow: hidden !important;
}