/* ===========================================================
   SAM Engineering Solutions Ltd
   Design language — engineering drawing / technical data sheet.
   Warm paper, ink, international orange. Hairline rules,
   condensed industrial display type, monospace annotations.
   =========================================================== */

:root {
  --paper: #f2f0ea;
  --paper-raised: #f7f5f0;
  --ink: #1a1c1e;
  --ink-soft: #43484d;
  --muted: #6b7076;
  --rule: #cfcabd;
  --rule-strong: #1a1c1e;
  --orange: #e8490c;
  --orange-deep: #c93c07;
  --plate: #141618;
  --plate-rule: rgba(242, 240, 234, 0.16);
  --plate-muted: #9aa0a6;

  --maxw: 1200px;
  --gutter: clamp(20px, 5vw, 48px);

  --font-display: "Barlow Condensed", "Arial Narrow", sans-serif;
  --font-body: "Archivo", "Helvetica Neue", sans-serif;
  --font-mono: "IBM Plex Mono", "Courier New", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

::selection { background: var(--orange); color: var(--paper); }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

h1, h2, h3 { margin: 0; }
a { color: inherit; text-decoration: none; }
p { margin: 0; }

/* ---------- Utility type ---------- */

.mono {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 10px 16px;
  z-index: 200;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- Reveal-on-scroll ---------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation: none !important; }
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 15px 26px;
  border: 1px solid var(--ink);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  cursor: pointer;
}
.btn::after { content: "→"; font-family: var(--font-body); transition: transform 0.2s ease; }
.btn:hover::after { transform: translateX(4px); }

.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--orange); border-color: var(--orange); color: #fff; }

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

.btn-ghost-dark { background: transparent; color: var(--paper); border-color: rgba(242, 240, 234, 0.4); }
.btn-ghost-dark:hover { border-color: var(--orange); color: var(--orange); }

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(242, 240, 234, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule-strong);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  line-height: 1;
}
.brand:hover .brand-mark { background: var(--orange); }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-menu a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.nav-menu a:hover { color: var(--orange); border-color: var(--orange); }
.nav-cta {
  border: 1px solid var(--ink) !important;
  padding: 9px 16px !important;
  color: var(--ink) !important;
  transition: background 0.2s ease, color 0.2s ease !important;
}
.nav-cta:hover { background: var(--ink); color: var(--paper) !important; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 40px;
  height: 40px;
  background: none;
  border: 1px solid var(--ink);
  cursor: pointer;
  padding: 0 8px;
}
.nav-toggle span {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--ink);
  transition: transform 0.25s ease, opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero — drawing sheet ---------- */

.hero {
  position: relative;
  border-bottom: 1px solid var(--rule-strong);
  /* faint graph-paper grid */
  background-image:
    linear-gradient(var(--rule) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule) 1px, transparent 1px);
  background-size: 88px 88px;
  background-position: center top;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(242, 240, 234, 0.6), var(--paper) 85%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  padding-top: clamp(48px, 8vw, 96px);
  padding-bottom: 0;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 32px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule);
  padding: 10px 0;
  margin-bottom: clamp(40px, 7vw, 88px);
}
.hero-meta .meta-accent { color: var(--orange); }

.hero-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(3.4rem, 10vw, 8.2rem);
  line-height: 0.95;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  max-width: 14ch;
}
.hero-title .accent {
  color: var(--orange);
  display: inline-block;
}

.hero-lead {
  margin: clamp(28px, 4vw, 40px) 0 0;
  max-width: 56ch;
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  color: var(--ink-soft);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: clamp(32px, 5vw, 48px) 0 clamp(48px, 7vw, 80px);
}

/* Stats strip — spec table */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 0;
  border-top: 1px solid var(--rule-strong);
}
.hero-stats > div {
  padding: 24px clamp(16px, 3vw, 32px) 28px 0;
}
.hero-stats > div + div {
  border-left: 1px solid var(--rule);
  padding-left: clamp(16px, 3vw, 32px);
}
.hero-stats dt {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  line-height: 1;
  text-transform: uppercase;
}
.hero-stats dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  max-width: 22ch;
}

/* ---------- Trust strip ---------- */

.trust {
  border-bottom: 1px solid var(--rule-strong);
  padding: 22px 0;
}
.trust .container {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px 40px;
}
.trust-label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
  white-space: nowrap;
}
.trust-logos {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 40px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.trust-logos li {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

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

.section { padding: clamp(72px, 10vw, 128px) 0; }
.section + .section { border-top: 1px solid var(--rule-strong); }

.section-head { margin-bottom: clamp(40px, 6vw, 64px); }
.section-index {
  display: flex;
  align-items: baseline;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 22px;
}
.section-index::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--rule);
  align-self: center;
}
.section-head h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  line-height: 1;
  letter-spacing: -0.005em;
  text-transform: uppercase;
  max-width: 22ch;
}
.section-intro {
  margin: 20px 0 0;
  color: var(--ink-soft);
  font-size: 1.05rem;
  max-width: 58ch;
}

/* ---------- Services — numbered index rows ---------- */

.service-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule-strong);
  counter-reset: svc;
}
.service-list li {
  counter-increment: svc;
  display: grid;
  grid-template-columns: 72px minmax(220px, 0.85fr) 1.4fr;
  gap: 12px clamp(20px, 4vw, 56px);
  align-items: baseline;
  padding: clamp(24px, 3vw, 34px) clamp(8px, 1.5vw, 20px);
  border-bottom: 1px solid var(--rule);
  position: relative;
  transition: background 0.25s ease;
}
.service-list li::before {
  content: "0" counter(svc);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  transition: color 0.25s ease;
}
.service-list li::after {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  bottom: 0;
  width: 2px;
  background: var(--orange);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}
.service-list li:hover { background: var(--paper-raised); }
.service-list li:hover::before { color: var(--orange); }
.service-list li:hover::after { transform: scaleY(1); }
.service-list h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.35rem, 2.4vw, 1.8rem);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  line-height: 1.05;
}
.service-list p { color: var(--ink-soft); font-size: 0.98rem; }

/* ---------- Sectors — quadrant grid ---------- */

.sector-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--rule-strong);
}
.sector {
  padding: clamp(28px, 4vw, 44px);
  position: relative;
}
.sector:nth-child(2n) { border-left: 1px solid var(--rule); }
.sector:nth-child(n + 3) { border-top: 1px solid var(--rule); }
.sector-tag {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  color: var(--orange);
  display: block;
  margin-bottom: 14px;
}
.sector h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.4rem, 2.4vw, 1.85rem);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin-bottom: 12px;
  line-height: 1.05;
}
.sector p { color: var(--ink-soft); font-size: 0.98rem; }

/* ---------- Experience — service record ---------- */

.record {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule-strong);
}
.record li {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 8px clamp(24px, 4vw, 64px);
  padding: clamp(24px, 3vw, 32px) 0;
  border-bottom: 1px solid var(--rule);
}
.rec-date {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--orange);
  padding-top: 6px;
}
.rec-body h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.3rem, 2.2vw, 1.7rem);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  line-height: 1.1;
  margin-bottom: 8px;
}
.rec-body h3 .rec-co { color: var(--muted); }
.rec-body p { color: var(--ink-soft); font-size: 0.98rem; max-width: 68ch; }

/* ---------- Approach — dark plate ---------- */

.section-plate {
  background: var(--plate);
  color: var(--paper);
  border-top: 1px solid var(--rule-strong);
}
.section-plate .section-index { color: var(--orange); }
.section-plate .section-index::after { background: var(--plate-rule); }

.approach-inner {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: clamp(40px, 7vw, 96px);
  align-items: start;
}
.approach-text h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2rem, 4.2vw, 3.2rem);
  line-height: 1.02;
  text-transform: uppercase;
}
.approach-text > p {
  margin: 22px 0 0;
  color: var(--plate-muted);
  font-size: 1.05rem;
  max-width: 50ch;
}

.approach-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: app;
  border-top: 1px solid var(--plate-rule);
}
.approach-list li {
  counter-increment: app;
  position: relative;
  padding: 20px 0 20px 56px;
  border-bottom: 1px solid var(--plate-rule);
  color: var(--plate-muted);
  font-size: 0.98rem;
}
.approach-list li::before {
  content: "0" counter(app);
  position: absolute;
  left: 0;
  top: 22px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--orange);
}
.approach-list strong {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--paper);
  margin-bottom: 4px;
}

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

.contact { position: relative; }
.contact h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.8rem, 8vw, 6.4rem);
  line-height: 0.96;
  text-transform: uppercase;
  max-width: 14ch;
}
.contact h2 .accent { color: var(--orange); }
.contact-lead {
  margin: 26px 0 0;
  color: var(--ink-soft);
  font-size: 1.08rem;
  max-width: 52ch;
}
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(32px, 5vw, 44px);
}
.contact-fineprint {
  margin-top: clamp(36px, 5vw, 52px);
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- Footer — drawing title block ---------- */

.site-footer {
  background: var(--plate);
  color: var(--plate-muted);
  border-top: 2px solid var(--ink);
}
.title-block {
  display: grid;
  grid-template-columns: 2fr 1.4fr 1.4fr 1fr;
  border-left: 1px solid var(--plate-rule);
  border-right: 1px solid var(--plate-rule);
}
.tb-cell {
  padding: 18px 20px 20px;
  border-right: 1px solid var(--plate-rule);
  border-bottom: 1px solid var(--plate-rule);
}
.tb-cell:last-child { border-right: 0; }
.tb-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 6px;
}
.tb-value {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.02rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--paper);
}
.tb-value a:hover { color: var(--orange); }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding: 16px 0 20px;
}
.footer-nav { display: flex; flex-wrap: wrap; gap: 20px; }
.footer-nav a {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transition: color 0.2s ease;
}
.footer-nav a:hover { color: var(--orange); }
.footer-legal {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.site-footer .container { padding-top: clamp(28px, 4vw, 40px); }

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

@media (max-width: 880px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--rule-strong);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }
  .nav-menu.open { max-height: 420px; }
  .nav-menu li { padding: 0 var(--gutter); }
  .nav-menu a { display: block; padding: 16px 0; border-bottom: 1px solid var(--rule); }
  .nav-cta { border: 0 !important; padding: 16px 0 !important; }
  .nav-cta:hover { background: none; color: var(--orange) !important; }

  .service-list li { grid-template-columns: 48px 1fr; }
  .service-list li p { grid-column: 2; }

  .sector-grid { grid-template-columns: 1fr; }
  .sector:nth-child(2n) { border-left: 0; }
  .sector:nth-child(n + 2) { border-top: 1px solid var(--rule); }

  .record li { grid-template-columns: 1fr; }
  .rec-date { padding-top: 0; }

  .approach-inner { grid-template-columns: 1fr; }

  .title-block { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 560px) {
  .hero-stats { grid-template-columns: 1fr; }
  .hero-stats > div + div {
    border-left: 0;
    border-top: 1px solid var(--rule);
    padding-left: 0;
  }
  .title-block { grid-template-columns: 1fr; }
  .tb-cell { border-right: 0; }
}