/* Stratum IT Solutions — site styles
   Design idea: every system is built in layers. Six "strata" colours (light → dark)
   map to the six service areas and are reused across the site. */

:root {
  --ink: #12212B;
  --ink-soft: #42545F;
  --paper: #F4F7F8;
  --white: #FFFFFF;
  --line: #D2DCDF;
  --amber: #D98E1F;
  --focus: #B36F00;

  --l1: #E4EDEF;
  --l2: #C6D8DC;
  --l3: #9DBFC6;
  --l4: #5E98A2;
  --l5: #2F6A75;
  --l6: #14313B;

  --font-display: 'Bricolage Grotesque', 'Segoe UI', system-ui, sans-serif;
  --font-body: 'Instrument Sans', 'Segoe UI', system-ui, sans-serif;
  --max: 1160px;
  --gutter: clamp(20px, 5vw, 48px);
}

/* Layer helpers: each sets a band colour and a readable ink colour */
.l1 { --band: var(--l1); --band-ink: var(--ink); }
.l2 { --band: var(--l2); --band-ink: var(--ink); }
.l3 { --band: var(--l3); --band-ink: var(--ink); }
.l4 { --band: var(--l4); --band-ink: var(--ink); }
.l5 { --band: var(--l5); --band-ink: #fff; }
.l6 { --band: var(--l6); --band-ink: #fff; }

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--white);
}
img, svg { max-width: 100%; display: block; }
a { color: var(--l5); text-underline-offset: 3px; }
a:hover { color: var(--ink); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 2px; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 0.5em;
}
h1 { font-size: clamp(2.3rem, 5.2vw, 4rem); }
h2 { font-size: clamp(1.7rem, 3.2vw, 2.4rem); }
h3 { font-size: 1.25rem; letter-spacing: -0.01em; }
p { margin: 0 0 1em; max-width: 68ch; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.skip {
  position: absolute; left: -999px; top: 8px; background: var(--ink); color: #fff;
  padding: 10px 16px; z-index: 100;
}
.skip:focus { left: 8px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font: 600 1rem/1 var(--font-body);
  padding: 15px 24px;
  border: 2px solid var(--ink);
  background: var(--ink);
  color: #fff;
  text-decoration: none;
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}
.btn:hover { background: var(--amber); border-color: var(--amber); color: var(--ink); }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--ink); border-color: var(--ink); color: #fff; }
.btn[disabled] { opacity: .6; cursor: progress; }
.on-dark .btn { background: #fff; border-color: #fff; color: var(--ink); }
.on-dark .btn:hover { background: var(--amber); border-color: var(--amber); }
.on-dark .btn-ghost { background: transparent; color: #fff; border-color: #fff; }
.on-dark .btn-ghost:hover { background: #fff; color: var(--ink); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(6px);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 92px; }
.brand { display: flex; align-items: center; gap: 16px; text-decoration: none; color: var(--ink); }
.brand-mark { width: 60px; height: 53px; flex: none; padding-right: 16px; box-sizing: content-box; border-right: 2px solid var(--line); }
.brand-name { font: 700 1.85rem/1 var(--font-display); letter-spacing: -0.03em; color: var(--l6); }
.brand-name small { display: block; font: 600 .82rem/1.2 var(--font-body); letter-spacing: .14em; text-transform: uppercase; color: var(--l5); margin-top: 6px; }

.nav-toggle {
  display: none; background: none; border: 2px solid var(--ink); color: var(--ink);
  font: 600 .95rem var(--font-body); padding: 8px 14px; cursor: pointer;
}
#site-nav ul { list-style: none; margin: 0; padding: 0; display: flex; align-items: center; gap: 4px; }
#site-nav a.nav-link {
  display: block; padding: 10px 14px; text-decoration: none; color: var(--ink);
  font-weight: 500; font-size: .98rem; border-bottom: 3px solid transparent;
}
#site-nav a.nav-link:hover { border-bottom-color: var(--l3); }
#site-nav a.nav-link[aria-current="page"] { border-bottom-color: var(--amber); }
#site-nav .nav-cta { margin-left: 10px; padding: 11px 20px; font-size: .95rem; }

.has-menu { position: relative; }
.submenu {
  position: absolute; left: 0; top: 100%; min-width: 280px;
  background: #fff; border: 1px solid var(--line); border-top: 3px solid var(--ink);
  padding: 6px 0 !important; display: none !important; flex-direction: column; align-items: stretch !important; gap: 0 !important;
  box-shadow: 0 12px 30px rgba(18,33,43,.12);
}
.has-menu:hover .submenu, .has-menu:focus-within .submenu { display: flex !important; }
.submenu a {
  display: flex; align-items: center; gap: 12px; padding: 10px 18px; text-decoration: none;
  color: var(--ink); font-size: .96rem;
}
.submenu a:hover { background: var(--paper); }
.swatch { width: 14px; height: 14px; background: var(--band); flex: none; border: 1px solid rgba(18,33,43,.25); }

/* ---------- Hero (home) ---------- */
.hero { padding: clamp(48px, 8vw, 96px) 0 clamp(56px, 8vw, 96px); background: var(--paper); }
.hero .wrap { display: grid; grid-template-columns: 1fr 1.05fr; gap: clamp(32px, 6vw, 80px); align-items: center; }
.hero h1 { max-width: 14ch; }
.hero .lead { font-size: 1.2rem; color: var(--ink-soft); max-width: 46ch; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 28px; }

/* The strata stack: the memorable element of the site */
.strata { list-style: none; margin: 0; padding: 0; }
.strata li {
  margin-top: -12px;
  background: var(--band);
  color: var(--band-ink);
  clip-path: polygon(0 12px, 100% 0, 100% calc(100% - 12px), 0 100%);
  animation: settle .7s cubic-bezier(.2,.7,.2,1) both;
}
.strata li:first-child { margin-top: 0; }
.strata li:nth-child(1) { animation-delay: .05s; }
.strata li:nth-child(2) { animation-delay: .15s; }
.strata li:nth-child(3) { animation-delay: .25s; }
.strata li:nth-child(4) { animation-delay: .35s; }
.strata li:nth-child(5) { animation-delay: .45s; }
.strata li:nth-child(6) { animation-delay: .55s; }
@keyframes settle { from { opacity: 0; transform: translateY(-18px); } to { opacity: 1; transform: none; } }

.strata a {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 30px 28px 26px; color: inherit; text-decoration: none; position: relative;
  transition: padding-left .2s;
}
.strata a::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 0; background: var(--amber);
  transition: width .2s;
}
.strata a:hover, .strata a:focus-visible { padding-left: 42px; color: inherit; }
.strata a:hover::before, .strata a:focus-visible::before { width: 10px; }
.strata a:focus-visible { outline-offset: -4px; outline-color: var(--amber); }
.s-name { font: 700 1.2rem/1.2 var(--font-display); letter-spacing: -0.01em; }
.s-desc { font-size: .92rem; opacity: .92; text-align: right; max-width: 22ch; line-height: 1.35; }

/* ---------- Generic sections ---------- */
.section { padding: clamp(56px, 8vw, 104px) 0; }
.section-tint { background: var(--paper); }
.section-head { max-width: 62ch; margin-bottom: 40px; }
.section-head p { color: var(--ink-soft); font-size: 1.1rem; }

/* Ruled list rows (used for capabilities, principles) */
.rows { list-style: none; padding: 0; margin: 0; border-top: 2px solid var(--ink); }
.rows li { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.4fr); gap: 12px 40px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.rows h3 { margin: 0; }
.rows p { margin: 0; color: var(--ink-soft); }

/* Steps: a real sequence, so numbered */
.steps { list-style: none; counter-reset: step; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
.steps li { counter-increment: step; padding: 24px 24px 24px 0; border-top: 2px solid var(--ink); position: relative; }
.steps li::before {
  content: counter(step); font: 700 1.1rem var(--font-display); display: inline-grid; place-items: center;
  width: 34px; height: 34px; background: var(--ink); color: #fff; margin-bottom: 14px;
}
.steps h3 { margin-bottom: .3em; }
.steps p { color: var(--ink-soft); font-size: .98rem; margin: 0; }

/* Two-column split */
.split { display: grid; grid-template-columns: 1.5fr 1fr; gap: clamp(32px, 6vw, 80px); align-items: start; }
.aside-block { border-left: 4px solid var(--band, var(--l4)); padding-left: 22px; margin-bottom: 36px; }
.aside-block h3 { margin-bottom: .6em; }
.aside-block ul { margin: 0; padding-left: 1.1em; color: var(--ink-soft); }
.aside-block ul.tags { padding-left: 0; }
.aside-block li { margin-bottom: .4em; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 0; }
.tags li { background: var(--paper); border: 1px solid var(--line); padding: 5px 12px; font-size: .92rem; }

/* ---------- Service page hero ---------- */
.page-hero {
  background: var(--band); color: var(--band-ink);
  padding: clamp(44px, 7vw, 88px) 0 clamp(64px, 9vw, 112px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), 0 100%);
}
.page-hero .crumb { font-size: .95rem; margin-bottom: 20px; }
.page-hero .crumb a { color: inherit; }
.page-hero h1 { max-width: 18ch; }
.page-hero .lead { font-size: 1.2rem; max-width: 56ch; margin: 0; }
.page-hero.plain { padding-bottom: clamp(56px, 8vw, 96px); }

/* ---------- Other layers (mini strata) ---------- */
.mini-strata { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; }
.mini-strata li { background: var(--band); color: var(--band-ink); border: 1px solid rgba(18,33,43,.08); }
.mini-strata a { display: block; padding: 22px 22px 24px; color: inherit; text-decoration: none; height: 100%; border-bottom: 5px solid transparent; }
.mini-strata a:hover { border-bottom-color: var(--amber); color: inherit; }
.mini-strata strong { font: 700 1.05rem var(--font-display); display: block; margin-bottom: 4px; }
.mini-strata span { font-size: .92rem; opacity: .92; display: block; line-height: 1.4; }

/* ---------- CTA band ---------- */
.cta { background: var(--l6); color: #fff; padding: clamp(48px, 7vw, 80px) 0; }
.cta .wrap { display: flex; justify-content: space-between; align-items: center; gap: 32px; flex-wrap: wrap; }
.cta h2 { margin: 0 0 .3em; }
.cta p { margin: 0; color: #C9DADD; max-width: 52ch; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: clamp(32px, 6vw, 80px); align-items: start; }
.field { margin-bottom: 20px; }
.field label { display: block; font-weight: 600; margin-bottom: 6px; font-size: .98rem; }
.field .opt { font-weight: 400; color: var(--ink-soft); }
.field input, .field select, .field textarea {
  width: 100%; font: inherit; color: var(--ink); background: #fff;
  border: 2px solid #9FB1B8; padding: 12px 14px; border-radius: 0; min-height: 50px;
}
.field textarea { min-height: 170px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: 3px solid var(--focus); outline-offset: 1px; border-color: var(--ink); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.hp { position: absolute !important; left: -9999px !important; height: 0; width: 0; overflow: hidden; }
.form-status { margin-top: 18px; padding: 14px 16px; border-left: 5px solid var(--ink); background: var(--paper); display: none; }
.form-status.show { display: block; }
.form-status.ok { border-color: #2E7D4F; background: #EAF5EE; }
.form-status.err { border-color: #B3372D; background: #FBECEA; }
.contact-side dl { margin: 0; }
.contact-side dt { font-weight: 600; margin-top: 18px; }
.contact-side dd { margin: 2px 0 0; color: var(--ink-soft); }

/* ---------- Footer ---------- */
.site-footer { background: var(--ink); color: #C9D6DB; padding: 56px 0 28px; font-size: .96rem; }
.site-footer a { color: #fff; text-decoration: none; }
.site-footer a:hover { text-decoration: underline; color: #fff; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; }
.site-footer h3 { font: 600 1rem var(--font-body); color: #fff; letter-spacing: 0; margin-bottom: .8em; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: .5em; }
.footer-brand { color: #fff; }
.footer-base { margin-top: 40px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.15); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; font-size: .88rem; }
.footer-strata { display: flex; height: 6px; margin-bottom: 0; }
.footer-strata span { flex: 1; background: var(--band); }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero .wrap, .split, .contact-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .mini-strata { grid-template-columns: repeat(2, 1fr); }
  .mini-strata li:last-child:nth-child(odd) { grid-column: 1 / -1; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero h1 { max-width: 18ch; }
}
@media (max-width: 860px) {
  .nav-toggle { display: block; }
  #site-nav { display: none; position: absolute; left: 0; right: 0; top: 92px; background: #fff; border-bottom: 1px solid var(--line); padding: 12px var(--gutter) 20px; }
  #site-nav.open { display: block; }
  #site-nav ul { flex-direction: column; align-items: stretch; gap: 0; }
  #site-nav .nav-cta { margin: 12px 0 0; text-align: center; }
  .submenu { position: static; display: flex !important; box-shadow: none; border: 0; border-left: 3px solid var(--line); margin: 0 0 8px 14px; min-width: 0; padding: 0 !important; }
}
@media (max-width: 640px) {
  .brand-mark { width: 44px; height: 39px; padding-right: 12px; }
  .brand-name { font-size: 1.5rem; }
  .brand-name small { font-size: .7rem; }
  .site-header .wrap { height: 80px; }
  #site-nav { top: 80px; }
  .rows li { grid-template-columns: 1fr; }
  .steps, .mini-strata, .field-row, .footer-grid { grid-template-columns: 1fr; }
  .s-desc { display: none; }
  .strata a { padding: 26px 22px 22px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .strata li { animation: none; }
  .strata a, .strata a::before, .btn { transition: none; }
}