/* ==========================================================================
   ISOROCK — Brand design system
   Palette and typography from Bzoing visual identity (March 2026).
   PP Neue Corp Compact (paid) → Saira Condensed 900 as web analog.
   PP Mori (paid) → Manrope as web analog.
   ========================================================================== */

:root {
  /* Mineral palette — Bzoing identity, March 2026.
     Brand book defines exactly six colours. White is auxiliary,
     used only inside form inputs where contrast is required. */
  --c-basalte:    #212121;
  --c-beige:      #d1bf9e;
  --c-brun:       #a38763;
  --c-gris:       #878787;
  --c-brun-fonce: #38260f;
  --c-os:         #e5e5d9;
  --c-white:      #ffffff; /* aux — forms only */

  /* Semantic — derived strictly from the palette
     (alt is a tone-on-tone deepening of OS, not white). */
  --bg:           var(--c-os);
  --bg-alt:       #d8d2bd;
  --bg-beige:     var(--c-beige);
  --bg-dark:      var(--c-basalte);
  --bg-brun-fonce: var(--c-brun-fonce);
  --ink:          var(--c-basalte);
  --ink-muted:    rgba(33, 33, 33, 0.62);
  --ink-on-dark:  var(--c-os);
  --ink-on-beige: var(--c-brun-fonce);
  --rule:         rgba(33, 33, 33, 0.14);
  --rule-on-dark: rgba(229, 229, 217, 0.18);
  --rule-on-beige: rgba(56, 38, 15, 0.22);
  --accent:       var(--c-brun);

  /* Type */
  --ff-display: "Saira Condensed", "Arial Narrow", sans-serif;
  --ff-body:    "Manrope", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --fs-eyebrow: 0.75rem;
  --fs-body:    1rem;
  --fs-lede:    1.25rem;
  --fs-h3:      clamp(1.5rem, 1.2rem + 1vw, 2rem);
  --fs-h2:      clamp(2rem, 1.6rem + 2vw, 3.25rem);
  --fs-h1:      clamp(3rem, 2rem + 5vw, 6.5rem);
  --fs-display: clamp(4rem, 2rem + 9vw, 10rem);

  --tracking-tight: -0.02em;
  --tracking-eyebrow: 0.18em;

  /* Layout */
  --maxw: 1280px;
  --gutter: clamp(1.25rem, 2vw, 2.5rem);
  --section-pad: clamp(4rem, 8vw, 8rem);
}

/* Reset --------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--ff-body);
  font-size: var(--fs-body);
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

/* Type ---------------------------------------------------------------------- */
h1, h2, h3, h4 {
  font-family: var(--ff-display);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: var(--tracking-tight);
  text-transform: uppercase;
  margin: 0;
}
h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
h4 { font-size: 1.125rem; letter-spacing: 0; }

p { margin: 0 0 1em; }
.lede { font-size: var(--fs-lede); line-height: 1.4; max-width: 60ch; color: var(--ink-muted); }

.eyebrow {
  font-family: var(--ff-body);
  font-size: var(--fs-eyebrow);
  font-weight: 600;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--ink-muted);
  display: inline-block;
}

/* Layout primitives --------------------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-inline: var(--gutter);
}
.section { padding-block: var(--section-pad); }
.section--dark   { background: var(--bg-dark);   color: var(--ink-on-dark); }
.section--alt    { background: var(--bg-alt); }
.section--beige  { background: var(--bg-beige);  color: var(--ink-on-beige); }
.section--dark .lede,
.section--dark .eyebrow { color: rgba(229, 229, 217, 0.7); }
.section--dark .rule    { border-color: var(--rule-on-dark); }
.section--beige .lede,
.section--beige .eyebrow { color: rgba(56, 38, 15, 0.72); }
.section--beige .section-head h2,
.section--beige h2 { color: var(--c-brun-fonce); }

.rule { border: 0; border-top: 1px solid var(--rule); margin: 0; }

.grid { display: grid; gap: clamp(1rem, 2vw, 2.5rem); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

/* Buttons ------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.95rem 1.4rem;
  border: 1px solid currentColor;
  background: var(--c-basalte);
  color: var(--c-os);
  font-family: var(--ff-body);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
.btn:hover { background: var(--c-brun-fonce); transform: translateY(-1px); }
.btn--ghost { background: transparent; color: inherit; }
.btn--ghost:hover { background: var(--c-basalte); color: var(--c-os); transform: translateY(-1px); }
.btn .arrow { transition: transform 0.2s ease; }
.btn:hover .arrow { transform: translateX(4px); }

/* Header -------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--rule);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1rem;
}
.brand {
  display: inline-flex;
  align-items: center;
}
.brand img { height: 28px; width: auto; }
.nav {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2vw, 2rem);
}
.nav a {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink);
  position: relative;
  padding-block: 0.25rem;
}
.nav a::after {
  content: "";
  position: absolute;
  inset: auto 0 -2px 0;
  height: 2px;
  background: var(--c-basalte);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}
.nav a:hover::after,
.nav a[aria-current="page"]::after { transform: scaleX(1); }

.lang-switch {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: inline-flex;
  gap: 0.4rem;
}
.lang-switch a { opacity: 0.5; }
.lang-switch a[aria-current="true"] { opacity: 1; }
.lang-switch span { opacity: 0.3; }

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--ink);
  padding: 0.45rem 0.75rem;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
@media (max-width: 820px) {
  .nav-toggle { display: inline-flex; }
  .nav {
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--rule);
    padding: 0.5rem var(--gutter) 1.25rem;
    display: none;
  }
  .nav a { padding-block: 0.85rem; border-top: 1px solid var(--rule); }
  .nav.is-open { display: flex; }
}

/* Hero ---------------------------------------------------------------------- */
.hero {
  background: var(--c-basalte);
  color: var(--c-os);
  padding-block: clamp(5rem, 12vw, 10rem);
  position: relative;
  overflow: hidden;
}
.hero__inner { position: relative; z-index: 2; }
.hero__eyebrow { color: rgba(229, 229, 217, 0.65); margin-bottom: 1.5rem; }
.hero h1 {
  font-size: var(--fs-display);
  margin-bottom: 1.5rem;
  max-width: 14ch;
}
.hero__lede {
  max-width: 56ch;
  font-size: clamp(1.05rem, 0.9rem + 0.5vw, 1.35rem);
  color: rgba(229, 229, 217, 0.82);
  margin-bottom: 2.5rem;
}
.hero__cta { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.hero__cta .btn { background: var(--c-os); color: var(--c-basalte); border-color: var(--c-os); }
.hero__cta .btn:hover { background: var(--c-beige); border-color: var(--c-beige); }
.hero__cta .btn--ghost { background: transparent; color: var(--c-os); border-color: rgba(229, 229, 217, 0.4); }
.hero__cta .btn--ghost:hover { background: var(--c-os); color: var(--c-basalte); border-color: var(--c-os); }

.hero__meta {
  margin-top: clamp(3rem, 6vw, 5rem);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem 2rem;
  border-top: 1px solid rgba(229, 229, 217, 0.18);
  padding-top: 2rem;
}
.hero__meta dt {
  font-size: var(--fs-eyebrow);
  font-weight: 600;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: rgba(229, 229, 217, 0.55);
  margin-bottom: 0.4rem;
}
.hero__meta dd {
  font-family: var(--ff-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 1.2rem + 1vw, 2rem);
  line-height: 1;
  letter-spacing: var(--tracking-tight);
  text-transform: uppercase;
  margin: 0;
}

/* Section heading ----------------------------------------------------------- */
.section-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}
@media (min-width: 820px) {
  .section-head { grid-template-columns: 1fr 1fr; gap: 3rem; }
}
.section-head h2 { max-width: 14ch; }
.section-head__body { padding-top: 0.5rem; }

/* Pillars (value props) ----------------------------------------------------- */
.pillars { gap: 1.5rem; }
.pillar {
  background: var(--bg);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--c-brun);
  padding: 2rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.section--alt .pillar  { background: var(--bg); }
.section--beige .pillar { background: var(--bg); border-top-color: var(--c-brun-fonce); }
.pillar__num {
  font-family: var(--ff-display);
  font-weight: 900;
  font-size: 2rem;
  letter-spacing: var(--tracking-tight);
  color: var(--c-brun);
}
.pillar h3 { font-size: 1.25rem; }
.pillar p { color: var(--ink-muted); margin: 0; font-size: 0.95rem; }

/* Spec table ---------------------------------------------------------------- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}
.spec-table th, .spec-table td {
  text-align: left;
  padding: 1rem 1rem;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
.spec-table th {
  font-family: var(--ff-display);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: var(--tracking-tight);
  font-size: 0.85rem;
  color: var(--ink-muted);
  background: rgba(0,0,0,0.02);
}
.spec-table td:first-child { font-weight: 600; }
.spec-table td:last-child  { color: var(--ink-muted); font-size: 0.85rem; }

/* Stat block ---------------------------------------------------------------- */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0;
  border-top: 1px solid var(--rule);
}
.stat {
  padding: 2rem 1.5rem;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.stat:last-child { border-right: 0; }
.stat__label {
  font-size: var(--fs-eyebrow);
  font-weight: 600;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 0.6rem;
}
.stat__value {
  font-family: var(--ff-display);
  font-weight: 900;
  font-size: clamp(2rem, 1.5rem + 1.5vw, 3rem);
  line-height: 1;
  letter-spacing: var(--tracking-tight);
}
.stat__unit {
  font-size: 0.55em;
  color: var(--ink-muted);
  margin-left: 0.25rem;
}

/* Application cards --------------------------------------------------------- */
.app-card {
  background: var(--bg);
  border: 1px solid var(--rule);
  padding: 1.75rem;
}
.section--alt .app-card   { background: var(--bg); }
.section--beige .app-card { background: var(--bg); border-color: var(--rule-on-beige); }
.app-card h3 { font-size: 1.15rem; margin-bottom: 0.6rem; }
.app-card p { color: var(--ink-muted); font-size: 0.95rem; margin: 0; }
.app-card__icon {
  width: 36px; height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--c-brun);
  color: var(--c-os);
  font-family: var(--ff-display);
  font-weight: 900;
  font-size: 1rem;
  margin-bottom: 1rem;
}

/* Cert badges --------------------------------------------------------------- */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0;
  border-top: 1px solid rgba(229, 229, 217, 0.18);
  border-left: 1px solid rgba(229, 229, 217, 0.18);
}
.cert {
  padding: 2rem 1.5rem;
  border-right: 1px solid rgba(229, 229, 217, 0.18);
  border-bottom: 1px solid rgba(229, 229, 217, 0.18);
}
.cert__code {
  font-family: var(--ff-display);
  font-weight: 900;
  font-size: 1.5rem;
  letter-spacing: var(--tracking-tight);
  margin-bottom: 0.5rem;
  color: var(--c-os);
}
.cert__label {
  font-size: 0.85rem;
  color: rgba(229, 229, 217, 0.65);
}

/* CTA banner ---------------------------------------------------------------- */
.cta-banner {
  background: var(--c-brun-fonce);
  color: var(--c-os);
  padding-block: clamp(3rem, 6vw, 5rem);
}
.cta-banner__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}
@media (min-width: 820px) {
  .cta-banner__inner { grid-template-columns: 2fr 1fr; }
}
.cta-banner h2 { max-width: 18ch; }
.cta-banner .btn { background: var(--c-os); color: var(--c-basalte); border-color: var(--c-os); justify-self: start; }
@media (min-width: 820px) { .cta-banner .btn { justify-self: end; } }

/* Footer -------------------------------------------------------------------- */
.site-footer {
  background: var(--c-basalte);
  color: var(--c-os);
  padding-block: clamp(3rem, 5vw, 5rem) 2rem;
}
.site-footer__top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(229, 229, 217, 0.18);
}
@media (min-width: 720px) {
  .site-footer__top { grid-template-columns: 1.5fr 1fr 1fr 1fr; }
}
.site-footer h4 {
  font-family: var(--ff-body);
  font-size: var(--fs-eyebrow);
  font-weight: 600;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: rgba(229, 229, 217, 0.55);
  margin-bottom: 1rem;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.6rem; }
.site-footer a { font-size: 0.95rem; }
.site-footer a:hover { color: var(--c-beige); }
.site-footer__brand img {
  height: 32px;
  filter: invert(1);
  margin-bottom: 1rem;
}
.site-footer__tag { color: rgba(229, 229, 217, 0.7); font-size: 0.95rem; max-width: 32ch; }
.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 2rem;
  font-size: 0.8rem;
  color: rgba(229, 229, 217, 0.55);
  letter-spacing: 0.04em;
}

/* Page header (interior pages) --------------------------------------------- */
.page-head {
  background: var(--c-basalte);
  color: var(--c-os);
  padding-block: clamp(4rem, 8vw, 7rem);
}
.page-head .eyebrow { color: rgba(229, 229, 217, 0.6); margin-bottom: 1rem; }
.page-head h1 { max-width: 18ch; font-size: clamp(2.5rem, 1.5rem + 4vw, 5rem); }
.page-head p { color: rgba(229, 229, 217, 0.78); max-width: 60ch; margin-top: 1.5rem; font-size: 1.1rem; }

/* Two-column content ------------------------------------------------------- */
.split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 4vw, 4rem);
}
@media (min-width: 820px) {
  .split { grid-template-columns: 1fr 1.4fr; }
}

/* Contact form ------------------------------------------------------------- */
.form { display: grid; gap: 1.25rem; max-width: 540px; }
.form label {
  display: block;
  font-size: var(--fs-eyebrow);
  font-weight: 600;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 0.4rem;
}
.form input, .form textarea, .form select {
  width: 100%;
  font: inherit;
  padding: 0.85rem 1rem;
  background: var(--c-white); /* aux — required for input contrast */
  border: 1px solid var(--rule);
  color: var(--ink);
}
.form input:focus, .form textarea:focus, .form select:focus {
  outline: 2px solid var(--c-basalte);
  outline-offset: 2px;
}
.form textarea { min-height: 140px; resize: vertical; }

/* Utility ------------------------------------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.text-center { text-align: center; }