/* ============================================================
   smart42 — static site stylesheet
   Palette (strictly white / yellow / black + grayscale):
     --white   #FFFFFF
     --ink     #0D0D0D   (near-black text)
     --black   #000000
     --yellow  #F4C61E   (single accent — used sparingly)
     --gray-1  #F5F5F3   (lightest surface)
     --gray-2  #E7E5DF   (borders / dividers)
     --gray-3  #9C9A92   (muted text)
     --gray-4  #4A4842   (secondary dark surface)
   ============================================================ */

:root {
  --white: #FFFFFF;
  --ink: #0D0D0D;
  --black: #000000;
  --yellow: #F4C61E;
  --gray-1: #F5F5F3;
  --gray-2: #E7E5DF;
  --gray-3: #9C9A92;
  --gray-4: #4A4842;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--white);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--yellow); color: var(--black); }

a:focus-visible, button:focus-visible, input:focus-visible,
textarea:focus-visible, select:focus-visible, summary:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--yellow);
  color: var(--black);
  padding: 10px 16px;
  z-index: 100;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- layout helpers ---------- */
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 72px 0; border-top: 1px solid var(--gray-2); }
.section:first-of-type { border-top: none; }
.section-tight { padding: 56px 0; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--gray-4);
}
.eyebrow.accent { color: var(--ink); background: var(--yellow); display: inline-block; padding: 4px 10px; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.12;
  margin: 0;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2rem, 4.4vw, 3.4rem); }
h2 { font-size: clamp(1.5rem, 2.6vw, 2rem); margin-bottom: 8px; }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; color: var(--gray-4); }
.lede { font-size: 1.15rem; color: var(--gray-4); max-width: 640px; }
.muted { color: var(--gray-3); }
.section-intro { max-width: 720px; margin-bottom: 40px; }

.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-6 { grid-template-columns: repeat(6, 1fr); }
@media (max-width: 920px) {
  .grid-4, .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-6 { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4, .grid-6 { grid-template-columns: 1fr; }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.92rem;
  border: 1px solid var(--ink);
  white-space: nowrap;
}
.btn-primary { background: var(--ink); color: var(--white); }
.btn-primary:hover { background: var(--black); }
.btn-accent { background: var(--yellow); color: var(--black); border-color: var(--yellow); }
.btn-accent:hover { background: #E0B70F; }
.btn-outline { background: transparent; color: var(--ink); }
.btn-outline:hover { background: var(--gray-1); }
.btn-ghost-inverse { border-color: var(--white); color: var(--white); }

/* ---------- header / nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.93);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--gray-2);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 16px 0; }
.logo { font-family: var(--font-display); font-size: 1.25rem; font-weight: 700; }
.logo .num { font-family: var(--font-mono); color: var(--black); background: var(--yellow); padding: 0 4px; }
.nav-primary { display: none; align-items: center; gap: 30px; font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; }
.nav-primary a:hover { color: var(--gray-4); border-bottom: 2px solid var(--yellow); }
.nav-cta { display: none; }
.nav-toggle { background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle svg { width: 26px; height: 26px; }

@media (min-width: 1000px) {
  .nav-primary { display: flex; }
  .nav-cta { display: inline-flex; }
  .nav-toggle { display: none; }
}

.has-menu { position: relative; }
.mega-menu {
  display: none;
  position: absolute; left: 50%; top: 100%; transform: translateX(-50%);
  width: 640px; background: var(--white); border: 1px solid var(--gray-2);
  border-radius: 12px; padding: 28px; box-shadow: 0 18px 40px rgba(0,0,0,0.08);
}
.has-menu:hover .mega-menu, .has-menu:focus-within .mega-menu { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.mega-col-label { font-family: var(--font-mono); font-size: 0.65rem; text-transform: uppercase; color: var(--gray-3); margin-bottom: 10px; }
.mega-item { display: block; margin-bottom: 16px; text-transform: none; letter-spacing: normal; }
.mega-item .mi-title { font-family: var(--font-display); font-weight: 600; font-size: 0.92rem; }
.mega-item .mi-desc { font-size: 0.78rem; color: var(--gray-3); margin-top: 3px; }
.mega-item:hover .mi-title { color: var(--gray-4); text-decoration: underline; text-decoration-color: var(--yellow); text-decoration-thickness: 2px; }

.mobile-nav {
  display: none;
  flex-direction: column;
  padding: 8px 24px 24px;
  border-top: 1px solid var(--gray-2);
  font-family: var(--font-mono);
  text-transform: uppercase;
  font-size: 0.85rem;
}
.mobile-nav.open { display: flex; }
.mobile-nav a { padding: 10px 0; border-bottom: 1px solid var(--gray-2); }
.mobile-nav .cta-link { color: var(--black); background: var(--yellow); text-align: center; border-radius: 999px; margin-top: 14px; padding: 12px; }
@media (min-width: 1000px) { .mobile-nav { display: none !important; } }

/* ---------- breadcrumbs ---------- */
.breadcrumbs { font-family: var(--font-mono); font-size: 0.72rem; color: var(--gray-3); padding-top: 20px; }
.breadcrumbs a:hover { color: var(--ink); }
.breadcrumbs .sep { margin: 0 6px; }
.breadcrumbs .current { color: var(--ink); }

/* ---------- hero ---------- */
.hero { padding: 56px 0 72px; }
.hero.split { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; }
@media (max-width: 920px) { .hero.split { grid-template-columns: 1fr; } }
.hero-cta-row { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }
.hero p.lede { margin-top: 20px; }

/* mini 4x2 visual for hero */
.mini-system { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.mini-cell { border: 1px solid var(--gray-2); background: var(--gray-1); border-radius: 10px; padding: 16px; }
.mini-cell .mc-label { font-family: var(--font-mono); font-size: 0.7rem; color: var(--ink); }
.mini-loops { grid-column: span 2; display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.mini-loops div { border-radius: 10px; text-align: center; padding: 10px; font-family: var(--font-mono); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.05em; }
.mini-loops .learn { background: var(--ink); color: var(--white); }
.mini-loops .execute { background: var(--yellow); color: var(--black); }

/* ---------- cards ---------- */
.card {
  border: 1px solid var(--gray-2);
  border-radius: 12px;
  padding: 22px;
  background: var(--white);
}
.card-surface { background: var(--gray-1); }
.card-dark { background: var(--ink); color: var(--white); border-color: var(--gray-4); }
.card-dark p, .card-dark .muted { color: #C9C7BF; }
.situation-card { display: block; transition: box-shadow .15s ease; }
.situation-card:hover { box-shadow: 0 8px 24px rgba(0,0,0,0.08); }
.situation-card .tag { margin-top: 16px; display: flex; align-items: center; gap: 6px; font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink); font-weight: 600; }
.situation-card .tag .chip { background: var(--yellow); padding: 1px 6px; border-radius: 4px; }

.service-card ul { margin: 14px 0 0; padding: 0; list-style: none; font-size: 0.9rem; color: var(--gray-4); }
.service-card li { padding: 3px 0; }
.service-card .cat { font-family: var(--font-mono); font-size: 0.68rem; text-transform: uppercase; letter-spacing: .07em; background: var(--yellow); display: inline-block; padding: 3px 8px; border-radius: 4px; color: var(--black); }
.service-card h3 { margin-top: 12px; }
.service-card .go { margin-top: 18px; display: inline-flex; align-items: center; gap: 6px; font-family: var(--font-mono); font-size: 0.75rem; font-weight: 700; }

/* ---------- system diagram ---------- */
.system-diagram { background: var(--ink); color: var(--white); border-radius: 16px; padding: 40px; }
.system-diagram .layers { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
@media (max-width: 800px) { .system-diagram .layers { grid-template-columns: 1fr; } }
.layer-btn {
  text-align: left; background: transparent; border: 1px solid var(--gray-4); border-radius: 10px;
  padding: 18px; color: var(--white); cursor: pointer; width: 100%; font-family: inherit;
}
.layer-btn .idx { font-family: var(--font-mono); font-size: 0.72rem; color: var(--yellow); }
.layer-btn .q { margin-top: 8px; font-size: 0.85rem; color: #C9C7BF; }
.layer-btn[aria-expanded="true"] { border-color: var(--yellow); background: #1B1A16; }
.loops-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 12px; }
@media (max-width: 640px) { .loops-row { grid-template-columns: 1fr; } }
.loops-row div { border: 1px solid var(--gray-4); border-radius: 10px; text-align: center; padding: 14px; font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: .06em; color: #C9C7BF; }
.loops-row .execute { background: var(--yellow); color: var(--black); border-color: var(--yellow); }
.layer-panel {
  margin-top: 16px; background: #1B1A16; border-radius: 10px; padding: 20px;
  display: none;
}
.layer-panel.open { display: flex; flex-wrap: wrap; gap: 28px; align-items: flex-start; }
.layer-panel .label { font-family: var(--font-mono); font-size: 0.68rem; text-transform: uppercase; color: var(--yellow); margin-bottom: 8px; }
.layer-panel .chips { display: flex; flex-wrap: wrap; gap: 6px; }
.layer-panel .chips span { border: 1px solid var(--gray-4); border-radius: 999px; padding: 4px 10px; font-size: 0.8rem; color: #C9C7BF; }
.layer-panel ul { margin: 0; padding: 0; list-style: none; font-size: 0.85rem; color: #C9C7BF; }
.layer-panel .goto { margin-left: auto; font-family: var(--font-mono); font-size: 0.75rem; color: var(--yellow); font-weight: 700; }

/* ---------- process ---------- */
.process-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
@media (max-width: 900px) { .process-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 560px) { .process-grid { grid-template-columns: 1fr 1fr; } }
.process-step { border-top: 2px solid var(--ink); padding-top: 12px; }
.process-step.mark { border-top-color: var(--yellow); }
.process-step .n { font-family: var(--font-mono); font-size: 0.72rem; color: var(--gray-3); }
.process-step .t { font-family: var(--font-display); font-weight: 600; margin-top: 2px; }
.process-step .o { font-size: 0.85rem; color: var(--gray-4); margin-top: 2px; }

/* ---------- case cards ---------- */
.case-card { border-radius: 14px; background: var(--ink); color: var(--white); padding: 24px; display: flex; flex-direction: column; }
.case-card .cat { font-family: var(--font-mono); font-size: 0.68rem; text-transform: uppercase; color: var(--yellow); }
.case-card .client { font-size: 0.78rem; color: var(--gray-3); margin-top: 2px; }
.case-card h3 { margin-top: 12px; font-size: 1.1rem; }
.case-card .chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.case-card .chips span { border: 1px solid var(--gray-4); border-radius: 999px; padding: 3px 9px; font-size: 0.72rem; color: #C9C7BF; }
.case-card .results-label { font-family: var(--font-mono); font-size: 0.68rem; text-transform: uppercase; color: var(--gray-3); margin-top: 20px; }
.case-card dl { margin: 8px 0 0; }
.case-card .metric-row { display: flex; justify-content: space-between; border-top: 1px solid var(--gray-4); padding: 6px 0; font-size: 0.88rem; }
.case-card .metric-row .v { font-family: var(--font-mono); color: var(--yellow); font-weight: 700; }
.case-card .go { margin-top: 18px; font-family: var(--font-mono); font-size: 0.75rem; font-weight: 700; color: var(--yellow); }

/* ---------- decision table ---------- */
table.decision { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
table.decision th { text-align: left; font-family: var(--font-mono); font-size: 0.68rem; text-transform: uppercase; color: var(--gray-3); border-bottom: 1px solid var(--gray-2); padding: 10px 20px 10px 0; }
table.decision td { padding: 14px 20px 14px 0; border-bottom: 1px solid var(--gray-2); color: var(--gray-4); }
table.decision td:last-child, table.decision th:last-child { font-weight: 600; color: var(--ink); }

/* ---------- faq ---------- */
.faq-item { border-bottom: 1px solid var(--gray-2); }
.faq-item summary {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 0; cursor: pointer; list-style: none; font-family: var(--font-display); font-weight: 600;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary .icon { font-family: var(--font-mono); font-size: 1.1rem; }
.faq-item[open] summary .icon::before { content: "−"; }
.faq-item summary .icon::before { content: "+"; }
.faq-item .answer { padding: 0 0 18px; color: var(--gray-4); max-width: 680px; }

/* ---------- before/after ---------- */
.before-after { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
@media (max-width: 700px) { .before-after { grid-template-columns: 1fr; } }
.ba-col { border-radius: 12px; padding: 22px; border: 1px solid var(--gray-2); }
.ba-col.after { border-color: var(--yellow); border-width: 2px; }
.ba-col ul { margin: 12px 0 0; padding: 0; list-style: none; font-size: 0.9rem; color: var(--gray-4); }
.ba-col li { padding: 4px 0; }

/* ---------- metrics grid (case detail) ---------- */
.metric-tile { border: 1px solid var(--gray-2); border-radius: 12px; padding: 18px; background: var(--gray-1); }
.metric-tile .k { font-size: 0.85rem; color: var(--gray-3); }
.metric-tile .v { font-family: var(--font-display); font-size: 1.6rem; font-weight: 700; margin-top: 4px; color: var(--ink); }
.metric-tile .v .yellow-mark { background: var(--yellow); padding: 0 4px; }

/* ---------- photo placeholder ---------- */
.photo-placeholder {
  position: relative;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 10px;
  background: repeating-linear-gradient(45deg, var(--gray-1), var(--gray-1) 10px, #EFEEE8 10px, #EFEEE8 20px);
  border: 2px dashed var(--gray-3);
  border-radius: 12px;
  color: var(--gray-4);
  text-align: center;
  padding: 32px 20px;
  min-height: 220px;
}
.photo-placeholder svg { width: 34px; height: 34px; opacity: .55; }
.photo-placeholder .ph-label { font-family: var(--font-mono); font-size: 0.68rem; text-transform: uppercase; letter-spacing: .08em; background: var(--yellow); color: var(--black); padding: 3px 8px; border-radius: 4px; }
.photo-placeholder .ph-desc { font-size: 0.82rem; max-width: 320px; }
.photo-placeholder .ph-dims { font-family: var(--font-mono); font-size: 0.7rem; color: var(--gray-3); }

/* ---------- final CTA ---------- */
.cta-section { background: var(--ink); color: var(--white); text-align: center; }
.cta-section p { color: #C9C7BF; max-width: 560px; margin: 14px auto 0; }
.cta-section h2 { color: var(--white); }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--gray-2); padding: 56px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 32px; }
@media (max-width: 800px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 500px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-col-label { font-family: var(--font-mono); font-size: 0.68rem; text-transform: uppercase; color: var(--gray-3); margin-bottom: 12px; }
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: 8px; font-size: 0.9rem; }
.footer-col a:hover { color: var(--gray-4); }
.footer-bottom { margin-top: 44px; padding-top: 24px; border-top: 1px solid var(--gray-2); display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-family: var(--font-mono); font-size: 0.72rem; color: var(--gray-3); }

/* ---------- contact form ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 640px) { .form-grid { grid-template-columns: 1fr; } }
.field label { display: block; font-size: 0.88rem; font-weight: 600; margin-bottom: 6px; }
.field .req { color: var(--ink); background: var(--yellow); padding: 0 3px; border-radius: 3px; font-size: 0.7rem; vertical-align: middle; }
.field input, .field select, .field textarea {
  width: 100%; border: 1px solid var(--gray-2); border-radius: 8px; padding: 10px 12px;
  font-family: var(--font-body); font-size: 0.92rem; background: var(--white); color: var(--ink);
}
.field input:invalid[data-touched="true"], .field.error input, .field.error select, .field.error textarea { border-color: var(--ink); }
.field .err { font-size: 0.78rem; margin-top: 4px; display: none; }
.field.error .err { display: block; }
.form-note { font-size: 0.85rem; padding: 12px 14px; background: var(--gray-1); border-radius: 8px; display: none; }
.form-note.show { display: block; }
.form-success { display: none; border: 1px solid var(--gray-2); border-radius: 12px; padding: 32px; text-align: center; }
.form-success.show { display: block; }

/* ---------- 404 ---------- */
.not-found { text-align: center; padding: 120px 0; }
.not-found .code { font-family: var(--font-mono); color: var(--ink); background: var(--yellow); display: inline-block; padding: 4px 12px; border-radius: 6px; }

/* generic utility */
.mt-8 { margin-top: 8px; } .mt-16 { margin-top: 16px; } .mt-24 { margin-top: 24px; } .mt-40 { margin-top: 40px; }
.flex { display: flex; } .items-center { align-items: center; } .gap-8 { gap: 8px; } .gap-12 { gap: 12px; } .flex-wrap { flex-wrap: wrap; }
.chip { border: 1px solid var(--gray-2); border-radius: 999px; padding: 4px 12px; font-size: 0.85rem; color: var(--gray-4); }