/* ============================================
   MuTech Automation — Design System
   Engineering-flat, indigo + chrome
   Per CLAUDE_CODE_BRIEF.md
   ============================================ */

:root {
  /* Brand — indigo + chrome */
  --brand-indigo-50:  #EEEEF8;
  --brand-indigo-100: #D4D5EE;
  --brand-indigo-200: #A8AADD;
  --brand-indigo-400: #5C5FBF;
  --brand-indigo-600: #2D2E83;
  --brand-indigo-700: #232470;
  --brand-indigo-900: #0F1438;

  --brand-cobalt-500: #3B5BFF;
  --brand-cobalt-600: #2A45E0;

  --brand-chrome-100: #F2F2F4;
  --brand-chrome-300: #C8CACE;
  --brand-chrome-500: #8B8E96;

  /* Neutrals */
  --neutral-0:   #FFFFFF;
  --neutral-50:  #FAFAFB;
  --neutral-100: #F4F4F6;
  --neutral-200: #E5E5EA;
  --neutral-300: #D4D4DA;
  --neutral-400: #9CA0AA;
  --neutral-500: #6B6F78;
  --neutral-700: #3A3D45;
  --neutral-800: #1F2230;
  --neutral-900: #0A0E27;
  --neutral-950: #060818;

  /* Semantic */
  --success: #10B981;
  --live-pulse: #4ADE80;
  --warning: #F59E0B;
  --danger:  #EF4444;

  /* Type */
  --font-display: "Instrument Serif", "Times New Roman", serif;
  --font-body: "Geist", "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "Geist Mono", ui-monospace, "SF Mono", monospace;

  /* Layout */
  --max-w: 1280px;
  --pad-x: 24px;

  /* Borders */
  --border-thin: 0.5px;
  --border-color: var(--neutral-200);
  --border-color-dark: rgba(255, 255, 255, 0.12);

  /* Radius — keep flat */
  --r-sm: 4px;
  --r-md: 6px;
  --r-lg: 8px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--neutral-0);
  color: var(--neutral-900);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body { min-height: 100vh; overflow-x: hidden; }

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: transparent; }
img { max-width: 100%; display: block; }

/* ====== Type ====== */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.05;
  color: var(--neutral-900);
}
h1 { font-size: clamp(36px, 5vw, 64px); line-height: 1.02; }
h2 { font-size: clamp(28px, 3.6vw, 44px); }
h3 { font-size: clamp(22px, 2vw, 28px); }
h4 {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1.3;
}

p { color: var(--neutral-700); }
.lede { font-size: 17px; line-height: 1.55; color: var(--neutral-700); max-width: 60ch; }
.muted { color: var(--neutral-500); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--brand-indigo-400);
  font-weight: 500;
}
.eyebrow-light { color: var(--brand-indigo-200); }

.mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
}

.sku {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--brand-indigo-400);
  text-transform: uppercase;
}

em, .italic { font-style: italic; }

/* ====== Layout ====== */
.container {
  width: 100%;
  max-width: var(--max-w);
  padding-inline: var(--pad-x);
  margin: 0 auto;
}
section { position: relative; padding-block: 80px; }
@media (min-width: 768px) { section { padding-block: var(--section-pad, 112px); } }
section.compact { padding-block: 48px; }
@media (min-width: 768px) { section.compact { padding-block: 64px; } }

.section-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--brand-indigo-400);
  margin-bottom: 16px;
}

.bg-light { background: var(--neutral-50); }
.bg-dark { background: var(--neutral-900); color: var(--neutral-100); }
.bg-dark p, .bg-dark .muted { color: var(--neutral-400); }
.bg-dark h1, .bg-dark h2, .bg-dark h3, .bg-dark h4 { color: var(--neutral-0); }

/* ====== Buttons ====== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  border-radius: var(--r-md);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
  white-space: nowrap;
  border: var(--border-thin) solid transparent;
  font-family: var(--font-body);
}
.btn-primary {
  background: var(--brand-indigo-600);
  color: #fff;
}
.btn-primary:hover { background: var(--brand-indigo-700); }

.btn-cobalt { background: var(--brand-cobalt-500); color: #fff; }
.btn-cobalt:hover { background: var(--brand-cobalt-600); }

.btn-ghost {
  background: transparent;
  color: var(--neutral-900);
  border-color: var(--neutral-300);
}
.btn-ghost:hover { border-color: var(--neutral-700); }

.bg-dark .btn-ghost,
.btn-ghost-light {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.3);
}
.bg-dark .btn-ghost:hover,
.btn-ghost-light:hover { border-color: rgba(255, 255, 255, 0.6); }

.btn-link {
  color: var(--brand-indigo-600);
  font-weight: 500;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0;
}
.btn-link:hover { color: var(--brand-indigo-700); }
.btn-link::after { content: "→"; transition: transform .15s ease; display: inline-block; }
.btn-link:hover::after { transform: translateX(3px); }

.bg-dark .btn-link { color: var(--brand-indigo-200); }
.bg-dark .btn-link:hover { color: #fff; }

/* ====== Card ====== */
.card {
  background: var(--neutral-0);
  border: var(--border-thin) solid var(--neutral-200);
  border-radius: var(--r-md);
  position: relative;
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.card-hover:hover {
  border-color: var(--brand-indigo-200);
  transform: translateY(-1px);
}
.card-dark {
  background: var(--neutral-800);
  border-color: rgba(255, 255, 255, 0.08);
}
.card-dark:hover { border-color: rgba(168, 170, 221, 0.4); }

/* ====== Badge / chip ====== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--neutral-100);
  color: var(--neutral-700);
  border: var(--border-thin) solid var(--neutral-200);
  font-weight: 500;
}
.badge-indigo { background: var(--brand-indigo-50); color: var(--brand-indigo-600); border-color: var(--brand-indigo-100); }
.badge-cobalt { background: rgba(59, 91, 255, 0.08); color: var(--brand-cobalt-600); border-color: rgba(59, 91, 255, 0.2); }
.badge-success {
  background: rgba(74, 222, 128, 0.1);
  color: var(--success);
  border-color: rgba(74, 222, 128, 0.25);
}
.bg-dark .badge {
  background: rgba(255, 255, 255, 0.05);
  color: var(--neutral-300);
  border-color: rgba(255, 255, 255, 0.1);
}

/* ====== Utility bar ====== */
.utility-bar {
  height: 32px;
  background: var(--neutral-950);
  color: var(--neutral-400);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
}
.utility-bar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}
.utility-bar a { color: var(--neutral-400); }
.utility-bar a:hover { color: var(--neutral-100); }

/* ====== Header / Nav ====== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  border-bottom: var(--border-thin) solid var(--neutral-200);
}
.nav {
  display: flex;
  align-items: center;
  height: 64px;
  gap: 32px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.5px;
  color: var(--neutral-900);
  text-transform: uppercase;
}
.nav-logo img { height: 40px; width: auto; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  margin-right: auto;
}
.nav-links a {
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--neutral-700);
  transition: color .15s ease;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  position: relative;
}
.nav-links a:hover { color: var(--neutral-900); }
.nav-links a.active { color: var(--brand-indigo-600); }
.nav-cta { margin-left: auto; }
.nav-toggle { display: none; }

@media (max-width: 1080px) {
  .nav-links { display: none; }
  .nav-cta { margin-left: auto; }
  .nav-toggle {
    display: inline-flex;
    width: 36px; height: 36px;
    align-items: center; justify-content: center;
    border: var(--border-thin) solid var(--neutral-200);
    border-radius: var(--r-md);
  }
}

/* Mobile sheet menu */
.mobile-menu {
  position: fixed;
  inset: 0;
  background: rgba(10, 14, 39, 0.8);
  z-index: 200;
  display: flex;
  justify-content: flex-end;
}
.mobile-menu .panel {
  width: min(360px, 80vw);
  background: var(--neutral-0);
  height: 100%;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.mobile-menu .panel a {
  padding: 12px 0;
  font-size: 16px;
  border-bottom: var(--border-thin) solid var(--neutral-200);
  color: var(--neutral-900);
}

/* ====== Footer ====== */
.site-footer {
  background: var(--neutral-950);
  color: var(--neutral-400);
  padding-block: 64px;
  border-top: var(--border-thin) solid rgba(255, 255, 255, 0.06);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
  gap: 32px;
}
.footer-grid h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--neutral-300);
  margin-bottom: 14px;
  font-weight: 500;
}
.footer-grid ul { list-style: none; }
.footer-grid li { margin-bottom: 8px; }
.footer-grid a {
  font-size: 13px;
  color: var(--neutral-400);
}
.footer-grid a:hover { color: var(--neutral-0); }
.footer-bottom {
  margin-top: 56px;
  padding-top: 24px;
  border-top: var(--border-thin) solid rgba(255, 255, 255, 0.06);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--neutral-500);
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.footer-logo img { height: 44px; width: auto; }
.footer-logo span {
  font-family: var(--font-body);
  font-weight: 500;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--neutral-100);
  font-size: 14px;
}

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > div:first-child { grid-column: 1 / -1; margin-bottom: 16px; }
}

/* ====== Hero ====== */
.hero {
  position: relative;
  background: var(--neutral-900);
  color: var(--neutral-100);
  overflow: hidden;
  padding-block: 96px 80px;
}
.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 90% 80% at 50% 30%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 90% 80% at 50% 30%, #000 30%, transparent 80%);
  pointer-events: none;
}

/* ====== KPI strip ====== */
.kpi-strip {
  background: var(--neutral-900);
  border-top: var(--border-thin) solid rgba(255, 255, 255, 0.08);
  border-bottom: var(--border-thin) solid rgba(255, 255, 255, 0.08);
}
.kpi-strip .container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.kpi-cell {
  padding: 32px 24px;
  border-right: var(--border-thin) solid rgba(255, 255, 255, 0.08);
}
.kpi-cell:last-child { border-right: 0; }
.kpi-cell .num {
  font-family: var(--font-display);
  font-size: 40px;
  line-height: 1;
  color: #fff;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}
.kpi-cell .label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--neutral-400);
}
@media (max-width: 700px) {
  .kpi-strip .container { grid-template-columns: repeat(2, 1fr); }
  .kpi-cell { border-bottom: var(--border-thin) solid rgba(255, 255, 255, 0.08); }
  .kpi-cell:nth-child(2) { border-right: 0; }
  .kpi-cell .num { font-size: 32px; }
}

/* ====== Live telemetry strip ====== */
.live-strip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: rgba(255, 255, 255, 0.04);
  border: var(--border-thin) solid rgba(255, 255, 255, 0.1);
  border-radius: var(--r-md);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--neutral-300);
  letter-spacing: 0.02em;
}
.live-dot {
  width: 7px; height: 7px;
  background: var(--live-pulse);
  border-radius: 50%;
  position: relative;
  flex-shrink: 0;
}
.live-dot::before {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: var(--live-pulse);
  opacity: 0.4;
  animation: live-pulse 1.6s ease-out infinite;
}
.live-strip .label-live {
  color: var(--live-pulse);
  font-weight: 500;
  letter-spacing: 0.1em;
}
.live-strip .sep { color: var(--neutral-500); }

@keyframes live-pulse {
  0% { transform: scale(1); opacity: 0.5; }
  100% { transform: scale(2.2); opacity: 0; }
}

/* ====== Solutions / Cards ====== */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
@media (max-width: 900px) { .solutions-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .solutions-grid { grid-template-columns: 1fr; } }

.solution-card {
  padding: 24px;
  position: relative;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 220px;
}
.solution-card .icon-wrap {
  width: 36px; height: 36px;
  border: var(--border-thin) solid var(--neutral-200);
  border-radius: var(--r-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--brand-indigo-600);
  background: var(--neutral-50);
}
.solution-card .sku-top {
  position: absolute;
  top: 24px;
  right: 24px;
}
.solution-card h3 {
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 500;
  line-height: 1.3;
  color: var(--neutral-900);
  letter-spacing: 0;
}
.solution-card p { font-size: 13px; line-height: 1.5; color: var(--neutral-500); }
.solution-card .badges { display: flex; flex-wrap: wrap; gap: 4px; margin-top: auto; }

/* ====== Section head ====== */
.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 48px;
}
.section-head h2 { max-width: 700px; }
.section-head p { max-width: 50ch; margin-top: 12px; font-size: 15px; }
@media (max-width: 768px) {
  .section-head { flex-direction: column; align-items: start; }
}

/* ====== Industries row ====== */
.industries-row {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
}
.industry-cell {
  padding: 32px 16px;
  text-align: center;
  border: var(--border-thin) solid var(--neutral-200);
  border-radius: var(--r-md);
  background: var(--neutral-0);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  transition: border-color .15s ease, background .15s ease;
  cursor: pointer;
}
.industry-cell:hover { border-color: var(--brand-indigo-200); background: var(--brand-indigo-50); }
.industry-cell .icon-wrap { color: var(--brand-indigo-600); }
.industry-cell .label { font-size: 13px; font-weight: 500; color: var(--neutral-900); }
@media (max-width: 768px) { .industries-row { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 480px) { .industries-row { grid-template-columns: repeat(2, 1fr); } }

/* ====== Terminal block ====== */
.terminal {
  background: var(--neutral-950);
  border: var(--border-thin) solid rgba(255, 255, 255, 0.08);
  border-radius: var(--r-md);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  color: var(--neutral-300);
  overflow: hidden;
}
.terminal-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  border-bottom: var(--border-thin) solid rgba(255, 255, 255, 0.06);
  background: rgba(255, 255, 255, 0.02);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--neutral-500);
}
.terminal-bar .dot { width: 8px; height: 8px; border-radius: 50%; }
.terminal-bar .dot.r { background: #ff5f56; }
.terminal-bar .dot.y { background: #ffbd2e; }
.terminal-bar .dot.g { background: #27c93f; }
.terminal-body { padding: 16px; }
.terminal .ln-time { color: var(--neutral-500); }
.terminal .ln-info { color: var(--brand-indigo-200); }
.terminal .ln-ok { color: var(--success); }
.terminal .ln-warn { color: var(--warning); }

/* ====== Cobalt cross-promo ====== */
.cobalt-band {
  background: var(--brand-cobalt-500);
  color: #fff;
  padding-block: 80px;
  position: relative;
  overflow: hidden;
}
.cobalt-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(255, 255, 255, 0.08) 1px, transparent 0);
  background-size: 24px 24px;
  mask-image: linear-gradient(180deg, transparent 0%, black 30%, black 70%, transparent 100%);
}
.cobalt-band .container { position: relative; }
.cobalt-band h2 { color: #fff; font-family: var(--font-display); }
.cobalt-band p { color: rgba(255, 255, 255, 0.85); }

/* ====== Forms ====== */
.form-row {
  display: grid;
  gap: 16px;
}
.form-row.cols-2 { grid-template-columns: 1fr 1fr; }
@media (max-width: 600px) { .form-row.cols-2 { grid-template-columns: 1fr; } }

.form-field { display: flex; flex-direction: column; gap: 6px; }
.form-field label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--neutral-500);
  font-weight: 500;
}
.form-field input,
.form-field select,
.form-field textarea {
  font: inherit;
  font-size: 14px;
  padding: 11px 12px;
  border: var(--border-thin) solid var(--neutral-300);
  border-radius: var(--r-md);
  background: var(--neutral-0);
  color: var(--neutral-900);
  transition: border-color .15s, box-shadow .15s;
  font-family: var(--font-body);
}
.form-field textarea { min-height: 120px; resize: vertical; }
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--brand-indigo-600);
  box-shadow: 0 0 0 3px rgba(45, 46, 131, 0.12);
}
.form-field .err {
  font-size: 12px;
  color: var(--danger);
  font-family: var(--font-body);
}
.form-field input.invalid, .form-field textarea.invalid, .form-field select.invalid {
  border-color: var(--danger);
}

.checkbox-group { display: flex; flex-wrap: wrap; gap: 8px; }
.checkbox-pill {
  padding: 8px 12px;
  border: var(--border-thin) solid var(--neutral-300);
  border-radius: 100px;
  font-size: 13px;
  cursor: pointer;
  user-select: none;
  transition: all .15s;
  background: var(--neutral-0);
}
.checkbox-pill.selected {
  background: var(--brand-indigo-600);
  color: #fff;
  border-color: var(--brand-indigo-600);
}

/* ====== Trust row ====== */
.trust-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 48px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--neutral-500);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.trust-row .label {
  font-size: 11px;
  color: var(--neutral-400);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-right: 8px;
}

/* ====== Tabs ====== */
.tabs {
  display: flex;
  border-bottom: var(--border-thin) solid var(--neutral-200);
  gap: 0;
  margin-bottom: 32px;
  overflow-x: auto;
}
.tab {
  padding: 12px 20px;
  font-size: 13px;
  font-weight: 500;
  color: var(--neutral-500);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  white-space: nowrap;
  cursor: pointer;
  transition: color .15s, border-color .15s;
}
.tab:hover { color: var(--neutral-900); }
.tab.active { color: var(--brand-indigo-600); border-bottom-color: var(--brand-indigo-600); }

/* ====== Animations ====== */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fade-up .5s ease both; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ====== Decorative annotation lines for hero ====== */
.annotation {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand-indigo-200);
  display: flex;
  align-items: center;
  gap: 8px;
  pointer-events: none;
}
.annotation .dot {
  width: 6px; height: 6px;
  border: var(--border-thin) solid var(--brand-indigo-200);
  border-radius: 50%;
  position: relative;
}
.annotation .dot::after {
  content: "";
  position: absolute;
  inset: 1px;
  background: var(--brand-indigo-200);
  border-radius: 50%;
}
.annotation .line {
  height: 1px;
  background: linear-gradient(90deg, var(--brand-indigo-200), transparent);
  width: 60px;
}