/* RoboCircuit — The Loop design system */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,400&family=IBM+Plex+Mono:wght@500&family=Outfit:wght@600;700&display=swap');

:root {
  --graphite: #0D1117;
  --slate: #161B22;
  --mint: #E6F4F1;
  --teal: #3DDBB4;
  --copper: #C17F59;
  --grey: #8B929E;
  --font-display: 'Outfit', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
  --max-width: 1200px;
  --section-pad: clamp(4rem, 8vw, 8.75rem);
  --radius: 4px;
  --transition: 0.25s ease;
}

*, *::before, *::after { 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;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: currentColor;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover { opacity: 0.85; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  margin-top: 0;
}

h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); font-weight: 600; }

p { margin: 0 0 1.25rem; }

ul, ol { margin: 0 0 1.25rem; padding-left: 1.5rem; }

/* Surface system */
.surface-graphite { background-color: var(--graphite); color: var(--mint); }
.surface-mint { background-color: var(--mint); color: var(--graphite); }
.surface-slate { background-color: var(--slate); color: var(--mint); }
.surface-teal { background-color: var(--teal); color: var(--graphite); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 1rem;
}

.surface-mint .eyebrow { color: var(--graphite); opacity: 0.7; }

.hairline {
  border: none;
  border-top: 1px solid rgba(61, 219, 180, 0.35);
  margin: 0;
}

.surface-mint .hairline { border-top-color: rgba(13, 17, 23, 0.15); }

/* Layout */
.container {
  width: min(100% - 2.5rem, var(--max-width));
  margin-inline: auto;
}

.section { padding-block: var(--section-pad); }

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transition: background-color var(--transition), box-shadow var(--transition);
}

.site-header.is-scrolled {
  background-color: var(--mint);
  color: var(--graphite);
  box-shadow: 0 1px 0 rgba(13, 17, 23, 0.08);
}

.site-header.is-scrolled .eyebrow,
.site-header.is-scrolled .nav-link { color: var(--graphite); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.25rem;
  max-width: var(--max-width);
  margin-inline: auto;
}

.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo span { color: var(--teal); }

.site-header.is-scrolled .logo span { color: var(--graphite); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid currentColor;
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  cursor: pointer;
  color: inherit;
  border-radius: var(--radius);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
}

.nav-link:hover { text-decoration: underline; }

/* Buttons */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9375rem;
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius);
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: filter var(--transition), box-shadow var(--transition);
}

.btn:hover { filter: brightness(1.05); box-shadow: 0 4px 20px rgba(0,0,0,0.15); }

.btn-primary {
  background-color: var(--teal);
  color: var(--graphite);
  border-color: var(--teal);
}

.btn-secondary {
  background: transparent;
  color: inherit;
  border-color: currentColor;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
}

/* Hero */
.hero-loop {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  overflow: hidden;
}

@media (max-width: 768px) {
  .hero-loop { min-height: 82vh; }
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('/images/robocircuit-01-hero-bench.jpg');
  background-size: cover;
  background-position: center;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(13,17,23,0.55) 0%, rgba(13,17,23,0.92) 70%, var(--graphite) 100%);
  z-index: 1;
}

.hero-glow {
  position: absolute;
  bottom: 20%;
  left: 10%;
  width: 60%;
  height: 40%;
  background: radial-gradient(ellipse, rgba(61,219,180,0.12) 0%, transparent 70%);
  z-index: 2;
  pointer-events: none;
}

.hero-topbar {
  position: relative;
  z-index: 10;
  padding-top: 6rem;
}

.hero-topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal);
  padding-bottom: 1rem;
}

.hero-content {
  position: relative;
  z-index: 10;
  padding-bottom: 3rem;
}

.hero-content h1 {
  max-width: 14ch;
  margin-bottom: 1.5rem;
}

.hero-content .highlight { color: var(--copper); }

.hero-sub {
  max-width: 34rem;
  opacity: 0.85;
  font-size: 1.125rem;
}

.hero-trust {
  position: relative;
  z-index: 10;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--grey);
  padding-block: 1.25rem;
  letter-spacing: 0.04em;
}

/* Loop trace motif */
.loop-trace {
  position: relative;
  z-index: 5;
  padding-block: 2rem 3rem;
}

.loop-trace svg {
  width: 100%;
  max-width: 900px;
  height: auto;
  margin-inline: auto;
  display: block;
}

.loop-trace .trace-path {
  fill: none;
  stroke: var(--teal);
  stroke-width: 1;
  opacity: 0.6;
}

.js .loop-trace .trace-path {
  stroke-dasharray: 800;
  stroke-dashoffset: 800;
}

.js .loop-trace.is-visible .trace-path {
  animation: drawTrace 2s ease forwards;
}

@keyframes drawTrace {
  to { stroke-dashoffset: 0; }
}

.loop-nodes {
  display: flex;
  justify-content: space-between;
  max-width: 900px;
  margin: 1rem auto 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--teal);
}

.loop-nodes span::before {
  content: '●';
  color: var(--copper);
  margin-right: 0.5rem;
  font-size: 0.5rem;
  vertical-align: middle;
}

/* Metrics */
.metric-trio {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  text-align: center;
}

@media (max-width: 640px) {
  .metric-trio { grid-template-columns: 1fr; }
}

.metric-value {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 500;
  color: var(--teal);
  line-height: 1;
}

.surface-mint .metric-value { color: var(--graphite); }

.metric-label {
  font-size: 0.875rem;
  margin-top: 0.5rem;
  opacity: 0.8;
}

/* Stages grid */
.stages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

@media (max-width: 900px) {
  .stages-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .stages-grid { grid-template-columns: 1fr; }
}

.stage-card {
  padding: 1.75rem;
  border: 1px solid rgba(61, 219, 180, 0.25);
  border-radius: var(--radius);
  background: rgba(230, 244, 241, 0.04);
}

.surface-mint .stage-card {
  background: rgba(13, 17, 23, 0.03);
  border-color: rgba(13, 17, 23, 0.12);
}

.stage-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--teal);
  margin-bottom: 0.75rem;
}

.surface-mint .stage-num { color: var(--copper); }

/* Capabilities */
.cap-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

@media (max-width: 900px) {
  .cap-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .cap-grid { grid-template-columns: 1fr; }
}

.cap-card {
  position: relative;
  padding: 2rem 1.75rem;
  border: 1px solid rgba(61, 219, 180, 0.3);
  border-radius: var(--radius);
  background: rgba(22, 27, 34, 0.6);
  overflow: hidden;
}

.cap-card .lc-num {
  position: absolute;
  top: 0.5rem;
  right: 1rem;
  font-family: var(--font-mono);
  font-size: 3.5rem;
  font-weight: 500;
  opacity: 0.06;
  line-height: 1;
  pointer-events: none;
}

/* Cards & grids */
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

@media (max-width: 768px) {
  .card-grid { grid-template-columns: 1fr; }
}

.content-card {
  border: 1px solid rgba(61, 219, 180, 0.2);
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(22, 27, 34, 0.5);
}

.surface-mint .content-card {
  background: var(--mint);
  border-color: rgba(13, 17, 23, 0.1);
  box-shadow: 0 4px 24px rgba(13, 17, 23, 0.06);
}

.content-card img { width: 100%; aspect-ratio: 16/10; object-fit: cover; }

.content-card-body { padding: 1.75rem; }

/* Photo frame */
.photo-frame {
  border: 1px solid rgba(61, 219, 180, 0.35);
  border-radius: var(--radius);
  overflow: hidden;
}

.photo-frame img { width: 100%; }

/* Two column */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

@media (max-width: 768px) {
  .split { grid-template-columns: 1fr; }
}

/* FAQ */
.faq-list { list-style: none; padding: 0; margin: 0; }

.faq-item {
  border-bottom: 1px solid rgba(61, 219, 180, 0.2);
  padding-block: 1.5rem;
}

.surface-mint .faq-item { border-bottom-color: rgba(13, 17, 23, 0.12); }

.faq-item summary {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.125rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: '+';
  font-family: var(--font-mono);
  color: var(--teal);
  flex-shrink: 0;
}

.faq-item[open] summary::after { content: '−'; }

.faq-answer { padding-top: 1rem; opacity: 0.9; }

/* Forms */
.contact-form {
  max-width: 36rem;
  width: 100%;
  display: flex;
  flex-direction: column;
}

.form-group { margin-bottom: 1.5rem; }

.form-group label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.5rem;
  font-size: 0.9375rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  font-family: var(--font-body);
  font-size: 1rem;
  border: 1px solid rgba(13, 17, 23, 0.2);
  border-radius: var(--radius);
  background: #fff;
  color: var(--graphite);
}

.form-group textarea { min-height: 140px; resize: vertical; }

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.checkbox-group input { width: auto; margin-top: 0.25rem; flex-shrink: 0; }

.checkbox-group label {
  margin: 0;
  font-weight: 400;
  font-size: 0.875rem;
  flex: 1;
  min-width: 0;
  line-height: 1.5;
}

.contact-form .btn-primary {
  align-self: flex-start;
}

.hp-field {
  position: absolute;
  left: -9999px;
  opacity: 0;
  height: 0;
  overflow: hidden;
}

/* Page hero (inner pages) */
.page-hero {
  padding-top: 8rem;
  padding-bottom: 3rem;
}

.page-hero h1 { margin-bottom: 1rem; }

.page-hero .lead {
  font-size: 1.25rem;
  max-width: 42rem;
  opacity: 0.85;
}

/* Service discipline */
.service-block {
  padding-block: 2.5rem;
  border-bottom: 1px solid rgba(61, 219, 180, 0.15);
}

.surface-mint .service-block { border-bottom-color: rgba(13, 17, 23, 0.1); }

.service-block:last-child { border-bottom: none; }

/* Work case */
.case-study {
  margin-bottom: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(61, 219, 180, 0.15);
}

.surface-mint .case-study { border-bottom-color: rgba(13, 17, 23, 0.1); }

/* Legal prose */
.legal-content h2 {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  font-size: 1.5rem;
}

.legal-content h3 {
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

/* CTA band */
.cta-band {
  text-align: center;
  padding-block: 4rem;
}

.cta-band h2 { margin-bottom: 1rem; }

.cta-band p {
  max-width: 36rem;
  margin-inline: auto;
  opacity: 0.85;
}

/* Footer */
.site-footer {
  padding-block: 3.5rem 2rem;
  font-size: 0.9375rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr; }
}

.footer-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.125rem;
  margin-bottom: 1rem;
}

.footer-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-nav li { margin-bottom: 0.5rem; }

.footer-nav a { text-decoration: none; font-size: 0.875rem; }

.footer-nav a:hover { text-decoration: underline; }

.footer-disclaimer {
  font-size: 0.8125rem;
  opacity: 0.75;
  line-height: 1.6;
  padding-top: 2rem;
  border-top: 1px solid rgba(230, 244, 241, 0.15);
}

.surface-mint .footer-disclaimer { border-top-color: rgba(13, 17, 23, 0.1); }

.footer-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  opacity: 0.6;
  margin-top: 1.5rem;
}

/* Cookie banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 200;
  padding: 1.5rem;
  background: var(--slate);
  color: var(--mint);
  border-top: 1px solid rgba(61, 219, 180, 0.3);
  box-shadow: 0 -8px 32px rgba(0,0,0,0.3);
}

.cookie-banner[hidden] { display: none; }

.cookie-inner {
  max-width: var(--max-width);
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: center;
  justify-content: space-between;
}

.cookie-text {
  flex: 1 1 300px;
  font-size: 0.875rem;
  line-height: 1.5;
}

.cookie-text a { color: var(--teal); }

.cookie-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.cookie-actions .btn {
  padding: 0.625rem 1.25rem;
  font-size: 0.8125rem;
}

/* Cookie modal */
.cookie-modal {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: rgba(13, 17, 23, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.cookie-modal[hidden] { display: none; }

.cookie-modal-panel {
  background: var(--mint);
  color: var(--graphite);
  max-width: 480px;
  width: 100%;
  padding: 2rem;
  border-radius: var(--radius);
  max-height: 90vh;
  overflow-y: auto;
}

.cookie-pref {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
  border-bottom: 1px solid rgba(13, 17, 23, 0.1);
}

.cookie-pref label { font-weight: 500; }

.cookie-pref input[type="checkbox"] { width: 1.25rem; height: 1.25rem; }

/* Reveal animations */
.js .reveal {
  opacity: 1;
  transform: translateY(0);
}

.js .reveal:not(.is-visible) {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* 404 */
.error-page {
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 6rem;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--teal);
  margin-bottom: 1rem;
}

/* Thanks page */
.thanks-page {
  min-height: 70vh;
  display: flex;
  align-items: center;
  padding-top: 6rem;
}

/* Mobile nav */
@media (max-width: 768px) {
  .nav-toggle { display: block; }

  .nav-list {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--mint);
    color: var(--graphite);
    padding: 1.5rem;
    gap: 1rem;
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  }

  .nav-list.is-open { display: flex; }

  .site-header.is-scrolled .nav-list { background: var(--mint); }
}

/* Utility */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-lg { margin-bottom: 2rem; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}