:root {
  --hi-ink: #0b1117;
  --hi-muted: #586775;
  --hi-line: #cfd9de;
  --hi-paper: #f7f8f7;
  --hi-mist: #edf2f3;
  --hi-stone: #e7e8e3;
  --hi-dark: #0c151c;
  --hi-dark-2: #132129;
  --hi-accent: #4ca7cc;
  --hi-accent-soft: #cce9f3;
  --hi-green: #8aa99f;
  --hi-shell: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body.hvac-intelligence-page {
  margin: 0;
  color: var(--hi-ink);
  background: var(--hi-paper);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.55;
  overflow-x: hidden;
}

.hvac-intelligence-page a { color: inherit; }

.hi-shell {
  width: min(calc(100% - 48px), var(--hi-shell));
  margin-inline: auto;
}

.hi-topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: 66px;
  background: rgba(248, 249, 248, .96);
  border-bottom: 1px solid rgba(11, 17, 23, .12);
  backdrop-filter: blur(14px);
}

.hi-nav {
  min-height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.hi-brand { flex: 0 0 auto; display: block; }
.hi-brand img { display: block; width: 156px; height: auto; }

.hvac-intelligence-page .nav-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 22px;
  min-width: 0;
}

.hvac-intelligence-page .nav-links a {
  position: relative;
  padding: 24px 0 21px;
  color: #26313a;
  font-size: 12px;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
}

.hvac-intelligence-page .nav-links a:hover,
.hvac-intelligence-page .nav-links a:focus-visible { color: #000; }

.hvac-intelligence-page .nav-links a.is-accent::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 15px;
  height: 2px;
  background: var(--hi-accent);
}

.hi-menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
}

.hi-menu-toggle span {
  display: block;
  width: 23px;
  height: 1px;
  margin: 6px auto;
  background: currentColor;
}

.hi-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  color: #fff;
  background: var(--hi-dark);
}

.hi-hero::before,
.hi-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  pointer-events: none;
}

.hi-hero::before {
  inset: 0;
  opacity: .2;
  background-image:
    linear-gradient(rgba(160, 205, 219, .25) 1px, transparent 1px),
    linear-gradient(90deg, rgba(160, 205, 219, .25) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to right, #000, transparent 78%);
}

.hi-hero::after {
  width: 46vw;
  height: 46vw;
  max-width: 720px;
  max-height: 720px;
  right: -15vw;
  top: -20vw;
  border: 1px solid rgba(110, 189, 220, .25);
  border-radius: 50%;
  box-shadow: 0 0 0 60px rgba(110, 189, 220, .025), 0 0 0 130px rgba(110, 189, 220, .02);
}

.hi-hero-grid {
  min-height: 720px;
  display: grid;
  grid-template-columns: minmax(0, .88fr) minmax(500px, 1.12fr);
  align-items: center;
  gap: 70px;
  padding-block: 76px 82px;
}

.hi-kicker {
  margin: 0 0 20px;
  color: #91c8dc;
  font-size: 12px;
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.hi-hero h1,
.hi-section h2,
.hi-dark-section h2,
.hi-final h2 {
  margin: 0;
  letter-spacing: 0;
  overflow-wrap: normal;
  word-break: normal;
  hyphens: none;
}

.hi-hero h1 {
  max-width: 660px;
  font-size: 66px;
  line-height: .98;
  font-weight: 800;
}

.hi-hero-lead {
  max-width: 620px;
  margin: 28px 0 0;
  color: #c9d2d7;
  font-size: 20px;
  line-height: 1.55;
}

.hi-market-line {
  margin: 30px 0 0;
  color: #91a0aa;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.hi-demo {
  min-width: 0;
  color: #111820;
  background: #f8faf9;
  border: 1px solid rgba(180, 209, 220, .44);
  box-shadow: 0 30px 80px rgba(0, 0, 0, .28);
}

.hi-demo-bar {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 22px;
  border-bottom: 1px solid var(--hi-line);
}

.hi-demo-title { min-width: 0; }
.hi-demo-title strong { display: block; font-size: 15px; line-height: 1.25; }
.hi-demo-title span { display: block; margin-top: 4px; color: #687783; font-size: 12px; }

.hi-ai-status {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #365968;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.hi-ai-status::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--hi-accent);
  box-shadow: 0 0 0 5px rgba(76, 167, 204, .15);
  animation: hi-pulse 2.4s ease-in-out infinite;
}

.hi-demo-body { padding: 24px; }

.hi-demo-disclosure {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 22px;
  padding: 13px 14px;
  color: #42535e;
  background: #eaf2f4;
  border-left: 3px solid var(--hi-accent);
  font-size: 13px;
  line-height: 1.45;
}

.hi-demo-disclosure strong { color: #15222a; }

.hi-demo-prompt {
  margin: 0 0 14px;
  font-size: 22px;
  line-height: 1.2;
  font-weight: 800;
}

.hi-demo textarea {
  width: 100%;
  min-height: 126px;
  resize: vertical;
  padding: 16px;
  color: #18232a;
  background: #fff;
  border: 1px solid #b9c6cc;
  border-radius: 2px;
  font: inherit;
  line-height: 1.5;
}

.hi-demo textarea:focus {
  outline: 2px solid rgba(76, 167, 204, .42);
  outline-offset: 1px;
  border-color: #4c93af;
}

.hi-demo-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 16px;
}

.hi-button,
.hi-text-button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

.hi-button {
  padding: 12px 22px;
  color: #fff;
  background: #152630;
}

.hi-button:hover,
.hi-button:focus-visible { background: #24485a; }

.hi-button.light { color: #10181e; background: #fff; }
.hi-button.light:hover,
.hi-button.light:focus-visible { background: #ddecf2; }

.hi-demo-note { color: #74818a; font-size: 11px; line-height: 1.45; }

.hi-demo-conversation { display: none; gap: 12px; }
.hi-demo.is-conversation .hi-demo-input { display: none; }
.hi-demo.is-conversation .hi-demo-conversation { display: grid; }

.hi-message {
  max-width: 88%;
  padding: 13px 15px;
  border-radius: 3px;
  font-size: 14px;
  line-height: 1.48;
  opacity: 0;
  transform: translateY(8px);
}

.hi-demo.is-conversation .hi-message { animation: hi-message-in .45s ease forwards; }
.hi-demo.is-conversation .hi-message:nth-child(2) { animation-delay: .3s; }
.hi-demo.is-conversation .hi-message:nth-child(3) { animation-delay: .65s; }
.hi-demo.is-conversation .hi-message:nth-child(4) { animation-delay: 1s; }

.hi-message.client { justify-self: end; color: #fff; background: #243944; }
.hi-message.ai { justify-self: start; background: #e4ecef; }
.hi-message.handoff { border-left: 3px solid var(--hi-accent); background: #d9eef5; }

.hi-demo-reset {
  justify-self: start;
  min-height: 44px;
  padding: 8px 0;
  color: #2b6075;
  background: transparent;
  border: 0;
  font: inherit;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
}

.hi-chat-lead {
  display: grid;
  gap: 14px;
  margin-top: 6px;
  padding: 18px;
  border: 1px solid #b7c7ce;
  background: #fff;
}

.hi-chat-lead-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.hi-chat-lead label { display: grid; gap: 7px; min-width: 0; }
.hi-chat-lead label span { color: #52656f; font-size: 11px; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.hi-chat-lead input {
  width: 100%;
  min-width: 0;
  min-height: 48px;
  padding: 11px 13px;
  color: #10181e;
  background: #f8faf9;
  border: 1px solid #b9c6cc;
  border-radius: 2px;
  font: inherit;
}
.hi-chat-lead input:focus { outline: 2px solid rgba(76, 167, 204, .42); outline-offset: 1px; border-color: #4c93af; }
.hi-chat-lead .hi-button { justify-self: start; }
.hi-chat-consent, .hi-chat-status { margin: 0; color: #74818a; font-size: 11px; line-height: 1.5; }
.hi-chat-status.is-error { color: #a82d2d; }
.hi-chat-status a { color: inherit; font-weight: 800; }
.hi-chat-success { display: grid; gap: 7px; margin: 0; color: #294e5d; }
.hi-chat-success strong { font-size: 19px; }
.hi-chat-success span { color: #536a74; line-height: 1.55; }

.hi-section,
.hi-dark-section { padding-block: 110px; }

.hi-section { background: var(--hi-paper); }
.hi-section.mist { background: var(--hi-mist); }
.hi-section.stone { background: var(--hi-stone); }

.hi-section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, .72fr);
  gap: 80px;
  align-items: end;
  margin-bottom: 54px;
}

.hi-section h2,
.hi-dark-section h2,
.hi-final h2 {
  max-width: 820px;
  font-size: 52px;
  line-height: 1.03;
  font-weight: 800;
}

.hi-section-head > p,
.hi-lead {
  margin: 0;
  color: var(--hi-muted);
  font-size: 19px;
  line-height: 1.6;
}

.hi-statement {
  max-width: 930px;
  margin: 0;
  font-size: 42px;
  line-height: 1.18;
  font-weight: 760;
}

.hi-statement strong { color: #2e6e86; }

.hi-examples {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--hi-line);
  border: 1px solid var(--hi-line);
}

.hi-example-card {
  min-width: 0;
  min-height: 310px;
  display: flex;
  flex-direction: column;
  padding: 30px;
  color: inherit;
  background: #fff;
  text-decoration: none;
  transition: background .2s ease, transform .2s ease;
}

.hi-example-card:hover,
.hi-example-card:focus-visible { background: #f0f6f7; transform: translateY(-2px); }
.hi-example-card span { color: #4d6570; font-size: 12px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.hi-example-card blockquote { margin: 28px 0 0; font-size: 21px; line-height: 1.42; font-weight: 650; }
.hi-example-card b { margin-top: auto; padding-top: 24px; font-size: 13px; }

.hi-four-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--hi-line);
  border-bottom: 1px solid var(--hi-line);
}

.hi-feature {
  min-width: 0;
  padding: 34px 28px 38px;
  border-right: 1px solid var(--hi-line);
}

.hi-feature:last-child { border-right: 0; }
.hi-feature h3 { margin: 0 0 18px; font-size: 24px; line-height: 1.12; }
.hi-feature p { margin: 0; color: var(--hi-muted); }

.hi-big-contrast {
  margin: 64px 0 0;
  padding-top: 40px;
  border-top: 1px solid var(--hi-line);
  font-size: 44px;
  line-height: 1.15;
  font-weight: 800;
}

.hi-process {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--hi-line);
}

.hi-process-step {
  position: relative;
  min-width: 0;
  padding: 30px 18px 34px 0;
  border-bottom: 1px solid var(--hi-line);
}

.hi-process-step:not(:last-child)::after {
  content: "";
  position: absolute;
  right: 12px;
  top: 39px;
  width: 26px;
  height: 1px;
  background: #78909b;
}

.hi-process-step:nth-child(3n)::after { display: none; }

.hi-process-step span { display: block; color: #6f808a; font-size: 11px; font-weight: 800; }
.hi-process-step h3 { margin: 30px 34px 10px 0; font-size: 16px; line-height: 1.2; }
.hi-process-step p { margin: 0 26px 0 0; color: var(--hi-muted); font-size: 13px; line-height: 1.5; }

.hi-dark-section {
  position: relative;
  overflow: hidden;
  color: #edf3f4;
  background: var(--hi-dark);
}

.hi-dark-section .hi-kicker { color: #8dc2d6; }
.hi-dark-section .hi-lead,
.hi-dark-section .hi-section-head > p { color: #afbdc4; }

.hi-integration-grid,
.hi-global-grid,
.hi-passport-grid,
.hi-ready-grid {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(480px, 1.1fr);
  gap: 80px;
  align-items: center;
}

.hi-integration-map {
  position: relative;
  min-height: 520px;
  display: grid;
  place-items: center;
}

.hi-core {
  position: relative;
  z-index: 2;
  width: 190px;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  padding: 26px;
  text-align: center;
  border: 1px solid #65acc7;
  border-radius: 50%;
  background: #142731;
  box-shadow: 0 0 0 28px rgba(95, 177, 208, .05), 0 0 0 64px rgba(95, 177, 208, .025);
}

.hi-core strong { font-size: 17px; line-height: 1.25; }

.hi-orbit-node {
  position: absolute;
  width: 150px;
  min-height: 70px;
  display: grid;
  place-items: center;
  padding: 12px;
  text-align: center;
  border: 1px solid #405560;
  background: #0f1c23;
  font-size: 13px;
  font-weight: 800;
}

.hi-orbit-node::before {
  content: "";
  position: absolute;
  z-index: -1;
  width: 150px;
  height: 1px;
  background: #405560;
  transform-origin: right center;
}

.hi-orbit-node.n1 { left: 0; top: 65px; }
.hi-orbit-node.n2 { right: 0; top: 65px; }
.hi-orbit-node.n3 { left: 0; bottom: 65px; }
.hi-orbit-node.n4 { right: 0; bottom: 65px; }
.hi-orbit-node.n5 { top: 0; left: 50%; transform: translateX(-50%); }
.hi-orbit-node.n6 { bottom: 0; left: 50%; transform: translateX(-50%); }
.hi-orbit-node.n1::before, .hi-orbit-node.n3::before { left: 100%; transform: rotate(24deg); }
.hi-orbit-node.n2::before, .hi-orbit-node.n4::before { right: 100%; transform: rotate(-24deg); }
.hi-orbit-node.n5::before { top: 100%; left: 50%; width: 110px; transform: rotate(90deg); }
.hi-orbit-node.n6::before { bottom: 100%; left: 50%; width: 110px; transform: rotate(90deg); }

.hi-global-visual {
  position: relative;
  min-height: 430px;
  border: 1px solid #374852;
  background:
    linear-gradient(125deg, transparent 46%, rgba(78, 159, 190, .12) 47%, transparent 48%),
    linear-gradient(35deg, transparent 48%, rgba(78, 159, 190, .10) 49%, transparent 50%);
}

.hi-global-center {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 150px;
  height: 150px;
  display: grid;
  place-items: center;
  padding: 18px;
  text-align: center;
  border-radius: 50%;
  background: #1b3541;
  border: 1px solid #61acc9;
  font-size: 14px;
  font-weight: 800;
}

.hi-location {
  position: absolute;
  display: grid;
  gap: 4px;
  color: #aebdc4;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .08em;
}

.hi-location::before { content: ""; width: 9px; height: 9px; border-radius: 50%; background: var(--hi-accent); }
.hi-location.l1 { left: 13%; top: 24%; }
.hi-location.l2 { left: 27%; bottom: 19%; }
.hi-location.l3 { right: 15%; top: 19%; }
.hi-location.l4 { right: 20%; bottom: 22%; }

.hi-local-note {
  margin-top: 24px;
  color: #8fadb8;
  font-size: 13px;
  text-align: center;
}

.hi-case-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.hi-case {
  min-width: 0;
  color: inherit;
  text-decoration: none;
  background: #fff;
  border: 1px solid var(--hi-line);
}

.hi-case-media { aspect-ratio: 4 / 3; overflow: hidden; background: #d8dedd; }
.hi-case-media img { width: 100%; height: 100%; display: block; object-fit: cover; transition: transform .5s ease; }
.hi-case:hover img { transform: scale(1.025); }
.hi-case-copy { padding: 24px; }
.hi-case-copy span { color: #60717b; font-size: 11px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.hi-case-copy h3 { margin: 14px 0 0; font-size: 22px; line-height: 1.18; }

.hi-passport-visual {
  padding: 34px;
  border: 1px solid #40535d;
  background: #101e25;
}

.hi-passport-title { display: flex; justify-content: space-between; gap: 20px; padding-bottom: 22px; border-bottom: 1px solid #40535d; }
.hi-passport-title strong { font-size: 18px; }
.hi-passport-title span { color: #84bfd5; font-size: 11px; font-weight: 800; letter-spacing: .1em; }
.hi-timeline { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 0; margin-top: 36px; }
.hi-timeline span { position: relative; min-height: 82px; padding: 25px 9px 0; border-top: 1px solid #56707b; color: #c0cbd0; font-size: 11px; text-align: center; }
.hi-timeline span::before { content: ""; position: absolute; top: -5px; left: 50%; width: 9px; height: 9px; border-radius: 50%; background: #70b4cf; }

.hi-passport-quote {
  margin: 38px 0 0;
  padding-top: 30px;
  border-top: 1px solid #40535d;
  font-size: 24px;
  line-height: 1.35;
  font-weight: 750;
}

.hi-ready-grid { align-items: stretch; }
.hi-ready-panel { padding: 40px; border: 1px solid var(--hi-line); background: #fff; }
.hi-ready-panel.dark { color: #fff; background: #132028; border-color: #31434d; }
.hi-ready-panel h3 { margin: 18px 0 16px; font-size: 34px; line-height: 1.08; }
.hi-ready-panel p { color: var(--hi-muted); }
.hi-ready-panel.dark p { color: #adbac1; }
.hi-badge { display: inline-flex; padding: 7px 10px; color: #16303b; background: var(--hi-accent-soft); font-size: 11px; font-weight: 900; letter-spacing: .1em; }
.hi-ready-flow { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; }
.hi-ready-flow span { padding: 9px 11px; border: 1px solid currentColor; font-size: 12px; }

.hi-faq { max-width: 900px; margin-left: auto; }
.hi-faq details { border-top: 1px solid var(--hi-line); }
.hi-faq details:last-child { border-bottom: 1px solid var(--hi-line); }
.hi-faq summary {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 0;
  font-size: 18px;
  font-weight: 750;
  cursor: pointer;
  list-style: none;
}
.hi-faq summary::-webkit-details-marker { display: none; }
.hi-faq summary::after { content: "+"; flex: 0 0 auto; font-size: 24px; font-weight: 400; }
.hi-faq details[open] summary::after { content: "−"; }
.hi-faq details p { max-width: 760px; margin: 0; padding: 0 0 26px; color: var(--hi-muted); }

.hi-final { padding-block: 110px; color: #fff; background: #101a21; }
.hi-final-grid { display: grid; grid-template-columns: minmax(0, .8fr) minmax(500px, 1.2fr); gap: 80px; align-items: center; }
.hi-final p { color: #b8c4ca; font-size: 18px; }

.hi-footer { color: #b9c3c7; background: #091117; border-top: 1px solid #263943; }
.hi-footer-grid { min-height: 144px; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 30px; }
.hi-footer-brand strong { display: block; color: #fff; font-size: 20px; }
.hi-footer-brand span { display: block; margin-top: 6px; font-size: 13px; }
.hi-footer-meta { text-align: right; font-size: 12px; line-height: 1.65; }

.hi-scenario-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.hi-scenario-tab { min-height: 44px; padding: 8px 15px; border: 1px solid #aebcc3; background: transparent; font: inherit; font-size: 13px; font-weight: 800; cursor: pointer; }
.hi-scenario-tab.is-active { color: #fff; background: #172932; border-color: #172932; }

.hi-chip-grid { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 20px; }
.hi-chip { min-height: 44px; padding: 8px 13px; border: 1px solid #aebbc1; background: #fff; font: inherit; font-size: 13px; cursor: pointer; }
.hi-chip.is-active { color: #fff; background: #1a3440; border-color: #1a3440; }
.hi-demo-stage { margin: 0 0 12px; color: #60727c; font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.hi-context-pill { display: none; margin-bottom: 16px; padding: 9px 12px; color: #335565; background: #dfeef3; font-size: 12px; }
.hi-context-pill.is-visible { display: block; }

.hi-reveal { opacity: 0; transform: translateY(10px); transition: opacity .6s ease, transform .6s ease; }
.hi-reveal.is-visible { opacity: 1; transform: none; }

.hi-ai-embed { padding-block: 84px; background: #eaf0f1; }
.hi-ai-embed .hi-demo { max-width: 930px; margin: 34px auto 0; box-shadow: 0 24px 65px rgba(13, 25, 32, .14); }
.hi-ai-embed .hi-section-head { margin-bottom: 0; }
.hi-digital-model { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; margin-top: 30px; background: #a8b8c0; border: 1px solid #a8b8c0; }
.hi-digital-model > div { min-height: 120px; padding: 22px; background: #fff; }
.hi-digital-model strong { display: block; margin-bottom: 8px; }
.hi-model-result { grid-column: 1 / -1; text-align: center; background: #162a34 !important; color: #fff; }

@keyframes hi-pulse { 50% { box-shadow: 0 0 0 9px rgba(76, 167, 204, .03); } }
@keyframes hi-message-in { to { opacity: 1; transform: none; } }

@media (max-width: 1080px) {
  .hvac-intelligence-page .nav-links { gap: 14px; }
  .hvac-intelligence-page .nav-links a { font-size: 11px; }
  .hi-hero-grid { grid-template-columns: minmax(0, .82fr) minmax(450px, 1.18fr); gap: 44px; }
  .hi-hero h1 { font-size: 56px; }
  .hi-examples, .hi-four-grid, .hi-case-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hi-feature:nth-child(2) { border-right: 0; }
  .hi-feature:nth-child(-n+2) { border-bottom: 1px solid var(--hi-line); }
  .hi-process { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .hi-integration-grid, .hi-global-grid, .hi-passport-grid, .hi-ready-grid { grid-template-columns: 1fr; }
  .hi-integration-map, .hi-global-visual { max-width: 720px; width: 100%; margin-inline: auto; }
}

@media (max-width: 860px) {
  .hi-shell { width: min(calc(100% - 36px), var(--hi-shell)); }
  .hi-menu-toggle { display: block; }
  .hvac-intelligence-page .nav-links {
    position: absolute;
    left: 0;
    right: 0;
    top: 66px;
    display: none;
    padding: 14px 18px 20px;
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    background: #f8f9f8;
    border-bottom: 1px solid #cbd4d8;
  }
  .hvac-intelligence-page .nav-links.open { display: flex; }
  .hvac-intelligence-page .nav-links a { min-height: 44px; padding: 15px 0 12px; border-bottom: 1px solid #dce3e6; font-size: 13px; }
  .hvac-intelligence-page .nav-links a.is-accent::after { display: none; }
  .hi-hero-grid { min-height: auto; grid-template-columns: 1fr; gap: 42px; padding-block: 64px 72px; }
  .hi-hero h1 { max-width: 720px; font-size: 54px; }
  .hi-hero-lead { font-size: 18px; }
  .hi-section, .hi-dark-section, .hi-final { padding-block: 82px; }
  .hi-section-head { grid-template-columns: 1fr; gap: 24px; margin-bottom: 40px; }
  .hi-section h2, .hi-dark-section h2, .hi-final h2 { font-size: 44px; }
  .hi-final-grid { grid-template-columns: 1fr; gap: 40px; }
  .hi-process { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hi-process-step:nth-child(3n)::after { display: block; }
  .hi-process-step:nth-child(even)::after { display: none; }
  .hi-footer-grid { grid-template-columns: 1fr; padding-block: 32px; }
  .hi-footer-meta { text-align: left; }
}

@media (max-width: 600px) {
  .hi-shell { width: min(calc(100% - 32px), var(--hi-shell)); }
  .hi-brand img { width: 132px; }
  .hi-hero-grid { gap: 34px; padding-block: 42px 54px; }
  .hi-hero h1 { font-size: 40px; line-height: 1.02; }
  .hi-hero-lead { margin-top: 22px; font-size: 17px; }
  .hi-market-line { line-height: 1.65; }
  .hi-demo-bar { min-height: 66px; padding: 15px 16px; }
  .hi-ai-status span { display: none; }
  .hi-demo-body { padding: 18px 16px; }
  .hi-demo-prompt { font-size: 19px; }
  .hi-demo textarea { min-height: 116px; }
  .hi-demo-actions { align-items: stretch; flex-direction: column; }
  .hi-button { width: 100%; }
  .hi-section, .hi-dark-section, .hi-final { padding-block: 66px; }
  .hi-section h2, .hi-dark-section h2, .hi-final h2 { font-size: 36px; line-height: 1.05; }
  .hi-statement { font-size: 30px; }
  .hi-examples, .hi-four-grid, .hi-case-grid, .hi-process { grid-template-columns: minmax(0, 1fr); }
  .hi-example-card { min-height: 260px; padding: 24px; }
  .hi-example-card blockquote { font-size: 19px; }
  .hi-feature { padding: 28px 0; border-right: 0; border-bottom: 1px solid var(--hi-line); }
  .hi-feature:last-child { border-bottom: 0; }
  .hi-big-contrast { margin-top: 45px; font-size: 31px; }
  .hi-process-step { padding: 24px 0; }
  .hi-process-step::after { display: none !important; }
  .hi-process-step h3 { margin-top: 12px; font-size: 20px; }
  .hi-process-step p { margin-right: 0; font-size: 15px; }
  .hi-integration-map { min-height: 640px; }
  .hi-core { width: 150px; }
  .hi-orbit-node { width: 128px; min-height: 62px; font-size: 11px; }
  .hi-orbit-node::before { display: none; }
  .hi-orbit-node.n1, .hi-orbit-node.n3 { left: 0; }
  .hi-orbit-node.n2, .hi-orbit-node.n4 { right: 0; }
  .hi-orbit-node.n5 { top: 45px; }
  .hi-orbit-node.n6 { bottom: 45px; }
  .hi-global-visual { min-height: 360px; }
  .hi-location.l1 { left: 7%; }
  .hi-location.l3 { right: 7%; }
  .hi-passport-visual, .hi-ready-panel { padding: 24px 18px; }
  .hi-timeline { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hi-timeline span { min-height: 66px; }
  .hi-passport-quote { font-size: 20px; }
  .hi-ready-panel h3 { font-size: 28px; }
  .hi-faq { margin-left: 0; }
  .hi-faq summary { font-size: 16px; }
  .hi-message { max-width: 94%; }
  .hi-chat-lead-grid { grid-template-columns: 1fr; }
  .hi-chat-lead .hi-button { width: 100%; }
  .hi-digital-model { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hi-ai-status::before,
  .hi-demo.is-conversation .hi-message { animation: none; }
  .hi-message { opacity: 1; transform: none; }
  .hi-reveal { opacity: 1; transform: none; transition: none; }
  .hi-case-media img, .hi-example-card { transition: none; }
}