:root {
  color-scheme: light;
  --ink: #101720;
  --ink-2: #1a2733;
  --muted: #5f6f7d;
  --line: #dbe6ec;
  --paper: #f4f8fa;
  --white: #ffffff;
  --blue: #207ea0;
  --blue-dark: #0f536b;
  --amber: #d9902f;
  --green: #2f8f77;
  --night: #08131d;
  --shadow: 0 24px 70px rgba(9, 24, 36, 0.16);
  --radius: 8px;
  --wrap: min(1160px, calc(100% - 40px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Manrope", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.5;
  letter-spacing: 0;
  overflow-x: hidden;
}
body.menu-is-open { overflow: hidden; }
a { color: inherit; }
img { max-width: 100%; display: block; }
button, a { -webkit-tap-highlight-color: transparent; }

.site-header {
  position: absolute;
  inset: 0 0 auto 0;
  z-index: 30;
  color: var(--white);
}
.nav {
  width: var(--wrap);
  min-height: 82px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  text-decoration: none;
}
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.38);
  background: rgba(255,255,255,0.14);
  box-shadow: inset 0 -3px 0 rgba(255, 174, 70, 0.8);
  font-weight: 900;
}
.brand-copy { display: grid; gap: 2px; min-width: 0; }
.brand-copy strong { font-size: 0.98rem; line-height: 1.05; }
.brand-copy span { color: rgba(255,255,255,0.74); font-size: 0.78rem; line-height: 1.2; }
.header-actions { display: inline-flex; align-items: center; gap: 10px; }
.header-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid rgba(255,255,255,0.28);
  border-radius: 999px;
  color: rgba(255,255,255,0.92);
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 800;
  background: rgba(255,255,255,0.1);
  transition: background 160ms ease, border-color 160ms ease, transform 160ms ease;
}
.header-link:hover, .menu-button:hover { transform: translateY(-1px); border-color: rgba(255,255,255,0.5); background: rgba(255,255,255,0.18); }
.menu-button, .menu-close { appearance: none; border: 0; cursor: pointer; font: inherit; }
.menu-button {
  display: inline-grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 999px;
  color: var(--white);
  background: rgba(255,255,255,0.13);
  border: 1px solid rgba(255,255,255,0.3);
}
.hamburger, .hamburger::before, .hamburger::after {
  display: block;
  width: 19px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
}
.hamburger { position: relative; }
.hamburger::before, .hamburger::after { content: ""; position: absolute; left: 0; }
.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

.menu-modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: flex;
  justify-content: flex-end;
  background: rgba(5,10,15,0.68);
  backdrop-filter: blur(12px);
}
.menu-modal[hidden] { display: none; }
.menu-panel {
  width: min(500px, 100%);
  min-height: 100%;
  padding: 28px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 34px;
  background: #f8fafb;
  color: var(--ink);
  box-shadow: -24px 0 70px rgba(0,0,0,0.24);
}
.menu-top { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.menu-title { display: grid; gap: 4px; }
.menu-title span { color: var(--muted); font-size: 0.86rem; }
.menu-close {
  width: 46px;
  height: 46px;
  border-radius: 999px;
  display: inline-grid;
  place-items: center;
  color: var(--ink);
  background: #e9eef2;
  font-size: 1.7rem;
  line-height: 1;
}
.menu-nav { display: grid; gap: 12px; align-content: start; }
.menu-nav a {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
  font-weight: 850;
}
.menu-foot { display: grid; gap: 12px; }

.hero {
  min-height: 92vh;
  position: relative;
  display: grid;
  align-items: end;
  padding: 128px 0 70px;
  color: var(--white);
  background:
    linear-gradient(90deg, rgba(7,19,29,0.88), rgba(7,19,29,0.64) 44%, rgba(7,19,29,0.18)),
    url("/assets/hvac-seasonal-demand-hero.png") center / cover no-repeat;
}
.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 140px;
  background: linear-gradient(0deg, var(--paper), rgba(244,248,250,0));
}
.hero-inner {
  position: relative;
  z-index: 2;
  width: var(--wrap);
  margin: 0 auto;
}
.hero-copy {
  max-width: 820px;
  width: 100%;
  min-width: 0;
  display: grid;
  gap: 22px;
}
.eyebrow {
  margin: 0;
  color: #62d8ef;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 900;
}
h1, h2, h3, p { margin-top: 0; }
h1 {
  margin-bottom: 0;
  max-width: 800px;
  font-size: clamp(3.1rem, 7vw, 6.7rem);
  line-height: 0.92;
  letter-spacing: 0;
  text-wrap: balance;
}
h1 span { display: block; }
h2 {
  margin-bottom: 18px;
  font-size: clamp(2.1rem, 4vw, 4.3rem);
  line-height: 1;
  letter-spacing: 0;
}
h3 { margin-bottom: 10px; font-size: 1.12rem; line-height: 1.16; }
.lead {
  width: 100%;
  min-width: 0;
  max-width: 720px;
  color: rgba(255,255,255,0.86);
  font-size: clamp(1.08rem, 2vw, 1.35rem);
  overflow-wrap: break-word;
}
.hero-actions, .actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  max-width: 100%;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  text-align: center;
  font-weight: 900;
  font-size: 0.92rem;
  line-height: 1.16;
  background: var(--ink);
  color: var(--white);
  box-shadow: 0 16px 40px rgba(16,23,32,0.18);
}
.button.light { background: var(--white); color: var(--ink); }
.button.secondary { background: rgba(255,255,255,0.12); border-color: rgba(255,255,255,0.32); color: var(--white); box-shadow: none; }
.button.outline { background: transparent; border-color: var(--line); color: var(--ink); box-shadow: none; }
.trust-note { margin: 0; color: rgba(255,255,255,0.7); font-size: 0.9rem; max-width: 760px; }
.signal-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  max-width: 900px;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.22);
  background: rgba(255,255,255,0.18);
  backdrop-filter: blur(16px);
}
.signal-item { padding: 18px; background: rgba(8,19,29,0.34); display: grid; gap: 5px; }
.signal-item strong { font-size: 0.95rem; }
.signal-item span { color: rgba(255,255,255,0.75); font-size: 0.84rem; }

.section { padding: 92px 0; }
.section.compact { padding: 58px 0; }
.section.alt { background: #ffffff; }
.wrap { width: var(--wrap); margin: 0 auto; }
.split, .visual-split { display: grid; grid-template-columns: minmax(0, 0.95fr) minmax(320px, 1.05fr); gap: 48px; align-items: center; }
.section-kicker { color: var(--muted); font-size: clamp(1.05rem, 1.8vw, 1.35rem); max-width: 740px; }
.section-copy { max-width: 760px; }
.section-image-card, .system-art {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(255,255,255,0.76);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.section-image-card figcaption { padding: 14px 16px 16px; color: var(--muted); font-size: 0.86rem; }
.problem-grid, .offer-grid, .audience-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 34px;
}
.impact-card, .offer-card, .audience-card {
  min-height: 188px;
  padding: 24px;
  border-radius: var(--radius);
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: 0 18px 48px rgba(16,23,32,0.08);
}
.impact-card { border-top: 6px solid var(--blue); }
.impact-card:nth-child(2) { border-top-color: var(--amber); }
.impact-card:nth-child(3) { border-top-color: var(--green); }
.card-index { display: inline-block; margin-bottom: 42px; color: var(--muted); font-size: 0.76rem; font-weight: 900; }
.system-board {
  margin-top: 34px;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--night);
  color: var(--white);
  box-shadow: var(--shadow);
}
.system-row {
  display: grid;
  grid-template-columns: minmax(190px, 0.35fr) minmax(0, 0.65fr);
  gap: 20px;
  padding: 24px 28px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.system-row:nth-child(odd) { background: rgba(255,255,255,0.05); }
.system-row span { color: rgba(255,255,255,0.72); }
.timeline { display: grid; gap: 14px; }
.timeline-item {
  padding: 22px 24px;
  border-left: 6px solid var(--blue);
  border-radius: var(--radius);
  background: var(--white);
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.checklist {
  display: grid;
  gap: 13px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.checklist li {
  padding: 18px 18px 18px 46px;
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}
.checklist li::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 23px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 5px rgba(217,144,47,0.14);
}
.cta-section { background: var(--night); color: var(--white); }
.cta-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
}
.cta-band p { color: rgba(255,255,255,0.76); }
.article-hero {
  padding: 148px 0 72px;
  background: linear-gradient(135deg, #092031, #0d4255 54%, #ae6b24);
  color: var(--white);
}
.article {
  max-width: 850px;
  margin: 0 auto;
  padding: 70px 20px;
}
.article p, .article li { color: var(--muted); font-size: 1.05rem; }
.article h2 { font-size: clamp(1.8rem, 3vw, 2.7rem); margin-top: 48px; }
.article-card {
  padding: 28px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.page-footer { padding: 38px 0; background: #07131d; color: rgba(255,255,255,0.72); }
.footer-inner { width: var(--wrap); margin: 0 auto; display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap; }
.footer-inner a { color: #fff; }
.small { font-size: 0.88rem; color: var(--muted); }
code { padding: 2px 5px; border-radius: 5px; background: rgba(255,255,255,0.14); }

@media (max-width: 860px) {
  :root { --wrap: min(100% - 32px, 1160px); }
  .nav, .hero-inner, .wrap, .footer-inner {
    width: calc(100vw - 32px);
    max-width: calc(100vw - 32px);
  }
  .header-link { display: none; }
  .brand-copy span { display: none; }
  .hero { min-height: 88vh; padding-top: 116px; }
  .signal-strip, .split, .visual-split, .problem-grid, .offer-grid, .audience-grid, .cta-band { grid-template-columns: 1fr; }
  .system-row { grid-template-columns: 1fr; }
  h1 {
    max-width: 100%;
    font-size: clamp(1.7rem, 7.2vw, 2.2rem);
    line-height: 1.02;
    text-wrap: auto;
  }
  .hero-copy, .lead, .trust-note { max-width: 100%; }
  .lead { font-size: 0.96rem; }
  .signal-item span { overflow-wrap: break-word; }
  .hero-actions { align-items: stretch; }
  .hero-actions .button {
    width: 100%;
    min-height: 52px;
    padding: 12px 16px;
    font-size: 0.86rem;
  }
  .section { padding: 66px 0; }
  .menu-panel { padding: 24px; }
}

@media (max-width: 560px) {
  .nav, .hero-inner, .wrap, .footer-inner {
    width: min(calc(100vw - 32px), 358px);
    max-width: min(calc(100vw - 32px), 358px);
    margin-left: 16px;
    margin-right: 16px;
  }
}