/* ============================================
   THERMORA — design tokens
   Palette: graphite base, warm amber (heat) + cool cyan (cool)
   Type: Syne (display) / Readex Pro (body) / Fragment Mono (data)
   ============================================ */

:root{
  --graphite: #22282E;
  --graphite-deep: #171B1F;
  --amber: #E8834B;
  --amber-deep: #C86A36;
  --cyan: #4FC3D9;
  --cyan-deep: #359BAF;
  --cream: #F7F5F1;
  --cream-warm: #EFEAE1;
  --ink: #22262A;
  --ink-soft: #5B6167;
  --line: #E1DCD2;
  --white: #FFFFFF;

  --font-display: "Syne", sans-serif;
  --font-body: "Readex Pro", sans-serif;
  --font-mono: "Fragment Mono", monospace;

  --radius-lg: 22px;
  --radius-md: 14px;
  --radius-sm: 8px;

  --shadow-card: 0 14px 32px -16px rgba(34, 40, 46, 0.3);
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{ margin:0; font-family: var(--font-body); color: var(--ink); background: var(--cream); -webkit-font-smoothing: antialiased; }
img,svg{ display:block; max-width:100%; }
a{ color: inherit; text-decoration: none; }
ul,ol{ list-style: none; margin:0; padding:0; }
.wrap{ width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 32px; }

@media (prefers-reduced-motion: reduce){
  *{ animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

.eyebrow{ font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.05em; text-transform: uppercase; color: var(--amber-deep); margin: 0 0 14px; }
.eyebrow.center{ text-align:center; }
.section-title{ font-family: var(--font-display); font-weight: 700; font-size: clamp(1.9rem, 3vw, 2.6rem); line-height: 1.2; margin: 0 0 20px; color: var(--graphite); }
.section-title.center{ text-align:center; max-width: 680px; margin-left:auto; margin-right:auto; }

.btn{ display:inline-flex; align-items:center; justify-content:center; gap:8px; padding: 14px 28px; border-radius: 10px; font-weight: 600; font-size: 0.95rem; font-family: var(--font-display); border: 1.5px solid transparent; cursor:pointer; transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease; white-space: nowrap; }
.btn:hover{ transform: translateY(-2px); }
.btn:focus-visible{ outline: 3px solid var(--cyan); outline-offset: 2px; }
.btn-primary{ background: linear-gradient(90deg, var(--amber), var(--cyan)); color: var(--white); box-shadow: var(--shadow-card); }
.btn-primary:hover{ filter: brightness(0.94); }
.btn-ghost{ background: transparent; color: var(--graphite); border-color: var(--graphite); }
.btn-ghost:hover{ background: var(--graphite); color: var(--white); }
.btn-light{ background: var(--white); color: var(--graphite); }
.btn-light:hover{ background: var(--cream-warm); }

.site-header{ position: sticky; top:0; z-index: 50; background: rgba(247,245,241,0.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.header-inner{ display:flex; align-items:center; justify-content: space-between; padding: 16px 0; gap: 24px; }
.brand{ display:flex; align-items:center; gap:10px; font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; color: var(--graphite); }
.mark-ring{ fill:none; stroke: var(--graphite); stroke-width: 2; }
.mark-warm{ fill:none; stroke: var(--amber); stroke-width: 2.5; stroke-linecap:round; }
.mark-cool{ fill:none; stroke: var(--cyan); stroke-width: 2.5; stroke-linecap:round; }
.main-nav{ display:flex; gap: 28px; font-weight: 600; font-size: 0.92rem; flex: 1; justify-content: center; }
.main-nav a{ color: var(--ink-soft); transition: color .15s; }
.main-nav a:hover{ color: var(--graphite); }
.nav-cta{ flex-shrink:0; }
.nav-toggle{ display:none; }

.hero{ padding: 76px 0 56px; overflow:hidden; }
.hero-inner{ display:grid; grid-template-columns: 1.1fr 0.9fr; align-items:center; gap: 48px; }
.hero h1{ font-family: var(--font-display); font-weight: 700; font-size: clamp(2.2rem, 4vw, 3.1rem); line-height: 1.16; margin: 0 0 22px; color: var(--graphite); }
.hero-sub{ font-size: 1.05rem; line-height: 1.65; color: var(--ink-soft); max-width: 480px; margin: 0 0 32px; }
.hero-actions{ display:flex; gap:16px; flex-wrap:wrap; margin-bottom: 40px; }
.hero-trust{ display:flex; gap: 36px; }
.hero-trust strong{ display:block; font-family: var(--font-display); font-size: 1.5rem; color: var(--amber-deep); }
.hero-trust span{ font-size: 0.76rem; color: var(--ink-soft); font-family: var(--font-mono); }

.hero-art{ position:relative; }
.hero-ring{ fill: var(--cream-warm); }
.flow{ fill:none; stroke-width: 4; stroke-linecap:round; opacity:0.85; }
.flow-warm{ stroke: var(--amber); }
.flow-cool{ stroke: var(--cyan); }
.unit-body{ fill: var(--white); stroke: var(--graphite); stroke-width: 2.5; }
.unit-panel{ fill: var(--cream-warm); stroke: var(--graphite); stroke-width:1.5; }
.unit-dial-warm{ fill: var(--amber); }
.unit-dial-cool{ fill: var(--cyan); }
.unit-dial-neutral{ fill: var(--line); }
.unit-vent{ fill: var(--graphite); }
.vent-line{ stroke: var(--cream); stroke-width: 2; }
.unit-group{ animation: hum2 4s ease-in-out infinite; transform-origin: 240px 430px; }
@keyframes hum2{ 0%,100%{ transform: translateY(0);} 50%{ transform: translateY(-4px);} }

.features{ padding: 88px 0; background: var(--white); }
.feature-grid{ display:grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin-top: 48px; }
.feature-card{ background: var(--cream); border-radius: var(--radius-lg); padding: 34px 28px; border: 1px solid var(--line); }
.feature-icon{ display:inline-flex; align-items:center; justify-content:center; width: 52px; height:52px; border-radius: 50%; background: var(--cream-warm); margin-bottom: 18px; }
.feature-icon svg circle{ fill:none; stroke: var(--amber); stroke-width:2.5; }
.feature-card h3{ font-family: var(--font-display); font-size: 1.2rem; margin: 0 0 10px; color: var(--graphite); }
.feature-card p{ color: var(--ink-soft); line-height: 1.6; margin:0; }

.how{ padding: 88px 0; background: var(--graphite); color: var(--cream); }
.how-inner{ display:grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items:start; }
.how .eyebrow{ color: var(--cyan); }
.how .section-title{ color: var(--white); }
.how-steps{ display:flex; flex-direction:column; gap: 24px; }
.how-step{ display:flex; gap: 18px; }
.how-step-num{ flex-shrink:0; width: 32px; height:32px; border-radius: 50%; background: var(--amber); color: var(--white); display:flex; align-items:center; justify-content:center; font-family: var(--font-display); font-weight:700; font-size:0.9rem; }
.how-step h4{ font-family: var(--font-display); font-size: 1.15rem; margin: 0 0 6px; color: var(--white); }
.how-step p{ margin:0; color: rgba(247,245,241,0.75); line-height:1.55; font-size:0.93rem; }
.how-card{ background: var(--white); color: var(--ink); border-radius: var(--radius-md); padding: 28px; font-family: var(--font-mono); }
.how-card-head{ font-size:0.82rem; padding-bottom:16px; border-bottom: 2px solid var(--graphite); margin-bottom: 12px; color: var(--graphite); font-weight:700; }
.how-row{ display:flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px dashed var(--line); font-size:0.85rem; }
.how-card-foot{ margin-top:16px; font-size:0.72rem; color: var(--ink-soft); }

.compare{ padding: 88px 0; }
.compare-table{ max-width: 780px; margin: 48px auto 0; border: 1px solid var(--line); border-radius: var(--radius-md); overflow:hidden; background: var(--white); }
.compare-row{ display:grid; grid-template-columns: 1.4fr 1fr 1.2fr; }
.compare-row:not(:last-child){ border-bottom: 1px solid var(--line); }
.compare-row span{ padding: 16px 18px; font-size: 0.9rem; }
.compare-row span:first-child{ color: var(--graphite); font-weight:600; }
.compare-head{ background: var(--graphite); color: var(--white); font-family: var(--font-display); font-weight:700; }
.compare-head span{ padding: 14px 18px; }
.compare-row .yes{ color: var(--cyan-deep); font-weight:700; }
.compare-row .neutral{ color: var(--ink-soft); }
.compare-footnote{ max-width:780px; margin: 18px auto 0; font-size:0.82rem; color: var(--ink-soft); text-align:center; }

.faq{ padding: 88px 0; background: var(--white); }
.faq-inner{ max-width: 760px; }
.faq-list{ display:flex; flex-direction:column; gap: 14px; margin-top: 32px; }
details{ background: var(--cream); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 18px 22px; }
summary{ cursor:pointer; font-weight:600; font-family: var(--font-display); color: var(--graphite); list-style:none; display:flex; justify-content: space-between; align-items:center; gap:16px; }
summary::-webkit-details-marker{ display:none; }
summary::after{ content:"+"; font-size:1.4rem; color: var(--amber); flex-shrink:0; }
details[open] summary::after{ content:"–"; }
details p{ margin: 14px 0 0; color: var(--ink-soft); line-height:1.6; }

.cta-band{ background: linear-gradient(90deg, var(--amber), var(--cyan)); padding: 64px 0; }
.cta-band-inner{ display:flex; align-items:center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.cta-band h2{ font-family: var(--font-display); font-weight:700; font-size: clamp(1.5rem,2.6vw,2.1rem); color: var(--white); margin:0; max-width: 540px; }

.site-footer{ background: var(--graphite-deep); color: rgba(247,245,241,0.8); padding: 64px 0 0; }
.footer-grid{ display:grid; grid-template-columns: 1fr 2fr; gap: 40px; padding-bottom: 48px; border-bottom: 1px solid rgba(255,255,255,0.12); }
.footer-brand{ display:flex; gap:12px; align-items:flex-start; }
.footer-brand .mark-ring{ stroke: var(--cream); }
.footer-brand p{ font-size: 0.9rem; line-height:1.5; margin:0; }
.footer-links{ display:grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.footer-links h4{ font-family: var(--font-mono); font-size:0.74rem; text-transform:uppercase; letter-spacing:0.06em; color: var(--cyan); margin: 0 0 14px; }
.footer-links a{ display:block; padding: 6px 0; color: rgba(247,245,241,0.8); font-size:0.92rem; }
.footer-links a:hover{ color: var(--white); }
.footer-legal{ padding: 24px 0 32px; font-size: 0.76rem; color: rgba(247,245,241,0.5); line-height:1.6; display:flex; flex-direction:column; gap:8px; }

.main-nav.nav-open{ display:flex; flex-direction:column; position:absolute; top:100%; left:0; right:0; background: var(--cream); border-bottom: 1px solid var(--line); padding: 8px 32px 20px; gap: 4px; }
.main-nav.nav-open a{ padding: 10px 0; border-bottom: 1px solid var(--line); }
.nav-toggle.is-active span:nth-child(1){ transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-active span:nth-child(2){ opacity:0; }
.nav-toggle.is-active span:nth-child(3){ transform: translateY(-7px) rotate(-45deg); }
.nav-toggle span{ transition: transform .2s ease, opacity .2s ease; }
.reveal-ready{ opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal-in{ opacity: 1; transform: translateY(0); }

@media (max-width: 900px){
  .main-nav{ display:none; }
  .hero-inner{ grid-template-columns: 1fr; }
  .hero-art{ order:-1; max-width: 320px; margin: 0 auto; }
  .feature-grid{ grid-template-columns: 1fr; }
  .how-inner{ grid-template-columns: 1fr; }
  .compare-row{ grid-template-columns: 1.2fr 1fr 1fr; }
  .compare-row span{ padding: 12px 10px; font-size:0.82rem; }
  .footer-grid{ grid-template-columns: 1fr; }
  .footer-links{ grid-template-columns: repeat(3,1fr); }
  .nav-cta{ display:none; }
  .nav-toggle{ display:flex; flex-direction:column; gap:5px; background:none; border:none; cursor:pointer; padding:6px; }
  .nav-toggle span{ width:22px; height:2px; background: var(--graphite); }
}
@media (max-width: 520px){
  .wrap{ padding: 0 20px; }
  .hero{ padding-top: 40px; }
  .hero-trust{ gap: 22px; flex-wrap: wrap; }
  .compare-row{ grid-template-columns: 1.3fr 0.9fr 0.9fr; }
  .cta-band-inner{ justify-content:center; text-align:center; }
}