:root {
  --bg: #0e0e0e;
  --bg-card: #161616;
  --bg-card-hover: #1e1e1e;
  --fg: #f0ebe4;
  --fg-muted: #8a857c;
  --accent: #ff6b35;
  --accent-dim: rgba(255, 107, 53, 0.12);
  --border: rgba(240, 235, 228, 0.08);
  --border-strong: rgba(240, 235, 228, 0.16);
}

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

html { font-size: 16px; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'DM Sans', sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ─── HERO ─── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 100px 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -120px;
  right: -200px;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(255,107,53,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -100px;
  left: -150px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255,107,53,0.04) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 80px;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  position: relative;
  z-index: 1;
}

.hero-stat-block {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-ring {
  position: absolute;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  border: 1px solid var(--border);
}

.hero-ring::before {
  content: '';
  position: absolute;
  top: 20px;
  left: 20px;
  right: 20px;
  bottom: 20px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
}

.hero-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  z-index: 1;
}

.hero-stat-num {
  font-family: 'Syne', sans-serif;
  font-size: 72px;
  font-weight: 800;
  line-height: 1;
  color: var(--accent);
  letter-spacing: -2px;
}

.hero-stat-label {
  font-size: 13px;
  color: var(--fg-muted);
  text-align: center;
  line-height: 1.4;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero-eyebrow {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  font-weight: 500;
}

.hero-headline {
  font-family: 'Syne', sans-serif;
  font-size: clamp(52px, 6vw, 80px);
  font-weight: 800;
  line-height: 1.0;
  letter-spacing: -1.5px;
  color: var(--fg);
}

.hero-sub {
  font-size: 18px;
  color: var(--fg-muted);
  max-width: 480px;
  line-height: 1.65;
}

/* ─── PROOF ─── */
.proof {
  padding: 100px 80px;
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, var(--bg) 0%, #111 100%);
}

.proof-header {
  max-width: 700px;
  margin: 0 auto 64px;
  text-align: center;
}

.proof-eyebrow {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-muted);
  margin-bottom: 16px;
}

.proof-headline {
  font-family: 'Syne', sans-serif;
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.5px;
}

.proof-list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.proof-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.2s;
}

.proof-item:hover { border-color: var(--border-strong); }

.proof-item-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.proof-item strong {
  display: block;
  font-family: 'Syne', sans-serif;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}

.proof-item p {
  font-size: 14px;
  color: var(--fg-muted);
  margin-bottom: 10px;
}

.proof-cost {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 4px 10px;
  border-radius: 20px;
}

.proof-footer {
  max-width: 600px;
  margin: 48px auto 0;
  text-align: center;
  font-size: 14px;
  color: var(--fg-muted);
}

/* ─── FEATURES ─── */
.features {
  padding: 100px 80px;
  border-top: 1px solid var(--border);
}

.features-header {
  max-width: 700px;
  margin: 0 auto 64px;
  text-align: center;
}

.features-headline {
  font-family: 'Syne', sans-serif;
  font-size: clamp(28px, 3.5vw, 42px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.5px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 1000px;
  margin: 0 auto;
}

.feature-card {
  padding: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  transition: border-color 0.2s, transform 0.2s;
  cursor: default;
}

.feature-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.feature-card-num {
  font-family: 'Syne', sans-serif;
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-family: 'Syne', sans-serif;
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.65;
  margin-bottom: 16px;
}

.feature-example {
  font-size: 12px;
  color: var(--fg);
  background: var(--bg-card-hover);
  border-left: 2px solid var(--accent);
  padding: 10px 14px;
  border-radius: 0 6px 6px 0;
  line-height: 1.5;
}

/* ─── HOW ─── */
.how {
  padding: 100px 80px;
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, #111 0%, var(--bg) 100%);
}

.how-header {
  text-align: center;
  margin-bottom: 64px;
}

.how-eyebrow {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-muted);
  margin-bottom: 16px;
}

.how-headline {
  font-family: 'Syne', sans-serif;
  font-size: clamp(28px, 4vw, 52px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -1px;
  color: var(--fg);
}

.how-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  max-width: 1000px;
  margin: 0 auto 64px;
}

.how-step {
  position: relative;
  padding-top: 48px;
}

.how-step::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 48px;
  height: 2px;
  background: var(--accent);
}

.how-step-num {
  font-family: 'Syne', sans-serif;
  font-size: 11px;
  font-weight: 600;
  color: var(--fg-muted);
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.how-step h3 {
  font-family: 'Syne', sans-serif;
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

.how-step p {
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.65;
}

.how-pricing {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  max-width: 700px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
}

.how-pricing-item {
  flex: 1;
  padding: 28px 24px;
  text-align: center;
}

.how-pricing-label {
  display: block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--fg-muted);
  margin-bottom: 8px;
}

.how-pricing-val {
  font-family: 'Syne', sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--fg);
}

.how-pricing-divider {
  width: 1px;
  height: 60px;
  background: var(--border);
}

/* ─── CLOSING ─── */
.closing {
  padding: 120px 80px;
  text-align: center;
}

.closing-inner {
  max-width: 700px;
  margin: 0 auto;
}

.closing-stat-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-muted);
  margin-bottom: 24px;
}

.closing-headline {
  font-family: 'Syne', sans-serif;
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -1.5px;
  margin-bottom: 32px;
}

.closing-body {
  font-size: 17px;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* ─── FOOTER ─── */
.footer {
  padding: 64px 80px;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-logo {
  font-family: 'Syne', sans-serif;
  font-size: 28px;
  font-weight: 800;
  color: var(--fg);
  margin-bottom: 12px;
}

.footer-tagline {
  font-size: 14px;
  color: var(--fg-muted);
  margin-bottom: 16px;
}

.footer-legal {
  font-size: 12px;
  color: rgba(138,133,124,0.5);
}

/* ─── DEMO HVAC ─── */
.demo-hvac {
  padding: 100px 80px;
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.demo-hvac-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  max-width: 1100px;
  margin: 0 auto;
}

.demo-hvac-left {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.demo-hvac-headline {
  font-family: 'Syne', sans-serif;
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -1px;
}

.demo-hvac-sub {
  font-size: 16px;
  color: var(--fg-muted);
  line-height: 1.65;
}

.demo-hvac-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.demo-tag {
  font-size: 12px;
  font-weight: 500;
  padding: 5px 12px;
  border: 1px solid var(--border-strong);
  border-radius: 20px;
  color: var(--fg-muted);
}

.demo-cta-btn {
  display: inline-block;
  padding: 14px 28px;
  background: var(--accent);
  color: #fff;
  border-radius: 10px;
  font-family: 'Syne', sans-serif;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  width: fit-content;
  transition: opacity 0.2s;
}

.demo-cta-btn:hover { opacity: 0.9; }

.demo-call-window {
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: 16px;
  overflow: hidden;
}

.demo-call-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: #1a1a1a;
  border-bottom: 1px solid var(--border);
}

.demo-call-dots { display: flex; gap: 6px; }
.demo-call-dots span { width: 12px; height: 12px; border-radius: 50%; background: #333; }
.demo-call-dots span:first-child { background: #ff5f57; }
.demo-call-dots span:nth-child(2) { background: #febc2e; }
.demo-call-dots span:last-child { background: #28c840; }

.demo-call-label { font-size: 12px; color: var(--fg-muted); font-weight: 500; }

.demo-call-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: 340px;
  overflow-y: auto;
}

.demo-msg { border-radius: 10px; padding: 12px 14px; }
.demo-msg-label { display: block; font-size: 10px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 4px; }
.demo-msg p { font-size: 13px; line-height: 1.5; }

.demo-msg-caller { background: #1c2d3d; border: 1px solid rgba(255,255,255,0.05); }
.demo-msg-caller .demo-msg-label { color: #7ab8d4; }
.demo-msg-caller p { color: #c8dce8; }

.demo-msg-ai { background: var(--accent-dim); border: 1px solid rgba(255,107,53,0.15); }
.demo-msg-ai .demo-msg-label { color: var(--accent); }
.demo-msg-ai p { color: var(--fg); }

.demo-msg-success { background: rgba(34,197,94,0.1); border-color: rgba(34,197,94,0.2); }
.demo-msg-success .demo-msg-label { color: #22c55e; }

.demo-call-footer {
  padding: 10px 20px;
  border-top: 1px solid var(--border);
  background: #111;
}

.demo-sms-indicator { font-size: 11px; color: #22c55e; }

/* ─── RESPONSIVE ─── */
@media (max-width: 900px) {
  .hero { padding: 80px 32px; }
  .hero-grid { grid-template-columns: 1fr; gap: 48px; }
  .hero-ring { display: none; }
  .hero-stat-block { display: none; }

  .proof, .features, .how, .closing { padding: 80px 32px; }

  .features-grid { grid-template-columns: 1fr; }
  .how-steps { grid-template-columns: 1fr; gap: 24px; }
  .how-pricing { flex-direction: column; }
  .how-pricing-divider { width: 100%; height: 1px; }
}

@media (max-width: 600px) {
  .hero, .proof, .features, .how, .closing, .footer {
    padding-left: 20px;
    padding-right: 20px;
  }
  .hero-headline { font-size: 44px; }
}