:root {
  --bg: #0A0A0A;
  --surface: #141414;
  --surface2: #1E1E1E;
  --accent: #FF4D00;
  --accent-dim: rgba(255, 77, 0, 0.15);
  --text: #F5F0E8;
  --text-muted: #7A7570;
  --text-dim: #4A4540;
  --border: rgba(245, 240, 232, 0.08);
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* NAV */
.nav {
  padding: 20px 40px;
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 16px;
}
.nav-logo {
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 800;
  font-size: 22px;
  letter-spacing: 4px;
  color: var(--text);
}
.nav-tagline {
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: 1px;
}

/* HERO */
.hero {
  padding: 80px 40px 100px;
}
.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.hero-eyebrow {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}
.hero-headline {
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 800;
  font-size: 68px;
  line-height: 1.0;
  letter-spacing: -1px;
  color: var(--text);
  margin-bottom: 24px;
}
.hero-sub {
  font-size: 18px;
  color: var(--text-muted);
  line-height: 1.65;
  max-width: 460px;
}

/* ZONE DISPLAY */
.zone-display {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 36px;
  text-align: left;
}
.zone-label {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.zone-number {
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 800;
  font-size: 140px;
  line-height: 1;
  color: var(--accent);
  margin-bottom: 20px;
}
.zone-bar {
  display: flex;
  gap: 6px;
  margin-bottom: 20px;
}
.zone-segment {
  height: 8px;
  flex: 1;
  border-radius: 2px;
  background: var(--surface2);
}
.zone-segment.active {
  background: var(--accent);
}
.zone-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 20px;
}
.zone-bpm {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 32px;
  font-weight: 700;
  color: var(--text);
}
.bpm-unit {
  font-size: 16px;
  color: var(--text-muted);
  font-weight: 400;
}
.zone-pct {
  font-size: 14px;
  color: var(--text-muted);
}
.zone-coach-cue {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--accent-dim);
  border: 1px solid rgba(255, 77, 0, 0.3);
  border-radius: 8px;
  padding: 10px 16px;
}
.cue-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  animation: pulse 1.5s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.cue-text {
  font-size: 14px;
  color: var(--text);
  font-weight: 500;
}

/* DEMO SECTION */
.demo-section {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 80px 40px;
}
.demo-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.demo-head {
  max-width: 600px;
  margin: 0 auto 60px;
  text-align: center;
}
.demo-title {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 42px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}
.demo-desc {
  color: var(--text-muted);
  font-size: 17px;
}
.demo-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}
.stat-card {
  background: var(--surface);
  padding: 36px 28px;
  text-align: center;
}
.stat-num {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 36px;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 8px;
  letter-spacing: 1px;
}
.stat-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-family: 'Barlow Condensed', sans-serif;
}
.stat-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* HOW IT WORKS */
.howitworks {
  padding: 100px 40px;
}
.how-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.how-title {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 42px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 60px;
}
.how-steps {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px 80px;
}
.step {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}
.step-num {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 48px;
  font-weight: 800;
  color: var(--text-dim);
  line-height: 1;
  flex-shrink: 0;
  width: 60px;
}
.step-body h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}
.step-body p {
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.6;
}

/* WORKOUT TYPES */
.workouttypes {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 100px 40px;
}
.wt-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.wt-title {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 42px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 50px;
}
.wt-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.wt-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
}
.wt-icon {
  margin-bottom: 20px;
}
.wt-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
}
.wt-card p {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.6;
}

/* CLOSING */
.closing {
  padding: 100px 40px 120px;
}
.closing-inner {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}
.closing-badge {
  display: inline-block;
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(255, 77, 0, 0.4);
  background: var(--accent-dim);
  border-radius: 100px;
  padding: 6px 18px;
  margin-bottom: 28px;
}
.closing-headline {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 52px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.5px;
  margin-bottom: 24px;
}
.closing-body {
  color: var(--text-muted);
  font-size: 18px;
  line-height: 1.65;
}

/* FOOTER */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 40px;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.footer-logo {
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 800;
  font-size: 18px;
  letter-spacing: 4px;
  display: block;
  margin-bottom: 6px;
}
.footer-copy {
  font-size: 13px;
  color: var(--text-muted);
}
.footer-note {
  font-size: 12px;
  color: var(--text-dim);
}

/* MOBILE */
@media (max-width: 768px) {
  .hero { padding: 60px 24px 80px; }
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero-headline { font-size: 48px; }
  .zone-number { font-size: 100px; }
  .demo-section, .howitworks, .workouttypes, .closing { padding: 60px 24px; }
  .demo-stats { grid-template-columns: repeat(2, 1fr); }
  .how-steps { grid-template-columns: 1fr; }
  .wt-grid { grid-template-columns: 1fr; }
  .closing-headline { font-size: 36px; }
  .footer-inner { flex-direction: column; gap: 16px; text-align: center; }
  .nav { padding: 16px 24px; }
}
@media (max-width: 480px) {
  .hero-headline { font-size: 40px; }
  .zone-number { font-size: 80px; }
  .demo-stats { grid-template-columns: 1fr 1fr; }
}