/* ===== BASE ===== */
:root {
  --bg: #0A0F1C;
  --surface: #111827;
  --surface2: #1C2537;
  --accent: #B8F537;
  --accent-dim: rgba(184, 245, 55, 0.15);
  --text: #E8EDF5;
  --text-muted: #8A95A8;
  --text-dim: #5A6478;
  --border: rgba(255,255,255,0.08);
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
}

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

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

/* ===== NAV ===== */
.nav {
  padding: 20px 32px;
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 1200px;
  margin: 0 auto;
}
.nav-logo {
  font-family: var(--font-display);
  font-size: 22px;
  color: var(--text);
  letter-spacing: -0.02em;
}
.nav-tagline {
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 8px;
  border: 1px solid var(--border);
  border-radius: 20px;
}

/* ===== HERO ===== */
.hero {
  padding: 100px 32px 80px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(184,245,55,0.07) 0%, transparent 70%);
  pointer-events: none;
}
.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.hero-eyebrow {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}
.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(40px, 5vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 24px;
}
.hero-lede {
  font-size: 18px;
  color: var(--text-muted);
  line-height: 1.65;
  max-width: 460px;
}

/* Metric orbit visual */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.metric-orbit {
  position: relative;
  width: 320px;
  height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.orbit-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--border);
}
.orbit-ring-1 { width: 240px; height: 240px; }
.orbit-ring-2 { width: 180px; height: 180px; border-color: var(--accent-dim); }
.orbit-center {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: #0A0F1C;
  position: relative;
  z-index: 1;
}
.orbit-stat {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
}
.orbit-stat-swim { top: 10px; left: 50%; transform: translateX(-50%); }
.orbit-stat-bike { bottom: 60px; right: 20px; }
.orbit-stat-run { top: 60px; left: 20px; }
.stat-value { font-family: var(--font-display); font-size: 22px; color: var(--text); }
.stat-label { font-size: 10px; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.06em; }

/* ===== SESSION CARD ===== */
.session-section {
  padding: 80px 32px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.session-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 80px;
  align-items: center;
}
.session-badge {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  padding: 4px 10px;
  border-radius: 20px;
  margin-bottom: 20px;
}
.session-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.5vw, 42px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 16px;
}
.session-desc {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.65;
}
.feedback-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  box-shadow: 0 24px 48px rgba(0,0,0,0.4);
}
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}
.card-sport {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}
.card-date { font-size: 12px; color: var(--text-dim); }
.card-summary {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 24px;
}
.card-score {
  font-family: var(--font-display);
  font-size: 48px;
  color: var(--text);
}
.card-score-label { font-size: 14px; color: var(--text-muted); }
.card-metrics { border-top: 1px solid var(--border); padding-top: 16px; margin-bottom: 20px; }
.metric-row {
  display: flex;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  font-size: 13px;
}
.metric-label { width: 80px; color: var(--text-muted); }
.metric-val { flex: 1; color: var(--text); font-weight: 500; }
.metric-delta { font-size: 11px; padding: 2px 7px; border-radius: 10px; }
.metric-delta.up { background: rgba(184,245,55,0.12); color: var(--accent); }
.metric-delta.down { background: rgba(255,80,80,0.12); color: #FF8080; }
.metric-delta.neutral { background: rgba(138,149,168,0.12); color: var(--text-muted); }
.card-insight {
  background: var(--bg);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 16px;
}
.insight-text { font-size: 13px; color: var(--text-muted); line-height: 1.6; }
.card-rec {
  background: var(--accent-dim);
  border-radius: 10px;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.rec-label { font-size: 13px; color: var(--text-muted); }
.rec-badge { font-size: 12px; font-weight: 600; color: var(--accent); background: rgba(184,245,55,0.1); padding: 4px 10px; border-radius: 6px; }

/* ===== HOW IT WORKS ===== */
.how-section { padding: 100px 32px; }
.how-inner { max-width: 1200px; margin: 0 auto; }
.how-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.5vw, 44px);
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 64px;
  text-align: center;
}
.how-steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
}
.step {
  flex: 1;
  padding: 0 40px;
}
.step:first-child { padding-left: 0; }
.step:last-child { padding-right: 0; }
.step-connector {
  width: 48px;
  height: 1px;
  background: var(--border);
  margin-top: 28px;
  flex-shrink: 0;
}
.step-num {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 16px;
}
.step-head {
  font-family: var(--font-display);
  font-size: 22px;
  color: var(--text);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.step-body { font-size: 14px; color: var(--text-muted); line-height: 1.7; }

/* ===== FEATURES ===== */
.features-section { padding: 80px 32px; background: var(--surface); border-top: 1px solid var(--border); }
.features-inner { max-width: 1200px; margin: 0 auto; }
.features-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3vw, 40px);
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 56px;
  text-align: center;
}
.features-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.feature { padding: 8px 0; }
.feature-icon { margin-bottom: 16px; }
.feature-head {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 10px;
}
.feature-body { font-size: 14px; color: var(--text-muted); line-height: 1.7; }

/* ===== THE GAP ===== */
.gap-section { padding: 100px 32px; }
.gap-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 80px;
  align-items: start;
}
.gap-stat { border-right: 1px solid var(--border); padding-right: 80px; }
.gap-number {
  font-family: var(--font-display);
  font-size: 80px;
  color: var(--accent);
  display: block;
  line-height: 1;
  margin-bottom: 16px;
}
.gap-desc { font-size: 15px; color: var(--text-muted); line-height: 1.65; }
.gap-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3vw, 40px);
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 24px;
}
.gap-text { font-size: 16px; color: var(--text-muted); line-height: 1.75; margin-bottom: 16px; }

/* ===== CLOSING ===== */
.closing-section {
  padding: 120px 32px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  text-align: center;
}
.closing-inner { max-width: 700px; margin: 0 auto; }
.closing-headline {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 28px;
}
.closing-sub {
  font-size: 18px;
  color: var(--text-muted);
  line-height: 1.65;
  max-width: 520px;
  margin: 0 auto;
}

/* ===== FOOTER ===== */
.footer {
  padding: 32px;
  border-top: 1px solid var(--border);
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.footer-logo {
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--text);
}
.footer-sub { font-size: 13px; color: var(--text-dim); }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hero-inner,
  .session-inner,
  .gap-inner { grid-template-columns: 1fr; gap: 48px; }
  .gap-stat { border-right: none; border-bottom: 1px solid var(--border); padding-right: 0; padding-bottom: 48px; }
  .how-steps { flex-direction: column; }
  .step { padding: 0 0 48px; }
  .step-connector { display: none; }
  .features-grid { grid-template-columns: 1fr; }
  .orbit-stat-bike { right: 0; }
  .orbit-stat-run { left: 0; }
  .nav { padding: 16px 20px; }
  .hero { padding: 64px 20px 56px; }
  .session-section, .how-section, .gap-section, .closing-section { padding: 64px 20px; }
  .footer-inner { flex-direction: column; gap: 8px; text-align: center; }
}