:root {
  --bg: #0a0a0a;
  --bg-surface: #141414;
  --bg-card: #1c1c1c;
  --fg: #f5f5f0;
  --fg-muted: #8a8a8a;
  --accent: #F59E0B;
  --accent-dim: rgba(245, 158, 11, 0.12);
  --border: rgba(255, 255, 255, 0.08);
  --font-body: 'Instrument Sans', system-ui, sans-serif;
  --font-display: 'Instrument Serif', Georgia, serif;
}

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

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

/* NAV */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border);
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(12px);
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.02em;
  color: var(--fg);
}
.nav-tag {
  font-size: 13px;
  color: var(--fg-muted);
  letter-spacing: 0.02em;
}

/* HERO */
.hero {
  max-width: 1100px;
  margin: 0 auto;
  padding: 80px 32px 64px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  margin-bottom: 56px;
}
.hero-eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}
.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin-bottom: 20px;
}
.hero-lede {
  font-size: 17px;
  color: var(--fg-muted);
  line-height: 1.7;
  max-width: 440px;
}

/* Flow Diagram */
.hero-diagram {
  display: flex;
  flex-direction: column;
  gap: 0;
  align-items: flex-start;
}
.flow-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  max-width: 320px;
  position: relative;
}
.flow-card + .flow-card {
  margin-top: 0;
}
.flow-icon {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: var(--accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}
.flow-icon.ai-icon { background: rgba(34, 197, 94, 0.12); color: #22c55e; }
.flow-icon.book-icon { background: rgba(99, 102, 241, 0.12); color: #6366f1; }
.flow-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--fg);
}
.flow-time, .flow-detail {
  font-size: 12px;
  color: var(--fg-muted);
}
.flow-arrow {
  margin: 4px 0 4px 22px;
  opacity: 0.6;
}

.hero-proof {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.proof-stat {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
}
.proof-sep {
  color: var(--border);
  font-size: 18px;
}
.proof-text {
  font-size: 14px;
  color: var(--fg-muted);
}

/* SHARED SECTION STYLES */
.section-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.section-headline {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.5vw, 42px);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin-bottom: 48px;
}

/* PROBLEM */
.problem {
  border-top: 1px solid var(--border);
  background: var(--bg-surface);
}
.problem-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 80px 32px;
}
.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.problem-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 28px 28px 32px;
}
.problem-icon {
  width: 44px;
  height: 44px;
  background: var(--accent-dim);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-bottom: 18px;
}
.problem-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 8px;
}
.problem-desc {
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.6;
}

/* HOW */
.how {
  border-top: 1px solid var(--border);
}
.how-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 80px 32px;
}
.how-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 48px;
}
.step {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}
.step:first-child { border-top: 1px solid var(--border); }
.step-num {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
  font-family: var(--font-body);
  min-width: 28px;
  margin-top: 4px;
}
.step-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 6px;
}
.step-desc {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.6;
}
.how-tools {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.tools-label {
  font-size: 12px;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.tools-list {
  display: flex;
  gap: 10px;
}
.tool-tag {
  font-size: 12px;
  font-weight: 500;
  background: var(--accent-dim);
  color: var(--accent);
  padding: 5px 12px;
  border-radius: 20px;
  letter-spacing: 0.02em;
}

/* OUTCOMES */
.outcomes {
  border-top: 1px solid var(--border);
  background: var(--bg-surface);
}
.outcomes-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 80px 32px;
}
.outcomes-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 56px;
}
.outcome-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 32px 28px;
}
.outcome-stat {
  display: block;
  font-family: var(--font-display);
  font-size: 44px;
  font-weight: 400;
  color: var(--fg);
  line-height: 1;
  margin-bottom: 6px;
}
.outcome-unit {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.outcome-note {
  font-size: 13px;
  color: var(--fg-muted);
}
.outcomes-model {
  background: var(--accent-dim);
  border: 1px solid rgba(245, 158, 11, 0.2);
  border-radius: 10px;
  padding: 28px 32px;
}
.model-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 10px;
}
.model-text {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* CLOSING */
.closing {
  border-top: 1px solid var(--border);
}
.closing-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 96px 32px;
  max-width: 760px;
}
.closing-headline {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.5vw, 48px);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin-bottom: 28px;
}
.closing-body {
  font-size: 17px;
  color: var(--fg-muted);
  line-height: 1.75;
  margin-bottom: 20px;
}
.closing-tagline {
  font-size: 16px;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.01em;
}

/* FOOTER */
.footer {
  border-top: 1px solid var(--border);
  padding: 64px 0 40px;
}
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 32px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-logo {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  display: block;
  margin-bottom: 12px;
}
.footer-desc {
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.6;
  max-width: 320px;
}
.footer-note {
  font-size: 13px;
  color: var(--fg-muted);
  line-height: 1.6;
}
.footer-bottom {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 32px 0;
  border-top: 1px solid var(--border);
}
.footer-bottom p {
  font-size: 12px;
  color: #444;
}

/* CALCULATOR */
.calc {
  border-top: 1px solid var(--border);
  background: var(--bg-surface);
}
.calc-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 80px 32px;
}
.calc-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 40px 40px;
  margin-top: 16px;
}

/* Inputs column */
.calc-inputs {
  display: flex;
  flex-direction: column;
  gap: 32px;
}
.calc-field-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}
.calc-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--fg);
}
.calc-val {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  min-width: 56px;
  text-align: right;
}
.calc-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: rgba(255,255,255,0.08);
  outline: none;
  cursor: pointer;
  /* Thumb */
}
.calc-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 0 4px rgba(245,158,11,0.2);
  transition: box-shadow 0.15s;
}
.calc-slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 0 4px rgba(245,158,11,0.2);
}
.calc-slider:focus::-webkit-slider-thumb {
  box-shadow: 0 0 0 6px rgba(245,158,11,0.3);
}
.calc-slider:focus {
  outline: none;
}
.calc-range-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  font-size: 11px;
  color: var(--fg-muted);
}

/* Output column */
.calc-output {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.calc-result-block {
  background: rgba(245,158,11,0.06);
  border: 1px solid rgba(245,158,11,0.15);
  border-radius: 10px;
  padding: 24px 24px 20px;
}
.calc-result-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 4px;
}
.calc-result-number {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 58px);
  font-weight: 400;
  color: var(--fg);
  line-height: 1;
  margin-bottom: 4px;
  letter-spacing: -0.02em;
  /* pop it */
  background: linear-gradient(135deg, #fff 0%, #F59E0B 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.calc-result-period {
  font-size: 13px;
  color: var(--fg-muted);
  margin-bottom: 14px;
}
.calc-tooltip-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  font-size: 12px;
  color: var(--fg-muted);
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 3px;
  font-family: var(--font-body);
}
.calc-tooltip-btn:hover { color: var(--fg); }
.calc-tooltip {
  margin-top: 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 12px 14px;
  font-size: 13px;
  color: var(--fg-muted);
  line-height: 1.6;
}
.calc-tooltip strong { color: var(--fg); }

.calc-recovery-block {
  background: rgba(99,102,241,0.08);
  border: 1px solid rgba(99,102,241,0.15);
  border-radius: 10px;
  padding: 20px 24px;
}
.calc-recovery-label {
  font-size: 13px;
  color: var(--fg-muted);
  margin-bottom: 8px;
}
.calc-recovery-label strong { color: var(--fg); }
.calc-recovery-range {
  display: flex;
  align-items: baseline;
  gap: 4px;
  flex-wrap: wrap;
}
.calc-recovery-low,
.calc-recovery-high {
  font-size: 26px;
  font-weight: 700;
  color: #6366f1;
  font-family: var(--font-display);
}
.calc-recovery-sep {
  font-size: 22px;
  color: var(--fg-muted);
}
.calc-recovery-unit {
  font-size: 13px;
  color: var(--fg-muted);
  margin-left: 4px;
}

.calc-cta-btn {
  display: inline-block;
  background: var(--accent);
  color: #0a0a0a;
  font-weight: 700;
  font-size: 15px;
  padding: 14px 24px;
  border-radius: 8px;
  text-decoration: none;
  text-align: center;
  transition: opacity 0.15s;
  width: 100%;
  box-sizing: border-box;
}
.calc-cta-btn:hover { opacity: 0.88; }

.calc-email-capture {
  border-top: 1px solid var(--border);
  padding-top: 18px;
}
.calc-email-label {
  font-size: 13px;
  color: var(--fg-muted);
  margin-bottom: 10px;
}
.calc-email-form {
  display: flex;
  gap: 8px;
}
.calc-email-input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 10px 14px;
  font-size: 14px;
  color: var(--fg);
  font-family: var(--font-body);
  min-width: 0;
}
.calc-email-input::placeholder { color: var(--fg-muted); }
.calc-email-input:focus {
  outline: none;
  border-color: var(--accent);
}
.calc-email-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--fg);
  cursor: pointer;
  font-family: var(--font-body);
  white-space: nowrap;
  transition: border-color 0.15s, color 0.15s;
}
.calc-email-btn:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
}
.calc-email-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.calc-email-success {
  font-size: 13px;
  color: #22c55e;
  margin-top: 8px;
}
.calc-email-error {
  font-size: 13px;
  color: #ef4444;
  margin-top: 8px;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-diagram { display: none; }
  .problem-grid { grid-template-columns: 1fr; }
  .outcomes-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .hero { padding: 56px 24px 48px; }
  .problem-inner, .how-inner, .outcomes-inner, .closing-inner { padding: 64px 24px; }
  .hero-proof { flex-direction: column; align-items: flex-start; gap: 8px; }
  .proof-sep { display: none; }
  .nav-inner { padding: 14px 24px; }

  /* Calculator */
  .calc-inner { padding: 64px 24px; }
  .calc-card { grid-template-columns: 1fr; gap: 32px; padding: 28px 20px; }
  .calc-email-form { flex-direction: column; }
  .calc-result-number { font-size: 44px; }
}