:root {
  --bg: #0f0f16;
  --bg-card: #16161f;
  --bg-card-hover: #1d1d28;
  --fg: #f0ede6;
  --fg-muted: #8a8897;
  --fg-faint: #4a4858;
  --accent: #f59e0b;
  --accent-dim: rgba(245,158,11,0.12);
  --border: rgba(240,237,230,0.06);
  --stripe: #635BFF;
}

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

html {
  scroll-behavior: smooth;
}

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

/* Nav */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border);
  background: rgba(15,15,22,0.85);
  backdrop-filter: blur(12px);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 18px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 18px;
  color: var(--fg);
  letter-spacing: -0.02em;
}

.nav-logo-mark {
  color: var(--accent);
  font-size: 20px;
}

.nav-tagline {
  font-size: 12px;
  color: var(--fg-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 500;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 120px 32px 80px;
}

.hero-bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
}

.hero-bg-orb-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(245,158,11,0.06) 0%, transparent 70%);
  top: -100px;
  right: -100px;
}

.hero-bg-orb-2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(99,91,255,0.05) 0%, transparent 70%);
  bottom: 0;
  left: -150px;
}

.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
  position: relative;
  z-index: 1;
}

.hero-stat-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(245,158,11,0.25);
  padding: 5px 12px;
  border-radius: 100px;
  margin-bottom: 36px;
}

.hero-headline {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: clamp(52px, 7.5vw, 96px);
  line-height: 1.0;
  letter-spacing: -0.03em;
  color: var(--fg);
  margin-bottom: 32px;
  max-width: 720px;
}

.hero-headline br { display: block; }

.hero-sub {
  font-size: clamp(17px, 2vw, 20px);
  color: var(--fg-muted);
  max-width: 560px;
  line-height: 1.7;
  margin-bottom: 60px;
}

.hero-proof {
  display: flex;
  align-items: center;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--bg-card);
  overflow: hidden;
  width: fit-content;
}

.hero-proof-item {
  padding: 24px 36px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.hero-proof-number {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 32px;
  color: var(--accent);
  line-height: 1;
}

.hero-proof-label {
  font-size: 13px;
  color: var(--fg-muted);
  max-width: 120px;
}

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

/* Problem */
.problem {
  padding: 120px 32px;
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.problem-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.problem-label, .how-label, .loop-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}

.problem-headline {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: clamp(32px, 4vw, 52px);
  letter-spacing: -0.02em;
  color: var(--fg);
  margin-bottom: 64px;
  max-width: 600px;
  line-height: 1.15;
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
}

.problem-card {
  background: var(--bg-card);
  padding: 40px;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.problem-card:nth-child(even) { border-right: none; }
.problem-card:nth-child(3),
.problem-card:nth-child(4) { border-bottom: none; }

.problem-card-icon {
  width: 44px;
  height: 44px;
  background: var(--accent-dim);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-bottom: 20px;
}

.problem-card h3 {
  font-family: 'Syne', sans-serif;
  font-weight: 600;
  font-size: 17px;
  color: var(--fg);
  margin-bottom: 10px;
}

.problem-card p {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.6;
}

/* How it works */
.how {
  padding: 120px 32px;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  position: relative;
}

.how::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.3;
}

.how-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.how-headline {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: clamp(28px, 3.5vw, 44px);
  letter-spacing: -0.02em;
  color: var(--fg);
  margin-bottom: 72px;
  max-width: 600px;
  line-height: 1.2;
}

.how-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.how-step {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 40px;
  padding: 48px 0;
  border-bottom: 1px solid var(--border);
  align-items: start;
}

.how-step:last-child { border-bottom: none; }

.how-step-num {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 48px;
  color: var(--fg-faint);
  line-height: 1;
  padding-top: 4px;
}

.how-step-body h3 {
  font-family: 'Syne', sans-serif;
  font-weight: 600;
  font-size: 22px;
  color: var(--fg);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.how-step-body p {
  font-size: 16px;
  color: var(--fg-muted);
  line-height: 1.7;
  max-width: 520px;
}

/* Loop */
.loop {
  padding: 120px 32px;
  border-top: 1px solid var(--border);
}

.loop-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.loop-headline {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: clamp(28px, 3.5vw, 48px);
  letter-spacing: -0.02em;
  color: var(--fg);
  margin-bottom: 20px;
  max-width: 640px;
  line-height: 1.2;
}

.loop-sub {
  font-size: 17px;
  color: var(--fg-muted);
  max-width: 540px;
  line-height: 1.7;
  margin-bottom: 64px;
}

.loop-diagram {
  display: flex;
  align-items: center;
  gap: 0;
  flex-wrap: wrap;
  row-gap: 16px;
}

.loop-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 32px;
  min-width: 120px;
  text-align: center;
}

.loop-node-icon {
  margin-bottom: 4px;
}

.loop-node span {
  font-family: 'Syne', sans-serif;
  font-weight: 600;
  font-size: 15px;
  color: var(--fg);
}

.loop-node-sub {
  font-size: 12px;
  color: var(--fg-muted);
}

.loop-arrow {
  display: flex;
  align-items: center;
  padding: 0 8px;
}

/* Closing */
.closing {
  padding: 140px 32px;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
  position: relative;
  overflow: hidden;
}

.closing::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(245,158,11,0.05) 0%, transparent 70%);
  pointer-events: none;
}

.closing-inner {
  max-width: 1100px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
  text-align: center;
}

.closing-headline {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: clamp(28px, 4vw, 56px);
  letter-spacing: -0.025em;
  color: var(--fg);
  margin-bottom: 24px;
  line-height: 1.15;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.closing-sub {
  font-size: 18px;
  color: var(--fg-muted);
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 32px;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 15px;
  color: var(--fg-muted);
}

.footer-logo-mark { color: var(--accent); }

.footer-tagline {
  font-size: 13px;
  color: var(--fg-faint);
}

/* Responsive */
@media (max-width: 768px) {
  .hero { padding: 100px 24px 60px; }
  .problem, .how, .loop, .closing { padding: 80px 24px; }
  .nav-inner { padding: 16px 24px; }
  .nav-tagline { display: none; }

  .hero-headline { font-size: 44px; }
  .hero-proof { flex-direction: column; width: 100%; }
  .hero-proof-divider { width: 100%; height: 1px; }
  .hero-proof-item { padding: 20px 24px; }
  .hero-proof-number { font-size: 26px; }

  .problem-grid { grid-template-columns: 1fr; }
  .problem-card { border-right: none; border-bottom: 1px solid var(--border); }
  .problem-card:nth-child(3) { border-bottom: 1px solid var(--border); }
  .problem-card:nth-child(4) { border-bottom: none; }

  .how-step { grid-template-columns: 48px 1fr; gap: 24px; }
  .how-step-num { font-size: 32px; }

  .loop-diagram { flex-direction: column; align-items: stretch; }
  .loop-node { min-width: unset; }
  .loop-arrow { display: none; }

  .footer-inner { flex-direction: column; gap: 12px; text-align: center; }
}

@media (max-width: 480px) {
  .hero-headline { font-size: 38px; }
  .problem-headline { font-size: 28px; }
  .how-headline { font-size: 26px; }
  .closing-headline { font-size: 26px; }
  .problem-card { padding: 28px; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--fg-faint); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--fg-muted); }

/* Selection */
::selection { background: rgba(245,158,11,0.25); color: var(--fg); }