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

:root {
  --bg: #000000;
  --bg-2: #0a0a0a;
  --surface: #111111;
  --fg: #f5f5f7;
  --fg-muted: #86868b;
  --accent: #00d4ff;
  --accent-dim: rgba(0, 212, 255, 0.12);
  --border: rgba(245, 245, 247, 0.08);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

html { scroll-behavior: smooth; }

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

/* === NAVIGATION === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 48px;
  height: 56px;
  border-bottom: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.nav-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.3px;
}

.nav-link {
  font-size: 13px;
  font-weight: 400;
  color: var(--fg-muted);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-link:hover { color: var(--fg); }

/* === HERO === */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-bg img {
  width: 100%;
  max-width: 640px;
  height: auto;
  object-fit: contain;
  opacity: 0.6;
  mask-image: radial-gradient(ellipse 70% 70% at center, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at center, black 30%, transparent 80%);
  pointer-events: none;
  user-select: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 760px;
  padding: 0 24px;
}

.hero-headline {
  font-size: clamp(56px, 9vw, 96px);
  font-weight: 700;
  line-height: 1.0;
  letter-spacing: -0.03em;
  color: var(--fg);
  margin-bottom: 20px;
}

.hero-sub {
  font-size: clamp(18px, 2.5vw, 22px);
  font-weight: 400;
  color: var(--fg-muted);
  margin-bottom: 48px;
  line-height: 1.5;
}

.btn-primary {
  display: inline-block;
  padding: 14px 36px;
  font-family: var(--font);
  font-size: 15px;
  font-weight: 500;
  color: var(--bg);
  background: var(--fg);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 980px;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.btn-primary:hover {
  background: rgba(245, 245, 247, 0.9);
  border-color: rgba(245, 245, 247, 0.3);
}

.hero-scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  opacity: 0.4;
}

.hero-scroll-hint span {
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--fg-muted);
}

.hero-scroll-hint .scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--fg-muted), transparent);
  animation: scrollFade 2s ease-in-out infinite;
}

@keyframes scrollFade {
  0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* === SECTIONS (shared) === */
.section {
  padding: 96px 48px;
}

.section-inner {
  max-width: 980px;
  margin: 0 auto;
}

.section-label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-headline {
  font-size: clamp(36px, 5vw, 54px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--fg);
  margin-bottom: 20px;
}

.section-body {
  font-size: 17px;
  font-weight: 400;
  color: var(--fg-muted);
  line-height: 1.7;
  max-width: 560px;
}

.section-headline + .section-body {
  margin-top: 0;
}

/* === PROBLEM === */
.problem {
  border-top: 1px solid var(--border);
}

.problem .section-headline {
  font-size: clamp(40px, 6vw, 64px);
  max-width: 680px;
}

.problem-stat {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 36px;
  padding: 12px 20px;
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 13px;
  color: var(--fg-muted);
}

.problem-stat-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ff375f;
  flex-shrink: 0;
}

.problem-stat strong {
  color: var(--fg);
  font-weight: 600;
}

/* === HOW IT WORKS === */
.how-it-works {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  margin-top: 64px;
}

.step {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.step-num {
  font-size: 48px;
  font-weight: 700;
  color: var(--border);
  line-height: 1;
  letter-spacing: -0.04em;
}

.step-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: -0.01em;
}

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

/* === TECHNOLOGY === */
.technology {
  border-top: 1px solid var(--border);
}

.tech-quote {
  margin-top: 64px;
  padding-left: 28px;
  border-left: 2px solid var(--accent);
}

.tech-quote blockquote {
  font-size: clamp(20px, 2.5vw, 26px);
  font-weight: 400;
  color: var(--fg);
  line-height: 1.55;
  letter-spacing: -0.01em;
}

/* === CTA / PRICING === */
.cta {
  border-top: 1px solid var(--border);
  background: var(--bg-2);
  text-align: center;
}

.cta .section-label { display: block; margin-bottom: 20px; }

.cta-price {
  font-size: clamp(48px, 8vw, 80px);
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 8px;
}

.cta-price span {
  font-size: 20px;
  font-weight: 400;
  color: var(--fg-muted);
  vertical-align: super;
  margin-right: 4px;
}

.cta-sub {
  font-size: 15px;
  color: var(--fg-muted);
  margin-bottom: 40px;
  line-height: 1.6;
}

.cta .btn-primary {
  font-size: 16px;
  padding: 16px 48px;
}

/* === FOOTER === */
.footer {
  padding: 40px 48px;
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: 980px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-logo {
  font-size: 15px;
  font-weight: 700;
  color: var(--fg);
}

.footer-tagline {
  font-size: 12px;
  color: var(--fg-muted);
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .nav { padding: 0 24px; }
  .section { padding: 72px 24px; }
  .steps { grid-template-columns: 1fr; gap: 40px; }
  .step-num { font-size: 36px; }
  .footer { padding: 32px 24px; }
  .footer-inner { flex-direction: column; gap: 12px; text-align: center; }
  .hero-scroll-hint { display: none; }
  .problem-stat { margin-top: 24px; }
  .tech-quote { margin-top: 40px; }
}