:root {
  --bg: #0a0a0f;
  --bg-elevated: #12121a;
  --bg-card: #16161f;
  --fg: #e8e8ed;
  --fg-muted: #8a8a9a;
  --fg-dim: #5a5a6a;
  --accent: #00d4aa;
  --accent-glow: rgba(0, 212, 170, 0.15);
  --accent-subtle: rgba(0, 212, 170, 0.08);
  --border: rgba(255, 255, 255, 0.06);
  --radius: 12px;
  --radius-sm: 8px;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

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

/* === NAV === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 20px 0;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  font-size: 22px;
  color: var(--accent);
}

.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.02em;
}

/* === HERO === */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  max-width: 800px;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(0, 212, 170, 0.25);
  background: var(--accent-subtle);
  padding: 8px 20px;
  border-radius: 100px;
  margin-bottom: 40px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(40px, 7vw, 72px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 28px;
}

.blur-text {
  display: block;
  color: var(--fg-muted);
  filter: blur(2px);
  transition: filter 0.8s ease;
}

.hero:hover .blur-text {
  filter: blur(0);
  color: var(--fg);
}

.clear-text {
  display: block;
  color: var(--accent);
}

.hero-lede {
  font-size: 18px;
  color: var(--fg-muted);
  max-width: 560px;
  margin: 0 auto 48px;
  line-height: 1.7;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-num {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--fg);
}

.stat-label {
  font-size: 13px;
  color: var(--fg-dim);
  max-width: 140px;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* === PROBLEM === */
.problem {
  padding: 120px 24px;
  background: var(--bg-elevated);
}

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

.problem-label,
.how-label,
.devices-label {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.problem-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 700px;
  margin-bottom: 56px;
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.problem-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: border-color 0.3s ease;
}

.problem-card:hover {
  border-color: rgba(0, 212, 170, 0.2);
}

.problem-number {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 20px;
}

.problem-card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.problem-card p {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.65;
}

/* === HOW === */
.how {
  padding: 120px 24px;
}

.how-inner {
  max-width: 700px;
  margin: 0 auto;
}

.how-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 56px;
}

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

.step {
  display: flex;
  gap: 28px;
  padding-bottom: 48px;
}

.step:last-child {
  padding-bottom: 0;
}

.step-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
  width: 20px;
  padding-top: 6px;
}

.step-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
  flex-shrink: 0;
}

.step-line {
  display: none;
}

.step:not(:first-child) .step-line {
  display: block;
  width: 2px;
  height: 48px;
  background: linear-gradient(to bottom, var(--border), var(--accent));
  margin-bottom: 8px;
  position: relative;
  top: -48px;
  margin-top: -48px;
}

.step:not(:first-child) .step-marker {
  padding-top: 0;
}

.step-content h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.step-content p {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.65;
}

/* === DEVICES === */
.devices {
  padding: 120px 24px;
  background: var(--bg-elevated);
}

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

.devices-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 56px;
}

.devices-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.device-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 28px;
  text-align: center;
  position: relative;
  transition: border-color 0.3s ease, transform 0.3s ease;
}

.device-card:hover {
  border-color: rgba(0, 212, 170, 0.2);
  transform: translateY(-4px);
}

.device-card.featured {
  border-color: rgba(0, 212, 170, 0.3);
  background: linear-gradient(180deg, rgba(0, 212, 170, 0.04) 0%, var(--bg-card) 100%);
}

.device-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--bg);
  background: var(--accent);
  padding: 4px 14px;
  border-radius: 100px;
}

.device-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 24px;
  color: var(--accent);
}

.device-icon svg {
  width: 100%;
  height: 100%;
}

.device-card h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.device-card p {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.65;
}

/* === CLOSING === */
.closing {
  padding: 140px 24px;
  text-align: center;
}

.closing-inner {
  max-width: 700px;
  margin: 0 auto;
}

.closing-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4.5vw, 48px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.closing-text {
  font-size: 18px;
  color: var(--fg-muted);
  line-height: 1.7;
  margin-bottom: 48px;
}

.closing-line {
  width: 60px;
  height: 2px;
  background: var(--accent);
  margin: 0 auto 24px;
}

.closing-tagline {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--fg-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* === FOOTER === */
.footer {
  padding: 32px 24px;
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 15px;
  color: var(--fg-muted);
}

.footer-right {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--fg-dim);
}

.footer-sep {
  opacity: 0.3;
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .problem-grid,
  .devices-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .hero-stats {
    flex-direction: column;
    gap: 20px;
  }

  .stat-divider {
    width: 40px;
    height: 1px;
  }

  .stat {
    align-items: center;
    text-align: center;
  }

  .hero {
    padding: 100px 20px 60px;
    min-height: auto;
  }

  .problem,
  .how,
  .devices {
    padding: 80px 20px;
  }

  .closing {
    padding: 100px 20px;
  }

  .device-card.featured {
    order: -1;
  }

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