:root {
  --bg-primary: #0A0A0F;
  --bg-secondary: #111118;
  --bg-card: #16161F;
  --fg-primary: #F0F0F5;
  --fg-secondary: #9898A6;
  --fg-muted: #5C5C6E;
  --accent: #00E599;
  --accent-dim: rgba(0, 229, 153, 0.12);
  --accent-glow: rgba(0, 229, 153, 0.3);
  --border: rgba(255,255,255,0.06);
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

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

body {
  background: var(--bg-primary);
  color: var(--fg-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 80px 40px;
  position: relative;
  background: 
    radial-gradient(ellipse 60% 50% at 70% 50%, rgba(0,229,153,0.06) 0%, transparent 70%),
    var(--bg-primary);
}

.hero-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 80px;
  align-items: center;
  width: 100%;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 6px 16px;
  border-radius: 4px;
  margin-bottom: 24px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 5.5vw, 4.5rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--fg-primary);
  margin-bottom: 24px;
}

.hero h1 .accent {
  color: var(--accent);
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--fg-secondary);
  max-width: 480px;
  line-height: 1.7;
  margin-bottom: 36px;
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.cta-primary {
  display: inline-block;
  background: var(--accent);
  color: #000;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  padding: 14px 28px;
  border-radius: 8px;
  text-decoration: none;
  letter-spacing: -0.01em;
  transition: opacity 0.2s, transform 0.2s;
  box-shadow: 0 0 24px var(--accent-glow);
}

.cta-primary:hover { opacity: 0.88; transform: translateY(-1px); }

.cta-note {
  font-size: 0.82rem;
  color: var(--fg-muted);
}

.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 400px;
}

.signal-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--accent);
  opacity: 0;
  animation: pulse-ring 3s ease-out infinite;
}

.ring-1 { width: 120px; height: 120px; animation-delay: 0s; }
.ring-2 { width: 220px; height: 220px; animation-delay: 1s; }
.ring-3 { width: 320px; height: 320px; animation-delay: 2s; }

@keyframes pulse-ring {
  0% { opacity: 0.5; transform: scale(0.8); }
  100% { opacity: 0; transform: scale(1.3); }
}

.shoe-icon {
  position: relative;
  z-index: 2;
  width: 180px;
  height: 120px;
}

.shoe-icon svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 0 30px var(--accent-glow));
}

.coord-text {
  position: absolute;
  bottom: 40px;
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--fg-muted);
  letter-spacing: 0.08em;
}

/* ===== PROBLEM ===== */
.problem {
  padding: 120px 40px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.problem-inner {
  max-width: 1000px;
  margin: 0 auto;
}

.problem h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 600;
  text-align: center;
  margin-bottom: 60px;
  color: var(--fg-primary);
}

.problem-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 40px;
  align-items: stretch;
  margin-bottom: 60px;
}

.problem-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 36px;
}

.problem-label {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 16px;
}

.problem-card h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--fg-primary);
}

.problem-card p {
  color: var(--fg-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.problem-divider {
  display: flex;
  align-items: center;
  justify-content: center;
}

.problem-divider span {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.problem-answer {
  text-align: center;
  padding: 32px;
  border: 1px solid var(--accent);
  border-radius: 12px;
  background: var(--accent-dim);
}

.problem-answer p {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--fg-primary);
}

.problem-answer strong {
  color: var(--accent);
}

/* ===== FEATURES ===== */
.features {
  padding: 120px 40px;
}

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

.features-header h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 600;
  margin-bottom: 60px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-item {
  padding: 36px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg-secondary);
  transition: border-color 0.3s ease;
}

.feature-item:hover {
  border-color: rgba(0,229,153,0.3);
}

.feature-number {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  opacity: 0.4;
  margin-bottom: 20px;
}

.feature-item h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--fg-primary);
}

.feature-item p {
  color: var(--fg-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* ===== USE CASES ===== */
.usecases {
  padding: 120px 40px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.usecases-inner {
  max-width: 900px;
  margin: 0 auto;
}

.usecases h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 600;
  margin-bottom: 60px;
}

.usecase-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.usecase-item {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 24px;
  padding: 36px 0;
  border-bottom: 1px solid var(--border);
  align-items: start;
}

.usecase-item:last-child {
  border-bottom: none;
}

.usecase-icon {
  font-size: 2rem;
  line-height: 1;
  padding-top: 4px;
}

.usecase-content h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--fg-primary);
}

.usecase-content p {
  color: var(--fg-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ===== CLOSING ===== */
.closing {
  padding: 120px 40px;
  text-align: center;
}

.closing-inner {
  max-width: 800px;
  margin: 0 auto;
}

.closing h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 20px;
}

.closing h2 .accent {
  color: var(--accent);
}

.closing > .closing-inner > p {
  color: var(--fg-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
  max-width: 600px;
  margin: 0 auto 60px;
}

.closing-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.stat-value {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--fg-muted);
  line-height: 1.5;
}

/* ===== FOOTER ===== */
.site-footer {
  padding: 60px 40px;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-inner {
  max-width: 600px;
  margin: 0 auto;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--fg-primary);
  margin-bottom: 8px;
}

.footer-tagline {
  color: var(--fg-muted);
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.footer-contact {
  color: var(--fg-muted);
  font-size: 0.8rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
  .hero-sub { margin: 0 auto; }
  .hero-visual { height: 280px; }
  .problem-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .problem-divider { padding: 10px 0; }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .closing-stats {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

@media (max-width: 600px) {
  .hero { padding: 60px 20px; }
  .problem { padding: 80px 20px; }
  .features { padding: 80px 20px; }
  .usecases { padding: 80px 20px; }
  .closing { padding: 80px 20px; }
  .site-footer { padding: 40px 20px; }
  .usecase-item { grid-template-columns: 48px 1fr; gap: 16px; }
}