:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #16161f;
  --bg-terminal: #0d0d14;
  --text-primary: #e8e6e3;
  --text-secondary: #8a8a9a;
  --text-muted: #5a5a6a;
  --accent: #00d4ff;
  --accent-dim: #00d4ff22;
  --accent-glow: #00d4ff15;
  --warning: #ff6b35;
  --success: #00e878;
  --confidence: #a78bfa;
  --border: #1e1e2e;
  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

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

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 24px 60px;
  overflow: hidden;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--accent-glow) 1px, transparent 1px),
    linear-gradient(90deg, var(--accent-glow) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 50% at 50% 40%, black 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 70% 50% at 50% 40%, black 20%, transparent 70%);
  opacity: 0.6;
}

.hero-content {
  position: relative;
  max-width: 800px;
  text-align: center;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  background: var(--accent-glow);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 32px;
  text-transform: uppercase;
}

.hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

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

.lede {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 20px;
  justify-content: center;
  margin-top: 36px;
  flex-wrap: wrap;
}

.hero-cta {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  color: var(--bg-primary);
  background: var(--accent);
  padding: 12px 28px;
  border-radius: 10px;
  text-decoration: none;
  transition: all 0.2s;
  letter-spacing: -0.01em;
}

.hero-cta:hover {
  background: #33ddff;
  box-shadow: 0 0 32px rgba(0, 212, 255, 0.35);
  transform: translateY(-2px);
}

.hero-cta-sub {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

/* ===== TERMINAL MOCK ===== */
.hero-terminal {
  position: relative;
  z-index: 1;
  margin-top: 56px;
  width: 100%;
  max-width: 680px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 24px 80px -12px rgba(0, 212, 255, 0.08);
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.terminal-dot.red { background: #ff5f57; }
.terminal-dot.yellow { background: #ffbd2e; }
.terminal-dot.green { background: #28c840; }

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: 8px;
}

.terminal-body {
  background: var(--bg-terminal);
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 2;
}

.trace-line {
  color: var(--text-secondary);
}

.trace-label {
  display: inline-block;
  font-weight: 500;
  min-width: 100px;
  color: var(--accent);
}

.trace-label.confidence {
  color: var(--confidence);
}

.trace-label.suggestion {
  color: var(--success);
}

/* ===== PROBLEM ===== */
.problem {
  padding: 120px 24px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.problem-content {
  max-width: 960px;
  margin: 0 auto;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 48px;
  line-height: 1.2;
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.problem-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px 24px;
  text-align: center;
}

.problem-stat {
  font-family: var(--font-heading);
  font-size: 3.2rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 12px;
}

.problem-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

.problem-summary {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 720px;
  line-height: 1.7;
}

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

.how-content {
  max-width: 960px;
  margin: 0 auto;
}

.how-steps {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.step {
  display: flex;
  gap: 32px;
  align-items: flex-start;
}

.step-number {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 700;
  color: var(--accent-dim);
  line-height: 1;
  min-width: 80px;
  background: linear-gradient(180deg, var(--accent) 0%, var(--accent-dim) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.step-detail h4 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.step-detail p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
  max-width: 600px;
}

/* ===== FEATURES ===== */
.features {
  padding: 120px 24px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.features-content {
  max-width: 960px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  transition: border-color 0.2s;
}

.feature-card:hover {
  border-color: var(--accent-dim);
}

.feature-icon {
  font-size: 1.6rem;
  margin-bottom: 16px;
  color: var(--accent);
}

.feature-card h4 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

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

.closing::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.closing-content {
  position: relative;
  z-index: 1;
  max-width: 700px;
  margin: 0 auto;
}

.closing-headline {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  line-height: 1.15;
}

.closing-text {
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1.7;
  margin-bottom: 40px;
}

.closing-tagline {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

/* ===== FOOTER ===== */
.site-footer {
  padding: 40px 24px;
  border-top: 1px solid var(--border);
}

.footer-content {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-muted);
}

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

  .features-grid {
    grid-template-columns: 1fr;
  }

  .step {
    flex-direction: column;
    gap: 12px;
  }

  .step-number {
    font-size: 2rem;
    min-width: auto;
  }

  .hero-terminal {
    margin-top: 40px;
  }

  .terminal-body {
    font-size: 0.72rem;
    padding: 16px;
  }

  .trace-label {
    min-width: 80px;
  }

  .hero {
    padding: 60px 20px 40px;
  }

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

  .closing {
    padding: 100px 20px;
  }

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

@media (max-width: 480px) {
  .terminal-body {
    font-size: 0.65rem;
  }

  .trace-label {
    min-width: 70px;
    font-size: 0.6rem;
  }
}