:root {
  --bg: #0d0d1a;
  --bg-surface: #14142a;
  --bg-elevated: #1a1a35;
  --fg: #e8e8f0;
  --fg-muted: #8a8ab0;
  --fg-dim: #5a5a7a;
  --accent: #ff6b35;
  --accent-dim: #cc5629;
  --border: #2d2d4a;
  --font-display: 'Barlow', sans-serif;
  --font-body: 'Source Sans 3', sans-serif;
}

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

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

/* --- NAV --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 32px;
  background: rgba(13, 13, 26, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav-logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  color: var(--fg);
  letter-spacing: -0.02em;
}
.nav-tagline {
  font-size: 13px;
  color: var(--fg-muted);
  font-weight: 500;
}

/* --- SECTION COMMONS --- */
.section-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}
.section-label {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}
.section-headline {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin-bottom: 48px;
}

/* --- HERO --- */
.hero {
  min-height: 100vh;
  padding: 120px 32px 80px;
  position: relative;
  display: flex;
  align-items: center;
}
.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(45,45,74,0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(45,45,74,0.3) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 0%, transparent 100%);
  pointer-events: none;
}
.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  position: relative;
}
.hero-eyebrow {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}
.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(44px, 6vw, 72px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--fg);
  margin-bottom: 28px;
}
.hero-lede {
  font-size: 18px;
  color: var(--fg-muted);
  line-height: 1.7;
  max-width: 480px;
}

/* --- UI PANEL (Hero Visual) --- */
.ui-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 32px 80px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,107,53,0.08);
}
.ui-panel-header {
  background: var(--bg-elevated);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}
.ui-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
}
.ui-title {
  font-family: 'Courier New', monospace;
  font-size: 12px;
  color: var(--fg-muted);
  margin-left: 8px;
}
.ui-drawing-area {
  padding: 16px;
  background: #0a0a18;
  border-bottom: 1px solid var(--border);
}
.iso-drawing { width: 100%; height: auto; }
.ui-results {
  padding: 16px;
}
.ui-results-header {
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.05em;
  margin-bottom: 12px;
  font-family: var(--font-display);
}
.ui-result-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 16px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  color: var(--fg-muted);
  font-family: 'Courier New', monospace;
  align-items: center;
}
.ui-result-row:last-child { border-bottom: none; }
.ui-total {
  padding-top: 12px;
  color: var(--fg);
  font-weight: 600;
}
.ui-grand {
  padding-top: 12px;
  color: var(--accent);
  font-weight: 800;
  font-size: 15px;
}
.ui-cost { color: var(--fg); text-align: right; }

/* --- HOW IT WORKS --- */
.howitworks {
  padding: 100px 0;
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
}
.steps {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 0;
  align-items: start;
}
.step-number {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 800;
  color: var(--border);
  letter-spacing: -0.04em;
  display: block;
  margin-bottom: 16px;
}
.step-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 12px;
}
.step-body {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.65;
}
.step-divider {
  width: 1px;
  height: 120px;
  background: var(--border);
  margin: 48px 48px 0;
}

/* --- FEATURES --- */
.features {
  padding: 100px 0;
  border-top: 1px solid var(--border);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.feature {
  padding: 28px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: border-color 0.2s;
}
.feature:hover { border-color: var(--accent-dim); }
.feature-icon {
  margin-bottom: 20px;
}
.feature-title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 10px;
}
.feature-body {
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.6;
}

/* --- WHO IT'S FOR --- */
.whoitsfor {
  padding: 100px 0;
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
}
.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
.audience-item {
  padding: 32px;
  background: var(--bg);
}
.audience-title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 12px;
}
.audience-item p {
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.65;
}

/* --- CLOSING --- */
.closing {
  padding: 120px 0;
  text-align: center;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-elevated) 100%);
  border-top: 1px solid var(--border);
}
.closing-tagline {
  font-family: var(--font-display);
  font-size: clamp(18px, 3vw, 26px);
  font-weight: 600;
  color: var(--fg-muted);
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}
.closing-headline {
  font-family: var(--font-display);
  font-size: clamp(40px, 7vw, 80px);
  font-weight: 800;
  color: var(--fg);
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 24px;
}
.closing-body {
  font-size: 17px;
  color: var(--fg-muted);
  max-width: 480px;
  margin: 0 auto;
}

/* --- FOOTER --- */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--border);
  background: var(--bg-surface);
}
.footer-logo {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  color: var(--fg);
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.footer-sub {
  font-size: 14px;
  color: var(--fg-muted);
  margin-bottom: 24px;
}
.footer-copy {
  font-size: 12px;
  color: var(--fg-dim);
}

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .hero-headline { font-size: 42px; }
  .steps {
    grid-template-columns: 1fr;
  }
  .step-divider { display: none; }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .audience-grid {
    grid-template-columns: 1fr;
  }
  .hero { padding: 100px 20px 60px; }
}