/* DocStack — grounded, technical, AEC-native */
:root {
  --bg: #F7F4EF;
  --surface: #FFFFFF;
  --fg: #1A1814;
  --fg-muted: #5C5650;
  --accent: #B85C38;
  --accent-dark: #8C4428;
  --border: #DDD8CF;
  --tag-bg: #EDE9E1;
  --code-bg: #2A2520;
  --code-fg: #E8E0D5;
  --mono: 'IBM Plex Mono', monospace;
  --sans: 'IBM Plex Sans', system-ui, sans-serif;
}

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

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ── Navbar ─────────────────────────────────── */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.125rem 2rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav-brand { display: flex; align-items: center; }

.brand-mono {
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.02em;
}

.nav-tagline {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--fg-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ── Hero ───────────────────────────────────── */
.hero {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 5rem 2rem 4rem;
}

.hero-inner { max-width: 860px; margin: 0 auto; }

.hero-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
}

.hero-headline {
  font-family: var(--mono);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.03em;
  color: var(--fg);
  margin-bottom: 1.5rem;
}

.hero-sub {
  font-size: 1.125rem;
  color: var(--fg-muted);
  max-width: 580px;
  line-height: 1.7;
  margin-bottom: 3rem;
}

.hero-workflow {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.wf-step {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--tag-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.6rem 1rem;
}

.wf-icon { color: var(--accent); display: flex; align-items: center; }

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

.wf-label code {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--fg);
}

.wf-arrow { color: var(--fg-muted); display: flex; align-items: center; }

/* ── How It Works ───────────────────────────── */
.how-it-works {
  padding: 5rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

.section-header { margin-bottom: 3rem; }

.section-eyebrow {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 0.75rem;
}

.section-header h2 {
  font-family: var(--mono);
  font-size: clamp(1.6rem, 3.5vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.2;
  color: var(--fg);
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-bottom: 3.5rem;
}

.problem-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem 1.75rem;
}

.problem-stat {
  font-family: var(--mono);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.problem-desc {
  font-size: 0.875rem;
  color: var(--fg-muted);
  line-height: 1.55;
}

.how-solution h3 {
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin-bottom: 1rem;
}

.how-solution p {
  font-size: 1rem;
  color: var(--fg-muted);
  line-height: 1.75;
  margin-bottom: 1rem;
  max-width: 700px;
}

.how-solution code {
  font-family: var(--mono);
  font-size: 0.875em;
  background: var(--tag-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.15em 0.45em;
  color: var(--fg);
}

/* ── What You Get ───────────────────────────── */
.what-you-get {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 5rem 2rem;
}

.what-you-get .section-header { max-width: 1100px; margin: 0 auto 3rem; }

.kit-features {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.kit-feature {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  padding: 1.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.kit-icon {
  width: 36px;
  height: 36px;
  background: var(--accent);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: #fff;
}

.kit-feature h4 {
  font-family: var(--mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 0.4rem;
  letter-spacing: -0.01em;
}

.kit-feature p {
  font-size: 0.875rem;
  color: var(--fg-muted);
  line-height: 1.6;
}

.kit-feature code {
  font-family: var(--mono);
  font-size: 0.82em;
  background: var(--tag-bg);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.1em 0.35em;
  color: var(--fg);
}

/* ── Closing ────────────────────────────────── */
.closing {
  padding: 5rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

.closing-inner { max-width: 620px; }

.closing-badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(184,92,56,0.1);
  border: 1px solid rgba(184,92,56,0.25);
  border-radius: 4px;
  padding: 0.3em 0.75em;
  margin-bottom: 1.25rem;
}

.closing h2 {
  font-family: var(--mono);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.25;
  color: var(--fg);
  margin-bottom: 1.25rem;
}

.closing p {
  font-size: 1rem;
  color: var(--fg-muted);
  line-height: 1.75;
  margin-bottom: 1rem;
}

.closing-note {
  font-size: 0.925rem;
  color: var(--fg);
  font-weight: 500;
  margin-top: 1rem;
}

.closing-rule {
  width: 48px;
  height: 2px;
  background: var(--accent);
  margin-top: 2.5rem;
}

/* ── Footer ─────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 2rem;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-name {
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--fg);
}

.footer-tagline {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--fg-muted);
  margin-left: 0.75rem;
  letter-spacing: 0.03em;
}

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

/* ── Responsive ──────────────────────────────── */
@media (max-width: 640px) {
  .navbar { padding: 1rem 1.25rem; }
  .hero { padding: 3rem 1.25rem 2.5rem; }
  .hero-headline { font-size: 1.75rem; }
  .hero-workflow { gap: 0.5rem; }
  .wf-label { font-size: 0.72rem; }
  .how-it-works { padding: 3rem 1.25rem; }
  .what-you-get { padding: 3rem 1.25rem; }
  .kit-features { grid-template-columns: 1fr; }
  .closing { padding: 3rem 1.25rem; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 400px) {
  .hero-workflow { flex-direction: column; align-items: flex-start; }
  .wf-arrow { display: none; }
}