/* Howard Riker — Reliable by Design
   Dark engineering aesthetic. Amber accent. Inter + JetBrains Mono. */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400&display=swap');

/* ── Design tokens ─────────────────────────────────────────── */
:root {
  --background:        oklch(0.16 0.005 270);
  --foreground:        oklch(0.95 0.005 90);
  --surface:           oklch(0.20 0.006 270);
  --card:              oklch(0.18 0.005 270);
  --card-foreground:   oklch(0.95 0.005 90);
  --primary:           oklch(0.78 0.14 70);
  --primary-foreground:oklch(0.18 0.02 70);
  --secondary:         oklch(0.24 0.006 270);
  --secondary-foreground: oklch(0.95 0.005 90);
  --muted:             oklch(0.22 0.005 270);
  --muted-foreground:  oklch(0.65 0.01 270);
  --border:            oklch(0.28 0.006 270);
  --input:             oklch(0.24 0.006 270);
  --ring:              oklch(0.78 0.14 70);
  --destructive:       oklch(0.62 0.20 25);
  --hairline:          oklch(0.30 0.006 270);
  --radius:            0.375rem;

  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; border-color: var(--border); }

html {
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "cv11";
}

body {
  background-color: var(--background);
  color: var(--foreground);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

::selection {
  background-color: color-mix(in oklab, var(--primary) 30%, transparent);
  color: var(--foreground);
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ── Typography helpers ────────────────────────────────────── */
.font-mono { font-family: var(--font-mono); }
.text-primary { color: var(--primary); }
.text-muted { color: var(--muted-foreground); }

/* ── Layout ────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 72rem; /* max-w-6xl */
  margin-inline: auto;
  padding-inline: 1.5rem;
}
.container-sm {
  width: 100%;
  max-width: 48rem; /* max-w-3xl */
  margin-inline: auto;
  padding-inline: 1.5rem;
}

main { flex: 1; }

/* ── Grid lines (hero background) ─────────────────────────── */
.grid-lines {
  background-image:
    linear-gradient(to right,  var(--hairline) 1px, transparent 1px),
    linear-gradient(to bottom, var(--hairline) 1px, transparent 1px);
  background-size: 64px 64px;
  background-position: -1px -1px;
}

/* ── Header / Nav ──────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--border);
  background-color: color-mix(in oklab, var(--background) 85%, transparent);
  backdrop-filter: blur(8px);
}

.site-header .container {
  height: 3.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: -0.025em;
  transition: color 0.15s;
}
.site-logo:hover { color: var(--primary); }
.site-logo .muted { color: var(--muted-foreground); }

.site-nav { display: flex; align-items: center; gap: 0.25rem; }

.nav-link {
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
  color: var(--muted-foreground);
  border-radius: var(--radius);
  transition: color 0.15s;
}
.nav-link:hover { color: var(--foreground); }
.nav-link.active {
  color: var(--foreground);
  background-color: var(--secondary);
}

.nav-cta {
  margin-left: 0.5rem;
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  background-color: var(--primary);
  color: var(--primary-foreground);
  border-radius: var(--radius);
  transition: opacity 0.15s;
}
.nav-cta:hover { opacity: 0.9; }

/* ── Footer ────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 6rem;
}
.site-footer .container {
  padding-block: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted-foreground);
}
.footer-links {
  display: flex;
  gap: 1.25rem;
  font-size: 0.75rem;
  color: var(--muted-foreground);
}
.footer-links a:hover { color: var(--foreground); }

@media (min-width: 640px) {
  .site-footer .container {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

/* ── Section borders ───────────────────────────────────────── */
.border-b { border-bottom: 1px solid var(--border); }
.border-t { border-top: 1px solid var(--border); }

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  font-size: 1rem;
  font-weight: 500;
  border-radius: calc(var(--radius) - 2px);
  cursor: pointer;
  transition: opacity 0.15s, background-color 0.15s, color 0.15s;
  border: none;
}
.btn-primary {
  background-color: var(--primary);
  color: var(--primary-foreground);
}
.btn-primary:hover { opacity: 0.9; }

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--border);
  color: var(--foreground);
}
.btn-outline:hover { background-color: var(--secondary); }

.btn:disabled { opacity: 0.6; cursor: not-allowed; }

/* ── Hero section ──────────────────────────────────────────── */
.hero {
  position: relative;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  opacity: 0.15;
  pointer-events: none;
}
.hero-inner {
  position: relative;
  padding-top: 6rem;
  padding-bottom: 7rem;
}
@media (min-width: 640px) {
  .hero-inner { padding-top: 8rem; padding-bottom: 9rem; }
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.eyebrow-line {
  display: inline-block;
  width: 2rem;
  height: 1px;
  background-color: var(--primary);
}

.h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.05;
  max-width: 50rem;
}
.h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 600;
  letter-spacing: -0.025em;
}
.h3 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.025em;
}

.subtitle {
  margin-top: 1rem;
  font-size: clamp(1.25rem, 3vw, 1.875rem);
  color: var(--muted-foreground);
  letter-spacing: -0.025em;
  max-width: 48rem;
}
.lead {
  margin-top: 2.5rem;
  font-size: 1.125rem;
  color: var(--muted-foreground);
  max-width: 40rem;
  line-height: 1.7;
}
.cta-row {
  margin-top: 2.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ── Page header (inner pages) ─────────────────────────────── */
.page-header {
  border-bottom: 1px solid var(--border);
  padding-top: 5rem;
  padding-bottom: 4rem;
}
.page-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

/* ── Two-column grid layout ────────────────────────────────── */
.two-col {
  display: grid;
  gap: 3rem;
  padding-block: 5rem;
}
@media (min-width: 768px) {
  .two-col { grid-template-columns: 1fr 2fr; }
}

/* ── Sidebar ───────────────────────────────────────────────── */
.sidebar { display: flex; flex-direction: column; gap: 1.5rem; }
@media (min-width: 768px) {
  .sidebar { position: sticky; top: 6rem; align-self: start; }
}
.sidebar-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted-foreground);
  margin-bottom: 0.5rem;
}

/* ── Prose (body copy) ─────────────────────────────────────── */
.prose { display: flex; flex-direction: column; gap: 1.5rem; }
.prose p {
  font-size: 1.125rem;
  line-height: 1.75;
  color: var(--muted-foreground);
}
.prose p.highlight { color: var(--foreground); }

/* ── Pull quote ────────────────────────────────────────────── */
.pull-quote-section {
  border-bottom: 1px solid var(--border);
  padding-block: 6rem;
}
.pull-quote-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted-foreground);
  margin-bottom: 1.5rem;
}
.pull-quote {
  font-size: clamp(1.25rem, 3vw, 1.875rem);
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: -0.025em;
}

/* ── Feature grid (book page) ──────────────────────────────── */
.feature-grid {
  display: grid;
  gap: 1px;
  background-color: var(--border);
}
@media (min-width: 640px) {
  .feature-grid { grid-template-columns: 1fr 1fr; }
}
.feature-card {
  background-color: var(--background);
  padding: 2rem;
}
.feature-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

/* ── Buy grid ──────────────────────────────────────────────── */
.buy-grid {
  display: grid;
  gap: 0.75rem;
  max-width: 40rem;
}
@media (min-width: 640px) {
  .buy-grid { grid-template-columns: 1fr 1fr; }
}
.buy-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) - 2px);
  background-color: var(--card);
  font-weight: 500;
  transition: border-color 0.15s, color 0.15s;
}
.buy-link:hover { border-color: var(--primary); color: var(--primary); }
.buy-link-arrow { color: var(--muted-foreground); }

/* ── CTA strip ─────────────────────────────────────────────── */
.cta-strip {
  padding-block: 6rem;
}
.cta-strip .container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
@media (min-width: 640px) {
  .cta-strip .container {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }
}

/* ── Contact form ──────────────────────────────────────────── */
.form { display: flex; flex-direction: column; gap: 1.5rem; }
.form-row { display: grid; gap: 1.5rem; }
@media (min-width: 640px) { .form-row { grid-template-columns: 1fr 1fr; } }

.field { display: flex; flex-direction: column; gap: 0.5rem; }
.field label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted-foreground);
}
.field label .required { color: var(--primary); }
.field input, .field textarea {
  width: 100%;
  background-color: var(--input);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) - 2px);
  padding: 0.75rem 1rem;
  color: var(--foreground);
  font-family: var(--font-sans);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.field input:focus, .field textarea:focus {
  border-color: var(--ring);
  box-shadow: 0 0 0 2px color-mix(in oklab, var(--ring) 30%, transparent);
}
.field textarea { resize: vertical; }

.form-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}
.form-note {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted-foreground);
}
.form-error {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--destructive);
}

/* ── Success card ──────────────────────────────────────────── */
.success-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
  background-color: var(--card);
  text-align: center;
}
.success-card .eyebrow {
  justify-content: center;
  margin-bottom: 1rem;
}

/* ── Waitlist box ──────────────────────────────────────────── */
.waitlist-box {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
  background-color: var(--card);
  max-width: 48rem;
}
.waitlist-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted-foreground);
  margin-bottom: 1rem;
}
.waitlist-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.waitlist-input {
  flex: 1;
  min-width: 0;
  background-color: var(--input);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) - 2px);
  padding: 0.75rem 1rem;
  color: var(--foreground);
  font-family: var(--font-sans);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.waitlist-input:focus {
  border-color: var(--ring);
  box-shadow: 0 0 0 2px color-mix(in oklab, var(--ring) 30%, transparent);
}
.waitlist-input::placeholder { color: var(--muted-foreground); }

/* ── 404 page ──────────────────────────────────────────────── */
.not-found {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
  gap: 1.5rem;
}
.not-found-code {
  font-family: var(--font-mono);
  font-size: 6rem;
  font-weight: 600;
  color: var(--primary);
  line-height: 1;
}

/* ── Spacing utilities ─────────────────────────────────────── */
.mt-2  { margin-top: 0.5rem; }
.mt-4  { margin-top: 1rem; }
.mt-6  { margin-top: 1.5rem; }
.mt-8  { margin-top: 2rem; }
.mt-10 { margin-top: 2.5rem; }
.mt-16 { margin-top: 4rem; }
.mb-4  { margin-bottom: 1rem; }
.mb-6  { margin-bottom: 1.5rem; }
.mb-10 { margin-bottom: 2.5rem; }
.py-20 { padding-block: 5rem; }
.py-24 { padding-block: 6rem; }
.text-center { text-align: center; }