/* PocketKnife Apps Inc. — site styles
   Dependency-free, responsive, light/dark aware. */

/* ---------- Design tokens ---------- */
:root {
  --bg: #fbfbf9;
  --surface: #ffffff;
  --surface-2: #f4f4f1;
  --ink: #18181b;
  --ink-soft: #3f3f46;
  --muted: #6b6b74;
  --line: #e6e6e1;
  --line-strong: #d8d8d2;
  --accent: #d83a2f;
  --accent-strong: #b42b22;
  --accent-tint: #fdeceb;
  --on-accent: #ffffff;

  --radius: 14px;
  --radius-sm: 10px;
  --container: 1080px;
  --shadow-sm: 0 1px 2px rgba(24, 24, 27, 0.05);
  --shadow: 0 12px 32px -12px rgba(24, 24, 27, 0.18);

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, "Helvetica Neue", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e0e10;
    --surface: #161618;
    --surface-2: #1d1d20;
    --ink: #f4f4f5;
    --ink-soft: #d4d4d8;
    --muted: #9a9aa3;
    --line: #2a2a2e;
    --line-strong: #3a3a40;
    --accent: #ff5a4d;
    --accent-strong: #ff7a6f;
    --accent-tint: #2a1715;
    --on-accent: #1a0d0c;
    --shadow: 0 16px 40px -16px rgba(0, 0, 0, 0.6);
  }
}

/* ---------- Reset / base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1,
h2,
h3 {
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0 0 0.5em;
  font-weight: 700;
}

h1 {
  font-size: clamp(2.1rem, 1.4rem + 3vw, 3.4rem);
}

h2 {
  font-size: clamp(1.5rem, 1.1rem + 1.4vw, 2rem);
}

h3 {
  font-size: 1.18rem;
}

p {
  margin: 0 0 1.1em;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--on-accent);
  padding: 10px 16px;
  border-radius: 0 0 var(--radius-sm) 0;
  z-index: 100;
}
.skip-link:focus {
  left: 0;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  font-size: 1.06rem;
}
.brand:hover {
  text-decoration: none;
}
.brand .mark {
  width: 28px;
  height: 28px;
  flex: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 9px;
  color: var(--ink-soft);
  font-size: 0.95rem;
  font-weight: 500;
}
.nav-links a:hover {
  background: var(--surface-2);
  color: var(--ink);
  text-decoration: none;
}
.nav-links a[aria-current="page"] {
  color: var(--accent);
  background: var(--accent-tint);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(56px, 7vw, 104px) 0 clamp(48px, 6vw, 88px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(
      60% 120% at 80% -10%,
      var(--accent-tint) 0%,
      transparent 60%
    ),
    var(--bg);
}

.hero-inner {
  max-width: 720px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-tint);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 22px;
}

.hero p.lead {
  font-size: clamp(1.08rem, 1rem + 0.5vw, 1.3rem);
  color: var(--ink-soft);
  max-width: 60ch;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 11px;
  font-weight: 600;
  font-size: 0.97rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.12s ease, border-color 0.12s ease;
}
.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}
.btn-primary {
  background: var(--accent);
  color: var(--on-accent);
}
.btn-primary:hover {
  background: var(--accent-strong);
}
.btn-ghost {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--line-strong);
}
.btn-ghost:hover {
  background: var(--surface-2);
}

/* ---------- Sections ---------- */
.section {
  padding: clamp(48px, 6vw, 88px) 0;
}
.section-tight {
  padding: clamp(36px, 4vw, 56px) 0;
}
.section + .section {
  border-top: 1px solid var(--line);
}

.section-head {
  max-width: 60ch;
  margin-bottom: 40px;
}
.section-head p {
  color: var(--muted);
  margin: 0;
}

/* ---------- Feature cards ---------- */
.grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: var(--line-strong);
}
.card .icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  background: var(--accent-tint);
  color: var(--accent);
  margin-bottom: 16px;
}
.card .icon svg {
  width: 22px;
  height: 22px;
}
.card h3 {
  margin-bottom: 6px;
}
.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.97rem;
}

/* ---------- Stat / band ---------- */
.band {
  background: var(--surface-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.quote {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}
.quote p {
  font-size: clamp(1.25rem, 1rem + 1vw, 1.7rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: 10px;
}
.quote span {
  color: var(--muted);
  font-size: 0.95rem;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 24px;
  text-align: center;
}
.stat .num {
  font-size: clamp(1.8rem, 1.3rem + 1.6vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--accent);
  display: block;
}
.stat .label {
  color: var(--muted);
  font-size: 0.92rem;
}

/* ---------- Prose (legal / about pages) ---------- */
.page-head {
  padding: clamp(48px, 6vw, 80px) 0 clamp(20px, 3vw, 36px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(50% 120% at 85% -20%, var(--accent-tint) 0%, transparent 55%),
    var(--bg);
}
.page-head .updated {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0;
}

.prose {
  max-width: 760px;
  margin-inline: auto;
  padding-block: clamp(40px, 5vw, 64px);
}
.prose h2 {
  margin-top: 2em;
  scroll-margin-top: 80px;
}
.prose h2:first-of-type {
  margin-top: 0;
}
.prose h3 {
  margin-top: 1.6em;
}
.prose p,
.prose li {
  color: var(--ink-soft);
}
.prose ul,
.prose ol {
  padding-left: 1.3em;
  margin: 0 0 1.1em;
}
.prose li {
  margin-bottom: 0.5em;
}
.prose strong {
  color: var(--ink);
}

.toc {
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-bottom: 36px;
}
.toc h2 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 0 0 12px;
}
.toc ol {
  margin: 0;
  padding-left: 1.2em;
  columns: 2;
  gap: 24px;
  font-size: 0.95rem;
}
.toc li {
  margin-bottom: 6px;
}

.note {
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  font-size: 0.95rem;
  color: var(--ink-soft);
}
.note p:last-child {
  margin-bottom: 0;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
  padding: 48px 0 36px;
}
.footer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 28px;
}
.footer-brand {
  max-width: 320px;
}
.footer-brand .brand {
  margin-bottom: 12px;
}
.footer-brand p {
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0;
}
.footer-col h4 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 0 0 12px;
}
.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.footer-col a {
  color: var(--ink-soft);
  font-size: 0.94rem;
}
.footer-col a:hover {
  color: var(--accent);
}
.footer-bottom {
  margin-top: 36px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.88rem;
}

/* ---------- Utilities ---------- */
.center {
  text-align: center;
}
.mt-0 {
  margin-top: 0;
}

@media (max-width: 560px) {
  body {
    font-size: 16px;
  }
  .nav-links a {
    padding: 8px 9px;
  }
  .toc ol {
    columns: 1;
  }
  .footer-grid {
    gap: 24px;
  }
}