/* Brad Nail — steel board · fine fasteners · leftover hours */
:root {
  --steel: #4A5560;
  --pin-head: #C5CCD4;
  --pine: #2F4A3C;
  --board: #E8EDE8;
  --rust: #A65D3F;
  --ink: #1A2220;
  --board-deep: #D5DDD6;
  --grain: #C8D0C9;
  --white: #F7FAF7;
  --font-display: "Instrument Serif", "Palatino Linotype", Palatino, serif;
  --font-body: "Outfit", "Segoe UI", sans-serif;
  --font-label: "JetBrains Mono", ui-monospace, monospace;
  --wrap: 1120px;
  --narrow: 40rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --radius: 2px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(180deg, var(--board) 0%, var(--board-deep) 48%, var(--board) 100%);
  background-attachment: fixed;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--pine);
  text-underline-offset: 0.18em;
}

a:hover { color: var(--rust); }

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--white);
  padding: 0.75rem 1rem;
  z-index: 100;
}

.skip:focus { left: 1rem; top: 1rem; }

.wrap {
  width: min(100% - 2.5rem, var(--wrap));
  margin-inline: auto;
}

.wrap.narrow { width: min(100% - 2.5rem, var(--narrow)); }

/* ——— Top bar ——— */
.top {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--board) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid color-mix(in srgb, var(--steel) 22%, transparent);
}

.top__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 3.75rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: 0.01em;
}

.brand__mark { width: 1.55rem; height: 1.55rem; flex-shrink: 0; }

.nav {
  display: flex;
  gap: 1.25rem;
  font-family: var(--font-label);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav a {
  text-decoration: none;
  color: var(--steel);
}

.nav a:hover { color: var(--rust); }

/* ——— Hero ——— */
.hero {
  position: relative;
  min-height: min(100svh, 56rem);
  display: grid;
  align-items: end;
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(ellipse 90% 60% at 70% 20%, color-mix(in srgb, var(--pin-head) 55%, transparent), transparent 55%),
    linear-gradient(165deg, var(--board) 0%, var(--board-deep) 55%, #cfd8d1 100%);
}

.hero__board {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.hero__board svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__content {
  position: relative;
  z-index: 1;
  padding: clamp(5rem, 12vw, 8rem) 0 clamp(3rem, 8vw, 5rem);
  max-width: 34rem;
}

.brad-label {
  margin: 0 0 0.85rem;
  font-family: var(--font-label);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--rust);
}

.hero h1 {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(3.4rem, 9vw, 5.6rem);
  font-weight: 400;
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.hero__lead {
  margin: 0 0 1.75rem;
  font-size: 1.1rem;
  color: var(--steel);
  max-width: 32ch;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.85rem 1.35rem;
  background: var(--pine);
  color: var(--white);
  text-decoration: none;
  font-family: var(--font-label);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid var(--pine);
  border-radius: var(--radius);
  transition: background 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.btn:hover {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--white);
}

.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: color-mix(in srgb, var(--steel) 45%, transparent);
}

.btn--ghost:hover {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--white);
}

/* Brad drive-in motion */
.brad-drive {
  transform-box: fill-box;
  transform-origin: 50% 0%;
  animation: brad-seat 2.8s var(--ease) both;
}

.brad-drive--late {
  animation-delay: 0.55s;
  animation-duration: 3.1s;
}

@keyframes brad-seat {
  0% {
    transform: translateY(-28px);
    opacity: 0.15;
  }
  55% {
    opacity: 1;
  }
  100% {
    transform: translateY(0);
    opacity: 1;
  }
}

.brad-head-pulse {
  animation: head-settle 2.8s var(--ease) both;
}

.brad-head-pulse--late {
  animation-delay: 0.55s;
  animation-duration: 3.1s;
}

@keyframes head-settle {
  0%, 40% { transform: scale(0.7); opacity: 0.2; }
  100% { transform: scale(1); opacity: 1; }
}

/* ——— Sections ——— */
.section {
  padding: clamp(3rem, 7vw, 5rem) 0;
}

.section h2 {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 3.5vw, 2.45rem);
  font-weight: 400;
  line-height: 1.15;
  color: var(--ink);
}

.section > p.lead {
  margin: -0.4rem 0 1.75rem;
  color: var(--steel);
  max-width: 48ch;
}

.band {
  padding: clamp(2.5rem, 6vw, 4rem) 0;
  background: color-mix(in srgb, var(--pine) 92%, var(--ink));
  color: var(--board);
}

.band h2 { color: var(--board); }

.band .lead { color: var(--pin-head); }

.grain {
  display: grid;
  gap: 1.75rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grain__item h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 400;
  color: var(--white);
}

.grain__item p {
  margin: 0;
  color: var(--pin-head);
  font-size: 0.98rem;
}

.grain__n {
  margin: 0 0 0.55rem;
  font-family: var(--font-label);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rust);
}

/* Library — not cards: pin-row list */
.library {
  display: grid;
  gap: 0;
  border-top: 1px solid color-mix(in srgb, var(--steel) 28%, transparent);
}

.pin {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid color-mix(in srgb, var(--steel) 22%, transparent);
  align-items: start;
}

.pin__n {
  font-family: var(--font-label);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--rust);
  padding-top: 0.35rem;
}

.pin h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 400;
  line-height: 1.2;
}

.pin h3 a {
  text-decoration: none;
  color: var(--ink);
}

.pin h3 a:hover { color: var(--rust); }

.pin p {
  margin: 0 0 0.55rem;
  color: var(--steel);
  max-width: 52ch;
}

.pin__more {
  font-family: var(--font-label);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--pine);
}

.pin__more:hover { color: var(--rust); }

.standards,
.not-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.85rem;
}

.standards li,
.not-list li {
  position: relative;
  padding-left: 1.35rem;
  color: var(--steel);
}

.standards li::before,
.not-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--rust);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--rust) 22%, transparent);
}

.faq {
  display: grid;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.faq details {
  border-bottom: 1px solid color-mix(in srgb, var(--steel) 22%, transparent);
  padding: 0.65rem 0 0.85rem;
}

.faq summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--ink);
  list-style: none;
}

.faq summary::-webkit-details-marker { display: none; }

.faq summary::before {
  content: "+";
  display: inline-block;
  width: 1.25rem;
  font-family: var(--font-label);
  color: var(--rust);
}

.faq details[open] summary::before { content: "–"; }

.faq p {
  margin: 0.55rem 0 0;
  color: var(--steel);
}

.support-block {
  padding-top: 0.5rem;
  border-top: 1px solid color-mix(in srgb, var(--steel) 22%, transparent);
}

.support-block h2 { margin-bottom: 0.5rem; }

.support-block p { margin: 0; color: var(--steel); }

/* ——— Inner pages ——— */
.pagehead {
  padding: clamp(2.75rem, 7vw, 4.25rem) 0 1.5rem;
  border-bottom: 1px solid color-mix(in srgb, var(--steel) 18%, transparent);
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--pin-head) 35%, var(--board)), var(--board));
}

.pagehead h1 {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 400;
  line-height: 1.05;
}

.pagehead__intro {
  margin: 0;
  color: var(--steel);
  max-width: 42ch;
}

.paper {
  padding: clamp(2rem, 5vw, 3.25rem) 0 clamp(3rem, 7vw, 4.5rem);
}

.prose h2 {
  margin: 2rem 0 0.65rem;
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 400;
}

.prose p { margin: 0 0 1rem; color: var(--steel); }
.prose p:first-child { color: var(--ink); }

.prose ul {
  margin: 0 0 1.25rem;
  padding-left: 1.2rem;
  color: var(--steel);
}

.prose li { margin-bottom: 0.35rem; }

.prose .note {
  margin-top: 1.75rem;
  padding-top: 1rem;
  border-top: 1px solid color-mix(in srgb, var(--steel) 22%, transparent);
  font-size: 0.92rem;
  color: var(--steel);
}

/* ——— Footer ——— */
.foot {
  padding: 2.5rem 0 2rem;
  background: var(--ink);
  color: var(--pin-head);
}

.foot a { color: var(--board); }
.foot a:hover { color: var(--rust); }

.foot__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 2rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid color-mix(in srgb, var(--pin-head) 18%, transparent);
}

.foot__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--board);
}

.foot__lead {
  margin: 0;
  max-width: 38ch;
  font-size: 0.95rem;
  color: var(--pin-head);
}

.foot__nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.45rem 1rem;
  font-family: var(--font-label);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  align-content: start;
}

.foot__nav a { text-decoration: none; }

.foot__base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  padding-top: 1.25rem;
  font-size: 0.85rem;
  color: color-mix(in srgb, var(--pin-head) 75%, transparent);
}

.foot__base p { margin: 0; }

/* ——— Responsive ——— */
@media (max-width: 860px) {
  .grain { grid-template-columns: 1fr; }
  .foot__grid { grid-template-columns: 1fr; }
  .hero { min-height: min(100svh, 48rem); align-items: end; }
  .hero__content { max-width: 100%; }
  .pin { grid-template-columns: 3.5rem 1fr; }
}

@media (max-width: 520px) {
  .nav { gap: 0.85rem; }
  .wrap { width: min(100% - 1.5rem, var(--wrap)); }
  .wrap.narrow { width: min(100% - 1.5rem, var(--narrow)); }
  .foot__base { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .brad-drive,
  .brad-drive--late,
  .brad-head-pulse,
  .brad-head-pulse--late {
    animation: none !important;
  }
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}