/* ============================================================================
   copyleast — component layer
   Buttons, header/nav, footer, sections, cards, chips, forms.
   Depends on tokens.css + base.css.
   ========================================================================== */

/* ── Button (docs/design.md § 6) ──────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  border-radius: var(--radius-md);
  font-weight: 600;
  white-space: nowrap;
  user-select: none;
  transition:
    background-color var(--dur-base) var(--ease-standard),
    border-color var(--dur-base) var(--ease-standard),
    box-shadow var(--dur-base) var(--ease-standard),
    transform var(--dur-base) var(--ease-standard);
}
.btn:disabled,
.btn[aria-disabled="true"] {
  pointer-events: none;
  background: var(--neutral-300);
  color: var(--neutral-500);
  border-color: transparent;
}

/* Variants */
.btn--primary {
  background: var(--brand-500);
  color: #fff;
  border: 1px solid transparent;
}
.btn--primary:hover {
  background: var(--brand-400);
  box-shadow: var(--shadow-brand);
}
.btn--primary:active {
  background: var(--brand-600);
}
.btn--secondary {
  background: var(--neutral-0);
  color: var(--neutral-800);
  border: 1px solid var(--neutral-300);
}
.btn--secondary:hover {
  background: var(--neutral-50);
  border-color: var(--neutral-400);
}
.btn--ghost {
  background: transparent;
  color: var(--neutral-800);
  border: 1px solid transparent;
}
.btn--ghost:hover {
  background: var(--neutral-100);
}

/* Sizes */
.btn--md {
  min-height: 44px;
  padding-inline: var(--sp-5);
  font-size: 0.875rem;
}
.btn--lg {
  min-height: 52px;
  padding-inline: 1.75rem; /* 28px */
  font-size: 1rem;
}

/* Full-width helper */
.btn--block {
  width: 100%;
}

/* ── Site header ──────────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  border-bottom: 1px solid var(--neutral-200);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-6);
  height: 80px;
}
.site-header__logo {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}
.site-header__logo img {
  height: 28px;
  width: auto;
}

.site-nav {
  display: none;
  align-items: center;
  gap: 1.75rem;
}
.site-nav a {
  font-size: 0.875rem;
  color: var(--neutral-600);
  transition: color var(--dur-fast) var(--ease-standard);
}
.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--neutral-950);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}
.site-header__login {
  display: none;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--neutral-800);
}
.site-header__login:hover {
  color: var(--neutral-950);
}

/* Mobile menu toggle */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--neutral-800);
}
.nav-toggle .nav-toggle__close {
  display: none;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__open {
  display: none;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__close {
  display: block;
}

/* Mobile drawer */
.mobile-nav {
  display: none;
  border-top: 1px solid var(--neutral-200);
  background: #fff;
}
.mobile-nav.is-open {
  display: block;
}
.mobile-nav ul {
  display: flex;
  flex-direction: column;
  padding-block: var(--sp-2);
}
.mobile-nav a {
  display: block;
  padding: var(--sp-3) 0;
  font-size: 1rem;
  color: var(--neutral-700);
}
.mobile-nav a:hover {
  color: var(--neutral-950);
}

@media (min-width: 1024px) {
  .site-nav {
    display: flex;
  }
  .site-header__login {
    display: inline-block;
  }
  .site-header__actions {
    gap: var(--sp-6);
  }
  .nav-toggle {
    display: none;
  }
  .mobile-nav {
    display: none !important;
  }
}
@media (min-width: 640px) {
  .site-header__login {
    display: inline-block;
  }
}
@media (min-width: 768px) {
  .site-header__actions {
    gap: var(--sp-4);
  }
}

/* ── Shared washed page hero (pricing, about, detectors) ──────────────────── */
.page-hero {
  position: relative;
  overflow: hidden;
  background: var(--neutral-100);
  padding-top: var(--sp-16);
  padding-bottom: var(--sp-20);
}
@media (min-width: 768px) {
  .page-hero {
    padding-top: var(--sp-24);
    padding-bottom: var(--sp-32);
  }
}
.page-hero__wash {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(46rem 32rem at 8% -8%, rgba(255, 94, 0, 0.14), transparent 60%),
    radial-gradient(42rem 30rem at 94% 4%, rgba(255, 160, 77, 0.16), transparent 58%),
    radial-gradient(34rem 26rem at 82% 98%, rgba(255, 122, 31, 0.1), transparent 60%);
}
.page-hero__inner {
  position: relative;
}
.page-hero__head {
  max-width: 48rem;
  margin-inline: auto;
  text-align: center;
}
.page-hero__title {
  margin-top: var(--sp-5);
  color: var(--neutral-950);
}
.page-hero__sub {
  margin-inline: auto;
  margin-top: var(--sp-6);
  max-width: 36rem;
  color: var(--neutral-500);
}

/* ── Sections (docs/design.md § 5) ────────────────────────────────────────── */
.section {
  padding-block: var(--sp-20); /* 80px mobile */
}
@media (min-width: 768px) {
  .section {
    padding-block: var(--sp-32); /* 128px desktop */
  }
}
.section--page {
  background: var(--neutral-100);
  color: var(--neutral-950);
}
.section--raised {
  background: var(--neutral-0);
  color: var(--neutral-950);
}
.section--evidence {
  background: var(--neutral-950);
  color: var(--neutral-0);
}
/* Optional hairline rules above / around a section */
.section--rule-t {
  border-top: 1px solid var(--neutral-200);
}
.section--rule-y {
  border-top: 1px solid var(--neutral-200);
  border-bottom: 1px solid var(--neutral-200);
}

/* Section header block */
.section-header {
  max-width: 48rem; /* ~max-w-3xl */
}
.section-header--center {
  margin-inline: auto;
  text-align: center;
}
.section-header__overline {
  color: var(--brand-700);
}
.section--evidence .section-header__overline,
.section-header--inverted .section-header__overline {
  color: var(--brand-500);
}
.section-header__title {
  margin-top: var(--sp-4);
  color: var(--neutral-950);
}
.section--evidence .section-header__title,
.section-header--inverted .section-header__title {
  color: var(--neutral-0);
}
.section-header__lead {
  margin-top: var(--sp-5);
  max-width: var(--max-ui);
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--neutral-500);
}
.section-header__lead p + p {
  margin-top: var(--sp-4);
}
.section-header__lead strong {
  color: var(--neutral-950);
  font-weight: 600;
}
.section-header__lead em {
  font-style: italic;
}
.section-header--center .section-header__lead {
  margin-inline: auto;
}
.section--evidence .section-header__lead,
.section-header--inverted .section-header__lead {
  color: var(--neutral-300);
}

/* ── Numbered steps (stagger in) — home + detector pages ──────────────────── */
.steps {
  margin-top: 3.5rem;
  display: grid;
  gap: var(--sp-8);
}
@media (min-width: 768px) {
  .steps {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--sp-6);
  }
}
.step__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--brand-500);
}
.step__title {
  margin-top: var(--sp-3);
  color: var(--neutral-950);
}
.step__body {
  margin-top: var(--sp-2);
  color: var(--neutral-500);
}

/* ── Card ─────────────────────────────────────────────────────────────────── */
.card {
  background: var(--neutral-0);
  border: 1px solid var(--neutral-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--sp-6);
}
@media (min-width: 768px) {
  .card--roomy {
    padding: var(--sp-8);
  }
}

/* Icon chip — dark square + white 1.5px line icon (docs/illustrations.md § 6) */
.chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--neutral-950);
  color: #fff;
  flex-shrink: 0;
}
.chip svg {
  width: 20px;
  height: 20px;
}

/* ── Forms ────────────────────────────────────────────────────────────────── */
.field {
  display: block;
}
.field__label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--neutral-800);
  margin-bottom: 0.375rem;
}
.input,
.textarea {
  width: 100%;
  border: 1px solid var(--neutral-300);
  background: #fff;
  border-radius: var(--radius-md);
  padding: 0.625rem 0.75rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--neutral-950);
  transition: border-color var(--dur-fast) var(--ease-standard);
}
.input::placeholder,
.textarea::placeholder {
  color: var(--neutral-400);
}
.input:focus,
.textarea:focus {
  border-color: var(--brand-500);
  outline: none;
}
.input:focus-visible,
.textarea:focus-visible {
  outline: 2px solid var(--brand-500);
  outline-offset: 2px;
}
.textarea {
  resize: vertical;
  min-height: 120px;
}

/* ── Site footer ──────────────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--neutral-200);
  background: #fff;
}
.site-footer__grid {
  display: grid;
  gap: var(--sp-10);
  padding-block: var(--sp-16);
}
.site-footer__brand {
  max-width: 20rem;
}
.site-footer__brand img {
  height: 28px;
  width: auto;
}
.site-footer__tagline {
  margin-top: var(--sp-4);
  font-size: 0.875rem;
  color: var(--neutral-500);
}
.site-footer__col-heading {
  color: var(--neutral-400);
}
.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
}
.site-footer__links a {
  font-size: 0.875rem;
  color: var(--neutral-600);
  transition: color var(--dur-fast) var(--ease-standard);
}
.site-footer__links a:hover {
  color: var(--neutral-950);
}
.site-footer__bar {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  border-top: 1px solid var(--neutral-200);
  padding-block: var(--sp-6);
  font-size: 0.8125rem;
  color: var(--neutral-400);
}
@media (min-width: 640px) {
  .site-footer__bar {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}
@media (min-width: 768px) {
  .site-footer__grid {
    grid-template-columns: 1.5fr repeat(3, 1fr);
  }
}

/* ── CTA banner (reusable final-CTA band) ─────────────────────────────────── */
.cta-banner {
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--brand-100);
  background-color: var(--brand-50);
  background-image:
    radial-gradient(40rem 28rem at 12% 0%, rgba(255, 160, 77, 0.14), transparent 58%),
    radial-gradient(40rem 28rem at 88% 100%, rgba(255, 122, 31, 0.13), transparent 58%);
  padding-block: var(--sp-20);
}
@media (min-width: 768px) {
  .cta-banner {
    padding-block: var(--sp-24);
  }
}
.cta-banner__inner {
  position: relative;
  max-width: 42rem;
  margin-inline: auto;
  text-align: center;
}
.cta-banner__title {
  color: var(--neutral-950);
}
.cta-banner__body {
  margin-top: var(--sp-5);
  margin-inline: auto;
  max-width: var(--max-ui);
  color: var(--neutral-600);
}
.cta-banner__actions {
  margin-top: 2.25rem;
  display: flex;
  justify-content: center;
}
.cta-banner__reassurance {
  margin-top: var(--sp-5);
  color: var(--neutral-500);
}

/* Floating decorative 3D marks (hidden below lg, aria-hidden) */
.flying-marks {
  position: absolute;
  inset: 0;
  pointer-events: none;
  display: none;
}
.flying-marks img {
  position: absolute;
  max-width: none;
}
.flying-marks__a {
  left: -2rem;
  top: calc(50% - 6.5rem);
  width: 13rem;
  --float-rotate: -12deg;
}
.flying-marks__b {
  right: -1rem;
  top: 2rem;
  width: 9rem;
  --float-rotate: 18deg;
}
.flying-marks__c {
  right: 10rem;
  bottom: 1.5rem;
  width: 6rem;
  opacity: 0.7;
  --float-rotate: -6deg;
  animation-delay: -5s;
}
@media (min-width: 1024px) {
  .flying-marks {
    display: block;
  }
}
/* On wide viewports the two edge marks pull inward (mirrors xl:left-4 /
   xl:right-10) so they aren't flush against the screen edges. */
@media (min-width: 1280px) {
  .flying-marks__a {
    left: 1rem;
  }
  .flying-marks__b {
    right: 2.5rem;
  }
}

@keyframes copyleast-float {
  0%,
  100% {
    transform: translateY(0) rotate(var(--float-rotate, 0deg));
  }
  50% {
    transform: translateY(-14px) rotate(var(--float-rotate, 0deg));
  }
}
.float-slow {
  animation: copyleast-float 7s ease-in-out infinite;
}
.float-slower {
  animation: copyleast-float 9s ease-in-out infinite;
  animation-delay: -3s;
}