/* ============================================================
   PuraUse — Reset, base & primitives
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -0.018em;
  margin: 0;
  line-height: var(--lh-snug);
  text-wrap: balance;
}
h1 { font-size: var(--fs-h1); line-height: var(--lh-tight); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
h4 { font-size: var(--fs-h4); font-family: var(--font-body); font-weight: 700; letter-spacing: 0; }

p { margin: 0; text-wrap: pretty; }
p + p { margin-top: 1em; }

a { color: inherit; text-decoration: none; }

ul, ol { margin: 0; padding: 0; list-style: none; }

button, input, textarea, select {
  font: inherit;
  color: inherit;
  margin: 0;
}
button { background: none; border: 0; cursor: pointer; }

::selection { background: var(--aqua); color: var(--ink); }

/* ---- Focus: never removed, always visible ---- */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
  border-radius: 4px;
}
.footer :focus-visible,
.band :focus-visible { outline-color: var(--paper); }

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -100px;
  z-index: 200;
  background: var(--ink);
  color: var(--paper);
  padding: 0.875rem 1.5rem;
  border-radius: var(--r-pill);
  font-size: var(--fs-sm);
  transition: top var(--t-base) var(--e-out);
}
.skip-link:focus-visible { top: 1rem; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   Layout primitives
   ============================================================ */

.wrap {
  width: 100%;
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.wrap--narrow { max-width: 940px; }
.wrap--text   { max-width: 720px; }

.section { padding-block: var(--section); }
.section--sm { padding-block: var(--section-sm); }
.section--top-0 { padding-top: 0; }
.section--bottom-0 { padding-bottom: 0; }

.stack > * + * { margin-top: var(--flow, 1.25rem); }
.stack-lg { --flow: 2rem; }
.stack-sm { --flow: 0.75rem; }

.lead {
  font-size: var(--fs-lead);
  line-height: 1.55;
  color: var(--ink-70);
  max-width: 46ch;
}

.eyebrow {
  font-size: var(--fs-label);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-55);
  font-weight: 700;
  display: block;
}

.rule { height: 1px; background: var(--line); border: 0; margin: 0; }

/* ============================================================
   Buttons
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.9375rem 1.875rem;
  border-radius: var(--r-pill);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  white-space: nowrap;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background var(--t-base) var(--e-out),
              color var(--t-base) var(--e-out),
              border-color var(--t-base) var(--e-out),
              transform var(--t-fast) var(--e-out);
}
.btn:active { transform: translateY(1px); }

.btn--solid { background: var(--ink); color: var(--paper); }
.btn--solid:hover { background: var(--teal); }

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

.btn--light { background: var(--paper); color: var(--ink); }
.btn--light:hover { background: var(--aqua); }

.btn--outline-light { border-color: rgba(251,250,247,.45); color: var(--paper); }
.btn--outline-light:hover { background: var(--paper); color: var(--ink); }

.btn[disabled], .btn[aria-disabled="true"] { opacity: .45; pointer-events: none; }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  font-size: var(--fs-sm);
  color: var(--ink-70);
  transition: color var(--t-base) var(--e-out), gap var(--t-base) var(--e-out);
}
.link-arrow:hover { color: var(--ink); gap: 0.8125rem; }
.link-arrow svg { width: 15px; height: 15px; flex: none; }

.link-underline {
  display: inline-block;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 3px;
  transition: border-color var(--t-base) var(--e-out);
}
.link-underline:hover { border-color: var(--ink); }

/* ============================================================
   Scroll reveal (no-JS safe: visible by default, JS hides then reveals)
   ============================================================ */
.js [data-reveal] { opacity: 0; transform: translateY(14px); }
.js [data-reveal].is-in {
  opacity: 1;
  transform: none;
  transition: opacity 620ms var(--e-soft), transform 620ms var(--e-soft);
  transition-delay: var(--reveal-delay, 0ms);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js [data-reveal] { opacity: 1 !important; transform: none !important; transition: none !important; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}