/* Minimalist, grid-first design with sharp corners and 1px black borders */
:root {
  --text: #111;
  --bg: #fff;
  --line: #000;
  --accent: #1F4FFF; /* Used exactly once: .btn-impact */
  --container: 1200px;
  --gutter: 24px;
}


* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); }
body { font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif; line-height: 1.6; }

a { color: var(--text); text-decoration: none; border-bottom: 1px solid transparent; }
a:hover { text-decoration: underline; }

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

h1, h2, h3 { margin: 0 0 12px 0; line-height: 1.25; }
.h1 { font-size: clamp(28px, 4vw, 44px); font-weight: 700; text-transform: none; }
.h2 { font-size: 24px; font-weight: 700; }
.h3 { font-size: 18px; font-weight: 700; }

.mono { font-family: 'Roboto Mono', ui-monospace, SFMono-Regular, Menlo, monospace; }
.small { font-size: 12px; }
.lead { font-size: 18px; max-width: 60ch; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); }
.section { padding: 48px 0; background: var(--bg); }
.border { border: 1px solid var(--line); }
.frame { border: 1px solid var(--line); padding: 12px; }
.caption { font-size: 12px; font-family: 'Roboto Mono', monospace; margin-top: 6px; color: #333; }
.note { margin-top: 16px; font-size: 14px; }

/* Grid */
.grid { display: grid; gap: var(--gutter); }
.cols-12 { grid-template-columns: repeat(12, 1fr); }
.col { min-width: 0; }
.span-12 { grid-column: span 12; }
.span-7 { grid-column: span 7; }
.span-6 { grid-column: span 6; }
.span-5 { grid-column: span 5; }
.span-4 { grid-column: span 4; }

@media (max-width: 900px) {
  .span-6, .span-7, .span-5, .span-4 { grid-column: span 12; }
}


.txt-impact { color: var(--accent); font-weight: 600; }
.txt-impact:hover { text-decoration: underline; }


/* Header */
.site-header { position: sticky; top: 0; background: var(--bg); z-index: 10; }
.header-grid { display: grid; grid-template-columns: 1fr auto; align-items: center; padding: 12px var(--gutter); }
.brand-link { font-weight: 700; font-size: 18px; text-decoration: none; }
.nav-list { list-style: none; display: flex; gap: 16px; margin: 0; padding: 0; }
.nav-toggle { display: none; border: 1px solid var(--line); background: var(--bg); padding: 6px 10px; }

@media (max-width: 760px) {
  .nav-toggle { display: inline-block; }
  .nav-list { display: none; position: absolute; right: 24px; top: 56px; flex-direction: column; background: #fff; border: 1px solid #000; padding: 12px; }
  .nav-list.open { display: flex; }
}

/* Announcement */
.announcement { border-left: 0; border-right: 0; border-top: 0; }
.announcement .container { padding: 8px var(--gutter); font-size: 14px; }

/* Hero */
.hero-copy { padding-top: 12px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 16px; }
.btn { display: inline-block; border: 1px solid var(--line); padding: 10px 14px; background: var(--bg); color: var(--text); text-decoration: none; }
.btn:hover { text-decoration: underline; }
.btn-ghost { border: 1px solid var(--line); background: transparent; }

/* The only colored element */
.btn-impact {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-impact:hover { text-decoration: underline; }

/* Cards */
.cards .card { padding: 16px; background: var(--bg); }
.images-grid .frame { padding: 10px; }

/* FAQ */
.faq details { padding: 12px; margin-bottom: 8px; }
.faq summary { cursor: pointer; }

/* Footer */
.site-footer { padding: 24px 0; }
.footer-grid { display: grid; grid-template-columns: 1fr auto; gap: 16px; align-items: start; }
.footer-links { list-style: none; display: flex; gap: 16px; margin: 0; padding: 0; }

/* Accessibility */
.skip-link { position: absolute; left: -9999px; top: auto; width: 1px; height: 1px; overflow: hidden; }
.skip-link:focus { position: static; width: auto; height: auto; padding: 6px 10px; background: #fff; border: 1px solid #000; }
.diagram { width: 100%; height: auto; display: block; }
.contribute-cta { display: flex; gap: 12px; align-items: flex-start; justify-content: flex-start; flex-wrap: wrap; }

/* Alignment & rhythm helpers */
.section .container > .h2:first-child { margin-bottom: 16px; }
.section p { margin: 0 0 12px; }
.bullets { margin: 0; padding-left: 18px; }
.bullets.compact li { margin: 2px 0; }
.header-grid, .footer-grid { padding-left: var(--gutter); padding-right: var(--gutter); }
.phone { display: inline-flex; align-items: center; gap: 12px; padding: 8px; margin-top: 8px; }

/* keep visited links neutral for single-accent rule */
a:visited{color:var(--text);}
/* Single-accent enforcement */
.btn-accent{ background: var(--accent); color:#fff; border:1px solid var(--line); }
.btn-accent:hover{ text-decoration: underline; }
.btn { transition: border-color .15s ease; }
.btn:hover, .btn:focus { border-color: var(--accent); outline: none; }

/* Additional grid helpers and components */
.cols-2 { display:grid; grid-template-columns: repeat(2, 1fr); gap: var(--gutter); }
.cols-3 { display:grid; grid-template-columns: repeat(3, 1fr); gap: var(--gutter); }
@media (max-width: 900px){ .cols-2, .cols-3 { grid-template-columns: 1fr; } }
.card { border:1px solid var(--line); padding:16px; background:#fff; }
.image-frame { border:1px solid var(--line); padding:12px; }
.image-frame figcaption { font-size:12px; font-family:'Roboto Mono', monospace; margin-top:6px; }
.rule { width:100%; height:1px; background:#000; }
.input { width:100%; padding:10px; background:#fff; color:#111; }