/* ==========================================================================
   PulmHealth Foundation — main stylesheet (mobile-first)
   ========================================================================== */

/* Base ------------------------------------------------------------------ */
body {
  font-family: var(--font-sans);
  font-size: var(--fs-400);
  color: var(--text);
  background: var(--bg);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}
h1 { font-size: var(--fs-900); }
h2 { font-size: var(--fs-700); }
h3 { font-size: var(--fs-500); }
h4 { font-size: var(--fs-400); }
p { color: var(--text); }
a { color: var(--link); transition: color var(--transition); }
a:hover { color: var(--link-hover); }
strong { font-weight: 700; }

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-navy);
  color: #fff;
  padding: var(--space-3) var(--space-4);
  z-index: 1000;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; }

/* Layout ---------------------------------------------------------------- */
.page-container {
  width: min(100% - 2rem, var(--container-main));
  margin-inline: auto;
}
.container-wide { width: min(100% - 2rem, var(--container-wide)); margin-inline: auto; }
.container-reading { width: min(100% - 2rem, var(--container-reading)); margin-inline: auto; }

.section { padding-block: var(--space-8); }
.section-sm { padding-block: var(--space-7); }
.section-alt { background: var(--bg-alt); }
.section-navy { background: var(--color-navy); color: var(--text-invert); }
.section-navy h1, .section-navy h2, .section-navy h3 { color: #fff; }
.section-navy p { color: rgba(255,255,255,0.85); }

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-100);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-teal-deep);
  margin-bottom: var(--space-3);
}
.section-navy .eyebrow { color: var(--color-sky); }
.section-head { max-width: var(--container-reading); margin-bottom: var(--space-6); }
.lead { font-size: var(--fs-500); color: var(--text-muted); }
.section-navy .lead { color: rgba(255,255,255,0.85); }

/* Header ---------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.94);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: var(--border-1);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: var(--header-h);
}
.brand { display: inline-flex; align-items: center; }
.brand-logo { height: 40px; width: auto; }

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  min-width: 44px;
  min-height: 44px;
  padding: var(--space-2);
  color: var(--color-navy);
  border-radius: var(--radius-sm);
}
.nav-toggle-bar { display: block; width: 22px; height: 2px; background: currentColor; border-radius: 2px; }
.nav-toggle-text { font-size: var(--fs-100); font-weight: 600; }
.nav-close { display: none; }

.primary-nav .nav-list { display: flex; align-items: center; gap: var(--space-2); }
.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: var(--space-2) var(--space-3);
  font-weight: 600;
  color: var(--color-navy);
  border-radius: var(--radius-sm);
}
.nav-link:hover { background: var(--color-sky); color: var(--color-navy); }
.nav-link.is-active { color: var(--color-blue); box-shadow: inset 0 -2px 0 var(--color-blue); }

/* Buttons --------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-3) var(--space-5);
  font-weight: 700;
  border-radius: var(--radius-pill);
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
  text-align: center;
}
.btn:active { transform: translateY(1px); }
.btn-sm { min-height: 40px; padding: var(--space-2) var(--space-4); font-size: var(--fs-200); }
.btn-primary { background: var(--color-blue); color: #fff; }
.btn-primary:hover { background: var(--color-navy); color: #fff; }
.btn-secondary { background: transparent; color: var(--color-navy); border-color: var(--color-navy); }
.btn-secondary:hover { background: var(--color-navy); color: #fff; }
.btn-ghost { background: rgba(255,255,255,0.12); color: #fff; border-color: rgba(255,255,255,0.5); }
.btn-ghost:hover { background: #fff; color: var(--color-navy); }
.btn-block { width: 100%; }

/* Hero ------------------------------------------------------------------ */
.hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  background-color: #06203f;
  /* Fallback (JPG) first, then a WebP image-set for browsers that support it. */
  background-image:
    linear-gradient(90deg, rgba(4,20,40,0.94) 0%, rgba(4,20,40,0.80) 30%, rgba(4,20,40,0.46) 56%, rgba(4,20,40,0.12) 80%, rgba(4,20,40,0) 100%),
    url("/assets/img/graphics/hero-community.jpg");
  background-image:
    linear-gradient(90deg, rgba(4,20,40,0.94) 0%, rgba(4,20,40,0.80) 30%, rgba(4,20,40,0.46) 56%, rgba(4,20,40,0.12) 80%, rgba(4,20,40,0) 100%),
    image-set(url("/assets/img/graphics/hero-community.webp") type("image/webp"), url("/assets/img/graphics/hero-community.jpg") type("image/jpeg"));
  background-size: cover;
  background-position: right center;
  background-repeat: no-repeat;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  min-height: clamp(440px, 60vh, 620px);
  padding-block: var(--space-8);
  align-content: center;
}
.hero-copy { max-width: 640px; }
.hero h1 { color: #fff; text-shadow: 0 1px 14px rgba(0,0,0,0.35); }
.hero .lead { color: rgba(255,255,255,0.94); text-shadow: 0 1px 10px rgba(0,0,0,0.3); }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-5); }
.hero-visual { width: 100%; }
.hero-visual img, .hero-visual svg { width: 100%; height: auto; border-radius: var(--radius-lg); }

/* Cards ----------------------------------------------------------------- */
.card-grid { display: grid; gap: var(--space-5); }
.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5);
  background: #fff;
  border: var(--border-1);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
  height: 100%;
}
.card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.card-icon { width: 52px; height: 52px; }
.card h3 { color: var(--color-navy); }
.card p { color: var(--text-muted); font-size: var(--fs-300); }
.card-link { font-weight: 700; color: var(--color-blue); }
.card-link::after { content: " \2192"; }

/* Research / publication meta cards */
.research-card { border-left: 4px solid var(--color-teal); }
.pub-card h3 { font-size: var(--fs-400); }
.meta-list { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-4); font-size: var(--fs-100); color: var(--text-muted); }
.meta-list span { display: inline-flex; gap: 4px; }
.meta-list strong { color: var(--color-charcoal); font-weight: 600; }

/* Badges & status ------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-size: var(--fs-100);
  font-weight: 600;
  border-radius: var(--radius-pill);
  background: var(--color-sky);
  color: var(--color-navy);
}
.badge-pending { background: #FBEFD8; color: var(--color-warning); }
.badge-active { background: #DDF0E6; color: var(--color-success); }
.badge-planned { background: #E7EDF1; color: var(--color-gray); }

/* Callouts / alerts ----------------------------------------------------- */
.callout {
  padding: var(--space-5);
  border-radius: var(--radius);
  border: var(--border-1);
  border-left: 4px solid var(--color-blue);
  background: var(--color-mist);
}
.callout h3 { color: var(--color-navy); margin-bottom: var(--space-2); }
.callout p { color: var(--text-muted); }
.callout-warning { border-left-color: var(--color-warning); background: #FCF6EC; }
.callout-info { border-left-color: var(--color-teal); }

.disclosure {
  font-size: var(--fs-200);
  color: var(--text-muted);
  padding: var(--space-4) var(--space-5);
  background: var(--color-mist);
  border: var(--border-1);
  border-radius: var(--radius);
}

/* Prose (legal + long form) -------------------------------------------- */
.prose { max-width: var(--container-reading); }
.prose > * + * { margin-top: var(--space-4); }
.prose h2 { margin-top: var(--space-7); color: var(--color-navy); }
.prose h3 { margin-top: var(--space-5); color: var(--color-navy); }
.prose ul, .prose ol { margin-left: 1.25rem; display: grid; gap: var(--space-2); }
.prose li { list-style: disc; }
.prose ol li { list-style: decimal; }
.prose a { text-decoration: underline; }
.prose code { font-family: var(--font-mono); font-size: 0.9em; background: var(--color-mist); padding: 2px 5px; border-radius: 4px; }

/* Feature rows ---------------------------------------------------------- */
.feature-row { display: grid; gap: var(--space-6); align-items: center; }
.feature-media img, .feature-media svg { width: 100%; border-radius: var(--radius-lg); }

/* Stat / audience tiles ------------------------------------------------- */
.tile-grid { display: grid; gap: var(--space-4); }
.tile {
  padding: var(--space-4) var(--space-5);
  background: #fff;
  border: var(--border-1);
  border-radius: var(--radius);
  font-weight: 600;
  color: var(--color-navy);
}
.section-navy .tile { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.2); color: #fff; }

/* Accordions ------------------------------------------------------------ */
.accordion { border: var(--border-1); border-radius: var(--radius); overflow: hidden; }
.accordion + .accordion { margin-top: var(--space-3); }
.accordion-trigger {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  font-weight: 700;
  color: var(--color-navy);
  text-align: left;
  min-height: 44px;
}
.accordion-trigger:hover { background: var(--color-mist); }
.accordion-icon { transition: transform var(--transition); font-size: 1.25rem; }
.accordion-trigger[aria-expanded="true"] .accordion-icon { transform: rotate(45deg); }
.accordion-panel { padding: 0 var(--space-5) var(--space-5); color: var(--text-muted); }
.accordion-panel[hidden] { display: none; }

/* Forms ----------------------------------------------------------------- */
.form-grid { display: grid; gap: var(--space-5); max-width: var(--container-reading); }
.field { display: grid; gap: var(--space-2); }
.field label { font-weight: 600; color: var(--color-navy); }
.field .req { color: var(--color-danger); }
.field input, .field select, .field textarea {
  width: 100%;
  font-size: 16px; /* prevents iOS zoom */
  padding: var(--space-3) var(--space-4);
  border: var(--border-1);
  border-radius: var(--radius-sm);
  background: #fff;
  min-height: 44px;
}
.field textarea { min-height: 140px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--color-blue); }
.field-hint { font-size: var(--fs-100); color: var(--text-muted); }
.field-error { font-size: var(--fs-100); color: var(--color-danger); font-weight: 600; }
.hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.consent { display: flex; gap: var(--space-3); align-items: flex-start; }
.consent input { width: 20px; height: 20px; min-height: 20px; margin-top: 3px; }

.form-alert {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius);
  font-weight: 600;
}
.form-alert-error { background: #FBEAE8; color: var(--color-danger); border: 1px solid #E7B7B0; }
.form-alert-success { background: #DDF0E6; color: var(--color-success); border: 1px solid #A9D6BF; }
.form-errors { margin-left: 1.25rem; }
.form-errors li { list-style: disc; }

/* Breadcrumbs ----------------------------------------------------------- */
.breadcrumbs { font-size: var(--fs-200); color: var(--text-muted); padding-block: var(--space-4); }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.breadcrumbs li::after { content: "/"; margin-left: var(--space-2); color: var(--border); }
.breadcrumbs li:last-child::after { content: ""; }

/* Page header band ------------------------------------------------------ */
.page-hero { background: var(--color-mist); border-bottom: var(--border-1); }
.page-hero-inner { padding-block: var(--space-7); max-width: var(--container-reading); }
.page-hero h1 { color: var(--color-navy); }

/* Empty state ----------------------------------------------------------- */
.empty-state {
  text-align: center;
  padding: var(--space-8) var(--space-5);
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  color: var(--text-muted);
  background: var(--color-mist);
}
.empty-state svg { margin: 0 auto var(--space-4); width: 64px; height: 64px; }

/* CTA band -------------------------------------------------------------- */
.cta-band { text-align: center; }
.cta-band .hero-actions { justify-content: center; }

/* Footer ---------------------------------------------------------------- */
.site-footer { background: var(--color-navy); color: rgba(255,255,255,0.82); padding-block: var(--space-8) var(--space-6); margin-top: var(--space-9); }
.footer-inner { display: grid; gap: var(--space-7); }
.footer-logo { height: 40px; width: auto; }
.footer-tagline { margin-top: var(--space-3); color: rgba(255,255,255,0.7); max-width: 34ch; }
.footer-nav { display: grid; gap: var(--space-6); grid-template-columns: repeat(2, 1fr); }
.footer-heading { font-size: var(--fs-200); text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-sky); margin-bottom: var(--space-3); }
.footer-col ul { display: grid; gap: var(--space-2); }
.footer-col a { color: rgba(255,255,255,0.82); min-height: 40px; display: inline-flex; align-items: center; }
.footer-col a:hover { color: #fff; text-decoration: underline; }
.footer-legal { border-top: 1px solid rgba(255,255,255,0.15); padding-top: var(--space-5); display: grid; gap: var(--space-3); font-size: var(--fs-200); color: rgba(255,255,255,0.7); }
.footer-copy { color: rgba(255,255,255,0.55); }

/* Utilities ------------------------------------------------------------- */
.text-center { text-align: center; }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.divider { height: 1px; background: var(--border); border: 0; margin-block: var(--space-6); }