/* ==========================================================================
   Components — buttons, cards, pillboxy, accordion, nav
   ========================================================================== */

/* ---- Button (primary CTA) ------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 14px 24px;
  border-radius: var(--r-xl);
  font-family: var(--ff-display);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-body);
  line-height: 1;
  cursor: pointer;
  transition: transform var(--dur-base) var(--ease-spring),
              box-shadow var(--dur-base) var(--ease-out),
              filter var(--dur-base) var(--ease-out);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--aiu-gradient-h);
  color: var(--aiu-white);
  box-shadow: var(--sh-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  filter: brightness(1.08);
  box-shadow: 0 14px 38px rgba(0,117,238,.32);
}

.btn-primary:focus-visible { outline: none; box-shadow: var(--focus-ring), var(--sh-glow); }

.btn-lg {
  padding: 18px 32px;
  font-size: var(--fs-h4);
}

.btn-meta {
  display: block;
  margin-top: var(--sp-2);
  font-size: var(--fs-small);
  font-weight: var(--fw-regular);
  color: var(--fg-on-light-2);
  font-family: var(--ff-body);
}

.on-dark .btn-meta { color: var(--fg-on-dark-2); }

/* ---- Pillbox (trust signals) ---------------------------------------- */
.pill {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 8px 14px;
  border-radius: var(--r-xl);
  font-family: var(--ff-body);
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  background: rgba(0,176,149,.14);
  color: var(--aiu-teal);
}

.on-dark .pill {
  background: rgba(255,255,255,.08);
  color: var(--fg-on-dark-1);
  border: 1px solid var(--border-dark);
}

/* ---- Card (general) -------------------------------------------------- */
.card {
  background: var(--bg-card);
  border-radius: var(--r-md);
  padding: var(--sp-6);
  box-shadow: var(--sh-sm);
  transition: transform var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--sh-md);
}

/* ---- Section wrapper ------------------------------------------------- */
.section {
  padding: var(--sp-9) var(--sp-5);
}

.section-light { background: var(--bg-canvas); }
.section-subtle { background: var(--bg-light); }
.section-dark { background: var(--bg-dark); color: var(--fg-on-dark-1); }

.section-inner {
  max-width: 1160px;
  margin: 0 auto;
}

/* ---- Accordion (FAQ) ------------------------------------------------- */
.accordion-item {
  background: var(--bg-canvas);
  border: 1px solid var(--border-light);
  border-radius: var(--r-md);
  margin-bottom: var(--sp-3);
  transition: background var(--dur-base) var(--ease-out);
}

.accordion-item[open] {
  background: var(--bg-light);
}

.accordion-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  padding: var(--sp-5);
  font-family: var(--ff-display);
  font-weight: var(--fw-semibold);
  font-size: 17px;
  cursor: pointer;
  list-style: none;
}

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

.accordion-item summary::after {
  content: '+';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--r-full);
  background: var(--aiu-slate-100);
  color: var(--fg-on-light-1);
  font-size: 18px;
  font-weight: var(--fw-bold);
  transition: transform var(--dur-base) var(--ease-spring),
              background var(--dur-base) var(--ease-out);
}

.accordion-item[open] summary::after {
  background: var(--aiu-gradient-h);
  color: var(--aiu-white);
  transform: rotate(45deg);
}

.accordion-body {
  padding: 0 var(--sp-5) var(--sp-5);
  font-size: var(--fs-small);
  line-height: var(--lh-body);
  color: var(--fg-on-light-2);
}

/* ---- Sticky nav ------------------------------------------------------ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  transition: box-shadow var(--dur-base) var(--ease-out),
              background var(--dur-base) var(--ease-out);
}

.nav-inner {
  max-width: 1160px;
  margin: 0 auto;
  padding: var(--sp-3) var(--sp-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
}

.nav-logo { display: inline-flex; }
.nav-logo img { height: 36px; width: auto; display: block; }

.nav-cta {
  padding: 10px 18px;
  font-size: var(--fs-small);
}

.nav-scrolled {
  box-shadow: var(--sh-sm);
  background: rgba(255,255,255,.95);
}