/* ============ Header / Nav ============ */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  background: color-mix(in srgb, var(--color-bg) 72%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--color-border) 70%, transparent);
}
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  padding-block: 14px;
}
.site-nav {
  display: flex; align-items: center; gap: clamp(12px, 2vw, 24px);
  font-size: var(--fs-sm);
}
.site-nav a { color: var(--color-text-mut); transition: color var(--dur-fast) var(--ease-spring); }
.site-nav a:hover { color: var(--color-text); }
.site-nav .btn { margin-left: 6px; }
@media (max-width: 640px) {
  .site-nav a:not(.btn) { display: none; }
}

/* ============ Brand ============ */
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-weight: 500;
  letter-spacing: -.01em; color: var(--color-text);
}
.brand__word { font-size: 1.05rem; }

/* ============ Buttons ============ */
.btn {
  --btn-bg: var(--color-surface-2);
  --btn-fg: var(--color-text);
  --btn-bd: var(--color-border-2);
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 18px;
  border-radius: var(--radius-pill);
  background: var(--btn-bg); color: var(--btn-fg);
  border: 1px solid var(--btn-bd);
  font-family: var(--font-display); font-weight: 500;
  font-size: var(--fs-sm);
  line-height: 1;
  transition: transform var(--dur-fast) var(--ease-spring),
              background var(--dur-fast) var(--ease-spring),
              border-color var(--dur-fast) var(--ease-spring),
              box-shadow var(--dur-base) var(--ease-spring);
  position: relative; isolation: isolate;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); border-color: var(--color-text-dim); }
.btn:active { transform: translateY(0); }
.btn--sm { padding: 9px 14px; font-size: var(--fs-xs); }
.btn--wide { width: 100%; justify-content: center; padding-block: 14px; }
.btn--primary {
  --btn-bg: linear-gradient(180deg, #1A2030 0%, #11151F 100%);
  --btn-fg: var(--color-text);
  --btn-bd: rgba(94,234,212,.45);
  box-shadow: var(--glow-success);
}
.btn--primary::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit;
  background: radial-gradient(120% 200% at 0% 0%, rgba(94,234,212,.18), transparent 50%);
  z-index: -1;
}
.btn--primary:hover { border-color: rgba(94,234,212,.7); }
.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--color-text);
  --btn-bd: var(--color-border-2);
}

/* spinner inside primary submit */
.btn__spin {
  width: 14px; height: 14px; border-radius: 50%;
  border: 2px solid rgba(232,236,241,.25);
  border-top-color: var(--color-text);
  animation: spin .8s linear infinite;
  display: none;
}
.btn.is-loading .btn__label { opacity: .5; }
.btn.is-loading .btn__spin { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ============ Eyebrow ============ */
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--color-text-mut);
  font-family: var(--font-display); font-weight: 500;
}
.eyebrow__dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 0 4px rgba(94,234,212,.12);
}
.eyebrow--mut { color: var(--color-text-dim); }

/* ============ Cards (generic) ============ */
.card {
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg-2) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 3vw, 28px);
  transition: border-color var(--dur-base) var(--ease-spring),
              transform var(--dur-base) var(--ease-spring);
}
.card:hover { border-color: var(--color-border-2); }

/* ============ Form fields ============ */
.field { display: grid; gap: 8px; }
.field__label {
  font-size: var(--fs-sm); color: var(--color-text-mut);
  font-family: var(--font-display); font-weight: 500;
}
.field__opt { color: var(--color-text-dim); font-weight: 400; }
.field__input {
  width: 100%;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  transition: border-color var(--dur-fast) var(--ease-spring),
              background var(--dur-fast) var(--ease-spring),
              box-shadow var(--dur-base) var(--ease-spring);
}
.field__input::placeholder { color: var(--color-text-dim); }
.field__input:focus {
  outline: none;
  border-color: var(--color-success);
  box-shadow: 0 0 0 3px rgba(94,234,212,.15);
}
.field__input[aria-invalid="true"] {
  border-color: var(--color-risk);
  box-shadow: 0 0 0 3px rgba(244,124,124,.12);
}
.field__err {
  color: var(--color-risk);
  font-size: var(--fs-xs);
  display: flex; align-items: center; gap: 6px;
}
.field__err::before { content: "·"; font-size: 1.5em; line-height: 0; color: currentColor; }

/* Chips */
.field--group { border: 0; padding: 0; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  position: relative;
  display: inline-flex; align-items: center;
  padding: 9px 14px;
  border: 1px solid var(--color-border-2);
  background: var(--color-surface-2);
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-size: var(--fs-sm);
  color: var(--color-text-mut);
  transition: all var(--dur-fast) var(--ease-spring);
}
.chip input { position: absolute; opacity: 0; pointer-events: none; }
.chip:hover { color: var(--color-text); border-color: var(--color-text-dim); }
.chip:has(input:checked) {
  color: var(--color-text);
  border-color: var(--color-quest-b);
  background: linear-gradient(180deg, rgba(124,111,240,.18), rgba(124,111,240,.05));
  box-shadow: var(--glow-quest);
}
.chip:has(input:focus-visible) { outline: 2px solid var(--color-focus); outline-offset: 2px; }

/* Linklike button */
.linklike {
  color: var(--color-success);
  border-bottom: 1px dashed currentColor;
  padding: 0; font: inherit;
}
.linklike:hover { color: #8af3e2; }

/* ============ Accordion (FAQ) ============ */
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  overflow: hidden;
  transition: border-color var(--dur-base) var(--ease-spring);
}
.faq-item + .faq-item { margin-top: 10px; }
.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 20px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px;
  font-family: var(--font-display); font-weight: 500;
  font-size: var(--fs-md);
  color: var(--color-text);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "";
  width: 22px; height: 22px;
  border-radius: 50%;
  background:
    linear-gradient(currentColor, currentColor) center / 10px 1.5px no-repeat,
    linear-gradient(currentColor, currentColor) center / 1.5px 10px no-repeat,
    var(--color-surface-2);
  border: 1px solid var(--color-border-2);
  flex: none;
  transition: transform var(--dur-base) var(--ease-spring),
              background-color var(--dur-base) var(--ease-spring);
  color: var(--color-text-mut);
}
.faq-item[open] summary::after {
  background:
    linear-gradient(currentColor, currentColor) center / 10px 1.5px no-repeat,
    var(--color-surface-2);
  color: var(--color-success);
  transform: rotate(180deg);
}
.faq-item[open] { border-color: var(--color-border-2); }
.faq-item__body {
  padding: 0 20px 20px;
  color: var(--color-text-mut);
  max-width: 70ch;
}

/* ============ Reveal animation ============ */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--dur-slow) var(--ease-spring),
              transform var(--dur-slow) var(--ease-spring);
  transition-delay: calc(var(--reveal-delay, 0) * 1ms);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============ Footer ============ */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-7) var(--space-5);
  background: linear-gradient(180deg, transparent, rgba(0,0,0,.2));
}
.site-footer__inner {
  display: grid; gap: var(--space-7);
  grid-template-columns: 1.2fr 2fr;
  align-items: start;
  padding-bottom: var(--space-6);
}
.site-footer__tag {
  color: var(--color-text-mut);
  max-width: 30ch;
  margin-top: 10px;
  font-size: var(--fs-sm);
}
.site-footer__nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
.site-footer__nav h4 {
  color: var(--color-text-dim);
  text-transform: uppercase; letter-spacing: .12em;
  font-size: var(--fs-xs);
  margin-bottom: 10px;
}
.site-footer__nav a {
  display: block;
  color: var(--color-text-mut);
  font-size: var(--fs-sm);
  padding-block: 4px;
  transition: color var(--dur-fast) var(--ease-spring);
}
.site-footer__nav a:hover { color: var(--color-text); }
.site-footer__bottom {
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  color: var(--color-text-dim);
  font-size: var(--fs-xs);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}

@media (max-width: 720px) {
  .site-footer__inner { grid-template-columns: 1fr; }
  .site-footer__nav { grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
}
@media (max-width: 480px) {
  .site-footer__nav { grid-template-columns: 1fr 1fr; }
}