/**
 * Unified research newsletter signup — fused row (.pi-subscribe).
 * Styles are verbatim copies of the design source of truth:
 *   src/shared/samples/website-subscribers-form-variants-review.html
 * Do not edit values here in isolation — edit the review file first, then sync here.
 *
 * Load on any page that uses the macro:
 *   <link rel="stylesheet" href="{{ url_for('static', filename='shared/styles/subscribe-component.css') }}">
 */

/* ── Tokens (mirror of :root block in the review file) ── */
.pi-subscribe {
  --pi-font-ui: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --pi-radius-control: 8px;
  --pi-focus-border: rgba(255, 255, 255, 0.52);
  --pi-focus-ring: 0 0 0 1px rgba(255, 255, 255, 0.28);
  --pi-field-max-width: 360px;
  --pi-touch-min: 36px;
  --pi-kicker-color: rgba(255, 255, 255, 0.48);
  --pi-kicker-track: 0.18em;
  --pi-type-kicker: 0.625rem;
  --pi-type-input: 0.78rem;
  --pi-type-cta: 0.68rem;
  --pi-cta-pad-y: 0.5rem;
  --pi-cta-pad-x: 1rem;
  --pi-cta-track: 0.11em;
  --pi-input-pad-x: 0.75rem;
  --pi-input-pad-y: 0.5rem;
  --pi-btn-fused-min-width: 7.5rem;
  box-sizing: border-box;
}

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

/* ── Inner column: prevents kicker line from shrink-wrapping the fused bar ── */
.pi-subscribe__inner {
  width: 100%;
  max-width: var(--pi-field-max-width);
  margin-inline: auto;
}

/* ── Kicker — exact copy of .wss-kicker ── */
.pi-subscribe__kicker {
  font-size: var(--pi-type-kicker);
  letter-spacing: var(--pi-kicker-track);
  text-transform: uppercase;
  color: var(--pi-kicker-color);
  font-weight: 400;
  margin: 0 0 1rem;
  text-align: center;
  font-family: var(--pi-font-ui);
  line-height: 1.35;
}

/* ── Fused shell — exact copy of .wss-field ── */
.pi-subscribe__form {
  display: flex;
  align-items: stretch;
  width: 100%;
  max-width: var(--pi-field-max-width);
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--pi-radius-control);
  overflow: hidden;
  transition: border-color 0.2s, box-shadow 0.2s;
}

/* ── Focus ring on the shell — exact copy of .wss-field:focus-within ── */
.pi-subscribe__form:focus-within {
  border-color: var(--pi-focus-border);
  box-shadow: var(--pi-focus-ring);
  background: rgba(255, 255, 255, 0.05);
}

/* ── Email input — exact copy of .wss-field .wss-input--fused ── */
.pi-subscribe__input {
  flex: 1;
  min-width: 0;
  width: auto;
  min-height: var(--pi-touch-min);
  border: none;
  border-radius: 0;
  background: transparent;
  padding: var(--pi-input-pad-y) var(--pi-input-pad-x);
  font-size: var(--pi-type-input);
  font-family: var(--pi-font-ui);
  font-weight: 400;
  color: #ffffff;
  outline: none;
  box-shadow: none;
}

.pi-subscribe__input::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

.pi-subscribe__input:focus {
  box-shadow: none;
  background: transparent;
  border: none;
}

/* ── Submit button — exact copy of .wss-field .wss-btn--in-row ── */
.pi-subscribe__submit {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  /* in-row overrides */
  width: auto;
  min-width: var(--pi-btn-fused-min-width);
  flex-shrink: 0;
  min-height: 0;
  align-self: stretch;
  padding: var(--pi-cta-pad-y) var(--pi-cta-pad-x);
  /* no outer radius — sits inside the fused shell */
  border-radius: 0;
  border: none;
  border-left: 1px solid rgba(0, 0, 0, 0.1);
  /* platinum slab */
  color: #0a0a0a;
  background: linear-gradient(180deg, #fbfbf9 0%, #e4e4e0 55%, #d9d9d4 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.72),
    inset 0 -1px 0 rgba(0, 0, 0, 0.06),
    0 1px 0 rgba(0, 0, 0, 0.35);
  font-size: var(--pi-type-cta);
  font-weight: 600;
  letter-spacing: var(--pi-cta-track);
  text-transform: uppercase;
  font-family: var(--pi-font-ui);
  line-height: 1.2;
  cursor: pointer;
  white-space: nowrap;
  transition:
    transform 0.2s cubic-bezier(0.2, 0.85, 0.3, 1),
    box-shadow 0.2s ease,
    filter 0.2s ease,
    border-color 0.2s ease;
}

.pi-subscribe__submit:hover {
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.85),
    inset 0 -1px 0 rgba(0, 0, 0, 0.05),
    0 1px 0 rgba(0, 0, 0, 0.25),
    0 8px 22px rgba(0, 0, 0, 0.5);
}

.pi-subscribe__submit:active {
  filter: brightness(0.97);
}

.pi-subscribe__submit:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.85);
  outline-offset: 3px;
}

/* ── Dark button variant: same shell, button becomes black with white text ── */
.pi-subscribe--dark-btn .pi-subscribe__submit {
  color: #ffffff;
  background: #000000;
  border-left-color: rgba(255, 255, 255, 0.1);
  box-shadow: none;
}

.pi-subscribe--dark-btn .pi-subscribe__submit:hover {
  background: #1a1a1a;
  box-shadow: none;
}

/* ── Mobile: stack vertically ── */
@media (max-width: 480px) {
  .pi-subscribe__form {
    flex-direction: column;
  }

  .pi-subscribe__submit {
    width: 100%;
    min-width: 0;
    border-left: none;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 0;
  }
}