/* ==========================================================================
   GNS Newsletter Component — Stylesheet
   Vanilla CSS. No frameworks, no external fonts.
   All rules are scoped under .gns-newsletter so they cannot leak into
   (or be overridden by) the rest of the WordPress theme.

   Visual language: precision-instrument / technical-drawing cues rather
   than a rounded, glowing "SaaS widget" — hairline rules, corner marks,
   a restrained accent, and a structured (not pill-shaped) input+button
   pairing. Markup and JS hooks (classes, [data-state], [data-type],
   .is-loading, .is-visible) are unchanged from the previous version.
   ========================================================================== */

.gns-newsletter {
  /* ---- Design tokens (single source of truth) ------------------------- */
  /* Brand accent — the ONLY accent colour used in this component.
     --gns-accent-hover/-active are shades of the SAME colour, not new hues. */
  --gns-accent: #00aeef;
  --gns-accent-hover: #0096cc;
  --gns-accent-active: #007ea8;
  --gns-accent-soft: rgba(0, 174, 239, 0.08);

  /* Neutral UI tones — not brand accents, required for legible surfaces */
  --gns-border: rgba(15, 23, 42, 0.14);
  --gns-hairline: rgba(125, 138, 156, 0.35);
  --gns-input-bg: #ffffff;
  --gns-input-text: #0f172a;

  /* Semantic state colour — required for accessible error identification
     (WCAG 3.3.1). Kept desaturated so it never competes with the brand. */
  --gns-error: #c1432f;

  --gns-radius-sm: 7px;
  --gns-radius-lg: 8px;
  --gns-transition: 180ms ease;

  font-family: inherit;
  line-height: 1.5;
  color: inherit;
  box-sizing: border-box;
}

.gns-newsletter *,
.gns-newsletter *::before,
.gns-newsletter *::after {
  box-sizing: inherit;
}

/* ---- Card shell (default variant) --------------------------------------
   Used for Homepage sections, Landing Pages, News article bodies.
   A quiet, finished panel: soft border + a whisper of lift, with two
   small accent corner marks and an almost-imperceptible grid kept as a
   discreet engineering detail rather than a visible technical pattern. */

.gns-newsletter__container {
  max-width: 640px;
  margin-inline: auto;
  padding: clamp(2rem, 5vw, 3.5rem);
  border: 1px solid var(--gns-border);
  border-radius: var(--gns-radius-lg);
  box-shadow:
    0 1px 2px rgba(15, 23, 42, 0.03),
    0 10px 28px rgba(15, 23, 42, 0.035);
  text-align: left;

  background:
    linear-gradient(rgba(0, 174, 239, 0.6), rgba(0, 174, 239, 0.6)) top left / 16px 1.5px no-repeat,
    linear-gradient(rgba(0, 174, 239, 0.6), rgba(0, 174, 239, 0.6)) top left / 1.5px 16px no-repeat,
    linear-gradient(rgba(0, 174, 239, 0.6), rgba(0, 174, 239, 0.6)) bottom right / 16px 1.5px no-repeat,
    linear-gradient(rgba(0, 174, 239, 0.6), rgba(0, 174, 239, 0.6)) bottom right / 1.5px 16px no-repeat,
    repeating-linear-gradient(0deg, rgba(15, 23, 42, 0.012) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(90deg, rgba(15, 23, 42, 0.012) 0 1px, transparent 1px 44px),
    #fcfcfd;
}

.gns-newsletter__content {
  margin-bottom: 2rem;
  padding-left: 1.125rem;
  border-left: 2px solid var(--gns-accent);
}

.gns-newsletter__title {
  margin: 0 0 0.625rem;
  font-size: clamp(1.5rem, 1.6vw + 1rem, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.gns-newsletter__description {
  margin: 0;
  max-width: 42ch;
  font-size: 0.9375rem;
  line-height: 1.6;
  /* Derived from the inherited text colour (not a hardcoded dark tone) so
     it stays legible whether this sits on a light page or a dark footer. */
  color: inherit;
  opacity: 0.68;
}

/* ---- Form ---------------------------------------------------------------
   A structured input + a detached circular button, laid out side by side
   like a control and its actuator — deliberately not a single rounded
   "pill" shape, which is the most common generic-SaaS newsletter tell. */

.gns-newsletter__form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 420px;
}

.gns-newsletter__field {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Visually hidden but screen-reader accessible label */
.gns-newsletter__label {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.gns-newsletter__input {
  flex: 1;
  min-width: 0;
  height: 56px;
  padding: 0 20px;
  background: var(--gns-input-bg);
  color: var(--gns-input-text);
  border: 1px solid var(--gns-border);
  border-radius: var(--gns-radius-sm);
  font-family: inherit;
  font-size: 0.9375rem;
  letter-spacing: 0.01em;
  transition: border-color var(--gns-transition), box-shadow var(--gns-transition);
}

.gns-newsletter__input::placeholder {
  color: rgba(15, 23, 42, 0.4);
}

.gns-newsletter__input:hover {
  border-color: rgba(15, 23, 42, 0.3);
}

.gns-newsletter__input:focus-visible {
  outline: none;
  border-color: var(--gns-accent);
  box-shadow: inset 0 0 0 1px var(--gns-accent);
}

.gns-newsletter__field[data-state="error"] .gns-newsletter__input {
  border-color: var(--gns-error);
}

.gns-newsletter__field[data-state="error"] .gns-newsletter__input:focus-visible {
  box-shadow: inset 0 0 0 1px var(--gns-error);
}

/* ---- Circular submit button ---------------------------------------- */

.gns-newsletter__submit {
  flex: 0 0 auto;
  width: 56px;
  height: 56px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--gns-accent);
  color: #ffffff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: background-color var(--gns-transition), box-shadow var(--gns-transition), transform var(--gns-transition);
}

.gns-newsletter__submit:hover {
  background: var(--gns-accent-hover);
  box-shadow: 0 0 0 4px var(--gns-accent-soft);
}

.gns-newsletter__submit:active {
  background: var(--gns-accent-active);
  transform: scale(0.96);
}

.gns-newsletter__submit:focus-visible {
  outline: 2px solid var(--gns-accent);
  outline-offset: 3px;
}

.gns-newsletter__submit:disabled {
  cursor: default;
  opacity: 0.85;
}

.gns-newsletter__submit-icon {
  width: 18px;
  height: 18px;
  transition: transform var(--gns-transition);
}

.gns-newsletter__submit:hover:not(:disabled) .gns-newsletter__submit-icon {
  transform: translateX(2px);
}

/* Loading spinner swap-in (pure CSS, no extra markup dependency) */
.gns-newsletter__spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: gns-newsletter-spin 700ms linear infinite;
  display: none;
}

.gns-newsletter__submit.is-loading .gns-newsletter__submit-icon {
  display: none;
}

.gns-newsletter__submit.is-loading .gns-newsletter__spinner {
  display: block;
}

@keyframes gns-newsletter-spin {
  to {
    transform: rotate(360deg);
  }
}

/* ---- Status message (success / error) -------------------------------
   A small square marker (not a rounded dot) ahead of the text, echoing
   an instrument status light. Colour is inherited from data-type, so no
   JS changes are needed to drive it. */

.gns-newsletter__message {
  min-height: 1.25rem;
  margin: 0;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  text-align: left;
  opacity: 0;
  transform: translateY(-2px);
  transition: opacity var(--gns-transition), transform var(--gns-transition);
}

.gns-newsletter__message.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.gns-newsletter__message::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 8px;
  background: currentColor;
  vertical-align: middle;
}

.gns-newsletter__message[data-type="success"] {
  color: var(--gns-accent-active);
}

.gns-newsletter__message[data-type="error"] {
  color: var(--gns-error);
}

/* ---- Reduced motion --------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .gns-newsletter__submit,
  .gns-newsletter__submit-icon,
  .gns-newsletter__input,
  .gns-newsletter__message {
    transition: none;
  }

  .gns-newsletter__spinner {
    animation-duration: 1200ms;
  }
}

/* ---- Compact variant ---------------------------------------------------
   For tight/transparent contexts such as the site footer. Drops the card
   shell and lays title/description beside the form on wider viewports,
   separated by a hairline rule rather than a slab of empty gap. */

.gns-newsletter--compact .gns-newsletter__container {
  max-width: none;
  margin: 0;
  padding: 0;
  background: none;
  border: none;
  border-radius: 0;
  text-align: left;
}

.gns-newsletter--compact .gns-newsletter__content {
  margin-bottom: 2rem;
  padding-left: 0;
  border-left: none;
}

.gns-newsletter--compact .gns-newsletter__form {
  max-width: none;
}

@media (min-width: 780px) {
  .gns-newsletter--compact .gns-newsletter__container {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 3rem;
  }

  .gns-newsletter--compact .gns-newsletter__content {
    margin-bottom: 0;
    padding-right: 2.5rem;
    border-right: 1px solid var(--gns-hairline);
  }

  .gns-newsletter--compact .gns-newsletter__form {
    width: 360px;
    padding-left: 2.5rem;
  }
}

/* ---- Small screens ------------------------------------------------------ */

@media (max-width: 380px) {
  .gns-newsletter__input {
    height: 52px;
  }

  .gns-newsletter__submit {
    width: 48px;
    height: 48px;
  }
}