/* ------------------------------------------------------------------ *
 *  Profile "more" threshold
 *
 *  A full-bleed rule sits at the vertical centre of the handle. Everything
 *  below it is tinted -- darker in light mode, lighter in dark mode -- so the
 *  page reads as having a boundary you can cross. Crossing it reveals the
 *  remaining sections in one motion.
 * ------------------------------------------------------------------ */

.threshold {
  position: relative;
  /* The rule is the vertical centre of this box, so the box is the hit area. */
  width: 100%;
  height: 4em;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 0 8px 0;
  border: 0;
  padding: 0;
  background: none;
  font: inherit;
  color: inherit;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.threshold:focus-visible {
  outline: none;
}

/* The tint itself is painted as the root background (see globals.css) -- an
   element tall enough to cover the rest of the page would extend the
   document's scrollable area. ProfileMore only publishes the line's position
   as `--threshold-y`. */

/* The rule itself. */
.threshold-rule {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 1px;
  pointer-events: none;
  transform: translateY(-0.5px);
  background: linear-gradient(
    to right,
    transparent 0%,
    var(--border) 12%,
    var(--border-strong) 50%,
    var(--border) 88%,
    transparent 100%
  );
  transition: background var(--duration-slow) var(--ease-in-out);
}

.threshold[data-armed="true"] .threshold-rule {
  background: linear-gradient(
    to right,
    transparent 0%,
    var(--accent-bg) 6%,
    var(--accent) 50%,
    var(--accent-bg) 94%,
    transparent 100%
  );
}

/* A soft glow that blooms out of the centre when the threshold is armed. */
.threshold-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 60%;
  height: 120px;
  pointer-events: none;
  transform: translate(-50%, -50%) scaleX(0.3);
  opacity: 0;
  background: radial-gradient(
    ellipse at center,
    var(--accent-bg) 0%,
    transparent 70%
  );
  transition:
    opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
}

.threshold[data-armed="true"] .threshold-glow {
  opacity: 1;
  transform: translate(-50%, -50%) scaleX(1);
}

/* The label pill. The rule passes behind it. */
.threshold-label {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg);
  font-family: var(--mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
  transition:
    color var(--duration-normal) var(--ease-in-out),
    border-color var(--duration-normal) var(--ease-in-out),
    background var(--duration-normal) var(--ease-in-out),
    transform var(--duration-slow) var(--ease-out);
}

/* Move the focus ring onto the pill -- the button itself is a full-width band. */
.threshold:focus-visible .threshold-label {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.threshold[data-armed="true"] .threshold-label {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--bg-raised);
  transform: translateY(3px);
}

.threshold-chevron {
  width: 11px;
  height: 11px;
  flex-shrink: 0;
  transition: transform var(--duration-slow) var(--ease-out);
}

.threshold[data-armed="true"] .threshold-chevron {
  transform: translateY(2px);
}

.threshold[data-open="true"] .threshold-chevron {
  transform: rotate(180deg);
}

/* ---- the reveal ---- */

/* 0fr -> 1fr is the animatable stand-in for height:auto, so the sections can
   size themselves to their real content without any JS measurement. */
.more-reveal {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 700ms var(--ease-out);
}

.more-reveal[data-open="true"] {
  grid-template-rows: 1fr;
}

.more-reveal > .more-reveal-inner {
  overflow: hidden;
  min-height: 0;
}

.more-section {
  opacity: 0;
  transform: translateY(14px);
  transition:
    opacity 500ms var(--ease-out),
    transform 500ms var(--ease-out);
}

.more-reveal[data-open="true"] .more-section {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .more-reveal,
  .more-section,
  .threshold-glow,
  .threshold-label,
  .threshold-chevron,
  .threshold-rule {
    transition-duration: 1ms !important;
  }

  .more-section {
    transition-delay: 0ms !important;
    transform: none;
  }
}