/* ==========================================================================
   Adaptive verification dialog.
   Native <dialog> for the focus trap and Escape handling, a pointer driven
   slider that travels right to left, and a proof of work solved in the
   background while the gesture happens.
   ========================================================================== */

dialog {
  border: none;
  padding: 0;
  background: none;
  max-width: min(430px, calc(100vw - 32px));
  color: var(--text);
}
dialog::backdrop { background: oklch(16% 0.02 158 / .55); backdrop-filter: blur(3px); }

.verify {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-3);
  padding: 24px;
}
.verify__hd { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; }
.verify h3 { font-size: 1.0625rem; letter-spacing: -0.02em; }
.verify__sub { font-size: 0.8125rem; color: var(--text-2); margin: 6px 0 20px; max-width: 40ch; }
.verify__close { color: var(--text-3); padding: 4px; border-radius: 6px; line-height: 0; }
.verify__close:hover { color: var(--text); background: var(--paper-3); }

.slider {
  position: relative;
  height: 52px;
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--paper-3);
  border: 1px solid var(--line-strong);
  touch-action: none;
  user-select: none;
}
.slider__fill {
  position: absolute;
  top: 0; right: 0;
  height: 100%;
  width: 0;
  background: var(--pine-soft);
  border-left: 1px solid var(--pine-line);
}
.slider__hint {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 0.8125rem;
  color: var(--text-3);
  letter-spacing: 0.01em;
  pointer-events: none;
}
.slider__handle {
  position: absolute;
  top: 3px; right: 3px;
  width: 60px; height: 44px;
  border-radius: 7px;
  background: var(--paper-2);
  border: 1px solid var(--line-strong);
  box-shadow: var(--sh-2);
  display: grid;
  place-items: center;
  cursor: grab;
  color: var(--text-2);
  transition: background .15s var(--ease-out-quart), border-color .15s var(--ease-out-quart);
}
.slider__handle:hover { background: var(--paper); }
.slider__handle:active { cursor: grabbing; }

.slider[data-state='ok'] .slider__fill   { background: var(--pine); border-color: var(--pine); }
.slider[data-state='ok'] .slider__hint   { color: var(--paper-2); font-weight: 600; }
.slider[data-state='ok'] .slider__handle { background: var(--pine); border-color: var(--pine-deep); color: var(--paper-2); }
.slider[data-state='fail'] { border-color: var(--red-line); animation: nudge .3s var(--ease-out-quart); }
.slider[data-state='working'] .slider__hint { color: var(--text-2); }

@keyframes nudge {
  25% { transform: translateX(4px); }
  75% { transform: translateX(-4px); }
}

.verify__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 16px;
  font-size: 0.6875rem;
  color: var(--text-3);
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
}
.verify__foot span { display: flex; align-items: center; gap: 6px; }

/* --------------------------------------------------------------------------
   Small screens
   --------------------------------------------------------------------------
   The slider is a drag gesture, so it is the one control that must not shrink:
   a short track on a touch screen is harder to complete than a long one, and a
   failed drag reads as a broken form rather than a missed target.
   -------------------------------------------------------------------------- */
@media (max-width: 560px) {
  .verify { padding: 20px 16px; }
  .verify h3 { font-size: 1rem; }
  .verify__sub { margin-bottom: 16px; }

  /* Taller track, wider handle: both help a thumb rather than a cursor. */
  .slider { height: 58px; }
  .slider__handle { width: 68px; height: 50px; }

  .verify__foot { flex-direction: column; align-items: flex-start; gap: 6px; }
}