/* Shared kinetic surfaces for Skills + Checklist (+ light Parents) */

body.engage-page {
  background:
    radial-gradient(900px 480px at 85% -5%, rgba(18, 163, 176, 0.2), transparent 55%),
    radial-gradient(640px 380px at 5% 35%, rgba(214, 255, 75, 0.07), transparent 50%),
    linear-gradient(180deg, #07151b 0%, #0b1c24 26%, var(--paper) 26%, var(--paper) 100%);
}

body.engage-page.is-guest .site-header,
body.engage-page.is-signed-in .site-header {
  background: rgba(7, 21, 27, 0.88);
  border-bottom-color: rgba(248, 252, 253, 0.1);
}

body.engage-page .wordmark,
body.engage-page .site-header nav a,
body.engage-page .site-header button.btn.ghost {
  color: var(--foam);
  border-color: rgba(248, 252, 253, 0.35);
}

body.engage-page .site-header nav a:hover,
body.engage-page .site-header nav a[aria-current="page"] {
  color: var(--signal);
}

body.engage-page .lang-switch {
  border-color: rgba(248, 252, 253, 0.35);
  color: var(--foam);
}

.engage-hero {
  position: relative;
  min-height: min(62vh, 520px);
  display: grid;
  align-items: end;
  overflow: hidden;
  color: var(--foam);
  padding-bottom: 2.25rem;
}

.engage-hero-atmosphere {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(155deg, rgba(7, 21, 27, 0.25), rgba(14, 124, 134, 0.38)),
    repeating-linear-gradient(
      -16deg,
      transparent 0 18px,
      rgba(248, 252, 253, 0.03) 18px 19px
    );
  animation: engage-grid 26s linear infinite;
}

.engage-hero-atmosphere::after {
  content: "";
  position: absolute;
  width: 38vmax;
  height: 38vmax;
  right: -14vmax;
  bottom: -16vmax;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(214, 255, 75, 0.26), transparent 65%);
  animation: engage-pulse 7s ease-in-out infinite;
}

.engage-hero-copy {
  position: relative;
  z-index: 1;
  padding: 5.25rem 0 0.75rem;
  width: min(var(--wrap), calc(100% - 2.5rem));
  margin-inline: auto;
}

.engage-hero .brand {
  color: var(--signal);
  opacity: 0;
  animation: engage-rise 0.85s ease forwards 0.1s;
}

.engage-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 5vw, 3.3rem);
  letter-spacing: -0.045em;
  line-height: 0.98;
  max-width: 16ch;
  margin: 0 0 1rem;
  opacity: 0;
  animation: engage-rise 0.85s ease forwards 0.28s;
}

.engage-hero .lede {
  max-width: 40ch;
  color: rgba(243, 247, 248, 0.88);
  opacity: 0;
  animation: engage-rise 0.85s ease forwards 0.45s;
}

.engage-hero .cta-row,
.engage-jump {
  opacity: 0;
  animation: engage-rise 0.85s ease forwards 0.62s;
}

.engage-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.25rem;
}

.engage-jump a,
.engage-jump button {
  appearance: none;
  border: 1px solid rgba(248, 252, 253, 0.28);
  background: rgba(7, 21, 27, 0.35);
  color: var(--foam);
  font: inherit;
  font-weight: 600;
  font-size: 0.88rem;
  padding: 0.55rem 0.85rem;
  border-radius: 0.35rem;
  cursor: pointer;
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.engage-jump a:hover,
.engage-jump button:hover,
.engage-jump a:focus-visible,
.engage-jump button:focus-visible {
  transform: translateY(-2px);
  border-color: var(--signal);
  background: rgba(214, 255, 75, 0.12);
  outline: none;
  color: var(--foam);
}

.engage-meter-wrap {
  position: sticky;
  top: 4rem;
  z-index: 15;
  background: linear-gradient(180deg, rgba(243, 247, 248, 0.96), rgba(243, 247, 248, 0.88));
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.engage-meter {
  width: min(var(--wrap), calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 0.85rem 0;
  display: grid;
  gap: 0.45rem;
}

.engage-meter-label {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.engage-meter-track {
  height: 0.55rem;
  border-radius: 999px;
  background: rgba(11, 28, 36, 0.1);
  overflow: hidden;
}

.engage-meter-fill {
  height: 100%;
  width: 0%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--lake), var(--signal));
  transition: width 0.55s cubic-bezier(0.22, 1, 0.36, 1);
  box-shadow: 0 0 18px rgba(214, 255, 75, 0.45);
}

.engage-board {
  width: min(var(--wrap), calc(100% - 2.5rem));
  margin: 2rem auto 3.5rem;
  display: grid;
  gap: 1.75rem;
}

.engage-section {
  scroll-margin-top: 7rem;
}

.engage-section h2 {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3vw, 2.05rem);
  letter-spacing: -0.03em;
  margin: 0 0 0.45rem;
}

.engage-section .section-lede {
  margin: 0 0 1.1rem;
  color: var(--ink-soft);
  max-width: 48ch;
}

.engage-tiles {
  display: grid;
  gap: 0.85rem;
  grid-template-columns: 1fr;
}

@media (min-width: 760px) {
  .engage-tiles {
    grid-template-columns: 1fr 1fr;
  }
}

.engage-tile {
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: #fff;
  padding: 0;
  overflow: hidden;
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.engage-tile:hover {
  transform: translateY(-3px);
  border-color: rgba(14, 124, 134, 0.4);
  box-shadow: 0 14px 30px rgba(11, 28, 36, 0.08);
}

.engage-tile.is-done {
  border-color: rgba(14, 124, 134, 0.45);
  background: linear-gradient(180deg, rgba(214, 255, 75, 0.16), #fff 55%);
}

.engage-tile-btn {
  width: 100%;
  display: grid;
  gap: 0.35rem;
  text-align: left;
  border: 0;
  background: transparent;
  padding: 1.05rem 1.1rem 0.85rem;
  font: inherit;
  color: inherit;
  cursor: pointer;
}

.engage-tile-kicker {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--lake);
}

.engage-tile-btn strong {
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.engage-tile-btn span {
  color: var(--ink-soft);
  font-size: 0.95rem;
  line-height: 1.4;
}

.engage-tile-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0 1.1rem 1.05rem;
}

.engage-tile-actions .btn {
  padding: 0.55rem 0.85rem;
  font-size: 0.88rem;
}

.engage-flip-grid {
  display: grid;
  gap: 0.85rem;
  grid-template-columns: 1fr;
}

@media (min-width: 700px) {
  .engage-flip-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.engage-flip {
  perspective: 1000px;
  min-height: 9.5rem;
}

.engage-flip-inner {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 9.5rem;
  transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(0.22, 1, 0.36, 1);
  cursor: pointer;
}

.engage-flip.is-flipped .engage-flip-inner {
  transform: rotateY(180deg);
}

.engage-flip-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: #fff;
  padding: 1.1rem;
  display: grid;
  align-content: center;
  gap: 0.35rem;
}

.engage-flip-face.back {
  transform: rotateY(180deg);
  background: #0b1c24;
  color: var(--foam);
  border-color: transparent;
}

.engage-flip-face .term {
  font-family: var(--font-display);
  font-size: 1.45rem;
  letter-spacing: -0.03em;
}

.engage-flip-face .hint {
  font-size: 0.85rem;
  color: var(--lake);
  font-weight: 600;
}

.engage-flip-face.back .hint {
  color: var(--signal);
}

.prompt-lab {
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: #fff;
  padding: 1.15rem;
  display: grid;
  gap: 0.75rem;
}

.prompt-lab label {
  display: grid;
  gap: 0.3rem;
  font-weight: 600;
  font-size: 0.9rem;
}

.prompt-lab input,
.prompt-lab textarea {
  font: inherit;
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 0.35rem;
  background: var(--foam);
  color: var(--ink);
}

.prompt-lab textarea {
  min-height: 4.5rem;
  resize: vertical;
}

.prompt-output {
  margin: 0;
  padding: 0.95rem 1rem;
  border-radius: 0.4rem;
  background: #0b1c24;
  color: var(--foam);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88rem;
  white-space: pre-wrap;
  line-height: 1.45;
}

.engage-checks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.engage-checks li {
  margin: 0;
}

.engage-check {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem;
  align-items: start;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  background: #fff;
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.engage-check:hover {
  transform: translateY(-1px);
  border-color: rgba(14, 124, 134, 0.45);
}

.engage-check input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.engage-check .box {
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 0.3rem;
  border: 2px solid var(--lake);
  margin-top: 0.1rem;
  display: grid;
  place-items: center;
  transition: background 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.engage-check .box::after {
  content: "";
  width: 0.35rem;
  height: 0.65rem;
  border: solid transparent;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) scale(0);
  transition: transform 160ms ease, border-color 160ms ease;
}

.engage-check:has(input:checked) {
  background: rgba(214, 255, 75, 0.18);
  border-color: rgba(14, 124, 134, 0.35);
}

.engage-check:has(input:checked) .box {
  background: var(--signal);
  border-color: var(--signal-ink);
  transform: scale(1.05);
}

.engage-check:has(input:checked) .box::after {
  border-color: var(--signal-ink);
  transform: rotate(45deg) scale(1);
}

.engage-check:has(input:checked) .label {
  text-decoration: line-through;
  color: var(--ink-soft);
}

.engage-check .label {
  font-size: 0.98rem;
  line-height: 1.4;
}

.engage-block {
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: rgba(255, 255, 255, 0.72);
  overflow: hidden;
}

.engage-block summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  padding: 1rem 1.15rem;
  background: #fff;
}

.engage-block summary::-webkit-details-marker {
  display: none;
}

.engage-block[open] summary {
  border-bottom: 1px solid var(--line);
}

.engage-block-body {
  padding: 1rem 1.15rem 1.2rem;
}

.engage-finale {
  width: min(640px, calc(100% - 2.5rem));
  margin: 0 auto 4rem;
}

.engage-finale h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.03em;
  margin: 0 0 0.55rem;
}

.engage-burst {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 40;
  overflow: hidden;
}

.engage-burst i {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  opacity: 0;
  animation: engage-burst 0.9s ease-out forwards;
}

@keyframes engage-rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes engage-grid {
  to {
    background-position: 0 0, 110px 70px;
  }
}

@keyframes engage-pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.85;
  }
  50% {
    transform: scale(1.08);
    opacity: 1;
  }
}

@keyframes engage-burst {
  0% {
    opacity: 1;
    transform: translate(0, 0) scale(1);
  }
  100% {
    opacity: 0;
    transform: translate(var(--dx), var(--dy)) scale(0.4);
  }
}

@media (prefers-reduced-motion: reduce) {
  .engage-hero-atmosphere,
  .engage-hero-atmosphere::after,
  .engage-hero .brand,
  .engage-hero h1,
  .engage-hero .lede,
  .engage-hero .cta-row,
  .engage-jump,
  .engage-burst i {
    animation: none !important;
  }

  .engage-hero .brand,
  .engage-hero h1,
  .engage-hero .lede,
  .engage-hero .cta-row,
  .engage-jump {
    opacity: 1;
    transform: none;
  }

  .engage-flip-inner {
    transition: none;
  }

  .engage-tile:hover {
    transform: none;
  }
}