:root {
  --page: #0d1726;
  --card: #17263c;
  --card-hi: #1e3350;
  --line: #2b3f5c;
  --text: #eef3f9;
  --muted: #9db0c9;
  --amber: #f4b740;
  --green: #45d093;
  --red: #ff8a7a;
  --radius: 22px;
}

* { box-sizing: border-box; }

/* Keep the hidden attribute in charge; flex and grid would otherwise win. */
[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(120% 80% at 50% 0%, #16273f 0%, var(--page) 60%);
  color: var(--text);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  padding: 32px 20px 48px;
  display: flex;
  justify-content: center;
}

.app { width: 100%; max-width: 780px; }

.top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.brand { font-size: 18px; font-weight: 700; letter-spacing: .02em; }
.brand b { color: var(--amber); }
.top-right { display: flex; align-items: center; gap: 10px; }

.chip {
  background: var(--card); border: 1px solid var(--line); border-radius: 999px;
  padding: 6px 14px; font-size: 14px; color: var(--muted);
}
.chip b { color: var(--green); }

.ghost {
  background: none; border: 1px solid var(--line); color: var(--muted);
  border-radius: 999px; padding: 6px 14px; font: inherit; font-size: 14px; cursor: pointer;
}
.ghost:hover { color: var(--text); border-color: var(--muted); }

.pips { display: flex; gap: 6px; margin-bottom: 24px; }
.pip { height: 6px; flex: 1; border-radius: 999px; background: #24374f; }
.pip.done { background: var(--amber); }
.pip.missed { background: var(--red); }
.pip.now { background: #ffffff; }

.panel {
  background: linear-gradient(180deg, var(--card-hi), var(--card));
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px; box-shadow: 0 18px 40px rgba(0, 0, 0, .28);
}

.eyebrow {
  color: var(--muted); font-size: 13px; letter-spacing: .09em;
  text-transform: uppercase; margin: 0 0 12px;
}

h1 { font-size: 26px; line-height: 1.32; margin: 0 0 24px; font-weight: 640; }
h2 { font-size: 20px; margin: 0 0 12px; }
p { margin: 0 0 14px; }

.options { display: grid; gap: 12px; }

.option {
  display: flex; align-items: center; gap: 16px; width: 100%; text-align: left;
  background: rgba(18, 32, 49, .5); border: 1px solid var(--line); color: inherit;
  border-radius: 14px; padding: 16px 20px; font: inherit; cursor: pointer;
}
.option:hover:not(:disabled) { border-color: var(--muted); }
.option:disabled { cursor: default; }
.option .key {
  flex: none; width: 30px; height: 30px; border-radius: 9px; display: grid;
  place-items: center; background: #24374f; font-weight: 650;
}
.option.correct { border-color: var(--green); background: #123a2e; }
.option.correct .key { background: var(--green); color: #06231a; }
.option.wrong { border-color: var(--red); background: #3a1c1c; }
.option.wrong .key { background: var(--red); color: #3a0c0c; }
.option.faded { opacity: .5; }

:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }

.feedback { margin-top: 24px; border-top: 1px solid var(--line); padding-top: 18px; }
.verdict { font-weight: 700; margin: 0 0 8px; }
.verdict.good { color: var(--green); }
.verdict.bad { color: var(--red); }
.source { color: var(--muted); font-size: 14px; margin: 10px 0 0; }
.source a { color: var(--amber); }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
.primary {
  background: var(--amber); color: #2a1c00; border: none; border-radius: 12px;
  padding: 13px 22px; font: inherit; font-weight: 650; cursor: pointer;
}
.primary:hover { filter: brightness(1.06); }

.modules { display: grid; gap: 12px; grid-template-columns: 1fr; }

/* Thirteen modules in one column is a long scroll. Two columns keep the whole
   course visible without shrinking the type. */
@media (min-width: 700px) {
  .modules { grid-template-columns: 1fr 1fr; }
  .modules .module:last-child { grid-column: 1 / -1; }
}

.module {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  background: rgba(18, 32, 49, .5); border: 1px solid var(--line); color: inherit;
  border-radius: 14px; padding: 15px 18px; font: inherit; text-align: left; cursor: pointer;
}
.module:hover:not(:disabled) { border-color: var(--muted); }
.module:disabled { opacity: .45; cursor: default; }
.module .title { font-weight: 600; }
.module .title, .module .blurb { display: block; }
.module .blurb {
  color: var(--muted); font-size: 13.5px; margin-top: 3px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.module .count { flex: none; color: var(--muted); font-size: 14px; font-variant-numeric: tabular-nums; }

.hint { color: var(--muted); font-size: 14px; margin: -8px 0 16px; }

.card-flip {
  width: 100%; min-height: 200px; border: 1px solid var(--line); border-radius: 18px;
  background: rgba(18, 32, 49, .5); color: inherit; font: inherit; font-size: 20px;
  padding: 28px; cursor: pointer; display: grid; place-items: center; text-align: center;
}
.card-flip .hint { display: block; color: var(--muted); font-size: 14px; margin-top: 10px; }

.pairs { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.pair-col { display: grid; gap: 10px; align-content: start; }

/* Matching: the right-hand side is a set of slots, and a card that has been
   placed sits inside its slot with a number, so it is obvious what went where
   and any pairing can be undone by tapping it. */
.slot {
  display: grid; gap: 8px; align-content: start; min-height: 62px;
  border: 1px dashed var(--line); border-radius: 12px; padding: 12px 14px;
  background: rgba(13, 23, 38, .45); cursor: pointer;
  transition: border-color 240ms ease, background-color 240ms ease;
}
.slot:hover { border-color: var(--muted); }
.slot.filled { border-style: solid; border-color: #3a5573; background: rgba(24, 42, 63, .6); }
.slot.drop-active { border-color: var(--amber); background: rgba(244, 183, 64, .09); }
.slot.right { border-color: var(--green); background: #123a2e; }
.slot.wrong { border-color: var(--red); background: #3a1c1c; }
.slot-label { color: var(--text); }
.slot-empty { color: var(--muted); font-size: 13px; }

.chip {
  display: inline-flex; align-items: center; gap: 9px;
  background: #24374f; border-radius: 999px; padding: 7px 13px; font-size: 14.5px;
  animation: chip-drop 320ms cubic-bezier(.2, .9, .3, 1);
}
.chip-n {
  display: grid; place-items: center; width: 20px; height: 20px; border-radius: 50%;
  background: var(--amber); color: #2a1c00; font-size: 12px; font-weight: 700;
}
.pair-empty { color: var(--muted); font-size: 14px; margin: 0; }
.match-tally { color: var(--muted); font-size: 14px; margin: 16px 0 0; }
.match-tally.done { color: var(--green); }

@keyframes chip-drop {
  0% { transform: translateY(-6px) scale(.94); opacity: 0; }
  100% { transform: translateY(0) scale(1); opacity: 1; }
}
.tile {
  background: rgba(18, 32, 49, .5); border: 1px solid var(--line); color: inherit;
  border-radius: 12px; padding: 13px 16px; font: inherit; text-align: left; cursor: pointer;
}
.tile:hover:not(:disabled) { border-color: var(--muted); }
.tile.picked { border-color: var(--amber); background: #2b2a17; }
.tile.paired { border-color: var(--green); background: #123a2e; }
.tile.wrong { border-color: var(--red); background: #3a1c1c; }
.tile:disabled { cursor: default; }

.buckets { display: grid; gap: 12px; margin-top: 18px; }
.bucket {
  border: 1px dashed var(--line); border-radius: 14px; padding: 14px 16px; min-height: 76px;
  background: rgba(13, 23, 38, .5);
}
.bucket.picked { border-color: var(--amber); }
.bucket .label { color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: .08em; }
.bucket .items { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.bucket .placed { background: #24374f; border-radius: 999px; padding: 5px 12px; font-size: 14px; }
.bucket .placed.correct { background: #123a2e; border: 1px solid var(--green); }
.bucket .placed.wrong { background: #3a1c1c; border: 1px solid var(--red); }
.pool { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 6px; }

/* --------------------------------------------------------------- dragging */

/* touch-action: none stops a drag turning into a page scroll on a tablet. */
.draggable { touch-action: none; cursor: grab; }
.draggable:active { cursor: grabbing; }
.tile.dragging, .placed.dragging { opacity: .3; }

.drag-ghost {
  position: fixed; z-index: 60; pointer-events: none; max-width: 320px;
  transform: translate(-50%, -50%) rotate(-1.5deg);
  box-shadow: 0 16px 32px rgba(0, 0, 0, .4);
  opacity: .95; margin: 0;
}

.bucket.drop-active, .pool.drop-active {
  border-color: var(--amber); background: rgba(244, 183, 64, .09);
}
.tile.drop-active, .placed.drop-active { border-color: var(--amber); box-shadow: 0 0 0 2px rgba(244, 183, 64, .35); }
.placed { cursor: grab; }

.order { display: grid; gap: 10px; }
.order-row {
  display: flex; align-items: center; gap: 12px; background: rgba(18, 32, 49, .5);
  border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; cursor: grab;
}
.order-row.picked { border-color: var(--amber); background: #2b2a17; }
.order-row .handle { color: var(--muted); font-variant-numeric: tabular-nums; width: 20px; }
.order-row .moves { margin-left: auto; display: flex; gap: 6px; }
.order-row .moves button {
  background: #24374f; border: none; color: var(--text); border-radius: 8px;
  width: 30px; height: 30px; cursor: pointer; font: inherit;
}
.order-row .moves button:hover { background: #2f4a6b; }

.score { font-size: 44px; font-weight: 700; color: var(--amber); margin: 0 0 6px; }
.breakdown { width: 100%; border-collapse: collapse; margin-top: 14px; }
.breakdown td { padding: 8px 0; border-bottom: 1px solid var(--line); }
.breakdown td:last-child { text-align: right; color: var(--muted); font-variant-numeric: tabular-nums; }

.foot {
  margin-top: 26px; color: var(--muted); font-size: 13px; text-align: center;
}

.ghost.link {
  border: none; padding: 2px 4px; text-decoration: underline;
  text-underline-offset: 3px; color: var(--muted); font-size: 13px;
}
.ghost.link:hover { color: var(--amber); }

.note {
  margin-top: 18px; padding: 16px 18px; border-radius: 14px;
  background: rgba(13, 23, 38, .55); border: 1px solid var(--line);
}
.note p { margin: 0 0 10px; font-size: 14.5px; color: #cfdcea; }
.note p:last-child { margin-bottom: 0; }
.note a { color: var(--amber); }

@media (max-width: 560px) {
  .pairs { grid-template-columns: 1fr; }
  .panel { padding: 22px; }
  h1 { font-size: 22px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

/* ---------------------------------------------------------------- ambience */

/* A slow, soft light behind everything. It moves over about a minute, which is
   slow enough to read as calm rather than as motion. */
body::before {
  content: "";
  position: fixed;
  inset: -20% -10%;
  background:
    radial-gradient(42% 38% at 18% 22%, rgba(69, 208, 147, .10), transparent 70%),
    radial-gradient(46% 42% at 82% 12%, rgba(244, 183, 64, .10), transparent 72%);
  animation: ambient 64s ease-in-out infinite alternate;
  pointer-events: none;
  z-index: 0;
}

@keyframes ambient {
  from { transform: translate3d(-1.5%, -1%, 0) scale(1); }
  to { transform: translate3d(1.5%, 1.5%, 0) scale(1.05); }
}

.app { position: relative; z-index: 1; }

/* ------------------------------------------------------------- calm polish */

.panel {
  border-color: #26384f;
  box-shadow: 0 22px 48px rgba(0, 0, 0, .26);
  transition: box-shadow 400ms ease, transform 400ms ease;
}

body { line-height: 1.6; }

.option, .tile, .module, .card-flip, .order-row, .bucket {
  transition: background-color 240ms ease, border-color 240ms ease, transform 240ms ease;
}

.option:hover:not(:disabled), .tile:hover:not(:disabled), .module:hover:not(:disabled) {
  transform: translateY(-1px);
}

.option.correct, .tile.paired { animation: settle 520ms ease; }

@keyframes settle {
  0% { transform: scale(1); }
  40% { transform: scale(1.015); }
  100% { transform: scale(1); }
}

.pip { transition: background-color 420ms ease, flex-grow 320ms ease; }
.pip.now { animation: pip-breathe 2.6s ease-in-out infinite; }

@keyframes pip-breathe {
  0%, 100% { opacity: 1; }
  50% { opacity: .55; }
}

.chip b { transition: color 300ms ease; }
.chip.bump { animation: chip-bump 700ms ease; }

@keyframes chip-bump {
  0% { transform: scale(1); }
  35% { transform: scale(1.12); }
  100% { transform: scale(1); }
}

.screen-enter { animation: screen-enter 380ms cubic-bezier(.22, .8, .3, 1) both; }

@keyframes screen-enter {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.meter { height: 4px; border-radius: 3px; background: rgba(43, 63, 92, .7); overflow: hidden; }
.meter span {
  display: block; height: 100%; border-radius: 3px;
  background: linear-gradient(90deg, #45d093, #f4b740);
  transition: width 520ms cubic-bezier(.22, .8, .3, 1);
}

.module .bar { display: block; height: 4px; border-radius: 3px; background: rgba(43, 63, 92, .8); margin-top: 8px; }
.module .bar i { display: block; height: 100%; border-radius: 3px; background: #45d093; transition: width 600ms ease; }

/* ------------------------------------------------------------ flip the card */

.flip { perspective: 1200px; width: 100%; min-height: 208px; }
.flip-inner {
  position: relative; width: 100%; min-height: 208px;
  transform-style: preserve-3d; transition: transform 620ms cubic-bezier(.3, .8, .3, 1);
}
.flip.is-flipped .flip-inner { transform: rotateY(180deg); }
.flip-face {
  position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden;
  display: grid; place-items: center; text-align: center; padding: 28px;
  background: rgba(18, 32, 49, .5); border: 1px solid var(--line); border-radius: 18px;
  font-size: 20px; cursor: pointer;
}
.flip-back { transform: rotateY(180deg); border-color: #3a5573; background: rgba(24, 42, 63, .72); }
.flip .hint { display: block; color: var(--muted); font-size: 14px; margin-top: 12px; }

/* --------------------------------------------------------------------- Pip */

.pet-stage {
  position: fixed; right: 30px; bottom: 28px; width: 168px;
  display: flex; flex-direction: column-reverse; align-items: center; gap: 10px;
  pointer-events: none; z-index: 30;
}

.pet {
  width: 146px; height: 146px; transform-origin: 50% 88%;
  background: none; border: none; padding: 0; cursor: pointer; pointer-events: auto;
}
.pet:hover .pet-shape { fill: #ffc85a; }
.pet:focus-visible { outline: 2px solid var(--amber); outline-offset: 6px; border-radius: 50%; }
.pet-shape { transition: fill 260ms ease; }
.pet[data-level="2"] { transform: scale(1.04); }
.pet[data-level="3"] { transform: scale(1.08); }
.pet[data-level="4"] { transform: scale(1.12); }
.pet[data-level="5"], .pet[data-level="6"] { transform: scale(1.16); }

.pet-svg { width: 100%; height: 100%; overflow: visible; }

.pet-shadow { fill: rgba(0, 0, 0, .3); }
.pet-shape { fill: #f4b740; }
.pet-belly { fill: #fdf2d8; }
.pet-eye { fill: #16233a; }
.pet-pupil { fill: #f7fbff; }
.pet-beak { fill: #d98524; }
.pet-cheek { fill: #ef8a72; opacity: .55; }
.pet-foot, .pet-arm { fill: none; stroke: #d98524; stroke-width: 5; stroke-linecap: round; }
.pet-antenna { stroke: #7fd8c0; stroke-width: 3.4; stroke-linecap: round; }
.pet-tip { fill: #45d093; }
.pet-happy-eyes { display: none; fill: none; stroke: #16233a; stroke-width: 3.4; stroke-linecap: round; }
.pet-body { animation: pet-bob 4.2s ease-in-out infinite; transform-origin: 50% 90%; }
.pet-eyes { animation: pet-blink 5.4s ease-in-out infinite; transform-origin: 60px 53px; }
.pet-tip { animation: pet-tip 2.6s ease-in-out infinite; transform-origin: 60px 13px; }

@keyframes pet-bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

@keyframes pet-blink {
  0%, 90%, 100% { transform: scaleY(1); }
  93% { transform: scaleY(.08); }
  96% { transform: scaleY(1); }
}

@keyframes pet-tip {
  0%, 100% { opacity: .55; transform: scale(.9); }
  50% { opacity: 1; transform: scale(1.12); }
}

.pet-thinking .pet-body { animation: pet-lean 3.4s ease-in-out infinite; }
.pet-thinking .pet-tip { animation-duration: 1.5s; }

@keyframes pet-lean {
  0%, 100% { transform: rotate(0deg); }
  50% { transform: rotate(-2.6deg); }
}

.pet-happy .pet-body, .pet-celebrate .pet-body { animation: pet-hop 520ms cubic-bezier(.3, .9, .3, 1) 3; }
.pet-happy .pet-eyes, .pet-celebrate .pet-eyes { display: none; }
.pet-happy .pet-happy-eyes, .pet-celebrate .pet-happy-eyes { display: block; }
.pet-happy .pet-tip, .pet-celebrate .pet-tip { fill: #ffe08a; }
.pet-celebrate .pet-body { animation: pet-hop 480ms cubic-bezier(.3, .9, .3, 1) 5; }

@keyframes pet-hop {
  0% { transform: translateY(0) scale(1, 1); }
  35% { transform: translateY(-15px) scale(.96, 1.06); }
  70% { transform: translateY(0) scale(1.05, .95); }
  100% { transform: translateY(0) scale(1, 1); }
}

.pet-encourage .pet-body { animation: pet-soften 1.8s ease-in-out 2; }
.pet-encourage .pet-tip { fill: #ff9f8a; }

@keyframes pet-soften {
  0%, 100% { transform: rotate(0deg); }
  30% { transform: rotate(2.4deg) translateY(2px); }
  70% { transform: rotate(-1.4deg) translateY(1px); }
}

.pet-bubble {
  margin: 0; max-width: 200px; text-align: center;
  background: rgba(23, 38, 60, .94); border: 1px solid #2f4664; color: var(--text);
  border-radius: 14px; padding: 9px 13px; font-size: 13.5px; line-height: 1.4;
  opacity: 0; transform: translateY(6px); transition: opacity 260ms ease, transform 260ms ease;
}
.pet-bubble.is-on { opacity: 1; transform: translateY(0); }
.pet-line { display: block; }
.pet-aside {
  display: block; margin-top: 4px; font-size: 12.5px;
  color: var(--muted); font-style: italic;
}

.pet-spark {
  position: absolute; left: 50%; top: 46%; width: 7px; height: 7px; border-radius: 50%;
  background: #ffe08a; box-shadow: 0 0 10px rgba(255, 224, 138, .8);
  animation: spark-fly 820ms cubic-bezier(.2, .7, .3, 1) forwards;
}

@keyframes spark-fly {
  from { transform: translate(0, 0) scale(1); opacity: 1; }
  to { transform: translate(calc(var(--dx) * 62px), calc(var(--dy) * 62px)) scale(.15); opacity: 0; }
}

@media (max-width: 720px) {
  .pet-stage { right: 12px; bottom: 10px; width: 122px; }
  .pet { width: 104px; height: 104px; }
  .pet-bubble { font-size: 12.5px; max-width: 150px; }
}

/* On a phone the companion sits over the module list, so it steps back. */
@media (max-width: 520px) {
  .pet-stage { right: 8px; bottom: 8px; width: 94px; }
  .pet { width: 82px; height: 82px; opacity: .9; }
  .pet-bubble { font-size: 12px; max-width: 128px; padding: 7px 10px; }
}

@media (prefers-reduced-motion: reduce) {
  body::before, .pet-body, .pet-eyes, .pet-tip, .pip.now { animation: none !important; }
  .pet-spark { display: none; }
  .flip-inner { transition: none; }
}