/* ==========================================================================
   홍철, the corner robot (_includes/robot.html, assets/js/robot.js).
   Pixel art throughout: the face is a 24 x 23 grid, the bubble has stepped
   pixel corners drawn with box-shadows, text is set in the Galmuri pixel
   font. Colours stay on the site's paper / ink / accent scheme.
   ========================================================================== */

.robot {
  --robot-accent: var(--course, var(--accent));
  --px: 3px;
  --pixel-font: "Galmuri14", "Galmuri11", var(--font-sans);
  position: fixed;
  right: max(16px, env(safe-area-inset-right));
  bottom: max(16px, env(safe-area-inset-bottom));
  z-index: 950;
}

/* keep the footer links out from under the robot */
.site-footer {
  padding-bottom: 7rem;
}

/* a pixel frame: four 1-pixel offsets leave the corners notched */
.robot__dialog,
.robot__name,
.robot__choice,
.robot__hint {
  --frame: var(--ink);
  --fw: var(--px);
  box-shadow:
    0 calc(var(--fw) * -1) 0 0 var(--frame),
    0 var(--fw) 0 0 var(--frame),
    calc(var(--fw) * -1) 0 0 0 var(--frame),
    var(--fw) 0 0 0 var(--frame);
}

/* -- the face ------------------------------------------------------------- */

.robot__button {
  display: block;
  width: 72px;
  height: 69px;
  padding: 0;
  background: none;
  filter: drop-shadow(3px 3px 0 color-mix(in srgb, var(--ink) 22%, transparent));
}

.robot__button:focus-visible {
  outline: var(--px) solid var(--robot-accent);
  outline-offset: 4px;
}

.robot__face {
  display: block;
  width: 100%;
  height: 100%;
  overflow: visible;
  animation: rf-bob 2.4s steps(1) infinite;
}

.rf-led {
  fill: var(--robot-accent);
  animation: rf-led 1.8s steps(1) infinite;
}

/* eye and mouth frames; the CSS swaps them like sprite frames */
.rf-eyes--open { animation: rf-open 4.6s steps(1) infinite; }
.rf-eyes--blink { opacity: 0; animation: rf-shut 4.6s steps(1) infinite; }
.rf-eyes--happy,
.rf-mouth--talk { opacity: 0; }

.robot__button:hover .rf-eyes--open,
.robot__button:hover .rf-eyes--blink,
.robot.is-open .rf-eyes--open,
.robot.is-open .rf-eyes--blink {
  opacity: 0;
  animation: none;
}

.robot__button:hover .rf-eyes--happy,
.robot.is-open .rf-eyes--happy {
  opacity: 1;
}

.robot.is-talking .rf-mouth--smile { animation: rf-frame-a 0.26s steps(1) infinite; }
.robot.is-talking .rf-mouth--talk { animation: rf-frame-b 0.26s steps(1) infinite; }

.robot__button:hover .robot__face { animation: rf-hop 0.5s steps(2) infinite; }

@keyframes rf-bob { 0% { transform: translateY(0); } 50% { transform: translateY(calc(var(--px) * -1)); } }
@keyframes rf-hop { 0% { transform: translateY(0); } 50% { transform: translateY(calc(var(--px) * -2)); } }
@keyframes rf-led { 0% { opacity: 1; } 50% { opacity: 0.3; } }
@keyframes rf-open { 0% { opacity: 1; } 92% { opacity: 0; } 96% { opacity: 1; } }
@keyframes rf-shut { 0% { opacity: 0; } 92% { opacity: 1; } 96% { opacity: 0; } }
@keyframes rf-frame-a { 0% { opacity: 1; } 50% { opacity: 0; } }
@keyframes rf-frame-b { 0% { opacity: 0; } 50% { opacity: 1; } }

/* "!" bubble that invites the first click */
.robot__hint {
  --fw: 2px;
  position: absolute;
  right: 60px;
  bottom: 66px;
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  background: var(--robot-accent);
  color: #fff;
  font-family: var(--pixel-font);
  font-size: 14px;
  line-height: 1;
  opacity: 0;
  pointer-events: none;
}

.robot.has-hint .robot__hint {
  opacity: 1;
  animation: rf-hop 1s steps(2) infinite;
}

/* -- the speech bubble --------------------------------------------------------- */

.robot__dialog {
  position: absolute;
  right: 6px;
  bottom: calc(100% + 26px);
  width: min(22rem, calc(100vw - 44px));
  padding: 22px 16px 14px;
  background: var(--card);
  color: var(--ink);
  font-family: var(--pixel-font);
  font-size: 14px;
  line-height: 1.75;
  box-shadow:
    0 calc(var(--px) * -1) 0 0 var(--ink),
    0 var(--px) 0 0 var(--ink),
    calc(var(--px) * -1) 0 0 0 var(--ink),
    var(--px) 0 0 0 var(--ink),
    inset 0 calc(var(--px) * -1) 0 0 color-mix(in srgb, var(--ink) 8%, transparent),
    calc(var(--px) * 3) calc(var(--px) * 3) 0 0 color-mix(in srgb, var(--ink) 15%, transparent);
  animation: robot-pop 0.24s steps(3);
}

.robot__dialog[hidden] {
  display: none;
}

.robot__dialog:focus {
  outline: none;
}

@keyframes robot-pop {
  0% { opacity: 0; transform: translateY(calc(var(--px) * 3)); }
  100% { opacity: 1; transform: none; }
}

.robot__tail {
  position: absolute;
  top: 100%;
  right: 22px;
  width: calc(var(--px) * 6);
  height: calc(var(--px) * 5);
  overflow: visible;
}

.robot__tail-ink { fill: var(--ink); }
.robot__tail-fill { fill: var(--card); }

.robot__name {
  --fw: 2px;
  position: absolute;
  top: -14px;
  left: 12px;
  padding: 1px 8px 0;
  background: var(--robot-accent);
  color: #fff;
  font-size: 14px;
  line-height: 1.6;
  white-space: nowrap;
}

.robot__name small {
  font-size: inherit;
  opacity: 0.85;
}

.robot__close {
  position: absolute;
  top: 6px;
  right: 8px;
  width: 22px;
  height: 22px;
  font-family: var(--pixel-font);
  font-size: 14px;
  line-height: 1;
  color: var(--ink-muted);
}

.robot__close:hover,
.robot__close:focus-visible {
  color: #fff;
  background: var(--robot-accent);
  outline: none;
}

.robot__text {
  min-height: 3.5em;
  margin: 0;
  padding-right: 14px;
  word-break: keep-all;
  cursor: pointer;
}

.robot__text::after {
  content: "";
  display: inline-block;
  width: 7px;
  height: 14px;
  margin-left: 3px;
  vertical-align: -2px;
  background: var(--robot-accent);
  animation: rf-frame-a 0.7s steps(1) infinite;
}

.robot__dialog:not(.is-typing) .robot__text::after {
  display: none;
}

.robot__more {
  display: block;
  height: 14px;
  text-align: right;
  line-height: 1;
}

.robot__dialog.is-done .robot__more::after {
  content: "\25BC";
  display: inline-block;
  color: var(--robot-accent);
  animation: rf-hop 0.8s steps(2) infinite;
}

/* -- choices: a game menu ---------------------------------------------------- */

.robot__choices {
  display: grid;
  gap: 9px;
  margin-top: 8px;
  padding: 2px;
  max-height: 46vh;
  overflow-y: auto;
  visibility: hidden;
}

.robot__dialog.is-done .robot__choices {
  visibility: visible;
}

.robot__choices--row {
  grid-template-columns: repeat(auto-fit, minmax(7rem, 1fr));
}

.robot__choice {
  --frame: var(--rule);
  --fw: 2px;
  position: relative;
  display: block;
  width: 100%;
  padding: 6px 10px 5px 26px;
  border: 0;
  border-radius: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--pixel-font);
  font-size: 14px;
  line-height: 1.5;
  text-align: left;
  text-decoration: none;
}

.robot__choice::before {
  content: "\25B6";
  position: absolute;
  left: 9px;
  top: 6px;
  color: var(--robot-accent);
  visibility: hidden;
}

.robot__choice:hover,
.robot__choice:focus-visible {
  --frame: var(--ink);
  background: color-mix(in srgb, var(--robot-accent) 14%, var(--bg));
  outline: none;
}

.robot__choice:hover::before,
.robot__choice:focus-visible::before {
  visibility: visible;
  animation: rf-frame-a 0.6s steps(1) infinite;
}

.robot__choice:active {
  transform: translate(1px, 1px);
}

.robot__choice--primary {
  --frame: var(--ink);
  background: var(--robot-accent);
  color: #fff;
}

.robot__choice--primary::before {
  color: #fff;
}

.robot__choice--primary:hover,
.robot__choice--primary:focus-visible {
  background: color-mix(in srgb, var(--robot-accent) 82%, #000);
}

.robot__choice--quiet {
  background: transparent;
  color: var(--ink-muted);
}

/* -- small screens and motion ------------------------------------------------------ */

@media (max-width: 560px) {
  .robot__button {
    width: 48px;
    height: 46px;
  }

  .robot__hint {
    right: 38px;
    bottom: 44px;
  }

  .robot__dialog {
    right: -2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .robot *,
  .robot__dialog {
    animation: none !important;
  }
}

@media print {
  .robot { display: none; }
}