/* ============================================================
   QR Generator — scoped to .qrg* so it can't collide with site.css.
   Loaded only on the lab entry template. Light-themed island
   inside the dark editorial page chrome.
   ============================================================ */

/* Outfit, loaded via Google Fonts for design fidelity with the
   Frontend Mentor source. (Self-host if we keep the lab long-term.) */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700&display=swap');

.qrg {
  /* Colors — Figma style guide */
  --slate-900: rgb(31, 49, 79);
  --slate-700: rgb(74, 90, 116);
  --slate-500: rgb(104, 119, 141);
  --slate-400: rgb(163, 178, 199);
  --slate-300: rgb(213, 225, 239);
  --slate-200: rgb(230, 237, 247);
  --slate-100: rgb(242, 246, 252);
  --blue-500: rgb(44, 125, 250);
  --blue-400: rgb(54, 133, 255);
  --blue-600: rgb(30, 100, 220);
  --white: #ffffff;

  /* Fluid card sizing — same system as the static challenge:
     every metric is a fraction of --card-w so the whole card
     scales as one block. Anchored to Figma's 320px reference. */
  --card-w: clamp(19rem, 17rem + 8vw, 26rem);

  --card-radius: calc(var(--card-w) * 20 / 320);
  --card-pad-x:  calc(var(--card-w) * 16 / 320);
  --card-pad-t:  calc(var(--card-w) * 16 / 320);
  --card-pad-b:  calc(var(--card-w) * 28 / 320);
  --card-gap:    calc(var(--card-w) * 20 / 320);

  --qr-radius:   calc(var(--card-w) * 10 / 320);

  --text-pad-x:  calc(var(--card-w) * 16 / 320);
  --text-gap:    calc(var(--card-w) * 14 / 320);

  --title-size:  calc(var(--card-w) * 22 / 320);
  --body-size:   calc(var(--card-w) * 15 / 320);
  --label-size:  calc(var(--card-w) * 12 / 320);
  --btn-size:    calc(var(--card-w) * 14 / 320);
  --body-track:  calc(var(--card-w) * 0.188 / 320);

  --ctrl-radius: calc(var(--card-w) * 10 / 320);
  --ctrl-pad-x:  calc(var(--card-w) * 14 / 320);
  --ctrl-pad-y:  calc(var(--card-w) * 12 / 320);

  --shadow-y:    calc(var(--card-w) * 25 / 320);
  --shadow-blur: calc(var(--card-w) * 25 / 320);
  --card-shadow: 0 var(--shadow-y) var(--shadow-blur) rgba(0, 0, 0, 0.0477);

  --page-gutter-qrg: clamp(2rem, 4vw, 4rem);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);

  position: relative;
  overflow: hidden;
  background: var(--slate-300);
  color: var(--slate-900);
  font-family: "Outfit", system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  min-height: 80vh;
  display: grid;
  place-items: center;
  padding: var(--page-gutter-qrg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Soft background glow echoing the QR ornaments */
.qrg::before, .qrg::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.35;
  pointer-events: none;
  z-index: 0;
}
.qrg::before {
  width: 60vmin; height: 60vmin;
  background: rgb(54, 133, 255);
  left: -12vmin; top: -12vmin;
}
.qrg::after {
  width: 50vmin; height: 50vmin;
  background: rgb(255, 255, 255);
  right: -10vmin; bottom: -10vmin;
}

/* Inner stage — sits above the body::before/::after glows */
.qrg-stage {
  position: relative;
  z-index: 1;
  width: 100%;
  display: grid;
  place-items: center;
}

.qrg *, .qrg *::before, .qrg *::after { box-sizing: border-box; }

/* ───────────── Card ───────────── */
.qrg .card {
  position: relative;
  width: var(--card-w);
  max-width: 100%;
  background: var(--white);
  border-radius: var(--card-radius);
  padding: var(--card-pad-t) var(--card-pad-x) var(--card-pad-b);
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  gap: var(--card-gap);
}

/* Two "faces" (input + result) crossfade + slide in place */
.qrg .face {
  display: flex;
  flex-direction: column;
  gap: var(--card-gap);
  transition: opacity 320ms var(--ease), transform 320ms var(--ease);
}
.qrg .face[hidden] { display: none !important; }
.qrg .face.enter-from-right { transform: translateX(8%); opacity: 0; }
.qrg .face.enter-from-left  { transform: translateX(-8%); opacity: 0; }
.qrg .face.enter-active     { transform: translateX(0); opacity: 1; }

/* ───────────── QR tile ───────────── */
.qrg .qr {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: var(--qr-radius);
  overflow: hidden;
  background: var(--blue-500);
  display: grid;
  place-items: center;
  isolation: isolate;
}
.qrg .qr::before, .qrg .qr::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  background: var(--blue-400);
  pointer-events: none;
  z-index: 0;
}
.qrg .qr::before {
  width: 114%; height: 114%;
  left: -46%; top: -57%;
}
.qrg .qr::after {
  width: 94%; height: 94%;
  right: -48%; bottom: -33%;
}

.qrg .qr-svg {
  position: relative;
  z-index: 1;
  width: 56%;
  height: 56%;
  display: block;
  shape-rendering: crispEdges;
  transition: opacity 240ms var(--ease), transform 240ms var(--ease);
}
.qrg .qr-svg.updating { opacity: 0.4; transform: scale(0.96); }
.qrg .qr.placeholder .qr-svg { opacity: 0.35; }

/* ───────────── Typography ───────────── */
.qrg .title {
  margin: 0;
  font-weight: 700;
  font-size: var(--title-size);
  line-height: 1.2;
  color: var(--slate-900);
  text-align: center;
}
.qrg .subtitle {
  margin: 0;
  font-weight: 400;
  font-size: var(--body-size);
  line-height: 1.4;
  letter-spacing: var(--body-track);
  color: var(--slate-500);
  text-align: center;
}
.qrg .text-block {
  padding-inline: var(--text-pad-x);
  display: flex;
  flex-direction: column;
  gap: calc(var(--card-w) * 8 / 320);
}

/* ───────────── Form controls ───────────── */
.qrg .field {
  display: flex;
  flex-direction: column;
  gap: calc(var(--card-w) * 6 / 320);
}
.qrg .field-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--label-size);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--slate-500);
}
.qrg .field-label .count {
  font-variant-numeric: tabular-nums;
  color: var(--slate-400);
  font-weight: 500;
  text-transform: none;
  letter-spacing: 0;
}
.qrg .field-label .count.warn { color: rgb(220, 100, 70); }

.qrg .input, .qrg .textarea {
  width: 100%;
  font: inherit;
  color: var(--slate-900);
  background: var(--slate-100);
  border: 1.5px solid transparent;
  border-radius: var(--ctrl-radius);
  padding: var(--ctrl-pad-y) var(--ctrl-pad-x);
  font-size: var(--body-size);
  line-height: 1.4;
  outline: none;
  transition: border-color 160ms var(--ease), background 160ms var(--ease), box-shadow 160ms var(--ease);
  resize: none;
}
.qrg .textarea {
  min-height: calc(var(--card-w) * 96 / 320);
  font-family: inherit;
}
.qrg .input::placeholder, .qrg .textarea::placeholder { color: var(--slate-400); }
.qrg .input:hover, .qrg .textarea:hover { background: var(--white); border-color: var(--slate-200); }
.qrg .input:focus, .qrg .textarea:focus {
  background: var(--white);
  border-color: var(--blue-500);
  box-shadow: 0 0 0 4px rgba(44, 125, 250, 0.12);
}

/* Preset chips */
.qrg .chips {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--card-w) * 6 / 320);
}
.qrg .chip {
  font: inherit;
  font-size: var(--label-size);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--slate-500);
  background: var(--slate-100);
  border: 1.5px solid transparent;
  padding: calc(var(--card-w) * 6 / 320) calc(var(--card-w) * 10 / 320);
  border-radius: 999px;
  cursor: pointer;
  transition: all 160ms var(--ease);
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
}
.qrg .chip:hover { background: var(--white); color: var(--slate-900); border-color: var(--slate-200); }
.qrg .chip[aria-pressed="true"] {
  background: var(--blue-500);
  color: var(--white);
  border-color: var(--blue-500);
}
.qrg .chip svg { width: 1em; height: 1em; }

/* Buttons */
.qrg .actions {
  display: flex;
  gap: calc(var(--card-w) * 8 / 320);
}
.qrg .btn {
  flex: 1;
  font: inherit;
  font-size: var(--btn-size);
  font-weight: 600;
  letter-spacing: 0.01em;
  padding: var(--ctrl-pad-y) var(--ctrl-pad-x);
  border-radius: var(--ctrl-radius);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all 160ms var(--ease);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  min-height: calc(var(--card-w) * 44 / 320);
  white-space: nowrap;
}
.qrg .btn svg { width: 1.15em; height: 1.15em; }
.qrg .btn-primary {
  background: var(--slate-900);
  color: var(--white);
}
.qrg .btn-primary:hover { background: rgb(47, 66, 96); transform: translateY(-1px); }
.qrg .btn-primary:active { transform: translateY(0); }
.qrg .btn-primary[disabled] { background: var(--slate-400); cursor: not-allowed; transform: none; }

.qrg .btn-secondary {
  background: var(--slate-100);
  color: var(--slate-900);
}
.qrg .btn-secondary:hover { background: var(--slate-200); }

.qrg .btn-ghost {
  background: transparent;
  color: var(--slate-500);
  border-color: var(--slate-200);
}
.qrg .btn-ghost:hover { color: var(--slate-900); border-color: var(--slate-300); }

.qrg .btn.flash {
  background: rgb(73, 165, 120);
  color: var(--white);
  border-color: rgb(73, 165, 120);
}

/* Result face — QR encoded value preview */
.qrg .encoded {
  padding: calc(var(--card-w) * 10 / 320) var(--text-pad-x);
  background: var(--slate-100);
  border-radius: var(--ctrl-radius);
  font-size: var(--label-size);
  color: var(--slate-700);
  word-break: break-all;
  text-align: center;
  line-height: 1.4;
  max-height: calc(var(--card-w) * 64 / 320);
  overflow-y: auto;
}
.qrg .encoded:empty::before {
  content: "—";
  color: var(--slate-400);
}

/* Segmented control (error correction) */
.qrg .seg {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--slate-100);
  border-radius: var(--ctrl-radius);
  padding: 3px;
  gap: 0;
}
.qrg .seg button {
  font: inherit;
  font-size: var(--label-size);
  font-weight: 600;
  color: var(--slate-500);
  background: transparent;
  border: none;
  border-radius: calc(var(--ctrl-radius) - 3px);
  padding: calc(var(--card-w) * 6 / 320) 0;
  cursor: pointer;
  transition: all 160ms var(--ease);
}
.qrg .seg button:hover { color: var(--slate-900); }
.qrg .seg button[aria-pressed="true"] {
  background: var(--white);
  color: var(--slate-900);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

/* Help row under the textarea */
.qrg .help {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1em;
  font-size: var(--label-size);
  color: var(--slate-500);
}
.qrg .help button {
  font: inherit;
  font-size: inherit;
  color: var(--blue-500);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}
.qrg .help button:hover { color: var(--blue-600); text-decoration: underline; }

/* Toast — fixed-positioned at viewport, sits outside .qrg layout */
.qrg-toast {
  position: fixed;
  left: 50%;
  bottom: 2rem;
  transform: translate(-50%, 120%);
  background: rgb(31, 49, 79);
  color: #ffffff;
  padding: 0.75em 1.25em;
  border-radius: 999px;
  font-family: "Outfit", system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  opacity: 0;
  transition: transform 280ms cubic-bezier(0.22, 1, 0.36, 1), opacity 280ms cubic-bezier(0.22, 1, 0.36, 1);
  pointer-events: none;
  z-index: 100;
}
.qrg-toast.show { transform: translate(-50%, 0); opacity: 1; }

/* Screen-reader only utility */
.qrg .sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

@media (prefers-reduced-motion: reduce) {
  .qrg *, .qrg *::before, .qrg *::after { transition: none !important; }
}