/* Topographic map palette: paper, woodland tint, contour brown, ink, trail blaze. */
:root {
  --paper: #ffffff;
  --woodland: #d9e8c4;
  --woodland-ink: #2c4a1e;
  --contour: #9a5b32;
  --ink: #1a1a1a;
  --soft: #5d625a;
  --rule: #c9d3bd;
  --blaze: #f2600c;
  --dock: rgb(255 255 255 / 0.94);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #171a17;
    --woodland: #24321d;
    --woodland-ink: #cfe3b8;
    --contour: #d39a6d;
    --ink: #f1f3ee;
    --soft: #a6ad9f;
    --rule: #34402c;
    --blaze: #ff7a2e;
    --dock: rgb(23 26 23 / 0.94);
  }
}
:root[data-theme="dark"] {
  --paper: #171a17;
  --woodland: #24321d;
  --woodland-ink: #cfe3b8;
  --contour: #d39a6d;
  --ink: #f1f3ee;
  --soft: #a6ad9f;
  --rule: #34402c;
  --blaze: #ff7a2e;
  --dock: rgb(23 26 23 / 0.94);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Archivo, system-ui, sans-serif;
  font-size: 1rem;
  line-height: 1.5;
}
main {
  max-width: 34rem;
  margin: 0 auto;
  padding: 20px 16px 120px;
}
a { color: inherit; text-underline-offset: 2px; }

/* ---------- header ---------- */
.top {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
}
h1 {
  margin: 0;
  font-size: clamp(2.2rem, 10vw, 3rem);
  font-weight: 800;
  font-stretch: 62%;
  line-height: 0.9;
  letter-spacing: -0.01em;
}
.code-chip {
  flex: none;
  font: inherit;
  font-size: 0.875rem;
  color: var(--soft);
  background: none;
  border: 1.5px solid var(--rule);
  border-radius: 6px;
  padding: 6px 10px;
  cursor: pointer;
}
.code-chip strong { color: var(--ink); font-stretch: 85%; letter-spacing: 0.02em; }
.meta {
  margin: 10px 0 16px;
  color: var(--soft);
  font-size: 0.9375rem;
}

/* ---------- photo checker download ---------- */
.kit {
  border-left: 4px solid var(--contour);
  padding: 2px 0 2px 14px;
  margin: 0 0 20px;
}
.kit p { margin: 0 0 10px; font-size: 0.9375rem; max-width: 60ch; }
.kit progress { width: 100%; height: 6px; margin: 0 0 10px; accent-color: var(--woodland-ink); }
.kit.ready { border-left-color: var(--woodland-ink); }
.kit.ready p { margin: 0; color: var(--soft); }

/* ---------- the card ---------- */
.map {
  display: grid;
  grid-template-columns: 18px 1fr;
  grid-template-rows: 18px auto;
  gap: 4px;
}
.refs {
  display: grid;
  color: var(--contour);
  font-size: 0.75rem;
  font-weight: 700;
  font-stretch: 75%;
  place-items: center;
}
.refs.cols { grid-column: 2; grid-template-columns: repeat(var(--n), 1fr); column-gap: 4px; }
.refs.rows { grid-column: 1; grid-row: 2; grid-template-rows: repeat(var(--n), 1fr); row-gap: 4px; }

.board {
  grid-column: 2;
  grid-row: 2;
  position: relative;
  border: 2px solid var(--ink);
  border-radius: 4px;
  padding: 4px;
}
.grid {
  container-type: inline-size;
  display: grid;
  grid-template-columns: repeat(var(--n), 1fr);
  gap: 4px;
}
.cell {
  position: relative;
  aspect-ratio: 1;
  border: 0;
  border-radius: 2px;
  background: var(--woodland);
  color: var(--woodland-ink);
  padding: 8px;
  display: flex;
  align-items: flex-end;
  text-align: left;
  overflow: hidden;
  cursor: pointer;
  font: inherit;
}
.cell .label {
  /* Scales with the card itself, so labels stay in proportion at any screen size. */
  font-size: clamp(0.72rem, calc(13cqi / var(--n)), 1.5rem);
  font-weight: 700;
  font-stretch: 75%;
  line-height: 1.05;
}
.grid[data-n="5"] .cell { padding: 5px; }
.cell.center {
  background:
    repeating-linear-gradient(135deg, transparent 0 7px, rgb(44 74 30 / 0.14) 7px 8px),
    var(--woodland);
  box-shadow: inset 0 0 0 2px var(--woodland-ink);
}
.cell.found { padding: 0; background: var(--ink); }
.cell.found img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.cell.found .label {
  position: relative;
  width: 100%;
  padding: 14px 6px 5px;
  color: #fff;
  background: linear-gradient(transparent, rgb(0 0 0 / 0.7));
}
.cell:focus-visible, .btn:focus-visible, .code-chip:focus-visible, summary:focus-visible, input:focus-visible, select:focus-visible {
  outline: 3px solid var(--blaze);
  outline-offset: 2px;
}

/* Bingo route: the one loud element on the page. */
.route {
  position: absolute;
  inset: 4px;
  width: calc(100% - 8px);
  height: calc(100% - 8px);
  pointer-events: none;
  overflow: visible;
}
.route line {
  stroke: var(--blaze);
  stroke-width: 0.11;
  stroke-linecap: round;
  opacity: 0.92;
}
.route line.new {
  stroke-dasharray: 10;
  stroke-dashoffset: 10;
  animation: draw 0.9s cubic-bezier(0.3, 0.7, 0.2, 1) 0.15s forwards;
}
@keyframes draw { to { stroke-dashoffset: 0; } }

/* ---------- text sections ---------- */
.how { margin: 32px 0 8px; max-width: 60ch; }
.how h2, .setup summary {
  font-size: 1.25rem;
  font-weight: 800;
  font-stretch: 75%;
  margin: 0 0 8px;
}
.how p { margin: 0 0 10px; color: var(--soft); }

.setup { border-top: 1.5px solid var(--rule); margin-top: 24px; padding-top: 16px; }
.setup summary { cursor: pointer; margin: 0; }
.fields { display: grid; gap: 6px; margin: 16px 0; }
.fields label { font-weight: 600; font-size: 0.9375rem; margin-top: 8px; }
.help { margin: 0; color: var(--soft); font-size: 0.875rem; }
input, select {
  font: inherit;
  min-height: 44px;
  padding: 8px 12px;
  border-radius: 4px;
  border: 1.5px solid var(--rule);
  background: var(--paper);
  color: var(--ink);
}

footer {
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1.5px solid var(--rule);
  font-size: 0.875rem;
  color: var(--soft);
  max-width: 60ch;
}

/* ---------- buttons + dock ---------- */
.btn {
  font: inherit;
  font-weight: 700;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 6px;
  border: 2px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  cursor: pointer;
}
.btn.line { background: transparent; color: var(--ink); }
.btn.primary { font-size: 1.0625rem; }
.btn:active { transform: translateY(1px); }

.dock {
  position: fixed;
  inset: auto 0 0;
  display: flex;
  gap: 10px;
  justify-content: center;
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
  background: var(--dock);
  border-top: 1.5px solid var(--rule);
  backdrop-filter: blur(8px);
}
.dock .primary { flex: 1; max-width: 26rem; min-height: 54px; }

/* ---------- result sheet ---------- */
dialog {
  width: min(100vw, 30rem);
  max-width: 100vw;
  margin: auto auto 0;
  padding: 0;
  border: 0;
  border-radius: 12px 12px 0 0;
  background: var(--paper);
  color: var(--ink);
  overflow: hidden;
}
@media (min-width: 640px) {
  dialog { margin: auto; border-radius: 10px; }
}
dialog::backdrop { background: rgb(0 0 0 / 0.55); }
dialog img { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; background: var(--woodland); }
.sheet-body { padding: 18px 20px calc(20px + env(safe-area-inset-bottom)); }
dialog h2 {
  margin: 0 0 6px;
  font-size: 1.75rem;
  font-weight: 800;
  font-stretch: 70%;
  line-height: 1.05;
}
dialog p { margin: 0 0 18px; color: var(--soft); }
dialog .btn { width: 100%; }
dialog.celebrate h2 { color: var(--blaze); font-size: 2.5rem; }

/* ---------- wide screens ----------
   Card on the right, sized to the screen height so it never needs scrolling.
   Text column on the left. */
@media (min-width: 900px) {
  main {
    max-width: 76rem;
    padding: 40px 32px 120px;
    display: grid;
    grid-template-columns: minmax(19rem, 25rem) 1fr;
    grid-template-rows: repeat(6, auto) 1fr;
    column-gap: 56px;
    align-items: start;
  }
  main > * { grid-column: 1; }
  .map {
    grid-column: 2;
    grid-row: 1 / -1;
    position: sticky;
    top: 32px;
    width: min(100%, calc(100svh - 150px));
    justify-self: center;
  }
  .top { flex-direction: column; align-items: flex-start; gap: 16px; }
  h1 { font-size: 4rem; }
  .how { margin-top: 12px; }
  .refs { font-size: 0.8125rem; }
}

@media (prefers-reduced-motion: reduce) {
  .route line.new { animation: none; stroke-dashoffset: 0; }
  .btn:active { transform: none; }
}