/* Constelly — styles.
   Theme: dots on a dark starfield. Colors are tokens so the feedback states stay consistent. */

:root {
  --bg: #0b1026;          /* night sky */
  --fg: #e8ecff;          /* text */
  --dot: #c9d1ff;         /* neutral dot */
  --line: #7f8bd6;        /* drawn line */
  --ok: #ffd84a;          /* dot evaluated correct / win state (bright yellow) */
  --bad: #ff5a5a;         /* dot evaluated wrong (red) */
  --hint: #e0c97a;        /* hinted line: locked, a paler gold than --ok */
  --muted: #5c6490;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

/* The page is exactly one screen tall during play: the board takes whatever height is left
   (see .board-wrap). Very short screens (landscape phones) scroll instead of shrinking it away. */
body {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  min-height: 100dvh; /* dvh: excludes mobile browser toolbars */
  padding: env(safe-area-inset-top) env(safe-area-inset-right)
           env(safe-area-inset-bottom) env(safe-area-inset-left);
}

/* ---- layout ---- */
.topbar {
  display: grid;
  grid-template-columns: 44px 1fr 44px;
  align-items: center;
  width: min(100%, 640px);
  margin: 0 auto;
  padding: 0.25rem 0.5rem 0;
  text-align: center;
}
.icon-btn {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-radius: 50%;
  cursor: pointer;
}
.icon-btn:hover { color: var(--fg); }
.icon-btn svg { width: 1.5rem; height: 1.5rem; fill: currentColor; }
.logo {
  margin: 0;
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}
.puzzle-num {
  font-weight: 400;
  color: var(--muted);
}
.stage {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 0.5rem;
}
.board-wrap {
  flex: 1 1 0;
  min-height: 300px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  container-type: size; /* lets #board size itself from the space left (cqw / cqh) */
}
.hud {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  width: min(100%, 640px);
  padding: 0.25rem 0.5rem;
  color: var(--muted);
}
.hud #timer { font-variant-numeric: tabular-nums; }
.hud button {
  font: inherit;
  color: var(--fg);
  background: transparent;
  border: 1px solid var(--muted);
  border-radius: 999px;
  min-height: 44px;
  padding: 0.3rem 1.1rem;
  cursor: pointer;
}
.hud button:disabled { opacity: 0.35; cursor: default; }
.reveal {
  margin: 0.4rem 0 0;
  font-size: 1.2rem;
  color: var(--ok);
  animation: fade-in 0.8s ease-out;
}
.controls {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  padding: 0.5rem 0;
}
/* Solved: the (disabled) controls make room for the title + "See results". */
.stage--solved .controls { display: none; }
.controls button,
.confirm button {
  font: inherit;
  color: var(--fg);
  background: transparent;
  border: 1px solid var(--muted);
  border-radius: 999px;
  min-height: 44px;
  min-width: 44px;
  padding: 0.3rem 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  cursor: pointer;
}
.controls svg { width: 1.3rem; height: 1.3rem; fill: currentColor; }
.controls button[aria-pressed="true"] {
  color: var(--bg);
  background: var(--fg);
  border-color: var(--fg);
}
.controls button:disabled { opacity: 0.35; cursor: default; }

.confirm {
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--muted);
  border-radius: 12px;
  max-width: min(90vw, 22rem);
}
.confirm::backdrop { background: rgb(0 0 0 / 0.6); }
.confirm p { margin: 0 0 1rem; }
.confirm-actions { display: flex; gap: 0.75rem; justify-content: flex-end; }
.confirm .danger { border-color: var(--bad); color: var(--bad); }

/* ---- results / help / stats dialogs ---- */
.dialog {
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--muted);
  border-radius: 14px;
  width: min(92vw, 24rem);
  max-height: 90vh;
  max-height: 90dvh;
  overflow-y: auto;
  padding: 1.25rem 1.25rem 1.5rem;
  text-align: center;
}
.dialog::backdrop { background: rgb(0 0 0 / 0.6); }
.dialog h2 { margin: 0 2.5rem 0.75rem; font-size: 1.25rem; font-weight: 600; }
.dialog p { margin: 0 0 0.75rem; line-height: 1.45; }
.dialog-close-form { position: absolute; top: 0.25rem; right: 0.25rem; margin: 0; }
.dialog-close {
  font: inherit;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--muted);
  background: transparent;
  border: 0;
  width: 44px;
  height: 44px;
  cursor: pointer;
}
.dialog-close:hover { color: var(--fg); }
.results-title { font-size: 1.15rem; color: var(--ok); }
.figures {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem 1.75rem;
  margin: 0.5rem 0 1rem;
}
.figures dt { font-size: 0.8rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }
.figures dd { margin: 0.15rem 0 0; font-size: 1.6rem; font-weight: 600; font-variant-numeric: tabular-nums; }
.results-next { color: var(--muted); font-variant-numeric: tabular-nums; }
.primary-btn {
  font: inherit;
  font-weight: 600;
  color: var(--bg);
  background: var(--ok);
  border: 0;
  border-radius: 999px;
  min-height: 44px;
  padding: 0.3rem 1.75rem;
  cursor: pointer;
}
.share-status { min-height: 1.45em; margin: 0.4rem 0 0.25rem; color: var(--ok); font-size: 0.9rem; }
.dialog--text #help-body { text-align: left; margin-bottom: 1rem; }
/* How-to-play: tutorial animation below the text on phones, beside it on wider screens. */
.help-demo { display: block; width: min(100%, 200px); margin: 0 auto 1rem; }
.help-demo img { display: block; width: 100%; height: auto; border-radius: 10px; }
@media (min-width: 640px) {
  .dialog--text { width: min(92vw, 40rem); }
  .help-layout {
    display: grid;
    grid-template-columns: 1fr 220px;
    gap: 1.25rem;
    align-items: center;
    margin-bottom: 1rem;
  }
  .help-layout #help-body,
  .help-layout .help-demo { width: 100%; margin: 0; }
}
.figures--stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(6rem, 1fr));
  gap: 1rem 0.5rem;
}
.figures--stats dd { font-size: 1.4rem; }
.history { margin-top: 1.25rem; text-align: left; }
.history h3 {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-align: center;
}
.history-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 14rem;
  overflow-y: auto;
  border-top: 1px solid var(--muted);
}
.history-row {
  display: grid;
  grid-template-columns: 3rem 1fr auto;
  gap: 0.5rem;
  align-items: baseline;
  padding: 0.45rem 0.25rem;
  border-bottom: 1px solid rgb(92 100 144 / 0.35);
  font-variant-numeric: tabular-nums;
}
.history-num { color: var(--muted); }
.history-row--solved .history-title { color: var(--ok); }
.history-row--missed .history-title,
.history-row--today .history-title { color: var(--muted); font-style: italic; }
.history-meta { color: var(--fg); font-size: 0.9rem; white-space: nowrap; }
.link-btn {
  font: inherit;
  color: var(--ok);
  background: transparent;
  border: 0;
  min-height: 44px;
  padding: 0 1rem;
  text-decoration: underline;
  text-underline-offset: 0.2em;
  cursor: pointer;
}
.footer { min-height: 1rem; }
.dialog-links { margin: 1rem 0 0; font-size: 0.85rem; }
.dialog-links a, .page a { color: var(--muted); text-underline-offset: 0.2em; }
.dialog-links a:hover, .page a:hover { color: var(--fg); }

/* ---- plain text pages (privacy.html) ---- */
.page {
  display: block;
  width: min(100%, 40rem);
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
  line-height: 1.55;
}
.page h1 { font-size: 1.5rem; margin: 0.5rem 0 0.25rem; }
.page h2 { font-size: 1.1rem; margin: 1.75rem 0 0.5rem; }
.page .updated { color: var(--muted); margin: 0 0 1.5rem; }
.page code { font-size: 0.9em; }

/* Portrait 3:4 board, as large as the space left in .board-wrap allows (capped on desktop).
   The first width is a fallback for browsers without container query units. */
#board {
  display: block;
  width: min(100vw - 1rem, (100vh - 11rem) * 0.75, 600px);
  width: min(100cqw, 75cqh, 600px);
  aspect-ratio: 3 / 4;
  margin: 0 auto;
  touch-action: none;     /* needed so drag-to-connect doesn't scroll the page on mobile */
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

/* ---- lines ---- */
.line {
  stroke: var(--line);
  stroke-width: 6;
  stroke-linecap: round;
  pointer-events: none;
  transition: stroke 0.4s;
}
.line--hinted { stroke: var(--hint); }
.line--flash { animation: line-flash 0.9s ease-out; }
@keyframes line-flash {
  0% { stroke-width: 22; opacity: 0.3; }
  100% { stroke-width: 6; opacity: 1; }
}
.line--shake { animation: line-shake 0.35s ease-in-out; }
@keyframes line-shake {
  0%, 100% { opacity: 1; }
  25%, 75% { opacity: 0.2; }
}
.rubber {
  stroke: var(--fg);
  stroke-width: 4;
  stroke-dasharray: 10 10;
  stroke-linecap: round;
  opacity: 0.7;
  pointer-events: none;
}

/* ---- dots ---- */
/* Hit testing is geometric (js/render.js), so the drawing itself never takes pointer events. */
#board { cursor: pointer; }
#board.board--erasing { cursor: crosshair; }
.dot { pointer-events: none; }
.dot-circle {
  fill: var(--dot);
  stroke: transparent;
  stroke-width: 8;
  transition: fill 0.25s, stroke 0.15s;
}
.dot-label {
  fill: var(--bg);
  font-size: 36px;
  font-weight: 700;
  text-anchor: middle;
  dominant-baseline: central;
}
.dot--selected .dot-circle { stroke: var(--fg); }
.dot--ok .dot-circle { fill: var(--ok); }
.dot--bad .dot-circle { fill: var(--bad); }

.dot--shake {
  transform-box: fill-box;
  transform-origin: center;
  animation: shake 0.35s ease-in-out;
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-10px); }
  40% { transform: translateX(10px); }
  60% { transform: translateX(-6px); }
  80% { transform: translateX(6px); }
}

/* ---- win: the whole constellation lights up ---- */
.board--solved .line { stroke: var(--ok); }
.board--solved .dot-circle { fill: var(--ok); }
.board--solved .lines,
.board--solved .dots {
  filter: drop-shadow(0 0 8px var(--ok));
  animation: fade-in 0.8s ease-out;
}
#board.board--solved { cursor: default; }

@keyframes fade-in {
  from { opacity: 0.4; }
  to { opacity: 1; }
}

/* ---- reduced motion: no shaking, pulsing or fading ----
   A rejected dot gets a brief red ring instead of the shake (its animationend bubbles up to the
   .dot group, which is what render.js listens on). The win glow stays, just without the fade. */
@media (prefers-reduced-motion: reduce) {
  .dot--shake { animation: none; }
  .dot--shake .dot-circle { animation: dot-flag 0.6s steps(1, end); }
  .line--flash { animation: none; } /* .line--shake is an opacity blink, not motion: kept */
  .reveal,
  .board--solved .lines,
  .board--solved .dots { animation: none; }
}
@keyframes dot-flag {
  0% { stroke: var(--bad); }
  100% { stroke: transparent; }
}