/* =========================================================
   Chalk Hop — portrait canvas shell
   Palette: deep midnight board (60%), soft chalk (30%),
   warm chalk accents used sparingly (10%).
   ========================================================= */

:root {
  /* base — midnight board */
  --ink: #0d1226;
  --ink-deep: #070a18;
  --ink-soft: #141c38;

  /* chalk */
  --chalk: #e9edf9;
  --chalk-dim: #93a0c4;

  /* accents (rare) */
  --chalk-yellow: #f6d97b;
  --chalk-coral: #ff9081;

  /* hairlines & depth */
  --edge: rgba(233, 237, 249, 0.14);
  --edge-soft: rgba(233, 237, 249, 0.07);
  --shadow-deep: 0 28px 64px -24px rgba(0, 0, 0, 0.9);

  /* 8px spacing scale */
  --s-1: 8px;
  --s-2: 16px;
  --s-3: 24px;
  --s-4: 32px;
  --s-6: 48px;

  --radius-frame: 20px;

  --font-hand: 'Patrick Hand', 'Segoe Print', 'Segoe UI', system-ui, -apple-system, sans-serif;

  --frame-inset: 12px;
}

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

html {
  height: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100%;
  min-height: 100dvh;
  overflow: hidden;
  background-color: var(--ink);
  color: var(--chalk);
  font-family: var(--font-hand);
  font-size: 18px;
  line-height: 1.7;
  letter-spacing: 0.2px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
}

/* Ambient chalk dust glow behind the board */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(120% 70% at 50% -12%, rgba(246, 217, 123, 0.10), transparent 62%),
    radial-gradient(110% 65% at 50% 112%, rgba(255, 144, 129, 0.09), transparent 66%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-deep) 100%);
}

/* Faint chalk-dot texture */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.32;
  background-image: radial-gradient(rgba(233, 237, 249, 0.11) 1px, transparent 1px);
  background-size: 24px 24px;
  background-position: center;
}

/* ---------- Stage ---------- */

.stage {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  height: 100vh;
  height: 100dvh;
  width: 100%;
  margin: 0;
  padding:
    calc(var(--frame-inset) + env(safe-area-inset-top, 0px))
    calc(var(--frame-inset) + env(safe-area-inset-right, 0px))
    calc(var(--frame-inset) + env(safe-area-inset-bottom, 0px))
    calc(var(--frame-inset) + env(safe-area-inset-left, 0px));
}

/* ---------- The board ---------- */

#game {
  display: block;
  flex: 0 0 auto;

  /* Fit the tallest 9:16 portrait board inside the window */
  width: min(
    calc(100vw - (2 * var(--frame-inset))),
    calc((100vh - (2 * var(--frame-inset))) * 9 / 16)
  );
  width: min(
    calc(100vw - (2 * var(--frame-inset))),
    calc((100dvh - (2 * var(--frame-inset))) * 9 / 16)
  );
  height: min(
    calc(100vh - (2 * var(--frame-inset))),
    calc((100vw - (2 * var(--frame-inset))) * 16 / 9)
  );
  height: min(
    calc(100dvh - (2 * var(--frame-inset))),
    calc((100vw - (2 * var(--frame-inset))) * 16 / 9)
  );

  /* Painted while JS core.js boots up */
  background-color: #0b1022;
  background-image:
    radial-gradient(90% 55% at 50% 0%, rgba(233, 237, 249, 0.05), transparent 70%),
    radial-gradient(80% 45% at 50% 100%, rgba(246, 217, 123, 0.05), transparent 72%);

  border: 1px solid var(--edge);
  border-radius: var(--radius-frame);
  box-shadow:
    var(--shadow-deep),
    inset 0 0 0 1px var(--edge-soft);

  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  outline: none;
  animation: board-in 480ms cubic-bezier(0.22, 0.75, 0.3, 1) both;
}

#game:focus-visible {
  border-color: var(--chalk-yellow);
  box-shadow:
    var(--shadow-deep),
    0 0 0 3px rgba(246, 217, 123, 0.28);
}

@keyframes board-in {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.985);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ---------- Fallbacks ---------- */

.notice {
  margin: 0;
  max-width: 34ch;
  padding: var(--s-2) var(--s-3);
  text-align: center;
  font-size: 1.05rem;
  color: var(--chalk);
  background: rgba(20, 28, 56, 0.85);
  border: 1px dashed var(--edge);
  border-radius: 14px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- Landscape hint ---------- */

@media (orientation: landscape) and (max-height: 480px) {
  .stage {
    gap: var(--s-1);
  }

  #game {
    border-radius: 14px;
  }
}

/* ---------- Reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  #game {
    animation: none;
  }
}