:root {
  --wood-hue: 28;
  --wood-dark: hsl(var(--wood-hue) 64% 9%);
  --wood: hsl(var(--wood-hue) 60% 13%);
  --wood-light: hsl(var(--wood-hue) 53% 15%);

  --felt-hue: 149;
  --felt: hsl(var(--felt-hue) 40% 15%);
  --felt-dark: hsl(var(--felt-hue) 41% 10%);

  --brass-hue: 40;
  --brass: hsl(var(--brass-hue) 55% 52%);
  --brass-light: hsl(var(--brass-hue) 77% 72%);
  --brass-dark: hsl(var(--brass-hue) 59% 30%);
  --brass-black: hsl(var(--brass-hue) 28% 5%);

  --gold: hsl(var(--brass-hue) 100% 74%);
  --gold-white: hsl(var(--brass-hue) 100% 90%);

  --die-fill-1: hsl(var(--brass-hue) 71% 93%);
  --die-fill-2: hsl(var(--brass-hue) 54% 81%);
  --die-fill-3: hsl(var(--brass-hue) 47% 71%);
  --die-border: hsl(var(--brass-hue) 68% 32%);
  --die-black: hsl(28 47% 12%);

  --roll-red-hue: 354;
  --roll-red: hsl(var(--roll-red-hue) 55% 36%);
  --roll-red-light: hsl(var(--roll-red-hue) 51% 48%);
  --roll-red-dark: hsl(var(--roll-red-hue) 57% 28%);

  --shadow-colour: hsl(0 0 0 / 0.4);
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }

body {
  font-family: 'Noto Serif', serif;
  display: grid;
  grid-template-rows: [top] auto [tray-start] 1fr [bottom] auto;
  height: 100vh;
  height: 100dvh;
}

button {
  color: inherit;
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: 10px;
}
button:focus-visible {
  outline: 2px solid var(--brass-light);
  outline-offset: 2px;
}

/* shared readout styles */
.readout {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.readout label {
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--brass);
}
.readout output {
  background: var(--brass-black);
  border: 2px solid var(--brass-dark);
  border-radius: 6px;
  text-align: center;
  font-size: 20px;
  min-width: 2.5em;
  line-height: 1.8;
  font-family: 'Noto Serif Display', 'Noto Serif', serif;
  font-weight: 700;
  color: var(--gold);
  box-shadow: 0 2px 6px var(--shadow-colour),
    inset 0 0 10px hsl(0 0 0 / 0.85),
    inset 0 0 22px hsl(0 0 0 / 0.6),
    inset 0 0 0 3px var(--brass-dark);
}
.readout output .sign {
  font-family: 'Noto Serif', serif; /* Display font has no bolding on signs */
  margin-left: -0.15em; /* nudge readout value to optically center */
}

/* total-panel, modifier-panel, roll-panel */
.control-panel {
  --border-style: 2px solid var(--brass-dark);
  --panel-padding-side: 16px;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 8px var(--panel-padding-side);
  background: linear-gradient(var(--gradient-angle, 180deg), var(--wood-light), var(--wood-dark));
}
.control-panel button {
  color: var(--brass-light);
}


.control-panel, #dice-tray {
  --gap: 16px;
  gap: var(--gap);
}


/* primary button with 3D press effect */
button.primary {
  --button-edge-colour: var(--brass-dark);
  --button-shadow: 0 4px 8px var(--shadow-colour);
  --button-press-shadow: 0 1px 4px var(--shadow-colour);
  --button-z-length: 3px;
  box-shadow: 0 var(--button-z-length) var(--button-edge-colour), var(--button-shadow);
  transition: transform 0.08s ease, box-shadow 0.08s ease;
}
button.primary:active {
  transform: translateY(var(--button-z-length));
  box-shadow: 0 0 var(--button-edge-colour), var(--button-press-shadow);
}

/* shared styles for die buttons */
.die {
  --die-shadow: 0 4px 6px var(--shadow-colour);
  background: none;
  border: none;
  padding: 0;
  filter: drop-shadow(var(--die-shadow)); /* die-shaped shadow */ 
  transition: transform 120ms ease;
  -webkit-tap-highlight-color: transparent;
}
.die:hover {
  transform: translateY(-2px) scale(1.05);
}
.die:active {
  transform: translateY(1px) scale(0.95);
}
.die svg { width: 100%; height: 100%; display: block; }
.die text {
  fill: var(--die-black);
  dominant-baseline: middle;
  text-anchor: middle;
  font-size: 32px;
  font-weight: 400;
}
.die .die-shape {
  fill: url(#die-fill);
  stroke: var(--die-border);
  stroke-width: 3;
  stroke-linejoin: round;
}

/* ---------- total panel ---------- */
#total-panel {
  padding-top: 4px;
  border-bottom: var(--border-style);
}

#total-panel .readout label {
  font-family: "Noto Serif Display", "Noto Serif", serif;
  font-size: 12px;
  letter-spacing: 4px;
}
#total-panel .readout output {
  --glow-hsl: var(--brass-hue) 100% 70%;
  display: inline-block;
  font-size: 34px;
  line-height: 1.7;
  letter-spacing: 1px;
  text-shadow: 0 0 8px hsl(var(--glow-hsl) / 0.7), 0 0 2px hsl(var(--glow-hsl) / 0.9); /* glow */
  min-width: 3.5em;
  border-radius: 10px;
  border-color: var(--brass);
  transition-property: transform, color;
  transition-timing-function: ease;
  transition-duration: 300ms;
}
#total-panel .readout output.pulse {
  transform: scale(1.2);
  color: var(--gold-white);
  transition-duration: 50ms;
}

#reset-button {
  --button-highlight: var(--wood-light);
  --button-shadow: hsl(var(--wood-hue) 50% 5%);
  position: absolute;
  right: var(--panel-padding-side);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5em;
  background: var(--wood);
  border: 1px solid var(--brass-dark);
  box-shadow: inset 0 0 0 1px var(--button-shadow), inset 0px 1px 0 1px var(--button-highlight);
  padding: 0.6em 1.15em;
  color: var(--brass);
  line-height: 1.7;
  letter-spacing: 1.5px;
  transition-property: background, box-shadow;
  transition-duration: 120ms;
}
#reset-button:hover {
  background: var(--wood-light);
}
#reset-button:active {
  --button-highlight: var(--button-shadow);
  background: var(--wood);
}
#reset-button svg {
  --size: 1.15em;
  width: var(--size);
  height: var(--size);
  fill: none;
  stroke: currentColor;
  stroke-width: 2.4;
}

/* ---------- dice tray ---------- */

#dice-tray {
  margin: 0;
  padding: 16px;
  background: radial-gradient(ellipse at 50% 40%, var(--felt) 0%, var(--felt-dark) 78%);
  box-shadow: inset 0 0 60px hsl(0 0 0 / 0.55), inset 0 0 0 6px hsl(0 0 0 / 0.25);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-content: center;
  overflow: hidden;
  position: relative; /* positioning context for decoration pseudo-element */
}
#dice-tray::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 2px solid var(--brass);
  opacity: 0.35;
  border-radius: 6px;
  pointer-events: none;
}

#dice-tray.vertical {
  flex-direction: column;
}
#dice-tray.vertical .die {
  max-width: var(--max-cross-axis);
  max-height: var(--max-main-axis);
}

#dice-tray .die {
  --max-main-axis: calc(
    ( var(--container-max, 80vmin) - var(--line-width)*var(--gap) )
    / var(--line-width));
  --max-cross-axis: calc(
    ( var(--container-min, 80vmin) - (var(--line-count) - 1)*var(--gap) ) 
    / var(--line-count)
  );
  max-width: var(--max-main-axis);
  max-height: var(--max-cross-axis);
  aspect-ratio: 1;
}
#dice-tray .die .die-shape {
  stroke-width: 2px;
}
#dice-tray .die text {
  font-family: 'Noto Serif Display', serif;
  font-weight: 300;
}
#dice-tray .die.rolled .die-shape {
  --die-rotation: 15deg;
  animation: dieSpin 70ms infinite alternate ease-in-out;
}
@keyframes dieSpin {
  from { transform: rotate(calc(-1 * var(--die-rotation))); }
  to { transform: rotate(var(--die-rotation)) }
}


#modifier-panel, #roll-panel {
  --button-size: 56px;
}

/* ---------- modifier panel ---------- */
#modifier-panel {
  border-top: var(--border-style);
}
#modifier-panel button.primary {
  width: var(--button-size);
  height: var(--button-size);
  font-size: 26px;
  line-height: 1;
  margin: 2px 0;
  background: radial-gradient(ellipse at 35% 30%, hsl(var(--wood-hue) 50% 20%), var(--wood-dark) 75%);
  border: 2px solid var(--brass);
}
#modifier-panel button.primary:hover {
  color: var(--gold-white);
  border-color: var(--brass-light);
}

/* ---------- roll panel ---------- */
#roll-panel {
  --gradient-angle: 0deg;
  row-gap: 10px;
  flex-wrap: wrap;
  min-height: calc(1.5 * var(--button-size)); /* single row height */
  border-top: 1px solid var(--brass-dark);
}

#die-types {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
}
#die-types .die {
  --die-shadow: 0 3px 4px var(--shadow-colour);
  width: var(--button-size);
  height: var(--button-size);
}

#roll-button {
  --button-edge-colour: hsl(var(--roll-red-hue) 40% 35%);
  --button-shadow: 0 5px 10px var(--shadow-colour);
  --button-press-shadow: 0 2px 5px var(--shadow-colour);
  height: var(--button-size);
  max-width: calc(var(--button-size) * 2 * 1.618);
  flex-grow: 1;
  padding: 0 1.6em;
  font-size: 15px;
  letter-spacing: 1.5px;
  background: linear-gradient(180deg, var(--roll-red-light), var(--roll-red) 55%, var(--roll-red-dark));
  color: hsl(var(--brass-hue) 100% 95%);
  border: 2px solid hsl(var(--roll-red-hue) 35% 55%);
}
#roll-button:hover { filter: brightness(1.08); }

@media (max-width: 480px) {
  button { font-size: 10px; }
  #total-panel .readout output { font-size: 26px; }
  #modifier-panel, #roll-panel { --button-size: 44px; }
  #modifier-panel .readout output { font-size: 18px; }
  #roll-button { font-size: 12px; }
}