:root {
  --bg: #fafafa;
  --panel: #ffffff;
  --border: #1b1b1b;
  --soft-border: #cfcfcf;
  --muted: #666666;
  --text: #111111;
  --bar: #b8b8b8;
  --bar-bg: #f7f7f7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

button,
input {
  font: inherit;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input[type="number"] {
  appearance: textfield;
  -moz-appearance: textfield;
}

.app {
  display: grid;
  grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
  gap: 16px;
  min-height: 100vh;
  padding: 16px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 16px;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1,
h2 {
  font-size: 18px;
  margin-bottom: 8px;
}

.subtitle,
.status,
.placeholder {
  color: var(--muted);
  font-size: 13px;
}

.controls {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 12px 0 16px;
}

button {
  border: 1px solid var(--border);
  background: #f0f0f0;
  color: var(--text);
  cursor: pointer;
  padding: 6px 10px;
}

button:hover {
  background: #e7e7e7;
}

.roll-table {
  width: 100%;
  border-collapse: collapse;
}

.roll-table th,
.roll-table td {
  border: 1px solid var(--border);
  padding: 6px;
  text-align: left;
}

.roll-table th {
  background: #f2f2f2;
}

.roll-table td:first-child {
  width: 40px;
}

.roll-input {
  width: 100%;
  border: 1px solid var(--border);
  background: #ffffff;
  padding: 6px;
}

.roll-input.is-invalid {
  background: #f3f3f3;
  border-style: dashed;
}

.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.card {
  border: 1px solid var(--border);
  padding: 12px;
  display: grid;
  gap: 10px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
}

.card-title {
  font-size: 15px;
}

.card-ev {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
  white-space: nowrap;
}

.card-description {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
}

.histogram {
  display: grid;
  gap: 8px;
  align-items: end;
}

.histogram-bin {
  display: grid;
  gap: 4px;
}

.bin-probability,
.bin-label {
  font-size: 12px;
}

.bin-shell {
  height: 64px;
  border: 1px solid var(--soft-border);
  background: var(--bar-bg);
  display: flex;
  align-items: end;
}

.bin-bar {
  width: 100%;
  background: var(--bar);
  min-height: 0;
}

@media (max-width: 760px) {
  .app {
    grid-template-columns: 1fr;
  }

  .cards {
    grid-template-columns: 1fr;
  }

  .panel {
    padding: 12px;
  }
}