:root {
  --bg: #0c0f14;
  --bg-elevated: #141a24;
  --bg-input: #0e131c;
  --border: rgba(94, 234, 212, 0.12);
  --accent: #5eead4;
  --accent-dim: rgba(94, 234, 212, 0.55);
  --text: #e8edf5;
  --text-muted: #8b98ab;
  --danger: #f87171;
  --venn-a: rgba(94, 234, 212, 0.38);
  --venn-b: rgba(56, 189, 248, 0.38);
  --venn-c: rgba(251, 191, 36, 0.38);
  --font-sans: "DM Sans", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", ui-monospace, monospace;
  --radius: 12px;
  --shadow: 0 24px 48px rgba(0, 0, 0, 0.45);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--text);
  background:
    radial-gradient(ellipse 120% 80% at 50% -20%, rgba(94, 234, 212, 0.08), transparent),
    radial-gradient(ellipse 80% 50% at 100% 50%, rgba(56, 189, 248, 0.06), transparent),
    var(--bg);
}

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

header.hero {
  text-align: center;
  margin-bottom: 2.25rem;
}

header.hero h1 {
  margin: 0 0 0.35rem;
  font-weight: 700;
  font-size: clamp(1.65rem, 4vw, 2.1rem);
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #f0fdfa 0%, var(--accent) 55%, #38bdf8 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

header.hero p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem 1.35rem 1.15rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.25rem;
}

.field-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-dim);
  margin-bottom: 0.45rem;
}

.list-count-row {
  margin-bottom: 1rem;
}

.list-count-row .narrow-select {
  display: block;
  width: 100%;
  max-width: 22rem;
  margin-top: 0.35rem;
  padding: 0.55rem 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--text);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
}

.list-count-row .narrow-select:focus {
  outline: none;
  border-color: rgba(94, 234, 212, 0.45);
}

.list-count-hint {
  margin: 0.5rem 0 0;
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.4;
  max-width: 36rem;
}

.list-rows {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.list-row {
  display: grid;
  grid-template-columns: minmax(100px, 140px) 1fr;
  gap: 0.65rem 1rem;
  align-items: start;
}

@media (max-width: 640px) {
  .list-row {
    grid-template-columns: 1fr;
  }
}

.list-row .name-input {
  width: 100%;
  padding: 0.55rem 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--text);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.list-row .name-input:focus {
  outline: none;
  border-color: rgba(94, 234, 212, 0.45);
}

.list-row textarea {
  width: 100%;
  min-height: 100px;
  padding: 0.75rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.45;
  color: var(--text);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 10px;
  resize: vertical;
}

.list-row textarea:focus {
  outline: none;
  border-color: rgba(94, 234, 212, 0.45);
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1rem;
  align-items: center;
  margin-top: 1.1rem;
}

.btn-primary {
  padding: 0.6rem 1.2rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.88rem;
  color: #0c0f14;
  background: linear-gradient(135deg, #5eead4, #38bdf8);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: filter 0.15s ease, transform 0.1s ease;
}

.btn-primary:hover {
  filter: brightness(1.08);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-secondary {
  padding: 0.55rem 0.95rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.82rem;
  color: var(--text);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.btn-secondary:hover {
  border-color: rgba(94, 234, 212, 0.45);
  background: rgba(94, 234, 212, 0.06);
}

.btn-secondary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.stats-row {
  margin-top: 0.85rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.stats-row.error {
  color: var(--danger);
}

.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  margin: 0 0 0.85rem;
  cursor: pointer;
  font-size: 0.82rem;
  line-height: 1.35;
  color: var(--text-muted);
}

.checkbox-row input {
  flex-shrink: 0;
  margin-top: 0.2rem;
  width: 1rem;
  height: 1rem;
  accent-color: var(--accent);
}

.breakdown-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  margin-bottom: 0.5rem;
}

.breakdown-header .breakdown-label {
  margin-bottom: 0;
}

.venn-wrap {
  margin-top: 0.35rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(14, 19, 28, 0.65);
  padding: 1rem;
  overflow: auto;
}

.venn-wrap svg {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
}

.legend-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  justify-content: center;
  margin-top: 1rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.legend-bar span {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.legend-bar i {
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 50%;
  display: inline-block;
}

.legend-bar .lg-a i {
  background: var(--venn-a);
  border: 1px solid rgba(94, 234, 212, 0.65);
}
.legend-bar .lg-b i {
  background: var(--venn-b);
  border: 1px solid rgba(56, 189, 248, 0.65);
}
.legend-bar .lg-c i {
  background: var(--venn-c);
  border: 1px solid rgba(251, 191, 36, 0.65);
}

.legend-bar.legend-many .lg-a,
.legend-bar.legend-many .lg-b,
.legend-bar.legend-many .lg-c {
  display: none;
}

.legend-bar .lg-many {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.35;
}

.legend-bar.legend-many .lg-many {
  display: block;
  width: 100%;
  text-align: center;
}


.table-wrap {
  overflow-x: auto;
  margin-top: 0.75rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  max-height: min(55vh, 420px);
  overflow-y: auto;
}

table.breakdown {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

table.breakdown th {
  text-align: left;
  padding: 0.55rem 0.75rem;
  font-weight: 600;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-dim);
  background: rgba(20, 26, 36, 0.97);
  position: sticky;
  top: 0;
  z-index: 1;
  border-bottom: 1px solid var(--border);
}

table.breakdown td {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid rgba(94, 234, 212, 0.06);
  vertical-align: top;
}

table.breakdown td.mono {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  white-space: pre-wrap;
  word-break: break-word;
  max-width: 520px;
}

table.breakdown .num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

footer.note {
  margin-top: 1.5rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.45;
}

footer.note code {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--accent);
}