:root {
  --bg: #f3f7ff;
  --panel: rgba(255, 255, 255, 0.76);
  --panel-border: rgba(148, 163, 184, 0.27);
  --primary: #4f46e5;
  --primary-soft: #c7d2fe;
  --secondary: #0f172a;
  --muted: #475569;
  --filled: #4f46e5;
  --empty: #dfe7ff;
  --text: #111827;
  --success: #16a34a;
  --shadow: 0 18px 45px rgba(79, 70, 229, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, #eef4ff, #f8fafc 45%, #eef2ff 100%);
  color: var(--text);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

button,
input {
  font: inherit;
}

.page-shell {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 20px 48px;
}

.topbar {
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  color: var(--primary);
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
}

h2,
h3 {
  margin: 0 0 16px;
}

.layout {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 24px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 22px;
  box-shadow: var(--shadow);
  padding: 24px;
  backdrop-filter: blur(8px);
}

.inputs-panel,
.chart-panel {
  min-height: 100%;
}

.fraction-inputs {
  display: grid;
  grid-template-columns: repeat(2, minmax(120px, 1fr));
  gap: 16px;
  margin-bottom: 18px;
}

.fraction-inputs.compact {
  grid-template-columns: 1fr;
  gap: 12px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--muted);
  font-weight: 600;
}

input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: rgba(255, 255, 255, 0.72);
  color: var(--text);
  font-size: 1rem;
}

input:focus {
  outline: 3px solid rgba(79, 70, 229, 0.16);
  border-color: rgba(79, 70, 229, 0.7);
}

.actions {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

button {
  appearance: none;
  border: none;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), #4338ca);
  color: white;
  padding: 12px 18px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  box-shadow: 0 10px 20px rgba(79, 70, 229, 0.25);
}

button:hover {
  transform: translateY(-1px);
}

button.secondary {
  background: #e2e8f0;
  color: var(--secondary);
  box-shadow: none;
}

.info-box {
  padding: 16px 18px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(99, 102, 241, 0.03));
  border: 1px solid rgba(79, 70, 229, 0.15);
  margin-bottom: 14px;
}

.label {
  margin: 0 0 8px;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.fraction-value {
  font-weight: 800;
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  display: inline-block;
}

.legend {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 0.95rem;
}

.legend-swatch {
  width: 18px;
  height: 18px;
  border-radius: 6px;
  display: inline-block;
}

.legend-swatch.filled {
  background: var(--filled);
}

.legend-swatch.empty {
  background: var(--empty);
}

.visual-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 18px;
}

.chart-wrap {
  position: relative;
  width: min(100%, 300px);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
}

.fraction-chart {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  position: relative;
  overflow: hidden;
  box-shadow: inset 0 0 0 1px rgba(148, 163, 184, 0.3);
  background: #f8fafc;
}


.chart-center {
  position: absolute;
  inset: 50% auto auto 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  font-size: clamp(1.1rem, 2.8vw, 1.6rem);
  font-weight: 800;
  z-index: 1;
}

.whole-charts {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  min-height: 52px;
  max-width: 220px;
}

.mini-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.mini-chart {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: #4f46e5;
  box-shadow: inset 0 0 0 1px rgba(79, 70, 229, 0.12);
  position: relative;
  overflow: hidden;
}

.mini-chart svg {
  display: block;
  width: 100%;
  height: 100%;
}

.mini-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--muted);
}

.chart-description {
  text-align: center;
  color: var(--muted);
  margin: 0;
  font-size: 1rem;
}

.calculator-panel {
  margin-top: 28px;
}

.calculator-header {
  margin-bottom: 18px;
}

.calculator-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(220px, 1fr));
  gap: 18px;
}

.multiply-chart {
  width: 150px;
  height: 150px;
  margin: 16px auto 0;
  border-radius: 50%;
  overflow: hidden;
  box-shadow: inset 0 0 0 1px rgba(148, 163, 184, 0.3);
}

.compare-panel {
  margin-top: 28px;
}

.comparison-grid {
  display: grid;
  grid-template-columns: minmax(200px, 1fr) auto minmax(200px, 1fr);
  gap: 18px;
  align-items: center;
}

.compare-block {
  padding: 18px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(148, 163, 184, 0.2);
}

.compare-chart {
  width: 150px;
  height: 150px;
  margin: 16px auto 0;
  border-radius: 50%;
  overflow: hidden;
  box-shadow: inset 0 0 0 1px rgba(148, 163, 184, 0.3);
}

.compare-result-box {
  display: flex;
  justify-content: center;
  align-items: center;
}

.compare-result {
  font-size: 1.2rem;
  font-weight: 800;
  padding: 12px 18px;
  border-radius: 12px;
  background: rgba(79, 70, 229, 0.08);
  border: 1px solid rgba(79, 70, 229, 0.15);
  text-align: center;
}

.comparison-actions {
  margin-top: 18px;
  display: flex;
  justify-content: center;
}

.calc-card {
  padding: 20px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid rgba(148, 163, 184, 0.2);
}

.result-block {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(22, 163, 74, 0.08);
  border: 1px solid rgba(22, 163, 74, 0.2);
  color: var(--secondary);
  font-weight: 600;
}

.result-block p {
  margin: 0;
  line-height: 1.55;
}

@media (max-width: 840px) {
  .layout,
  .calculator-grid {
    grid-template-columns: 1fr;
  }
}