:root {
  --bg: radial-gradient(1200px 600px at 10% 10%, #f0f4ff 0%, #ffffff 40%, #fefefe 100%);
  --bmi-ar: 4 / 5;
  --underweight-color: #4dabf7;
  --normal-color: #51cf66;
  --overweight-color: #fcc419;
  --obese-color: #ff6b6b;
  --highlight-color: #ff922b;
}

html, body {
  height: 100%;
}

body {
  background: var(--bg);
}

html body {
  padding-top: 0;
}

.bmi-wrap {
  width: min(95vw, 700px);
  margin: 0 auto;
}

.card, .card-body {
  height: 100%;
}

.card-body {
  display: flex;
  flex-direction: column;
}

.form-container {
  max-width: 500px;
  margin: 0 auto;
}

.result-panel {
  background: linear-gradient(135deg, #f5f7fa 0%, #e4e9f2 100%);
  border-radius: 0.5rem;
  padding: 1.5rem;
}

.gauge-wrapper {
  height: 120px;
  position: relative;
}

.bmi-chart-container {
  margin-bottom: 1.5rem;
}

.bmi-chart {
  height: 40px;
  border-radius: 20px;
  margin: 1rem 0;
  position: relative;
  display: flex;
  overflow: hidden;
}

.bmi-chart::after {
  content: "";
  position: absolute;
  height: 100%;
  width: 3px;
  background-color: var(--highlight-color);
  top: 0;
  display: none;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
  z-index: 10;
}

.bmi-chart.has-marker::after {
  display: block;
}

.chart-section {
  height: 100%;
}

.section-underweight {
  background-color: var(--underweight-color);
  width: 15%;
}

.section-normal {
  background-color: var(--normal-color);
  width: 25%;
}

.section-overweight {
  background-color: var(--overweight-color);
  width: 25%;
}

.section-obese {
  background-color: var(--obese-color);
  width: 35%;
}

.bmi-categories {
  display: flex;
  justify-content: space-between;
  text-align: center;
}

.category {
  flex: 1;
  padding: 0 5px;
  font-size: 0.85rem;
}

.category-underweight {
  color: var(--underweight-color);
}

.category-normal {
  color: var(--normal-color);
}

.category-overweight {
  color: var(--overweight-color);
}

.category-obese {
  color: var(--obese-color);
}

.category-label {
  font-weight: 600;
}

.category-range {
  font-size: 0.75rem;
  opacity: 0.8;
}

#gauge-container {
  position: relative;
  width: 100%;
  height: 120px;
}

#gauge-container canvas {
  width: 100% !important;
  height: 100% !important;
}

@media (max-width: 575.98px) {
  .bmi-wrap {
    width: 95vw;
  }
  
  .result-panel {
    padding: 1rem;
  }
  
  #bmi-value {
    font-size: 1.8rem;
  }
  
  .bmi-categories {
    font-size: 0.75rem;
  }
  
  .category-range {
    font-size: 0.65rem;
  }
}