:root {
  --bg-color: #F5F5F7;
  --card-bg: #FFFFFF;
  --primary-blue: #0071E3;
  --primary-hover: #0077ED;
  --text-main: #1D1D1F;
  --text-secondary: #86868B;
  --danger: #FF3B30;
  --success: #34C759;
  --warning: #FF9500;
  --radius-l: 24px;
  --radius-m: 18px;
  --radius-s: 12px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
  --font-stack: 'Prompt', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  font-family: var(--font-stack);
  background-color: var(--bg-color);
  color: var(--text-main);
  margin: 0;
  padding: 40px 20px;
  -webkit-font-smoothing: antialiased;
}

/* Layout */
.container {
  max-width: 800px;
  margin: 0 auto;
}

header {
  text-align: center;
  margin-bottom: 40px;
}

header h1 {
  font-size: 48px;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.5px;
}

header p {
  font-size: 18px;
  color: var(--text-secondary);
  margin-top: 8px;
  font-weight: 300;
}

main {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

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

@media (max-width: 600px) {
  .grid-layout {
    grid-template-columns: 1fr;
  }
}

/* Cards */
.card {
  background: var(--card-bg);
  border-radius: var(--radius-l);
  padding: 30px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.5);
  transition: transform 0.3s ease;
}

h2 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 20px;
  margin-top: 0;
}

/* Inputs */
.input-group {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
}

.input-wrapper {
  flex: 1;
}

label {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  font-weight: 500;
}

input {
  width: 100%;
  background: #F5F5F7;
  border: none;
  border-radius: var(--radius-s);
  padding: 16px;
  font-size: 18px;
  color: var(--text-main);
  font-family: var(--font-stack);
  box-sizing: border-box;
  transition: all 0.2s;
}

input:focus {
  outline: none;
  background: #FFFFFF;
  box-shadow: 0 0 0 2px var(--primary-blue);
}

/* Buttons */
button {
  width: 100%;
  padding: 16px;
  background: var(--primary-blue);
  color: white;
  border: none;
  border-radius: 99px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

button:hover {
  background: var(--primary-hover);
  transform: scale(1.01);
}

button:active {
  transform: scale(0.98);
}

.text-btn {
  width: auto;
  background: transparent;
  color: var(--danger);
  padding: 8px 12px;
  font-size: 14px;
}

.text-btn:hover {
  background: rgba(255, 59, 48, 0.1);
}

.error {
  color: var(--danger);
  font-size: 14px;
  margin-top: 10px;
  text-align: center;
  min-height: 20px;
}

/* Result Circle */
.result-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.result-circle {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: conic-gradient(from 0deg, #F5F5F7 0%, #FFFFFF 100%);
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  margin-bottom: 15px;
}

#bmi-value {
  font-size: 36px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1;
}

.result-circle small {
  color: var(--text-secondary);
  font-size: 14px;
  margin-top: 5px;
}

.status-badge span {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
}

/* Advice */
.advice-item {
  display: flex;
  gap: 15px;
  padding: 15px 0;
  border-bottom: 1px solid #E5E5EA;
}

.advice-item:last-child {
  border-bottom: none;
}

.advice-item .icon {
  font-size: 24px;
  background: #F2F2F7;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
}

.advice-item h3 {
  margin: 0 0 4px 0;
  font-size: 16px;
}

.advice-item p {
  margin: 0;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* Chart */
.chart-container {
  position: relative;
  height: 250px;
  width: 100%;
}

/* Table */
.card-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.table-wrapper {
  overflow-x: auto;
}

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

th {
  text-align: left;
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 12px;
  border-bottom: 1px solid #E5E5EA;
}

td {
  padding: 16px 12px;
  border-bottom: 1px solid #F2F2F7;
  font-size: 15px;
}

td button {
  background: #F2F2F7;
  color: var(--text-secondary);
  width: 30px;
  height: 30px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
}

td button:hover {
  background: #E5E5EA;
  color: var(--danger);
}

/* Status Colors */
.status-normal { color: var(--success); background: rgba(52, 199, 89, 0.1); }
.status-underweight { color: var(--primary-blue); background: rgba(0, 113, 227, 0.1); }
.status-overweight { color: var(--warning); background: rgba(255, 149, 0, 0.1); }
.status-obese { color: var(--danger); background: rgba(255, 59, 48, 0.1); }