:root {
  --bg: #f1f5f9;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --primary: #2563eb;
  --accent: #0f766e;
  --border: #dbe3ee;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Inter, Segoe UI, Arial, sans-serif;
  background: linear-gradient(180deg, #eef2ff, var(--bg));
  color: var(--text);
}

.app {
  max-width: 1050px;
  margin: 0 auto;
  padding: 24px 16px 48px;
  display: grid;
  gap: 16px;
}

header h1 { margin: 0 0 8px; }
header p { margin: 0; color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.06);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 12px;
}

label {
  font-size: 14px;
  color: #1e293b;
  display: grid;
  gap: 6px;
}

input {
  width: 100%;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  padding: 10px;
  font-size: 15px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

button {
  border: none;
  border-radius: 10px;
  background: var(--primary);
  color: white;
  font-weight: 600;
  padding: 12px 18px;
  cursor: pointer;
}

.note { margin: 0; color: var(--muted); font-size: 14px; }

.results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.metric {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
}

.metric.highlight {
  border-color: #8b5cf6;
  box-shadow: 0 8px 20px rgba(139, 92, 246, 0.2);
}

.metric h3 { margin: 0 0 8px; font-size: 16px; }
.value { margin: 0 0 4px; font-size: 26px; font-weight: 700; }
.metric small { color: var(--muted); }

#details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 12px;
}

#details div {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 14px;
}

.tips ul { margin: 0; padding-left: 18px; }
.tips li { margin-bottom: 8px; color: #334155; }

@media (max-width: 700px) {
  #details { grid-template-columns: 1fr; }
}