* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Vazirmatn", Tahoma, sans-serif;
  background: #f6f8fb;
  color: #222;
}
header {
  background: #1f355e;
  color: #fff;
  padding: 1rem;
}
header h1 {
  margin: 0 0 0.75rem;
  font-size: 1.2rem;
}
nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
nav a {
  color: #fff;
  text-decoration: none;
  background: rgba(255,255,255,0.15);
  padding: 0.4rem 0.7rem;
  border-radius: 8px;
}
main {
  max-width: 1200px;
  margin: 1rem auto;
  padding: 0 1rem 2rem;
}
.card {
  background: #fff;
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1rem;
  box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}
.grid-3 {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.chart-wrap {
  position: relative;
  min-height: 360px;
  margin-bottom: 1rem;
}
table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}
th, td {
  border: 1px solid #d8deeb;
  padding: 0.55rem;
  text-align: center;
}
th {
  background: #eef3ff;
}
input[type="number"] {
  width: 100%;
  max-width: 180px;
  padding: 0.4rem;
  font-family: inherit;
}
button, .btn {
  border: none;
  background: #1f77b4;
  color: #fff;
  padding: 0.5rem 0.8rem;
  border-radius: 8px;
  text-decoration: none;
  cursor: pointer;
}
.flash {
  padding: 0.65rem 0.8rem;
  border-radius: 8px;
  margin-bottom: 1rem;
}
.flash.success { background: #d1f5dd; color: #14532d; }
.flash.error { background: #ffe1e1; color: #7f1d1d; }

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}
.card-header h2 {
  margin: 0;
}
.btn-download {
  background: #2c6fad;
  color: #fff;
  border: none;
  padding: 0.4rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.875rem;
  white-space: nowrap;
}
.btn-download:hover {
  background: #1f5a9a;
}