:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --card: #ffffff;
  --muted: #6b7280;
  --text: #111827; 
  --primary: #2563eb; 
  --primary-600: #1e40af;
  --ring: rgba(37, 99, 235, 0.15);
  --border: #e5e7eb; 
  --success: #16a34a;
  --danger: #dc2626;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.page { min-height: 100%; display: flex; flex-direction: column; }

.header { text-align: center; padding: 32px 16px 8px; }
.header h1 { margin: 0; font-size: 28px; letter-spacing: 0.2px; font-weight: 700; }
.subtitle { margin-top: 6px; color: var(--muted); font-size: 14px; }

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 16px 40px;
  display: grid;
  gap: 24px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 6px 16px rgba(0,0,0,0.06);
  padding: 20px;
}

form { display: flex; flex-direction: column; gap: 16px; }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
@media (max-width: 720px) { .grid { grid-template-columns: 1fr; } }

.field { display: flex; flex-direction: column; gap: 8px; }
label { font-size: 13px; color: var(--muted); }
input, select {
  color: var(--text);
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  outline: none;
  transition: box-shadow .2s, border-color .2s;
}
input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--ring);
}
select:focus { border-color: var(--primary); box-shadow: 0 0 0 4px var(--ring); }
.input-with-prefix { display: flex; align-items: stretch; }
.input-with-prefix select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  color: var(--text);
  background: #ffffff;
  border: 1px solid var(--border);
  border-right: none;
  border-top-left-radius: 10px;
  border-bottom-left-radius: 10px;
  padding: 0 12px;
  min-width: 84px;
}
.input-with-prefix input {
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
  border-left: none;
  flex: 1;
}

.actions { display: flex; gap: 12px; }
.btn {
  appearance: none;
  border: 1px solid var(--primary);
  background: #ffffff;
  color: var(--primary);
  border-radius: 10px;
  padding: 12px 16px;
  font-weight: 600;
  cursor: pointer;
  transition: transform .12s ease, box-shadow .2s, border-color .2s, background .2s, color .2s;
}
.btn:hover { transform: translateY(-1px); background: #f8fafc; }
.btn:active { transform: translateY(0); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #ffffff; }
.btn.primary:hover { background: var(--primary-600); border-color: var(--primary-600); }

.form-error { color: var(--danger); font-size: 14px; }

.results h2 { margin: 6px 0 10px; font-size: 18px; font-weight: 600; }
.summary { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 10px; margin-bottom: 12px; }
.stat { background: #ffffff; border: 1px solid var(--border); border-radius: 10px; padding: 12px; display: flex; flex-direction: column; gap: 6px; }
.stat .label { color: var(--muted); font-size: 12px; }
.stat .value { font-weight: 700; font-size: 16px; }

.table-wrap { overflow: auto; border-radius: 10px; border: 1px solid var(--border); background: #ffffff; }
table { width: 100%; border-collapse: collapse; }
thead { background: #f3f4f6; }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); }
tbody tr:hover { background: #f9fafb; }

.footer { text-align: center; padding: 16px; color: var(--muted); }