:root {
  --bg: #f8f9fa;
  --card: #ffffff;
  --text: #222;
  --muted: #666;
  --primary: #0d6efd;
  --success: #198754;
  --danger: #dc3545;
  --border: #dee2e6;
}

* { box-sizing: border-box; }

body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 0;
  line-height: 1.5;
}

.container { max-width: 1100px; margin: 0 auto; padding: 24px; }

nav {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
nav .nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  justify-content: space-between;
}
nav a { text-decoration: none; color: #333; }
nav a:hover { color: var(--primary); }

h1, h2, h3 { margin: 0 0 12px; }
h1 { font-size: 1.6rem; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
}
th, td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
th { background: #f1f3f5; font-weight: 600; }
tr:hover { background: #f8f9fa; }

input, select, textarea, button {
  font-size: 1rem;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
}
button {
  cursor: pointer;
  background: #fff;
}
button.primary {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}
button.danger { background: var(--danger); color: white; border-color: var(--danger); }

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.flash {
  padding: 12px 16px;
  border-radius: 6px;
  margin-bottom: 16px;
}
.flash.success { background: #d1e7dd; color: #0f5132; }
.flash.error { background: #f8d7da; color: #842029; }

.muted { color: var(--muted); font-size: 0.9rem; }

.total-row {
  font-weight: 700;
  background: #f1f3f5;
}

.right { text-align: right; }

.locked { color: #dc3545; font-weight: 600; }

.spec-header {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
}

@media (max-width: 700px) {
  .spec-header { grid-template-columns: 1fr; }
}

.login-card {
  max-width: 380px;
  margin: 80px auto;
  padding: 32px;
}

label { display: block; margin-bottom: 4px; font-size: 0.9rem; color: #444; }

.row-input { width: 90px; }
.amount-input { width: 110px; text-align: right; }