* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  margin: 0;
  color: #1f2937;
  background: #f8fafc;
}
.container { max-width: 1100px; margin: 0 auto; padding: 20px; }
header h1 { margin: 0 0 8px; font-size: 1.6rem; }
/* identity inputs removed */

.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.card { background: white; border: 1px solid #e2e8f0; border-radius: 12px; padding: 14px; box-shadow: 0 1px 2px rgba(0,0,0,0.03); }
.card h2 { margin: 0 0 10px; font-size: 1.1rem; }

.right { text-align: right; }

/* table */
table { width: 100%; border-collapse: collapse; }
th, td { border-bottom: 1px solid #e2e8f0; padding: 8px 10px; text-align: left; }
thead th { background: #f1f5f9; font-size: 0.9rem; }
tfoot td { background: #f8fafc; }

/* inputs */
input[type="number"], input[type="text"] { width: 100%; padding: 8px 10px; border: 1px solid #cbd5e1; border-radius: 8px; }
input[type="number"]:focus, input[type="text"]:focus { outline: none; border-color: #60a5fa; box-shadow: 0 0 0 3px rgba(96,165,250,0.25); }

/* summary */
.summary-grid { display: grid; grid-template-columns: 280px 1fr; gap: 16px; align-items: start; }
.summary-box { display: grid; gap: 10px; padding: 12px; border: 1px dashed #cbd5e1; border-radius: 10px; background: #f8fafc; }
.summary-box > div { display: flex; justify-content: space-between; align-items: center; }
.summary-box strong { font-size: 1.15rem; color: #0f172a; }

.note { margin-top: 10px; color: #475569; font-size: 0.9rem; }

.summary-actions {
  display: flex;
  gap: 10px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.preview-trigger,
.simulate-trigger {
  align-self: flex-start;
}

.simulate-trigger {
  background: #dcfce7;
  border-color: #86efac;
}

.simulate-trigger:hover {
  background: #bbf7d0;
}

footer { margin-top: 18px; color: #64748b; }
.footer-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 10px;
  border-top: 1px dashed #cbd5e1;
  flex-wrap: wrap;
}
.footer-left, .footer-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.footer-left .dev-name { font-weight: 600; color: #0f172a; }
.footer-left a, .footer-right a { color: #2563eb; text-decoration: none; }
.footer-left a:hover, .footer-right a:hover { text-decoration: underline; }
.sep { opacity: 0.6; }
@media (max-width: 640px) {
  .footer-bar { flex-direction: column; align-items: flex-start; gap: 6px; }
}

@media (max-width: 900px) {
  .grid { grid-template-columns: 1fr; }
  .summary-grid { grid-template-columns: 1fr; }
}

/* buttons */
button { padding: 8px 12px; border-radius: 8px; border: 1px solid #cbd5e1; background:#fff; cursor:pointer; }
button:hover { background: #f1f5f9; }
/* save actions removed */

.preview-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.35);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 1000;
}

.preview-overlay.show { display: flex; }

.preview-dialog {
  background: #ffffff;
  border-radius: 14px;
  box-shadow: 0 25px 50px -12px rgba(30, 41, 59, 0.35);
  width: min(640px, 100%);
  max-height: 90vh;
  overflow-y: auto;
  border: 1px solid #e2e8f0;
}

.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 18px;
  border-bottom: 1px solid #e2e8f0;
}

.preview-header h2 {
  margin: 0;
  font-size: 1.1rem;
  color: #0f172a;
}

.preview-close {
  border: none;
  background: transparent;
  font-size: 1.5rem;
  line-height: 1;
  padding: 4px 8px;
  cursor: pointer;
  color: #0f172a;
}

.preview-close:hover { background: rgba(148, 163, 184, 0.2); border-radius: 6px; }

.preview-content { padding: 18px; display: grid; gap: 18px; }

.preview-section h3 {
  margin: 0 0 10px;
  font-size: 1rem;
  color: #0f172a;
}

.preview-table {
  width: 100%;
  border-collapse: collapse;
  text-align: center;
  font-family: "Segoe UI", Arial, sans-serif;
}

.preview-table th,
.preview-table td {
  border: 1px solid #cbd5e1;
  padding: 10px 12px;
  font-size: 0.95rem;
}

.preview-table thead th {
  background: #0ea5e9;
  color: #ffffff;
  font-weight: 600;
}

.preview-table tbody tr:nth-child(2) td {
  background: #f1f5f9;
  font-weight: 600;
}

.preview-table tbody tr:nth-child(3) td {
  color: #dc2626;
  font-weight: 600;
}

.preview-grade {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  font-size: 1rem;
  font-weight: 600;
}

.preview-grade strong {
  font-size: 2rem;
  color: #dc2626;
}