:root {
  --bg: #f4f3fb;
  --card-bg: #ffffff;
  --primary: #7c3aed;
  --primary-dark: #5b21b6;
  --text: #1f1b2e;
  --muted: #6b6680;
  --border: #e7e3f3;
  --highlight-bg: #efe8fc;
  --warn-bg: #fff4e5;
  --warn-text: #92400e;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  padding: calc(env(safe-area-inset-top, 0px) + 8px) 12px 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.topbar-header {
  display: flex;
  align-items: center;
  gap: 10px;
}

.topbar-logo {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: rgba(255,255,255,0.15);
  padding: 2px;
  flex-shrink: 0;
}

.topbar-org {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  opacity: 0.9;
  line-height: 1.2;
}

.topbar-title {
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.3;
}

main#app {
  padding: 14px 14px 140px;
  max-width: 640px;
  margin: 0 auto;
}

.app-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 8px 14px calc(env(safe-area-inset-bottom, 0px) + 8px);
  background: white;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.75rem;
  color: var(--muted);
  z-index: 5;
  pointer-events: none;
}

.app-footer p {
  margin: 0;
}

.bottomnav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  background: white;
  border-top: 1px solid var(--border);
  padding-bottom: env(safe-area-inset-bottom, 0px);
  overflow-x: auto;
  z-index: 10;
}

.nav-btn {
  flex: 1 0 auto;
  min-width: 64px;
  background: none;
  border: none;
  padding: 8px 4px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  font-size: 0.65rem;
  color: var(--muted);
  cursor: pointer;
}

.nav-btn .ic {
  font-size: 1rem;
  font-weight: 700;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
}

.nav-btn.active {
  color: var(--primary-dark);
  font-weight: 600;
}

.nav-btn.active .ic {
  background: var(--highlight-bg);
  color: var(--primary);
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 16px;
  margin-bottom: 14px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.card h3 {
  margin: 0 0 10px;
  font-size: 1rem;
  color: var(--primary-dark);
}

.lead {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.92rem;
}

.hint {
  font-size: 0.85rem;
  color: var(--muted);
  background: var(--bg);
  border-radius: 10px;
  padding: 10px 12px;
  margin: 8px 0;
}

.warn {
  font-size: 0.85rem;
  color: var(--warn-text);
  background: var(--warn-bg);
  border-radius: 10px;
  padding: 10px 12px;
  margin: 8px 0;
}

.field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.field {
  display: flex;
  flex-direction: column;
  font-size: 0.78rem;
  color: var(--muted);
  gap: 4px;
}

.field em {
  font-style: normal;
  color: #a99fd1;
}

.field input, .field select {
  font-size: 1rem;
  padding: 9px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

.field input:focus, .field select:focus {
  outline: 2px solid var(--primary);
  outline-offset: -1px;
}

.row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 8px 2px;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
  gap: 12px;
}

.row:last-child { border-bottom: none; }

.row-label { color: var(--text); }
.row-value { font-weight: 600; white-space: nowrap; }
.row-value em { font-weight: 400; color: var(--muted); font-style: normal; }

.row.highlight {
  background: var(--highlight-bg);
  border-radius: 10px;
  padding: 10px 10px;
  margin: 4px 0;
  border-bottom: none;
}

.row.highlight .row-value { color: var(--primary-dark); }

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 12px 0;
}

table.dens-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

table.dens-table th, table.dens-table td {
  text-align: left;
  padding: 7px 6px;
  border-bottom: 1px solid var(--border);
}

table.dens-table th { color: var(--muted); font-weight: 600; }

@media (max-width: 380px) {
  .field-grid { grid-template-columns: 1fr; }
}

.bandgap-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin: 12px 0;
}

.bandgap-table th, .bandgap-table td {
  padding: 10px 8px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.bandgap-table th {
  background: var(--highlight-bg);
  color: var(--primary-dark);
  font-weight: 600;
}

.bandgap-table td:last-child {
  text-align: right;
  font-weight: 600;
  color: var(--primary);
}