:root {
  color-scheme: light;
  --color-bg: #f4f5f7;
  --color-panel: #ffffff;
  --color-border: #d7dbe0;
  --color-text: #1c232b;
  --color-muted: #64707c;
  --color-primary: #1f5fbf;
  --color-primary-dark: #164a97;
  --color-danger: #b3261e;
  --color-danger-bg: #fdecea;
  --color-warning: #8a5a00;
  --color-warning-bg: #fff4de;
  --color-success: #146c2e;
  --color-success-bg: #e8f5ea;
  --color-idle-bg: #eef1f5;
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.4;
}

.app-header {
  padding: 1.25rem 1.5rem 0.5rem;
}

.app-header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.5rem;
}

.app-subtitle {
  margin: 0;
  color: var(--color-muted);
}

.app-messages {
  padding: 0 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.app-message {
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background: var(--color-idle-bg);
  font-size: 0.9rem;
}

.app-message--error {
  background: var(--color-danger-bg);
  border-color: var(--color-danger);
  color: var(--color-danger);
}

.app-message--warning {
  background: var(--color-warning-bg);
  border-color: var(--color-warning);
  color: var(--color-warning);
}

.restore-banner {
  margin: 0.75rem 1.5rem 0;
  padding: 0.75rem 1rem;
  background: var(--color-warning-bg);
  border: 1px solid var(--color-warning);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.restore-banner[hidden] {
  display: none;
}

.restore-banner p {
  margin: 0;
}

.restore-banner-actions {
  display: flex;
  gap: 0.5rem;
}

.api-key-warning-banner {
  margin: 0.75rem 1.5rem 0;
  padding: 0.75rem 1rem;
  background: var(--color-warning-bg);
  border: 1px solid var(--color-warning);
  border-radius: var(--radius);
}

.api-key-warning-banner[hidden] {
  display: none;
}

.api-key-warning-banner p {
  margin: 0;
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  padding: 1rem 1.5rem 2rem;
  align-items: start;
}

.panel {
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
}

.panel--wide {
  grid-column: 1 / -1;
}

.panel h2 {
  margin: 0 0 0.75rem;
  font-size: 1.05rem;
}

.panel h3 {
  margin: 1rem 0 0.5rem;
  font-size: 0.95rem;
}

.panel-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.muted {
  color: var(--color-muted);
  font-size: 0.88rem;
}

.button-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin: 0.5rem 0;
}

button {
  font: inherit;
  padding: 0.5rem 0.9rem;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  background: #fff;
  cursor: pointer;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

button.primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

button.primary:hover:not(:disabled) {
  background: var(--color-primary-dark);
}

button.secondary {
  background: #fff;
  color: var(--color-text);
}

button.danger {
  background: #fff;
  color: var(--color-danger);
  border-color: var(--color-danger);
}

button.danger:hover:not(:disabled) {
  background: var(--color-danger-bg);
}

.link-button {
  background: none;
  border: none;
  padding: 0;
  color: var(--color-primary);
  text-decoration: underline;
  font-size: 0.85rem;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0.4rem 0;
}

.field-row {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin: 0.5rem 0;
}

.field-row label {
  font-size: 0.85rem;
  color: var(--color-muted);
}

.field-row input[type='text'],
.field-row input[type='password'] {
  font: inherit;
  padding: 0.45rem 0.6rem;
  border-radius: 6px;
  border: 1px solid var(--color-border);
}

.fact-list {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.15rem 0.75rem;
  margin: 0.5rem 0;
}

.fact-list dt {
  color: var(--color-muted);
  font-size: 0.85rem;
}

.fact-list dd {
  margin: 0;
  font-weight: 600;
}

.status-dot {
  display: inline-block;
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  margin-right: 0.35rem;
}

.status-dot--connected {
  background: var(--color-success);
}

.status-dot--disconnected {
  background: var(--color-muted);
}

/* Latest scan panel: the most visually prominent element on the page. */
.latest-scan {
  border-width: 2px;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.latest-scan-status-text {
  font-weight: 700;
  font-size: 1.05rem;
  margin: 0 0 0.5rem;
}

.latest-scan--idle {
  background: var(--color-idle-bg);
  border-color: var(--color-border);
}

.latest-scan--pending {
  background: #eef4ff;
  border-color: var(--color-primary);
}

.latest-scan--present {
  background: var(--color-success-bg);
  border-color: var(--color-success);
}

.latest-scan--lookup_error {
  background: var(--color-warning-bg);
  border-color: var(--color-warning);
}

/* Unexpected students get the strongest visual treatment: not just red
   background/border, but bold status text with an explicit icon+label so
   the warning does not rely on color alone. */
.latest-scan--unexpected {
  background: var(--color-danger-bg);
  border-color: var(--color-danger);
  border-width: 3px;
  box-shadow: 0 0 0 3px rgba(179, 38, 30, 0.15);
}

.latest-scan--unexpected .latest-scan-status-text {
  color: var(--color-danger);
  font-size: 1.3rem;
}

.table-scroll {
  overflow-x: auto;
}

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

th,
td {
  text-align: left;
  padding: 0.45rem 0.6rem;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.status-badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--color-idle-bg);
}

.status-badge--present {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.status-badge--unexpected {
  background: var(--color-danger-bg);
  color: var(--color-danger);
}

.status-badge--lookup_error {
  background: var(--color-warning-bg);
  color: var(--color-warning);
}

.status-badge--pending {
  background: var(--color-idle-bg);
  color: var(--color-muted);
}

details.panel > summary {
  cursor: pointer;
  font-size: 1.05rem;
  font-weight: 600;
  padding: 0.1rem 0;
}

.diagnostics-body,
.settings-body {
  margin-top: 0.75rem;
}

.settings-body {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  align-items: start;
}

.diag-pre {
  background: #0b1220;
  color: #d7e2f2;
  padding: 0.75rem;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.8rem;
  max-height: 220px;
  overflow-y: auto;
}

.diag-report-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  max-height: 260px;
  overflow-y: auto;
}

.diag-report-entry {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 0.4rem 0.6rem;
  font-size: 0.8rem;
}

.diag-report-entry-header {
  display: flex;
  justify-content: space-between;
  color: var(--color-muted);
  margin-bottom: 0.2rem;
}

.diag-report-hex,
.diag-report-parsed {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  overflow-wrap: anywhere;
}

@media (max-width: 640px) {
  .app-grid {
    grid-template-columns: 1fr;
  }
  th,
  td {
    white-space: normal;
  }
}