:root {
  color-scheme: light;
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #17202a;
  --muted: #607080;
  --border: #d8dee6;
  --accent: #166f7a;
  --accent-strong: #0f5962;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.app-shell {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0;
}

.hero {
  padding: 32px 0;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 700;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 12px;
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.05;
}

.lead {
  max-width: 620px;
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1.55;
}

.panel {
  margin-top: 18px;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.hidden {
  display: none;
}

.status-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 0 0 24px;
}

dt {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

dd {
  margin: 4px 0 0;
  overflow-wrap: anywhere;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

button {
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: var(--accent);
  color: #ffffff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

button:disabled {
  border-color: var(--border);
  background: #edf1f4;
  color: var(--muted);
  cursor: not-allowed;
}

.secondary {
  border-color: var(--border);
  background: #ffffff;
  color: var(--text);
}

.message {
  min-height: 1.4em;
  margin: 18px 0 0;
  color: var(--muted);
}

.message.compact {
  margin-top: 6px;
}

.field,
.check-field {
  display: grid;
  gap: 6px;
  margin-bottom: 14px;
}

.field span,
.check-field span {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  min-height: 42px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
}

.field textarea {
  min-height: 110px;
  resize: vertical;
}

.check-field {
  grid-template-columns: auto 1fr;
  align-items: center;
}

.admin-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto auto;
  gap: 12px;
  align-items: end;
}

.issue-form {
  display: grid;
  grid-template-columns: minmax(140px, 0.5fr) minmax(0, 1fr) auto;
  gap: 12px;
  align-items: end;
}

.issue-description {
  grid-column: 1 / -1;
}

.admin-users {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.admin-user {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.admin-user span {
  display: grid;
  gap: 2px;
}

.admin-user small,
.error {
  color: var(--muted);
}

.admin-block {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  margin-top: 24px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.admin-block h3 {
  margin: 0;
}

.diagnostics-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 24px;
}

.diagnostics-header h3 {
  margin: 0;
}

.diagnostic-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.diagnostic-item {
  display: grid;
  gap: 4px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.diagnostic-item span {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.login-main {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 24px;
}

.login-panel {
  width: min(420px, 100%);
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.error {
  min-height: 1.4em;
  margin: 14px 0 0;
}

@media (max-width: 720px) {
  .app-shell {
    width: min(100% - 24px, 920px);
    padding: 28px 0;
  }

  .status-grid {
    grid-template-columns: 1fr;
  }

  .admin-form,
  .issue-form,
  .admin-block,
  .diagnostic-grid {
    grid-template-columns: 1fr;
  }
}