:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #172026;
  --muted: #5f6b76;
  --line: #dce2e8;
  --accent: #176b87;
  --accent-dark: #0f4d62;
  --ok: #1f7a4f;
  --warn: #986b13;
  --danger: #a83b3b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 "Segoe UI", Arial, sans-serif;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 56px;
  padding: 0 24px;
  border-bottom: 1px solid var(--line);
  background: #10232e;
  color: #fff;
}

.brand {
  color: #fff;
  font-weight: 700;
  letter-spacing: 0;
}

.topbar nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.topbar nav a {
  color: #d9edf4;
}

.page {
  width: min(1400px, calc(100% - 40px));
  margin: 24px auto 48px;
}

.page-head,
.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 4px;
  font-size: 28px;
}

h2 {
  margin-bottom: 14px;
  font-size: 18px;
}

h3 {
  margin-bottom: 8px;
  font-size: 15px;
}

p,
.note {
  color: var(--muted);
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.version-map {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.version-map span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 10px;
  background: #fff;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.metric,
.panel {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
}

.metric {
  padding: 16px;
}

.metric span {
  display: block;
  font-size: 26px;
  font-weight: 700;
}

.metric strong {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
}

.safety-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
  border: 1px solid var(--line);
  border-left-width: 6px;
  border-radius: 6px;
  padding: 14px 16px;
  background: #fff;
}

.safety-bar.locked {
  border-left-color: var(--ok);
}

.safety-bar.unlocked {
  border-left-color: var(--warn);
  background: #fff8eb;
}

.safety-bar strong,
.safety-bar span {
  display: inline-block;
  margin-right: 8px;
  font-weight: 700;
}

.safety-bar p {
  margin: 4px 0 0;
}

.warning-button {
  border-color: #7a520a;
  background: var(--warn);
}

.warning-button:hover {
  background: #7a520a;
}

.danger-button {
  border-color: #7e2828;
  background: var(--danger);
}

.danger-button:hover {
  background: #7e2828;
}

.secondary-button {
  border-color: #53606b;
  background: #677684;
}

.secondary-button:hover {
  background: #53606b;
}

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

.two-column,
.split {
  display: grid;
  grid-template-columns: minmax(280px, 380px) minmax(0, 1fr);
  gap: 18px;
}

.two-column {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.panel {
  padding: 18px;
  overflow-x: auto;
}

.wide {
  min-width: 0;
}

.subsection {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.subsection:first-child {
  padding-top: 0;
  border-top: 0;
}

.qr-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 16px;
}

.qr-card {
  display: grid;
  grid-template-columns: 176px minmax(0, 1fr);
  gap: 16px;
  min-height: 208px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 16px;
  background: #fff;
}

.qr-card.used {
  opacity: 0.68;
}

.qr-image {
  display: grid;
  place-items: center;
  width: 176px;
  height: 176px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #fff;
}

.qr-image img {
  width: 160px;
  height: 160px;
  object-fit: contain;
}

.qr-details dl {
  display: grid;
  gap: 6px;
  margin: 12px 0;
}

.qr-details dl div {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 8px;
}

.qr-details dt {
  color: var(--muted);
  font-weight: 700;
}

.qr-details dd {
  margin: 0;
}

.phone-pair-page {
  max-width: 980px;
  margin: 0 auto;
}

.phone-pair-head {
  margin-bottom: 20px;
}

.install-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.step-card {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 16px;
  background: #fff;
}

.step-card span {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  margin-bottom: 12px;
  border-radius: 50%;
  background: #10232e;
  color: #fff;
  font-weight: 700;
}

.step-card .button {
  width: 100%;
}

.experimental-panel {
  margin-bottom: 18px;
}

.pairing-detail-list {
  display: grid;
  gap: 10px;
  margin: 0 0 16px;
}

.pairing-detail-list div {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 10px;
}

.pairing-detail-list dt {
  color: var(--muted);
  font-weight: 700;
}

.pairing-detail-list dd {
  margin: 0;
}

details {
  margin-top: 10px;
}

summary {
  cursor: pointer;
  color: var(--accent);
  font-weight: 700;
}

pre {
  max-height: 180px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 10px;
  background: #f7f8fa;
  white-space: pre-wrap;
}

form label {
  display: grid;
  gap: 6px;
  margin-bottom: 12px;
  color: var(--muted);
  font-weight: 600;
}

.inline-form label {
  margin-bottom: 0;
}

input,
select,
textarea {
  width: 100%;
  min-height: 36px;
  border: 1px solid #cbd4dc;
  border-radius: 4px;
  padding: 8px 10px;
  background: #fff;
  color: var(--text);
  font: inherit;
}

textarea {
  resize: vertical;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
}

.checkbox input {
  width: auto;
  min-height: auto;
}

button,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  border: 1px solid var(--accent-dark);
  border-radius: 4px;
  padding: 8px 12px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  font: inherit;
  font-weight: 600;
}

button:hover,
.button:hover {
  background: var(--accent-dark);
  text-decoration: none;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}

th,
td {
  padding: 10px 9px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
}

code {
  word-break: break-word;
  color: #314653;
}

.pill {
  display: inline-block;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 8px;
  background: #eef4f7;
  color: #314653;
  font-size: 12px;
}

.messages {
  margin-bottom: 16px;
}

.message {
  margin-bottom: 8px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 4px;
  padding: 10px 12px;
  background: #fff;
}

.message.error {
  border-left-color: var(--danger);
}

.message.success {
  border-left-color: var(--ok);
}

.mini-form {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) minmax(120px, 1fr) auto auto;
  gap: 8px;
}

@media (max-width: 900px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
    padding: 12px 16px;
  }

  .page {
    width: min(100% - 24px, 1400px);
  }

  .page-head,
  .section-title,
  .safety-bar,
  .split,
  .two-column {
    display: block;
  }

  .panel,
  .metric-grid {
    margin-bottom: 16px;
  }

  .mini-form {
    grid-template-columns: 1fr;
  }

  .qr-card {
    grid-template-columns: 1fr;
  }

  .qr-image {
    width: 100%;
  }

  .install-steps {
    grid-template-columns: 1fr;
  }

  .pairing-detail-list div {
    grid-template-columns: 1fr;
  }
}