:root {
  --ds-font: "IBM Plex Sans", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --ds-font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Consolas, monospace;
  --navy: #16202c;
  --teal: #3f8e8e;
  --green: #5b9f4e;
  --orange: #e0922f;
  --blue: #5bafd6;
  --red: #b0413e;
  --bg: #f4f6f8;
  --surface: #fff;
  --border: #e2e8f0;
  --divider: #edf1f5;
  --text: #1e293b;
  --label: #475569;
  --muted: #64748b;
  --faint: #94a3b8;
  --ds-r-btn: 6px;
  --ds-r-input: 6px;
  --ds-r-card: 10px;
  --ds-r-panel: 8px;
  --ds-r-tab: 6px;
  --ds-r-pill: 999px;
  --ds-shadow-card: 0 1px 2px rgba(15, 23, 42, .04);
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 14px/1.4 var(--ds-font);
}

button,
input,
select {
  font: inherit;
}

.app-header {
  min-height: 58px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 18px;
  padding: 0 24px;
  background: var(--navy);
  color: #fff;
}

.app-header__brand {
  font: 600 15px/1 var(--ds-font);
  letter-spacing: .02em;
  color: rgba(255, 255, 255, .82);
}

.app-header__title {
  margin: 0;
  font: 600 18px/1 var(--ds-font);
}

.ds-content {
  padding: 24px;
}

.app-shell {
  max-width: 1040px;
  margin: 0 auto;
}

.setup-card,
.setup-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--ds-r-card);
  box-shadow: var(--ds-shadow-card);
}

.setup-card {
  padding: 24px 28px 32px;
}

.setup-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 16px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--divider);
}

.eyebrow {
  margin: 0 0 7px;
  font: 600 12px/1.3 var(--ds-font);
  letter-spacing: .03em;
  text-transform: uppercase;
  color: var(--muted);
}

.ds-card-title {
  margin: 0;
  font: 600 16px/1.3 var(--ds-font);
  color: var(--navy);
}

.ds-chart-title {
  margin: 0;
  font: 600 13px/1.3 var(--ds-font);
  color: var(--label);
}

.ds-label {
  font: 500 13px/1.4 var(--ds-font);
  color: var(--label);
}

.status-pill {
  min-height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 10px;
  border-radius: var(--ds-r-pill);
  background: rgba(63, 142, 142, .12);
  color: #276f6f;
  font: 600 12px/1 var(--ds-font);
  white-space: nowrap;
}

.status-pill--muted {
  background: rgba(100, 116, 139, .16);
  color: #dbeafe;
}

.setup-card .status-pill--muted {
  color: var(--muted);
}

.status-pill--ok {
  background: rgba(91, 159, 78, .14);
  color: #386c30;
}

.app-header .status-pill--ok {
  background: #dcefd8;
  color: #305e2a;
}

.status-pill--warn {
  background: rgba(224, 146, 47, .16);
  color: #9b5d13;
}

.status-pill--bad {
  background: rgba(176, 65, 62, .14);
  color: #8a2f2c;
}

.transport-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 4px;
  padding: 4px;
  margin-bottom: 16px;
  background: #eef2f6;
  border: 1px solid var(--border);
  border-radius: var(--ds-r-panel);
}

.transport-tab {
  height: 38px;
  border: 0;
  border-radius: var(--ds-r-tab);
  background: transparent;
  color: var(--label);
  cursor: pointer;
  font: 600 14px/1 var(--ds-font);
}

.transport-tab:hover {
  color: var(--navy);
}

.transport-tab.is-active {
  background: var(--navy);
  color: #fff;
}

.transport-tab:disabled {
  cursor: not-allowed;
  opacity: .55;
}

.status-box {
  min-height: 42px;
  display: flex;
  align-items: center;
  padding: 10px 12px;
  margin-bottom: 20px;
  border-radius: var(--ds-r-panel);
  border: 1px solid var(--border);
  font: 400 14px/1.4 var(--ds-font);
}

.status-box--info {
  background: #f8fafc;
  color: var(--label);
}

.status-box--ok {
  border-color: rgba(91, 159, 78, .35);
  background: rgba(91, 159, 78, .08);
  color: #305e2a;
}

.status-box--warn {
  border-color: rgba(224, 146, 47, .36);
  background: rgba(224, 146, 47, .09);
  color: #7c4a11;
}

.status-box--bad {
  border-color: rgba(176, 65, 62, .35);
  background: rgba(176, 65, 62, .08);
  color: #782a28;
}

.setup-grid {
  display: grid;
  grid-template-columns: minmax(260px, .82fr) minmax(320px, 1.18fr);
  gap: 16px;
  align-items: start;
}

.setup-panel {
  min-width: 0;
  padding: 18px;
}

.section-heading {
  min-height: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.section-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.saved-networks {
  padding: 0 0 16px;
  margin: 0 0 16px;
  border-bottom: 1px solid var(--divider);
}

.saved-networks__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
  color: var(--label);
  font: 600 12px/1.4 var(--ds-font);
}

.saved-networks__count {
  min-width: 24px;
  text-align: right;
  color: var(--muted);
}

.saved-networks__list {
  display: grid;
  gap: 0;
  padding: 0;
  margin: 0;
  list-style: none;
}

.saved-networks__list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-width: 0;
  padding: 8px 0;
  border-top: 1px solid var(--divider);
}

.saved-networks__ssid {
  min-width: 0;
  overflow-wrap: anywhere;
  color: var(--text);
  font: 500 13px/1.4 var(--ds-font);
}

.saved-networks__security {
  flex: 0 0 auto;
  color: var(--muted);
  font: 400 11px/1.4 var(--ds-font);
}

.ds-btn {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 16px;
  border: 1px solid transparent;
  border-radius: var(--ds-r-btn);
  cursor: pointer;
  font: 600 14px/1 var(--ds-font);
  text-decoration: none;
}

.ds-btn--sm {
  min-height: 30px;
  padding: 0 14px;
  font-size: 13px;
}

.ds-btn--primary {
  background: var(--navy);
  color: #fff;
}

.ds-btn--primary:hover:not(:disabled) {
  background: #233245;
}

.ds-btn--secondary {
  background: #fff;
  border-color: var(--border);
  color: var(--navy);
}

.ds-btn--secondary:hover:not(:disabled) {
  border-color: #cbd5e1;
  background: #f8fafc;
}

.ds-btn:disabled {
  cursor: not-allowed;
  opacity: .55;
}

#connectBtn {
  width: 100%;
}

.device-meta {
  display: grid;
  gap: 12px;
  margin: 18px 0 0;
}

.device-meta div {
  display: grid;
  gap: 3px;
  padding-top: 12px;
  border-top: 1px solid var(--divider);
}

.device-meta dt {
  color: var(--muted);
  font: 600 11px/1.3 var(--ds-font);
  letter-spacing: .03em;
  text-transform: uppercase;
}

.device-meta dd {
  min-width: 0;
  margin: 0;
  overflow-wrap: anywhere;
  color: var(--text);
  font: 400 13px/1.4 var(--ds-font);
}

.wifi-form {
  display: grid;
  gap: 14px;
}

.field {
  display: grid;
  gap: 6px;
}

.check-field {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  min-height: 28px;
  color: var(--label);
  font: 400 13px/1.4 var(--ds-font);
  cursor: pointer;
}

.check-field input {
  width: 18px;
  height: 18px;
  margin: 0;
  accent-color: var(--teal);
}

.ds-input,
.ds-select {
  width: 100%;
  min-width: 0;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: var(--ds-r-input);
  background: #fff;
  color: var(--text);
  font: 400 14px/1.4 var(--ds-font);
}

.ds-input {
  padding: 0 12px;
}

.ds-select {
  padding: 0 36px 0 12px;
}

.ds-input:focus,
.ds-select:focus,
.transport-tab:focus-visible,
.ds-btn:focus-visible {
  outline: 2px solid rgba(63, 142, 142, .34);
  outline-offset: 2px;
}

.ds-input:disabled,
.ds-select:disabled {
  background: #f8fafc;
  color: var(--faint);
}

.ds-input--mono {
  font-family: var(--ds-font-mono);
}

.form-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 4px;
}

@media (max-width: 760px) {
  .app-header {
    grid-template-columns: 1fr auto;
    min-height: 62px;
    padding: 10px 16px;
  }

  .app-header__brand {
    display: none;
  }

  .app-header__title {
    font-size: 17px;
  }

  .ds-content {
    padding: 14px;
  }

  .setup-card {
    padding: 18px 14px 20px;
  }

  .setup-card__header {
    flex-direction: column;
    align-items: flex-start;
  }

  .setup-grid,
  .form-actions {
    grid-template-columns: 1fr;
  }

  .transport-tab {
    padding: 0 6px;
    font-size: 13px;
  }

  .section-heading {
    align-items: flex-start;
  }

  .section-actions {
    flex-wrap: wrap;
  }

  .transport-tab,
  .ds-btn,
  .ds-input,
  .ds-select {
    min-height: 44px;
  }
}