*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --ios-blue: #007AFF;
  --ios-red: #FF3B30;
  --ios-green: #34C759;
  --ios-gray: #8E8E93;
  --ios-gray2: #AEAEB2;
  --ios-gray5: #E5E5EA;
  --ios-gray6: #F2F2F7;
  --ios-label: #000000;
  --ios-secondary-label: #3C3C4399;
  --ios-separator: rgba(60, 60, 67, 0.12);
  --ios-card-bg: #FFFFFF;
  --ios-group-bg: #F2F2F7;
  --ios-nav-bg: rgba(249, 249, 249, 0.94);
  --ios-radius: 12px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', Arial, sans-serif;
  background: var(--ios-group-bg);
  color: var(--ios-label);
  line-height: 1.47;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Navigation bar ── */
.navbar {
  background: var(--ios-nav-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 0.5px solid var(--ios-separator);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar-brand {
  color: var(--ios-label);
  text-decoration: none;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.navbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  color: var(--ios-gray);
}

/* ── Container ── */
.container {
  max-width: 680px;
  margin: 0 auto;
  padding: 20px 16px 40px;
}

/* ── Typography ── */
h1 {
  font-size: 34px;
  font-weight: 700;
  letter-spacing: 0.37px;
  margin-bottom: 16px;
}

h2 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.35px;
  margin-top: 32px;
  margin-bottom: 12px;
}

/* ── iOS Grouped List (replaces table) ── */
.device-list {
  background: var(--ios-card-bg);
  border-radius: var(--ios-radius);
  overflow: hidden;
}

.device-card {
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: background-color 0.15s ease;
}

.device-card:not(:last-child) {
  border-bottom: 0.5px solid var(--ios-separator);
}

.device-card:active {
  background: var(--ios-gray6);
}

.device-card-info {
  flex: 1;
  min-width: 0;
}

.device-card-name {
  font-size: 17px;
  font-weight: 400;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.device-card-detail {
  font-size: 13px;
  color: var(--ios-gray);
  margin-top: 2px;
  letter-spacing: -0.01em;
}

.device-card-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.device-empty {
  padding: 24px 16px;
  text-align: center;
  color: var(--ios-gray);
  font-size: 15px;
  background: var(--ios-card-bg);
  border-radius: var(--ios-radius);
}

/* ── Badges ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.badge::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}

.badge-online {
  background: rgba(52, 199, 89, 0.14);
  color: #1B7D34;
}

.badge-online::before {
  background: var(--ios-green);
}

.badge-offline {
  background: rgba(142, 142, 147, 0.14);
  color: var(--ios-gray);
}

.badge-offline::before {
  background: var(--ios-gray2);
}

/* ── Mode pill ── */
.mode-pill {
  font-size: 12px;
  color: var(--ios-gray);
  background: var(--ios-gray6);
  padding: 2px 8px;
  border-radius: 6px;
  font-weight: 500;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 8px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  padding: 8px 16px;
  transition: opacity 0.15s ease, transform 0.1s ease;
  -webkit-tap-highlight-color: transparent;
}

.btn:active {
  opacity: 0.7;
  transform: scale(0.98);
}

.btn-primary {
  background: var(--ios-blue);
  color: #fff;
}

.btn-primary:hover {
  opacity: 0.88;
}

.btn-danger {
  background: transparent;
  color: var(--ios-red);
  padding: 8px 10px;
}

.btn-danger:hover {
  background: rgba(255, 59, 48, 0.08);
}

.btn-sm {
  font-size: 14px;
  padding: 6px 12px;
  border-radius: 7px;
}

.btn-link {
  background: transparent;
  color: var(--ios-blue);
  padding: 6px 10px;
  font-weight: 400;
}

.btn-link:hover {
  background: rgba(0, 122, 255, 0.06);
}

.btn-nav {
  background: transparent;
  color: var(--ios-blue);
  padding: 4px 8px;
  font-size: 15px;
  font-weight: 400;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-family: inherit;
}

.btn-nav:hover {
  background: rgba(0, 122, 255, 0.06);
}

/* ── Chevron disclosure indicator ── */
.chevron {
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--ios-gray2);
  border-bottom: 2px solid var(--ios-gray2);
  transform: rotate(-45deg);
  flex-shrink: 0;
}

/* ── Forms ── */
.ios-form-card {
  background: var(--ios-card-bg);
  border-radius: var(--ios-radius);
  overflow: hidden;
  margin-top: 8px;
}

.form-group {
  padding: 0 16px;
}

.form-group:not(:last-child) {
  border-bottom: 0.5px solid var(--ios-separator);
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--ios-gray);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  padding-top: 12px;
  margin-bottom: 0;
}

.form-group input,
.form-group select {
  width: 100%;
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: 17px;
  color: var(--ios-label);
  padding: 6px 0 12px;
  outline: none;
}

.form-group input::placeholder {
  color: var(--ios-gray2);
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
}

.form-group select {
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
  background: var(--ios-gray6) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%238E8E93' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat right 12px center;
  border-radius: 8px;
  padding: 10px 36px 10px 12px;
}

.form-actions {
  padding: 16px 0 0;
}

.form-inline {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.form-inline .ios-form-card {
  margin-top: 0;
}

.form-inline .form-actions {
  padding: 16px 0 0;
}

/* ── Section header (iOS grouped list) ── */
.section-header {
  font-size: 13px;
  font-weight: 400;
  color: var(--ios-gray);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  padding: 0 16px;
  margin-bottom: 8px;
}

/* ── Alerts ── */
.alert {
  padding: 12px 16px;
  border-radius: var(--ios-radius);
  margin-bottom: 16px;
  font-size: 15px;
  font-weight: 400;
}

.alert-success {
  background: rgba(52, 199, 89, 0.12);
  color: #1B7D34;
}

.alert-error {
  background: rgba(255, 59, 48, 0.12);
  color: var(--ios-red);
}

.error {
  color: var(--ios-red);
  font-size: 13px;
}

.help-text {
  font-size: 13px;
  color: var(--ios-gray);
  display: block;
  padding-bottom: 12px;
}

/* ── Device info card (configure page) ── */
.device-info {
  background: var(--ios-card-bg);
  border-radius: var(--ios-radius);
  padding: 0;
  margin-bottom: 24px;
  overflow: hidden;
}

.device-info-row {
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.device-info-row:not(:last-child) {
  border-bottom: 0.5px solid var(--ios-separator);
}

.device-info-row strong {
  font-size: 13px;
  font-weight: 500;
  color: var(--ios-gray);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.device-info code {
  font-family: 'SF Mono', 'Menlo', 'Monaco', 'Courier New', monospace;
  font-size: 13px;
  color: var(--ios-label);
  background: var(--ios-gray6);
  padding: 6px 10px;
  border-radius: 8px;
  word-break: break-all;
  display: block;
  margin-top: 4px;
}

/* ── Login ── */
.login-container {
  max-width: 380px;
  margin: 60px auto;
  padding: 0 16px;
}

.login-container h1 {
  text-align: center;
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 24px;
}

.login-card {
  background: var(--ios-card-bg);
  border-radius: var(--ios-radius);
  overflow: hidden;
}

.login-actions {
  padding: 20px 0 0;
}

.login-actions .btn-primary {
  width: 100%;
  padding: 12px;
  font-size: 17px;
  font-weight: 600;
  border-radius: var(--ios-radius);
}

/* ── Mode picker (big tappable buttons) ── */
.mode-picker {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 24px;
}

.mode-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 20px 12px;
  background: var(--ios-card-bg);
  border: 2.5px solid transparent;
  border-radius: var(--ios-radius);
  cursor: pointer;
  font-family: inherit;
  transition: border-color 0.15s ease, transform 0.1s ease;
  -webkit-tap-highlight-color: transparent;
}

.mode-option:active {
  transform: scale(0.97);
}

.mode-option.active {
  border-color: var(--ios-blue);
  background: rgba(0, 122, 255, 0.06);
}

.mode-icon {
  font-size: 32px;
  line-height: 1;
}

.mode-label {
  font-size: 15px;
  font-weight: 600;
  color: var(--ios-label);
}

.mode-option.active .mode-label {
  color: var(--ios-blue);
}

/* ── Mode panels ── */
.mode-panel {
  margin-bottom: 8px;
}

/* ── Clock confirm message ── */
.clock-confirm {
  background: var(--ios-card-bg);
  border-radius: var(--ios-radius);
  padding: 24px 16px;
  text-align: center;
  font-size: 17px;
}

/* ── Saved sources grid ── */
.saved-grid {
  display: flex;
  flex-direction: column;
  background: var(--ios-card-bg);
  border-radius: var(--ios-radius);
  overflow: hidden;
  margin-bottom: 0;
}

.saved-item {
  display: flex;
  align-items: stretch;
}

.saved-item:not(:last-child) {
  border-bottom: 0.5px solid var(--ios-separator);
}

.saved-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 16px;
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  transition: background-color 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.saved-btn:hover {
  background: rgba(0, 122, 255, 0.04);
}

.saved-btn:active {
  background: rgba(0, 122, 255, 0.10);
}

.saved-name {
  font-size: 17px;
  font-weight: 400;
  color: var(--ios-blue);
}

.saved-detail {
  font-size: 12px;
  color: var(--ios-gray);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.saved-delete {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  background: none;
  border: none;
  border-left: 0.5px solid var(--ios-separator);
  color: var(--ios-gray2);
  font-size: 20px;
  cursor: pointer;
  transition: color 0.15s ease, background-color 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.saved-delete:hover {
  color: var(--ios-red);
  background: rgba(255, 59, 48, 0.06);
}

/* ── Connection details (collapsible) ── */
.connection-details {
  margin-bottom: 24px;
}

.connection-details summary {
  list-style: none;
}

.connection-details summary::-webkit-details-marker {
  display: none;
}

.connection-details summary::after {
  content: ' ▸';
}

.connection-details[open] summary::after {
  content: ' ▾';
}

/* ── History chips (recent values) ── */
.history-chips {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding-bottom: 12px;
}

.history-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--ios-gray2);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-right: 2px;
}

.history-chip {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  background: var(--ios-gray6);
  border: 1.5px solid var(--ios-gray5);
  border-radius: 100px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  color: var(--ios-blue);
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
  -webkit-tap-highlight-color: transparent;
}

.history-chip:hover {
  background: rgba(0, 122, 255, 0.08);
  border-color: rgba(0, 122, 255, 0.25);
}

.history-chip:active {
  transform: scale(0.95);
}

.history-chip.active {
  background: rgba(0, 122, 255, 0.12);
  border-color: var(--ios-blue);
}

/* ── Utility ── */
.text-secondary {
  color: var(--ios-gray);
}

/* ── Responsive ── */
@media (max-width: 480px) {
  .container {
    padding: 16px 12px 32px;
  }

  h1 {
    font-size: 28px;
  }

  .mode-picker {
    gap: 8px;
  }

  .mode-option {
    padding: 14px 8px;
  }

  .mode-icon {
    font-size: 26px;
  }

  .device-card {
    flex-wrap: wrap;
  }

  .device-card-actions {
    width: 100%;
    justify-content: flex-end;
    padding-top: 8px;
    border-top: 0.5px solid var(--ios-separator);
    margin-top: 4px;
  }
}