:root {
  --navy: #0F172A;
  --navy-hover: #020617;
  --slate: #64748B;
  --sage: #059669;
  --sage-hover: #047857;
  --bg: #F8FAFC;
  --surface: #FFFFFF;
  --border: #E2E8F0;
  --border-hover: #0F172A;
  --success: #22C55E;
  --warning: #EAB308;
  --error: #EF4444;
  --info: #0EA5E9;
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #64748B;
  --focus-ring: 0 0 0 3px rgba(15, 23, 42, 0.10);

  --radius-sm: 4px;
  --radius: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.07);

  --font-head: 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --font-mono: 'Fira Code', monospace;
}

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

html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  margin: 0;
  font-weight: 600;
  line-height: 1.25;
  color: var(--text-primary);
}

p { margin: 0; }

.screen {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.hidden { display: none !important; }

/* Brand */
.brand-mark {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  font-size: 28px;
  line-height: 1;
}

.brand-text h1 {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.2;
}

.brand-text p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.brand-name {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 14px;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 150ms ease, border-color 150ms ease, box-shadow 150ms ease;
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.btn:disabled, .btn[aria-disabled="true"] {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-sm { padding: 6px 14px; height: 32px; font-size: 13px; }
.btn-md { padding: 10px 22px; height: 42px; }
.btn-lg { padding: 12px 28px; height: 48px; font-size: 16px; }

.btn-primary {
  background: var(--navy);
  color: #fff;
}
.btn-primary:hover:not(:disabled) { background: var(--navy-hover); }

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-hover);
}
.btn-secondary:hover:not(:disabled) { background: rgba(15, 23, 42, 0.04); }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: transparent;
}
.btn-ghost:hover:not(:disabled) { background: #F1F5F9; }

.btn-destructive {
  background: var(--error);
  color: #fff;
}
.btn-destructive:hover:not(:disabled) { background: #DC2626; }

.btn-sage {
  background: var(--sage);
  color: #fff;
}
.btn-sage:hover:not(:disabled) { background: var(--sage-hover); }

/* Login */
.login-card {
  width: 100%;
  max-width: 400px;
  margin: auto;
  padding: 40px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

.login-card .brand-mark {
  justify-content: center;
  margin-bottom: 32px;
}

.login-card .brand-icon { font-size: 40px; }
.login-card .brand-text h1 { font-size: 28px; text-align: center; }
.login-card .brand-text p { text-align: center; }

.login-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.login-form label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.login-form input {
  height: 42px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 14px;
  margin-bottom: 12px;
}

.login-form input:hover { border-color: var(--border-hover); }
.login-form input:focus {
  outline: none;
  border-color: var(--border-hover);
  box-shadow: var(--focus-ring);
}

.error-message {
  font-size: 13px;
  color: var(--error);
  margin: 8px 0 0;
  min-height: 18px;
}

/* App Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 32px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.header-meta {
  display: flex;
  align-items: center;
  gap: 16px;
}

.clock {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

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

/* Main */
.app-main {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 48px 32px 64px;
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.dashboard-section {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.section-header h2 {
  font-size: 24px;
  font-weight: 600;
}

.section-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Device card */
.device-card {
  display: flex;
  flex-direction: column;
  gap: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.device-status {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 600;
}

.device-dot {
  width: 10px;
  height: 10px;
  border-radius: 9999px;
}

.device-dot.active { background: var(--success); }
.device-dot.inactive { background: var(--error); }

.device-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
}

.metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.metric-label {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--text-primary);
}

/* Slots */
.slots-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.slot-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

.slot-card:hover {
  border-color: #CBD5E1;
  box-shadow: var(--shadow-md);
}

.slot-card.active {
  border-color: var(--warning);
  background: #FEFCE8;
}

.slot-card.disabled {
  opacity: 0.65;
  background: #F8FAFC;
}

.slot-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.slot-id {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.slot-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
}

.slot-toggle input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--navy);
  cursor: pointer;
}

.slot-time {
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1;
  letter-spacing: -0.02em;
}

.slot-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.slot-label {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.slot-pills {
  font-size: 14px;
  color: var(--text-secondary);
}

.slot-controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.slot-controls input,
.slot-controls select {
  height: 42px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 14px;
  width: 100%;
}

.slot-controls input:hover,
.slot-controls select:hover { border-color: var(--border-hover); }

.slot-controls input:focus,
.slot-controls select:focus {
  outline: none;
  border-color: var(--border-hover);
  box-shadow: var(--focus-ring);
}

.slot-row {
  display: flex;
  gap: 12px;
}

.slot-row > * { flex: 1; min-width: 0; }

.slot-actions {
  display: flex;
  gap: 8px;
  margin-top: 4px;
}

.slot-actions .btn { flex: 1; }

.status-chip {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.status-chip.active {
  background: rgba(234, 179, 8, 0.12);
  color: #CA8A04;
}

.status-chip.inactive {
  background: #F1F5F9;
  color: var(--text-muted);
}

/* Logs */
.logs-list {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  max-height: 360px;
  overflow-y: auto;
}

.log-item {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: start;
  gap: 16px;
  padding: 14px 20px;
  border-bottom: 1px solid #F1F5F9;
}

.log-item:last-child { border-bottom: none; }

.log-time {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
  white-space: nowrap;
}

.log-type {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.log-type.alarm { background: rgba(239, 68, 68, 0.10); color: #DC2626; }
.log-type.update { background: rgba(234, 179, 8, 0.12); color: #CA8A04; }
.log-type.off { background: rgba(239, 68, 68, 0.10); color: #DC2626; }
.log-type.taken { background: rgba(34, 197, 94, 0.10); color: #16A34A; }
.log-type.missed { background: rgba(239, 68, 68, 0.10); color: #DC2626; }
.log-type.config { background: rgba(14, 165, 233, 0.10); color: #0284C7; }
.log-type.boot, .log-type.reset { background: #F1F5F9; color: var(--text-muted); }

.log-message {
  font-size: 14px;
  color: var(--text-primary);
}

.logs-empty {
  padding: 32px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 14px;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.40);
}

.modal-card {
  position: relative;
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 24px;
  margin: 24px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.modal-header h2 { font-size: 20px; }

.config-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
}

.form-group input {
  height: 42px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 14px;
}

.form-group input:hover { border-color: var(--border-hover); }
.form-group input:focus {
  outline: none;
  border-color: var(--border-hover);
  box-shadow: var(--focus-ring);
}

.field-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 8px;
}

/* Alarm */
.alarm-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(15, 23, 42, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.alarm-card {
  width: 100%;
  max-width: 420px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 40px;
  text-align: center;
  box-shadow: var(--shadow-md);
}

.alarm-icon {
  font-size: 56px;
  line-height: 1;
  margin-bottom: 16px;
}

.alarm-card h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
}

.alarm-desc {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--navy);
  color: #fff;
  padding: 12px 18px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  z-index: 200;
}

/* Debug panel */
.debug-panel {
  position: fixed;
  top: 80px;
  left: 16px;
  right: 16px;
  max-height: 200px;
  overflow-y: auto;
  background: #0F172A;
  color: #F8FAFC;
  border: 1px solid #334155;
  border-radius: var(--radius);
  padding: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  z-index: 300;
}
.debug-panel pre { margin: 8px 0 0; white-space: pre-wrap; word-break: break-all; }

/* Mobile */
@media (max-width: 768px) {
  .app-header {
    flex-direction: column;
    align-items: flex-start;
    padding: 16px;
    gap: 12px;
  }

  .header-meta {
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .header-actions {
    width: 100%;
    flex-wrap: wrap;
  }

  .header-actions .btn { flex: 1; min-width: 100px; }

  .app-main { padding: 32px 16px 48px; gap: 40px; }

  .slots-grid { grid-template-columns: 1fr; gap: 16px; }

  .slot-card { padding: 20px; }

  .slot-time { font-size: 36px; }

  .log-item {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .login-card {
    margin: 24px 16px auto;
    padding: 28px 24px;
  }

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

  .device-metrics { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .slot-actions {
    flex-direction: column;
  }

  .device-metrics { grid-template-columns: 1fr; }
}