/* ══════════════════════════════════════════════════════════════════
   AC Control PWA – style.css
   Dark navy theme with cyan accents, mobile-first layout.
══════════════════════════════════════════════════════════════════ */

/* ── Design tokens ── */
:root {
  --c-bg:          #0f172a;
  --c-surface:     #1e293b;
  --c-surface-hi:  #263553;
  --c-border:      #334155;
  --c-text:        #f1f5f9;
  --c-muted:       #94a3b8;
  --c-subtle:      #475569;
  --c-accent:      #38bdf8;
  --c-accent-hi:   #7dd3fc;

  --c-on:          #22c55e;
  --c-on-dim:      rgba(34, 197, 94, 0.14);
  --c-on-border:   rgba(34, 197, 94, 0.38);
  --c-on-glow:     rgba(34, 197, 94, 0.28);

  --c-off:         #ef4444;
  --c-off-dim:     rgba(239, 68, 68, 0.12);
  --c-off-border:  rgba(239, 68, 68, 0.32);
  --c-off-glow:    rgba(239, 68, 68, 0.28);

  --c-success-bg:  #052e16;
  --c-success-txt: #86efac;
  --c-success-bd:  rgba(34, 197, 94, 0.30);
  --c-error-bg:    #2d0a0a;
  --c-error-txt:   #fca5a5;
  --c-error-bd:    rgba(239, 68, 68, 0.30);

  --r-lg:  20px;
  --r-md:  12px;
  --r-sm:  8px;
  --r-pill: 999px;

  --shadow-card: 0 8px 40px rgba(0, 0, 0, 0.55);
  --tr: 0.18s ease;
}

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

html {
  -webkit-tap-highlight-color: transparent;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
               'Helvetica Neue', Arial, sans-serif;
  background: var(--c-bg);
  color: var(--c-text);
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  line-height: 1.5;
}

/* ══════════════════════════════════════════════════════════════════
   SCREENS
══════════════════════════════════════════════════════════════════ */
.screen {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
}
.screen.hidden { display: none; }

/* ══════════════════════════════════════════════════════════════════
   LOGIN SCREEN
══════════════════════════════════════════════════════════════════ */
#screen-login {
  align-items: center;
  justify-content: center;
  padding: 28px 20px;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, #1a3a5c 0%, transparent 70%),
    var(--c-bg);
}

.login-wrap {
  width: 100%;
  max-width: 380px;
}

/* Offline screen */
.offline-icon {
  text-align: center;
  margin-bottom: 20px;
}

.offline-icon svg {
  width: 72px;
  height: 72px;
}

.offline-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--c-text);
  text-align: center;
  margin-bottom: 8px;
}

.offline-msg {
  font-size: 0.85rem;
  color: var(--c-muted);
  text-align: center;
  line-height: 1.5;
  margin-bottom: 24px;
}

/* Brand header */
.brand {
  text-align: center;
  margin-bottom: 36px;
}

.brand-icon {
  width: 76px;
  height: 76px;
  margin-bottom: 16px;
  filter: drop-shadow(0 0 20px rgba(56, 189, 248, 0.45));
}

.brand h1 {
  font-size: 1.875rem;
  font-weight: 800;
  letter-spacing: -0.6px;
  color: var(--c-text);
}

.brand p {
  font-size: 0.875rem;
  color: var(--c-muted);
  margin-top: 5px;
}

/* Login card */
#form-login {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 28px 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: var(--shadow-card);
}

/* Field */
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--c-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.field input {
  background: var(--c-bg);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-sm);
  color: var(--c-text);
  font-size: 1rem;
  font-family: inherit;
  padding: 12px 14px;
  outline: none;
  transition: border-color var(--tr), box-shadow var(--tr);
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
}

.field input::placeholder { color: #3d5470; }

.field input:focus {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.18);
}

/* Login error */
.error-msg {
  font-size: 0.8125rem;
  color: var(--c-error-txt);
  background: var(--c-error-bg);
  border: 1px solid var(--c-error-bd);
  border-radius: var(--r-sm);
  padding: 9px 12px;
  text-align: center;
}

/* ══════════════════════════════════════════════════════════════════
   CONTROL SCREEN
══════════════════════════════════════════════════════════════════ */
#screen-control { background: var(--c-bg); }

/* Header */
header {
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  padding-top: env(safe-area-inset-top, 0);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 20px;
  max-width: 600px;
  margin: 0 auto;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--c-text);
  letter-spacing: -0.2px;
}

.header-icon {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
}

/* Back button (control screen header) */
.btn-back {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--c-muted);
  padding: 6px;
  margin-right: 4px;
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: color var(--tr);
}
.btn-back:hover { color: var(--c-accent); }
.btn-back svg { width: 22px; height: 22px; }

/* Main content area */
main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 28px 20px;
  padding-bottom: calc(28px + env(safe-area-inset-bottom, 0));
}

/* ── Device Dashboard ── */
.devices-main {
  align-items: flex-start;
  justify-content: flex-start;
}

.devices-wrap {
  width: 100%;
  max-width: 560px;
  margin: 0 auto;
}

.devices-title {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.4px;
  color: var(--c-text);
  margin-bottom: 4px;
}

.devices-subtitle {
  font-size: 0.875rem;
  color: var(--c-muted);
  margin-bottom: 20px;
}

.device-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 12px;
}

.device-card {
  background: var(--c-surface);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 22px 16px 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  transition: border-color var(--tr), box-shadow var(--tr), transform var(--tr);
  font-family: inherit;
  color: var(--c-text);
  text-align: center;
}

.device-card:hover {
  border-color: var(--c-accent);
  box-shadow: 0 4px 24px rgba(56, 189, 248, 0.15);
  transform: translateY(-2px);
}

.device-card:active {
  transform: scale(0.97);
}

.device-icon {
  width: 48px;
  height: 48px;
  color: var(--c-accent);
}

.device-icon svg {
  width: 100%;
  height: 100%;
}

.device-name {
  font-size: 0.875rem;
  font-weight: 700;
  line-height: 1.3;
}

.device-status {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--c-muted);
}

.device-status-on  { color: var(--c-on); }
.device-status-off { color: var(--c-off); }

.devices-loading {
  text-align: center;
  color: var(--c-muted);
  font-size: 0.85rem;
  padding: 40px 0;
}

.devices-empty {
  text-align: center;
  color: var(--c-subtle);
  font-size: 0.85rem;
  padding: 40px 0;
}

/* Control card */
.control-card {
  width: 100%;
  max-width: 480px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 28px 24px 32px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
}

/* Status pill */
.status-wrap {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--r-pill);
  padding: 6px 14px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--c-muted);
  transition: border-color var(--tr), color var(--tr);
  user-select: none;
}

.status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
  transition: background var(--tr), box-shadow var(--tr);
}

.status-idle  { background: var(--c-muted); }

.status-on {
  background: var(--c-on);
  box-shadow: 0 0 8px var(--c-on);
  animation: pulse-on 2.2s ease-in-out infinite;
}

.status-off { background: var(--c-off); }
.status-error { background: var(--c-off); }

@keyframes pulse-on {
  0%, 100% { box-shadow: 0 0 6px var(--c-on); }
  50%       { box-shadow: 0 0 16px var(--c-on), 0 0 28px var(--c-on); }
}

/* AC Illustration */
.ac-visual {
  width: 100%;
  max-width: 300px;
}

.ac-visual svg {
  width: 100%;
  height: auto;
  overflow: visible;
}

/* Airflow animation */
#airflow path {
  stroke-dasharray: 55;
  stroke-dashoffset: 55;
  animation: airflow-move 2.4s ease-in-out infinite;
}

#airflow path:nth-child(2) { animation-delay: 0.35s; }
#airflow path:nth-child(3) { animation-delay: 0.70s; }

@keyframes airflow-move {
  0%   { stroke-dashoffset: 55; opacity: 0; }
  25%  { opacity: 1; }
  75%  { opacity: 0.6; }
  100% { stroke-dashoffset: -55; opacity: 0; }
}

#airflow.hidden { display: none; }

/* Subtitle */
.control-subtitle {
  font-size: 0.875rem;
  color: var(--c-muted);
  margin-top: -8px;
  text-align: center;
}

/* Button grid */
.btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  width: 100%;
}

.btn-row-center {
  display: flex;
  justify-content: center;
  width: 100%;
}

.btn-refresh {
  gap: 7px;
  font-size: 0.85rem;
  padding: 9px 20px;
  color: var(--c-muted);
}

.btn-refresh:hover:not(:disabled) {
  color: var(--c-accent);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.spin {
  animation: spin 0.7s linear infinite;
}

/* AC Status Grid */
.ac-status-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  width: 100%;
  background: var(--c-border);     /* gap colour between cells */
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  overflow: hidden;
}

.ac-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  background: var(--c-bg);
  padding: 12px 6px;
}

.ac-stat-label {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--c-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.ac-stat-val {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--c-text);
  font-variant-numeric: tabular-nums;
  transition: color var(--tr);
}

.ac-stat-val[data-state="on"]  { color: var(--c-on); }
.ac-stat-val[data-state="off"] { color: var(--c-off); }

/* ── Language switcher ── */
.lang-switcher {
  position: fixed;
  top: 14px;
  right: 14px;
  z-index: 200;
  display: flex;
  gap: 2px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-pill);
  padding: 3px;
}

.lang-btn {
  background: none;
  border: none;
  color: var(--c-muted);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: 4px 10px;
  border-radius: var(--r-pill);
  cursor: pointer;
  transition: background var(--tr), color var(--tr);
  line-height: 1;
}

.lang-btn:hover {
  color: var(--c-text);
}

.lang-btn.active {
  background: var(--c-accent);
  color: #0f172a;
}

/* ── Schedule section ── */
.schedule-section {
  width: 100%;
  border-top: 1px solid var(--c-border);
  padding-top: 18px;
}

.section-title {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--c-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-bottom: 12px;
}

.schedule-form-row {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 14px;
}

.sched-select {
  flex: 1;
  min-width: 0;
  background: var(--c-bg);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-sm);
  color: var(--c-text);
  padding: 9px 10px;
  font-size: 0.82rem;
  font-family: inherit;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2394a3b8' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 28px;
}

.sched-select:focus {
  outline: none;
  border-color: var(--c-accent);
}

.sched-select option {
  background: var(--c-surface);
  color: var(--c-text);
}

.sched-delay-group {
  display: flex;
  align-items: center;
  background: var(--c-bg);
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-sm);
  padding-right: 8px;
  overflow: hidden;
  flex-shrink: 0;
}

.sched-input {
  width: 52px;
  background: transparent;
  border: none;
  color: var(--c-text);
  padding: 9px 6px 9px 10px;
  font-size: 0.82rem;
  font-family: inherit;
  text-align: center;
  -moz-appearance: textfield;
}

.sched-input::-webkit-inner-spin-button,
.sched-input::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.sched-input:focus { outline: none; }

.sched-delay-group:focus-within {
  border-color: var(--c-accent);
}

.sched-unit {
  font-size: 0.7rem;
  color: var(--c-muted);
  font-weight: 600;
  white-space: nowrap;
}

.btn-accent {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.82rem;
  background: var(--c-accent);
  color: #0c1627;
  border: 1.5px solid var(--c-accent);
  border-radius: var(--r-sm);
  padding: 8px 14px;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--tr), box-shadow var(--tr);
}

.btn-accent:hover:not(:disabled) {
  background: var(--c-accent-hi);
  border-color: var(--c-accent-hi);
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.3);
}

.btn-accent:active:not(:disabled) { transform: scale(0.95); }

.btn-accent:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-icon-sm {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.schedule-list {
  list-style: none;
}

.sched-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  margin-bottom: 6px;
}

.sched-item:last-child { margin-bottom: 0; }

.sched-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sched-action {
  font-size: 0.82rem;
  font-weight: 700;
}

.sched-action-on  { color: var(--c-on); }
.sched-action-off { color: var(--c-off); }

.sched-countdown {
  font-size: 0.72rem;
  color: var(--c-muted);
}

.sched-cancel {
  background: none;
  border: 1px solid var(--c-border);
  color: var(--c-muted);
  border-radius: var(--r-sm);
  padding: 4px 12px;
  font-size: 0.72rem;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: color var(--tr), border-color var(--tr);
}

.sched-cancel:hover {
  color: var(--c-off);
  border-color: var(--c-off);
}

.sched-empty {
  text-align: center;
  color: var(--c-subtle);
  font-size: 0.8rem;
  padding: 14px 0;
}

/* ── Bottom logout button ── */
.btn-logout-bottom {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  margin-top: 28px;
  padding: 10px 0;
  background: none;
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  color: var(--c-subtle);
  font-size: 0.78rem;
  font-family: inherit;
  cursor: pointer;
  transition: color var(--tr), border-color var(--tr);
}

.btn-logout-bottom:hover {
  color: var(--c-off);
  border-color: var(--c-off);
}

/* Network footer */
.network-info {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.72rem;
  color: var(--c-subtle);
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  margin-top: -6px;
  user-select: none;
}

/* ══════════════════════════════════════════════════════════════════
   BUTTONS
══════════════════════════════════════════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-weight: 700;
  border: 1.5px solid transparent;
  border-radius: var(--r-md);
  cursor: pointer;
  transition:
    transform var(--tr),
    box-shadow var(--tr),
    background var(--tr),
    border-color var(--tr),
    opacity var(--tr);
  -webkit-user-select: none;
  user-select: none;
  position: relative;
  text-decoration: none;
}

.btn:active:not(:disabled) { transform: scale(0.95); }

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none !important;
}

.btn-full { width: 100%; }

/* Primary – used for Sign In */
.btn-primary {
  background: var(--c-accent);
  color: #0c1627;
  padding: 13px 20px;
  font-size: 1rem;
  border-color: var(--c-accent);
  border-radius: var(--r-md);
}

.btn-primary:hover:not(:disabled) {
  background: var(--c-accent-hi);
  border-color: var(--c-accent-hi);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.35);
}

/* Ghost – used for Logout */
.btn-ghost {
  background: transparent;
  color: var(--c-muted);
  border-color: var(--c-border);
  padding: 7px 13px;
  font-size: 0.8125rem;
  border-radius: var(--r-sm);
}

.btn-ghost:hover:not(:disabled) {
  color: var(--c-text);
  border-color: var(--c-accent);
}

.btn-ghost svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

/* Power ON */
.btn-on {
  background: var(--c-on-dim);
  color: var(--c-on);
  border-color: var(--c-on-border);
  padding: 22px 10px;
  flex-direction: column;
  gap: 10px;
  font-size: 0.9375rem;
}

.btn-on:hover:not(:disabled) {
  background: rgba(34, 197, 94, 0.22);
  border-color: var(--c-on);
  box-shadow: 0 0 28px var(--c-on-glow);
}

.btn-on.active {
  background: rgba(34, 197, 94, 0.22);
  border-color: var(--c-on);
  box-shadow: 0 0 28px var(--c-on-glow);
}

/* Power OFF */
.btn-off {
  background: var(--c-off-dim);
  color: var(--c-off);
  border-color: var(--c-off-border);
  padding: 22px 10px;
  flex-direction: column;
  gap: 10px;
  font-size: 0.9375rem;
}

.btn-off:hover:not(:disabled) {
  background: rgba(239, 68, 68, 0.22);
  border-color: var(--c-off);
  box-shadow: 0 0 28px var(--c-off-glow);
}

.btn-off.active {
  background: rgba(239, 68, 68, 0.22);
  border-color: var(--c-off);
  box-shadow: 0 0 28px var(--c-off-glow);
}

.btn-icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

/* Inline spinner (inside login button) */
.btn-spinner {
  width: 18px;
  height: 18px;
  border: 2.5px solid rgba(12, 22, 39, 0.35);
  border-top-color: #0c1627;
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
  flex-shrink: 0;
}

/* ══════════════════════════════════════════════════════════════════
   TOAST NOTIFICATIONS
══════════════════════════════════════════════════════════════════ */
#toast-container {
  position: fixed;
  bottom: 24px;
  bottom: calc(24px + env(safe-area-inset-bottom, 0));
  left: 50%;
  transform: translateX(-50%);
  width: min(360px, calc(100vw - 32px));
  display: flex;
  flex-direction: column-reverse;
  gap: 8px;
  z-index: 1000;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 15px;
  border-radius: var(--r-md);
  border: 1px solid transparent;
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.4;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.5);
  pointer-events: auto;
  cursor: pointer;
  animation: toast-in 0.28s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

.toast.toast-dismiss {
  animation: toast-out 0.22s ease-in both;
}

.toast-success {
  background: var(--c-success-bg);
  color: var(--c-success-txt);
  border-color: var(--c-success-bd);
}

.toast-error {
  background: var(--c-error-bg);
  color: var(--c-error-txt);
  border-color: var(--c-error-bd);
}

.toast-info {
  background: var(--c-surface);
  color: var(--c-text);
  border-color: var(--c-border);
}

.toast-icon {
  font-size: 0.9375rem;
  flex-shrink: 0;
  margin-top: 1px;
}

.toast-msg { flex: 1; }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(18px) scale(0.94); }
  to   { opacity: 1; transform: translateY(0)    scale(1); }
}

@keyframes toast-out {
  from { opacity: 1; transform: translateY(0)   scale(1); }
  to   { opacity: 0; transform: translateY(10px) scale(0.95); }
}

/* ══════════════════════════════════════════════════════════════════
   LOADING OVERLAY
══════════════════════════════════════════════════════════════════ */
#loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.72);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 900;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

#loading-overlay.hidden { display: none; }

.spinner-ring {
  width: 52px;
  height: 52px;
  border: 4px solid var(--c-border);
  border-top-color: var(--c-accent);
  border-radius: 50%;
  animation: spin 0.72s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ══════════════════════════════════════════════════════════════════
   UTILITIES
══════════════════════════════════════════════════════════════════ */
.hidden { display: none !important; }

/* ══════════════════════════════════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════════════════════════════════ */
/* Narrow phones: stack power buttons vertically */
@media (max-width: 340px) {
  .btn-row {
    grid-template-columns: 1fr;
  }

  .btn-on,
  .btn-off {
    flex-direction: row;
    padding: 16px 20px;
  }

  .btn-icon {
    width: 22px;
    height: 22px;
  }
}

/* Larger screens: extra breathing room */
@media (min-width: 600px) {
  .btn-on,
  .btn-off {
    padding: 30px 16px;
  }

  .brand-icon {
    width: 92px;
    height: 92px;
  }
}