/* ── Base & tokens ─────────────────────────────────────────────── */
:root {
  --color-primary:           #1565C0;
  --color-primary-dark:      #0D47A1;
  --color-on-primary:        #FFFFFF;
  --color-primary-container: #BBDEFB;

  --color-background:        #EEF2F7;
  --color-surface:           #FFFFFF;
  --color-surface-variant:   #F3F6FB;
  --color-on-surface:        #1A1C1E;
  --color-on-surface-muted:  #5C6370;
  --color-outline:           #C3C7CF;

  --color-success:           #2E7D32;
  --color-success-bg:        #E8F5E9;
  --color-warning:           #E65100;
  --color-warning-bg:        #FFF3E0;
  --color-error:             #C62828;
  --color-error-bg:          #FFEBEE;
  --color-neutral:           #546E7A;
  --color-neutral-bg:        #ECEFF1;

  --shadow-card: 0 1px 3px rgba(0,0,0,.08), 0 4px 12px rgba(0,0,0,.06);
  --shadow-card-hover: 0 4px 8px rgba(0,0,0,.1), 0 8px 24px rgba(0,0,0,.1);

  --radius-card: 16px;
  --radius-chip: 20px;

  --font: 'Roboto', system-ui, sans-serif;
}

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

[hidden] { display: none !important; }

body {
  font-family: var(--font);
  background: var(--color-background);
  color: var(--color-on-surface);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── Top App Bar ───────────────────────────────────────────────── */
.app-bar {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-on-primary);
  height: 64px;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 2px 8px rgba(0,0,0,.2);
}

.app-bar-icon {
  font-size: 28px;
  opacity: .95;
}

.app-bar-title {
  font-size: 20px;
  font-weight: 500;
  letter-spacing: .015em;
  flex: 1;
}

.app-bar-meta {
  font-size: 12px;
  font-weight: 400;
  opacity: .75;
  text-align: right;
  line-height: 1.4;
}

/* ── Refresh interval select ───────────────────────────────────── */
.refresh-select {
  appearance: none;
  -webkit-appearance: none;
  background: rgba(255,255,255,.15);
  color: var(--color-on-primary);
  border: 1px solid rgba(255,255,255,.3);
  border-radius: var(--radius-chip);
  padding: 5px 28px 5px 12px;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  outline: none;
  /* chevron icon inline */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 6px center;
  transition: background-color .2s, border-color .2s;
}
.refresh-select:hover {
  background-color: rgba(255,255,255,.25);
  border-color: rgba(255,255,255,.5);
}
.refresh-select option {
  background: var(--color-primary-dark);
  color: var(--color-on-primary);
}

.icon-btn {
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  color: var(--color-on-primary);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .2s;
  margin-left: 4px;
}
.icon-btn:hover { background: rgba(255,255,255,.15); }
.icon-btn:active { background: rgba(255,255,255,.25); }
.icon-btn .material-symbols-rounded { font-size: 22px; }
.icon-btn.spinning .material-symbols-rounded {
  animation: spin .8s linear infinite;
}

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

/* ── Main layout ───────────────────────────────────────────────── */
.main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px 20px 48px;
}

.section-label {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--color-on-surface-muted);
  margin-bottom: 16px;
}

/* ── Device grid ───────────────────────────────────────────────── */
.devices-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 18px;
}

/* ── Device card ───────────────────────────────────────────────── */
.device-card {
  background: var(--color-surface);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: box-shadow .25s, transform .2s;
}

.control-card {
  cursor: pointer;
}

.control-card:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.control-card[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: .82;
}

.device-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 20px 20px 14px;
}

.card-name {
  font-size: 17px;
  font-weight: 500;
  line-height: 1.3;
  color: var(--color-on-surface);
  flex: 1;
  min-width: 0;
  word-break: break-word;
}

/* ── Status chip ───────────────────────────────────────────────── */
.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px 4px 8px;
  border-radius: var(--radius-chip);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .03em;
  white-space: nowrap;
  flex-shrink: 0;
}
.status-chip .material-symbols-rounded { font-size: 14px; }

.chip-on   { background: var(--color-success-bg); color: var(--color-success); }
.chip-off  { background: var(--color-neutral-bg); color: var(--color-neutral); }

/* ── Divider ───────────────────────────────────────────────────── */
.card-divider {
  height: 1px;
  background: var(--color-outline);
  opacity: .35;
  margin: 0 20px;
}

/* ── Stats ─────────────────────────────────────────────────────── */
.card-stats {
  display: flex;
  gap: 0;
  padding: 16px 12px 18px;
}

.card-control-hint {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 0 14px 14px;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--color-surface-variant);
  color: var(--color-on-surface-muted);
  font-size: 12px;
  font-weight: 500;
}

.card-control-hint .material-symbols-rounded {
  font-size: 16px;
}

.stat {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  padding: 6px 8px;
  border-radius: 12px;
  transition: background .15s;
}
.stat:hover { background: var(--color-surface-variant); }

.stat-icon {
  font-size: 22px;
}
.stat-icon.temp   { color: #1565C0; }
.stat-icon.energy { color: #E65100; }

.stat-value {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--color-on-surface);
  line-height: 1;
}
.stat-value.unavailable {
  font-size: 14px;
  font-weight: 400;
  color: var(--color-on-surface-muted);
}

.stat-label {
  font-size: 11px;
  font-weight: 400;
  color: var(--color-on-surface-muted);
  text-align: center;
  letter-spacing: .02em;
}

/* ── Offline banner ────────────────────────────────────────────── */
.offline-banner {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--color-error-bg);
  color: var(--color-error);
  font-size: 12px;
  font-weight: 500;
  padding: 8px 20px;
}
.offline-banner .material-symbols-rounded { font-size: 16px; }

/* ── Loading skeletons ─────────────────────────────────────────── */
@keyframes shimmer {
  0%   { background-position: -600px 0; }
  100% { background-position:  600px 0; }
}

.skeleton-card {
  background: var(--color-surface);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.skeleton-line {
  border-radius: 6px;
  background: linear-gradient(90deg, #E0E0E0 25%, #F0F0F0 50%, #E0E0E0 75%);
  background-size: 600px 100%;
  animation: shimmer 1.5s infinite linear;
}

.skel-title   { height: 18px; width: 60%; }
.skel-sub     { height: 12px; width: 40%; }
.skel-divider { height: 1px; width: 100%; opacity: .4; margin: 4px 0; }
.skel-stats   { display: flex; gap: 12px; margin-top: 4px; }
.skel-stat    { flex: 1; height: 52px; border-radius: 12px; }

/* ── Error state ───────────────────────────────────────────────── */
.error-state {
  grid-column: 1 / -1;
  background: var(--color-surface);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}
.error-state .material-symbols-rounded {
  font-size: 48px;
  /* color: var(--color-error); --> commentato perché influiva anche l'icona nel pulsante che diventava poco visibile */
  opacity: .7;
}
.error-state h2 { font-size: 16px; font-weight: 500; }
.error-state p  { font-size: 13px; color: var(--color-on-surface-muted); max-width: 340px; }

.btn-filled {
  margin-top: 8px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: var(--color-primary);
  color: var(--color-on-primary);
  border: none;
  border-radius: var(--radius-chip);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .03em;
  cursor: pointer;
  transition: background .2s, box-shadow .2s;
  box-shadow: 0 2px 6px rgba(21,101,192,.3);
}
.btn-filled:hover {
  background: var(--color-primary-dark);
  box-shadow: 0 4px 12px rgba(21,101,192,.35);
}
.btn-filled .material-symbols-rounded { font-size: 18px; }

/* ── Empty state ───────────────────────────────────────────────── */
.empty-state {
  grid-column: 1 / -1;
  background: var(--color-surface);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-align: center;
}
.empty-state .material-symbols-rounded {
  font-size: 48px;
  color: var(--color-on-surface-muted);
  opacity: .5;
}
.empty-state p { font-size: 14px; color: var(--color-on-surface-muted); }

/* ── Device control drawer ─────────────────────────────────────── */
body.drawer-open {
  overflow: hidden;
}

.drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(20, 24, 33, .28);
  backdrop-filter: blur(2px);
  display: flex;
  justify-content: flex-end;
  z-index: 50;
  opacity: 0;
  pointer-events: none;
  transition: opacity .18s ease;
}

.drawer-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.device-drawer {
  width: min(430px, 100vw);
  height: 100%;
  background: var(--color-surface);
  box-shadow: -10px 0 30px rgba(16, 21, 29, .2);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform .22s ease;
}

.drawer-overlay.open .device-drawer {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 22px 22px 18px;
  border-bottom: 1px solid rgba(0, 0, 0, .08);
}

.drawer-overline {
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--color-on-surface-muted);
  margin-bottom: 4px;
}

.drawer-title {
  font-size: 22px;
  line-height: 1.2;
  font-weight: 500;
}

.drawer-meta {
  margin-top: 4px;
  font-size: 13px;
  color: var(--color-on-surface-muted);
}

.drawer-close {
  color: var(--color-on-surface-muted);
  margin-left: 0;
}

.drawer-body {
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.md-switch-card {
  background: var(--color-surface-variant);
  border-radius: 18px;
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.md-switch-copy {
  display: flex;
  align-items: center;
  gap: 12px;
}

.md-switch-copy .material-symbols-rounded {
  font-size: 24px;
  color: var(--color-primary);
}

.switch-label {
  font-size: 15px;
  font-weight: 500;
  line-height: 1.2;
}

.switch-caption {
  margin-top: 3px;
  font-size: 12px;
  color: var(--color-on-surface-muted);
}

.md-slider-card {
  background: var(--color-surface-variant);
  border-radius: 18px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.md-slider-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.md-slider-copy {
  display: flex;
  align-items: center;
  gap: 12px;
}

.md-slider-copy .material-symbols-rounded {
  font-size: 24px;
  color: var(--color-primary);
}

.temperature-value {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 68px;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--color-primary-container);
  color: var(--color-primary-dark);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .01em;
}

.fan-speed-value {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-width: 50px;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--color-primary-container);
  color: var(--color-primary-dark);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .03em;
}

.fan-speed-value.is-auto {
  background: #DCEBFF;
}

.fan-speed-icon {
  --fan-icon-scale: 1;
  font-size: 18px;
  transform: scale(var(--fan-icon-scale));
  transform-origin: center;
  transition: transform .16s ease, color .16s ease;
  color: var(--color-primary-dark);
}

.fan-speed-value.is-auto .fan-speed-icon {
  color: #1976D2;
}

.md-slider {
  --slider-track-height: 6px;
  --slider-thumb-size: 20px;
  width: 100%;
  appearance: none;
  height: var(--slider-thumb-size);
  background: transparent;
  cursor: pointer;
}

.md-slider:focus-visible {
  outline: none;
}

.md-slider::-webkit-slider-runnable-track {
  height: var(--slider-track-height);
  border-radius: 999px;
  background: linear-gradient(90deg, #90CAF9 0%, #1565C0 100%);
}

.md-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: var(--slider-thumb-size);
  height: var(--slider-thumb-size);
  border-radius: 50%;
  margin-top: calc((var(--slider-track-height) - var(--slider-thumb-size)) / 2);
  background: #FFFFFF;
  border: 3px solid var(--color-primary);
  box-shadow: 0 2px 8px rgba(21, 101, 192, .28);
  transition: transform .12s ease;
}

.md-slider:active::-webkit-slider-thumb {
  transform: scale(1.08);
}

.md-slider::-moz-range-track {
  height: var(--slider-track-height);
  border-radius: 999px;
  background: linear-gradient(90deg, #90CAF9 0%, #1565C0 100%);
}

.md-slider::-moz-range-thumb {
  width: var(--slider-thumb-size);
  height: var(--slider-thumb-size);
  border-radius: 50%;
  background: #FFFFFF;
  border: 3px solid var(--color-primary);
  box-shadow: 0 2px 8px rgba(21, 101, 192, .28);
  transition: transform .12s ease;
}

.md-slider:active::-moz-range-thumb {
  transform: scale(1.08);
}

.md-slider:disabled {
  opacity: .6;
  cursor: not-allowed;
}

.md-switch {
  --track-width: 52px;
  --track-height: 32px;
  --thumb-size: 22px;
  position: relative;
  width: var(--track-width);
  height: var(--track-height);
  display: inline-block;
}

.md-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.md-switch .track {
  position: absolute;
  inset: 0;
  border-radius: 999px;
  border: 2px solid #7E8794;
  background: #E6EAF1;
  transition: all .2s ease;
}

.md-switch .thumb {
  position: absolute;
  top: 50%;
  left: 5px;
  width: var(--thumb-size);
  height: var(--thumb-size);
  transform: translateY(-50%);
  border-radius: 50%;
  background: #7E8794;
  transition: all .2s ease;
  box-shadow: 0 1px 2px rgba(0,0,0,.25);
}

.md-switch .thumb::after {
  content: '';
  position: absolute;
  inset: -7px;
  border-radius: 50%;
  background: rgba(21, 101, 192, .16);
  opacity: 0;
  transition: opacity .2s ease;
}

.md-switch input:checked + .track {
  background: var(--color-primary-container);
  border-color: var(--color-primary);
}

.md-switch input:checked + .track + .thumb {
  left: calc(var(--track-width) - var(--thumb-size) - 5px);
  background: var(--color-primary);
}

.md-switch input:focus-visible + .track + .thumb::after,
.md-switch:hover .thumb::after {
  opacity: 1;
}

.md-switch input:disabled + .track {
  background: #ECEFF4;
  border-color: #B0B7C3;
}

.md-switch input:disabled + .track + .thumb {
  background: #B0B7C3;
  box-shadow: none;
}

.drawer-feedback {
  min-height: 20px;
  font-size: 13px;
  color: var(--color-on-surface-muted);
}

.drawer-feedback.info {
  color: #1565C0;
}

.drawer-feedback.success {
  color: var(--color-success);
}

.drawer-feedback.error {
  color: var(--color-error);
}

@media (max-width: 768px) {
  .device-drawer {
    width: 100%;
    border-radius: 20px 20px 0 0;
    height: min(80vh, 640px);
    margin-top: auto;
    transform: translateY(100%);
  }

  .drawer-overlay {
    justify-content: stretch;
    align-items: flex-end;
  }

  .drawer-overlay.open .device-drawer {
    transform: translateY(0);
  }
}

/* ── Session login ────────────────────────────────────────────── */
.login-page {
  background:
    linear-gradient(145deg, rgba(21, 101, 192, .12), transparent 42%),
    linear-gradient(315deg, rgba(0, 121, 107, .10), transparent 38%),
    var(--color-background);
}

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px 20px;
}

.login-panel {
  width: min(100%, 420px);
  padding: 36px;
  border-radius: 8px;
  background: var(--color-surface);
  border: 1px solid rgba(195, 199, 207, .65);
  box-shadow: 0 16px 50px rgba(26, 28, 30, .14);
}

.login-brand {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  margin-bottom: 24px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-on-primary);
  box-shadow: 0 5px 16px rgba(21, 101, 192, .28);
}

.login-brand .material-symbols-rounded { font-size: 30px; }

.login-overline {
  margin-bottom: 7px;
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.login-panel h1 {
  font-size: 28px;
  line-height: 1.2;
  font-weight: 500;
}

.login-subtitle {
  margin-top: 10px;
  color: var(--color-on-surface-muted);
  font-size: 14px;
  line-height: 1.5;
}

.login-form {
  margin-top: 30px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.md-field {
  display: flex;
  flex-direction: column;
  gap: 7px;
  color: var(--color-on-surface-muted);
  font-size: 12px;
  font-weight: 500;
}

.md-field-control {
  height: 54px;
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 0 14px;
  border: 1px solid var(--color-outline);
  border-radius: 4px;
  background: var(--color-surface);
  transition: border-color .15s, box-shadow .15s;
}

.md-field-control:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary);
}

.md-field-control > .material-symbols-rounded {
  color: var(--color-on-surface-muted);
  font-size: 21px;
}

.md-field input {
  min-width: 0;
  flex: 1;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--color-on-surface);
  font: 400 16px var(--font);
}

#password::-ms-reveal,
#password::-ms-clear {
  display: none;
}

.field-icon-btn {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--color-on-surface-muted);
  cursor: pointer;
}

.field-icon-btn:hover { background: var(--color-surface-variant); }
.field-icon-btn .material-symbols-rounded { font-size: 20px; }

.login-feedback {
  min-height: 18px;
  margin-top: -5px;
  color: var(--color-error);
  font-size: 13px;
  line-height: 1.35;
}

.login-submit {
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 0;
  border-radius: 24px;
  background: var(--color-primary);
  color: var(--color-on-primary);
  font: 500 14px var(--font);
  cursor: pointer;
  box-shadow: 0 3px 10px rgba(21, 101, 192, .3);
}

.login-submit:hover { background: var(--color-primary-dark); }
.login-submit:disabled { opacity: .7; cursor: wait; }
.login-submit .material-symbols-rounded { font-size: 19px; }
.login-submit.loading .login-button-icon { animation: spin .8s linear infinite; }

.login-privacy {
  margin-top: 24px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: var(--color-on-surface-muted);
  font-size: 12px;
  line-height: 1.45;
}

.login-privacy .material-symbols-rounded {
  color: #00796B;
  font-size: 18px;
}

@media (max-width: 520px) {
  .app-bar { padding: 0 12px; gap: 8px; }
  .app-bar-title { font-size: 17px; }
  .app-bar-meta { display: none; }
  .login-shell { padding: 0; place-items: stretch; }
  .login-panel {
    width: 100%;
    min-height: 100vh;
    padding: 48px 24px 32px;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }
}