/* =========================================================================
   SmartNap - Material 3 dark theme
   Tokens follow the M3 baseline dark scheme (primary key colour #6750A4).
   ========================================================================= */

:root {
  --md-primary: #b69df8;
  --md-on-primary: #381e72;
  --md-primary-container: #4f378b;
  --md-on-primary-container: #eaddff;

  --md-secondary: #ccc2dc;
  --md-secondary-container: #4a4458;
  --md-on-secondary-container: #e8def8;

  --md-tertiary: #efb8c8;
  --md-tertiary-container: #633b48;
  --md-on-tertiary-container: #ffd8e4;

  --md-error: #f2b8b5;
  --md-error-container: #8c1d18;

  --md-surface: #141218;
  --md-surface-container-lowest: #0f0d13;
  --md-surface-container: #211f26;
  --md-surface-container-high: #2b2930;
  --md-surface-container-highest: #36343b;
  --md-on-surface: #e6e0e9;
  --md-on-surface-variant: #cac4d0;

  --md-outline: #938f99;
  --md-outline-variant: #49454f;

  --md-success: #7fd8a4;

  --shape-xs: 8px;
  --shape-sm: 12px;
  --shape-md: 16px;
  --shape-lg: 20px;
  --shape-xl: 28px;
  --shape-full: 999px;

  --ease-emphasized: cubic-bezier(0.2, 0, 0, 1);
  --ease-standard: cubic-bezier(0.2, 0, 0, 1);

  --font: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  background: var(--md-surface);
  color: var(--md-on-surface);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.45;
  overscroll-behavior-y: none;
  -webkit-font-smoothing: antialiased;
}

button,
input,
select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

:focus-visible {
  outline: 3px solid var(--md-primary);
  outline-offset: 2px;
}

/* ---------------------------------------------------------------- Layout */

.app {
  max-width: 520px;
  margin: 0 auto;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  padding: 0 16px calc(96px + env(safe-area-inset-bottom));
  padding-top: calc(12px + env(safe-area-inset-top));
}

.topbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0 16px;
}

.topbar h1 {
  font-size: 22px;
  font-weight: 500;
  letter-spacing: 0;
  margin: 0;
  flex: 1;
}

.topbar .brandmark {
  width: 32px;
  height: 32px;
  border-radius: var(--shape-sm);
  background: var(--md-primary-container);
  display: grid;
  place-items: center;
  font-size: 17px;
}

.screen {
  display: none;
  flex-direction: column;
  gap: 12px;
  animation: fade-in 220ms var(--ease-standard);
}

.screen.active {
  display: flex;
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ----------------------------------------------------------------- Cards */

.card {
  background: var(--md-surface-container);
  border-radius: var(--shape-lg);
  padding: 16px;
}

.card.tonal {
  background: var(--md-surface-container-high);
}

.card h2 {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 500;
}

.card .caption {
  margin: 0;
  font-size: 13px;
  color: var(--md-on-surface-variant);
}

.section-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--md-on-surface-variant);
  margin: 12px 4px 2px;
}

/* --------------------------------------------------------- Status strip */

.status-strip {
  display: flex;
  gap: 8px;
}

.chip {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: var(--shape-xs);
  background: var(--md-surface-container);
  border: 1px solid var(--md-outline-variant);
  font-size: 12.5px;
  color: var(--md-on-surface-variant);
}

.chip .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--md-outline);
  flex: none;
}

.chip.ok .dot {
  background: var(--md-success);
}
.chip.warn .dot {
  background: var(--md-tertiary);
}
.chip.bad .dot {
  background: var(--md-error);
}

.chip span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* -------------------------------------------------------------- The dial */

.dial-card {
  background: var(--md-surface-container);
  border-radius: var(--shape-xl);
  padding: 24px 16px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.dial {
  position: relative;
  width: min(268px, 74vw);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
}

.dial svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.dial .track {
  fill: none;
  stroke: var(--md-surface-container-highest);
  stroke-width: 10;
}

.dial .progress {
  fill: none;
  stroke: var(--md-primary);
  stroke-width: 10;
  stroke-linecap: round;
  transition: stroke-dashoffset 480ms var(--ease-emphasized), stroke 400ms linear;
}

/* The breathing halo: period stretches as stillness accumulates. */
.dial .halo {
  position: absolute;
  width: 78%;
  height: 78%;
  border-radius: 50%;
  background: radial-gradient(circle, var(--md-primary) 0%, transparent 68%);
  opacity: 0.1;
  animation: breathe var(--breath, 5s) ease-in-out infinite;
}

@keyframes breathe {
  0%,
  100% {
    transform: scale(0.82);
    opacity: 0.07;
  }
  50% {
    transform: scale(1);
    opacity: 0.2;
  }
}

.dial-inner {
  position: relative;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.dial-primary {
  font-size: 54px;
  font-weight: 300;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.dial-primary.small {
  font-size: 40px;
}

.dial-unit {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--md-on-surface-variant);
}

.dial-state {
  margin-top: 10px;
  font-size: 14px;
  font-weight: 500;
  color: var(--md-primary);
  text-align: center;
  min-height: 20px;
}

.dial-hint {
  font-size: 13px;
  color: var(--md-on-surface-variant);
  text-align: center;
  max-width: 32ch;
  min-height: 18px;
}

/* --------------------------------------------------------------- Metrics */

.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  width: 100%;
  margin-top: 16px;
}

.metric {
  background: var(--md-surface-container-high);
  border-radius: var(--shape-sm);
  padding: 10px 8px;
  text-align: center;
}

.metric .value {
  font-size: 20px;
  font-weight: 400;
  font-variant-numeric: tabular-nums;
}

.metric .label {
  font-size: 11px;
  color: var(--md-on-surface-variant);
  letter-spacing: 0.04em;
}

/* --------------------------------------------------------------- Buttons */

.btn {
  border: none;
  border-radius: var(--shape-full);
  padding: 0 24px;
  height: 48px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: filter 140ms var(--ease-standard), background 140ms;
}

.btn:active {
  filter: brightness(1.18);
}

.btn:disabled {
  opacity: 0.38;
  cursor: default;
}

.btn.filled {
  background: var(--md-primary);
  color: var(--md-on-primary);
}

.btn.tonal {
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
}

.btn.outlined {
  background: transparent;
  color: var(--md-primary);
  border: 1px solid var(--md-outline);
}

.btn.text {
  background: transparent;
  color: var(--md-primary);
  padding: 0 12px;
}

.btn.danger {
  background: transparent;
  color: var(--md-error);
  border: 1px solid var(--md-error);
}

.btn.block {
  width: 100%;
}

.btn.large {
  height: 60px;
  font-size: 17px;
}

.icon-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--md-on-surface-variant);
  font-size: 19px;
  cursor: pointer;
  display: grid;
  place-items: center;
}

.icon-btn:active {
  background: var(--md-surface-container-high);
}

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

.actions .btn {
  flex: 1;
}

/* ----------------------------------------------------------------- Chart */

.chart-wrap {
  position: relative;
  height: 132px;
  margin-top: 8px;
}

.chart-wrap canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.legend {
  display: flex;
  gap: 14px;
  font-size: 11.5px;
  color: var(--md-on-surface-variant);
  margin-top: 8px;
}

.legend i {
  display: inline-block;
  width: 10px;
  height: 3px;
  border-radius: 2px;
  margin-right: 5px;
  vertical-align: middle;
}

/* -------------------------------------------------------------- Controls */

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 14px 0;
  border-bottom: 1px solid var(--md-outline-variant);
}

.field:last-child {
  border-bottom: none;
}

.field > label {
  font-size: 14px;
  font-weight: 500;
}

.field .help {
  font-size: 12.5px;
  color: var(--md-on-surface-variant);
  margin: 0;
}

.segmented {
  display: flex;
  border: 1px solid var(--md-outline);
  border-radius: var(--shape-full);
  overflow: hidden;
}

.segmented button {
  flex: 1;
  background: transparent;
  border: none;
  border-right: 1px solid var(--md-outline);
  padding: 10px 4px;
  font-size: 13.5px;
  cursor: pointer;
  color: var(--md-on-surface);
  transition: background 140ms;
}

.segmented button:last-child {
  border-right: none;
}

.segmented button[aria-pressed='true'] {
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  font-weight: 500;
}

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

.switch {
  position: relative;
  width: 52px;
  height: 32px;
  flex: none;
  border-radius: var(--shape-full);
  border: 2px solid var(--md-outline);
  background: var(--md-surface-container-highest);
  cursor: pointer;
  transition: background 160ms, border-color 160ms;
}

.switch::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 5px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--md-outline);
  transform: translateY(-50%);
  transition: transform 160ms var(--ease-emphasized), width 160ms, height 160ms, background 160ms,
    left 160ms;
}

.switch[aria-checked='true'] {
  background: var(--md-primary);
  border-color: var(--md-primary);
}

.switch[aria-checked='true']::after {
  width: 24px;
  height: 24px;
  left: 3px;
  transform: translate(18px, -50%);
  background: var(--md-on-primary);
}

input[type='range'] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: var(--md-surface-container-highest);
}

input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--md-primary);
}

input[type='range']::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border: none;
  border-radius: 50%;
  background: var(--md-primary);
}

/* --------------------------------------------------------------- History */

.history-item {
  width: 100%;
  text-align: left;
  background: var(--md-surface-container);
  border: none;
  border-radius: var(--shape-md);
  padding: 14px 16px;
  margin-bottom: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
}

.history-item .when {
  flex: 1;
  min-width: 0;
}

.history-item .when strong {
  display: block;
  font-size: 14.5px;
  font-weight: 500;
}

.history-item .when small {
  color: var(--md-on-surface-variant);
  font-size: 12.5px;
}

.history-item .badge {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: var(--shape-full);
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  white-space: nowrap;
}

.history-item .badge.est {
  background: var(--md-surface-container-highest);
  color: var(--md-on-surface-variant);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.empty {
  text-align: center;
  padding: 40px 20px;
  color: var(--md-on-surface-variant);
}

.empty .big {
  font-size: 34px;
  margin-bottom: 8px;
}

/* ----------------------------------------------------------------- Sheet */

.sheet-scrim {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms var(--ease-standard);
  z-index: 40;
}

.sheet-scrim.open {
  opacity: 1;
  pointer-events: auto;
}

.sheet {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  max-height: 82vh;
  overflow-y: auto;
  background: var(--md-surface-container-high);
  border-radius: var(--shape-xl) var(--shape-xl) 0 0;
  padding: 12px 20px calc(28px + env(safe-area-inset-bottom));
  transform: translateY(101%);
  transition: transform 280ms var(--ease-emphasized);
  z-index: 41;
  max-width: 520px;
  margin: 0 auto;
}

.sheet.open {
  transform: none;
}

.sheet .grabber {
  width: 32px;
  height: 4px;
  border-radius: 2px;
  background: var(--md-outline-variant);
  margin: 0 auto 14px;
}

.sheet h3 {
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 500;
}

/* ------------------------------------------------------- Alarm & dimming */

.alarm-overlay {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  background: var(--md-surface);
  padding: 32px;
  text-align: center;
}

.alarm-overlay.open {
  display: flex;
}

.alarm-overlay.flash {
  animation: flash 900ms ease-in-out infinite;
}

@keyframes flash {
  0%,
  100% {
    background: var(--md-surface);
  }
  50% {
    background: var(--md-primary-container);
  }
}

.alarm-overlay .glyph {
  font-size: 68px;
}

.alarm-overlay h2 {
  margin: 0;
  font-size: 30px;
  font-weight: 400;
}

.alarm-overlay p {
  margin: 0;
  color: var(--md-on-surface-variant);
  max-width: 30ch;
}

/* Night dimming: the screen must stay on, but it should not light the room. */
.dimmer {
  position: fixed;
  inset: 0;
  background: #000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 1200ms linear;
  z-index: 30;
}

.dimmer.on {
  opacity: 0.94;
  pointer-events: auto;
}

.dimmer .peek {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: #6b6570;
  font-size: 15px;
  font-variant-numeric: tabular-nums;
}

/* ----------------------------------------------------------------- Toast */

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(24px + env(safe-area-inset-bottom));
  transform: translate(-50%, 140%);
  background: var(--md-surface-container-highest);
  color: var(--md-on-surface);
  padding: 13px 18px;
  border-radius: var(--shape-xs);
  font-size: 13.5px;
  max-width: min(440px, calc(100vw - 32px));
  z-index: 70;
  transition: transform 260ms var(--ease-emphasized);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
}

.toast.show {
  transform: translate(-50%, 0);
}

/* -------------------------------------------------------------- Nav bar */

.navbar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  justify-content: space-around;
  background: var(--md-surface-container);
  padding: 8px 0 calc(10px + env(safe-area-inset-bottom));
  z-index: 20;
  max-width: 520px;
  margin: 0 auto;
  border-top: 1px solid var(--md-outline-variant);
}

.navbar button {
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 4px 18px;
  color: var(--md-on-surface-variant);
  font-size: 11.5px;
  border-radius: var(--shape-full);
}

.navbar button .ico {
  font-size: 19px;
  line-height: 1;
  padding: 3px 16px;
  border-radius: var(--shape-full);
  transition: background 160ms;
}

.navbar button[aria-current='page'] {
  color: var(--md-on-surface);
  font-weight: 500;
}

.navbar button[aria-current='page'] .ico {
  background: var(--md-secondary-container);
}

.navbar.hidden {
  display: none;
}

.notice {
  background: var(--md-tertiary-container);
  color: var(--md-on-tertiary-container);
  border-radius: var(--shape-md);
  padding: 12px 14px;
  font-size: 13px;
  line-height: 1.45;
}

.notice.error {
  background: var(--md-error-container);
  color: #ffdad6;
}

.notice a {
  color: inherit;
}

/* ------------------------------------------------------------ Sound grid */

.sound-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.sound-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  border-radius: var(--shape-sm);
  border: 1px solid var(--md-outline-variant);
  background: var(--md-surface-container-high);
  color: var(--md-on-surface);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: background 140ms, border-color 140ms;
}

.sound-chip[aria-pressed='true'] {
  border-color: var(--md-primary);
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
}

.sound-chip .wave {
  font-size: 16px;
  flex: none;
}

.sound-group-label {
  grid-column: 1 / -1;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--md-on-surface-variant);
  margin: 6px 2px 0;
}

.sound-group-label:first-child {
  margin-top: 0;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}