/* ==========================================================================
   Energy Monitor dashboard
   Mobile-first: base styles target phones; media queries add columns as the
   viewport grows. Colours are role tokens so light/dark swap in one place.
   ========================================================================== */

:root {
  color-scheme: light;
  --page:        #f9f9f7;
  --surface:     #fcfcfb;
  --surface-2:   #f2f1ed;
  --text-1:      #0b0b0b;
  --text-2:      #52514e;
  --muted:       #898781;
  --grid:        #e1e0d9;
  --axis:        #c3c2b7;
  --border:      rgba(11, 11, 11, 0.10);
  --accent:      #2a78d6;
  --accent-ink:  #ffffff;

  /* Series — one colour per quantity, used everywhere that quantity appears.
     Every set that shares a chart (v/i/p, I_rms/I_peak, P/S) is validated for CVD separation. */
  --s-voltage:      #2a78d6;
  --s-current:      #eb6834;
  --s-current-peak: #6250d6;
  --s-power:        #1baf7a;
  --s-apparent:     #eda100;
  --s-pf:           #008300;
  --s-frequency:    #e87ba4;
  --s-energy:       #1baf7a;

  /* Status — reserved for state, always paired with a label. */
  --good:     #0ca30c;
  --warning:  #fab219;
  --critical: #d03b3b;

  --radius: 12px;
  --gap: 12px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", "SF Mono", Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --page:      #0d0d0d;
    --surface:   #1a1a19;
    --surface-2: #232321;
    --text-1:    #f0efec;
    --text-2:    #c3c2b7;
    --muted:     #898781;
    --grid:      #2c2c2a;
    --axis:      #383835;
    --border:    rgba(255, 255, 255, 0.10);
    --accent:    #3987e5;
    --s-voltage:      #3987e5;
    --s-current:      #d95926;
    --s-current-peak: #9085e9;
    --s-power:        #199e70;
    --s-apparent:     #c98500;
    --s-pf:           #008300;
    --s-frequency:    #d55181;
    --s-energy:       #199e70;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --page:      #0d0d0d;
  --surface:   #1a1a19;
  --surface-2: #232321;
  --text-1:    #f0efec;
  --text-2:    #c3c2b7;
  --muted:     #898781;
  --grid:      #2c2c2a;
  --axis:      #383835;
  --border:    rgba(255, 255, 255, 0.10);
  --accent:    #3987e5;
  --s-voltage:      #3987e5;
  --s-current:      #d95926;
  --s-current-peak: #9085e9;
  --s-power:        #199e70;
  --s-apparent:     #c98500;
  --s-pf:           #008300;
  --s-frequency:    #d55181;
  --s-energy:       #199e70;
}

/* --- Base ---------------------------------------------------------------- */

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--page);
  color: var(--text-1);
  font: 15px/1.45 var(--font);
  min-height: 100vh;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

h1, h2 { margin: 0; font-weight: 600; letter-spacing: -0.01em; }
h1 { font-size: 1.15rem; }
h2 { font-size: 1rem; }
a { color: var(--accent); }
code { font-family: var(--mono); font-size: 0.9em; }
.muted { color: var(--muted); font-weight: 400; }
[hidden] { display: none !important; }

svg { fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* --- Header -------------------------------------------------------------- */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap);
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand-mark { width: 32px; height: 32px; flex: none; }
.brand-mark rect { fill: var(--accent); stroke: none; }
.brand-mark path { fill: #fff; stroke: none; }
.subtitle { margin: 0; font-size: 0.78rem; color: var(--text-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.header-actions { display: flex; align-items: center; gap: 6px; flex: none; }

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
}
.icon-btn svg { width: 20px; height: 20px; }
.icon-btn:hover { background: var(--surface-2); color: var(--text-1); }

/* Status: colour + text label, never colour alone. */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 32px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  font-size: 0.82rem;
  font-weight: 600;
  white-space: nowrap;
}
.status-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--muted); }
.status-pill[data-state="connected"]  .status-dot { background: var(--good); box-shadow: 0 0 0 3px color-mix(in srgb, var(--good) 25%, transparent); }
.status-pill[data-state="connecting"] .status-dot { background: var(--warning); animation: pulse 1s ease-in-out infinite; }
.status-pill[data-state="stale"]      .status-dot { background: var(--warning); }
.status-pill[data-state="error"]      .status-dot { background: var(--critical); }

@keyframes pulse { 50% { opacity: 0.3; } }

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

.app-main {
  display: grid;
  gap: var(--gap);
  padding: var(--gap);
  max-width: 1440px;
  margin: 0 auto;
}
/* Grid items default to min-width:auto, which would let a canvas widen the page on phones. */
.app-main > * { min-width: 0; }

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
}
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; }
.panel-note { margin: 0 0 10px; font-size: 0.82rem; color: var(--text-2); max-width: 80ch; }

/* --- Buttons & form controls --------------------------------------------- */

.btn {
  min-height: 44px;
  padding: 0 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text-1);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  touch-action: manipulation;
}
.btn:hover:not(:disabled) { filter: brightness(0.97); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-primary { background: var(--accent); border-color: transparent; color: var(--accent-ink); }
.btn-primary[data-mode="disconnect"] { background: var(--surface-2); color: var(--text-1); border-color: var(--border); }
.btn[aria-pressed="true"] { background: color-mix(in srgb, var(--warning) 22%, var(--surface-2)); }

select, input {
  min-height: 44px;
  padding: 0 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text-1);
  font: inherit;
  width: 100%;
}
input { font-family: var(--mono); font-size: 0.9rem; }
input[aria-invalid="true"] { border-color: var(--critical); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* --- Connection ---------------------------------------------------------- */

.connection { display: grid; gap: 10px; }

.source-picker {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  padding: 4px;
  border-radius: 12px;
  background: var(--surface-2);
  border: 1px solid var(--border);
}
.seg { position: relative; }
.seg input { position: absolute; opacity: 0; inset: 0; min-height: 0; cursor: pointer; }
.seg span {
  display: grid;
  place-items: center;
  min-height: 40px;
  padding: 0 6px;
  border-radius: 9px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-2);
  text-align: center;
}
.seg input:checked + span { background: var(--surface); color: var(--text-1); box-shadow: 0 1px 2px rgba(0,0,0,0.12); }
.seg input:focus-visible + span { outline: 2px solid var(--accent); }
.seg input:disabled + span { opacity: 0.5; cursor: not-allowed; }
.seg input:checked:disabled + span { opacity: 1; }
.seg input[data-unsupported] + span { text-decoration: line-through; }

.connection-message { margin: 0; font-size: 0.85rem; color: var(--text-2); overflow-wrap: anywhere; }
.connection-message[data-tone="error"] { color: var(--critical); }
.filter-note { margin: 0; font-size: 0.82rem; color: var(--text-2); }
.filter-note .link-btn { margin-left: 8px; }
.filter-note::before { content: ""; display: inline-block; vertical-align: -2px; margin-right: 6px; width: 14px; height: 14px; background: currentColor; opacity: 0.6;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M3 5h18l-7 8v6l-4 2v-8z'/%3E%3C/svg%3E") center / contain no-repeat;
          mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M3 5h18l-7 8v6l-4 2v-8z'/%3E%3C/svg%3E") center / contain no-repeat; }
.link-btn { border: 0; padding: 6px 0; background: none; color: var(--accent); font: inherit; font-weight: 600; cursor: pointer; text-decoration: underline; text-underline-offset: 2px; }
.support-note {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-2);
  padding: 8px 10px;
  border-radius: 8px;
  background: color-mix(in srgb, var(--warning) 14%, transparent);
}

/* --- Link stats ---------------------------------------------------------- */

.link-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px 12px;
  padding: 0 4px;
  font-size: 0.82rem;
}
.link-stats .k { color: var(--muted); }
.link-stats .v { font-variant-numeric: tabular-nums; font-weight: 600; color: var(--text-2); }
.stat-warning { grid-column: 1 / -1; color: var(--text-2); }
.stat-warning::before { content: "⚠ "; color: var(--warning); }

/* --- Measurement cards --------------------------------------------------- */

.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 12px 10px;
  min-width: 0;
  transition: opacity 0.3s;
}
.card.stale { opacity: 0.5; }

.card-label {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.card-key { width: 10px; height: 4px; border-radius: 2px; flex: none; }

.card-value {
  margin-top: 4px;
  font-size: 1.65rem;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.card-unit { font-size: 0.9rem; font-weight: 500; color: var(--text-2); margin-left: 3px; letter-spacing: 0; }

.card-sub {
  margin-top: 4px;
  font-size: 0.72rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-spark { display: block; width: 100%; height: 26px; margin-top: 6px; }
.card-spark polyline { stroke: var(--muted); stroke-width: 1.5; fill: none; vector-effect: non-scaling-stroke; }

/* --- Toolbar ------------------------------------------------------------- */

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.toolbar-group { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.toolbar-group:last-child { flex: 1 1 100%; }
.toolbar-group:last-child .btn { flex: 1; padding: 0 10px; }
.toolbar-label { font-size: 0.85rem; color: var(--text-2); font-weight: 600; }
.toolbar select { width: auto; min-width: 120px; }

/* --- Badges -------------------------------------------------------------- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-2);
  background: var(--surface-2);
  border: 1px solid var(--border);
  white-space: nowrap;
}
.badge svg { width: 14px; height: 14px; }
.badge-warning { background: color-mix(in srgb, var(--warning) 18%, var(--surface-2)); }

/* --- Charts -------------------------------------------------------------- */

.wave-grid, .trend-grid { display: grid; gap: var(--gap); }

.chart-card { margin: 0; min-width: 0; }
.chart-card figcaption { font-size: 0.85rem; font-weight: 600; margin-bottom: 4px; color: var(--text-1); }
.chart { width: 100%; min-width: 0; position: relative; }

.chart-empty {
  position: absolute;
  inset: 0 0 40px 0;
  display: grid;
  place-items: center;
  font-size: 0.82rem;
  color: var(--muted);
  pointer-events: none;
}

.chart-primary { margin-bottom: 14px; }
.chart-primary figcaption { font-size: 0.95rem; }

.wave-facts {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 6px 14px;
  margin: 0 0 14px;
  font-size: 0.8rem;
}
.wave-facts div { display: flex; justify-content: space-between; gap: 8px; border-bottom: 1px solid var(--grid); padding-bottom: 3px; }
.wave-facts dt { color: var(--muted); }
.wave-facts dd { margin: 0; font-weight: 600; color: var(--text-2); font-variant-numeric: tabular-nums; }

/* uPlot overrides — recessive chrome, legend doubles as the hover readout. */
.uplot { font-family: var(--font); }
.u-legend { font-size: 0.75rem; color: var(--text-2); text-align: left; margin-top: 2px; }
.u-legend .u-series { padding: 2px 6px; }
.u-legend .u-series th { font-weight: 500; }
.u-legend .u-series td { font-variant-numeric: tabular-nums; font-weight: 600; color: var(--text-1); }
.u-legend .u-marker { width: 12px; height: 3px; border-radius: 2px; margin-right: 5px; vertical-align: middle; }
.u-select { background: color-mix(in srgb, var(--accent) 12%, transparent); }

/* --- Raw log ------------------------------------------------------------- */

.raw-log summary { display: flex; align-items: baseline; gap: 10px; cursor: pointer; list-style: none; min-height: 28px; }
.raw-log summary::-webkit-details-marker { display: none; }
.raw-log summary::before { content: "▸"; color: var(--muted); }
.raw-log[open] summary::before { content: "▾"; }
.raw-log summary .muted { font-size: 0.8rem; }

.raw-lines {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  max-height: 320px;
  overflow: auto;
  font: 0.76rem/1.6 var(--mono);
  background: var(--surface-2);
  border-radius: 8px;
  padding: 8px;
}
.raw-lines li { display: grid; grid-template-columns: auto auto 1fr; gap: 8px; align-items: baseline; }
.raw-lines .ts { color: var(--muted); }
.raw-lines .tag { font-weight: 700; }
.raw-lines .ok .tag { color: var(--good); }
.raw-lines .warn .tag { color: var(--warning); }
.raw-lines .bad .tag { color: var(--critical); }
.raw-lines .line { overflow-wrap: anywhere; color: var(--text-2); }
.raw-lines .reason { display: block; color: var(--critical); }
.raw-lines .warn .reason { color: var(--text-2); }

/* --- Footer -------------------------------------------------------------- */

.app-footer { max-width: 1440px; margin: 0 auto; padding: 4px 16px 24px; font-size: 0.78rem; color: var(--muted); }

/* --- Settings dialog ----------------------------------------------------- */

.dialog {
  width: min(520px, calc(100vw - 24px));
  max-height: calc(100dvh - 24px);
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  color: var(--text-1);
}
.dialog::backdrop { background: rgba(0, 0, 0, 0.45); }
.dialog form { display: grid; gap: 14px; padding: 18px; }
.dialog fieldset { border: 1px solid var(--border); border-radius: 10px; margin: 0; padding: 10px 12px 12px; display: grid; gap: 10px; }
.dialog legend { font-size: 0.82rem; font-weight: 600; color: var(--text-2); padding: 0 4px; }
.dialog label { display: grid; gap: 4px; font-size: 0.85rem; font-weight: 600; }
.dialog label.check { display: flex; align-items: center; gap: 10px; font-weight: 500; min-height: 32px; cursor: pointer; }
.dialog input[type="checkbox"] { width: 20px; height: 20px; min-height: 0; padding: 0; flex: none; accent-color: var(--accent); }
.hint { margin: 0; font-size: 0.78rem; color: var(--text-2); }
.form-error { margin: 0; min-height: 1em; font-size: 0.82rem; color: var(--critical); }
.dialog-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.dialog-actions .spacer { flex: 1; }

/* --- Breakpoints --------------------------------------------------------- */

/* Large phones / small tablets */
@media (min-width: 560px) {
  .link-stats { grid-template-columns: repeat(4, auto) 1fr; justify-content: start; }
  .stat-warning { grid-column: auto; }
  .toolbar-group:last-child { flex: 0 1 auto; }
  .toolbar-group:last-child .btn { flex: none; padding: 0 16px; }
}

/* Tablets */
@media (min-width: 760px) {
  .app-header { padding: 12px 20px; }
  .app-main { padding: 16px 20px; gap: 16px; }
  .connection { grid-template-columns: minmax(320px, 420px) auto 1fr; align-items: center; }
  .connection .btn-primary { min-width: 140px; }
  .support-note, .filter-note { grid-column: 1 / -1; }
  .cards { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
  .card { padding: 14px 16px 12px; }
  .card-value { font-size: 2rem; }
  .wave-facts { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .wave-facts div { flex-direction: column; gap: 0; }
}

/* Desktop */
@media (min-width: 1000px) {
  .wave-grid, .trend-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .trend-grid > :first-child { grid-column: 1 / -1; }
}

/* Phones */
@media (max-width: 559px) {
  .app-header { padding: 10px 12px; }
  .brand-mark, .subtitle { display: none; }
  .brand h1 { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .brand, .brand > div { min-width: 0; }
  /* The time row of each legend only matters on hover, which is rare on touch screens. */
  .u-legend .u-series:first-child { display: none; }
}

/* Very narrow phones */
@media (max-width: 370px) {
  .status-pill { padding: 0 9px; }
  .icon-btn { width: 36px; height: 36px; }
  .card-value { font-size: 1.4rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}