/* ==========================================================================
   Flush Controller, tablet maintenance UI.

   Same design language as the desktop companion app -- neutral surfaces, one
   blue accent, hairline borders, colour carrying state and nothing else --
   but sized for a gloved thumb on a 10" tablet rather than a mouse: 48px
   minimum tap targets, larger type, one column.
   ========================================================================== */

:root {
  --bg:            #f4f6f9;
  --bg-panel:      #ffffff;
  --bg-inset:      #f7f9fb;

  --fg:            #0f141b;
  --fg-muted:      #58616f;

  --border:        #e2e6ec;
  --border-strong: #c9d0d9;

  --accent:        #1a66d6;
  --accent-hover:  #1558bb;
  --accent-fg:     #ffffff;

  --success:       #0d7a53;
  --success-soft:  #e6f5ee;

  --danger:        #c33529;
  --danger-soft:   #fdeeec;

  --warn:          #8a5a00;
  --warn-soft:     #fdf3e0;

  --s1: 4px;
  --s2: 8px;
  --s3: 12px;
  --s4: 16px;
  --s5: 24px;
  --s6: 32px;

  --radius:    10px;
  --radius-sm: 6px;
  --radius-pill: 999px;

  --content-width: 760px;
  --tap: 48px;

  --shade-1: 0 1px 2px rgba(15, 20, 27, 0.05);
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "Segoe UI Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:            #0a0d12;
    --bg-panel:      #12161d;
    --bg-inset:      #0e1219;

    --fg:            #e6eaf1;
    --fg-muted:      #97a1b0;

    --border:        #222935;
    --border-strong: #313a49;

    --accent:        #4d8ff0;
    --accent-hover:  #6ba3f5;
    --accent-fg:     #08111f;

    --success:       #43c491;
    --success-soft:  #10261f;

    --danger:        #f07567;
    --danger-soft:   #2a1614;

    --warn:          #e0ac4a;
    --warn-soft:     #2a2113;

    --shade-1: 0 1px 2px rgba(0, 0, 0, 0.4);
  }
}

.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  background: #f7f8fb;
  transition: opacity 0.2s ease, visibility 0s linear 0.2s;
}

.loading-overlay.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition: opacity 0.2s ease;
}

.loading-overlay iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.5;
}

/* ------------------------------------------------------------------ header */

.app-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  padding: var(--s3) var(--s4);
  padding-top: max(var(--s3), env(safe-area-inset-top));
}

.app-header-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s3);
  flex-wrap: wrap;
}

.app-title {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.app-status {
  display: flex;
  align-items: center;
  gap: var(--s2);
}

.badge {
  display: inline-block;
  padding: var(--s1) var(--s3);
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-strong);
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
}

.state-connected  { color: var(--success); border-color: var(--success); background: var(--success-soft); }
.state-connecting { color: var(--warn);    border-color: var(--warn);    background: var(--warn-soft); }
.state-disconnected { color: var(--fg-muted); background: var(--bg-inset); }

.firmware-badge {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--fg-muted);
  white-space: nowrap;
}

.device-label-row {
  display: flex;
  align-items: center;
  gap: var(--s1);
}

.device-label {
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  max-width: 12rem;
  overflow: hidden;
  text-overflow: ellipsis;
}

.label-edit-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--tap);
  height: var(--tap);
  padding: 0;
  border: none;
  background: transparent;
  color: var(--fg-muted);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  border-radius: var(--radius);
}

.label-edit-btn:hover,
.label-edit-btn:focus-visible {
  color: var(--fg);
  background: var(--bg-inset);
}

/* ------------------------------------------------------------------- main */

.app-main {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--s4);
  padding-bottom: max(var(--s6), env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: var(--s4);
}

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shade-1);
  padding: var(--s4);
}

.panel-notice {
  border-color: var(--danger);
  background: var(--danger-soft);
}

.panel-title {
  margin: 0 0 var(--s2);
  font-size: 1.02rem;
  font-weight: 650;
}

.panel-help {
  margin: 0 0 var(--s3);
  color: var(--fg-muted);
  font-size: 0.92rem;
}

.hidden { display: none !important; }

/* ---------------------------------------------------------------- buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s2);
  min-height: var(--tap);
  padding: 0 var(--s5);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg-panel);
  color: var(--fg);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  /* No 300ms tap delay, and no text selection from a long press. */
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
}

.btn-lg { min-height: 52px; font-size: 1.02rem; }

.btn:disabled { opacity: 0.55; cursor: default; }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-fg);
}
.btn-primary:not(:disabled):active { background: var(--accent-hover); }

.btn-secondary:not(:disabled):active { background: var(--bg-inset); }

.btn-danger {
  color: var(--danger);
  border-color: var(--danger);
  background: transparent;
}
.btn-danger:not(:disabled):active { background: var(--danger-soft); }

.connect-row,
.form-actions,
.log-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s3);
}

.form-actions { margin-top: var(--s4); }
.log-actions { margin-bottom: var(--s3); }

/* On a phone-width screen the buttons stack full width rather than shrinking
   below a comfortable tap target. */
@media (max-width: 480px) {
  .connect-row .btn,
  .form-actions .btn,
  .log-actions .btn { flex: 1 1 100%; }
}

/* ----------------------------------------------------------------- fields */

.field-group {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--s3) var(--s4) var(--s4);
  margin: 0 0 var(--s4);
  background: var(--bg-inset);
}

.field-group legend {
  padding: 0 var(--s2);
  font-weight: 650;
  font-size: 0.95rem;
}

.channel-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--s2);
  min-height: var(--tap);
  cursor: pointer;
}

.channel-toggle input[type="checkbox"] {
  width: 26px;
  height: 26px;
  accent-color: var(--accent);
}

.field-row {
  display: flex;
  gap: var(--s3);
}

.field {
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  gap: var(--s1);
  min-width: 0;
}

.field label {
  font-size: 0.85rem;
  color: var(--fg-muted);
  font-weight: 600;
}

.field input {
  width: 100%;
  min-height: var(--tap);
  padding: 0 var(--s3);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-panel);
  color: var(--fg);
  font: inherit;
  font-size: 1.05rem;
  font-variant-numeric: tabular-nums;
}

.field input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.field-error {
  display: block;
  margin-top: var(--s2);
  color: var(--danger);
  font-size: 0.88rem;
  font-weight: 600;
}
.field-error:empty { display: none; }

/* --------------------------------------------------------------- messages */

.message {
  margin: var(--s3) 0 0;
  font-size: 0.92rem;
  color: var(--fg-muted);
}
.message:empty { display: none; }
.message.success { color: var(--success); font-weight: 600; }
.message.error   { color: var(--danger);  font-weight: 600; }

/* ----------------------------------------------------------- diagnostic */

.diagnostic {
  margin-top: var(--s4);
  padding-top: var(--s3);
  border-top: 1px solid var(--border);
}

.diagnostic summary {
  min-height: var(--tap);
  display: flex;
  align-items: center;
  cursor: pointer;
  color: var(--fg-muted);
  font-weight: 650;
}

.diagnostic-output {
  margin: var(--s3) 0 0;
  padding: var(--s3);
  overflow-wrap: anywhere;
  white-space: pre-wrap;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--fg);
  font: 0.82rem/1.5 var(--mono);
}

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

.log-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.log-list:empty { display: none; }

.log-list li {
  display: flex;
  align-items: baseline;
  gap: var(--s3);
  padding: var(--s3) var(--s4);
  border-bottom: 1px solid var(--border);
  border-left: 3px solid transparent;
  background: var(--bg-panel);
}

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

.log-list li.log-flush { border-left-color: var(--success); }
.log-list li.log-error { border-left-color: var(--danger); background: var(--danger-soft); }

.log-time {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--fg-muted);
  white-space: nowrap;
}

.log-type {
  flex: 1 1 auto;
  font-weight: 600;
  font-size: 0.95rem;
  min-width: 0;
}

.log-detail {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--fg-muted);
}

.log-empty {
  margin: 0;
  padding: var(--s4);
  text-align: center;
  color: var(--fg-muted);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
}

/* Timestamps are the widest fixed thing in a log row; on a narrow screen the
   row stacks instead of squeezing the type name to nothing. */
@media (max-width: 480px) {
  .log-list li { flex-wrap: wrap; }
  .log-time { flex: 1 1 100%; }
}