/* ============================================================
   viewfinder.css — Viewfinder Screen Styles
   LapTrack · Phase 2 (Task Group D)
   Import after global.css in index.html.
   ============================================================ */

/* ----------------------------------------------------------
   D1 — Full-Screen Viewfinder Container
   ---------------------------------------------------------- */

/* When active, the viewfinder section covers the full viewport
   behind all other content (z-index: 10). The `hidden` attribute
   hides it; JS removes `hidden` to show the screen. */
#screen-viewfinder {
  position: fixed;
  inset: 0;
  z-index: 10;
  background-color: var(--color-bg);
  overflow: hidden;
}

/* Live camera feed */
#viewfinder-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ----------------------------------------------------------
   D2 — Status Indicator HUD Bar
   Pill-shaped bar centred at the top of the viewfinder.
   Contains two status chips: Wake Lock and Camera Lock.
   ---------------------------------------------------------- */
.viewfinder-hud {
  position: absolute;
  top: 12px;
  left: max(8px, env(safe-area-inset-left, 8px));
  right: max(8px, env(safe-area-inset-right, 8px));
  transform: none;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2);
  background-color: rgba(17, 17, 17, 0.85);
  border-radius: var(--radius-full);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  white-space: nowrap;
  overflow: hidden;
}

/* Individual status chips inside the HUD bar */
.viewfinder-status-chip {
  display: inline-flex;
  align-items: center;
  flex: 1 1 0;
  min-width: 0;
  gap: var(--space-1);
  border-radius: 20px;
  padding: 4px 8px;
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  /* Default / inactive state */
  color: var(--color-text-muted);
}

/* Active state — set by JS when lock is acquired */
.viewfinder-status-chip[data-state="active"] {
  color: var(--color-start);
}

/* ----------------------------------------------------------
   D2b — Motion detection status chip
   Hidden until the trigger line is drawn (data-state="idle").
   Amber while detection is running, green flash on each trigger.
   ---------------------------------------------------------- */
.viewfinder-motion-chip {
  display: inline-flex;
  font-variant-numeric: tabular-nums;
  color: var(--color-text-muted);
  transition: color 80ms ease, font-size 80ms ease;
}

.viewfinder-motion-chip[data-state="idle"] {
  color: var(--color-text-muted);
}

.viewfinder-motion-chip[data-state="active"] {
  color: #F59E0B;
}

.viewfinder-motion-chip[data-state="triggered"] {
  color: var(--color-best-lap);
  transition: color 0ms;
}

/* ── Detection flash overlay ─────────────────────────────────────────────── */
.detection-flash {
  position: absolute;
  inset: 0;
  z-index: 50;
  background: var(--color-best-lap);
  opacity: 0;
  pointer-events: none;
  transition: opacity 80ms ease-in;
}

.detection-flash.is-active {
  opacity: 0.35;
  transition: opacity 0ms; /* instant on */
}

/* ----------------------------------------------------------
   D3 — Confirm Button
   Full-width, anchored to the bottom of the viewfinder.
   Respects iOS safe-area inset so it clears the home bar.
   Disabled until the camera stream is active (E2 enables it).
   ---------------------------------------------------------- */
#viewfinder-confirm {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100%;
  min-height: 64px;
  /* Stack the padding so safe-area adds on top of base padding */
  padding: var(--space-4) var(--space-4)
    calc(var(--space-4) + env(safe-area-inset-bottom, 0px));
  background-color: var(--color-accent);
  color: #000000;
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  border: none;
  border-radius: 0;
  cursor: pointer;
  z-index: 20;
  -webkit-tap-highlight-color: transparent;
}

#viewfinder-confirm:active {
  background-color: var(--color-accent-dim);
}

/* Disabled until camera stream is active (set by app.js / E2) */
#viewfinder-confirm:disabled {
  opacity: 0.4;
  pointer-events: none;
}

/* ----------------------------------------------------------
   D4 — Error Banner
   Rendered above the Confirm button; hidden by default.
   JS camera error handlers (A3) set display:block and inject
   the error message text. role="alert" is on the element in HTML.
   ---------------------------------------------------------- */
#viewfinder-error {
  position: absolute;
  bottom: 80px;
  left: 0;
  right: 0;
  z-index: 20;
  padding: var(--space-3) var(--space-4);
  background-color: rgba(239, 68, 68, 0.20);
  border-left: 4px solid var(--color-stop);
  color: var(--color-text-primary);
  font-family: var(--font-ui);
  font-size: 0.875rem;
  line-height: 1.5;
  /* Hidden by default; shown by JS error handlers */
  display: none;
}

/* ----------------------------------------------------------
   E2 — Stabilizing Overlay
   Centred text shown during the 2-second camera warm-up window.
   JS adds/removes .is-hidden and .is-fading to control visibility.
   ---------------------------------------------------------- */
#viewfinder-stabilizing {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 20;
  color: var(--color-text-secondary);
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  pointer-events: none;
  opacity: 1;
  transition: opacity 0.4s ease;
}

#viewfinder-stabilizing.is-fading {
  opacity: 0;
}

#viewfinder-stabilizing.is-hidden {
  display: none;
}

/* ============================================================
   Phase 3 — Task Group C: Trigger Zone Drawing Layer & Calibration
   All rules below are additive; no Phase 2 rules are modified.
   ============================================================ */

/* ----------------------------------------------------------
   C1 — Canvas overlay for trigger zone drawing
   Above <video> (no explicit z-index), below HUD bar (z-index: 20)
   ---------------------------------------------------------- */
#viewfinder-canvas {
  position: absolute;
  inset: 0;
  z-index: 15;
  width: 100%;
  height: 100%;
  touch-action: none;     /* Belt-and-suspenders with JS event.preventDefault() */
  cursor: crosshair;
}

/* ----------------------------------------------------------
   C2 — Calibration tools panel
   Anchored directly above #viewfinder-confirm (min-height: 64px)
   ---------------------------------------------------------- */
.calibration-panel {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 64px;                    /* Sits flush above #viewfinder-confirm */
  z-index: 20;
  padding: var(--space-4);
  background-color: rgba(17, 17, 17, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--color-border);
}

.calibration-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}

.calibration-panel-title {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
}

#btn-calibration-panel-toggle {
  min-width: 32px;
  min-height: 32px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-text-secondary);
  font-family: var(--font-ui);
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
}

#btn-calibration-panel-toggle:active {
  opacity: 0.85;
  transform: scale(0.97);
}

#btn-calibration-panel-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

#btn-calibration-panel-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.calibration-panel.is-collapsed {
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
}

.calibration-panel.is-collapsed .calibration-row {
  display: none;
}

.calibration-panel.is-collapsed .calibration-panel-header {
  margin-bottom: 0;
}

/* ----------------------------------------------------------
   C3 — Calibration row: label + slider + range indicators
   ---------------------------------------------------------- */
.calibration-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-bottom: var(--space-3);
}

.calibration-row:last-child {
  margin-bottom: 0;
}

.calibration-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
}

.calibration-value {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
  text-transform: none;
  letter-spacing: 0;
}

.calibration-range-labels {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* ----------------------------------------------------------
   C4 — Custom range slider (shared by all three calibration sliders)
   --slider-fill is set by JS on every input event; fallback 74%
   matches the 75% sensitivity default.
   ---------------------------------------------------------- */
.calibration-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: var(--radius-sm);
  outline: none;
  cursor: pointer;
  background: linear-gradient(
    to right,
    var(--color-accent) 0%,
    var(--color-accent) var(--slider-fill, 74%),
    var(--color-border) var(--slider-fill, 74%),
    var(--color-border) 100%
  );
}

/* Thumb — WebKit / Blink (Chrome, Safari, Edge) */
.calibration-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: var(--radius-circle);
  background: var(--color-accent);
  cursor: pointer;
}

/* Thumb — Firefox */
.calibration-slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border: none;
  border-radius: var(--radius-circle);
  background: var(--color-accent);
  cursor: pointer;
}

/* ----------------------------------------------------------
   C6 — Clear drawn line button (shown by JS via .is-visible)
   Positioned below HUD bar (~56px from top)
   ---------------------------------------------------------- */
#btn-clear-line {
  position: absolute;
  top: calc(var(--space-12) + var(--space-2));
  right: var(--space-4);
  z-index: 21;
  min-width: 48px;
  min-height: 48px;
  padding: var(--space-2) var(--space-3);
  background: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  cursor: pointer;
  display: none;          /* Hidden by default; toggled by .is-visible */
}

#btn-clear-line.is-visible {
  display: flex;
  align-items: center;
  justify-content: center;
}

#btn-clear-line:active {
  opacity: 0.85;
  transform: scale(0.97);
}

/* ----------------------------------------------------------
   Phase 5 — Calibration toggle switch and number input
   ---------------------------------------------------------- */

/* Pill track */
.calibration-toggle {
  position: relative;
  width: 44px;
  height: 24px;
  min-width: 44px;
  min-height: 24px;
  border-radius: var(--radius-full);
  background-color: var(--color-border);
  border: none;
  padding: 0;
  cursor: pointer;
  transition: background-color 0.2s ease;
  flex-shrink: 0;
}

.calibration-toggle[data-active="true"] {
  background-color: var(--color-accent);
}

/* Sliding thumb */
.calibration-toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: var(--radius-circle);
  background-color: #ffffff;
  transition: transform 0.2s ease;
  pointer-events: none;
}

.calibration-toggle[data-active="true"] .calibration-toggle-thumb {
  transform: translateX(20px);
}

/* Toggle row — horizontal layout */
.calibration-row--toggle {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
}

/* Goal Laps number field */
.calibration-number-input {
  width: 72px;
  height: 36px;
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.calibration-number-input:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}

/* ----------------------------------------------------------
   Phase 7.5 — Viewfinder Help Popup
   ---------------------------------------------------------- */

.viewfinder-help-btn {
  background: rgba(255, 255, 255, 0.15);
  border: none;
  color: var(--color-text-primary);
  font-size: 0.875rem;
  font-weight: 700;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  flex-shrink: 0;
}

.viewfinder-help-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
}

.viewfinder-help-modal[hidden] {
  display: none;
}

.viewfinder-help-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  width: 100%;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.viewfinder-help-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin: 0;
}

.viewfinder-help-steps {
  margin: 0;
  padding-left: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  counter-reset: step-counter;
}

.viewfinder-help-steps li {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  font-size: 0.9375rem;
  color: var(--color-text-primary);
  line-height: 1.5;
  counter-increment: step-counter;
}

.viewfinder-help-steps li::before {
  content: counter(step-counter);
  min-width: 24px;
  height: 24px;
  background: var(--color-accent);
  color: #000;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}