/* VR Photo Viewer: clean, minimal, dark, mobile-first. */

:root {
  --bg: #0b0c0e;
  --panel: #16181c;
  --panel-2: #1f2228;
  --fg: #f2f4f7;
  --muted: #9aa2ad;
  --accent: #4c8dff;
  --error: #ff6b6b;
  --line: rgba(255, 255, 255, 0.5);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
}

#stage {
  position: fixed;
  inset: 0;
  overflow: hidden;
}

#view {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none; /* let us handle drag gestures ourselves */
  cursor: grab;
}
#view:active {
  cursor: grabbing;
}

#stage.dragover::after {
  content: "Drop to open";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 1.5rem;
  background: rgba(76, 141, 255, 0.15);
  border: 3px dashed var(--accent);
  pointer-events: none;
  z-index: 20;
}

/* -------------------------------------------------------------------------- */
/* Landing overlay                                                            */
/* -------------------------------------------------------------------------- */
#overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  background: radial-gradient(circle at 50% 30%, #1a1d22, #0b0c0e 70%);
  z-index: 15;
}
#overlay .panel {
  max-width: 30rem;
  text-align: center;
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 16px;
  padding: 2rem 1.75rem;
}
#overlay h1 {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
  letter-spacing: 0.01em;
}
#overlay p {
  margin: 0.5rem 0;
  color: var(--muted);
  line-height: 1.5;
}
#overlay code {
  background: var(--panel-2);
  padding: 0.1em 0.4em;
  border-radius: 6px;
  color: var(--fg);
}
.hint {
  font-size: 0.9rem;
}

/* -------------------------------------------------------------------------- */
/* Buttons                                                                    */
/* -------------------------------------------------------------------------- */
.button,
button {
  font: inherit;
  color: var(--fg);
  background: var(--panel-2);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  padding: 0.6rem 1rem;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.button:hover,
button:hover {
  background: #262a31;
}
.button {
  display: inline-block;
  margin-top: 0.75rem;
}
.button.small {
  margin-top: 0;
  padding: 0.5rem 0.85rem;
}
button[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* -------------------------------------------------------------------------- */
/* Control bar                                                                */
/* -------------------------------------------------------------------------- */
#controls {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
  z-index: 12;
}
#controls .group {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

/* -------------------------------------------------------------------------- */
/* Status line                                                                */
/* -------------------------------------------------------------------------- */
#status {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  right: 0.75rem;
  font-size: 0.85rem;
  color: var(--muted);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.8);
  pointer-events: none;
  z-index: 12;
}
#status.error {
  color: var(--error);
}

/* -------------------------------------------------------------------------- */
/* Cardboard stereo overlay                                                   */
/* -------------------------------------------------------------------------- */
#stereo-ui {
  position: absolute;
  inset: 0;
  z-index: 10;
  pointer-events: none;
}
#stereo-ui .divider {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  transform: translateX(-1px);
  background: rgba(0, 0, 0, 0.6);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.15);
}
/* Center alignment marker in each eye (crosshair). */
#stereo-ui .marker {
  position: absolute;
  top: 50%;
  width: 22px;
  height: 22px;
  transform: translate(-50%, -50%);
  opacity: 0.7;
}
#stereo-ui .marker::before,
#stereo-ui .marker::after {
  content: "";
  position: absolute;
  background: var(--line);
}
#stereo-ui .marker::before {
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  transform: translateX(-1px);
}
#stereo-ui .marker::after {
  top: 50%;
  left: 0;
  right: 0;
  height: 2px;
  transform: translateY(-1px);
}
#stereo-ui .marker-left {
  left: 25%;
}
#stereo-ui .marker-right {
  left: 75%;
}

/* -------------------------------------------------------------------------- */
/* Cardboard hint                                                             */
/* -------------------------------------------------------------------------- */
#cardboard-hint {
  position: absolute;
  left: 50%;
  bottom: 4.5rem;
  transform: translateX(-50%);
  z-index: 13;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: rgba(0, 0, 0, 0.55);
  border-radius: 12px;
  color: var(--fg);
  text-align: center;
  max-width: 22rem;
  pointer-events: none;
}
#cardboard-hint .goggles {
  color: var(--accent);
}
#cardboard-hint p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

/* On landscape phones, tuck the hint away so it does not block the view. */
@media (orientation: landscape) and (max-height: 500px) {
  #cardboard-hint {
    bottom: 0.5rem;
    font-size: 0.8rem;
  }
}

/* Landing overlay additions: visible open errors, privacy note, gallery link. */
.open-error {
  color: #ff8a8a;
  font-size: 0.95rem;
  margin: 0.75rem 0 0;
}
.privacy {
  color: #8e97a3;
  font-size: 0.85rem;
  margin: 0.9rem 0 0;
}
.back-link {
  color: #9db8e8;
}
a#home {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

/* File input is shown as styled labels; hide the native control but keep it
   reachable for keyboard, assistive tech, and iOS label-tap activation. */
#file {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}