/* GPU Server Tour – full-screen image, strip carousel, bottom nav */

/* ---------------------------------------------------------------------------
   Base layout and typography
   --------------------------------------------------------------------------- */
:root {
  --color-surface: #252530;
  --color-text: #e8e8ed;
  --color-text-muted: #9898a6;
  --color-text-on-light: #1a1a1a;
  --color-accent: #4a9eff;
  --color-hotspot-border: rgba(74, 158, 255, 0.8);
  --color-hotspot-active: rgba(74, 158, 255, 0.25);
  --color-popup-bg: #2a2a36;
  --color-popup-title: #f0f0f6;
  --color-backdrop: rgba(0, 0, 0, 0.6);
  --color-body-bg: #1a1520;
  --color-body-text: #333;
  --radius: 8px;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  --strip-thumb-size: 56px;
  --nav-btn-size: 48px;
}

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

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family:
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    sans-serif;
  color: var(--color-body-text);
  line-height: 1.5;
}

body {
  background: var(--color-body-bg);
  background-image: url("images/background.png");
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  background-repeat: no-repeat;
}

.tour {
  height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 0;
}

/* ---------------------------------------------------------------------------
   Viewer and image sizing
   --------------------------------------------------------------------------- */
.viewer {
  flex: 1;
  min-height: 0;
  position: relative;
}

.viewer-image-wrap {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: visible;
}

.viewer-image-inner {
  position: relative;
  flex-shrink: 0;
  max-width: 100%;
  max-height: 100%;
  border: 2px solid rgba(255, 255, 255, 0.6);
  border-radius: 6px;
  overflow: hidden;
  box-shadow:
    0 0 0 2px rgba(0, 0, 0, 0.6),
    0 0 40px rgba(0, 0, 0, 0.8),
    0 0 80px rgba(0, 0, 0, 0.6),
    0 0 120px rgba(0, 0, 0, 0.4),
    inset 0 0 50px rgba(0, 0, 0, 0.2);
}

.viewer-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  vertical-align: middle;
}

/* Empty state or image load error messages (app.js injects these) */
.viewer-message,
.viewer-image-fallback {
  color: var(--color-text);
  padding: 1.5rem;
  text-align: center;
  margin: 0;
}

.viewer-image-fallback {
  display: none;
}

/* Fade overlay for image/slide transitions */
.viewer-fade-overlay {
  position: absolute;
  inset: 0;
  z-index: 10;
  background: #000;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.125s ease;
}

/* ---------------------------------------------------------------------------
   Hotspot overlay and states
   --------------------------------------------------------------------------- */
.hotspot-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hotspot-layer .hotspot-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: auto;
}

.hotspot-region {
  cursor: pointer;
  outline: none;
}

.hotspot-region path {
  stroke: #f5d42e;
  stroke-width: 4;
  vector-effect: non-scaling-stroke;
  fill: transparent;
  filter: none;
  transition: filter 0.15s ease;
}

.hotspot-region:hover path,
.hotspot-region.hover path {
  filter: drop-shadow(0 0 0.5px #fff) drop-shadow(0 0 1px #fff)
    drop-shadow(0 0 1.5px #fff);
}

.hotspot-region.active path {
  filter: drop-shadow(0 0 0.5px #fff) drop-shadow(0 0 1px #fff)
    drop-shadow(0 0 1.5px #fff);
}

.hotspot-region:focus path {
  filter: drop-shadow(0 0 0.5px #fff) drop-shadow(0 0 1px #fff);
}

/* ---------------------------------------------------------------------------
   Thumbnails strip
   --------------------------------------------------------------------------- */
.bottom-nav {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: transparent;
  padding: 0.5rem 0 0.75rem;
  gap: 0.5rem;
}

.strip-wrap {
  width: 100%;
  overflow-x: auto;
  overflow-y: visible;
  display: flex;
  justify-content: center;
  padding: 0.5rem 0.25rem;
  -webkit-overflow-scrolling: touch;
}

.strip-wrap::-webkit-scrollbar {
  height: 4px;
}

.strip-wrap::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 2px;
}

.image-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.35rem 0;
  min-width: min-content;
}

.strip-item {
  flex-shrink: 0;
  width: var(--strip-thumb-size);
  height: var(--strip-thumb-size);
  padding: 0;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-radius: 6px;
  overflow: hidden;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.95);
  box-shadow:
    0 0 12px rgba(255, 255, 255, 0.4),
    0 0 24px rgba(255, 255, 255, 0.2);
  transition:
    transform 0.25s ease,
    box-shadow 0.2s ease,
    border-color 0.2s ease;
}

.strip-item img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  pointer-events: none;
}

.strip-item:hover {
  border-color: rgba(255, 255, 255, 0.9);
  box-shadow:
    0 0 16px rgba(255, 255, 255, 0.5),
    0 0 32px rgba(255, 255, 255, 0.3);
}

.strip-item:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.strip-item.strip-center {
  transform: scale(1.2);
  border-color: rgba(255, 255, 255, 0.7);
  box-shadow:
    0 0 16px rgba(255, 255, 255, 0.5),
    0 0 32px rgba(255, 255, 255, 0.25);
}

.nav-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
}

.nav-btn {
  width: var(--nav-btn-size);
  height: var(--nav-btn-size);
  padding: 0;
  font-size: 2rem;
  line-height: 1;
  font-family: inherit;
  color: var(--color-text-on-light);
  background: rgba(255, 255, 255, 0.95);
  border: 2px solid rgba(255, 255, 255, 0.6);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow:
    0 0 12px rgba(255, 255, 255, 0.4),
    0 0 24px rgba(255, 255, 255, 0.2);
  transition:
    background 0.15s,
    border-color 0.15s,
    box-shadow 0.15s;
}

.nav-btn:hover {
  background: #fff;
  border-color: rgba(255, 255, 255, 0.9);
  box-shadow:
    0 0 16px rgba(255, 255, 255, 0.5),
    0 0 32px rgba(255, 255, 255, 0.3);
}

.nav-btn:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.nav-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.nav-btn.nav-auto-tour {
  width: auto;
  min-width: var(--nav-btn-size);
  padding: 0 1rem;
  border-radius: 24px;
}

/* ---------------------------------------------------------------------------
   Popup
   --------------------------------------------------------------------------- */
.popup {
  position: fixed;
  z-index: 100;
  padding: 0;
  pointer-events: none;
}

.popup[hidden] {
  display: none;
}

.popup-content {
  pointer-events: auto;
  max-width: 380px;
  max-height: 90vh;
  overflow-y: auto;
  background: var(--color-popup-bg);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 1.25rem 1.5rem;
}

.popup-title {
  margin: 0 0 0.5rem 0;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-popup-title);
}

.popup-body {
  font-size: 0.95rem;
  color: var(--color-text);
}

.popup-body p {
  margin: 0 0 0.75rem;
}

.popup-body p:last-child {
  margin-bottom: 0;
}

.popup-body strong {
  color: var(--color-text);
}

/* ---------------------------------------------------------------------------
   Responsive and touch
   --------------------------------------------------------------------------- */
@media (max-width: 640px) {
  :root {
    --strip-thumb-size: 44px;
    --nav-btn-size: 44px;
  }

  .nav-btn {
    font-size: 1.75rem;
  }

  .strip-item {
    padding: 2px;
  }

  .popup-content {
    max-width: min(380px, calc(100vw - 1.5rem));
    padding: 1.25rem;
  }
}