/* ==========================================================================
   Archivio 3D — Pierpaolo Villano (@PierVillain)
   Aesthetic: Dark Neon Sobrio Creator · UI Overlay & Controls
   ========================================================================== */

:root {
  --bg-main: #07080d;
  --bg-hud: rgba(14, 16, 24, 0.75);
  --bg-card: rgba(18, 21, 33, 0.85);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-active: rgba(255, 255, 255, 0.22);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --neon-cyan: #00f5d4;
  --neon-cyan-glow: rgba(0, 245, 212, 0.25);
  --neon-purple: #b388ff;
  --neon-purple-glow: rgba(179, 136, 255, 0.25);
  --neon-amber: #ffb703;
  --neon-amber-glow: rgba(255, 183, 3, 0.25);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  height: 100dvh; /* viewport dinamica mobile: l'HUD non finisce sotto la barra del browser */
  overflow: hidden;
  overscroll-behavior: none;           /* no rubber-band / pull-to-refresh */
  -webkit-overflow-scrolling: none;     /* legacy iOS paranoia */
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 3D Canvas */
#webgl-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  outline: none;
  cursor: grab;
}

#webgl-canvas:active {
  cursor: grabbing;
}

/* UI Overlay Container (pointer-events: none, children opt-in) */

/* Soft vignette — depth without blocking interaction */
.ui-overlay::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(ellipse at center, transparent 42%, rgba(4, 6, 12, 0.55) 100%);
}

.ui-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* Interactive elements opt-in */
.ui-interactive {
  pointer-events: auto;
}

/* Top Banner (BOZZA) */
.draft-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1.25rem;
  background: rgba(7, 8, 13, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  z-index: 20;
}

.draft-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: rgba(255, 183, 3, 0.12);
  color: var(--neon-amber);
  border: 1px solid rgba(255, 183, 3, 0.35);
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  box-shadow: 0 0 12px rgba(255, 183, 3, 0.15);
}

.pulsing-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--neon-amber);
  box-shadow: 0 0 8px var(--neon-amber);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.top-bar-title {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.85rem;
}

.top-bar-title strong {
  color: #ffffff;
}

.btn-back-blog {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: #ffffff;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-back-blog:hover {
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
  box-shadow: 0 0 14px var(--neon-cyan-glow);
  background: rgba(0, 245, 212, 0.08);
}

.top-bar-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.lang-switch-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  line-height: 1;
}

.lang-switch-btn:hover {
  border-color: var(--neon-cyan);
  color: var(--text-primary);
  box-shadow: 0 0 10px rgba(0, 245, 212, 0.2);
}

.lang-badge {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.lang-badge.is-active {
  color: var(--neon-cyan);
  font-weight: 700;
  text-shadow: 0 0 8px var(--neon-cyan-glow);
}

.lang-sep {
  opacity: 0.35;
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* Header Info in Scene (Top Left) */
.scene-header {
  padding: 1.5rem 1.75rem;
  max-width: 480px;
}

.scene-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--neon-cyan);
  background: rgba(0, 245, 212, 0.08);
  border: 1px solid rgba(0, 245, 212, 0.25);
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  margin-bottom: 0.6rem;
  box-shadow: 0 0 12px var(--neon-cyan-glow);
}

.scene-title {
  font-size: clamp(1.4rem, 2.5vw, 1.9rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: #ffffff;
  line-height: 1.15;
  margin-bottom: 0.3rem;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.6);
}

.scene-author {
  font-size: 0.92rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.scene-author .handle {
  font-family: var(--font-mono);
  color: var(--neon-purple);
  font-weight: 600;
}

/* Exploration Hint Pill */
.explore-hint {
  position: absolute;
  top: 5rem;
  right: 1.5rem;
  background: rgba(14, 16, 24, 0.7);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-subtle);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  transition: opacity 0.5s ease;
}

.explore-hint svg {
  width: 14px;
  height: 14px;
  color: var(--neon-cyan);
}

/* Bottom HUD: Pillar Selector Navigation */
.bottom-hud {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  z-index: 20;
  touch-action: none;
}

.pillar-nav-bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: rgba(14, 16, 24, 0.85);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: 999px;
  padding: 0.35rem 0.5rem;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.6);
  touch-action: none;
}

.hud-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  padding: 0.45rem 1rem;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  transition: all var(--transition-fast);
}

.hud-btn .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: currentColor;
}

.hud-btn:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.05);
}

.hud-btn.active {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-active);
}

.hud-btn.btn-corpo:hover, .hud-btn.btn-corpo.active {
  color: var(--neon-cyan);
  border-color: rgba(0, 245, 212, 0.4);
  box-shadow: 0 0 14px var(--neon-cyan-glow);
}

.hud-btn.btn-mente:hover, .hud-btn.btn-mente.active {
  color: var(--neon-purple);
  border-color: rgba(179, 136, 255, 0.4);
  box-shadow: 0 0 14px var(--neon-purple-glow);
}

.hud-btn.btn-sistemi:hover, .hud-btn.btn-sistemi.active {
  color: var(--neon-amber);
  border-color: rgba(255, 183, 3, 0.4);
  box-shadow: 0 0 14px var(--neon-amber-glow);
}

.hud-footer-note {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* --------------------------------------------------------------------------
   Audio Anchor — bottone play al centro dei tre pilastri
   -------------------------------------------------------------------------- */
.audio-anchor {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 16;
  pointer-events: none;
  will-change: transform;
}

.audio-play-btn {
  position: absolute;
  top: 0;
  left: 0;
  transform: translate(-50%, -50%);
  width: 64px;
  height: 64px;
  border-radius: 50%;
  pointer-events: auto;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10, 12, 20, 0.72);
  border: 1px solid rgba(255, 183, 3, 0.45);
  color: var(--neon-amber);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 0 22px rgba(255, 183, 3, 0.22), 0 8px 30px rgba(0, 0, 0, 0.55);
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.audio-play-btn:hover,
.audio-play-btn:focus-visible {
  transform: translate(-50%, -50%) scale(1.08);
  border-color: var(--neon-amber);
  background: rgba(16, 18, 28, 0.85);
  box-shadow: 0 0 32px rgba(255, 183, 3, 0.4), 0 10px 34px rgba(0, 0, 0, 0.6);
}

.audio-play-btn svg {
  width: 26px;
  height: 26px;
}

.audio-play-btn .icon-pause {
  display: none;
}

.audio-play-btn.playing {
  color: var(--neon-amber);
  border-color: var(--neon-amber);
}

.audio-play-btn.playing .icon-play {
  display: none;
}

.audio-play-btn.playing .icon-pause {
  display: block;
}

.audio-play-btn.playing::after {
  content: "";
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  border: 1px solid rgba(255, 183, 3, 0.4);
  animation: audioPulse 2s ease-out infinite;
  pointer-events: none;
}

@keyframes audioPulse {
  0% { transform: scale(0.85); opacity: 0.9; }
  100% { transform: scale(1.55); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .audio-play-btn.playing::after {
    animation: none;
  }
}

@media (max-width: 640px) {
  .audio-play-btn {
    width: 56px;
    height: 56px;
  }
  .audio-play-btn svg {
    width: 22px;
    height: 22px;
  }
}

/* Pillar Detail Modal / Glassmorphic Card */
.pillar-modal {
  position: absolute;
  top: 50%;
  right: 2rem;
  transform: translateY(-50%) translateX(30px);
  width: min(390px, calc(100vw - 2.5rem));
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.35s ease, transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.35s;
  z-index: 30;
}

.pillar-modal:not(.active) {
  visibility: hidden;
  pointer-events: none !important;
}
.pillar-modal.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(-50%) translateX(0);
}

.modal-close-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

.modal-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  margin-bottom: 0.85rem;
}

.modal-title {
  font-size: 1.6rem;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.02em;
  margin-bottom: 0.35rem;
}

.modal-tagline {
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.modal-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.modal-topics {
  list-style: none;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-subtle);
  margin-bottom: 1.5rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.modal-topics li {
  position: relative;
  padding-left: 1.1rem;
}

.modal-topics li::before {
  content: "›";
  position: absolute;
  left: 0;
  font-weight: 700;
}

.modal-actions {
  display: flex;
  gap: 0.75rem;
}

.btn-modal-primary {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  color: #07080d;
  background: var(--neon-cyan);
  box-shadow: 0 0 16px var(--neon-cyan-glow);
  transition: all var(--transition-fast);
}

.btn-modal-primary:hover {
  transform: translateY(-1px);
  filter: brightness(1.1);
  box-shadow: 0 0 24px var(--neon-cyan-glow);
}

.btn-modal-reset {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-modal-reset:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
}

/* Modal Themes by Pillar */
.pillar-modal.theme-corpo {
  border-color: rgba(0, 245, 212, 0.35);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8), 0 0 30px var(--neon-cyan-glow);
}
.pillar-modal.theme-corpo .modal-badge {
  background: rgba(0, 245, 212, 0.12);
  color: var(--neon-cyan);
  border: 1px solid rgba(0, 245, 212, 0.3);
}
.pillar-modal.theme-corpo .modal-tagline {
  color: var(--neon-cyan);
}
.pillar-modal.theme-corpo .modal-topics li::before {
  color: var(--neon-cyan);
}
.pillar-modal.theme-corpo .btn-modal-primary {
  background: var(--neon-cyan);
  color: #07080d;
  box-shadow: 0 0 18px var(--neon-cyan-glow);
}

.pillar-modal.theme-mente {
  border-color: rgba(179, 136, 255, 0.35);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8), 0 0 30px var(--neon-purple-glow);
}
.pillar-modal.theme-mente .modal-badge {
  background: rgba(179, 136, 255, 0.12);
  color: var(--neon-purple);
  border: 1px solid rgba(179, 136, 255, 0.3);
}
.pillar-modal.theme-mente .modal-tagline {
  color: var(--neon-purple);
}
.pillar-modal.theme-mente .modal-topics li::before {
  color: var(--neon-purple);
}
.pillar-modal.theme-mente .btn-modal-primary {
  background: var(--neon-purple);
  color: #07080d;
  box-shadow: 0 0 18px var(--neon-purple-glow);
}

.pillar-modal.theme-sistemi {
  border-color: rgba(255, 183, 3, 0.35);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8), 0 0 30px var(--neon-amber-glow);
}
.pillar-modal.theme-sistemi .modal-badge {
  background: rgba(255, 183, 3, 0.12);
  color: var(--neon-amber);
  border: 1px solid rgba(255, 183, 3, 0.3);
}
.pillar-modal.theme-sistemi .modal-tagline {
  color: var(--neon-amber);
}
.pillar-modal.theme-sistemi .modal-topics li::before {
  color: var(--neon-amber);
}
.pillar-modal.theme-sistemi .btn-modal-primary {
  background: var(--neon-amber);
  color: #07080d;
  box-shadow: 0 0 18px var(--neon-amber-glow);
}

/* Floating 3D Label Tooltip on Hover */
#hover-tooltip {
  position: absolute;
  pointer-events: none;
  background: rgba(10, 12, 18, 0.88);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-active);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  opacity: 0;
  transition: opacity 0.15s ease;
  z-index: 25;
  transform: translate(-50%, -130%);
}

#hover-tooltip.visible {
  opacity: 1;
}

#hover-tooltip .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

/* WebGL Fallback Card */
.webgl-fallback {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: 480px;
  width: 90%;
  background: var(--bg-card);
  border: 1px solid rgba(255, 183, 3, 0.3);
  border-radius: var(--radius-lg);
  padding: 2.2rem;
  text-align: center;
  z-index: 100;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
}

.webgl-fallback h2 {
  font-size: 1.4rem;
  margin-bottom: 0.8rem;
  color: #ffffff;
}

.webgl-fallback p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

/* --------------------------------------------------------------------------
   Floating 3D Pillar Labels
   -------------------------------------------------------------------------- */
.pillar-floating-labels {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 15;
  transition: opacity 0.3s ease;
}

.pillar-floating-labels.modal-open {
  opacity: 0.15;
  pointer-events: none;
}

.floating-pillar-tag {
  position: absolute;
  top: 0;
  left: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  background: rgba(10, 12, 18, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #ffffff;
  cursor: pointer;
  pointer-events: auto;
  user-select: none;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
  transition: transform 0.1s ease-out, border-color 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
  will-change: transform;
  transform: translate(-50%, -50%);
}

.floating-pillar-tag .tag-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: currentColor;
}

.floating-pillar-tag.tag-corpo {
  color: var(--neon-cyan);
  border-color: rgba(0, 245, 212, 0.3);
}
.floating-pillar-tag.tag-corpo:hover {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 14px var(--neon-cyan-glow);
  transform: translate(-50%, -50%) scale(1.08) !important;
}

.floating-pillar-tag.tag-mente {
  color: var(--neon-purple);
  border-color: rgba(179, 136, 255, 0.3);
}
.floating-pillar-tag.tag-mente:hover {
  border-color: var(--neon-purple);
  box-shadow: 0 0 14px var(--neon-purple-glow);
  transform: translate(-50%, -50%) scale(1.08) !important;
}

.floating-pillar-tag.tag-sistemi {
  color: var(--neon-amber);
  border-color: rgba(255, 183, 3, 0.3);
}
.floating-pillar-tag.tag-sistemi:hover {
  border-color: var(--neon-amber);
  box-shadow: 0 0 14px var(--neon-amber-glow);
  transform: translate(-50%, -50%) scale(1.08) !important;
}

/* Mobile Responsiveness — UI mobile dedicata (demo-friendly) */
@media (max-width: 768px) {
  /* Top bar compatta: pill + back (il titolo c'è già nella scene header) */
  .draft-top-bar {
    padding: 0.5rem 0.9rem;
    gap: 0.5rem;
  }
  .draft-pill {
    font-size: 0.62rem;
    padding: 0.18rem 0.5rem;
    white-space: nowrap;
  }
  .top-bar-title {
    display: none;
  }
  .btn-back-blog {
    padding: 0.35rem 0.65rem;
    font-size: 0.78rem;
    white-space: nowrap;
  }

  /* Scene header più compatto */
  .scene-header {
    padding: 0.9rem 1.1rem;
  }
  .scene-tag {
    font-size: 0.6rem;
    letter-spacing: 0.14em;
  }
  .scene-title {
    font-size: 1.28rem;
  }
  .scene-author {
    font-size: 0.8rem;
  }

  /* Hint: pillola centrata sopra l'HUD, svanisce da sola (.hint-hidden via JS) */
  .explore-hint {
    top: auto;
    bottom: 7.8rem;
    right: 50%;
    transform: translateX(50%);
    white-space: nowrap;
    font-size: 0.7rem;
    padding: 0.4rem 0.8rem;
  }
  .explore-hint.hint-hidden {
    opacity: 0;
    visibility: hidden;
  }

  /* Etichette fluttuanti più compatte */
  .floating-pillar-tag {
    padding: 0.22rem 0.5rem;
    font-size: 0.6rem;
    gap: 0.3rem;
  }

  /* HUD bottom: barra segmentata full-width, target ≥ 44px, safe-area */
  .bottom-hud {
    width: 100%;
    padding: 0.6rem 0.9rem calc(0.7rem + env(safe-area-inset-bottom));
    background: linear-gradient(180deg, rgba(7, 8, 13, 0) 0%, rgba(7, 8, 13, 0.88) 46%);
  }
  .pillar-nav-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.3rem;
    width: 100%;
    padding: 0.35rem;
    border-radius: 16px;
  }
  .hud-btn {
    flex-direction: column;
    justify-content: center;
    gap: 0.28rem;
    width: 100%;
    min-height: 46px;
    padding: 0.45rem 0.2rem;
    font-size: 0.68rem;
    border-radius: 12px;
  }
  .hud-btn .dot {
    width: 6px;
    height: 6px;
  }
  .hud-footer-note {
    display: none;
  }

  /* Modale → bottom sheet nativa */
  .pillar-modal {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    max-height: 60vh;
    max-height: 58dvh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: 18px 18px 0 0;
    border-left: none;
    border-right: none;
    border-bottom: none;
    padding: 1.6rem 1.25rem calc(1.3rem + env(safe-area-inset-bottom));
    transform: translateY(105%);
  }
  .pillar-modal::before {
    content: "";
    position: absolute;
    top: 9px;
    left: 50%;
    transform: translateX(-50%);
    width: 46px;
    height: 4px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.22);
  }
  .pillar-modal:not(.active) {
    visibility: hidden;
    pointer-events: none !important;
  }
  .pillar-modal.active {
    transform: translateY(0);
  }
  .modal-close-btn {
    width: 38px;
    height: 38px;
  }
  .modal-title {
    font-size: 1.35rem;
  }
  .modal-actions {
    flex-direction: column;
    gap: 0.6rem;
  }
  .modal-actions .btn-modal-primary,
  .modal-actions .btn-modal-reset {
    width: 100%;
    justify-content: center;
  }
}

/* --------------------------------------------------------------------------
   Loading Screen Overlay (Pass 3)
   -------------------------------------------------------------------------- */
.loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #07080d;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  z-index: 200;
  opacity: 1;
  visibility: visible;
  transition: opacity 0.4s ease, visibility 0.4s ease;
}

.loading-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loading-spinner {
  width: 46px;
  height: 46px;
  border: 3px solid rgba(255, 255, 255, 0.08);
  border-top-color: var(--neon-cyan);
  border-radius: 50%;
  animation: spin 0.85s linear infinite;
  box-shadow: 0 0 18px var(--neon-cyan-glow);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.06em;
}

.loading-subtext {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-sans);
}

/* --------------------------------------------------------------------------
   Accessibility Focus Outlines
   -------------------------------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--neon-cyan);
  outline-offset: 3px;
}

.hud-btn:focus-visible,
.btn-back-blog:focus-visible,
.modal-close-btn:focus-visible,
.btn-modal-primary:focus-visible,
.btn-modal-reset:focus-visible,
.floating-pillar-tag:focus-visible {
  outline: 2px solid var(--neon-cyan);
  outline-offset: 2px;
}