* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

/* NỀN SÁNG VÀ MÀU SẮC THEME CHỐNG SỐC SHOPEE */
html, body {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  touch-action: none;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  transition: background-color 0.3s ease;
}

body.theme-pink {
  --theme-accent: #f43f5e;
  --theme-accent-soft: rgba(244, 63, 94, 0.12);
  --theme-accent-glow: rgba(244, 63, 94, 0.35);
  background-color: #fff0f3;
  background-image: radial-gradient(circle at 50% 25%, #ffffff 0%, #ffe4ea 55%, #fecdd6 100%);
}

body.theme-blue {
  --theme-accent: #0284c7;
  --theme-accent-soft: rgba(2, 132, 199, 0.12);
  --theme-accent-glow: rgba(2, 132, 199, 0.35);
  background-color: #f0f9ff;
  background-image: radial-gradient(circle at 50% 25%, #ffffff 0%, #e0f2fe 55%, #bae6fd 100%);
}

body.theme-mint {
  --theme-accent: #10b981;
  --theme-accent-soft: rgba(16, 185, 129, 0.12);
  --theme-accent-glow: rgba(16, 185, 129, 0.35);
  background-color: #f0fdf4;
  background-image: radial-gradient(circle at 50% 25%, #ffffff 0%, #dcfce7 55%, #bbf7d0 100%);
}

body.theme-purple {
  --theme-accent: #9333ea;
  --theme-accent-soft: rgba(147, 51, 234, 0.12);
  --theme-accent-glow: rgba(147, 51, 234, 0.35);
  background-color: #faf5ff;
  background-image: radial-gradient(circle at 50% 25%, #ffffff 0%, #f3e8ff 55%, #e9d5ff 100%);
}

body.theme-crystal {
  --theme-accent: #475569;
  --theme-accent-soft: rgba(71, 85, 105, 0.12);
  --theme-accent-glow: rgba(71, 85, 105, 0.35);
  background-color: #f8fafc;
  background-image: radial-gradient(circle at 50% 25%, #ffffff 0%, #f1f5f9 55%, #e2e8f0 100%);
}

#bubbleCanvas {
  display: block;
  width: 100vw;
  height: 100vh;
  cursor: grab;
}

#bubbleCanvas:active,
body.is-panning #bubbleCanvas {
  cursor: grabbing !important;
}

/* BẢNG CHỌN MÀU NỀN TỐI GIẢN (FLOATING THEME SELECTOR) */
.palette-bar {
  position: fixed;
  bottom: 14px;
  left: 18px;
  z-index: 999;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.95);
  border-radius: 999px;
  box-shadow: 0 4px 18px rgba(15, 23, 42, 0.09);
  touch-action: auto;
}

.palette-btn {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid #ffffff;
  background-color: var(--color-dot);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.18);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  outline: none;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

.palette-btn:hover {
  transform: scale(1.18);
}

.palette-btn:active {
  transform: scale(0.92);
}

.palette-btn.is-active {
  transform: scale(1.25);
  border-color: #0f172a;
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.95), 0 3px 8px rgba(0, 0, 0, 0.22);
}

/* THANH FOOTER NỔI TINH TẾ (FLOATING FOOTER CAPSULE) */
.app-footer {
  position: fixed;
  bottom: 14px;
  right: 18px;
  z-index: 999;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.95);
  border-radius: 999px;
  box-shadow: 0 4px 18px rgba(15, 23, 42, 0.08);
  touch-action: auto;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.footer-legal-btn {
  background: none;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 4px;
  font-family: inherit;
  font-size: 0.72rem;
  font-weight: 500;
  color: #64748b;
  cursor: pointer;
  transition: color 0.3s ease, transform 0.15s ease;
  outline: none;
  border-radius: 999px;
  -webkit-tap-highlight-color: transparent;
}

.footer-legal-btn:hover {
  color: var(--theme-accent);
}

.legal-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--theme-accent);
  box-shadow: 0 0 8px var(--theme-accent-glow);
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.footer-divider {
  color: #cbd5e1;
  font-size: 0.65rem;
  user-select: none;
}

.badge-author {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.72rem;
  font-weight: 500;
  color: #475569;
  text-decoration: none;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: color 0.25s ease;
}

.badge-author strong {
  font-weight: 700;
  color: #0f172a;
  transition: color 0.3s ease;
}

.badge-author:hover strong {
  color: var(--theme-accent);
}

/* MODAL ĐIỀU KHOẢN & BẢO MẬT */
.legal-modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: rgba(15, 23, 42, 0.35);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.legal-modal-backdrop.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.legal-modal-card {
  width: 100%;
  max-width: 440px;
  background: rgba(255, 255, 255, 0.98);
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 20px 45px -10px rgba(15, 23, 42, 0.22);
  padding: 22px 24px;
  transform: scale(0.94) translateY(8px);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  gap: 14px;
  touch-action: auto;
}

.legal-modal-backdrop.is-open .legal-modal-card {
  transform: scale(1) translateY(0);
}

.legal-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #f1f5f9;
  padding-bottom: 10px;
}

.legal-modal-title {
  display: flex;
  align-items: center;
  gap: 8px;
}

.legal-title-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--theme-accent);
  box-shadow: 0 0 10px var(--theme-accent-glow);
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.legal-modal-title h3 {
  font-size: 0.98rem;
  font-weight: 700;
  color: #0f172a;
}

.legal-close-btn {
  background: none;
  border: none;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  font-size: 0.9rem;
  color: #94a3b8;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

.legal-close-btn:hover {
  background: #f1f5f9;
  color: #0f172a;
}

.legal-modal-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.legal-item {
  background: #f8fafc;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid #f1f5f9;
}

.legal-item h4 {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--theme-accent);
  margin-bottom: 4px;
  transition: color 0.3s ease;
}

.legal-item p {
  font-size: 0.76rem;
  color: #475569;
  line-height: 1.5;
}

.legal-modal-footer {
  display: flex;
  justify-content: flex-end;
  padding-top: 4px;
}

.legal-confirm-btn {
  background-color: var(--theme-accent);
  color: #ffffff;
  border: none;
  padding: 7px 18px;
  border-radius: 999px;
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 14px var(--theme-accent-glow);
  transition: all 0.3s ease;
}

.legal-confirm-btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.08);
}

.legal-confirm-btn:active {
  transform: translateY(0);
}

@media (max-width: 640px) {
  .palette-bar {
    bottom: 12px;
    left: 12px;
    gap: 7px;
    padding: 5px 8px;
  }
  .palette-btn {
    width: 19px;
    height: 19px;
  }
  .app-footer {
    bottom: 12px;
    right: 12px;
    padding: 4px 10px;
    gap: 6px;
  }
  .footer-legal-btn, .badge-author {
    font-size: 0.66rem;
  }
  .legal-modal-card {
    padding: 18px 20px;
  }
}