#9 Display and positioning

/* Block: takes full width, starts on new line */
div, p, h1, section { display: block; }

/* Inline: flows with text, no width/height */
span, a, strong { display: inline; }

/* Inline-block: inline + allows width/height */
.badge {
  display: inline-block;
  padding: 4px 8px;
  border-radius: 4px;
}

/* None: completely hidden */
.hidden { display: none; }

/* Relative: offset from normal position */
.tooltip-trigger {
  position: relative;
}

/* Absolute: positioned relative to nearest positioned ancestor */
.tooltip {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
}

/* Fixed: stays in place during scroll */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
}

/* Sticky: sticks when scrolled past */
.table-header {
  position: sticky;
  top: 0;
  background: white;
}

.overlay {
  position: fixed;
  inset: 0;                    /* top/right/bottom/left: 0 */
  background: rgba(0,0,0,0.5);
  z-index: 50;
}

.modal {
  position: fixed;
  z-index: 51;                 /* Above overlay */
}