/* Universal Scope - basic calculator. Big buttons, follows the look (soft / dark / high contrast). */
.uscalc { position: fixed; right: 1rem; bottom: 1rem; z-index: 50; width: 16rem; max-width: calc(100vw - 1.5rem);
  background: var(--paper); color: var(--ink); border: 2px solid var(--rule-strong); border-radius: 0.6rem;
  box-shadow: 0 6px 24px rgba(0,0,0,0.25); font-family: inherit; }
.uscalc[hidden] { display: none; }
.uscalc-bar { display: flex; align-items: center; justify-content: space-between; padding: 0.35rem 0.6rem;
  cursor: move; border-bottom: 1px solid var(--rule-strong); user-select: none; font-weight: 700; }
.uscalc-bar button { cursor: pointer; }
.uscalc-screen { margin: 0.5rem; padding: 0.4rem 0.6rem; background: var(--control); border: 1px solid var(--rule-strong);
  border-radius: 0.4rem; text-align: right; min-height: 3.2rem; overflow: hidden; }
.uscalc-expr { letter-spacing: 0.2em; font-size: 0.85rem; color: var(--soft-ink); min-height: 1.1rem; word-break: break-all; }
.uscalc-out { letter-spacing: 0.12em; font-size: 1.6rem; font-weight: 700; word-break: break-all; }
.uscalc-keys { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.4rem; padding: 0 0.5rem 0.5rem; }
.uscalc-keys button { font: inherit; font-size: 1.3rem; padding: 0.7rem 0; cursor: pointer; color: var(--ink);
  background: var(--control); border: 1px solid var(--rule-strong); border-radius: 0.4rem; }
.uscalc-keys button:hover { border-color: var(--focus); }
.uscalc-keys button:focus-visible, .uscalc-bar button:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.uscalc-keys .op { font-weight: 700; }
.uscalc-keys .eq { background: var(--pen); color: var(--paper); font-weight: 700; }
.uscalc-keys .wide { grid-column: span 2; }
.uscalc-past { max-height: 7.5rem; overflow-y: auto; font-size: 0.95rem; color: var(--soft-ink); border-bottom: 1px dashed var(--rule-strong); margin-bottom: 0.3rem; padding-bottom: 0.2rem; line-height: 1.5; }
.uscalc-past[hidden] { display: none; }
.uscalc-keys .small { font-size: 0.85rem; }