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

:root {
  --bg:        #0f1117;
  --surface:   #1c1f2e;
  --surface2:  #252840;
  --border:    #2e3250;
  --accent:    #6c63ff;
  --accent2:   #48cfad;
  --text:      #e8eaf0;
  --muted:     #7b80a0;
  --danger:    #ff6b6b;
  --warn:      #ffd166;
  --radius:    12px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg:        #f4f5f9;
    --surface:   #ffffff;
    --surface2:  #e8eaf0;
    --border:    #d0d4e8;
    --accent:    #5a52e0;
    --accent2:   #2daa8a;
    --text:      #1a1d2e;
    --muted:     #6b7094;
    --danger:    #d94f4f;
    --warn:      #c89400;
    --radius:    12px;
  }
}

/* ── Shared buttons ── */
.btn {
  padding: 0 1.1rem;
  border: none;
  border-radius: 8px;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .2s, transform .1s;
  height: 34px;
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
}
.btn:hover { opacity: .85; }
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-success { background: var(--accent2); color: var(--bg); }
.btn-danger  { background: var(--danger);  color: #fff; }
.btn-warn    { background: var(--warn);    color: var(--bg); }
.btn:disabled { opacity: .35; cursor: default; }

.version-tag {
  position: fixed;
  bottom: .3rem;
  right: .4rem;
  font-size: .7rem;
  color: var(--muted);
  opacity: .45;
  pointer-events: none;
  z-index: 1;
  letter-spacing: .02em;
}