/* ---------- Botões ---------- */
.m-btn {
  display: flex; align-items: center; justify-content: center; gap: 8px; width: 100%;
  background: var(--brand); color: #fff; border: none; border-radius: 12px;
  padding: 14px 18px; font-size: 15px; font-weight: 600; letter-spacing: -.01em; cursor: pointer; text-decoration: none;
  box-shadow: 0 6px 16px var(--brand-glow); transition: background .15s, transform .15s, box-shadow .15s;
}
.m-btn:hover { background: var(--brand-dark); }
.m-btn:active { transform: translateY(1px); }
.m-btn:disabled { background: var(--disabled-bg); color: var(--disabled-tx); cursor: not-allowed; box-shadow: none; }
.m-btn.ghost { background: var(--surface); color: var(--ink-strong); border: 1px solid var(--line); box-shadow: none; margin-top: 10px; }
.m-btn.ghost:hover { background: var(--soft); }
.m-btn-sm {
  display: inline-flex; align-items: center; gap: 7px; height: 40px; padding: 0 14px;
  background: var(--surface); color: var(--ink-strong); border: 1px solid var(--line); border-radius: 12px;
  font-size: 14px; font-weight: 600; cursor: pointer; transition: background .15s, border-color .15s;
}
.m-btn-sm:hover { background: var(--soft); border-color: var(--line2); }
.m-round {
  width: 40px; height: 40px; border-radius: 12px; border: 1px solid var(--line); background: var(--surface);
  color: var(--ink-strong); cursor: pointer; display: grid; place-items: center; transition: background .15s, border-color .15s;
}
.m-round:hover { background: var(--soft); border-color: var(--line2); }
/* Troca suave de tema e giro do ícone sol/lua */
.m-body { transition: background-color .25s ease, color .25s ease; }
@media (prefers-reduced-motion: no-preference) {
  .m-theme-btn.spin svg { animation: m-theme-spin 420ms cubic-bezier(.16, 1, .3, 1); }
}
@keyframes m-theme-spin { from { opacity: 0; transform: rotate(-90deg) scale(.6); } to { opacity: 1; transform: none; } }
.m-link { background: none; border: none; color: var(--brand); font-weight: 600; font-size: 14px; cursor: pointer; padding: 0; }
.m-link:hover { text-decoration: underline; }